Design And Research Of Double-Sided Modular Linear Permanent-magnet Vernier Motor

Linear Permanent Magnet Vernier Motor(LPMVM)is a new type of linear motion mechanism in which the mover is placed above the stator and the large stroke linear motion is realized.LPMVM has the characteristics of simple structure,stable and efficient and light motion,it has been widely studied and applied in the fields of rail transit,cordless elevator,tidal power generation and CNC machine tools.Taking LPMVM as the research object,a bilateral modular structure of LPMVM is proposed,the equivalent magnetic network model and finite element simulation model of the motor are established,and the experimental platform is constructed to study the magnetic leakage coefficient,electromagnetic characteristics,heating condition and phase failure operation of the motor.The main research work is as follows:Firstly,the current application field of linear motors are expounded,and the research status of linear permanent magnet motors and linear permanent magnet vernier motors at home and abroad are introduced,By studying the operating mechanism and advantages and disadvantages of various linear motors,comparing the development prospects of each linear motor,the research value and significance of LPMVM is expounded.Secondly,the motor is bilateralized for the thrust fluctuation and influence brought by the unilateral LPMVM normal force.To improve the fault tolerance performance of the motor,the bilateral LPMVM is modularized,and the magnetic decoupling between the motor modules is realized from the motor structure.At the same time,in order to analyze the magnetic leakage flux of the bilateral modular LPMVM,the equivalent magnetic model of the motor is established,and the mathematical formula of the magnetic leakage flux coefficient is calculated,Finally,the correctness of the theory is verified by finite element simulation.Thirdly,a new combination of permanent magnets is proposed to further improve the electromagnetic performance of the motor.The parameter design principles of LPMVM are summarized,the main parameters of the motor are optimized and the electromagnetic performance of the motor before and after optimization is compared.The experimental platform of bilateral modular LPMVM is established to compare and analyze the experimental and theoretical results,and verify the correctness of the simulation results.Finally,the various internal losses of the bilateral modular LPMVM are calculated,and the finite element temperature field calculation of the motor is carried out to study the temperature distribution of each part of the motor.At the same time,in order to ensure the safe operation of the motor,the various types of phase loss of the motor are analyzed.The thrust variation and the current compensation strategy of the motor are studied and the fault-tolerant fault test is carried out to verify the fault-tolerant current compensation strategy.In summary,the proposed bilateral modular LPMVM can effectively eliminate the influence of unilateral normal force.The established motor equivalent magnetic circuit network model has credibility and accuracy,and the fault-tolerant current compensation strategy studied can effectively give the operation plan when the motor is faulty,which has certain theoretical significance and practical value for further developing the linear operation device with reliable large stroke.