Electromagnetic Design And Torque Performance Optimization Of Double V Built-in Permanent Magnet Synchronous Motor For Vehicle

With the advantages of high power density and high torque density,permanent magnet synchronous motor has become a hot research topic.The permanent magnet of the motor is also developed from the surface-attached structure to the built-in structure.Double V permanent magnet synchronous motor for vehicle is a new type of built-in permanent magnet synchronous motor.Compared with traditional single-layer V-type permanent magnet synchronous motor.The reluctance torque can be used more fully.To a certain extent,the efficiency and power density of the motor are improved.In this paper,the electromagnetic design and torque performance optimization of dual V built-in permanent magnet synchronous motor for vehicles are studied.Firstly,the research background and significance of this paper are expounded.The research status of external and built-in permanent magnet synchronous motor in China is analyzed.The necessity of motor structure optimization and motor control strategy for motor torque performance optimization is discussed.Secondly,the performance requirements of double V built-in permanent magnet synchronous motor are analyzed.The main size and electromagnetic design of the motor are also discussed.Including the motor pole groove fit,motor winding scheme,stator groove type,motor rotor and its permanent magnet structure.Furthermore,Maxwell finite element simulation is used to analyze the static and transient performance of the motor.The tooth groove torque,no-load and load back potential,average torque,torque ripple and efficiency Map of double V built-in permanent magnet synchronous motor for vehicle are studied.The corresponding analysis is carried out to ensure that the motor meets the design requirements.The rationality of the motor design is verified.Then,the torque performance of the motor body structure is optimized.A new auxiliary slotting method is studied.The tooth groove torque of the motor is optimized from three aspects: stator side opening symmetrical auxiliary groove,rotor side opening symmetrical auxiliary groove and fixed rotor simultaneously opening symmetrical auxiliary groove.In addition,the optimization of multiple motor auxiliary slots and the simultaneous optimization of multiple motor output performance are discussed.A co-simulation optimization method based on particle swarm optimization is studied.The rotor torque and torque ripple of the tooth groove of the double V built-in permanent magnet synchronous motor can be effectively reduced.And improve the average torque of the motor,to reduce the motor vibration noise and improve the motor output has a great promotion role.Finally,by studying the basic principle and design method of linear self-turbulent current loop controller,the d-q axial self-turbulent control current loop controller is studied to suppress the current loop harmonic disturbance and improve the system control performance of motor d-q current,and then improve the torque performance of the motor.And the data transfer path is provided by ANSYS Simplore simulation software to connect the Maxwell motor finite element simulation model with MATLAB/Simulink simulation software to realize the joint simulation of motor body and control.By comparing and analyzing the motor current and torque data obtained from the joint simulation experiment,it is verified that the linear self-rejecting current loop controller The feasibility of significantly improving the torque performance of the motor is verified.