CN213305079U - Rotor structure and permanent magnet synchronous motor - Google Patents
Rotor structure and permanent magnet synchronous motor Download PDFInfo
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- CN213305079U CN213305079U CN202021859720.0U CN202021859720U CN213305079U CN 213305079 U CN213305079 U CN 213305079U CN 202021859720 U CN202021859720 U CN 202021859720U CN 213305079 U CN213305079 U CN 213305079U
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- magnetic steel
- magnetism isolating
- steel groove
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Abstract
The utility model discloses a rotor structure, a magnetic steel groove group which is circumferentially and uniformly arranged around an axle center hole is arranged on a rotor punching sheet, and the magnetic steel groove group comprises a first magnetic steel groove and a second magnetic steel groove; two circular magnetism isolating grooves are correspondingly arranged on the outer sides of each first magnetic steel groove and each second magnetic steel groove, the two circular magnetism isolating grooves on the outer side of the first magnetic steel groove in each magnetic steel groove group and the two circular magnetism isolating grooves on the outer side of the second magnetic steel groove in each magnetic steel groove group are symmetrically arranged along the d axis, and the two circular magnetism isolating grooves are respectively a first circular magnetism isolating groove and a second circular magnetism isolating groove; the radius of the first circular magnetism isolating groove is R1, the radius of the second circular magnetism isolating groove is R2, the distance between the centers of the two first circular magnetism isolating grooves in each magnetic steel groove group is L, the distance between the centers of the two second circular magnetism isolating grooves in each magnetic steel groove group is T, R1 is more than or equal to 0.1T and less than or equal to 0.2T, and R2 is more than or equal to 0.2L and less than or equal to 0.3L. The utility model discloses still disclose a PMSM. The punching sheet and the motor can obviously improve the magnetic field concentration and reduce the full-load high-order noise when the motor operates.
Description
Technical Field
The utility model relates to a new forms of energy pure electric vehicles driving motor technical field especially relates to a rotor structure and PMSM.
Background
The driving motor is used as a driving core of the new-energy pure electric vehicle and is also one of main noise sources of the new-energy pure electric vehicle. The noise source of the driving motor comprises mechanical noise and electromagnetic noise, wherein the mechanical noise is mainly caused by vibration of mechanical structural parts such as bearings and the like and the inherent vibration frequency of the motor body; electromagnetic noise is mainly caused by the torque ripple of the motor and the radial force waves generated in the air gap magnetic field. In the actual use process of the driving motor for the new energy automobile, high-order radial force waves generated by an air gap magnetic field of the driving motor at a high rotating speed are difficult to weaken, so that strong electromagnetic noise is generated in the high-speed operation process of the driving motor, and poor user experience is brought to a vehicle driver and a passenger, so that the harmonic content of the driving motor is weakened, the electromagnetic force waves are optimized, the electromagnetic noise at a high speed is reduced, and good vehicle using experience is created for a user, and the driving motor is one of important contents of the design of the driving motor for the new energy pure electric automobile.
Disclosure of Invention
The utility model aims at providing a rotor structure and PMSM can obviously improve the magnetic field and concentrate, reduces motor high-order torque ripple, weakens the radial force density of each order, reduces the full load high-order noise when motor operation.
In order to achieve the above object, the present invention provides a rotor structure, which includes a rotor core formed by laminating a plurality of rotor sheets, wherein the rotor sheets are provided with an axial hole and a magnetic steel slot group circumferentially and uniformly arranged around the axial hole, the magnetic steel slot group includes a first magnetic steel slot and a second magnetic steel slot, and each of the first magnetic steel slot and the second magnetic steel slot contains a first permanent magnet and a second permanent magnet respectively;
two circular magnetism isolating grooves are correspondingly arranged on the outer sides of each first magnetic steel groove and each second magnetic steel groove, two circular magnetism isolating grooves on the outer sides of the first magnetic steel grooves and two circular magnetism isolating grooves on the outer sides of the second magnetic steel grooves in each magnetic steel groove group are symmetrically arranged along the corresponding d axes, and the two circular magnetism isolating grooves are respectively a first circular magnetism isolating groove and a second circular magnetism isolating groove; the radius of the first circular magnetism isolating groove is R1, the radius of the second circular magnetism isolating groove is R2, the distance between the centers of the two first circular magnetism isolating grooves in each magnetic steel groove group is L, the distance between the centers of the two second circular magnetism isolating grooves in each magnetic steel groove group is T, R1 is more than or equal to 0.1T and less than or equal to 0.2T, and R2 is more than or equal to 0.2L and less than or equal to 0.3L.
Further, the first magnetic steel groove and the second magnetic steel groove in each magnetic steel groove group are arranged in a V shape, and the tip of the V shape faces the axle center hole.
The utility model also provides a PMSM, include the rotor structure.
Further, the permanent magnet synchronous motor is an integer slot motor.
Compared with the prior art, the utility model has the following advantage:
the rotor structure and the permanent magnet synchronous motor of the utility model do not increase the process difficulty, modify the iron core die to a great extent and simultaneously meet the strength of the rotor punching sheet; two circular magnetism isolating grooves which are symmetrical about the axis d are arranged on the rotor punching sheet, so that electromagnetic force waves and torque pulsation can be weakened; meanwhile, by adjusting the sizes of R1 and R2, the magnetic field concentration can be obviously improved, the magnetic flux condition of a d axis can be better improved, the smooth distribution of the magnetic flux of the d axis is ensured, the high-order torque fluctuation of the motor is reduced, the radial force density of each order is reduced, and the full-load high-order noise during the operation of the motor is reduced; meanwhile, the structure of the magnetic steel slot group is V-shaped, so that electromagnetic waves and torque pulsation can be further weakened.
Drawings
FIG. 1 is a schematic structural view of the whole stator and rotor of the motor of the present invention;
FIG. 2 is a partial enlarged view of the rotor sheet of the present invention;
FIG. 3 is a scatter plot of motor torque ripple as a function of optimized motor parameters;
FIG. 4 is a graph illustrating the trend of electromagnetic force according to an embodiment of the present invention;
FIG. 5 is a torque ripple trend graph illustrating an embodiment of the present invention;
fig. 6 is a comparison graph of radial force density for an embodiment of the present invention;
fig. 7 is a diagram comparing near field noise data of a motor according to an embodiment of the present invention.
In the figure:
1-rotor punching sheet, 11-axle center hole, 12-first magnetic steel groove, 13-second magnetic steel groove, 14-first circular magnetism isolating groove, 15-second circular magnetism isolating groove; 3-rotor core.
Detailed Description
The following describes the present invention with reference to the accompanying drawings.
For a 48-slot 8-pole permanent magnet synchronous motor, a tooth part of a stator is not generally selected to be used as an article for ensuring the optimization effect, the tooth part is relatively narrow, the number of teeth is large, the actual development of production is not facilitated, the service life of a die is prolonged, and the rotor punching sheet is selected to be designed under the condition that the process complexity is not increased and the die opening cost of the die is not increased.
Referring to fig. 1 and 2, the embodiment discloses a rotor structure, which includes a rotor core 3 formed by laminating a plurality of rotor laminations 1, where the rotor laminations 1 are provided with a shaft center hole 11 and a magnetic steel slot group uniformly arranged around the shaft center hole 11 in the circumferential direction, the magnetic steel slot group includes a first magnetic steel slot 12 and a second magnetic steel slot 13, and each of the first magnetic steel slot 12 and the second magnetic steel slot 13 accommodates a first permanent magnet and a second permanent magnet respectively;
two circular magnetism isolating grooves are correspondingly arranged on the outer sides of each first magnetic steel groove 12 and each second magnetic steel groove 13, two circular magnetism isolating grooves on the outer side of the first magnetic steel groove 12 in each magnetic steel groove group and two circular magnetism isolating grooves on the outer side of the second magnetic steel groove 13 in each magnetic steel groove group are symmetrically arranged along the corresponding d axis, and the two circular magnetism isolating grooves are a first circular magnetism isolating groove 14 and a second circular magnetism isolating groove 15 respectively; the radius of the first circular magnetism isolating groove 14 is R1, the radius of the second circular magnetism isolating groove 15 is R2, the distance between the centers of the two first circular magnetism isolating grooves 14 in each magnetic steel groove group is L, the distance between the centers of the two second circular magnetism isolating grooves 15 in each magnetic steel groove group is T, R1 is more than or equal to 0.1T and less than or equal to 0.2T, and R2 is more than or equal to 0.2L and less than or equal to 0.3L. The d-axis is the axis between the permanent magnets of each magnet pair with a symmetrical polarity arrangement.
In the present embodiment, the first magnetic steel slot 12 and the second magnetic steel slot 13 in each magnetic steel slot group are arranged in a "V" shape, and the tip of the "V" shape faces the axle hole 11.
The embodiment discloses a permanent magnet synchronous motor which comprises the rotor structure.
In this embodiment, the permanent magnet synchronous motor is an integer slot motor. The number of slots per phase per pole is:
n is the number of stator slots, and p is the number of rotor pole pairs.
Referring to fig. 4, as a new energy automobile permanent magnet type rotation driving motor having a more severe requirement for NVH, noise is generated due to electromagnetic force. The rotor punching sheet is provided with two permanent magnetic grooves, the magnetic field direction of the air-gap magnetic field can be changed, the harmonic content in the air-gap magnetic field is reduced, the air-gap magnetic density waveform is closer to a sine wave, and the radial force density of each order is reduced.
Referring to fig. 3 and 5, simulation results show that on the premise of ensuring the strength of the rotor sheet, two circular magnetic isolation grooves, namely a first circular magnetic isolation groove 14 and a second circular magnetic isolation groove 15, are arranged, and the sizes of R1 and R2 are adjusted, so that magnetic field concentration can be obviously improved, the magnetic flux condition of a d axis can be better improved, the magnetic flux distribution of the d axis is ensured to be smoother, high-order torque fluctuation of a motor is reduced, radial force density of each order is weakened, and full-load high-order noise of the motor during operation is reduced.
Referring to fig. 6, the radial force density obtained through simulation is reduced to a certain extent compared with the radial force density of the original scheme, so that the actual NVH performance of the whole vehicle can be reflected.
Referring to fig. 7, through the actual NVH objective test of the finished automobile by manufacturing the motor, it can be seen that the decibel value can be reduced by at least 5dB and can be reduced by about 10dB at about 6500rpm compared with the original scheme by collecting the near-field noise data of the motor.
The rotor structure and the permanent magnet synchronous motor of the utility model do not increase the process difficulty, modify the iron core die to a great extent and simultaneously meet the strength of the rotor punching sheet; two circular magnetism isolating grooves which are symmetrical about the axis d are arranged on the rotor punching sheet, so that electromagnetic force waves and torque pulsation can be weakened; meanwhile, by adjusting the sizes of R1 and R2, the magnetic field concentration can be obviously improved, the magnetic flux condition of a d axis can be better improved, the smooth distribution of the magnetic flux of the d axis is ensured, the high-order torque fluctuation of the motor is reduced, the radial force density of each order is reduced, and the full-load high-order noise during the operation of the motor is reduced; meanwhile, the structure of the magnetic steel slot group is V-shaped, so that electromagnetic waves and torque pulsation can be further weakened.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (4)
1. A rotor structure comprises a rotor core (3) formed by laminating a plurality of rotor punching sheets (1), wherein the rotor punching sheets (1) are provided with a shaft center hole (11) and a magnetic steel groove group which is uniformly arranged around the shaft center hole (11) in the circumferential direction, the magnetic steel groove group comprises a first magnetic steel groove (12) and a second magnetic steel groove (13), and a first permanent magnet and a second permanent magnet are respectively accommodated in each first magnetic steel groove (12) and each second magnetic steel groove (13); it is characterized in that the preparation method is characterized in that,
two circular magnetism isolating grooves are correspondingly arranged on the outer sides of each first magnetic steel groove (12) and each second magnetic steel groove (13), the two circular magnetism isolating grooves on the outer side of the first magnetic steel groove (12) in each magnetic steel groove group and the two circular magnetism isolating grooves on the outer side of the second magnetic steel groove (13) in each magnetic steel groove group are symmetrically arranged along the corresponding d axis, and the two circular magnetism isolating grooves are a first circular magnetism isolating groove (14) and a second circular magnetism isolating groove (15) respectively; the radius of the first circular magnetism isolating groove (14) is R1, the radius of the second circular magnetism isolating groove (15) is R2, the distance between the centers of circles of the two first circular magnetism isolating grooves (14) in each magnetic steel groove group is L, the distance between the centers of circles of the two second circular magnetism isolating grooves (15) in each magnetic steel groove group is T, R1 is more than or equal to 0.1T and less than or equal to 0.2T, and R2 is more than or equal to 0.2L and less than or equal to 0.3L.
2. A rotor structure according to claim 1, characterised in that the first magnet steel slot (12) and the second magnet steel slot (13) in each magnet steel slot group are arranged in a "V" shape with the tip of the "V" shape facing the hub hole (11).
3. A permanent magnet synchronous machine comprising a rotor structure according to any of claims 1-2.
4. The permanent magnet synchronous motor of claim 3, wherein the permanent magnet synchronous motor is an integer slot motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021859720.0U CN213305079U (en) | 2020-08-31 | 2020-08-31 | Rotor structure and permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021859720.0U CN213305079U (en) | 2020-08-31 | 2020-08-31 | Rotor structure and permanent magnet synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213305079U true CN213305079U (en) | 2021-05-28 |
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ID=76029382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021859720.0U Active CN213305079U (en) | 2020-08-31 | 2020-08-31 | Rotor structure and permanent magnet synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213305079U (en) |
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2020
- 2020-08-31 CN CN202021859720.0U patent/CN213305079U/en active Active
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| CP01 | Change in the name or title of a patent holder |
Address after: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee after: Deep Blue Automotive Technology Co.,Ltd. Address before: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee before: CHONGQING CHANGAN NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |