Analysis Of The Influence Of Different Core Materials On The Performance Of The Drive Motor Used In Electric Vehicles

The ever-increasing number of cars has increased the environmental pollution and energy crisis.Electric vehicles do not consume fossil energy and can achieve zero exhaust emissions,which has become a new direction for the development of auto companies.With the continuous innovation of technology,the operating efficiency of the drive motor for electric vehicles has encountered bottlenecks,and the use of new materials on motors to improve efficiency has become a breakthrough.Amorphous alloy material is a new type of green material that can maintain low loss characteristics at higher magnetic field frequencies and has been widely used in power equipment such as transformers.In this thesis,the effects of different materials on the performance of permanent magnet synchronous motors(PMSM)are studied in the electromagnetic design,structural optimization and temperature field analysis.The work of this thesis is of great significance for improving the performance of permanent magnet synchronous motors for electric vehicles.Firstly,according to the design goals the motor design is performed.The finite element software is used to analyze the motor model.The stator core of two motors is made of of amorphous alloy material and silicon steel material respetivily.The cogging torque and internal magnetic field distribution of the two motors under no-load and load conditions are compared and analyzed.Electromagnetic performance of the motor's output torque,three-phase current and core loss are calculated.Secondly,the prototype of the above-mentioned first-generation motor was tested.The experimental data was analyzed and found that the first-generation amorphous alloy motor was less efficient under low-speed and high-torque conditions.The second-generation motor design goals are put forward in conjunction with actual application requirements.The optimization was carried out by using the scan optimization method to obtain the second-generation motor.The finite element analysis software was used to analyze the electromagnetic performance of the second-generation motor under no-load and load conditions.Compared with the first-generation amorphous alloy motor,the second-generation motor can meet the design goals.Thirdly,the finite volume method is used to analyze the temperature distribution of the second generation motor.The 3D drawing software is used to draw the motor model and mesh it,and the second generation motor transient temperature field analysis and calculation is completed after analyzing the thermal parameters.The simulation results show that the temperature of amorphous alloy motor is higher than the silicon steel motor under rated and peak conditions,but lower than that of silicon steel motor under high speed conditions.Finally,the prototype manufacturing and experimental platform construction of the first generation motor and the second generation motor were introduced.The electromagnetic performance test of the first generation motor and the second generation motor was completed,and the accuracy of the finite element analysis model was verified.The temperature rise experiment of the second generation motor was carried out,and the obtained results were compared with the simulation data to verify that the model was reasonable and the results were accurate and effective.In order to improve the temperature rise performance of amorphous alloy motor,a manufacturing process for reducing the temperature rise of the stator part of the motor is introduced.