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CN111668947B - Cooling system and disc type motor with same - Google Patents

Cooling system and disc type motor with same Download PDF

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Publication number
CN111668947B
CN111668947B CN202010514326.1A CN202010514326A CN111668947B CN 111668947 B CN111668947 B CN 111668947B CN 202010514326 A CN202010514326 A CN 202010514326A CN 111668947 B CN111668947 B CN 111668947B
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China
Prior art keywords
cooling channel
cooling
motor
stator
end cover
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CN202010514326.1A
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CN111668947A (en
Inventor
孙明灿
曹茂永
马凤英
孙凯
纪鹏
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Shandong Hengji Group Co ltd
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Qilu University of Technology
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Priority to CN202010514326.1A priority Critical patent/CN111668947B/en
Priority to ZA2020/05336A priority patent/ZA202005336B/en
Publication of CN111668947A publication Critical patent/CN111668947A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/04—Machines with one rotor and two stators
    • 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
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The invention relates to a cooling system and a disc type motor with the cooling system, belonging to the technical field of motors and comprising a cooling channel inlet, a cooling channel outlet and a cooling channel communicated with the cooling channel inlet and the cooling channel outlet, wherein the cooling channel is positioned on a stator, the stator is provided with a cooling channel placement groove, the stator is also provided with a dovetail groove for accommodating a dovetail groove wedge for fixing the stator, and the dovetail groove wedge and the cooling channel placement groove are provided with cooling channel holes at corresponding positions. The invention has the advantages of compact structure, good cooling effect and no obvious increase of processing difficulty on the premise of not increasing the axial length of the motor.

Description

Cooling system and disc type motor with same
Technical Field
The invention relates to a cooling system and a disc type motor with the cooling system, belongs to the technical field of motors, and is particularly suitable for the disc type motor with a stator connected with an end cover by a dovetail groove.
Background
The first motor invented by faraday in 1831 was a disk motor. However, the manufacturing and mounting processes of the stator and the rotor of the motor are complex, and the axial magnetic tension between the stator and the rotor is large, so that the axial load of the bearing is large, the mechanical loss is increased, and the efficiency is low. Therefore, when 1837 a conventional radial flux (cylindrical) motor was produced, the disc motor was cooled down. For over a hundred years, conventional radial flux machines have been dominant.
With the development of modern industry, the demand for miniaturization and flattening of the motor is generated, the disk type motor with a flat structure is paid attention again, and the research on the motor is more and more. Compared with the traditional radial magnetic motor, the disc type motor has the characteristics of short axial size, high power density and the like, and is usually applied to special application occasions with limited axial space.
The disc type motor can be divided into four types according to the number and relative position of the stator and the rotor: single stator and single rotor structure, double rotor and single stator structure and multiple disc structure. The stator fixing process requirement is lower for the double-stator single-rotor structure compared with other structures. Meanwhile, the amorphous alloy has the advantage of low loss, and can obviously improve the efficiency of the motor when used on the motor. However, the amorphous alloy has the mechanical characteristics of being thin, brittle and hard, and the stator fixing mode cannot adopt the mode of welding the silicon steel sheet stator and the end cover. Aiming at the characteristics of amorphous alloy, an amorphous alloy stator is generally connected with a motor end cover by adopting a dovetail groove.
There are two common cooling methods for disc motors: firstly, a front end cover and a rear end cover are additionally provided with cooling water jackets to cool a motor by using circulating water; the other is that the end cover and the shell are additionally provided with radiating fins, and forced air cooling is carried out by a radiating fan. However, the above cooling methods all increase the axial or radial length of the disc motor, which is not favorable for increasing the power density of the motor.
Chinese patent CN104065211A discloses an iron-cored self-circulation evaporation cooling disc type motor, which adopts a cooling mode of sealing a stator and a winding in a sealing disc to cool the stator and the winding, and utilizes a cooling medium in a cavity of the stator to vaporize, and the vapor is changed into liquid after entering a condenser to realize heat transfer, thereby cooling the motor. The method has the defects of large motor air gap length, high machining precision requirement and limited heat dissipation area of the external condenser, and is difficult to realize.
Chinese patent CN107579620A discloses a disc motor double-end cover cooling structure and a disc motor, wherein cooling systems of cooling channels are arranged on end covers at two sides of the disc motor, and the cooling of the motor is realized by cooling media in the cooling channels. The method has the advantages of compact structure, simple process, convenience in installation and the like, but the thickness of the motor end cover is inevitably increased in order to arrange the cooling channel on the end cover of the disc type motor and ensure the mechanical strength of the motor end cover.
In summary, the conventional cooling method for a disc motor mainly has the following disadvantages: 1. the cooling system has a complex structure, requires a high processing technology and is difficult to realize; 2. the addition of the cooling system can lead to the increase of the axial size of the disc type motor, which is not beneficial to the improvement of the power density of the motor.
Disclosure of Invention
In order to solve the technical defects, the invention provides a cooling system and a disc type motor with the cooling system, and the cooling system which has the advantages of compact structure, good cooling effect and no obvious increase of processing difficulty can be realized on the premise of not increasing the axial length of the motor.
In one aspect, the invention provides a cooling system, which comprises a cooling channel inlet, a cooling channel outlet and a cooling channel communicated with the cooling channel inlet and the cooling channel outlet, wherein the cooling channel is positioned on a stator yoke, the stator yoke is provided with a cooling channel placement groove, the stator yoke is also provided with a dovetail groove for accommodating and fixing a stator dovetail slot wedge, and a cooling channel opening is arranged at the position of the dovetail slot wedge corresponding to the cooling channel placement groove.
The technical scheme of the invention also comprises: the cooling channel comprises an outer circle cooling channel and an inner circle cooling channel, an outer circle cooling channel placing groove and an inner circle cooling channel placing groove are formed in the stator, outer circle cooling channel holes are formed in the positions, corresponding to the outer circle cooling channel placing groove, of the dovetail groove wedges, and inner circle cooling channel holes are formed in the positions, corresponding to the inner circle cooling channel placing groove, of the dovetail groove wedges.
The technical scheme of the invention also comprises: the outer circle cooling channel and the inner circle cooling channel are connected in parallel or in series.
The technical scheme of the invention also comprises: the cooling channel is positioned in the iron core yoke part of the stator close to the end cover, and the cooling channel is annular.
The technical scheme of the invention also comprises: the cooling channel is made of a flat copper pipe which is easy to bend and made of softer material, and the flat copper pipe is placed in the cooling channel placing groove and penetrates through the cooling channel hole of the dovetail slot wedge.
The technical scheme of the invention also comprises: and a heat conduction layer is arranged between the flat copper pipe and the dovetail groove wedge as well as between the flat copper pipe and the cooling channel placement groove.
On the other hand, the invention also provides a disc type motor with the cooling system, which comprises a shell, a motor front end cover, a motor rear end cover, a rotor disc, a winding and a stator, wherein the rotor disc, the winding and the stator are positioned in the shell, the motor front end cover and the motor rear end cover, the stator is provided with a cooling channel placement groove, the stator is fixed through a dovetail groove wedge, a cooling channel opening is formed in the position, corresponding to the cooling channel placement groove, of the dovetail groove wedge, and a cooling channel inlet and a cooling channel outlet which are communicated with the cooling channel placement groove are formed in the shell.
The technical scheme of the invention also comprises: the number of the stators is two, and the iron core yokes of the two stators are respectively provided with a cooling channel placement groove.
The technical scheme of the invention also comprises: and heat conducting layers are arranged between the stator and motor front end cover and the motor rear end cover, and between the flat copper pipe and the motor front end cover and between the flat copper pipe and the motor rear end cover.
The invention has the beneficial effects that: the dovetail slot wedges and the stator of the motor are properly utilized, the cooling channel is arranged on the dovetail slot wedges of the stator and the fixed stator, the axial space of the disc type motor can not be occupied, and the power density of the motor can be improved; meanwhile, the cooling channel is directly connected with the stator and is connected with the stator through the dovetail slot wedge, so that the thermal resistance on a heat dissipation path is obviously reduced, and the cooling effect of the cooling system is greatly improved.
On the other hand, the stator is respectively cooled by the inner circle cooling channel and the outer circle cooling channel, the inner circle cooling branch and the outer circle cooling branch are connected in parallel or in series, cooling medium is injected through the inlet of the cooling channel, the cooling medium enters the inner circle branch and the outer circle branch simultaneously or sequentially, after the cooling medium finishes heat exchange with the stator and the rotor, heat is taken away from the outlet of the cooling channel, heat exchange of the motor is finished, cooling of the motor is achieved, the structure is compact, the process is simple, and the motor cooling device is suitable for mass production.
Drawings
FIG. 1 is a schematic of the present invention.
FIG. 2 is a schematic view of the cooling system of the present invention with the end caps removed.
FIG. 3 is a schematic view of the dovetail wedge and stator and cooling channel assembly.
FIG. 4 is a schematic view of a dovetail wedge.
11. Cooling channel entry, 12, cooling channel export, 13, excircle cooling channel, 14, interior circle cooling channel, 21, motor front end housing, 22, motor rear end housing, 3, rotor dish, 4, winding, 5, stator, 51, cooling channel mounting groove, 52, stator tooth, 6, casing, 7, dovetail slot wedge, 71, excircle cooling channel trompil, 72, interior circle cooling channel trompil, 73, screw hole.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
As shown in fig. 1 to 4, the cooling system and the disc motor having the cooling system of the present invention can obtain a disc motor having a compact structure, a good cooling effect, and no significant increase in processing difficulty of the cooling system without increasing the axial length of the motor.
The present embodiment is specifically described with respect to a double-stator single-rotor amorphous alloy disc motor, but is not limited thereto, and other silicon steel sheet disc motors may also adopt the cooling method of the present invention.
The disc type motor comprises a shell 6, a motor front end cover 21 and a motor rear end cover 22, wherein a rotor disc 3, a winding 4 and a stator 5 are arranged in a cavity formed by the shell 6, the motor front end cover 21 and the motor rear end cover 22, and specifically, the double-stator single-rotor amorphous alloy disc type motor of the embodiment has two stators 5. The stator 5 is fixedly connected with the motor end cover through the dovetail slot wedge 7, a dovetail slot is specifically processed on the stator 5, and after the dovetail slot wedge 7 is inserted into the dovetail slot, the dovetail slot wedge 7 is fixedly connected with the motor front end cover 21 or the motor rear end cover 22 through a threaded hole 73 in the dovetail slot wedge 7.
A cooling channel placing groove 51 is processed on the stator 5, and a cooling channel opening is processed on the dovetail slot wedge 7 through the corresponding position of the cooling channel placing groove 51. Thereby, the cooling medium enters the cooling passage from the cooling passage inlet 11 of the casing 6, cools and cools the stator 5, the dovetail wedge 7, and the like, and is finally discharged from the cooling passage outlet 12 of the casing 6, thereby completing the cooling and cooling cycle.
In this embodiment, the cooling channel is composed of a cooling channel placement groove 51 and a flat copper tube which is easy to bend and made of soft material and is installed in the cooling channel opening.
In order to reduce the thermal resistance between the flat copper tube and the dovetail slot wedge 7, and between the flat copper tube and the stator 5, the heat of the motor is convenient to transfer to the cooling channel, and heat conduction layers are arranged between the flat copper tube and the dovetail slot wedge, and particularly heat conduction silicone grease can be filled. Similarly, in order to reduce the thermal resistance among other components, heat-conducting silicone grease is filled between the flat copper tube and the motor front end cover 21, the motor rear end cover 22, and between the amorphous alloy stator 5 and the motor front end cover 21 and the motor rear end cover 22.
In this embodiment, for improving the cooling effect, an inner circle cooling channel 14 and an outer circle cooling channel 13 are provided, and specifically, an outer circle cooling channel installation groove and an inner circle cooling channel installation groove are processed in the iron core yoke portion of the stator 5 near the end cover side, and cooperatively, the dovetail slot wedge 7 processes the outer circle cooling channel opening 71 and the inner circle cooling channel opening 72 at positions corresponding to the outer circle cooling channel installation groove and the inner circle cooling channel installation groove.
In this embodiment, the inner circle cooling channel 14 and the outer circle cooling channel 13 may be connected in parallel or in series. That is, the cooling medium entering from the cooling channel inlet 11 can enter the inner circle cooling channel and the outer circle cooling channel simultaneously or sequentially, cool the stator 5, the dovetail slot wedge 7 and other components, and then be discharged from the cooling channel outlet 12 after cooling the motor.
In this embodiment, the two stators 5 are both provided with cooling channels, specifically, as shown in fig. 3, the core of the stator 5 includes stator teeth 52 and a yoke portion, the surface of the yoke portion is processed with cooling channel placement grooves 51, and the cooling channels of the two stators 5 are symmetrically arranged.
The cooling system of the invention comprises a cooling channel inlet 11, a cooling channel outlet 12 and an annular cooling channel, which is provided for both stators 5 on both sides. The cooling medium is injected through the cooling channel inlet 11, and after heat transfer with the motor is completed through the cooling channel tightly attached to the iron core, the heat is taken out from the cooling channel outlet 12, so that the cooling of the motor is realized, the heat exchange of the motor is completed, the structure is compact, the process is simple, the cooling effect is good, and the motor cooling device is suitable for batch production. The cooling system adopted by the double-stator single-rotor cooling system disc type motor provided by the invention does not increase the volume of the motor additionally.
The above description is only exemplary of the present invention and should not be taken as limiting the invention in any way, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1.一种冷却系统，包括冷却通道入口（11）、冷却通道出口（12）以及连通冷却通道入口（11）和冷却通道出口（12）的冷却通道，其特征在于：所述冷却通道位于定子（5）上，定子（5）上设置有冷却通道安置槽（51），定子（5）上还设置用于容纳固定定子（5）的燕尾槽和燕尾槽楔（7），所述燕尾槽楔（7）与冷却通道安置槽（51）对应位置设置有冷却通道开孔；1. A cooling system, comprising a cooling channel inlet (11), a cooling channel outlet (12), and a cooling channel communicating with the cooling channel inlet (11) and the cooling channel outlet (12), wherein the cooling channel is located in a stator (5), the stator (5) is provided with a cooling channel placement slot (51), and the stator (5) is also provided with a dovetail slot and a dovetail wedge (7) for accommodating the fixed stator (5). The wedge (7) is provided with a cooling channel opening at a position corresponding to the cooling channel placement groove (51); 所述冷却通道由易于弯曲材质较软的扁铜管制成，扁铜管放置在冷却通道安置槽（51）内且穿过燕尾槽楔（7）的冷却通道开孔；所述扁铜管和燕尾槽楔（7）以及扁铜管和冷却通道安置槽（51）之间设置有导热层。The cooling channel is made of a flat copper tube with a softer material that is easy to bend, and the flat copper tube is placed in the cooling channel placement groove (51) and passes through the cooling channel opening of the dovetail slot wedge (7); the flat copper tube A heat-conducting layer is arranged between the dovetail slot wedge (7), the flat copper tube and the cooling channel placement slot (51). 2.如权利要求1所述的一种冷却系统，其特征在于：所述冷却通道包括外圆冷却通道（13）和内圆冷却通道（14），定子（5）上设置有外圆冷却通道安置槽和内圆冷却通道安置槽，燕尾槽楔（7）与外圆冷却通道安置槽对应位置设置有外圆冷却通道开孔（71），燕尾槽楔（7）与内圆冷却通道安置槽对应位置设置有内圆冷却通道开孔（72）。2. A cooling system according to claim 1, characterized in that: the cooling channel comprises an outer circular cooling channel (13) and an inner circular cooling channel (14), and the stator (5) is provided with an outer circular cooling channel The placement slot and the placement slot for the inner circular cooling channel, the dovetail slot wedge (7) and the placement slot for the outer circular cooling channel are provided with an outer circular cooling channel opening (71), the dovetail slot wedge (7) and the inner circular cooling channel placement slot. Corresponding positions are provided with inner circular cooling channel openings (72). 3.如权利要求2所述的一种冷却系统，其特征在于：所述外圆冷却通道（13）和内圆冷却通道（14）并联或串联连通。3. A cooling system according to claim 2, characterized in that: the outer circular cooling channel (13) and the inner circular cooling channel (14) are connected in parallel or in series. 4.如权利要求1所述的一种冷却系统，其特征在于：所述冷却通道位于定子（5）铁心靠近电机端盖侧轭部中，冷却通道呈环形。4. A cooling system according to claim 1, characterized in that: the cooling channel is located in the side yoke of the stator (5) iron core close to the motor end cover, and the cooling channel is annular. 5.一种具有以上任一权利要求所述冷却系统的盘式电机，包括机壳（6）、电机前端盖（21）和电机后端盖（22），以及位于机壳（6）、电机前端盖（21）和电机后端盖（22）内部的转子盘（3）、绕组（4）和定子（5），其特征在于：所述定子（5）上设置有冷却通道安置槽（51），定子（5）通过燕尾槽楔（7）固定，燕尾槽楔（7）与冷却通道安置槽（51）对应位置设置有冷却通道开孔，机壳（6）上设置有与冷却通道安置槽（51）连通的冷却通道入口（11）和冷却通道出口（12）。5. A disc motor having the cooling system according to any one of the preceding claims, comprising a casing (6), a motor front end cover (21) and a motor rear end cover (22), and a motor located in the casing (6), the motor The rotor disk (3), the windings (4) and the stator (5) inside the front end cover (21) and the motor rear end cover (22) are characterized in that: the stator (5) is provided with a cooling channel placement slot (51) ), the stator (5) is fixed by the dovetail slot wedge (7), the dovetail slot wedge (7) is provided with a cooling channel opening corresponding to the cooling channel placement slot (51), and the casing (6) is provided with a cooling channel placement The cooling channel inlet (11) and the cooling channel outlet (12) communicate with the groove (51). 6.如权利要求5所述的一种具有冷却系统的盘式电机，其特征在于：所述定子（5）的数量是两个，两个定子（5）的铁心轭部中均设置有冷却通道安置槽（51）。6. A disc motor with a cooling system according to claim 5, characterized in that: the number of the stators (5) is two, and cooling is provided in the core yokes of the two stators (5). Channel placement slot (51). 7.如权利要求5所述的一种具有冷却系统的盘式电机，其特征在于：所述定子（5）分别与电机前端盖（21）和电机后端盖（22）之间均设置有导热层，所述扁铜管分别与电机前端盖（21）和电机后端盖（22）之间均设置有导热层。7. A disc motor with a cooling system according to claim 5, characterized in that: the stator (5) and the motor front end cover (21) and the motor rear end cover (22) are respectively provided with A heat-conducting layer is provided between the flat copper tube and the motor front end cover (21) and the motor rear end cover (22), respectively.
CN202010514326.1A 2020-06-08 2020-06-08 Cooling system and disc type motor with same Active CN111668947B (en)

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ZA2020/05336A ZA202005336B (en) 2020-06-08 2020-08-27 Cooling system and disc motor with cooling system

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Address after: 274700 south of 300m west of SuZhuang bridge, east section of Jinhe Road, economic development zone, yuncheng county, Heze City, Shandong Province

Patentee after: SHANDONG HENGJI GROUP CO.,LTD.

Address before: 250353 University Road, Changqing District, Ji'nan, Shandong Province, No. 3501

Patentee before: Qilu University of Technology

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Denomination of invention: A cooling system and a disc motor with the same cooling system

Granted publication date: 20220222

Pledgee: Industrial and Commercial Bank of China Limited Yuncheng sub branch

Pledgor: SHANDONG HENGJI GROUP CO.,LTD.

Registration number: Y2024980002660

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