CN112821618B - Segmented eccentric integrated magnetic pole structure of hub motor - Google Patents
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- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
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- 229910052761 rare earth metal Inorganic materials 0.000 description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- 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
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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- 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
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Abstract
A segmented eccentric integrated magnetic pole structure of an in-wheel motor belongs to the technical field of in-wheel motors. The invention solves the problems that the prior art can not simultaneously solve the problems of overhigh cost and overlarge torque pulsation caused by excessive permanent magnet consumption and larger air gap flux density harmonic content in the hub motor. The number of the permanent magnet auxiliary magnetic poles and the number of the ferrite auxiliary magnetic poles are two, the two permanent magnet auxiliary magnetic poles are symmetrically arranged at two ends of the permanent magnet main magnetic pole, and the two ferrite auxiliary magnetic poles are symmetrically arranged and are respectively positioned at one ends, far away from the permanent magnet main magnetic pole, of the two permanent magnet auxiliary magnetic poles; the main magnetic pole and the auxiliary magnetic pole of the permanent magnet are eccentrically cut, wherein the inner arc and the outer arc of the main magnetic pole of the permanent magnet and the inner arc and the outer arc of the auxiliary magnetic pole of the permanent magnet are eccentrically arranged, the inner arc and the outer arc of the auxiliary magnetic pole of the ferrite are concentrically arranged, and the center of the inner circle of the main magnetic pole of the permanent magnet, the center of the inner circle of the auxiliary magnetic pole of the permanent magnet and the center of the inner circle of the auxiliary magnetic pole of the ferrite coincide.
Description
Technical Field
The invention relates to a segmented eccentric integrated magnetic pole structure of a hub motor, and belongs to the technical field of hub motors.
Background
Electric vehicles are increasingly popular with scientific research institutions and automobile manufacturers due to their advantages of zero emission and no pollution. With the vigorous support of governments in the technical research and development field and the product consumption link, electric vehicles have entered the batch industrialization stage. And the driving motor is used as the heart of the electric automobile, so that the performance of the electric automobile and the driving experience of an automobile owner are directly determined. Among a plurality of electric automobile driving motors, the speed reduction driving hub motor has the advantages of small occupied space and high system efficiency, and can directly inherit a vehicle braking device and a driving device. Therefore, the research on the speed reduction driving hub motor has important significance for promoting the further development of the electric automobile. The hub motor is used as a core component of the electric automobile, and the cost of the hub motor directly determines the price of the whole electric automobile. Meanwhile, the running of the electric automobile is directly driven by the hub motor, so the size of the output torque pulsation of the motor directly determines the running stability of the electric automobile. In the traditional hub motor, because the air gap magnetic field is in trapezoidal distribution, the torque pulsation of the motor is large, and the driving experience of a vehicle is directly influenced. In conclusion, cost and torque ripple are important bottlenecks limiting further popularization of the hub motor in the field of electric automobiles.
In order to solve the problems of high cost and large torque ripple in the speed reduction driving hub motor, research institutions at home and abroad carry out a great deal of research on the method. Patent [ application No.: CN105449968A ] proposes an integrated magnetic pole structure (as shown in fig. 5), which reduces the amount of permanent magnets by integrating ferrite cores and permanent magnets, and achieves the purpose of reducing cost. However, the integrated magnetic pole structure reduces the amplitude of the air gap fundamental wave flux density, so that the output torque of the motor is reduced to some extent, and meanwhile, the torque pulsation of the motor cannot be inhibited. Patent [ application No.: CN108347113A ] proposes a magnetic pole structure for double-layer integration, which reduces the torque ripple of the motor by using Halbach permanent magnet arrays with different magnetizing directions. But the structure further increases the cost of the motor due to the use of the double-layer permanent magnet. The document [ MEESSEN.K.J.et al.Halbach permanent magnet shape selection for slotted tubular actuators [ J ]. IEEE Transactions on Magnetics,2008] proposes a magnetic pole structure using segmented Halbach array permanent magnets, which can effectively reduce harmonics in the air gap flux density, thereby suppressing torque ripple. In addition, the output torque of the motor can be improved. However, this structure also uses a large number of permanent magnets, making the cost of the motor prohibitive. A sine optimization model of an air gap magnetic field of an eccentric magnetic pole permanent magnet motor [ J ] electrotechnical journal, 2019, v.34 (18): 41-50 ] is disclosed in a document [ Hupenfei, wangdong, jenbao, and the like ], and an eccentric pole-cutting type magnetic pole structure (shown in figure 4) is provided, so that the harmonic content in the air gap magnetic density is reduced by changing the arc eccentricity of the upper surface of a permanent magnet and the pole arc coefficient of the permanent magnet, and the torque pulsation is effectively reduced. However, after the permanent magnet magnetic poles are eccentrically trimmed, the leakage magnetic field of the motor increases, so that the copper loss in the motor increases, and the output torque and transmission efficiency of the motor are reduced. In summary, the existing research cannot simultaneously solve the disadvantages of high cost and large torque ripple in the speed reduction driving type hub motor.
Disclosure of Invention
The invention aims to solve the problems that the prior art cannot simultaneously solve the problems of overhigh cost and overlarge torque pulsation caused by excessive permanent magnet consumption and large air gap flux density harmonic content in a hub motor, and further provides a segmented eccentric integrated magnetic pole structure of the hub motor.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a segmented eccentric integrated magnetic pole structure of an in-wheel motor comprises permanent magnet main magnetic poles, permanent magnet auxiliary magnetic poles and ferrite auxiliary magnetic poles, wherein the number of the permanent magnet auxiliary magnetic poles and the ferrite auxiliary magnetic poles is two, the two permanent magnet auxiliary magnetic poles are symmetrically arranged at two ends of the permanent magnet main magnetic poles, and the two ferrite auxiliary magnetic poles are symmetrically arranged and are respectively positioned at one ends, far away from the permanent magnet main magnetic poles, of the two permanent magnet auxiliary magnetic poles;
the main magnetic pole and the auxiliary magnetic pole of the permanent magnet are eccentrically cut, wherein the inner arc and the outer arc of the main magnetic pole of the permanent magnet and the inner arc and the outer arc of the auxiliary magnetic pole of the permanent magnet are eccentrically arranged, the inner arc and the outer arc of the auxiliary magnetic pole of the ferrite are concentrically arranged, the center of the inner circle of the main magnetic pole of the permanent magnet, the center of the inner circle of the auxiliary magnetic pole of the permanent magnet and the center of the inner circle of the auxiliary magnetic pole of the ferrite are coincided,
the magnetizing direction of the permanent magnet main pole is radial magnetizing, and the magnetizing angle of the permanent magnet auxiliary pole is theta.
Furthermore, the magnetizing angle theta of the auxiliary permanent magnet pole is equal to the circle center angle alpha corresponding to the main permanent magnet pole 1 Outer radius R 1 Is opposite to the auxiliary magnetic pole of the permanent magnetCorresponding angle of circle center (alpha) 2 -α 1 ) Outer radius R 2 And comprehensively determining, after determining the structural size of the segmented eccentric integrated magnetic pole, calculating to obtain the magnetic flux density waveform of the radial air gap of the motor under different magnetizing angles theta based on an analytic model of the radial air gap magnetic density under the load condition of the hub motor, carrying out parametric scanning by Matlab software to obtain the corresponding magnetizing angle when the air gap magnetic density harmonic content is minimum and the fundamental wave amplitude is excellent, and then checking and determining based on Maxwell finite element simulation software.
Further, the circle center angle alpha corresponding to the main magnetic pole of the permanent magnet is increased 1 The amplitude of 5 th and above 5 th harmonic waves in an air gap magnetic field generated by the main magnetic pole of the permanent magnet can be reduced.
Further, when the main magnetic pole of the permanent magnet corresponds to the center angle α 1 When the magnetizing angle theta of the auxiliary magnetic pole is fixed, the circle center angle (alpha) corresponding to the auxiliary magnetic pole of the permanent magnet is increased 2 -α 1 ) The fundamental component in the air gap flux density can be improved, and the content of higher harmonics in the air gap flux density is inhibited.
Further, when
And when the magnetizing angle of the auxiliary magnetic pole of the permanent magnet is 45 degrees, the integrated eccentric magnetic pole structure can reduce 3-order and 5-order harmonics to the maximum extent.
Further, when
And when the magnetizing angle of the auxiliary magnetic pole of the permanent magnet is 45 degrees, the integrated eccentric magnetic pole structure can reduce 7-order, 11-order and 13-order harmonics to the maximum extent.
Further, when the central angles corresponding to the permanent magnet main pole, the permanent magnet auxiliary pole and the ferrite auxiliary pole are fixed, the eccentricity (b) of the permanent magnet main pole is increased 1 +b 2 ) The amplitude of the fundamental component in the air-gap magnetic field can be increased on the premise of not influencing the amplitude of the harmonic component in the air-gap magnetic field.
Furthermore, the permanent magnet main pole is made of neodymium iron boron, the permanent magnet auxiliary pole is made of Halbach array permanent magnet, and the ferrite auxiliary pole is made of soft magnetic ferrite.
Compared with the prior art, the invention has the following effects:
by integrating the ferrite auxiliary magnetic pole, the permanent magnet auxiliary magnetic pole and the permanent magnet main magnetic pole, the amplitude of the air gap flux density can be effectively improved, the sine degree of the air gap flux density is improved, and the harmonic content is reduced. The advantage of reducing torque ripple is effectively achieved while increasing output torque. Meanwhile, the ferrite magnetic pole is used for replacing partial permanent magnet material, so that the cost of the motor can be effectively reduced. Compare the magnetic pole structure in current speed reduction drive formula in-wheel motor, the eccentric integrated form magnetic pole structure of segmentation of this application can solve simultaneously in the motor cost higher and the great problem of torque ripple, has the significance to the popularization of in the electric automobile field of in-wheel motor.
Drawings
FIG. 1 is a schematic structural diagram (R) of the present application out Refers to the rotor outer diameter);
FIG. 2 is a schematic structural view of a hub motor using the magnetic pole structure of the present application;
fig. 3 is a schematic view of a conventional reduction drive type in-wheel motor;
FIG. 4 is a schematic structural view of a conventional eccentric pole-cutting magnetic pole;
fig. 5 is a schematic structural view of a conventional integrated magnetic pole;
FIG. 6 is a comparison graph of air gap flux density waveforms of a hub motor with the magnetic pole structure of the present application and a conventional surface-mounted hub motor;
fig. 7 shows the back electromotive force waveform of the hub motor using the magnetic pole structure of the present application.
Detailed Description
The specific implementation mode is as follows: the present embodiment is described with reference to fig. 1 to 7, in which a segmented eccentric integrated magnetic pole structure of an in-wheel motor includes a permanent magnet main pole 1, two permanent magnet auxiliary poles 2 and two ferrite auxiliary poles 3, where the two permanent magnet auxiliary poles 2 and the two ferrite auxiliary poles 3 are both provided at two ends of the permanent magnet main pole 1, and the two ferrite auxiliary poles 3 are provided symmetrically and located at one ends of the two permanent magnet auxiliary poles 2 away from the permanent magnet main pole 1;
the permanent magnet main magnetic pole 1 and the permanent magnet auxiliary magnetic pole 2 are both eccentrically sharpened, wherein the inner arc and the outer arc of the permanent magnet main magnetic pole 1 and the inner arc and the outer arc of the permanent magnet auxiliary magnetic pole 2 are both eccentrically arranged, the inner arc and the outer arc of the ferrite auxiliary magnetic pole 3 are concentrically arranged, the center of the inner circle of the permanent magnet main magnetic pole 1, the center of the inner circle of the permanent magnet auxiliary magnetic pole 2 and the center of the inner circle of the ferrite auxiliary magnetic pole 3 are coincided,
the magnetizing direction of the permanent magnet main pole 1 is radial magnetizing, and the magnetizing angle of the permanent magnet auxiliary pole 2 is theta.
The permanent magnet main magnetic pole 1 is used for generating a main magnetic field in an air gap of the motor, and generates electromagnetic torque after generating traveling wave magnetic field interaction with the three-phase stator winding 6 to drive an inner rotor of the motor to rotate; the permanent magnet auxiliary magnetic pole 2 is used for generating an auxiliary magnetic field, increasing fundamental wave components in air gap flux density, and improving the waveform of the air gap flux density, so that the air gap magnetic field is distributed along the circumferential direction of the motor to be closer to a sinusoidal curve, and torque pulsation is reduced; the ferrite auxiliary magnetic pole 3 structure is used for replacing partial permanent magnet materials, so that the purposes of reducing the using amount of the permanent magnet and reducing the cost of the motor are achieved, and meanwhile, the content of high-order harmonic waves in an air gap magnetic field can be reduced.
The circle center of the inner circle of the permanent magnet main pole 1 is not coincident with the circle center of the outer circle, and the circle center of the inner circle of the permanent magnet auxiliary pole 2 is not coincident with the circle center of the outer circle and respectively has respective circle centers. In order to reduce the manufacturing difficulty, the ferrite auxiliary magnetic pole 3 is not processed eccentrically, i.e. the center of the inner circle of the ferrite auxiliary magnetic pole 3 coincides with the center of the outer circle. The permanent magnet main magnetic pole 1, the permanent magnet auxiliary magnetic pole 2 and the ferrite auxiliary magnetic pole 3 are tightly meshed together along the circumferential direction.
The two permanent magnet auxiliary magnetic poles 2 which are symmetrically arranged are completely the same in structural size, the permanent magnet auxiliary magnetic poles 2 are symmetrically distributed along the central line of the permanent magnet main magnetic pole 1, the magnetizing angle is theta, namely the included angle between the magnetizing direction and the radial direction is (90-theta);
the inner circle center of the permanent magnet main pole 1Is O 3 The inner circle radius is R in The center of the excircle is O 1 The outer circle radius is R 1 Wherein the center of the outer circle does not coincide with the center of the inner circle, and the center of the outer circle is O 1 And the center of the inner circle O 3 The distance between the two poles is the eccentricity of the permanent magnet main pole 1, and the length thereof is equal to (b) 1 +b 2 ) The corresponding circle center angle of the permanent magnet main magnetic pole 1 is alpha 3 ；
The center of the inner circle of the permanent magnet auxiliary magnetic pole 2 is O 3 Coincides with the center of the inner circle of the permanent magnet main pole 1 and the center of the outer circle is O 2 Does not coincide with the center of the inner circle and has an outer circle radius of R 2 (ii) a Wherein, the center of the excircle is O 2 And the center of the inner circle O 3 The distance between them is the eccentricity of the permanent magnet secondary pole 2 and its length is equal to b 1 (ii) a The corresponding circle center angle of the permanent magnet auxiliary magnetic pole 2 is (alpha) 2 -α 1 )；
The center of the inner circle of the ferrite auxiliary magnetic pole 3 is O 3 The radius of the inner circle is R in The outer circle radius is R 3 (ii) a The center angle of the ferrite auxiliary magnetic pole 3 is (alpha) 3 -α 2 -α 1 )；
When designing the corresponding angles of the permanent magnet main magnetic pole 1, the auxiliary magnetic pole and the ferrite auxiliary magnetic pole, the design is specifically designed according to the times of main harmonics in the air gap field of the motor.
Eccentricity (b) 1 +b 2 ) The design method is comprehensively designed according to the radius of a motor rotor, the cost, the heat dissipation condition of the motor and the fluctuation rate of the output torque.
Fig. 7 shows a simulation result of the back electromotive force waveform of the segmented eccentric integrated hub motor, and it can be seen from the figure that the back electromotive force is distributed sinusoidally with the rotor electrical angle, which shows that the segmented eccentric integrated magnetic pole of the present invention can effectively suppress the torque ripple of the motor and improve the output stability of the motor.
Adopt this application magnetic pole structure's in-wheel motor to install in electric automobile's wheel hub, except this application magnetic pole structure outside, it still includes rotor core 4, stator core 5, stator winding 6 and casing 7, and it adopts inner rotor structure, operates under high rotational speed operating mode usually.
An inner rotor of the motor consists of a rotor magnetic pole and a rotor iron core 4, and the purpose of reducing the rotating speed and increasing the output torque is achieved by connecting a rotor rotating shaft with a speed reducing mechanism such as a planetary gear; compared with the traditional permanent magnet synchronous motor, the speed reduction driving type hub motor has the advantages of small occupied space and higher operation efficiency; the rotor magnetic pole is composed of a permanent magnet main magnetic pole 1, a permanent magnet auxiliary magnetic pole 2 and a ferrite auxiliary magnetic pole 3, and a rotor iron core 4 adopts a silicon steel sheet structure and does not need to be subjected to special processes such as sinusoidal pole cutting or eccentric pole cutting; the processing difficulty is low; the stator core 5 is also of a silicon steel sheet structure and is uniformly grooved along the axial direction of the stator; the stator winding 6 is embedded in the slots of the stator core 5.
Aiming at the traditional speed reduction driving type hub motor, the magnetic pole structure of the traditional permanent magnet is designed into an integrated segmented eccentric permanent magnet main magnetic pole 1, an auxiliary magnetic pole and a ferrite auxiliary magnetic pole 3; the ferrite material with low cost is used as the auxiliary magnetic pole to replace the permanent magnet material in the traditional magnetic pole, so that the use amount of the rare earth permanent magnet is reduced, and the purpose of reducing the cost is realized; the permanent magnet main pole 1 with the segmented eccentric design can enable the waveform of the air gap flux density to be closer to a sine wave, reduce the harmonic content in the air gap flux density and further improve the output stability of the hub motor; the amplitude of fundamental waves in the air gap flux density can be improved through the permanent magnet auxiliary magnetic poles in the segmented eccentric design, the defects of air gap leakage magnetic field increase and efficiency reduction caused by eccentric pole cutting of the permanent magnet main magnetic pole 1 are overcome, the sine degree of the air gap flux density is further improved, and the pulsation of output torque is reduced; in addition, because the anti-demagnetization capability of the ferrite material is stronger than that of the rare earth permanent magnet material, after the ferrite material and the rare earth permanent magnet material are integrated, the risk of local demagnetization in the traditional permanent magnet material can be reduced, and the running reliability of the motor is improved.
Compare in the magnetic pole structure among the current speed reduction drive in-wheel motor, the eccentric integrated form magnetic pole structure of segmentation of this application has synthesized traditional integrated form magnetic pole structure and the advantage of eccentric pole cutting permanent magnet magnetic pole structure, can reduce the quantity of permanent magnet in the motor and harmonic content in the air gap magnetic field simultaneously, have had low-cost and low torque pulsation's advantage concurrently, can solve the higher and great problem of torque pulsation of cost in the current speed reduction drive in-wheel motor simultaneously, it is significant to the popularization of in-wheel motor in the electric automobile field.
The magnetizing angle theta of the permanent magnet auxiliary magnetic pole 2 is equal to the circle center angle alpha corresponding to the permanent magnet main magnetic pole 1 1 Outer radius R 1 The angle (alpha) of the center of the circle corresponding to the auxiliary magnetic pole 2 of the permanent magnet 2 -α 1 ) Outer circle radius R 2 Comprehensively determining, after determining the structural size of the segmented eccentric integrated magnetic pole, calculating to obtain the magnetic flux density waveform of the radial air gap of the motor under different magnetizing angles theta based on an analytic model of the radial air gap magnetic density under the load condition of the hub motor, carrying out parametric scanning through Matlab software to obtain the corresponding magnetizing angle when the harmonic content of the air gap magnetic density is minimum and the fundamental wave amplitude is excellent, and then checking and determining based on Maxwell finite element simulation software. When the structure size of the segmented eccentric integrated magnetic pole is determined, the optimal magnetizing angle theta can simultaneously influence the amplitude of the fundamental component and the harmonic content in the air gap flux density.
Increase the corresponding circle center angle alpha of the permanent magnet main pole 1 1 The amplitude of 5 th order and above 5 th order harmonic waves in the air gap magnetic field generated by the permanent magnet main pole 1 can be reduced. By such design, the output stability can be improved.
When the center angle alpha corresponding to the main pole 1 of the permanent magnet 1 When the magnetizing angle theta of the auxiliary magnetic pole is fixed, the circle center angle (alpha) corresponding to the auxiliary magnetic pole 2 of the permanent magnet is increased 2 -α 1 ) The fundamental component in the air gap flux density can be improved, and the content of higher harmonics in the air gap flux density is restrained.
Increase the corresponding circle center angle (alpha) of the ferrite auxiliary magnetic pole 3 3 -α 2 -α 1 ) The permanent magnet consumption in the magnetic pole can be effectively reduced. Thereby reducing the cost.
When in use
When the magnetizing angle of the permanent magnet auxiliary magnetic pole 2 is 45 degrees, the integrated eccentric magnetic pole structure can be reduced by 3 times and 5 times to the maximum extentHarmonics.
When in use
And when the magnetizing angle of the auxiliary magnetic pole 2 of the permanent magnet is 45 degrees, the integrated eccentric magnetic pole structure can reduce 7-order, 11-order and 13-order harmonics to the maximum extent.
When the central angles corresponding to the permanent magnet main pole 1, the permanent magnet auxiliary pole 2 and the ferrite auxiliary pole 3 are fixed, the eccentricity (b) of the permanent magnet main pole 1 is increased 1 +b 2 ) The amplitude of the fundamental component in the air-gap magnetic field can be increased on the premise of not influencing the amplitude of the harmonic component in the air-gap magnetic field. Further, the harmonic magnetic field content in the air-gap magnetic field is effectively reduced, and torque ripple is suppressed.
The permanent magnet main magnetic pole 1 is made of neodymium iron boron materials, the permanent magnet auxiliary magnetic pole 2 is a Halbach array permanent magnet, and the ferrite auxiliary magnetic pole 3 is made of soft magnetic ferrite materials.
Claims (7)
1. The utility model provides an eccentric integrated form magnetic pole structure of segmentation of in-wheel motor which characterized in that: the permanent magnet auxiliary magnetic pole comprises a permanent magnet main magnetic pole (1), permanent magnet auxiliary magnetic poles (2) and ferrite auxiliary magnetic poles (3), wherein the number of the permanent magnet auxiliary magnetic poles (2) and the number of the ferrite auxiliary magnetic poles (3) are two, the two permanent magnet auxiliary magnetic poles (2) are symmetrically arranged at two ends of the permanent magnet main magnetic pole (1), and the two ferrite auxiliary magnetic poles (3) are symmetrically arranged and are respectively positioned at one ends, far away from the permanent magnet main magnetic pole (1), of the two permanent magnet auxiliary magnetic poles (2);
the permanent magnet main magnetic pole (1) and the permanent magnet auxiliary magnetic pole (2) are eccentrically cut, wherein the inner arc and the outer arc of the permanent magnet main magnetic pole (1) and the inner arc and the outer arc of the permanent magnet auxiliary magnetic pole (2) are eccentrically arranged, the inner arc and the outer arc of the ferrite auxiliary magnetic pole (3) are concentrically arranged, and the center of the inner circle of the permanent magnet main magnetic pole (1), the center of the inner circle of the permanent magnet auxiliary magnetic pole (2) and the center of the inner circle of the ferrite auxiliary magnetic pole (3) are coincided;
the magnetizing direction of the permanent magnet main pole (1) is radial magnetizing, and the magnetizing angle of the permanent magnet auxiliary pole (2) is theta;
a main magnetic pole (1) of the permanent magnet is opposite toThe angle of the circle center is alpha 1 The angle of the circle center corresponding to the permanent magnet main pole (1) and the two permanent magnet auxiliary poles (2) is alpha 2 The angle of the circle center corresponding to the whole magnetic pole structure is alpha 3 ；
When in use
And when the magnetizing angle of the auxiliary magnetic pole (2) of the permanent magnet is 45 degrees, the integrated eccentric magnetic pole structure can reduce 3-order and 5-order harmonics to the maximum extent.
2. The segmented eccentric integrated type magnetic pole structure of an in-wheel motor according to claim 1, wherein: the magnetizing angle theta of the permanent magnet auxiliary magnetic pole (2) is equal to the circle center angle alpha corresponding to the permanent magnet main magnetic pole (1) 1 Outer radius R 1 A circle center angle alpha corresponding to the permanent magnet auxiliary magnetic pole (2) 2 -α 1 Outer radius R 2 Comprehensively determining, after determining the structural size of the segmented eccentric integrated magnetic pole, calculating to obtain the magnetic flux density waveform of the radial air gap of the motor under different magnetizing angles theta based on an analytic model of the radial air gap magnetic density under the load condition of the hub motor, carrying out parametric scanning through Matlab software to obtain the corresponding magnetizing angle when the harmonic content of the air gap magnetic density is minimum and the fundamental wave amplitude is excellent, and then checking and determining based on Maxwell finite element simulation software.
3. The segmented eccentric integrated type magnetic pole structure of an in-wheel motor according to claim 1, wherein: increase the circle center angle alpha corresponding to the main magnetic pole (1) of the permanent magnet 1 The amplitude of 5 th and above 5 th harmonic waves in an air gap magnetic field generated by the permanent magnet main pole (1) can be reduced.
4. The segmented eccentric integrated-type magnetic pole structure of the in-wheel motor as claimed in claim 1, wherein: when the corresponding circle center angle alpha of the main magnetic pole (1) of the permanent magnet 1 When the magnetizing angle theta of the auxiliary magnetic pole is fixed, the circle center angle alpha corresponding to the auxiliary magnetic pole (2) of the permanent magnet is increased 2 -α 1 The fundamental component in the air gap flux density can be improved, and the content of higher harmonics in the air gap flux density is restrained.
5. The segmented eccentric integrated type magnetic pole structure of an in-wheel motor according to claim 1, wherein: when in use
And when the magnetizing angle of the permanent magnet auxiliary magnetic pole (2) is 45 degrees, the integrated eccentric magnetic pole structure can reduce 7-order, 11-order and 13-order harmonics to the maximum extent.
6. The segmented eccentric integrated type magnetic pole structure of an in-wheel motor according to claim 1, wherein: when the central angles corresponding to the permanent magnet main pole (1), the permanent magnet auxiliary pole (2) and the ferrite auxiliary pole (3) are fixed, the eccentricity b of the permanent magnet main pole (1) is increased 1 +b 2 The amplitude of the fundamental component in the air-gap magnetic field can be increased on the premise of not influencing the amplitude of the harmonic component in the air-gap magnetic field.
7. The segmented eccentric integrated-type magnetic pole structure of the in-wheel motor as claimed in claim 1, wherein: the permanent magnet main magnetic pole (1) is made of neodymium iron boron materials, the permanent magnet auxiliary magnetic pole (2) is a Halbach array permanent magnet, and the ferrite auxiliary magnetic pole (3) is made of soft magnetic ferrite materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110244452.4A CN112821618B (en) | 2021-03-05 | 2021-03-05 | Segmented eccentric integrated magnetic pole structure of hub motor |
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| CN202110244452.4A CN112821618B (en) | 2021-03-05 | 2021-03-05 | Segmented eccentric integrated magnetic pole structure of hub motor |
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| CN112821618A CN112821618A (en) | 2021-05-18 |
| CN112821618B true CN112821618B (en) | 2022-11-25 |
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| CN113612327A (en) * | 2021-08-10 | 2021-11-05 | 哈尔滨电机厂有限责任公司 | A permanent magnet synchronous motor |
| CN116914964B (en) * | 2023-07-13 | 2024-04-09 | 清华大学 | Hub motor and permanent magnet structure thereof |
| CN119171663A (en) * | 2024-08-16 | 2024-12-20 | 苏州清猛智能科技有限公司 | Axial flux motor rotor, motor and flying car |
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| CN109672288A (en) * | 2019-03-01 | 2019-04-23 | 四川大学 | A kind of surface-built-in permanent magnet motor rotor |
| CN112366838A (en) * | 2020-11-05 | 2021-02-12 | 杭州洲钜电子科技有限公司 | Surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles |
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| CN1976171A (en) * | 2005-12-01 | 2007-06-06 | 爱知Elec株式会社 | Permanent magnet rotating machine |
| CN109672288A (en) * | 2019-03-01 | 2019-04-23 | 四川大学 | A kind of surface-built-in permanent magnet motor rotor |
| CN112366838A (en) * | 2020-11-05 | 2021-02-12 | 杭州洲钜电子科技有限公司 | Surface-mounted-built-in type bearingless permanent magnet synchronous motor based on combined magnetic poles |
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