CN211089247U - Brushless external rotor motor - Google Patents
Brushless external rotor motor Download PDFInfo
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- CN211089247U CN211089247U CN201922415356.2U CN201922415356U CN211089247U CN 211089247 U CN211089247 U CN 211089247U CN 201922415356 U CN201922415356 U CN 201922415356U CN 211089247 U CN211089247 U CN 211089247U
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- outer rotor
- rotor motor
- external rotor
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Abstract
A brushless external rotor motor is applied to an air compressor and comprises a rotating shaft, an external rotor connected with the rotating shaft and an internal stator positioned between the rotating shaft and the external rotor, wherein the external rotor comprises a shell and a plurality of magnetic poles uniformly distributed along the circumferential direction of the inner wall of the shellThe inner stator comprises a plurality of tooth grooves which are uniformly distributed along the circumferential direction. The number ratio of the tooth grooves to the magnetic poles is 18: 16 and the poles are made of ferrite material. When the diameter of the brushless outer rotor motor is 100-125 mm and the no-load rotating speed of the brushless outer rotor motor is not higher than 3500RPM, the ratio of the output power to the volume of the brushless outer rotor motor is 1.5-13.5W/cm3Within the range, the processing difficulty and the cost control of the brushless outer rotor motor can reach the optimal point while the performance of the brushless outer rotor motor is ensured.
Description
[ technical field ]
The utility model relates to a brushless external rotor electric machine, in particular to be applied to brushless external rotor electric machine in the air compressor machine.
[ background art ]
The brushless external rotor motor is widely applied to various fields due to its large power density and small volume, for example, an air compressor is also one of the devices applied to the brushless external rotor motor at present. The brushless outer rotor motor in the air compressor comprises an inner stator and an outer rotor, wherein the inner stator is installed in a shell of the air compressor and is provided with a stator winding, and a main body of the outer rotor surrounds the periphery of the inner stator and is provided with a magnetic pole. However, the magnetic poles of the outer rotor are usually made of neodymium iron boron (ndfeb) material, and the ndfeb material needs expensive rare earth, so that the cost of the brushless outer rotor motor is higher than that of other motors. Meanwhile, in order to avoid overheating of the stator winding on the inner stator, the brushless outer rotor motor needs to be provided with an independent fan for radiating heat of the stator winding. Therefore, the size of the brushless outer rotor motor is increased, and the cost of the brushless outer rotor motor is further improved. Therefore, it is a problem to be solved to reduce the cost of the brushless outer rotor motor while ensuring the performance of the brushless outer rotor motor.
Accordingly, there is a need for an improved brushless external rotor motor that overcomes the shortcomings of the prior art.
[ contents of utility model ]
Not enough to prior art, the utility model aims to provide a brushless external rotor electric machine of low-cost high power, this brushless external rotor electric machine has reduced its cost when guaranteeing its performance.
The utility model provides a technical scheme that prior art problem adopted is: a brushless outer rotor motor comprises a rotating shaft, an outer rotor connected with the rotating shaft and an inner stator located between the rotating shaft and the outer rotor, wherein the outer rotor comprises a machine shell and a plurality of magnetic poles uniformly distributed along the circumferential direction of the inner wall of the machine shell, and the inner stator comprises a plurality of tooth grooves uniformly distributed along the circumferential direction. The number ratio of the tooth grooves to the magnetic poles is 18: 16. when the diameter of the brushless outer rotor motor is 100-125 mm and the no-load rotation speed of the brushless outer rotor motor is not higher than 3500RPM, the ratio of the output power to the volume of the brushless outer rotor motor is 1.5-13.5W/cm3Within the range.
The further improvement scheme is as follows: the diameter of the brushless outer rotor motor is 113mm, and when the no-load rotating speed of the brushless outer rotor motor 1 is not higher than 3500RPM, the output of the brushless outer rotor motorThe maximum value of the power output and the volume ratio is 4.5W/cm3。
The further improvement scheme is as follows: the magnetic pole is a tile magnetic pole and consists of an outer arc, an inner arc and side edges which are bilaterally symmetrical and are connected with the outer arc and the inner arc, and the outer arc of the magnetic pole is attached to the inner wall of the machine shell.
The further improvement scheme is as follows: the inner arc of the magnetic pole of the outer rotor and the outer arc of the tooth groove of the inner stator are concentric circles, and an air gap exists between the inner arc of the magnetic pole and the outer arc of the tooth groove.
The further improvement scheme is as follows: the inner stator comprises a stator framework which is uniformly distributed along the circumferential direction, and a stator winding is arranged on the stator framework.
The further improvement scheme is as follows: the quantity of stator skeleton is 18, just the stator skeleton with the tooth's socket sets up at interval each other.
The further improvement scheme is as follows: when the brushless outer rotor motor rotates, the brushless outer rotor motor is provided with two groups of stator frameworks and magnetic poles, the central lines of the stator frameworks and the magnetic poles are respectively superposed, and the two groups of stator frameworks and the magnetic poles are respectively positioned at two radial ends of the axis of the rotating shaft.
The further improvement scheme is as follows: the casing of outer rotor is by the integrative stamping forming of metalwork, just the casing includes excircle lateral wall and is located the circular end wall of excircle lateral wall one end, the magnetic pole laminate in the inboard of excircle lateral wall.
The further improvement scheme is as follows: the end wall is provided with a plurality of blades formed by outward blanking and through holes positioned at the blades, and the blades are uniformly distributed on the end wall along the circumferential direction to form fan blades together with the end wall.
The further improvement scheme is as follows: the brushless outer rotor motor is applied to an air compressor.
Compared with the prior art, the utility model discloses following beneficial effect has: the brushless outer rotor motor adopts the pole-slot number ratio of 18 slots/16 poles, and when the diameter of the brushless outer rotor motor is 100-125 mm and the no-load rotating speed of the brushless outer rotor motor is not higher than 3500RPM, the output power and the body of the brushless outer rotor motorThe product ratio is 1.5-13.5W/cm3Within the range. The processing difficulty and the cost control of the brushless outer rotor motor can reach the optimal point while the performance of the brushless outer rotor motor is ensured; meanwhile, the magnetic pole adopts cheap ferrite materials to replace expensive neodymium iron boron materials so as to control the cost to the utmost extent; furthermore, the fan blades and the machine shell are integrally formed in a punching mode, the heat dissipation requirement is met, and meanwhile the space occupied by the additional independent fan blades and the independent fan blades is saved, so that the axial distance of the brushless outer rotor motor is shortened, and the size of the brushless outer rotor motor is reduced.
[ description of the drawings ]
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:
fig. 1 is a perspective view of a brushless external 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 an exploded view of an outer rotor of the brushless outer rotor motor shown in fig. 2;
FIG. 4 is a perspective view of a casing in the outer rotor of FIG. 3;
fig. 5 is a sectional view of the brushless outer rotor motor shown in fig. 1 in an axial direction;
fig. 6 is a radial sectional view of the brushless outer rotor motor shown in fig. 1.
The meaning of the reference symbols in the figures:
100. brushless external rotor motor 10, rotating shaft 20, external rotor 21, casing 22, magnetic pole 23, excircle side wall 24, end wall 25, blade 26, through hole 30, internal stator 31, tooth groove 32, stator framework
[ detailed description of the invention ]
Fig. 1 to fig. 2 show a brushless external rotor motor 100 according to the present invention, which is applied to an air compressor and has the characteristics of high efficiency, small size, long service life, etc. The brushless external rotor motor 100 includes a rotation shaft 10, an external rotor 20 connected to the rotation shaft 10, and an internal stator 30 located between the rotation shaft 10 and the external rotor 20, wherein the external rotor 20 is fixed to the rotation shaft 10, and the rotation shaft 10 rotates with the external rotor 20 relative to the internal stator 30.
Referring to fig. 3 and 4, the outer rotor 20 includes a casing 21 and a plurality of magnetic poles 22 uniformly distributed along the circumferential direction of the inner wall of the casing 21, and the magnetic poles 22 are attached to the inner wall of the casing 21. Casing 21 is by the integrative stamping forming of metalwork, just casing 21 includes excircle lateral wall 23 and is located the circular end wall 24 of excircle lateral wall 23 one end, magnetic pole 22 laminates in the inboard of excircle lateral wall 23. The end wall 24 is provided with a plurality of blades 25 which are formed by punching outwards and through holes 26 which are positioned at the blades 25, and the blades 25 are uniformly distributed on the end wall 24 along the circumferential direction to form fan blades together with the end wall 24.
In the present embodiment, the blade 25 is punched and formed from the end wall 24 of the housing 21, so that the through hole 26 is naturally formed at the blade 25, i.e. the through hole 26 does not need to be punched separately. When the brushless outer rotor motor 100 works, the casing 21 of the outer rotor 20 drives the fan blades to rotate so as to make the air flow, thereby achieving the cooling effect and making the brushless outer rotor motor 100 work more stably. Meanwhile, the fan blades and the machine shell 21 are integrally formed in a punching mode, so that the heat dissipation requirement is met, and the space occupied by the additional independent fan blades and the independent fan blades is saved, the axial distance of the brushless outer rotor motor 100 is shortened, and the size of the brushless outer rotor motor 100 is reduced.
Referring to fig. 2 and 6, the inner stator 30 is accommodated in the casing 21 of the outer rotor 20 and includes a plurality of slots 31 and a stator frame 32 uniformly distributed along a circumferential direction, and a stator winding is disposed on the stator frame 32. The number of the stator frames 32 is the same as that of the tooth grooves 31, and the stator frames 32 and the tooth grooves 33 are arranged at intervals. The number ratio of the tooth grooves 31 to the magnetic poles 22 is 18: 16, the magnetic poles 22 are made of ferrite material, when the diameter of the brushless external rotor motor 100 is 100-125 mm and the no-load rotation speed of the brushless external rotor motor 100 is not higher than 3500RPM, the ratio of the output power to the volume of the brushless external rotor motor 100 is 1.5-13.5W/cm3Within the range, the performance required when the motor is arranged in the air compressor is achieved.
The overall cost of the brushless outer rotor motor 100 is equal toThe sum of the cost of the outer rotor 20 and the cost of the inner stator 30. The cost of the outer rotor 20 is mainly the cost of the magnetic poles 22, and as the number of the magnetic poles 22 of the outer rotor 20 is larger, the thickness of the magnetic poles 22 is reduced, so that the cost of the magnetic poles 22 is reduced, and the volume of the outer rotor 20 is reduced. The cost of the inner stator 30 includes the material cost and the manufacturing cost of the stator core, the material cost of the stator core generally does not fluctuate, and the manufacturing difficulty of the inner stator 30 is higher as the number of the tooth slots 32 of the inner stator 30 is larger, that is, the manufacturing cost of the stator core is increased as the number of the tooth slots 32 is larger. In order to control the overall cost of the brushless outer rotor motor 100, the number of magnetic poles 22 of the outer rotor 20 should be increased and the number of slots 32 of the inner stator 30 should be decreased; meanwhile, since the ratio of the number of the slot stages of the magnetic poles 22 and the tooth grooves 32 affects the performance of the brushless external rotor motor 100, a suitable number of the slot stages needs to be selected. Based on the above requirements, the brushless external rotor motor 100 adopts an optimal 18-slot 16-level ratio, so that the output power-to-volume ratio of the brushless external rotor motor 100 is 1.5-13.5W/cm3Within the range, performance of brushless outer rotor motor 100 is thereby ensured.
The utility model discloses in brushless external rotor electric machine 100 adopts the pole slot number ratio of 18 groove 16 utmost point, works as brushless external rotor electric machine 100's diameter is at 100 ~ 125mm, and when brushless external rotor electric machine 100 no-load speed is not higher than 3500RPM, brushless external rotor electric machine 100's output and volume ratio are at 1.5 ~ 13.5W/cm3Within the range. While ensuring the performance of the brushless outer rotor motor 100, the processing difficulty and cost control of the brushless outer rotor motor 100 can reach the optimal point: if the number of slot poles is increased, the manufacturing process of brushless outer rotor motor 100 becomes difficult to realize, the defective rate increases, and the manufacturing cost increases, and if the number of slot poles is decreased, the unit price of magnetic pole 22 increases.
Meanwhile, the neodymium iron boron material needs to use rare earth with high price, the rare earth with high price is greatly fluctuated by the market, and the magnetic pole 22 adopts cheap ferrite material to replace the expensive neodymium iron boron materialThe cost can be better controlled. In this embodiment, the diameter of the brushless external rotor motor 100 is 113mm, and when the no-load rotation speed of the brushless external rotor motor 100 is not higher than 3500RPM, the maximum value of the ratio of the output power to the volume of the brushless external rotor motor 100 can reach 4.5W/cm3At this time, the brushless outer rotor motor 100 has an optimal cost performance, that is, the cost of the brushless outer rotor motor 100 is controlled to be extremely low.
Referring to fig. 5 and 6, the magnetic pole 22 is a tile magnetic pole and is composed of an outer arc, an inner arc and side edges which are symmetrical left and right and connect the outer arc and the inner arc, and the outer arc of the magnetic pole 22 is attached to the inner wall of the casing 21. The inner arc of the magnetic pole 22 of the outer rotor 20 and the outer arc of the tooth groove 31 of the inner stator 30 are concentric circles, and an air gap exists between the inner arc of the magnetic pole 22 and the outer arc of the tooth groove 31. When the brushless external rotor motor 100 rotates, the brushless external rotor motor 100 has two sets of stator frames 32 and magnetic poles 22 whose central lines are respectively overlapped, and the two sets of stator frames 32 and magnetic poles 22 are respectively located at two ends of a straight line passing through the axis of the rotating shaft 10; namely, two sets of symmetrical through-tooth slots (A, B) push the outer rotor 20 to rotate by cutting magnetic lines, thereby increasing the utilization rate of the magnetic field, improving the efficiency of the brushless outer rotor motor 100, increasing the power of the brushless outer rotor motor 100, ensuring the stability of the brushless outer rotor motor 100 in operation and reducing noise.
The air compressor with the brushless outer rotor motor 100 is a 24L air storage tank air compressor with the air pumping time within 40S, can achieve the speed regulation function, and the speed regulation range covers low speed (double-pipe air inlet air compressor) and high speed (two-stage air compressor), namely the air compressor achieves the real dual-purpose of one machine.
The utility model discloses in, brushless external rotor electric machine 100 adopts 18 grooves 16 utmost points utmost point groove number ratio, works as brushless external rotor electric machine 100's diameter is at 100 ~ 125mm, and when brushless external rotor electric machine 100 no-load speed is not higher than 3500RPM, brushless external rotor electric machine 100's output and volume ratio are at 1.5 ~ 13.5W/cm3Within the range. That is, while ensuring the performance of brushless outer rotor motor 100, the processing difficulty and cost control of brushless outer rotor motor 100 can reach the optimal point: if the number of slot poles is increased, the manufacturing process of brushless outer rotor motor 100 becomes difficult to realize, the defective rate increases, and the manufacturing cost increases, and if the number of slot poles is decreased, the unit price of magnetic pole 22 increases. Meanwhile, the magnetic pole 22 adopts cheap ferrite materials to replace expensive neodymium iron boron materials so as to better control the cost; furthermore, the fan blades and the housing 21 are integrally formed in a stamping manner, so that the heat dissipation requirement is met, and the space occupied by the additional independent fan blades and the independent fan blades is saved, thereby shortening the axial distance of the brushless outer rotor motor 100 and reducing the volume of the brushless outer rotor motor 100.
The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that many alternatives to the brushless external rotor electric machine may be employed without departing from the spirit and scope of the present invention. The protection scope of the present invention is subject to the content of the claims.
Claims (10)
1. A brushless external rotor motor comprises a rotating shaft, an external rotor connected with the rotating shaft and an internal stator positioned between the rotating shaft and the external rotor, wherein the external rotor comprises a machine shell and a plurality of magnetic poles uniformly distributed along the circumferential direction of the inner wall of the machine shell, and the internal stator comprises a plurality of tooth grooves uniformly distributed along the circumferential direction; the method is characterized in that: the number ratio of the tooth grooves to the magnetic poles is 18: 16, when the diameter of the brushless outer rotor motor is 100-125 mm and the no-load rotation speed of the brushless outer rotor motor is not higher than 3500RPM, the ratio of the output power to the volume of the brushless outer rotor motor is 1.5-13.5W/cm3Within the range.
2. The brushless external rotor electric machine according to claim 1, wherein: the diameter of the brushless outer rotor motor is 113mm, and when the no-load rotating speed of the brushless outer rotor motor is not higher than 3500RPM, the output of the brushless outer rotor motorThe maximum value of the power output and the volume ratio is 4.5W/cm3。
3. The brushless external rotor electric machine according to claim 1, wherein: the magnetic pole is a tile magnetic pole made of ferrite materials and is composed of an outer arc, an inner arc and side edges which are bilaterally symmetrical and are connected with the outer arc and the inner arc, and the outer arc of the magnetic pole is attached to the inner wall of the machine shell.
4. The brushless external rotor electric machine according to claim 3, wherein: the inner arc of the magnetic pole of the outer rotor and the outer arc of the tooth groove of the inner stator are concentric circles, and an air gap exists between the inner arc of the magnetic pole and the outer arc of the tooth groove.
5. The brushless external rotor electric machine according to claim 1, wherein: the inner stator comprises a stator framework which is uniformly distributed along the circumferential direction, and a stator winding is arranged on the stator framework.
6. The brushless external rotor electric machine according to claim 5, wherein: the quantity of stator skeleton is 18, just the stator skeleton with the tooth's socket sets up at interval each other.
7. The brushless external rotor electric machine according to claim 5, wherein: when the brushless outer rotor motor rotates, the brushless outer rotor motor is provided with two groups of stator frameworks and magnetic poles, the central lines of the stator frameworks and the magnetic poles are respectively superposed, and the two groups of stator frameworks and the magnetic poles are respectively positioned at two radial ends of the axis of the rotating shaft.
8. The brushless external rotor electric machine according to claim 1, wherein: the casing of outer rotor is by the integrative stamping forming of metalwork, just the casing includes excircle lateral wall and is located the circular end wall of excircle lateral wall one end, the magnetic pole laminate in the inboard of excircle lateral wall.
9. The brushless external rotor electric machine of claim 8, wherein: the end wall is provided with a plurality of blades formed by outward blanking and through holes positioned at the blades, and the blades are uniformly distributed on the end wall along the circumferential direction to form fan blades together with the end wall.
10. The brushless external rotor electric machine according to any one of claims 1 to 9, wherein: the brushless outer rotor motor is applied to an air compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922415356.2U CN211089247U (en) | 2019-12-28 | 2019-12-28 | Brushless external rotor motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922415356.2U CN211089247U (en) | 2019-12-28 | 2019-12-28 | Brushless external rotor motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211089247U true CN211089247U (en) | 2020-07-24 |
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ID=71629801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922415356.2U Active CN211089247U (en) | 2019-12-28 | 2019-12-28 | Brushless external rotor motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211089247U (en) |
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2019
- 2019-12-28 CN CN201922415356.2U patent/CN211089247U/en active Active
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