Design Of Permanent Magnet Assisted Synchronous Reluctance Motor For New Energy Vehicle

New energy vehicles are the current trend of development in this era,and as traditional energy sources are being depleted,countries are increasing their research and development efforts on new energy sources.In the context of large-scale development of new energy,the promotion and gradual popularization of new energy vehicles has been introduced to promote sustainable energy use and environmental protection.As one of the three core components of new energy vehicles,the electric motor has always been a focus of attention.Permanent magnet-assisted synchronous reluctance motors are motors that combine the characteristics of both permanent magnet synchronous motors and synchronous reluctance motors.Due to their wide range of speed control,low rare earth usage,and high power density,Permanent magnet-assisted synchronous reluctance motors have been the subject of extensive research by many experts and scholars.This paper presents a Permanent magnet-assisted synchronous reluctance motors design based on the performance requirements of electric motors for new energy vehicles.The paper first introduces the selection and application of driving motors for new energy vehicles,and explains the research significance and practical value of Permanent magnet-assisted synchronous reluctance motors based on its unique motor characteristics.Furthermore,the paper describes the origin and development history of Permanent magnet-assisted synchronous reluctance motors and presents the research status and application of Permanent magnet-assisted synchronous reluctance motors both domestically and internationally.Based on the operating characteristics of the motor,the paper analyzes its working principle and uses magnetic circuit analysis to analyze various operating conditions.Derivation of Analytical Expression for Torque in Permanent Magnet Assisted Synchronous Reluctance Motor with Three Layers of Magnetic Barriers and then analyzes the effect of various rotor structural parameters on motor torque,in order to reduce the disadvantage of torque ripple in Permanent magnet-assisted synchronous reluctance motors.Secondly,the paper calculates the main dimensional parameters of the electric motor based on the performance indicators required for new energy vehicles,and then selects the specific structure of the motor.By comparing the influence of different structural parameters on the motor performance and combining with the motor principle,suitable pole slot combinations,winding types,and rotor structures are selected to determine the best motor selection.Finite element electromagnetic field simulation is carried out by building a motor model,and the motor performance under different operating conditions is calculated and analyzed.At the same time,various types of motor losses and motor efficiency under losses are calculated,and segmented permanent magnet design is used to solve the eddy current loss problem of permanent magnets and reduction of cogging torque in electric motors through the utilization of Halbach arrays.Furthermore,mixed magnetic permanent magnet design is adopted to reduce the usage of rare earth permanent magnets and lower the design cost while achieving the required performance.Finally,based on the basic principles of heat transfer,a temperature field simulation model for Permanent magnet-assisted synchronous reluctance motors is established to analyze the heat source distribution and losses during motor operation,and to conduct temperature analysis for the initial start-up and continuous operation of the motor,in order to verify whether the motor will experience excessive temperature rise during operation,leading to demagnetization of the permanent magnets and affecting the motor performance.By improving the particle swarm optimization algorithm,a multi-objective optimization model for the structural parameters of Permanent magnet-assisted synchronous reluctance motors is established to further improve the motor performance on the basis of the original design.