| The design,simulation,optimization and testing of permanent magnet synchronous motor(PMSM)for electric vehicles have been developed rapidly as a separate development direction and branch of electric vehicle(EV)industry.Through the research of this subject,we can master the design method of permanent magnet synchronous motor,the optimization method and improvement methods of related problems,accelerate the change step of replacing fuel vehicle by electric vehicle,and accelerate the development of permanent magnet synchronous motor cause in our country.All have positive significance.In this paper,a permanent magnet synchronous motor(PMSM)for electric vehicle with peak power of 130 kW and peak torque of 1700N?m is taken as the research object.Based on the magnetic circuit method,the basic design method of PMSM for electric vehicle is given,including the determination of the basic size of the motor,the selection of poles and slots number,the selection of stator and rotor steel material,the selection of the permanent magnet steel material of the rotor and the selection of structure type of rotor magnetic pole,including the angle of V-shaped magnetic pole and the selection of the thickness of flux barrier and rib region,The design of permanent magnet synchronous motor for other similar electric vehicles can also be used to complete the rapid design of the motor.The performance of the designed motor is calculated and analyzed by finite element method,and the no-load flux line distribution and the stator and rotor magnetic density distribution of the permanent magnet synchronous motor are obtained.The influence of different skewed pole angles on the cogging torque of permanent magnet synchronous motor(PMSM)is analyzed,and the best skewed angle is obtained.The sinusoidal property of no-load back electromotive force waveform of permanent magnet synchronous motor has been effectively improved by using non-uniform air gap.The effects of different stator current and different current advanced angle on rated torque and peak torque of permanent magnet synchronous motor(PMSM)are analyzed.Based on the principle of maximum torque per current control strategy,the minimum current and the optimal current advanced angle of rated torque and peak torque are determined.A method for judging the demagnetization of permanent magnet caused by high temperature is proposed,and the demagnetization of permanent magnet caused by large current and high temperature is analyzed.The risk that the centrifugal stress of the rotor of the designed permanent magnet synchronous motor(PMSM)may lead to deformation or fracture of the rotor rib region and web is evaluated.The torque-speed curve and efficiency map diagram of permanent magnet synchronous motor are calculated and compared with the test results of the prototype model motor.The simulation results are in good agreement with the test results.The torque of the permanent magnet synchronous motor designed in this paper is in good agreement,which proves the rationality of the motor design and the accuracy of the simulation calculation. |
