阅读说明：本技术 一种电动汽车永磁同步电机效率的优化方法及系统 (Method and system for optimizing efficiency of permanent magnet synchronous motor of electric vehicle ) 是由 张德胜 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种电动汽车永磁同步电机效率的优化方法及系统。本发明涉及的一种电动汽车永磁同步电机效率的优化方法，其特征在于，包括步骤：S11.对电机损耗进行分析，并得到分析结果；所述损耗包括机械损耗、铜损耗和铁损耗；S12.根据电机损耗分析结果对永磁同步电机进行优化；所述优化包括磁钢沿轴向分段、增加电机凸极率。本发明通过效率优化方法，可以进一步降低损耗，得到各个工况下的准确损耗计算结果，从而确定电机的计算效率，并可以针对特定工况对电机效率进行优化。(The invention discloses a method and a system for optimizing efficiency of a permanent magnet synchronous motor of an electric vehicle. The invention relates to an optimization method of efficiency of a permanent magnet synchronous motor of an electric automobile, which is characterized by comprising the following steps: s11, analyzing the motor loss to obtain an analysis result; the losses include mechanical, copper and iron losses; s12, optimizing the permanent magnet synchronous motor according to the motor loss analysis result; the optimization comprises the steps that the magnetic steel is segmented along the axial direction, and the salient pole rate of the motor is increased. According to the invention, through the efficiency optimization method, the loss can be further reduced, and the accurate loss calculation result under each working condition is obtained, so that the calculation efficiency of the motor is determined, and the motor efficiency can be optimized aiming at the specific working condition.)

1. The optimization method of the efficiency of the permanent magnet synchronous motor of the electric automobile is characterized by comprising the following steps:

s1, analyzing the motor loss to obtain an analysis result; the losses include mechanical, copper and iron losses;

s2, optimizing the permanent magnet synchronous motor according to the motor loss analysis result; the optimization comprises the steps that the magnetic steel is segmented along the axial direction, and the salient pole rate of the motor is increased.

2. The method for optimizing the efficiency of the permanent magnet synchronous motor of the electric automobile according to claim 1, wherein the magnetic steel is segmented along the axial direction, so that the eddy current loss of the magnetic steel is reduced, and the motor efficiency is improved.

3. The method of claim 1, wherein the increasing of the motor saliency is the increasing of the motor saliency through optimizing of the number of rotor pole laminations.

4. The method for optimizing the efficiency of the permanent magnet synchronous motor of the electric automobile according to claim 3, wherein the number of the optimized rotor magnetic poles is two.

5. The utility model provides an optimization system of electric automobile PMSM efficiency which characterized in that includes:

the analysis module is used for analyzing the motor loss and obtaining an analysis result; the losses include mechanical, copper and iron losses;

the optimization module is used for optimizing the permanent magnet synchronous motor according to the motor loss analysis result; the optimization comprises the steps that the magnetic steel is segmented along the axial direction, and the salient pole rate of the motor is increased.

6. The method for optimizing the efficiency of the permanent magnet synchronous motor of the electric automobile according to claim 5, wherein the magnetic steel is segmented along the axial direction, so that the eddy current loss of the magnetic steel is reduced, and the motor efficiency is improved.

7. The method of claim 5, wherein the increasing of the motor saliency is the increasing of the motor saliency through optimizing the number of rotor pole laminations.

8. The method for optimizing efficiency of the permanent magnet synchronous motor of the electric automobile according to claim 7, wherein the number of the optimized rotor magnetic poles is two.

Technical Field

The invention relates to the technical field of vehicle communication, in particular to a method and a system for optimizing efficiency of a permanent magnet synchronous motor of an electric vehicle.

Background

With the development of society, electric automobiles have become the trend of the development of the society at present, and compared with internal combustion engine automobiles, electric automobiles have the advantages of high efficiency, no pollution, low noise and the like. The development of high-performance electric vehicles is highly regarded by governments, automobile manufacturers and scientific research institutes of various countries, electric vehicle development plans are made in many times, and the development enthusiasm of electric vehicles in the global range is raised. Meanwhile, electric vehicles have increasingly high requirements on efficiency, power density, cost performance, safety and the like of driving motors. The built-in permanent magnet synchronous motor has the advantages of high power density, large low-speed output torque, small volume, capability of improving the motor efficiency and the speed regulation characteristic by utilizing the reluctance effect, and the like, and is particularly suitable for being used as a driving motor of an electric automobile.

The magnetic poles of the permanent magnet motor are composed of magnetic steel. Because the output voltage of the frequency converter contains a large amount of higher harmonics, larger harmonic loss can be generated in the motor, and higher temperature rise is caused. When a permanent magnet motor connected with a frequency converter runs under the environment conditions of high temperature and strong magnetic field for a long time, if the temperature resistance of the magnetic steel is poor, the magnetic steel is easy to have poor magnetic performance, irreversible demagnetization and other poor results, so that the magnetic steel fails, the permanent magnet motor cannot work, and the damage always starts from the highest point of the local temperature rise of the magnetic pole.

The highest point of the local temperature rise of the magnetic pole depends on the heat dissipation condition of the position on one hand, and is closely related to the eddy current loss of the magnetic steel of the position on the other hand. The efficiency and the loss of the motor of the automobile are closely related, so the efficiency of the motor needs to be optimized, and the calculation of the efficiency of the motor of the automobile needs to accurately analyze and calculate the loss of the motor. The invention provides an optimization method of efficiency of a permanent magnet synchronous motor of an electric automobile, which aims at optimizing the efficiency of the motor.

Disclosure of Invention

The invention aims to provide a method and a system for optimizing the efficiency of a permanent magnet synchronous motor of an electric vehicle, aiming at the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for optimizing the efficiency of a permanent magnet synchronous motor of an electric automobile comprises the following steps:

s1, analyzing the motor loss to obtain an analysis result; the losses include mechanical, copper and iron losses;

s2, optimizing the permanent magnet synchronous motor according to the motor loss analysis result; the optimization comprises the steps that the magnetic steel is segmented along the axial direction, and the salient pole rate of the motor is increased.

Furthermore, the magnetic steel reduces the eddy current loss of the magnetic steel along the axial direction in a segmented mode, and the motor efficiency is improved.

Further, the increasing of the motor saliency is the motor saliency increased by optimizing the number of rotor magnetic pole laminations.

Furthermore, the number of the optimized rotor magnetic pole layers is two.

Correspondingly, still provide an optimization system of electric automobile PMSM efficiency, include:

the analysis module is used for analyzing the motor loss and obtaining an analysis result; the losses include mechanical, copper and iron losses;

the optimization module is used for optimizing the permanent magnet synchronous motor according to the motor loss analysis result; the optimization comprises the steps that the magnetic steel is segmented along the axial direction, and the salient pole rate of the motor is increased.

Furthermore, the magnetic steel reduces the eddy current loss of the magnetic steel along the axial direction in a segmented mode, and the motor efficiency is improved.

Further, the increasing of the motor saliency is the motor saliency increased by optimizing the number of rotor magnetic pole laminations.

Furthermore, the number of the optimized rotor magnetic pole layers is two.

Compared with the prior art, the method can further reduce the loss through the efficiency optimization method, obtain accurate loss calculation results under various working conditions, further determine the calculation efficiency of the motor, and optimize the efficiency of the motor according to specific working conditions.

Drawings

FIG. 1 is a diagram of a system for optimizing efficiency of a PMSM of an electric vehicle according to an embodiment;

FIG. 2 is a schematic diagram of an analysis of the number of optimal magnetic steel layers provided in the first embodiment;

fig. 3 is a flowchart of a method for optimizing efficiency of a permanent magnet synchronous motor of an electric vehicle according to a second embodiment.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

The invention aims to provide a method and a system for optimizing the efficiency of a permanent magnet synchronous motor of an electric vehicle, aiming at the defects of the prior art.