CN112117840B - Brushless Outer Rotor Motor - Google Patents
Brushless Outer Rotor Motor Download PDFInfo
- Publication number
- CN112117840B CN112117840B CN202010612644.1A CN202010612644A CN112117840B CN 112117840 B CN112117840 B CN 112117840B CN 202010612644 A CN202010612644 A CN 202010612644A CN 112117840 B CN112117840 B CN 112117840B
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- China
- Prior art keywords
- outer rotor
- retainer
- brushless
- rotor motor
- fan
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- 230000000694 effects Effects 0.000 abstract description 8
- 230000017525 heat dissipation Effects 0.000 abstract description 8
- 238000004804 winding Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 244000025254 Cannabis sativa Species 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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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
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
-
- 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
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/04—Balancing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
A brushless outer rotor motor comprises an inner stator and an outer rotor, wherein the inner stator comprises a stator core, and the outer rotor comprises a rotating shaft extending axially and a casing fixed on the rotating shaft. The casing comprises an outer circular side wall and an end wall positioned at one end of the outer circular side wall, a containing cavity is formed by the outer circular side wall and the end wall in a surrounding mode, the stator core is positioned between the rotating shaft and the outer circular side wall in the radial direction, the outer rotor comprises a retainer which is formed integrally and is fixedly held on the casing, the retainer is contained in the containing cavity, and a plurality of fan blades protruding into the containing cavity are arranged. The fan blades are uniformly distributed along the circumferential direction to form a fan, and the fan is adjacent to the stator core, so that the brushless outer rotor motor has good heat dissipation effect and the motor performance can be exerted more fully; meanwhile, the retainer has a pole groove for accommodating a pole to fixedly support the pole, thereby improving the fixing accuracy of the pole.
Description
[ Technical field ]
The invention relates to a brushless outer rotor motor, in particular to a brushless outer rotor motor with good heat dissipation effect.
[ Background Art ]
Brushless external rotor motors are widely used in various fields due to high power density and small size, such as electric chain saws, blowers and grass cutters, and are one of the devices used in the current brushless external rotor motors. A brushless outer rotor motor in an electric chain saw, a blower and a grass trimmer comprises an inner stator and an outer rotor, wherein the inner stator is arranged in a machine shell and is provided with a stator winding, and a main body of the outer rotor surrounds the outer periphery of the inner stator and is provided with magnetic poles. However, the brushless outer rotor motor generally has a fan structure designed on a cast aluminum structural member, so that the motor has large overall size, complex process and high cost.
Chinese patent publication No. CN209217852U discloses a direct-drive motor, which includes a stator and a rotor, the rotor has an integrally formed casing, and the casing has a bottom wall and a peripheral wall connected to the bottom wall. The bottom wall of the shell is provided with the vent holes to form a fan, and the fan structure solves the problems of large overall size and high cost of the motor to a certain extent. However, the fan is formed by stamping from the bottom wall of the casing, so that the blades of the fan cannot be made into a complex structure due to the limitation of the bottom wall, the height and the number of the blades cannot be designed effectively, and when the size of the motor is increased to a certain size, the thickness of the casing is increased to a certain value, and at the moment, the fan is formed by stamping from the bottom wall of the casing with great difficulty, so that the fan structure has great limitation in use and wide applicability.
In view of the above, it is desirable to provide an improved brushless external rotor motor that overcomes the shortcomings of the prior art.
[ Summary of the invention ]
Aiming at the defects of the prior art, the invention aims to provide a brushless outer rotor motor with good heat dissipation effect, which reduces the cost while ensuring the performance.
The technical scheme adopted by the invention for solving the problems in the prior art is that the brushless outer rotor motor comprises an inner stator and an outer rotor, wherein the inner stator comprises a stator core, and the outer rotor comprises an axially extending rotating shaft and a casing fixed on the rotating shaft. The casing comprises an outer circular side wall and an end wall positioned at one end of the outer circular side wall, a containing cavity is formed by the outer circular side wall and the end wall in a surrounding mode, the stator core is positioned between the rotating shaft and the outer circular side wall in the radial direction, the outer rotor comprises a retainer which is formed integrally and is fixedly held on the casing, the retainer is contained in the containing cavity, and a plurality of fan blades protruding into the containing cavity are arranged.
The improved scheme is that the retainer is provided with an outer ring fixed on the inner wall surface of the outer circular side wall, and a plurality of fan blades extend inwards from the inner wall surface of the outer ring.
The fan blades are uniformly distributed along the circumferential direction to form a fan, the fan is adjacent to the stator core, and the distance from the fan to the inner stator is 2.5-5 mm.
The fan blade is positioned between the stator core and the end wall in the axial direction, one axial end of the fan blade is adjacent to the stator core, and the other axial end of the fan blade extends to the inner wall surface of the end wall.
The further improvement scheme is that the retainer is not connected with the rotating shaft, and the distance between the fan blade and the rotating shaft is not smaller than 0.5mm.
The outer rotor comprises a plurality of magnetic poles which are attached to the inner wall surface of the outer circular side wall and are uniformly distributed along the circumferential direction, the retainer is axially positioned between the magnetic poles and the end wall, the retainer is provided with magnetic pole grooves which are formed by recessing one end of the outer ring adjacent to the magnetic poles, and the magnetic pole grooves are arranged corresponding to the magnetic poles and at least partially accommodate the magnetic poles so as to fix the magnetic poles.
The casing is provided with an inner edge part protruding from the tail end of the end wall to the inner stator, and the retainer is arranged between the inner edge part and the outer circular side wall.
The retainer is provided with an inner ring, the fan blades are connected to the inner ring, and the inner ring is located between the inner edge part and the outer circular side wall.
The machine shell comprises a shaft hole positioned in the center of the end wall, the inner edge part extends from the inner side of the shaft hole along the axial direction, and the rotating shaft penetrates through the shaft hole and is matched with the inner edge part so as to fix the machine shell on the rotating shaft.
The outer rotor further comprises a balance ring fixed on the rotating shaft, the balance ring is attached to the outer wall surface of the end wall of the shell, and the balance ring and the retainer are respectively located at two axial ends of the end wall.
Compared with the prior art, the outer rotor has the beneficial effects that the shell comprises an outer circular side wall and an end wall positioned at one end of the outer circular side wall, the outer circular side wall and the end wall are surrounded by a containing cavity, the outer rotor comprises a retainer which is integrally formed and fixedly held on the shell, and the retainer is contained in the containing cavity and provided with a plurality of fan blades protruding into the containing cavity. The fan blades are uniformly distributed along the circumferential direction to form a fan, and the fan is adjacent to the stator core, so that the brushless outer rotor motor has good heat dissipation effect and the motor performance can be exerted more fully; the holder has a pole groove for receiving a pole to fixedly support the pole, thereby improving the fixing accuracy of the pole. Meanwhile, the retainer is an injection molding part, the shape, the number, the height and the like of the blades of the retainer can be designed in a diversified mode, the requirement of product diversification is met, and furthermore, the balance ring is arranged on the outer side of the shell, so that the balance quantity of the motor can be corrected conveniently.
[ Description of the drawings ]
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings:
Fig. 1 is a perspective view of a brushless outer rotor motor according to a preferred embodiment of the present invention;
FIG. 2 is a partially exploded view of the brushless outer rotor motor shown in FIG. 1;
FIG. 3 is a cross-sectional view of the brushless outer rotor motor of FIG. 1 in an axial direction;
FIG. 4 is an exploded schematic view of the outer rotor of the brushless outer rotor motor of FIG. 2;
fig. 5 is a perspective view of a cage in the outer rotor shown in fig. 4;
FIG. 6 is a front view of the cage of FIG. 5;
fig. 7 is a perspective view of a second embodiment of the cage of the present invention.
Meaning of reference numerals in the drawings:
100. Brushless outer rotor motor 10, outer rotor 11, rotary shaft 12, casing 120, shaft hole 121, outer circumferential side wall 122, end wall 123, through hole 124, inner rim 125, housing cavity 13, retainer 131, outer ring 132, inner ring 133, blades 134, pole grooves 135, channels 14, poles 15, balancing ring 16, retainer 161, outer ring 163, blades 164, pole grooves 20, inner stator
Detailed description of the preferred embodiments
Referring to fig. 1 to 6, a brushless outer rotor motor 100 according to the present invention is applied to an electric tool and has the characteristics of high efficiency, long service life, etc. The brushless outer rotor motor 100 includes an outer rotor 10 and an inner stator 20, wherein the outer rotor 10 is coated on the outer side of the inner stator 20 and rotates relative to the inner stator 20.
Referring to fig. 2, the stator 20 includes a stator core, that is, a stator lamination, and preferably, the outer diameter of the stator core is 50-95 mm. In this embodiment, the stator core has 12 stator slots, each stator slot is used for winding a stator coil, a 3-phase winding is formed by winding wires on the stator slots, stator teeth are arranged between slots of the stator slots for providing magnetic flux density, so as to generate electromagnetic torque, and a stator yoke is formed between the stator slots and an inner hole of the stator punching sheet for providing magnetic flux density of a yoke portion.
Referring to fig. 3 and 4, the outer rotor 10 includes an axially extending shaft 11, a housing 12 fixed on the shaft 11, a holder 13 fixed in the housing 12, and a plurality of magnetic poles 14. The casing 12 is an integrally formed metal piece and comprises an outer circular side wall 121 and a circular end wall 122 positioned at one end of the outer circular side wall 121, the outer circular side wall 121 and the end wall 122 are surrounded by an accommodating cavity 125, and the stator core is radially positioned between the rotating shaft 11 and the outer circular side wall 121. The casing 12 includes a shaft hole 120 at the center of the end wall 122 and an inner edge portion 124 extending axially from the inner side of the shaft hole 120, the inner edge portion 124 protruding from the end of the end wall 122 toward the inner stator 20. The rotating shaft 11 passes through the shaft hole 120 and cooperates with the inner edge 124 to fix the housing 12 to the rotating shaft 11, and at this time, the rotating shaft 11 drives the housing 12 to rotate together.
Referring to fig. 5, the retainer 13 is an integrally molded injection molded piece and is accommodated in the accommodating cavity 125, the retainer 13 includes an outer ring 131 fixed on an inner wall surface of the outer sidewall 121, an inner ring 132 located between the inner edge 124 and the outer sidewall 121, and a plurality of fan blades 133 located between the outer ring 131 and the inner ring 132, the fan blades 133 extend inward from the inner wall surface of the outer ring 131, and one side of the fan blades 133 away from the outer ring 131 is connected and fixed to the inner ring 132. The retainer 13 is disposed between the inner edge 124 and the outer sidewall 121, and the retainer 13 is not connected to the rotating shaft 11, and a distance between the fan blade 133 and the rotating shaft 11 is not less than 0.5mm, so as to avoid interference between the fan blade 133 and the rotating shaft 11. Meanwhile, the fan blades 133 protrude into the accommodating cavity 125 and are uniformly distributed along the circumferential direction to form a fan, and the fan is adjacent to the stator core of the inner stator 20, so that the brushless outer rotor motor 100 has a good heat dissipation effect and can exert motor performance more fully.
Because the retainer 13 is an injection molding piece with the density of about 1.0-1.4 g/cm <3 >, compared with the die-casting aluminum piece in the traditional design, the weight of the retainer is light, and the starting current of the outer rotor 10 is reduced due to small moment of inertia during operation, so that the response speed of the switch is improved. Meanwhile, the braking current in the circuit can be reduced in the working condition with braking requirement, so that the braking service life of the brushless outer rotor motor 100 is prolonged, and the heat-resistant selection of the insulating material of the motor and the heat-resistant grade of the enameled wire can be properly reduced.
The number of the blades 133 of the retainer 13 may be flexibly selected according to different requirements of products and space structures inside the outer rotor, in this embodiment, the number of the blades is 15, and the shape of the blades 133 may be designed to correspond to the requirements of the products, for example, the blades 133 may extend toward the axis of the rotating shaft 11 and be arranged in a deflection manner to form an axial fan, and the deflection angle of the blades is 10 degrees, so as to further improve the air volume of the brushless outer rotor motor 100. Compared with the fan structure formed on the casing in the conventional design, the fan structure of the retainer 13 of the present invention has wide applicability, especially when the outer diameter of the brushless outer rotor motor 100 is 60-110 mm and the brushless outer rotor motor is low in rotation speed.
In this embodiment, the fan blade 133 is located between the stator core and the end wall 122 in the axial direction, and one axial end of the fan blade 133 is adjacent to the stator core, while the other axial end extends to the inner wall surface of the end wall 122. The end wall 122 is provided with a plurality of through holes 123 uniformly distributed along the circumferential direction, a channel 135 is formed between the blades 133 of the retainer 13, the through holes 123 are communicated with the channel 133 to form an air channel, and when the outer rotor 10 works, the air flow formed by the fan is ensured to flow through the outer rotor 10 to be blown to the stator core of the inner stator 20. Meanwhile, the distance from the fan to the inner stator 20 is 2.5-5 mm, and the brushless outer rotor motor 100 achieves the best heat dissipation effect. In practical applications, the end wall 122 of the housing 12 may be punched to form different shapes and numbers of through holes 123 according to requirements, and in this embodiment, the number of through holes 123 is 4.
As shown in fig. 6, the magnetic poles 14 are attached to the inner wall surface of the outer sidewall 122 of the casing 12 and are uniformly distributed along the circumferential direction, in this embodiment, the number of the magnetic poles 14 is 8, and the magnetic poles 14 are made of an alfeb material. The holder 13 is axially located between the magnetic pole 14 and the end wall 122, and the holder 13 is provided with a magnetic pole groove 134 recessed from one end of the outer ring 131 adjacent to the magnetic pole 14, the magnetic pole groove 134 being disposed corresponding to the magnetic pole 14 and at least partially accommodating the magnetic pole 14 to fixedly support the magnetic pole 14, thereby ensuring the fixing accuracy of the magnetic pole 14. Therefore, the retainer 13 has the function of fixing the supporting magnetic pole 14 and also has the function of cooling the fan.
The retainer 13 of the present invention can design the corresponding magnetic pole grooves 134 according to the number and shape of the magnetic poles 14, and firmly arrange the magnetic poles 14 on the inner wall surface of the casing 12 through the related tolerance fit, and, since the retainer 13 is injection molded, has high dimensional and positional accuracy, the magnetic poles 14 can be uniformly distributed on the outer circular side wall 121 of the casing 12 as required, which is helpful for the magnetic poles 14 to provide a uniform and consistent magnetic field in one cycle, so that the performance of the motor is ensured. At the same time, this enables accurate supply of the magnetic pole position for the brushless motor using the sensor (e.g., hall sensor), and the most effective output utilization of the driving energy of the controller, thereby improving the rotational speed accuracy of the brushless outer rotor motor 100 and reducing the load torque fluctuation.
Meanwhile, the brushless outer rotor motor 100 provides corresponding torque output to drive related components to work in the running process, due to interaction of forces, the magnetic poles 14 generate corresponding tangential force along the inner wall surface of the outer circular side wall 121 in the casing 12 of the outer rotor 10, the two sides of the magnetic pole grooves 134 of the retainer 13 circumferentially fix and support the magnetic poles 14, the requirement on the glue quality characteristics of the fixed magnetic poles 14 can be greatly reduced, the selection application range of the glue is wider, and the heights of the two sides of the magnetic pole grooves 134 can be designed according to the size of the output power of the motor and the height of the magnetic poles 14.
The outer rotor 10 further comprises a balancing ring 15 fixed on the rotating shaft 11, the balancing ring 15 is abutted against the outer wall surface of the end wall 122 of the casing 12, and the balancing ring 15 and the retainer 13 are respectively located at two axial ends of the end wall 122. The balance ring 15 is arranged on the outer side of the shell 12, so that the balance amount of the motor is conveniently corrected, and meanwhile, the balance ring 15 replaces the design of milling and correcting the balance amount on a fan of the existing cast aluminum structural member, so that the defect of reducing the air quantity caused by milling of the fan is avoided.
In the present invention, the casing 12 includes an outer sidewall 121 and an end wall 122 at one end of the outer sidewall 121, the outer sidewall 121 and the end wall 122 enclose a receiving cavity 125, the outer rotor 10 includes a holder 13 integrally formed and fixed on the casing 12, and the holder 13 is received in the receiving cavity 125 and provided with a plurality of blades 133 protruding into the receiving cavity 125. The blades 133 are uniformly distributed along the circumferential direction to form a fan, the fan is adjacent to the stator core, so that the brushless outer rotor motor 100 has a good heat dissipation effect and the motor performance can be fully exerted, and the retainer 13 is provided with a magnetic pole groove 134 for accommodating the magnetic pole 14 so as to fixedly support the magnetic pole 14, thereby improving the fixing precision of the magnetic pole 14. Meanwhile, the retainer 13 is an injection molding part, the shape, the number, the height and the like of the blades of the retainer can be designed in a diversified manner, the requirement of product diversification is met, and furthermore, the balance ring 15 is arranged on the outer side of the shell 12, so that the balance amount of the motor can be corrected conveniently.
Referring to fig. 7, the second embodiment is different from the first embodiment in that the retainer 16 is an integrally molded injection molded piece and includes an outer ring 161 fixed to an inner wall surface of the outer sidewall 121, a fan blade 163 extending inward from the inner wall surface of the outer ring 161, and a magnetic pole slot 164 for accommodating the magnetic pole 14, but does not have the inner ring. The fan blades 163 are uniformly distributed along the circumferential direction to form a fan, and the fan is adjacent to the stator core of the inner stator 20, so that the brushless outer rotor motor 100 has a good heat dissipation effect and can exert motor performance more fully. In this embodiment, the fan blade 163 has sufficient strength so that the free end thereof does not need to be fixed by an inner ring. Meanwhile, the fan blades 163 may not extend toward the axis of the rotating shaft 11 when extending inward, and only need to generate enough air flow to blow toward the inner stator 20 when the outer rotor 10 works.
The present invention is not limited to the above-described embodiments. Those of ordinary skill in the art will readily appreciate that many alternatives to the brushless outer rotor motor of the present invention are possible without departing from the spirit and scope of the present invention. The protection scope of the present invention is subject to the claims.
Claims (10)
1. The brushless outer rotor motor comprises an inner stator and an outer rotor, wherein the inner stator comprises a stator core, the outer rotor comprises a rotating shaft extending axially and a casing fixed on the rotating shaft, and the brushless outer rotor motor is characterized in that the casing comprises an outer circular side wall and an end wall positioned at one end of the outer circular side wall, a containing cavity is formed by surrounding the outer circular side wall and the end wall, the stator core is positioned between the rotating shaft and the outer circular side wall in the radial direction, the outer rotor comprises a retainer integrally formed and fixedly arranged on the casing and a plurality of magnetic poles fixedly arranged in the casing, the retainer at least partially accommodates the magnetic poles, is contained in the containing cavity and is provided with a plurality of fan blades protruding into the containing cavity.
2. The brushless outer rotor motor of claim 1, wherein the retainer comprises an outer ring fixed to an inner wall surface of the outer circumferential side wall, and the plurality of blades extend inward from the inner wall surface of the outer ring.
3. The brushless outer rotor motor of claim 2, wherein the blades are uniformly distributed along a circumferential direction to form a fan, the fan is adjacent to the stator core, and a distance from the fan to the inner stator is 2.5-5 mm.
4. The brushless outer rotor motor of claim 3, wherein the fan blade is located between the stator core and the end wall in an axial direction, and an axial one end of the fan blade is adjacent to the stator core and an axial other end extends to an inner wall surface of the end wall.
5. The brushless outer rotor motor of claim 2, wherein the retainer is not connected to the shaft, and a distance between the fan blade and the shaft is not less than 0.5mm.
6. The brushless outer rotor motor of claim 2, wherein the outer rotor includes a plurality of magnetic poles fitted to an inner wall surface of the outer circumferential side wall and uniformly distributed in a circumferential direction, the holder is axially located between the magnetic poles and the end wall, and the holder is provided with a magnetic pole groove recessed from an end of the outer ring adjacent to the magnetic poles, the magnetic pole groove being disposed corresponding to the magnetic poles and at least partially accommodating the magnetic poles to fix the magnetic poles.
7. The brushless outer rotor motor of claim 1, wherein the housing is provided with an inner rim portion protruding from an end of the end wall toward the inner stator, and the retainer is disposed between the inner rim portion and the outer circumferential side wall.
8. The brushless outer rotor motor of claim 7, wherein the retainer is provided with an inner ring, the fan blades are connected to the inner ring, and the inner ring is located between the inner edge portion and the outer circular side wall.
9. The brushless outer rotor motor of claim 7, wherein the housing includes a shaft hole at a center of the end wall, the inner rim portion extends axially from an inner side of the shaft hole, and the shaft passes through the shaft hole and cooperates with the inner rim portion to fix the housing to the shaft.
10. The brushless outer rotor motor of claim 1, wherein the outer rotor further comprises a balancing ring fixed on the rotating shaft, the balancing ring is abutted against an outer wall surface of the end wall of the casing, and the balancing ring and the retainer are respectively located at two axial ends of the end wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010612644.1A CN112117840B (en) | 2020-06-30 | 2020-06-30 | Brushless Outer Rotor Motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010612644.1A CN112117840B (en) | 2020-06-30 | 2020-06-30 | Brushless Outer Rotor Motor |
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| Publication Number | Publication Date |
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| CN112117840A CN112117840A (en) | 2020-12-22 |
| CN112117840B true CN112117840B (en) | 2024-12-20 |
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| CN202010612644.1A Active CN112117840B (en) | 2020-06-30 | 2020-06-30 | Brushless Outer Rotor Motor |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114598105B (en) * | 2022-03-25 | 2023-12-22 | 宁波创跃园林工具有限公司 | Chain saw |
| CN115118046A (en) * | 2022-06-28 | 2022-09-27 | 江苏东成工具科技有限公司 | An outer rotor motor and its fan |
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| CN209545272U (en) * | 2019-04-30 | 2019-10-25 | 中山大洋电机股份有限公司 | A kind of external rotor electric machine |
| CN212343445U (en) * | 2020-06-30 | 2021-01-12 | 江苏东成工具科技有限公司 | Brushless Outer Rotor Motor |
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| JP2000287430A (en) * | 1999-03-29 | 2000-10-13 | Matsushita Electric Ind Co Ltd | Brushless motor, pump using the same, and method of magnetizing brushless motor magnet |
| JP2003348795A (en) * | 2002-05-23 | 2003-12-05 | Nidec Shibaura Corp | Outer rotor blower |
| TWM288735U (en) * | 2005-10-21 | 2006-03-11 | Super Electronics Co Ltd | Externally-rotated DC Brushless motor and fan having inner directed ring-shape ferrite magnet |
| CN2847670Y (en) * | 2005-11-01 | 2006-12-13 | 秀波电子股份有限公司 | Outrunning Brushless DC Motor and Fan with Inner Diameter Aligned Ring Magnets |
| KR101714477B1 (en) * | 2015-04-13 | 2017-03-09 | 전자부품연구원 | OUTER ROTOR MOTOR WITH A STREAMLINED Blade for POWER OF of Unmanned Aircraft Robot |
| CN205883016U (en) * | 2016-07-07 | 2017-01-11 | 洛阳中方实业有限公司 | Brushless motor |
| KR101889946B1 (en) * | 2016-10-31 | 2018-08-21 | (주)키프로토 | Air blower apparatus of outer rotor type fan-motor |
| CN108155758A (en) * | 2018-03-09 | 2018-06-12 | 上海惠深工具科技有限公司 | From cooling external rotor electric machine |
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2020
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209545272U (en) * | 2019-04-30 | 2019-10-25 | 中山大洋电机股份有限公司 | A kind of external rotor electric machine |
| CN212343445U (en) * | 2020-06-30 | 2021-01-12 | 江苏东成工具科技有限公司 | Brushless Outer Rotor Motor |
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