Research On Halbach Permanent Magnet Synchronous Motor With Few Rare Earth Combined Magnetic Pole

Permanent magnet motors offer several advantages,including high efficiency,compact size,high power density,flexible structure,and excellent reliability.In recent years,they have gained widespread usage and attention across various applications.However,the rising demand for rare-earth permanent magnet materials,coupled with their continuous exploitation,has led to a significant increase in their prices.Consequently,the production cost of traditional rare-earth permanent magnet synchronous motors has also risen,posing challenges to the motor industry.To address this issue,there has been a growing interest in the research and development of less-rareearth permanent magnet synchronous motors,which has emerged as a prominent topic in the field of permanent magnet synchronous motor technology.In this paper,a Less-Rare-Earth Halbach Hybrid Permanent Magnet Synchronous Motor(LREH-PMSM)is proposed.The rotor magnets of the LREH-PMSM are excited by a combination of ferrite permanent magnet material and Nd Fe B permanent magnet material.During rated load operation,the LREH-PMSM motor not only ensures comparable electromagnetic torque performance to traditional rare-earth Halbach permanent magnet synchronous motors but also effectively suppresses cogging torque and torque pulsation,thus reducing motor losses.Furthermore,the LREH-PMSM motor reduces reliance on rare-earth permanent magnet materials,which is critical.The paper initially determines the basic initial model of the motor by designing the stator and rotor of the LREH-PMSM motor.In order to optimize the torque characteristics of the motor,the finite element method is used in this paper to analyze and optimize various aspects such as permanent magnet magnet charging angle,air gap length,and permanent magnet material.The electromagnetic torque,cogging torque,and load torque pulsation are considered as the target variables for optimization.To objectively verify the performance of the optimized LREH-PMSM motor,simulations were conducted on four types of permanent magnet synchronous motors using the finite element analysis method in this study.By comparing the magnetic field distribution,no-load characteristics,load torque performance,and losses,the correctness and feasibility of the design and optimization methods for the optimized LREH-PMSM motor were demonstrated.The research findings support the conclusion that the optimized LREH-PMSM motor design and optimization approach are correct and feasible.Finally,an analysis of the production cost of the LREH-PMSM motor was conducted.The prices of the main materials that affect the motor’s cost were provided.By analyzing the impact of the motor’s main dimensional parameters on the material cost and conducting a cost analysis of the four motor models,support was provided for the rationality of the LREH-PMSM motor.