CN216751345U - Permanent magnet motor capable of reducing cogging torque ripple - Google Patents
Permanent magnet motor capable of reducing cogging torque ripple Download PDFInfo
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- CN216751345U CN216751345U CN202123281868.8U CN202123281868U CN216751345U CN 216751345 U CN216751345 U CN 216751345U CN 202123281868 U CN202123281868 U CN 202123281868U CN 216751345 U CN216751345 U CN 216751345U
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- permanent magnet
- trapezoidal
- cogging torque
- torque ripple
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Abstract
The utility model provides a can reduce permanent-magnet machine of cogging torque pulsation, its includes stator part, permanent magnet and rotor part, the rotor part is installed at stator part center, and the outer disc of rotor part forms the air gap with the interior cambered surface of stator part, the cross-section of permanent magnet is isosceles trapezoid, and the permanent magnet is fixed in the rotor part and the radius line of permanent magnet central line and rotor part is unanimous, the magnetic force line path of permanent magnet forms 90 contained angles for using the permanent magnet central line as the benchmark to central line both sides symmetric distribution and respectively with trapezoidal left surface of permanent magnet and trapezoidal right flank, and trapezoidal left surface of permanent magnet and trapezoidal right flank form the contained angle with the permanent magnet central line respectively. The utility model discloses a change the shape of permanent magnet to can reduce permanent-magnet machine's tooth's socket torque pulsation, reduce vibration and noise by tooth's socket torque pulsation arouse, reduce the rotational speed and fluctuate, make permanent-magnet machine operate steadily.
Description
Technical Field
The utility model relates to a permanent-magnet machine especially relates to a permanent-magnet machine that can reduce tooth's socket torque pulsation.
Background
As shown in fig. 1 to 3, an existing permanent magnet motor generally includes a stator component, a permanent magnet and a rotor component, the permanent magnet used in the existing permanent magnet motor has a substantially rectangular cross section, the permanent magnets are N-pole permanent magnets and S-pole permanent magnets, the N-pole permanent magnets and the S-pole permanent magnets are alternately fixed in the rotor component, the permanent magnet motor has large cogging torque ripple, and the cogging torque ripple causes the permanent magnet motor to generate vibration and noise, and the rotation speed ripple occurs, so that the permanent magnet motor cannot run stably, and the performance of the permanent magnet motor is affected. Especially in variable speed drives, when the cogging torque ripple frequency coincides with the mechanical resonance frequency of the stator or rotor, the vibrations and noise generated by the cogging torque will also be amplified. Also, the presence of cogging torque ripple also affects the low speed performance of permanent magnet motors in speed control systems and the high accuracy positioning of permanent magnet motors in position control systems.
Disclosure of Invention
The utility model aims to solve the technical problem that the aforesaid is not enough and provide a permanent-magnet machine that can reduce tooth's socket torque pulsation to prior art, it has less tooth's socket torque pulsation and vibration noise.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a can reduce permanent-magnet machine of cogging torque ripple, its includes stator part, permanent magnet and rotor part, the rotor part is installed at stator part center, and the outer disc of rotor part forms the air gap with the intrados of stator part, its characterized in that: the section of the permanent magnet is isosceles trapezoid, the permanent magnet is fixed in the rotor component, the central line of the permanent magnet is consistent with the radius line of the rotor component, the magnetic line path of the permanent magnet is symmetrically distributed towards the two sides of the central line by taking the central line of the permanent magnet as a reference and forms an included angle of 90 degrees with the trapezoidal left side surface and the trapezoidal right side surface of the permanent magnet respectively, and the trapezoidal left side surface and the trapezoidal right side surface of the permanent magnet respectively form an included angle with the central line of the permanent magnet.
Preferably, the included angle is 5-20 degrees, and more preferably 8 degrees.
Preferably, the permanent magnets are fixed in trapezoidal grooves of the rotor part.
Preferably, the top and bottom of the trapezoidal groove of the rotor part are respectively provided with a top window and a bottom window, so that the magnetic isolation effect is achieved, and magnetic leakage is reduced.
Preferably, the trapezoidal left surface and the trapezoidal right surface of the permanent magnet are respectively attached and fixed on the left surface and the right surface of the trapezoidal groove of the rotor component.
Preferably, the trapezoidal left side surface and the trapezoidal right side surface of the permanent magnet are respectively adhered to the left side surface and the right side surface of the trapezoidal groove of the rotor component through adhesives.
Preferably, the permanent magnet is of a split structure, is split along the center line and consists of a left permanent magnet part and a right permanent magnet part, and thus, the permanent magnet is convenient to manufacture.
More specifically, the permanent magnets are an N-pole permanent magnet and an S-pole permanent magnet, and the N-pole permanent magnet and the S-pole permanent magnet are alternately fixed in the rotor component.
Compared with the prior art, the utility model has the advantages of: by changing the shape of the permanent magnet, the magnetic force line paths are symmetrically distributed towards both sides of the central line by taking the central line of the permanent magnet as a reference and form an included angle of 90 degrees with the trapezoidal left side surface and the trapezoidal right side surface of the permanent magnet respectively, and the trapezoidal left side surface and the trapezoidal right side surface of the permanent magnet form an included angle with the central line of the permanent magnet, so that the cogging torque pulsation of the permanent magnet motor can be reduced, the vibration and noise caused by the cogging torque pulsation are reduced, the rotation speed fluctuation is reduced, the permanent magnet motor runs stably, and the low-speed performance of the permanent magnet motor in a speed control system and the high-precision positioning in a position control system are improved.
Drawings
Fig. 1 is a cross-sectional view of a prior art permanent magnet motor.
Fig. 2a and 2b are schematic diagrams of the magnetizing direction of a permanent magnet of a conventional permanent magnet motor.
Fig. 3 is a magnetic force line distribution diagram of the conventional permanent magnet motor.
Fig. 4 is a schematic cross-sectional view of a permanent magnet motor according to embodiment 1 of the present invention, which can reduce cogging torque ripple.
Fig. 5a and 5b are schematic diagrams of magnetic lines and magnetizing directions of permanent magnets in embodiment 1 of the present invention.
Fig. 6 is a magnetic force line distribution diagram of a permanent magnet motor according to embodiment 1 of the present invention, which can reduce cogging torque ripple.
Fig. 7 is a schematic cross-sectional view of a permanent magnet motor according to embodiment 2 of the present invention, which can reduce cogging torque ripple.
Fig. 8a and 8b are schematic diagrams of magnetic lines and magnetizing directions of permanent magnets in embodiment 2 of the present invention.
Fig. 9 is a magnetic force line distribution diagram of a permanent magnet motor according to embodiment 2 of the present invention, which can reduce cogging torque ripple.
Fig. 10 is a cogging torque ripple waveform graph of a conventional permanent magnet motor.
Fig. 11 is a graph showing a cogging torque ripple waveform according to embodiment 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 4 and 5, a permanent magnet motor capable of reducing cogging torque ripple includes a stator part 10, N-pole permanent magnets 20, S-pole permanent magnets 30, and a rotor part 40.
The rotor part 40 is mounted centrally on the stator part 10, with the outer circular surface 405 of the rotor part forming an air gap with the inner curved surface 101 of the stator part.
The section of the N-pole permanent magnet 20 is isosceles trapezoid, the left side surface 201 and the right side surface 202 of the N-pole permanent magnet are respectively attached to and fixed with the left side surface and the right side surface of the trapezoidal groove formed in the rotor component, and the N-pole permanent magnet is more firmly fixed in the trapezoidal groove of the rotor component by using adhesive attachment.
The N-pole permanent magnet 20 is fixed in the trapezoidal groove of the rotor component, and the center line C of the N-pole permanent magnet is consistent with the radius line R of the rotor component.
The magnetic line W path of the N-pole permanent magnet is symmetrically distributed towards the two sides of the center line C by taking the center line C of the N-pole permanent magnet as a reference, and forms an included angle of 90 degrees with the trapezoidal left side surface and the trapezoidal right side surface of the N-pole permanent magnet respectively, and the direction of the magnetic line W path is determined by the magnetizing direction.
The included angle between the trapezoidal left side surface 201 and the trapezoidal right side surface 202 of the N-pole permanent magnet and the central line C of the permanent magnet is L, and the included angle L in this embodiment is 8 °.
Similarly, the S-pole permanent magnet 30 and the N-pole permanent magnet are identical to the N-pole permanent magnet in structure and fixed to the rotor member in the same manner except that the directions of the paths of the magnetic lines W are opposite, i.e., the magnetizing directions are opposite.
The included angle between the trapezoidal left side surface 301 and the trapezoidal right side surface 302 of the S-pole permanent magnet and the central line C of the permanent magnet is L, and the included angle L in this embodiment is 8 °.
As shown in fig. 6, the magnetic line W of force of the N-pole permanent magnet of the permanent magnet motor capable of reducing cogging torque ripple enters the rotor component from the left side surface of the trapezoid, flows to the air gap after passing through the rotor component, enters the inner arc surface of the stator component after passing through the air gap, flows to the inner arc surface after passing through the stator component, enters the rotor component after passing through the air gap again, and returns to the right side surface of the trapezoid of the N-pole permanent magnet, thereby forming complete magnetic line loop distribution.
Similarly, the magnetic line loops of the S-pole permanent magnet and the N-pole permanent magnet are distributed in the same way as the magnetic line loops of the N-pole permanent magnet except that the magnetic line enters the rotor part from the right trapezoidal side surface of the S-pole permanent magnet and finally returns to the left trapezoidal side surface of the S-pole permanent magnet.
As shown in fig. 10 and 11, the permanent magnet of the conventional permanent magnet motor has a rectangular cross section, and the maximum peak Tmax =2.954n.m in the cogging torque ripple waveform of the motor, in the permanent magnet motor capable of reducing the cogging torque ripple of embodiment 1, the included angles between the trapezoidal left side surface and the trapezoidal right side surface of the permanent magnet and the center line C of the permanent magnet are 8 °, the maximum peak Tmax =0.545n.m in the cogging torque ripple waveform of the motor, and the cogging torque ripple reduction ratio is as follows: the reduction ratio of the cogging torque ripple is = (2.954-0.545) ÷ 2.954 × 100% =81.55%, the reduction of the cogging torque ripple of the permanent magnet motor is realized, the vibration and noise caused by the cogging torque ripple are reduced, the rotation speed fluctuation is reduced, the motor runs stably, the low-speed performance of the motor in a speed control system and the high-precision positioning in a position control system are improved, and the use requirement is met.
The utility model discloses still study trapezoidal left surface of permanent magnet and trapezoidal right flank respectively with permanent magnet central line C's contained angle L, the change picture of the motor tooth's socket torque ripple of this embodiment and time is seen in figure 11, and the relation between contained angle L change and the motor tooth's socket torque ripple sees table 1, can know by table 1, and the contained angle preferred is 5 ~ 20, is 8 better.
TABLE 1 relationship table of included angle L between trapezoidal left/right side surface of permanent magnet and center line and motor cogging torque ripple
Example 2
As shown in fig. 7 to 9, in another permanent magnet motor capable of reducing cogging torque ripple, the permanent magnet is a split type, and the other structures are completely the same as those of the permanent magnet motor of embodiment 1.
More specifically, the permanent magnet is divided into an N-pole permanent magnet and an S-pole permanent magnet, the N-pole permanent magnet is composed of an N-pole permanent magnet left portion 20A and an N-pole permanent magnet right portion 20B, and the S-pole permanent magnet is composed of an S-pole permanent magnet left portion 30A and an S-pole permanent magnet right portion 30B.
The split type N pole permanent magnet is separated along the central line thereof and is formed by bonding the left part of the N pole permanent magnet and the right part of the N pole permanent magnet, the magnetizing direction of the left part of the N pole permanent magnet is from the central line C to the trapezoidal left side surface 20A1 and forms an included angle of 90 degrees with the trapezoidal left side surface 20A1, the trapezoidal left side surface 20A1 forms an included angle L with the central line C, the magnetizing direction of the right part of the N pole permanent magnet is from the trapezoidal right side surface 20B1 to the central line C and forms an included angle of 90 degrees with the trapezoidal right side surface, and the trapezoidal right side surface forms an included angle L with the central line, so that the structure can more conveniently magnetize the left part of the N pole permanent magnet and the right part of the N pole permanent magnet, as shown in figure 8 a.
Similarly, the split-type S-pole permanent magnet 30 is separated along the center line thereof and is formed by bonding the left part 30A of the S-pole permanent magnet and the right part 30B of the S-pole permanent magnet, and the rest of the split-type S-pole permanent magnet is completely the same as the left part and the right part of the N-pole permanent magnet except for the opposite magnetizing directions.
The magnetizing direction of the left part of the split type S-pole permanent magnet is from the trapezoidal left side face 30A1 to the center line C, and forms an included angle of 90 degrees with the trapezoidal left side face 30A1, the trapezoidal left side face 30A1 forms an included angle L with the center line C, the magnetizing direction of the right part of the S-pole permanent magnet is from the center line C to the trapezoidal right side face 30B1, and forms an included angle of 90 degrees with the trapezoidal right side face 30B1, the trapezoidal right side face forms an included angle L with the center line C, and the structure can more conveniently magnetize the left part of the N-pole permanent magnet and the right part of the N-pole permanent magnet, as shown in fig. 8B.
The distribution of the magnetic lines of the permanent magnet motor is shown in fig. 9, which is identical to that of embodiment 1.
The performance of the permanent magnet machine described above is the same as that of example 1.
It should be noted that the left and right directional terms and the words containing the directional terms used in the present embodiment and the present application are used for convenience of description, and are only used for the specific directions determined during the description, and do not limit the scope and content of the present invention.
Claims (10)
1. The utility model provides a can reduce permanent-magnet machine of cogging torque ripple, its includes stator part, permanent magnet and rotor part, the rotor part is installed at stator part center, and the outer disc of rotor part forms the air gap with the intrados of stator part, its characterized in that: the section of the permanent magnet is isosceles trapezoid, the permanent magnet is fixed in the rotor component, the central line of the permanent magnet is consistent with the radius line of the rotor component, the magnetic line path of the permanent magnet is symmetrically distributed towards the two sides of the central line by taking the central line of the permanent magnet as a reference and forms an included angle of 90 degrees with the trapezoidal left side surface and the trapezoidal right side surface of the permanent magnet respectively, and the trapezoidal left side surface and the trapezoidal right side surface of the permanent magnet respectively form an included angle with the central line of the permanent magnet.
2. The permanent magnet motor capable of reducing cogging torque ripple of claim 1, wherein: the included angle is 10-45 degrees.
3. The permanent magnet motor capable of reducing cogging torque ripple of claim 2, wherein: the included angle is 18 °.
4. The permanent magnet motor capable of reducing cogging torque ripple of claim 1, wherein: the permanent magnets are fixed in the trapezoidal grooves of the rotor component.
5. The permanent magnet motor capable of reducing cogging torque ripple of claim 4, wherein: the trapezoidal left side of permanent magnet and trapezoidal right flank are laminated respectively and are fixed on the left surface and the right surface of rotor part dovetail groove.
6. The permanent magnet motor capable of reducing cogging torque ripple of claim 5, wherein: the trapezoidal left side surface and the trapezoidal right side surface of the permanent magnet are respectively stuck to the left side surface and the right side surface of the trapezoidal groove of the rotor component through adhesives.
7. The permanent magnet motor capable of reducing cogging torque ripple of claim 4, wherein: the top and bottom of the trapezoidal groove of the rotor part are respectively provided with a top window and a bottom window.
8. The permanent magnet motor capable of reducing cogging torque ripple of claim 1, wherein: the top and bottom of the trapezoidal groove of the rotor part are respectively provided with a top window and a bottom window.
9. The permanent magnet motor capable of reducing cogging torque ripple of claim 1, wherein: the permanent magnet is of a split structure, is separated along a central line and consists of a left permanent magnet part and a right permanent magnet part.
10. The permanent magnet motor capable of reducing cogging torque ripple of claim 1, wherein: the permanent magnets are N-pole permanent magnets and S-pole permanent magnets, and the N-pole permanent magnets and the S-pole permanent magnets are alternately fixed in the rotor component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123281868.8U CN216751345U (en) | 2021-12-24 | 2021-12-24 | Permanent magnet motor capable of reducing cogging torque ripple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123281868.8U CN216751345U (en) | 2021-12-24 | 2021-12-24 | Permanent magnet motor capable of reducing cogging torque ripple |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216751345U true CN216751345U (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123281868.8U Active CN216751345U (en) | 2021-12-24 | 2021-12-24 | Permanent magnet motor capable of reducing cogging torque ripple |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216751345U (en) |
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2021
- 2021-12-24 CN CN202123281868.8U patent/CN216751345U/en active Active
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