CN220022578U - Permanent magnet motor - Google Patents
Permanent magnet motor Download PDFInfo
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- CN220022578U CN220022578U CN202321510230.3U CN202321510230U CN220022578U CN 220022578 U CN220022578 U CN 220022578U CN 202321510230 U CN202321510230 U CN 202321510230U CN 220022578 U CN220022578 U CN 220022578U
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- 230000005389 magnetism Effects 0.000 claims abstract description 13
- 238000002955 isolation Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Abstract
The utility model relates to a permanent magnet motor, which comprises a stator core and a rotor, wherein the stator core is sequentially provided with big teeth and small teeth at intervals along the circumferential direction, the big teeth and the small teeth are equal in number and uniformly distributed along the circumference, the tooth width of the big teeth is larger than that of the small teeth, the tooth top center of the big teeth is provided with a magnetism isolating slot, and the number of the big teeth, the small teeth and the number of magnetic poles of the rotor are regularly arranged according to the following steps: number of rotor poles N p =12+6x, large number of teeth N S ＝N S '/3; wherein N is S ′＝(N p +6+6y)/2, x is greater thanAnd y is an integer greater than or equal to 0. The utility model improves the output torque and the running stability of the motor under low-speed running, and avoids unbalanced stress of the rotor along the radial direction caused by uneven distribution of closed magnetic force lines formed between the stator teeth and the rotor magnetic poles along the circumferential direction.
Description
Technical Field
The utility model relates to the technical field of permanent magnet motors, in particular to a permanent magnet motor.
Background
The near-pole slot permanent magnet synchronous motor has the defects that the number of slots of a stator core is similar to the number of poles of a rotor, and the near-pole slot permanent magnet synchronous motor is very suitable for being applied to low-speed high-torque places, and the number of slots is correspondingly increased in the same proportion due to the low-speed requirement, so that winding is difficult. In order to meet the application requirements of low speed and large torque, the permanent magnet synchronous motor can be designed into a small-slot multipolar structure, namely, the number of slots (teeth) of a stator is far smaller than the number of poles of a rotor. However, the disadvantage is that the top of the stator teeth is wider due to the reduction of the number of slots, and the length of the stator teeth is similar to that of the rotor pole arc, so that a considerable part of flux linkage generated by the permanent magnet is directly closed through the top of the stator teeth to form a magnetic leakage magnetic circuit, thereby generating ineffective torque and reducing the utilization rate of the permanent magnet. In order to solve the problems, the method of arranging the 'magnetism isolating slot' at the tooth top position of the stator tooth breaks the closed magnetic leakage magnetic circuit, thereby solving the problems that the tooth top of the stator enters a saturated state too early and the torque output of the motor is weakened. In order to provide the magnetism isolating slot, the stator teeth are arranged in a mode of large and small tooth space parts.
In the prior art, the design concept aiming at the number of stator teeth with big teeth and the number of rotor poles is as follows: the number of teeth is designed to be a multiple of 3, and the number of poles is set to be 3 times of the number of teeth plus or minus 1, for example, a 9-slot 28-pole motor, namely, the stator teeth are 9, and the rotor magnetic shoe or the magnetic ring magnetic pole is 28. The design structure reduces the rotating speed of the motor and the number of grooves, thereby reducing the iron loss and increasing the torque of the motor. There are certain drawbacks to the 9 slot 28 pole motor windings having a specific winding form to create a specific electrical configuration: when the motor works, the three-phase windings on the stator iron core are electrified in a single electrifying period, so that closed magnetic lines formed between stator teeth and rotor magnetic poles are unevenly distributed along the circumferential direction, unbalance stress of the rotor along the radial direction is caused, and abnormal noise is generated by motor vibration. In summary, in the prior art, the number of stator teeth and the number of rotor poles are usually empirically set, which inherently has some electrical structure defects, and if directly used in a motor design having a structure of large teeth and small teeth and magnetic isolation slots, the product performance is affected.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a permanent magnet motor, and aims to improve the output torque of the motor under low-speed operation.
The technical scheme adopted by the utility model is as follows:
the utility model provides a permanent magnet motor, which comprises a stator core and a rotor, wherein the stator core is sequentially provided with big teeth and small teeth at intervals along the circumferential direction, the big teeth and the small teeth are equal in number and uniformly distributed along the circumference, the tooth width of the big teeth is larger than that of the small teeth, the center of the tooth top of the big teeth is provided with a magnetism isolating slot, and the number of the big teeth, the number of the small teeth and the number of magnetic poles of the rotor are as follows:
number of rotor poles N p =12+6x, large number of teeth N S ＝N S ′/3；
Wherein N is S ′＝(N p +6+6y)/2, x is an integer of 1 or more, and y is an integer of 0 or more.
The width of the magnetism isolating groove along the circumferential direction is 1/5-1/2 of the width of the tooth top end face of the big tooth along the circumferential direction.
The large tooth width is twice the tooth width of the small tooth.
The radial depth of the magnetism isolating groove is larger than 1mm.
The rotor adopts a magnetizing magnetic ring or a magnetic shoe structure.
The beneficial effects of the utility model are as follows:
the utility model starts from the electric structure principle, reasonably sets the number of teeth of the stator and the number of corresponding magnetic poles, provides a series of parameters of the number of teeth and the number of matched poles, and can design the motor with the same low-speed large-torque performance according to the design thought, thereby ensuring the consistency of the product quality.
The utility model improves the power density of the motor, has larger output torque when running at low speed below 1500rpm, and improves the performance of the motor running at low speed.
The utility model can ensure that the closed magnetic force lines formed between the stator teeth and the rotor magnetic poles are uniformly distributed along the circumferential direction, so that the rotor is balanced in radial stress, and abnormal noise generated by motor vibration is prevented.
Additional features and advantages of the utility model will be set forth in the description which follows, or may be learned by practice of the utility model.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present utility model.
In the figure: 1. large teeth; 2. small teeth; 3. a rotor; 4. a magnetism isolating groove; 5. a stator core.
Detailed Description
The following describes specific embodiments of the present utility model with reference to the drawings.
The utility model provides a permanent magnet motor, which comprises a stator core and a rotor, wherein the stator core is sequentially provided with big teeth and small teeth at intervals along the circumferential direction, the big teeth and the small teeth are equal in number and uniformly distributed along the circumference, the tooth width of the big teeth is larger than that of the small teeth, the center of the tooth top of the big teeth is provided with a magnetism isolating slot, and the number of the big teeth, the number of the small teeth and the number of magnetic poles of the rotor are as follows:
number of rotor poles: n (N) p ＝12+6x (1)；
Large number of teeth: n (N) S ＝N S ′/3 (2)；
Wherein N is S ′＝(N p +6+6y)/2 (3)；
Wherein x is an integer of 1 or more and y is an integer of 0 or more.
Specifically, the width of the magnetism isolating groove along the circumferential direction is 1/5-1/2 of the width of the tooth top end face of the big tooth along the circumferential direction.
Specifically, the large tooth width is twice the tooth width of the small tooth.
Specifically, the radial depth of the magnetism isolating groove is greater than 1mm.
Specifically, the rotor adopts a magnetizing magnetic ring or a magnetic shoe structure.
The permanent magnet motor of the present utility model is further described in the following specific examples.
Example 1
Referring to fig. 1, a 9-tooth 42-pole permanent magnet motor in the form of an outer rotor of the present embodiment includes a stator core 5 and a rotor 3 located outside the stator core 5, wherein the stator core 5 is sequentially provided with big teeth 1 and small teeth 2 at intervals along the circumferential direction, the number of big teeth is equal to the number of small teeth, the big teeth 1 are uniformly distributed along the circumference, the width of the big teeth 1 is greater than the width of the small teeth 2, and the center of the tooth top of the big teeth 1 is provided with a magnetism isolating slot 4, and the number of big teeth, the number of small teeth and the number of magnetic poles of the rotor are:
in the formula (1), x is 5, and in the formula (3), y is 1, namely N p ＝42，N S ＝9。
It will be appreciated that the values of x and y may be set according to the particular circumstances to obtain the corresponding number of teeth and poles.
Based on the electric structure principle, the utility model reasonably sets the number of the stator teeth and the corresponding number of the magnetic poles, and according to the design thought, a series of motors with the same low-speed large-torque performance can be obtained, and the consistency of the product quality is ensured.
The present utility model can also be provided in an inner rotor form different from the outer rotor form of embodiment 1.
Those of ordinary skill in the art will appreciate that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (5)
1. The utility model provides a permanent magnet machine, includes stator core and rotor, stator core is equipped with big tooth and tiny tooth along the circumferencial direction interval in proper order, and big, tiny tooth number volume is equal, all along circumference evenly distributed, big tooth width is greater than tiny tooth width, and big tooth's top central authorities are equipped with magnetism isolation groove, its characterized in that, big, tiny tooth quantity and rotor magnetic pole number satisfy:
number of rotor poles N p =12+6x, large number of teeth N S ＝N S ′/3；
Wherein N is S ′＝(N p +6+6y)/2, x is an integer of 1 or more, and y is an integer of 0 or more.
2. The permanent magnet motor of claim 1, wherein the width of the magnetism isolating slot in the circumferential direction is 1/5-1/2 of the width of the tip face of the large tooth in the circumferential direction.
3. The permanent magnet machine of claim 1 wherein the large tooth width is twice the tooth width of the small tooth.
4. The permanent magnet machine of claim 1 wherein the radial depth of the magnetically isolated slots is greater than 1mm.
5. The permanent magnet machine of claim 1 wherein the rotor is of a magnetically charged ring or shoe construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321510230.3U CN220022578U (en) | 2023-06-14 | 2023-06-14 | Permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321510230.3U CN220022578U (en) | 2023-06-14 | 2023-06-14 | Permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220022578U true CN220022578U (en) | 2023-11-14 |
Family
ID=88680102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321510230.3U Active CN220022578U (en) | 2023-06-14 | 2023-06-14 | Permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220022578U (en) |
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2023
- 2023-06-14 CN CN202321510230.3U patent/CN220022578U/en active Active
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