CN113037029B - Design method of low-vibration permanent magnet motor modified rotor structure - Google Patents

Design method of low-vibration permanent magnet motor modified rotor structure Download PDF

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CN113037029B
CN113037029B CN202110255720.2A CN202110255720A CN113037029B CN 113037029 B CN113037029 B CN 113037029B CN 202110255720 A CN202110255720 A CN 202110255720A CN 113037029 B CN113037029 B CN 113037029B
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rotor
motor
permanent magnet
harmonic
modification
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CN113037029A (en
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吉敬华
周云瀚
赵文祥
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Jiangsu University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • 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
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Abstract

The invention discloses a design method of a low-vibration permanent magnet motor modified rotor structure, which solves the problem of overlarge motor noise caused by an electromagnetic force modulation effect. The method can be applied to the surface of a rotor core of an internal permanent magnet motor or a permanent magnet of a surface-mounted permanent magnet motor. After the permanent magnet motor adopts a modified rotor structure, the air gap flux density harmonic amplitude which mainly plays a role in vibration noise can be obviously reduced, the sine degree of the air gap flux density of the motor is improved, and further the low-space-order radial electromagnetic force generated by the electromagnetic force modulation effect is weakened, the vibration noise is obviously improved, and the aim of improving the operation stability of the motor is fulfilled.

Description

Design method of low-vibration permanent magnet motor modified rotor structure
Technical Field
The invention relates to a design method of a low-vibration permanent magnet motor modification rotor, belonging to the technical field of novel low-vibration noise motor manufacturing.
Background
The permanent magnet synchronous motor has the characteristics of high power density, high torque density and the like, and has a very strong application prospect in the fields of electric automobiles, ship propulsion, aerospace and the like. With the further development of permanent magnet motors in recent years, the problem of operation stability of permanent magnet motors has also received further attention. For the wide speed regulation permanent magnet motor for the vehicle, besides the electromagnetic performance, the vibration noise condition has great influence on the whole vehicle comfort, and the reduction of the vibration noise is very critical on the premise of basically ensuring the electromagnetic performance of the permanent magnet motor.
At present, researches on suppressing vibration noise of a permanent magnet motor mainly reduce the amplitude of the lowest spatial order radial electromagnetic force of the motor. In addition to low-order radial force, research in recent two years shows that high-spatial-order radial electromagnetic force can be modulated into low-order radial force through the modulation effect of electromagnetic force, thereby playing an important role in vibration noise.
The method for weakening the electromagnetic vibration noise of the V-shaped magnetic steel rotor permanent magnet motor for the electric automobile is researched by the Chinese Motor engineering report, 2019,39(16): 4919-.
The Chinese invention patent application number 202010006675.2 discloses a multiphase skewed slot shift extremely low vibration noise permanent magnet motor, which applies a rotor permanent magnet segmented skewed pole technology, can effectively inhibit the air gap flux density harmonic component of the motor, reduce the cogging torque and the torque pulsation, and has excellent vibration and noise reduction effects. The skewed slot approach, however, produces unbalanced axial forces that are particularly pronounced when the motor is bulky, which limits the range of applications for this approach.
The Chinese patent application No. 202010182789.2 discloses a rotor structure of a low-noise light-weight permanent magnet motor, wherein the magnetic pole of the motor rotor adopts a bread-type permanent magnet structure, and the structure can improve the sine degree of air gap flux density and improve the vibration noise condition of the motor. However, the average torque of the motor is obviously reduced by the structure, and the method does not consider the influence of the electromagnetic force modulation effect on vibration noise, and is not well suitable for the permanent magnet motor under various slot pole matching conditions.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a design method of a low-vibration permanent magnet motor modification rotor, obviously reduces vibration noise generated when a permanent magnet motor runs on the premise of ensuring reliability and practicability, solves the problem of limited application range of the existing noise reduction method, and can reduce the tooth socket torque and torque pulsation of the motor in running.
Specifically, the invention is realized by adopting the following technical scheme: a design method of a low-vibration permanent magnet motor modification rotor comprises the following specific steps:
step 1, analyzing structural parameters of a target permanent magnet motor, wherein the parameters comprise main parameters such as slot pole matching of the permanent magnet motor, the size of the inner diameter and the outer diameter of a stator, the proportion of the tooth width of the stator to the tooth pitch, the thickness of an air gap between the stator and a rotor and the like;
step 2, confirming a motor size model, carrying out modeling analysis on the motor, solving a radial magnetic density waveform and an electromagnetic force waveform of the motor by using an analytical method or commercial finite element software, carrying out harmonic analysis, judging a harmonic order which mainly plays a role in vibration noise, then determining a proper harmonic attenuation method, and determining a rotor modification formula and parameters of the formula;
and 3, determining a rotor modification range after the rotor modification formula is determined. And then converting the polar coordinate data into rectangular coordinates by using a coordinate conversion method, and drawing the surface shape of the modified motor rotor by using a point drawing method.
And 4, importing the obtained rotor surface shape into finite element software, and analyzing the rotor model without modification to obtain performance indexes such as radial force harmonic amplitude, torque average value and torque pulsation after harmonic attenuation.
And 5, importing the whole structure model of the motor and the electromagnetic force calculation result after simulation into acoustic boundary element software, analyzing the structural mode and vibration noise of the motor to obtain a vibration noise result after the rotor is modified, and verifying the effectiveness of the invention.
Further, in step 2, the mentioned rotor modification method includes sine harmonic attenuation and sine minus eleven-order harmonic attenuation.
Further, in step 2, the mentioned formula of the rotor harmonic attenuation is as follows:
Figure GDA0003470138080000021
wherein θ represents a mechanical angle of the rotor modification range; ro(theta) represents the magnitude of the outer diameter of the rotor of the motor as a function of theta; riniThe size of the initial rotor outer diameter of the motor is represented; tau ispThe pole pitch of the motor rotor is represented; a represents the magnitude of the eleven harmonic attenuation amplitudes; k (a) is an amount that varies with a to adjust the air gap thickness of the motor to maintain the fundamental flux density amplitude within a stable range. Formula (I) represents a sine harmonic attenuation method if a is 0 and k (a) is 1; if a ≠ 0, then equation (I) represents the sine-minus-eleven-harmonic attenuation method.
Further, in step 3, in order to ensure the accuracy of the rotor structure shape, the number of the selected coordinate points is 100. The scatter coordinates are confirmed by using the transformation of polar coordinates and rectangular coordinates:
Figure GDA0003470138080000031
and finally, rotationally copying according to the actual period number of the motor, drawing a complete rotor surface shape, and storing the complete rotor surface shape for the next leading-in analysis operation.
Further, in step 3, when the sine-minus-eleven-harmonic attenuation method is adopted, in order to ensure that the air gap thickness is consistent with the sine-harmonic attenuation method, the parameters k (a) and a in formula (I) need to be constrained according to formulas (III) and (IV). Wherein h isgapIs the thickness of the air gap under the initial rotor structure, hgap_sinIs the equivalent air gap thickness h after sine harmonic attenuationgap_sin-11And the equivalent air gap thickness after attenuation is sine minus eleven harmonics.
Figure GDA0003470138080000032
Figure GDA0003470138080000033
Further, in the step 4, the obtained rotor shape curve file is imported into finite element software, and finite element simulation is performed on the model to obtain various electromagnetic performance indexes.
Further, in the step 5, the electromagnetic force calculation result is obtained, and the acoustic boundary element software is used for performing simulation analysis on the complete machine mode and the vibration noise by combining the complete machine model of the motor.
Further, the low-vibration permanent magnet motor comprises a stator core (1), a rotor core (3) and magnetic steel (4), an armature winding adopts a double-layer short-distance distributed winding form, the winding span is 5, the magnetic steel adopts a V-shaped built-in structure, the permanent magnet is made of N42UH, the included angle is 150 degrees, and the stator core and the rotor core are made of DW310-35 materials.
On the basis of analyzing and mastering the structural parameters of the motor, the radial air gap flux density and the radial electromagnetic force of the motor are solved by using an analytic calculation method or finite element software, and further harmonic analysis is carried out. After defining the harmonic components of the radial flux density and radial force that are the dominant contributors to vibration noise, a specific harmonic attenuation method is selected accordingly.
When the sine minus eleven-order harmonic attenuation method is adopted, in order to ensure that the air gap thickness is consistent with the sine harmonic attenuation method, constraint limitation is required to be carried out on parameters in a final confirmation formula.
After selecting a proper harmonic wave weakening method, analyzing and calculating or simulating a fundamental wave permanent magnetic flux density amplitude value according to an analysis method, and further determining each index and the size of the value in a harmonic wave weakening formula on the premise of maintaining the stability of the value of a fundamental wave component.
After a harmonic weakening formula is determined, determining the range size of the harmonic weakening formula acting in a periodic rotor pole pitch, and utilizing professional drawing software to draw graphs and display the surface shape of the motor rotor after harmonic weakening.
And (4) importing the obtained profile shape into finite element software, and carrying out finite element analysis on the rotor unmodified motor model to obtain performance indexes such as radial force harmonic amplitude, torque average value and torque pulsation after harmonic attenuation.
And importing the whole structure model of the motor and the electromagnetic force calculation result after simulation into acoustic boundary element software, and analyzing the structural mode and the vibration noise of the motor to obtain the vibration noise result of the motor after the rotor is modified.
In order to ensure the accuracy of the rotor shape, the number of the selected scattered points is not less than 100. And copying the selected data, drawing a curve in professional drawing software to obtain a periodic shape in a rotor polar distance, and finally rotationally copying according to the actual period number of the motor to draw a complete shape-modified rotor structure.
When the vibration noise characteristic of the motor is calculated, in order to simplify the complexity of a calculation model and optimize the calculation time, only the end cover shell, the stator core and the winding assembly of the motor, the rotor core and other moving parts are considered to be out of the calculation range.
The invention has the following benefits and effects:
1. after the permanent magnet motor rotor is subjected to modification treatment, the vibration noise of the motor under the running condition is obviously reduced, and the running stability is obviously improved.
2. The invention can improve the electromagnetic performance and reduce the cogging torque and the torque ripple of the motor while reducing the vibration noise of the motor.
3. The modification method for weakening the rotor by using the harmonic waves has a wide application range, and can overcome the limitation of the traditional method for reducing the vibration noise of the motor.
In conclusion, the design method of the low-vibration permanent magnet motor modification rotor can remarkably reduce the vibration noise of the motor, simultaneously improves the electromagnetic performance, has a wider application range and overcomes the limitation of the traditional method.
Drawings
FIG. 1 is a schematic structural diagram of an interior permanent magnet machine according to the present invention;
FIG. 2 is a schematic view of a modified rotor structure according to the present invention; (a) is a rotor sine modification schematic diagram; (b) the sine minus eleven harmonic modification schematic diagram of the rotor is shown;
FIG. 3 is a radial air gap flux density harmonic comparison chart of the original motor and the motor of the embodiment of the invention;
FIG. 4 is a graph showing a comparison of surface vibration acceleration of a motor according to the present invention and a motor according to an embodiment;
FIG. 5 is a comparison graph of torque ripple of the motor of the present invention;
FIG. 6 is a flow chart of the harmonic attenuation rotor design of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In order to be able to illustrate the advantages of the invention more simply and clearly, a detailed description is given below in connection with a specific interior permanent magnet synchronous machine.
The invention relates to a design method of a low-vibration permanent magnet motor modification rotor, which comprises the following specific steps:
step 1, analyzing structural parameters of a target permanent magnet motor, wherein the parameters comprise parameters of slot pole matching, the size of the inner diameter and the outer diameter of a stator, the ratio of the tooth width of the stator to the tooth pitch and the thickness of an air gap between the stator and a rotor of the permanent magnet motor. In this embodiment, the slot poles are selected to be an integer number of 72 slots and 12 poles for the motor application, and the outer diameter of the stator is selected to be 430 mm for meeting the design requirements, the inner diameter of the stator is 340 mm, and the air gap thickness is 1 mm. Drawing the section of the permanent magnet motor by using professional drawing software;
step 2, confirming a motor size model, carrying out modeling analysis on the motor, solving a radial magnetic density waveform and an electromagnetic force waveform of the motor by using an analytical method or finite element software, carrying out harmonic analysis, judging a harmonic order which mainly plays a role in vibration noise, then determining a proper rotor harmonic attenuation method, and determining a rotor modification formula and parameters of the formula;
step 3, after a rotor modification formula is determined, determining a rotor modification range, converting polar coordinate data into rectangular coordinates by using a coordinate conversion method, and drawing the surface shape of the modified motor rotor by using a point tracing method;
and 4, storing the obtained rotor surface shape into a universal format, importing finite element software, and performing modeling treatment. Analyzing a motor model with an unmodified rotor to obtain performance indexes such as harmonic amplitude of radial force, average torque value and torque ripple after harmonic attenuation, verifying that the harmonic amplitude of the radial force of the modified scheme is reduced, the torque ripple is reduced, and preliminarily verifying the validity of a conclusion;
and 5, importing the whole structure model of the motor and the electromagnetic force calculation result after simulation into acoustic boundary element software, analyzing the structural mode and vibration noise of the motor to obtain a vibration noise result after the rotor is modified, and verifying the effectiveness of the invention.
The expression of the rotor harmonic attenuation method in the step 2 is as follows:
Figure GDA0003470138080000051
wherein θ represents a mechanical angle of the rotor modification range; ro(theta) represents the magnitude of the outer diameter of the rotor of the motor as a function of theta; r isiniThe size of the outer diameter of the initial rotor of the motor is represented; tau ispRepresenting the pole pitch of the motor rotor; a represents the magnitude of the eleven harmonic attenuation amplitudes; k (a) is an amount varying with a to adjust the air gap thickness of the motor to maintain the fundamental flux density amplitude within a stable range, and when a is 0 and k (a) is 1, formula (I) represents a sine harmonic attenuation method; if a ≠ 0, then equation (I) represents the sine-minus-eleven-harmonic attenuation method.
In the step 3, in order to ensure the accuracy of the rotor structure shape, the number of the selected coordinate points is 100, and the scattered point coordinates are confirmed by using the transformation of polar coordinates and rectangular coordinates:
Figure GDA0003470138080000052
and finally, rotationally copying according to the actual period number of the motor, drawing a complete rotor surface shape, and storing the complete rotor surface shape for the next importing analysis operation.
In the step 3, when the sine-minus-eleven-order harmonic attenuation method is adopted, in order to ensure that the air gap thickness is consistent with that of the sine-order harmonic attenuation method, the parameters k (a) and a in the formula (I) need to be constrained according to the formulas (III) and (IV); wherein h isgapIs the thickness of the air gap under the initial rotor structure, hgap_sinIs the equivalent air gap thickness after attenuation of sine harmonic wave, hgap_sin-11And the equivalent air gap thickness after attenuation is sine minus eleven harmonics.
Figure GDA0003470138080000061
Figure GDA0003470138080000062
In the figure: 1. stator iron core, 2, rotor iron core surface, 3, rotor iron core, 4, magnetic steel, 5, sine weakening modification rotor surface, 6, sine reducing eleven harmonic modification rotor surface, 7, initial structure rotor surface, 8, rotor iron core outer radius, 9, and periodic rotor iron core polar distance size tau p10, mechanical angle of rotor core modification range, 11 and mechanical angle variable theta.
Fig. 1 is a schematic diagram of a periodic model of the motor in this embodiment, and a stator core 1, a rotor core 3 and magnetic steel 4 jointly form the periodic model of the interior permanent magnet synchronous motor. The armature winding of the motor adopts a double-layer short-distance distributed winding form, the winding span is 5, the magnetic steel adopts a V-shaped built-in structure, the included angle is 150 degrees, the permanent magnet material is N42UH, and the stator iron core and the rotor iron core are both DW 310-35;
fig. 2 is a schematic structural design diagram of a low-vibration permanent magnet motor modified rotor, which includes two design methods, the first is sine harmonic attenuation modification 5, and the second is sine minus eleven harmonic attenuation modification 6. The difference between formula 5 and formula 6 is mainly that if a is 0 and k (a) is 1 in formula (I), formula (I) represents a sine harmonic attenuation method; if a ≠ 0, then equation (I) represents the sine-minus-eleven-harmonic attenuation method. The sine minus eleven-time modification method is more accurate in positioning and better in effect. The two methods are characterized in that the graph drawing adopts a polar coordinate and rectangular coordinate conversion mode to generate scattered points, then professional drawing software is introduced to automatically generate curves, and finally finite element software is introduced to solve the electromagnetic performance. Wherein, in order to ensure the loss degree of the electromagnetic torque within a reasonable range, the modification range is strictly selected, namely the modification mechanical angle variable theta and the pole pitch tau of the rotor corepThe ratio of (A) to (B) is strictly selected. Meanwhile, the equivalent air gap thickness is ensured to be in a reasonable range;
fig. 3 is a comparison diagram of radial air gap flux density harmonics of the original motor and the motor of the embodiment of the present invention, and it can be seen from the diagram that 11 th harmonic and 13 th harmonic which mainly affect the electromagnetic force modulation effect of the stator teeth of the motor are reduced to a significant extent after the modification method is adopted. At this time, the amplitude of the tooth number order electromagnetic force harmonic wave which mainly acts on the vibration noise can be calculated by an analytic method. Compared with the initial rotor structure, the electromagnetic force harmonic amplitude of the modification structure is obviously reduced;
FIG. 4 is a graph comparing surface vibration acceleration of the motor according to the present invention and the motor according to the present embodiment. The result graph is generated by using acoustic boundary element software, and vibration points are selected on the surface of the motor shell. It can be seen from the figure that after the modification structure is adopted, the drop of the vibration noise at the 12-frequency doubling position which is particularly obvious is obvious, and the vibration conditions at the rest frequencies are not changed greatly, so that the method has a more targeted weakening effect on the vibration noise at the 12-frequency doubling position under the action of the tooth number order;
FIG. 5 is a comparison graph of torque ripple of the motor of the present invention. The results were generated using finite element simulations, and it can be seen from the figure that after the modified structure was used, the torque ripple was reduced from the original 51% to 35.6%, the torque ripple optimization was significant, and there was almost no change in the average torque. Therefore, the method does not influence the main electromagnetic performance while effectively reducing the vibration noise, and directly proves the reliability and the practicability of the rotor modification method.
Fig. 6 is a flow chart of the harmonic attenuation rotor design according to the present invention, which embodies the flow of parameter selection, and particularly notes the steps of selecting two parameters, a and k (a), which play a major role in 11 th harmonic.
In conclusion, the design method of the low-vibration modification rotor structure comprises the steps of analyzing and determining main parameters of a motor, and respectively carrying out quantitative analysis on two modification methods; confirming the modification parameters, carrying out radial magnetic density and electromagnetic force analytic calculation, and judging whether the noise reduction requirement is met or not and the obvious degree of the noise reduction effect is met; drawing a modification curve, importing the modification curve, carrying out finite element analysis, and comparing the difference with the electromagnetic performance of the initial structure; by utilizing an acoustic boundary element method, the vibration acceleration and the sound pressure level of the surface of the shell are further calculated, the goodness of fit between theory and practice is checked, and the provided scheme can provide reference research for suppressing vibration noise and improving electromagnetic performance of the permanent magnet motor.
Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention shall fall within the protection scope defined by the appended claims.

Claims (3)

1. A design method for a low-vibration permanent magnet motor modification rotor is characterized by comprising the following specific steps:
step 1, analyzing structural parameters of a target permanent magnet motor, wherein the parameters comprise parameters of slot pole matching, stator inner and outer diameter, stator tooth width to tooth pitch ratio and air gap thickness between a stator and a rotor of the permanent magnet motor;
step 2, confirming a motor size model, carrying out modeling analysis on the motor, solving a radial magnetic density waveform and an electromagnetic force waveform of the motor by using an analytical method or finite element software, carrying out harmonic analysis, judging a harmonic order which mainly plays a role in vibration noise, then determining a proper rotor harmonic attenuation method, and determining a rotor modification formula and parameters of the formula;
step 3, after a rotor modification formula is determined, determining a rotor modification range, converting polar coordinate data into rectangular coordinates by using a coordinate conversion method, and drawing the surface shape of the modified motor rotor by using a point tracing method;
in the step 3, when the sine-minus-eleven-order harmonic attenuation method is adopted, in order to ensure that the air gap thickness is consistent with that of the sine-order harmonic attenuation method, the parameters k (a) and a in the formula (I) need to be constrained according to the formulas (III) and (IV); wherein h isgapThickness of air gap under initial rotor structure, hgap_sinIs the equivalent air gap thickness h after sine harmonic attenuationgap_sin-11The equivalent air gap thickness after the sine is weakened by the eleven harmonics;
Figure FDA0003510020230000011
Figure FDA0003510020230000012
step 4, importing the obtained rotor surface shape into finite element software, and analyzing the rotor model without modification to obtain performance indexes such as radial force harmonic amplitude, torque average value and torque pulsation after harmonic attenuation;
step 5, importing the whole structure model of the motor and the electromagnetic force calculation result after simulation into acoustic boundary element software, analyzing the structural mode and vibration noise of the motor to obtain a vibration noise result after the rotor is modified, and verifying the effectiveness of the invention;
the expression of the rotor harmonic attenuation method in the step 2 is as follows:
Figure FDA0003510020230000013
wherein θ represents a mechanical angle of the rotor modification range; ro(theta) represents the magnitude of the outer diameter of the rotor of the motor as a function of theta; riniThe size of the initial rotor outer diameter of the motor is represented; tau ispRepresenting the pole pitch of the motor rotor; a represents the magnitude of the eleven harmonic attenuation magnitudes; k (a) is an amount varying with a to adjust the air gap thickness of the motor to maintain the fundamental flux density amplitude within a stable range, and when a is 0 and k (a) is 1, formula (I) represents a sine harmonic attenuation method; if a ≠ 0, then equation (I) represents the sine-minus-eleven-harmonic attenuation method.
2. The design method of a low-vibration permanent magnet motor modification rotor according to claim 1, wherein in the step 3, in order to ensure the accuracy of the rotor structural shape, the number of the selected coordinate points is 100, and the scattered point coordinates are confirmed by using the conversion of polar coordinates and rectangular coordinates:
Figure FDA0003510020230000021
and finally, rotationally copying according to the actual period number of the motor, drawing a complete rotor surface shape, and storing the complete rotor surface shape for the next importing analysis operation.
3. The design method of the low-vibration permanent magnet motor modification rotor according to claim 1, wherein the low-vibration permanent magnet motor comprises a stator core (1), a rotor core (3) and magnetic steel (4), an armature winding adopts a double-layer short-distance distributed winding form, the winding span is 5, the magnetic steel adopts a V-shaped built-in structure, the permanent magnet material is N42UH, the included angle is 150 degrees, and the stator core and the rotor core are made of DW 310-35.
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