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WO2018196003A1 - Motor ventilation structure and motor - Google Patents

Motor ventilation structure and motor Download PDF

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Publication number
WO2018196003A1
WO2018196003A1 PCT/CN2017/082616 CN2017082616W WO2018196003A1 WO 2018196003 A1 WO2018196003 A1 WO 2018196003A1 CN 2017082616 W CN2017082616 W CN 2017082616W WO 2018196003 A1 WO2018196003 A1 WO 2018196003A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
air
drive end
cooling
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/082616
Other languages
French (fr)
Inventor
Zhiwei Jiang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to PCT/CN2017/082616 priority Critical patent/WO2018196003A1/en
Publication of WO2018196003A1 publication Critical patent/WO2018196003A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air

Definitions

  • the present invention relates to the field of motor technologies, and in particular, to a motor ventilation structure and a motor having the motor ventilation structure.
  • An axial-radial hybrid ventilation structure is usually used in many large motors, and an advantage of the structure lies in that good convective heat transfer between an end portion of a winding and a back of a stator core lowers a temperature rise of a motor.
  • an advantage of the structure lies in that good convective heat transfer between an end portion of a winding and a back of a stator core lowers a temperature rise of a motor.
  • a temperature difference between cooling air of a drive end of the motor and cooling air of a non-drive end of the motor is relatively large. Therefore, under the effect of a high temperature airflow of the drive end, a bearing temperature of the drive end usually exceeds a limit value.
  • an objective of the present invention is to provide a motor ventilation structure and a motor, thereby ensuring that a bearing of a drive end of the motor has an appropriate temperature and achieving relatively high heat dissipation efficiency.
  • the present invention provides a motor ventilation structure, where the motor ventilation structure is disposed inside a housing of a motor, the motor is provided with a drive end and a non-drive end opposite to the drive end, and the motor ventilation structure includes:
  • a first air baffle located on the drive end, where the first air baffle is spaced from a side wall of the housing of the motor, so as to form an accommodation space with the housing;
  • a ventilation pipe fixed on the first air baffle, where the ventilation pipe extends from the non-drive end of the motor to the drive end of the motor and is in communication with the accommodation space;
  • a double-suction fan fixedly sleeved on a rotation shaft of the motor and disposed on one side, close to the non-drive end, of the first air baffle, where the double-suction fan is configured to extract air from the non-drive end to the drive end, and extract air in the accommodation space and air for axial-radial cooling out of the housing of the motor.
  • the first air baffle is provided with a flat plate portion and an inclined plate portion; the inclined plate portion is disposed on an end portion of the flat plate portion and inclines relative to the flat plate portion; the inclined plate portion is disposed between the flat plate portion and the side wall of the housing of the motor.
  • the flat plate portion is provided thereon with an air inlet and a plurality of air vents, a part of the double-suction fan is disposed in the air inlet, and the ventilation pipe is in communication with a corresponding air vent.
  • the double-suction fan includes: a partition plate, fixedly sleeved on the rotation shaft of the motor, where the partition plate is provided with a first surface and a second surface opposite to the first surface, the first surface faces the non-drive end, and the second surface faces the drive end; a primary fan disk; a secondary fan disk; a plurality of primary fan blades, fixedly disposed between the first surface and the primary fan disk; and a plurality of secondary fan blades, fixedly disposed between the second surface and the secondary fan disk.
  • the length of the primary fan blade is greater than the length of the secondary fan blade along a direction parallel to the rotation shaft.
  • the double-suction fan is a centrifugal fan.
  • the present invention further provides a motor, and the motor includes any of the foregoing motor ventilation structures.
  • the motor further includes: a second air baffle, where the first air baffle and the second air baffle are respectively located on two sides of the double-suction fan.
  • the motor further includes: a cooling apparatus, and the cooling apparatus includes: a cooling cover, assembled on the housing of the motor and in communication with the housing; a plurality of cooling pipes, disposed in the cooling cover at intervals and in communication with the outside; and an external fan, fixedly sleeved on an end portion of the rotation shaft and located on the non-drive end of the motor, where the external fan is configured to extract outside air into the cooling pipe of the cooling cover.
  • the cooling apparatus includes: a cooling cover, assembled on the housing of the motor and in communication with the housing; a plurality of cooling pipes, disposed in the cooling cover at intervals and in communication with the outside; and an external fan, fixedly sleeved on an end portion of the rotation shaft and located on the non-drive end of the motor, where the external fan is configured to extract outside air into the cooling pipe of the cooling cover.
  • the motor further includes: a cooling apparatus, and the cooling apparatus includes: a cooling cover, assembled on the housing of the motor and in communication with the housing; and a water cooling core, disposed in the cooling cover.
  • a first air baffle is located on a drive end of the motor, and forms an accommodation space with a housing of the motor; a plurality of ventilation pipes extends from a non-drive end of the motor to the drive end of the motor and is in communication with the accommodation space; under the effect of a double-suction fan, two parts of circulation cooling air may be provided for inside of the motor; the cooling air of the non-drive end of the motor may flow into the accommodation space through the ventilation pipe so as to cool a bearing of the drive end of the motor, thereby ensuring that the bearing of the drive end of the motor has an appropriate temperature, without increasing an outer diameter of an inner fan and without causing excessive windage and friction loss of the motor, so that the motor may achieve relatively high heat dissipation efficiency.
  • FIG. 1 is a three-dimensional schematic diagram of a motor according to a first embodiment of the present invention
  • FIG. 2 is a three-dimensional schematic diagram of a motor ventilation structure of the motor shown in FIG. 1;
  • FIG. 3 is a three-dimensional schematic diagram of a double-suction fan of the motor ventilation structure shown in FIG. 2;
  • FIG. 4 is a schematic diagram of the operating principle of a motor according to a second embodiment of the present invention.
  • FIG. 5 is a schematic diagram of the operating principle of a motor according to a third embodiment of the present invention.
  • FIG. 1 is a three-dimensional schematic diagram of a motor according to a first embodiment of the present invention. It should be noted that for ease of description, FIG. 1 only shows some elements of the motor.
  • FIG. 2 is a three-dimensional schematic diagram of a motor ventilation structure of the motor shown in FIG. 1.
  • a motor 30 includes a motor ventilation structure 20; the motor ventilation structure 20 is disposed inside a housing 31 of the motor 30; the motor 30 is provided with a drive end 301 and a non-drive end 302 opposite to the drive end 301.
  • the motor ventilation structure 20 includes a first air baffle 21, a plurality of ventilation pipes 22, and a double-suction fan 23.
  • the first air baffle 21 is located on the drive end 301, and the first air baffle 21 is spaced from a side wall 311 of the housing 31 of the motor 30, so as to form an accommodation space 210 with the housing 31.
  • the ventilation pipes 22 are fixed on the first air baffle 21, and extend from the non-drive end 302 of the motor 30 to the drive end 301 of the motor 30, and are in communication with the accommodation space 210.
  • the double-suction fan 23 is fixedly sleeved on a rotation shaft 32 of the motor 30 and is disposed on one side, close to the non-drive end 302, of the first air baffle 21.
  • the double-suction fan 23 is configured to extract air from the non-drive end 302 to the drive end 301, and extract air in the accommodation space 210 and air for axial-radial cooling out of the housing 31 of the motor 30.
  • the first air baffle 21 is provided with a flat plate portion 211 and an inclined plate portion 212.
  • the inclined plate portion 212 is disposed on an end portion of the flat plate portion 211 and inclines relative to the flat plate portion 211.
  • the inclined plate portion 212 is disposed between the flat plate portion 211 and the side wall 311 of the housing 31 of the motor 30.
  • the flat plate portion 211 is provided thereon with an air inlet 213 and a plurality of air vents 214.
  • a part of the double-suction fan 23 is disposed in the air inlet 213, and the ventilation pipes 22 are in communication with corresponding air vents 214.
  • the ventilation pipe 22 has a hollow structure. In this embodiment, there are four ventilation pipes 22, and the four ventilation pipes 22 are arranged on the flat plate portion 211 of the first air baffle 21 at intervals.
  • the quantity of the ventilation pipe 22 is not limited to this embodiment, and may be arbitrarily set according to actual situations.
  • FIG. 3 is a three-dimensional schematic diagram of the double-suction fan of the motor ventilation structure shown in FIG. 2.
  • the double-suction fan 23 is fixed on the rotation shaft 32 and may rotate along with the rotation shaft 32.
  • the double-suction fan 23 includes a partition plate 231, a primary fan disk 234, a secondary fan disk 235, a plurality of primary fan blades 236, and a plurality of secondary fan blades 237.
  • the partition plate 231 is fixedly sleeved on the rotation shaft 32 of the motor 30.
  • the partition plate 231 is provided with a first surface 232 and a second surface 233 opposite to the first surface 232.
  • the first surface 232 faces the non-drive end 302, and the second surface 233 faces the drive end 301.
  • the plurality of primary fan blades 236 is fixed between the first surface 232 and the primary fan disk 234.
  • the plurality of secondary fan blades 237 is fixed between the second surface 233 and the secondary fan disk 235.
  • the double-suction fan 23 is a centrifugal fan.
  • the length of the primary fan blade 236 is greater than the length of the secondary fan blade 237 along a direction parallel to the rotation shaft 32.
  • the width of the primary fan blade 236 gradually decreases along a direction from the first surface 232 to the primary fan disk 234, and the width of secondary fan blade 237 gradually decreases along a direction from the second surface 233 to the secondary fan disk 235.
  • the motor 30 further includes a second air baffle 33 and a plurality of support plates 34.
  • the first air baffle 21 and the second air baffle 33 are respectively located on two sides of the double-suction fan 23. Specifically, a part of the primary fan disk 234 of the double-suction fan 23 is inserted into an air inlet of the second air baffle 33, and a part of the secondary fan disk 235 is inserted into an air inlet 213 of the first air baffle 21.
  • the structure of the second air baffle 33 is the same as the structure of the first air baffle 21, and details are not described herein again.
  • the first air baffle 21 is spaced from the second air baffle 33 back to back.
  • the second air baffle 33 and the inclined plate portion of the first air baffle 21 may perform the function of guiding air flowing from the housing 31 of the motor 30.
  • each support plate 34 is further provided thereon with a plurality of ventilation pipe installation holes (not labeled) and a plurality of air vents (not labeled) .
  • the ventilation pipes 22 may be inserted into the ventilation pipe installation holes, and cooling air may flow through the air vents.
  • cooling air inside a cooling apparatus outside the housing 31 of the motor 30 enters the housing 31 along a direction D1, and is divided into a first part of cooling air and a second part of cooling air.
  • the first part of cooling air flows through ventilation channels of the rotor core and the stator core of the motor 30, and flows along a direction D2, a direction D3, to a direction D4 after flowing out of the ventilation channels of the rotor core and the stator core.
  • the first part of cooling air becomes a first part of hot air.
  • the first part of hot air is extracted out of the housing 31 along a direction D5 under effects of the primary fan disk 234 and the primary fan blade 236 of the double-suction fan 23.
  • the second part of cooling air enters the ventilation pipe 22, flows through the ventilation pipe 22 from right to left, and then flows into the accommodation space 210 formed by the first air baffle 21 and the housing 31.
  • the second part of cooling air cools a bearing of the drive end of the motor 30 and becomes a second part of hot air. Then, the second part of hot air is extracted out of the housing 31 along a direction D6 under effects of the secondary fan disk 235 and the secondary fan blade 237 of the double-suction fan 23.
  • the type of the cooling apparatus outside the housing 31 of the motor 30 is not limited, and the structure and the operating principle of the cooling apparatus will be described in detail in a second embodiment and a third embodiment.
  • FIG. 4 is a schematic diagram of the operating principle of a motor according to a second embodiment of the present invention.
  • a motor 30 of the second embodiment is similar to the motor 30 of the first embodiment, and a difference lies in that the motor 30 of the second embodiment further includes a cooling apparatus 40.
  • the cooling apparatus 40 is an air-cooled cooling apparatus, and includes a cooling cover 41, a plurality of cooling pipes 42, and an external fan 43.
  • the cooling cover 41 is assembled on a housing 31 and is in communication with the housing 31.
  • the plurality of cooling pipes 42 is disposed in the cooling cover 41 at intervals and is in communication with the outside.
  • a rotation shaft 32 is assembled on the housing 31 and passes through the housing 31.
  • the external fan 43 is located on a non-drive end 302 of the motor 30, is fixedly sleeved on an end portion of the rotation shaft 32, and may rotate along with the rotation shaft 32.
  • the external fan 43 is configured to extract outside air into the cooling pipes 42 of the cooling cover 41, so that the cooling pipes 42 may cool hot air that enters the cooling cover 42.
  • the motor 30 of the second embodiment also includes a motor ventilation structure 20, and a ventilation pipe 22 of the motor ventilation structure 20 extends from the non-drive end 302 of the motor 30 to a drive end 301 of the motor 30.
  • the external fan 43 extracts the outside air into the cooling cover 41.
  • the outside air that enters the cooling cover 41 first flows along a direction D7, then flows through the cooling pipes 42 along a direction D8 from right to left, and is finally discharged from the cooling cover 41. Because the outside air is guided into the cooling pipes 42, heat exchange may be performed between the cooling pipes 42 and the hot air flowing from the housing 31 into the cooling cover 41. After the heat exchange, the hot air becomes cooling air.
  • the cooling air in the cooling cover 41 enters the housing 31 along a direction D1, and is divided into a first part of cooling air and a second part of cooling air.
  • the first part of cooling air flows through ventilation channels of a rotor core and a stator core of the motor 30, and flows along a direction D2, a direction D3, to a direction D4 after flowing out of the ventilation channels of the rotor core and the stator core.
  • the first part of cooling air becomes a first part of hot air.
  • the first part of hot air is extracted out of the housing 31 along a direction D5 under effects of a primary fan disk 234 and a primary fan blade 236 of a double-suction fan 23, and enters the cooling cover 41.
  • the second part of cooling air enters the ventilation pipe 22, flows through the ventilation pipe 22 from right to left, and then flows into an accommodation space 210 formed by a first air baffle 21 and the housing 31.
  • the second part of cooling air cools a bearing of the drive end of the motor 30 and becomes a second part of hot air.
  • the second part of hot air is extracted out of the housing 31 along a direction D6 under effects of a secondary fan disk 235 and a secondary fan blade 237 of the double-suction fan 23, and enters the cooling cover 41.
  • the hot air becomes cooling air after being cooled by the cooling apparatus 40, and the cooling air then enters the housing 31 along the direction D1. This cycle repeats.
  • FIG. 5 is a schematic diagram of the operating principle of a motor according to a third embodiment of the present invention.
  • a motor 30 of the third embodiment is similar to the motor 30 of the second embodiment, and a difference lies in that a cooling apparatus 50 of the motor 30 of the third embodiment is a water-cooled cooling apparatus, and includes a cooling cover 51 and a water-cooled core 52.
  • the cooling cover 51 is assembled on a housing 31 and is in communication with the housing 31.
  • the water-cooled core 52 is disposed in the cooling cover 51 and includes a plurality of water-cooled fins disposed at intervals. Each of the water-cooled fins is provided thereon with a cooling water pipe.
  • heat exchange may be performed between the hot air in the cooling cover 51 and cooling water in the water-cooled core 52, so that the hot air becomes cooling air after being cooled.
  • the cooling air in the cooling cover 51 enters the housing 31 along a direction D1, and is divided into a first part of cooling air and a second part of cooling air.
  • the first part of cooling air flows through ventilation channels of a rotor core and a stator core of the motor 30, and flows along a direction D2, a direction D3, to a direction D4 after flowing out of the ventilation channels of the rotor core and the stator core.
  • the first part of cooling air becomes a first part of hot air.
  • the first part of hot air is extracted out of the housing 31 along a direction D5 under effects of a primary fan disk 234 and a primary fan blade 236 of a double-suction fan 23, and enters a cooling cover 41.
  • the second part of cooling air enters a ventilation pipe 22, flows through the ventilation pipe 22 from right to left, and then flows into an accommodation space 210 formed by a first air baffle 21 and the housing 31.
  • the second part of cooling air cools a bearing of a drive end of the motor 30 and becomes a second part of hot air.
  • the second part of hot air is extracted out of the housing 31 along a direction D6 under effects of a secondary fan disk 235 and a secondary fan blade 237 of the double-suction fan 23, and enters the cooling cover 41.
  • the hot air that enters the cooling cover 41 flows through gaps of the water-cooled core 52 along a direction D9 from left to right, and heat exchange is performed between the hot air in the cooling cover 41 and the cooling water in the water-cooled core 52.
  • the hot air becomes cooling air, and then the cooling air enters the housing 31 along the direction D1. This cycle repeats.
  • the motor ventilation structure and the motor of the present invention have at least the following advantages:
  • a first air baffle is located on a drive end of the motor, and forms an accommodation space with a housing of the motor; a plurality of ventilation pipes extending from a non-drive end of the motor to the drive end of the motor and is in communication with the accommodation space; under the effect of a double-suction fan, two parts of circulation cooling air may be provided for inside of the motor; the cooling air of the non-drive end of the motor may flow into the accommodation space through the ventilation pipe so as to cool a bearing of the drive end of the motor, thereby ensuring that the bearing of the drive end of the motor has an appropriate temperature, without increasing an outer diameter of an inner fan and without causing excessive windage and friction loss of the motor, so that the motor may achieve relatively high heat dissipation efficiency;
  • the first air baffle is provided with a flat plate portion and an inclined plate portion; the inclined plate portion is disposed between the flat plate portion and a side wall of the housing of the motor, and the inclined plate portion is disposed so as to facilitate forming an accommodation space between the first air baffle and the housing of the motor.
  • the inclined plate portion may perform the function of guiding the air;
  • the double-suction fan includes a primary fan blade and a secondary fan blade; the length of the primary fan blade is greater than the length of the secondary fan blade along a direction parallel to a rotation shaft; the volume of air extracted by the primary fan blade is greater than the volume of air extracted by the secondary fan blade, so that the volume of air for cooling a rotor core and a stator of the motor and the volume of air for cooling a bearing of the drive end may be controlled;
  • the motor further includes a second air baffle, and the structure of the second air baffle is similar to the structure of the first air baffle; the second air baffle is spaced from the first air baffle back to back; the second air baffle and the inclined plate portion of the first air baffle may perform the function of guiding air flowing from the housing of the motor; and
  • the motor further includes an air-cooled cooling apparatus or a water-cooled cooling apparatus; this is determined according to actual requirements, so that the motor can be conveniently and flexibly applied.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

The motor ventilation structure (20) is disposed inside a housing (31) of the motor (30), and the motor (30) is provided with a drive end (301) and a non-drive end (302) opposite to the drive end. The motor ventilation structure (20) includes: a first air baffle (21), located on the drive end (301), where the first air baffle (21) is spaced from a side wall of the housing of the motor (30), so as to form an accommodation space (210) with the housing (31); a ventilation pipe (22), fixed on the first air baffle (21), where the ventilation pipe (22) extends from the non-drive end (302) of the motor (30) to the drive end (301) of the motor (30) and is in communication with the accommodation space (210); and a double-suction fan (23), fixedly sleeved on a rotation shaft (32) of the motor (30) and disposed on one side, close to the non-drive end (302), of the first air baffle (21), where the double-suction fan (23) is configured to extract air from the non-drive end (302) to the drive end (301), and extract air in the accommodation space (210) and air for axial-radial cooling out of the housing (31) of the motor (30). The motor ventilation structure (20) and the motor (30) may ensure that a bearing of the drive end of the motor (30) has an appropriate temperature, and may achieve relatively high heat dissipation efficiency.

Description

MOTOR VENTILATION STRUCTURE AND MOTOR BACKGROUND Technical Field
The present invention relates to the field of motor technologies, and in particular, to a motor ventilation structure and a motor having the motor ventilation structure.
Related Art
An axial-radial hybrid ventilation structure is usually used in many large motors, and an advantage of the structure lies in that good convective heat transfer between an end portion of a winding and a back of a stator core lowers a temperature rise of a motor. However, when the inner air volume is relatively small, a temperature difference between cooling air of a drive end of the motor and cooling air of a non-drive end of the motor is relatively large. Therefore, under the effect of a high temperature airflow of the drive end, a bearing temperature of the drive end usually exceeds a limit value.
In an existing axial-radial hybrid ventilation motor design, to ensure an appropriate bearing temperature, a method of increasing an outer diameter of an inner fan is usually adopted. However, this method may lead to excessive windage and friction loss of the motor and reduction of heat dissipation efficiency.
SUMMARY
In view of this, an objective of the present invention is to provide a motor ventilation structure and a motor, thereby ensuring that a bearing of a drive end of the motor has an appropriate temperature and achieving relatively high heat dissipation efficiency.
The present invention provides a motor ventilation structure, where the motor ventilation structure is disposed inside a housing of a motor, the motor is provided with a drive end and a non-drive end opposite to the drive end, and the motor ventilation structure includes:
a first air baffle, located on the drive end, where the first air baffle is spaced from a side wall of the housing of the motor, so as to form an accommodation space with the  housing；
a ventilation pipe, fixed on the first air baffle, where the ventilation pipe extends from the non-drive end of the motor to the drive end of the motor and is in communication with the accommodation space； and
a double-suction fan, fixedly sleeved on a rotation shaft of the motor and disposed on one side, close to the non-drive end, of the first air baffle, where the double-suction fan is configured to extract air from the non-drive end to the drive end, and extract air in the accommodation space and air for axial-radial cooling out of the housing of the motor.
In an exemplary embodiment of the motor ventilation structure, the first air baffle is provided with a flat plate portion and an inclined plate portion； the inclined plate portion is disposed on an end portion of the flat plate portion and inclines relative to the flat plate portion； the inclined plate portion is disposed between the flat plate portion and the side wall of the housing of the motor.
In an exemplary embodiment of the motor ventilation structure, the flat plate portion is provided thereon with an air inlet and a plurality of air vents, a part of the double-suction fan is disposed in the air inlet, and the ventilation pipe is in communication with a corresponding air vent.
In an exemplary embodiment of the motor ventilation structure, the double-suction fan includes: a partition plate, fixedly sleeved on the rotation shaft of the motor, where the partition plate is provided with a first surface and a second surface opposite to the first surface, the first surface faces the non-drive end, and the second surface faces the drive end； a primary fan disk； a secondary fan disk； a plurality of primary fan blades, fixedly disposed between the first surface and the primary fan disk； and a plurality of secondary fan blades, fixedly disposed between the second surface and the secondary fan disk.
In an exemplary embodiment of the motor ventilation structure, the length of the primary fan blade is greater than the length of the secondary fan blade along a direction parallel to the rotation shaft.
In an exemplary embodiment of the motor ventilation structure, the double-suction fan  is a centrifugal fan.
The present invention further provides a motor, and the motor includes any of the foregoing motor ventilation structures.
In an exemplary embodiment of the motor ventilation structure, the motor further includes: a second air baffle, where the first air baffle and the second air baffle are respectively located on two sides of the double-suction fan.
In an exemplary embodiment of the motor ventilation structure, the motor further includes: a cooling apparatus, and the cooling apparatus includes: a cooling cover, assembled on the housing of the motor and in communication with the housing； a plurality of cooling pipes, disposed in the cooling cover at intervals and in communication with the outside； and an external fan, fixedly sleeved on an end portion of the rotation shaft and located on the non-drive end of the motor, where the external fan is configured to extract outside air into the cooling pipe of the cooling cover.
In an exemplary embodiment of the motor ventilation structure, the motor further includes: a cooling apparatus, and the cooling apparatus includes: a cooling cover, assembled on the housing of the motor and in communication with the housing； and a water cooling core, disposed in the cooling cover.
It can be known from the foregoing solutions that in the motor ventilation structure and the motor of the present invention, a first air baffle is located on a drive end of the motor, and forms an accommodation space with a housing of the motor； a plurality of ventilation pipes extends from a non-drive end of the motor to the drive end of the motor and is in communication with the accommodation space； under the effect of a double-suction fan, two parts of circulation cooling air may be provided for inside of the motor； the cooling air of the non-drive end of the motor may flow into the accommodation space through the ventilation pipe so as to cool a bearing of the drive end of the motor, thereby ensuring that the bearing of the drive end of the motor has an appropriate temperature, without increasing an outer diameter of an inner fan and without causing excessive windage and friction loss of the motor, so that the motor may achieve relatively high heat dissipation efficiency.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features, characteristics, advantages, and benefits of the present invention are more obvious by means of detailed description with reference to the accompanying drawings.
FIG. 1 is a three-dimensional schematic diagram of a motor according to a first embodiment of the present invention；
FIG. 2 is a three-dimensional schematic diagram of a motor ventilation structure of the motor shown in FIG. 1；
FIG. 3 is a three-dimensional schematic diagram of a double-suction fan of the motor ventilation structure shown in FIG. 2；
FIG. 4 is a schematic diagram of the operating principle of a motor according to a second embodiment of the present invention； and
FIG. 5 is a schematic diagram of the operating principle of a motor according to a third embodiment of the present invention.
DETAILED DESCRIPTION
To enable objectives, technical solutions, and advantages of the present invention to be clearer, the present invention is further described in detail by the following embodiments.
FIG. 1 is a three-dimensional schematic diagram of a motor according to a first embodiment of the present invention. It should be noted that for ease of description, FIG. 1 only shows some elements of the motor. FIG. 2 is a three-dimensional schematic diagram of a motor ventilation structure of the motor shown in FIG. 1. Referring to FIG. 1 and FIG. 2, a motor 30 includes a motor ventilation structure 20； the motor ventilation structure 20 is disposed inside a housing 31 of the motor 30； the motor 30 is provided with a drive end 301 and a non-drive end 302 opposite to the drive end 301. The motor ventilation structure 20 includes a first air baffle 21, a plurality of ventilation pipes 22, and a double-suction fan 23.
The first air baffle 21 is located on the drive end 301, and the first air baffle 21 is spaced from a side wall 311 of the housing 31 of the motor 30, so as to form an  accommodation space 210 with the housing 31.
The ventilation pipes 22 are fixed on the first air baffle 21, and extend from the non-drive end 302 of the motor 30 to the drive end 301 of the motor 30, and are in communication with the accommodation space 210.
The double-suction fan 23 is fixedly sleeved on a rotation shaft 32 of the motor 30 and is disposed on one side, close to the non-drive end 302, of the first air baffle 21. The double-suction fan 23 is configured to extract air from the non-drive end 302 to the drive end 301, and extract air in the accommodation space 210 and air for axial-radial cooling out of the housing 31 of the motor 30.
More specifically, the first air baffle 21 is provided with a flat plate portion 211 and an inclined plate portion 212. The inclined plate portion 212 is disposed on an end portion of the flat plate portion 211 and inclines relative to the flat plate portion 211. The inclined plate portion 212 is disposed between the flat plate portion 211 and the side wall 311 of the housing 31 of the motor 30. The flat plate portion 211 is provided thereon with an air inlet 213 and a plurality of air vents 214. A part of the double-suction fan 23 is disposed in the air inlet 213, and the ventilation pipes 22 are in communication with corresponding air vents 214.
The ventilation pipe 22 has a hollow structure. In this embodiment, there are four ventilation pipes 22, and the four ventilation pipes 22 are arranged on the flat plate portion 211 of the first air baffle 21 at intervals. The quantity of the ventilation pipe 22 is not limited to this embodiment, and may be arbitrarily set according to actual situations.
FIG. 3 is a three-dimensional schematic diagram of the double-suction fan of the motor ventilation structure shown in FIG. 2. Referring to FIG. 3, the double-suction fan 23 is fixed on the rotation shaft 32 and may rotate along with the rotation shaft 32. The double-suction fan 23 includes a partition plate 231, a primary fan disk 234, a secondary fan disk 235, a plurality of primary fan blades 236, and a plurality of secondary fan blades 237. The partition plate 231 is fixedly sleeved on the rotation shaft 32 of the motor 30. The partition plate 231 is provided with a first surface 232 and a second surface 233 opposite to  the first surface 232. The first surface 232 faces the non-drive end 302, and the second surface 233 faces the drive end 301. The plurality of primary fan blades 236 is fixed between the first surface 232 and the primary fan disk 234. The plurality of secondary fan blades 237 is fixed between the second surface 233 and the secondary fan disk 235.
It should be noted that the double-suction fan 23 is a centrifugal fan. The length of the primary fan blade 236 is greater than the length of the secondary fan blade 237 along a direction parallel to the rotation shaft 32. The width of the primary fan blade 236 gradually decreases along a direction from the first surface 232 to the primary fan disk 234, and the width of secondary fan blade 237 gradually decreases along a direction from the second surface 233 to the secondary fan disk 235.
The motor 30 further includes a second air baffle 33 and a plurality of support plates 34. The first air baffle 21 and the second air baffle 33 are respectively located on two sides of the double-suction fan 23. Specifically, a part of the primary fan disk 234 of the double-suction fan 23 is inserted into an air inlet of the second air baffle 33, and a part of the secondary fan disk 235 is inserted into an air inlet 213 of the first air baffle 21. The structure of the second air baffle 33 is the same as the structure of the first air baffle 21, and details are not described herein again. The first air baffle 21 is spaced from the second air baffle 33 back to back. The second air baffle 33 and the inclined plate portion of the first air baffle 21 may perform the function of guiding air flowing from the housing 31 of the motor 30.
In this embodiment, there are three support plates 34, and the three support plates 34 are disposed at intervals. However, the quantity of the support plates 34 is not limited in the present invention, and the quantity of the support plates 34 may be arbitrarily set according to actual situations. In this embodiment, a rotor core and a stator core of the motor 30 penetrate through the support plate 34, and are supported by the support plate 34. Each support plate 34 is further provided thereon with a plurality of ventilation pipe installation holes (not labeled) and a plurality of air vents (not labeled) . The ventilation pipes 22 may be inserted into the ventilation pipe installation holes, and cooling air may flow through the air vents.
During operation, cooling air inside a cooling apparatus outside the housing 31 of the motor 30 enters the housing 31 along a direction D1, and is divided into a first part of cooling air and a second part of cooling air. The first part of cooling air flows through ventilation channels of the rotor core and the stator core of the motor 30, and flows along a direction D2, a direction D3, to a direction D4 after flowing out of the ventilation channels of the rotor core and the stator core. After cooling the rotor core and the stator core, the first part of cooling air becomes a first part of hot air. Then, the first part of hot air is extracted out of the housing 31 along a direction D5 under effects of the primary fan disk 234 and the primary fan blade 236 of the double-suction fan 23. The second part of cooling air enters the ventilation pipe 22, flows through the ventilation pipe 22 from right to left, and then flows into the accommodation space 210 formed by the first air baffle 21 and the housing 31. The second part of cooling air cools a bearing of the drive end of the motor 30 and becomes a second part of hot air. Then, the second part of hot air is extracted out of the housing 31 along a direction D6 under effects of the secondary fan disk 235 and the secondary fan blade 237 of the double-suction fan 23.
It should be noted that, according to the motor 30 of the first embodiment, the type of the cooling apparatus outside the housing 31 of the motor 30 is not limited, and the structure and the operating principle of the cooling apparatus will be described in detail in a second embodiment and a third embodiment.
FIG. 4 is a schematic diagram of the operating principle of a motor according to a second embodiment of the present invention. Referring to FIG. 4, a motor 30 of the second embodiment is similar to the motor 30 of the first embodiment, and a difference lies in that the motor 30 of the second embodiment further includes a cooling apparatus 40. The cooling apparatus 40 is an air-cooled cooling apparatus, and includes a cooling cover 41, a plurality of cooling pipes 42, and an external fan 43. The cooling cover 41 is assembled on a housing 31 and is in communication with the housing 31. The plurality of cooling pipes 42 is disposed in the cooling cover 41 at intervals and is in communication with the outside. A rotation shaft 32 is assembled on the housing 31 and passes through the housing 31. The external fan 43 is located on a non-drive end 302 of the motor 30, is fixedly sleeved on an  end portion of the rotation shaft 32, and may rotate along with the rotation shaft 32. The external fan 43 is configured to extract outside air into the cooling pipes 42 of the cooling cover 41, so that the cooling pipes 42 may cool hot air that enters the cooling cover 42.
It should be noted that the motor 30 of the second embodiment also includes a motor ventilation structure 20, and a ventilation pipe 22 of the motor ventilation structure 20 extends from the non-drive end 302 of the motor 30 to a drive end 301 of the motor 30.
Referring to FIG. 3 at the same time, during operation, the external fan 43 extracts the outside air into the cooling cover 41. The outside air that enters the cooling cover 41 first flows along a direction D7, then flows through the cooling pipes 42 along a direction D8 from right to left, and is finally discharged from the cooling cover 41. Because the outside air is guided into the cooling pipes 42, heat exchange may be performed between the cooling pipes 42 and the hot air flowing from the housing 31 into the cooling cover 41. After the heat exchange, the hot air becomes cooling air. The cooling air in the cooling cover 41 enters the housing 31 along a direction D1, and is divided into a first part of cooling air and a second part of cooling air. The first part of cooling air flows through ventilation channels of a rotor core and a stator core of the motor 30, and flows along a direction D2, a direction D3, to a direction D4 after flowing out of the ventilation channels of the rotor core and the stator core. After cooling the rotor core and the stator core, the first part of cooling air becomes a first part of hot air. Then, the first part of hot air is extracted out of the housing 31 along a direction D5 under effects of a primary fan disk 234 and a primary fan blade 236 of a double-suction fan 23, and enters the cooling cover 41.
The second part of cooling air enters the ventilation pipe 22, flows through the ventilation pipe 22 from right to left, and then flows into an accommodation space 210 formed by a first air baffle 21 and the housing 31. The second part of cooling air cools a bearing of the drive end of the motor 30 and becomes a second part of hot air. Then, the second part of hot air is extracted out of the housing 31 along a direction D6 under effects of a secondary fan disk 235 and a secondary fan blade 237 of the double-suction fan 23, and enters the cooling cover 41. The hot air becomes cooling air after being cooled by the cooling apparatus 40, and the cooling air then enters the housing 31 along the direction D1.  This cycle repeats.
FIG. 5 is a schematic diagram of the operating principle of a motor according to a third embodiment of the present invention. Referring to FIG. 5, a motor 30 of the third embodiment is similar to the motor 30 of the second embodiment, and a difference lies in that a cooling apparatus 50 of the motor 30 of the third embodiment is a water-cooled cooling apparatus, and includes a cooling cover 51 and a water-cooled core 52. The cooling cover 51 is assembled on a housing 31 and is in communication with the housing 31. The water-cooled core 52 is disposed in the cooling cover 51 and includes a plurality of water-cooled fins disposed at intervals. Each of the water-cooled fins is provided thereon with a cooling water pipe. When hot air in the cooling cover 51 flows through gaps of the water-cooled core 52, heat exchange may be performed between the hot air in the cooling cover 51 and cooling water in the water-cooled core 52, so that the hot air becomes cooling air after being cooled.
Referring to FIG. 3 at the same time, during operation, the cooling air in the cooling cover 51 enters the housing 31 along a direction D1, and is divided into a first part of cooling air and a second part of cooling air. The first part of cooling air flows through ventilation channels of a rotor core and a stator core of the motor 30, and flows along a direction D2, a direction D3, to a direction D4 after flowing out of the ventilation channels of the rotor core and the stator core. After cooling the rotor core and the stator core, the first part of cooling air becomes a first part of hot air. Then, the first part of hot air is extracted out of the housing 31 along a direction D5 under effects of a primary fan disk 234 and a primary fan blade 236 of a double-suction fan 23, and enters a cooling cover 41.
The second part of cooling air enters a ventilation pipe 22, flows through the ventilation pipe 22 from right to left, and then flows into an accommodation space 210 formed by a first air baffle 21 and the housing 31. The second part of cooling air cools a bearing of a drive end of the motor 30 and becomes a second part of hot air. Then, the second part of hot air is extracted out of the housing 31 along a direction D6 under effects of a secondary fan disk 235 and a secondary fan blade 237 of the double-suction fan 23, and enters the cooling cover 41. The hot air that enters the cooling cover 41 flows through  gaps of the water-cooled core 52 along a direction D9 from left to right, and heat exchange is performed between the hot air in the cooling cover 41 and the cooling water in the water-cooled core 52. The hot air becomes cooling air, and then the cooling air enters the housing 31 along the direction D1. This cycle repeats.
The motor ventilation structure and the motor of the present invention have at least the following advantages:
1. In the motor ventilation structure and the motor of the present invention, a first air baffle is located on a drive end of the motor, and forms an accommodation space with a housing of the motor； a plurality of ventilation pipes extending from a non-drive end of the motor to the drive end of the motor and is in communication with the accommodation space； under the effect of a double-suction fan, two parts of circulation cooling air may be provided for inside of the motor； the cooling air of the non-drive end of the motor may flow into the accommodation space through the ventilation pipe so as to cool a bearing of the drive end of the motor, thereby ensuring that the bearing of the drive end of the motor has an appropriate temperature, without increasing an outer diameter of an inner fan and without causing excessive windage and friction loss of the motor, so that the motor may achieve relatively high heat dissipation efficiency；
2. In an embodiment of the motor ventilation structure and the motor of the present invention, the first air baffle is provided with a flat plate portion and an inclined plate portion； the inclined plate portion is disposed between the flat plate portion and a side wall of the housing of the motor, and the inclined plate portion is disposed so as to facilitate forming an accommodation space between the first air baffle and the housing of the motor. In addition, when the double-suction fan extracts air in the accommodation space out of the housing of the motor, the inclined plate portion may perform the function of guiding the air；
3. In an embodiment of the motor ventilation structure and the motor of the present invention, the double-suction fan includes a primary fan blade and a secondary fan blade； the length of the primary fan blade is greater than the length of the secondary fan blade along a direction parallel to a rotation shaft； the volume of air extracted by the primary fan blade is greater than the volume of air extracted by the secondary fan blade, so that the  volume of air for cooling a rotor core and a stator of the motor and the volume of air for cooling a bearing of the drive end may be controlled；
4. In an embodiment of the motor of the present invention, the motor further includes a second air baffle, and the structure of the second air baffle is similar to the structure of the first air baffle； the second air baffle is spaced from the first air baffle back to back； the second air baffle and the inclined plate portion of the first air baffle may perform the function of guiding air flowing from the housing of the motor； and
5. In an embodiment of the motor ventilation structure and the motor of the present invention, the motor further includes an air-cooled cooling apparatus or a water-cooled cooling apparatus； this is determined according to actual requirements, so that the motor can be conveniently and flexibly applied.
The foregoing descriptions are merely preferred embodiments of the present invention, but are not intended to limit the present disclosure. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (10)

  1. A motor ventilation structure (20) , wherein the motor ventilation structure (20) is disposed inside a housing (31) of a motor (30) , the motor (30) is provided with a drive end (301) and a non-drive end (302) opposite to the drive end (301) , and the motor ventilation structure (20) comprises:
    a first air baffle (21) , located on the drive end (301) , wherein the first air baffle (21) is spaced from a side wall (311) of the housing (31) of the motor (30) , so as to form an accommodation space (210) with the housing (31) ；
    a ventilation pipe (22) , fixed on the first air baffle (21) , wherein the ventilation pipe (22) extends from the non-drive end (302) of the motor (30) to the drive end (301) and is in communication with the accommodation space (210) ； and
    a double-suction fan (23) , fixedly sleeved on a rotation shaft (32) of the motor (30) and disposed on one side, close to the non-drive end (302) , of the first air baffle (21) , wherein the double-suction fan (23) is configured to extract air from the non-drive end (302) to the drive end (301) , and extract air in the accommodation space (210) and air for axial-radial cooling out of the housing (31) of the motor (30) .
  2. The motor ventilation structure (20) according to claim 1, wherein the first air baffle (21) is provided with a flat plate portion (211) and an inclined plate portion (212) ； the inclined plate portion (212) is disposed on an end portion of the flat plate portion (211) and inclines relative to the flat plate portion (211) ； the inclined plate portion (212) is disposed between the flat plate portion (211) and the side wall (311) of the housing (31) of the motor (30) .
  3. The motor ventilation structure (20) according to claim 2, wherein the flat plate portion (211) is provided thereon with an air inlet (213) and a plurality of air vents (214) , a part of the double-suction fan (23) is disposed in the air inlet (213) , and the ventilation pipe (22) is in communication with a corresponding air vent (214) .
  4. The motor ventilation structure (20) according to claim 1, wherein the  double-suction fan (23) comprises:
    a partition plate (231) , fixedly sleeved on the rotation shaft (32) of the motor (30) , wherein the partition plate (231) is provided with a first surface (232) and a second surface (233) opposite to the first surface (232) , the first surface (232) faces the non-drive end (302) , and the second surface (233) faces the drive end (301) ；
    a primary fan disk (234) ；
    a secondary fan disk (235) ；
    a plurality of primary fan blades (236) , fixedly disposed between the first surface (232) and the primary fan disk (234) ； and
    a plurality of secondary fan blades (237) , fixedly disposed between the second surface (233) and the secondary fan disk (235) .
  5. The motor ventilation structure (20) according to claim 4, wherein the length of the primary fan blade (236) is greater than the length of the secondary fan blade (237) along a direction parallel to the rotation shaft (32) .
  6. The motor ventilation structure (20) according to claim 4, wherein the double-suction fan (23) is a centrifugal fan.
  7. A motor (30) , comprising a motor ventilation structure (20) according to any one of claims 1 to 6.
  8. The motor (30) according to claim 7, wherein the motor (30) further comprises:
    a second air baffle (33) , wherein the first air baffle (21) and the second air baffle (33) are respectively located on two sides of the double-suction fan (23) .
  9. The motor (30) according to claim 7, wherein the motor (30) further comprises a cooling apparatus (40) , and the cooling apparatus (40) comprises:
    a cooling cover (41) , assembled on the housing (31) of the motor (30) and in communication with the housing (31) ；
    a plurality of cooling pipes (42) , disposed in the cooling cover (41) at intervals and in  communication with the outside； and
    an external fan (43) , fixedly sleeved on an end portion of the rotation shaft (32) and located on the non-drive end (302) of the motor (30) , wherein the external fan (43) is configured to extract outside air into the cooling pipe (42) of the cooling cover (41) .
  10. The motor (30) according to claim 7, wherein the motor (30) further comprises a cooling apparatus (50) , and the cooling apparatus (50) comprises:
    a cooling cover (51) , assembled on the housing (31) of the motor (30) and in communication with the housing (31) ； and
    a water cooling core (52) , disposed in the cooling cover (51) .
PCT/CN2017/082616 2017-04-28 2017-04-28 Motor ventilation structure and motor Ceased WO2018196003A1 (en)

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CN109599989A (en) * 2019-01-27 2019-04-09 武汉多可特医疗器械有限公司 A kind of cooling micromotor
CN112984652A (en) * 2019-12-17 2021-06-18 阿里巴巴集团控股有限公司 Fan coil unit equipment, adjusting method and device thereof, air conditioning equipment and adjusting method
CN115149704A (en) * 2022-07-13 2022-10-04 电子科技大学长三角研究院(湖州) Combined shell for air-cooled servo motor
CN115962563A (en) * 2022-12-09 2023-04-14 小米科技(武汉)有限公司 Air duct sealing assembly and air conditioner
US11670977B2 (en) 2019-04-24 2023-06-06 Black & Decker Inc. Outer rotor brushless motor stator mount
CN117526642A (en) * 2022-09-27 2024-02-06 浙江国际海运职业技术学院 Coupling cooling device for dragging motor
CN119765786A (en) * 2024-12-06 2025-04-04 安徽皖南新维电机有限公司 Permanent magnet motor for aerial platform operation vehicle

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CN109599989A (en) * 2019-01-27 2019-04-09 武汉多可特医疗器械有限公司 A kind of cooling micromotor
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CN112984652A (en) * 2019-12-17 2021-06-18 阿里巴巴集团控股有限公司 Fan coil unit equipment, adjusting method and device thereof, air conditioning equipment and adjusting method
CN115149704A (en) * 2022-07-13 2022-10-04 电子科技大学长三角研究院(湖州) Combined shell for air-cooled servo motor
CN117526642A (en) * 2022-09-27 2024-02-06 浙江国际海运职业技术学院 Coupling cooling device for dragging motor
CN115962563A (en) * 2022-12-09 2023-04-14 小米科技(武汉)有限公司 Air duct sealing assembly and air conditioner
CN119765786A (en) * 2024-12-06 2025-04-04 安徽皖南新维电机有限公司 Permanent magnet motor for aerial platform operation vehicle

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