Permanent Magnet Synchronous Motor Pole Structure Optimization Method and System Based on Equal Thickness Air Gap

Abstract

The present disclosure provides an optimization method and system for the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap, which relates to the technical field of permanent magnet synchronous motor pole optimization. The ideal change trend of the air gap magnetic flux density of the permanent magnet synchronous motor with equal-thickness air gap and the initial structure design expression of the pole thickness are determined; considering the tooth-slot effect, the initial pole thickness is determined; the initial pole thickness is subjected to fast Fourier decomposition to obtain the fundamental wave of the pole thickness and the coefficients of each odd harmonic; a two-dimensional electromagnetic simulation model of the permanent magnet synchronous motor with equal-thickness air gap is constructed, the fundamental wave of the pole thickness and the coefficients of each odd harmonic are set as the initial values of the pole thickness of the two-dimensional electromagnetic simulation model, the fundamental wave of the pole thickness and the coefficients of each odd harmonic are used as optimization variables, a target function is constructed with the minimum torque ripple and the maximum average torque as the objectives, and the fundamental wave of the pole thickness and the coefficients of each odd harmonic are optimized using a multi-objective genetic algorithm to determine the optimal pole thickness.

Description

Technical Field

[0001] The present disclosure relates to the technical field of permanent magnet synchronous motor pole optimization, and specifically to a method and system for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap. Background Art

[0002] The statements in this section merely provide background technical information related to the present disclosure and do not necessarily constitute prior art.

[0003] Permanent magnet synchronous motors have advantages such as high torque density, high power factor, high reliability, and high efficiency, and are currently widely used in fields such as aerospace, transportation, medical, and national defense.

[0004] The rotors of existing surface-mounted permanent magnet synchronous motors usually use poles that have not undergone pole shaving treatment. The poles of this type of motor are fan-shaped, and the harmonic content of the air gap magnetic field generated by such poles is high, resulting in large cogging torque and torque ripple of the motor, generating significant vibration and noise, and affecting the control accuracy and positioning accuracy of the entire machine equipment.

[0005] In order to reduce the cogging torque and torque ripple of the motor and improve the control accuracy of the equipment, in the prior art, there are two pole shaving techniques, eccentric pole shaving and sinusoidal pole shaving, to optimize the poles of surface-mounted permanent magnet synchronous motors. Among them, sinusoidal pole shaving utilizes the characteristic that the relative permeability of the permanent magnet is close to that of air, and the upper surface of the traditional fan-shaped pole or bow-shaped pole is shaved into a sinusoidal shape to obtain an air gap magnetic flux density close to a sine wave. This structure can significantly suppress the cogging torque and torque fluctuation of the motor. However, the sinusoidal pole structure will consume too much magnetomotive force in the air gap, resulting in low utilization rate of the permanent magnet, a decrease in the fundamental wave amplitude of the air gap magnetic flux density, and a decrease in the output average torque, affecting the torque density and operating efficiency of the motor. In addition, the sinusoidal poles in the prior art need to be assembled on the rotor surface, and both the inner surface of the pole and the edge of the rotor are pure arcs or straight lines, requiring high assembly accuracy and making the pole assembly difficult. Summary of the Invention

[0006] In order to solve the above problems, the present disclosure proposes a method and system for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap. By shaving the inner surface of the poles of the permanent magnet synchronous motor, while improving the sinusoidality of the air gap magnetic flux density, it is also possible to reduce the assembly accuracy requirements, facilitate pole assembly, and reduce the cogging torque and torque ripple of the motor.

[0007] According to some embodiments, the present disclosure adopts the following technical solutions:

[0008] A method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap, comprising:

[0009] Determine the ideal change trend of the air-gap flux density of the equal-thickness air-gap permanent magnet synchronous motor and the initial structural design expression of the pole thickness;

[0010] Considering the slotting effect, establish the change equation of the air-gap flux density with the change of the pole thickness, and determine the initial pole thickness; perform fast Fourier decomposition on the initial pole thickness to obtain the fundamental wave of the pole thickness and the coefficients of each odd harmonic;

[0011] Construct a two-dimensional electromagnetic simulation model of the equal-thickness air-gap permanent magnet synchronous motor, set the fundamental wave of the pole thickness and the coefficients of each odd harmonic as the initial values of the pole thickness of the two-dimensional electromagnetic simulation model, use the fundamental wave of the pole thickness and the coefficients of each odd harmonic as optimization variables, construct an objective function with the minimum torque ripple and the maximum average torque as the goals, and use the multi-objective genetic algorithm to optimize the fundamental wave of the pole thickness and the coefficients of each odd harmonic to determine the optimal pole thickness.

[0012] According to some embodiments, the present disclosure adopts the following technical solutions:

[0013] A permanent magnet synchronous motor pole optimization system based on an equal-thickness air gap, comprising:

[0014] An initialization module for determining the ideal change trend of the air-gap flux density of the equal-thickness air-gap permanent magnet synchronous motor and the initial structural design expression of the pole thickness;

[0015] A pole optimization module for considering the slotting effect, establishing the change equation of the air-gap flux density with the change of the pole thickness, determining the initial pole thickness; performing fast Fourier decomposition on the initial pole thickness to obtain the fundamental wave of the pole thickness and the coefficients of each odd harmonic;

[0016] An optimization and solution module for constructing a two-dimensional electromagnetic simulation model of the equal-thickness air-gap permanent magnet synchronous motor, setting the fundamental wave of the pole thickness and the coefficients of each odd harmonic as the initial values of the pole thickness of the two-dimensional electromagnetic simulation model, using the fundamental wave of the pole thickness and the coefficients of each odd harmonic as optimization variables, constructing an objective function with the minimum torque ripple and the maximum average torque as the goals, and using the multi-objective genetic algorithm to optimize the fundamental wave of the pole thickness and the coefficients of each odd harmonic to determine the optimal pole thickness.

[0017] According to some embodiments, the present disclosure adopts the following technical solutions:

[0018] A non-transitory computer-readable storage medium for storing computer instructions, which when executed by a processor, implement the permanent magnet synchronous motor pole structure optimization method based on an equal-thickness air gap.

[0019] According to some embodiments, the present disclosure adopts the following technical solutions:

[0020] An electronic device, comprising: a processor, a memory, and a computer program; wherein, the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device runs, the processor executes the computer program stored in the memory to enable the electronic device to execute the method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap as described above.

[0021] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0022] A method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap proposed by the present disclosure takes into account the relative permeability of the permanent magnet and the slotting effect, and uses a method combining analytical analysis and finite element analysis, which can save time and greatly reduce the workload of motor design on the premise of ensuring accuracy.

[0023] The shape of the upper surface of the pole designed by the present invention fits the outer surface of the motor rotor, and the formed air gap has an equal thickness in the entire circumferential space. While improving the sinusoidality of the air gap magnetic flux density, it can also reduce the assembly accuracy requirements, facilitate pole assembly, and is beneficial to reducing the cogging torque and torque ripple of the motor, making the permanent magnet synchronous motor using this pole have the advantages of high power density, smooth operation, low vibration and noise, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The specification drawings forming a part of the present disclosure are used to provide a further understanding of the present disclosure. The schematic embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation to the present disclosure.

[0025] Figure 1 It is a flowchart of the method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap according to an embodiment of the present disclosure;

[0026] Figure 2 It is a schematic diagram of the stator structure of the motor according to an embodiment of the present disclosure;

[0027] Figure 3 It is a schematic diagram showing the variation of the pole thickness with the spatial angle according to an embodiment of the present disclosure;

[0028] Figure 4 It is a schematic diagram of the motor rotor structure with the initial designed pole, i.e., Model 1, according to an embodiment of the present disclosure;

[0029] Figure 5 It is a schematic diagram of the motor rotor structure with the pole designed considering the slotting effect, i.e., Model 2, according to an embodiment of the present disclosure;

[0030] Figure 6 It is a schematic diagram of the motor rotor structure with the optimal pole, i.e., Model 3, according to an embodiment of the present disclosure;

[0031] Figure 7It is the output torque result diagram of motors with different rotor structures according to embodiments of the present disclosure. Detailed implementation manners

[0032] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further descriptions of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs.

[0034] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] Embodiment 1

[0036] In an embodiment of the present disclosure, an optimization method for the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap is provided, including:

[0037] Step 1: Determine the ideal change trend of the air gap magnetic flux density of the permanent magnet synchronous motor with an equal-thickness air gap and the initial structure design expression of the pole thickness;

[0038] Step 2: Considering the slotting effect, establish a change equation of the air gap magnetic flux density with the change of the pole thickness, and determine the initial pole thickness; perform a fast Fourier decomposition on the initial pole thickness to obtain the fundamental wave of the pole thickness and the coefficients of each odd harmonic;

[0039] Step 3: Construct a two-dimensional electromagnetic simulation model of the permanent magnet synchronous motor with an equal-thickness air gap, set the fundamental wave of the pole thickness and the coefficients of each odd harmonic as the initial values of the pole thickness of the two-dimensional electromagnetic simulation model, use the fundamental wave of the pole thickness and the coefficients of each odd harmonic as optimization variables, construct an objective function with the minimum torque ripple and the maximum average torque as the objectives, and use a multi-objective genetic algorithm to optimize the fundamental wave of the pole thickness and the coefficients of each odd harmonic to determine the optimal pole thickness.

[0040] As an embodiment, this embodiment relates to a design optimization method for the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap. Taking a 6-slot 4-pole surface-mounted permanent magnet synchronous motor as an example, as Figure 1 shown is the flow chart of the pole structure design method, and its pole structure optimization design method includes the following steps:

[0041] Step 1: Determine the air gap flux density B of the designed permanent magnet synchronous motor with equal air gap thickness g The ideal change trend of (θ) is used to determine the original design expression of the magnetic pole thickness of the permanent magnet synchronous motor with equal air gap;

[0042] Step 2: Consider the cogging effect and establish the air gap flux density B g (θ) changes with the pole thickness Δhpm(θ) of the constant-thickness air-gap permanent magnet synchronous motor:

[0043]

[0044] Among them, B r Represents the remanence of the permanent magnet, μ r Represents the relative magnetic permeability of the permanent magnet, l g Indicates the air gap length, K s (θ) represents the cogging effect factor of the motor.

[0045] Step 3: Air gap flux density B g (θ) changes with the thickness of the permanent magnet synchronous motor pole Δh pm (θ) is solved simultaneously to determine the initial magnetic pole thickness of the permanent magnet synchronous motor;

[0046] Step 4: Perform fast Fourier decomposition on the initial magnetic pole thickness of the permanent magnet synchronous motor determined in step 3 to obtain the fundamental wave of the magnetic pole thickness and the coefficients of each odd harmonic;

[0047] Step 5: Establish a two-dimensional electromagnetic simulation model of the permanent magnet synchronous motor with equal air gap thickness, set the coefficients of the fundamental wave of the magnetic pole thickness and each odd harmonic determined in step 4 as the initial value of the magnetic pole thickness of the simulation model, use the coefficients of the fundamental wave of the magnetic pole thickness and each odd harmonic as optimization variables, and use the minimum torque pulsation and the maximum average torque as the objective function. Use a multi-objective genetic algorithm through finite element software to optimize the coefficients of the fundamental wave of the magnetic pole thickness and each odd harmonic to determine the optimal magnetic pole thickness.

[0048] Preferably, the inner diameter of the motor stator is 51 mm, and the outer diameter is 88 mm. The schematic diagram of the motor stator structure is as follows: Figure 2 shown.

[0049] Specifically, in step 1, the ideal change trend of the air gap magnetic flux density of the permanent magnet synchronous motor with equal air gap thickness is a sinusoidal change, and the expression is:

[0050] B g (θ)=B gm sin(pθ)

[0051] Among them, θ represents the spatial angle from the pole bottom radius to the pole bottom edge line, B g$(\theta)$ represents the air-gap flux density, $B$ gm represents the fundamental wave amplitude of the air-gap flux density, which takes a value of 0.8 T in this embodiment. $p$ represents the number of pole pairs of the motor, which takes a value of 2 in this embodiment.

[0052] The original design of the pole thickness of the constant-thickness air-gap permanent magnet synchronous motor varies sinusoidally. The pole thickness $\Delta h$ pm The expression of $(\theta)$ is

[0053] $\Delta h$ pm $(\theta)=h$ pm $_{max}\sin(p\theta)$

[0054] where $h$ pm $_{max}$ represents the maximum thickness of the pole, which takes a value of 3.6 mm in this embodiment. The schematic diagram of the variation trend of the pole thickness with the spatial angle $\theta$ is as Figure 3 shown. The schematic diagram of the rotor structure obtained from the initial design is as Figure 4 shown, which is called Model 1 in this embodiment.

[0055] In step 2, considering the tooth-slot effect, the tooth-slot effect influence factor $K$ s The expression of $(\theta)$ is:

[0056]

[0057]

[0058] where $w$ s represents the slot opening width of the motor, $t$ represents the tooth pitch of the motor, and $\sigma$ sm represents the slot width reduction factor of the motor, and its expression is

[0059]

[0060] In step 3, the initial pole thickness of the constant-thickness air-gap permanent magnet synchronous motor is the solution of the following equation. The schematic diagram of the obtained rotor structure is as Figure 5 shown, which is called Model 2 in this embodiment.

[0061]

[0062] In step 4, for the initial pole thickness of the permanent magnet synchronous motor determined in step 3, taking $1 / p$ of the circumference of the rotor outer diameter (i.e., twice the arc length of the outer diameter of a single pole) as a period, a fast Fourier transform is performed to obtain the coefficients of the fundamental wave and each odd harmonic of the pole thickness;

[0063] Preferably, the coefficients of each odd harmonic of the pole thickness are the coefficients of the 3rd, 5th, 7th, 9th, and 11th harmonics. Then the expression of the pole thickness $\Delta h_{pm}(\theta)$ is

[0064] Δhpm(θ) = hpm1sin(pθ) + hpm3sin(3pθ) + hpm5sin(5pθ) +

[0065] hpm7sin(7pθ) + hpm9sin(9pθ) + hpm11sin(11pθ)

[0066] where h pm1 is the fundamental wave coefficient, i.e., the fundamental wave amplitude, h pm3 , h pm5 , h pm7 , h pm9 , and h pm11 are the coefficients / amplitudes of the 3rd, 5th, 7th, 9th, and 11th harmonic waves respectively.

[0067] Preferably, the shape of the upper top surface of the permanent magnet synchronous motor pole is an arc surface that fits the outer surface of the motor rotor. The radius of this arc surface is determined by the radius of the motor rotor, and the air gap formed between it and the motor stator is an equal-thickness air gap.

[0068] Preferably, the difference between the radius of the motor rotor and the pole thickness is the expression of the curve r(θ) on the inner surface of the pole in the polar coordinate system

[0069] r(θ) = R - Δhpm(θ)

[0070] where R represents half of the outer diameter of the motor rotor, and in this embodiment, its value is 25 mm.

[0071] Preferably, the magnetization method of the pole is radial magnetization.

[0072] In step 5, a two-dimensional electromagnetic simulation model (the combination of the stator and the rotor) of the equal-thickness air gap permanent magnet synchronous motor is constructed. The analytical pole thickness is initially calculated using analytical analysis and corrected in combination with the finite element method to obtain the optimal pole thickness.

[0073] Specifically, the fundamental wave of the pole thickness and the coefficients of each odd harmonic wave are set as the initial values of the pole thickness of the two-dimensional electromagnetic simulation model. Using the fundamental wave of the pole thickness and the coefficients of each odd harmonic wave as optimization variables, a target function is constructed with the minimum torque ripple and the maximum average torque as the objectives, as shown in the following formula. The multi-objective genetic algorithm is used to optimize the fundamental wave of the pole thickness and the coefficients of each odd harmonic wave.

[0074]

[0075] where T rp represents the torque ripple of the motor, and T avg represents the average torque of the motor.

[0076] According to the above method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap, the schematic diagram of the motor rotor structure finally obtained is as shown in Figure 6 shown, which is referred to as Model 3 in this embodiment.

[0077] Perform finite element simulation verification on the final result. The output torque result diagrams of different models are as shown in Figure 7 shown. It can be seen from the result comparison that the permanent magnet synchronous motor with the optimal poles, i.e., Model 3, has the smallest torque ripple and the average output torque remains unchanged.

[0078] The method for designing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap proposed in this disclosure takes into account the relative permeability of the permanent magnet and the slotting effect, and uses a method combining analytical analysis and finite element analysis. It can save time and greatly reduce the workload of motor design on the premise of ensuring accuracy.

[0079] The shape of the upper surface of the pole designed in this disclosure fits the outer surface of the motor rotor, and the formed air gap has an equal thickness in the entire circumferential space, which is convenient for assembly. While improving the sinusoidality of the air gap magnetic flux density, it can also reduce the assembly accuracy requirements, facilitate the assembly of the poles, and is beneficial to reducing the cogging torque and torque ripple of the motor, improving the motor control accuracy and positioning accuracy. The special shape of the pole improves the sinusoidality of the air gap magnetic flux density of the motor, making the permanent magnet synchronous motor with this pole have the advantages of high power density, smooth operation, low vibration and noise, etc.

[0080] Embodiment 2

[0081] In an embodiment of this disclosure, a system for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap is provided, including:

[0082] An initialization module, which is used to determine the ideal change trend of the air gap magnetic flux density of the permanent magnet synchronous motor with an equal-thickness air gap and the initial structure design expression of the pole thickness;

[0083] A pole optimization module, which is used to consider the slotting effect, establish a change equation of the air gap magnetic flux density with the change of the pole thickness, and determine the initial pole thickness; perform a fast Fourier decomposition on the initial pole thickness to obtain the fundamental wave of the pole thickness and the coefficients of each odd harmonic;

[0084] An optimization and solution module, which is used to construct a two-dimensional electromagnetic simulation model of the permanent magnet synchronous motor with an equal-thickness air gap, set the fundamental wave of the pole thickness and the coefficients of each odd harmonic as the initial values of the pole thickness of the two-dimensional electromagnetic simulation model, use the fundamental wave of the pole thickness and the coefficients of each odd harmonic as optimization variables, construct an objective function with the minimum torque ripple and the maximum average torque as the goals, and use a multi-objective genetic algorithm to optimize the fundamental wave of the pole thickness and the coefficients of each odd harmonic to determine the optimal pole thickness.

[0085] Example 3

[0086] In one embodiment of the present disclosure, a non-transitory computer-readable storage medium is provided. The non-transitory computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by a processor, the method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap as described above is implemented.

[0087] Example 4

[0088] In one embodiment of the present disclosure, an electronic device is provided, including: a processor, a memory, and a computer program; wherein, the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device runs, the processor executes the computer program stored in the memory so that the electronic device executes the method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap as described above.

[0089] The present disclosure is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in one or more flows and / or one or more blocks. Figure 1 one or more flows and / or Figure 1 one or more blocks.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing devices, such that a series of operation steps are executed on the computer or other programmable devices to generate a computer-implemented process, so that the instructions executed on the computer or other programmable devices provide steps for implementing the functions specified in one or more flows and / or one or more blocks. Figure 1 one or more flows and / or Figure 1 one or more blocks.

[0091] Although the specific embodiments of the present disclosure have been described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present disclosure. Those skilled in the art should understand that based on the technical solutions of the present disclosure, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present disclosure.

Claims

1. A method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap, characterized in that Including: Determine the ideal change trend of the air-gap flux density of the equal-thickness air-gap permanent magnet synchronous motor and the initial structural design expression of the pole thickness; Considering the tooth-slot effect, establish the change equation of the air-gap flux density with the change of the pole thickness, and determine the initial pole thickness; Perform fast Fourier decomposition on the initial pole thickness to obtain the fundamental wave of the pole thickness and the coefficients of each odd harmonic; Construct a two-dimensional electromagnetic simulation model of the equal-thickness air-gap permanent magnet synchronous motor, set the fundamental wave of the pole thickness and the coefficients of each odd harmonic as the initial values of the pole thickness of the two-dimensional electromagnetic simulation model, use the fundamental wave of the pole thickness and the coefficients of each odd harmonic as optimization variables, construct an objective function with the minimum torque ripple and the maximum average torque as the goals, and use the multi-objective genetic algorithm to optimize the fundamental wave of the pole thickness and the coefficients of each odd harmonic to determine the optimal pole thickness.

2. The method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap as claimed in claim 1, wherein The ideal change trend of the air-gap flux density of the equal-thickness air-gap permanent magnet synchronous motor is sinusoidal change. Design the initial structure of the pole thickness according to the sinusoidal change, and construct the initial structure design expression of the pole thickness according to the sinusoidal change.

3. The method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap as claimed in claim 1, wherein Considering the tooth-slot effect, determine the expression of the tooth-slot effect influence factor of the equal-thickness air-gap permanent magnet synchronous motor, and determine the expression of the slot width reduction factor of the equal-thickness air-gap permanent magnet synchronous motor to obtain the initial pole thickness expression of the equal-thickness air-gap permanent magnet synchronous motor.

4. The method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap as claimed in claim 1, wherein The coefficients of each odd harmonic of the pole thickness are the coefficients of the 3rd, 5th, 7th, 9th, and 11th harmonics respectively.

5. The method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap as claimed in claim 1, wherein The upper top surface shape of the permanent magnet synchronous motor pole is an arc surface that fits the outer surface of the motor rotor. The radius of this arc surface is determined by the radius of the motor rotor. The air-gap formed between it and the motor stator is an equal-thickness air-gap. The difference between the motor rotor radius and the pole thickness is the expression of the inner surface curve of the pole in the polar coordinate system.

6. The method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap as claimed in claim 1, wherein The magnetization method of the pole is radial magnetization.

7. The method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap as claimed in claim 1, wherein Use the multi-objective genetic algorithm to analyze the pole thickness and combine with the finite element to correct it to obtain the optimal pole thickness.

8. A permanent magnet synchronous motor pole optimization system based on an equal-thickness air gap, characterized in that Including: An initialization module for determining the ideal change trend of the air-gap flux density of the equal-thickness air-gap permanent magnet synchronous motor and the initial structural design expression of the pole thickness; A pole optimization module for considering the tooth-slot effect, establishing the change equation of the air-gap flux density with the change of the pole thickness, and determining the initial pole thickness; Perform fast Fourier decomposition on the initial pole thickness to obtain the fundamental wave of the pole thickness and the coefficients of each odd harmonic; An optimization solution module for constructing a two-dimensional electromagnetic simulation model of the equal-thickness air-gap permanent magnet synchronous motor, setting the fundamental wave of the pole thickness and the coefficients of each odd harmonic as the initial values of the pole thickness of the two-dimensional electromagnetic simulation model, using the fundamental wave of the pole thickness and the coefficients of each odd harmonic as optimization variables, constructing an objective function with the minimum torque ripple and the maximum average torque as the goals, and using the multi-objective genetic algorithm to optimize the fundamental wave of the pole thickness and the coefficients of each odd harmonic to determine the optimal pole thickness.

9. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by a processor, the method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air-gap as described in any one of claims 1-7 is implemented.

10. An electronic device, characterized in that, Including: A processor, a memory, and a computer program; wherein, the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device runs, the processor executes the computer program stored in the memory so that the electronic device executes the method for optimizing the pole structure of a permanent magnet synchronous motor based on an equal-thickness air gap as described in any one of claims 1-7.

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