Optimal Design Of Double Linear Flux Switching Permanent Magnet Motor

The application of flux-switching permanent magnet linear motors has received more and more attention in various fields because of its high work efficiency,high power density,simple structure,and low manufacturing and maintenance costs.however,the motor has problems such as high detent force,high output thrust pulsation,mechanical vibration,etc.,which greatly affect the smoothness of the motor operation due to its unique double salient pole structure and magnetic focusing effect.Therefore,it has obvious engineering application value for designing a high-performance,high-efficiency linear flux switching permanent magnet motor to reduce the amplitude of the positioning force and its thrust fluctuation.Firstly,this paper introduces the basic mechanism of the double linear flux-switched permanent magnet(DLFSPM)motor,analyzes the power generation and electric operation principle of the motor,and determine the initial size parameters of the motor according to the relationship between the power equation and the main size of the double-sided flux switching motor,a two-dimensional finite element model was established,the static electromagnetic characteristics of the motor were simulated and verified,and the leakage field distribution of the motor with the initial structure was analyzed.Then,according to the magnetic field distribution and main magnetic flux path of the motor,the equivalent magnetic circuit model of the DLFSPM motor was established,and the influence of each structural parameter of the motor in the initial design scheme on the electromagnetic characteristics of the motor was analyzed.Magnetic flux leakage of the end reduces the positioning force of the linear motor and improves the thrust performance of the motor.The Bezier curve is used to fit the flow curve of the magnetic line of induction to the primary iron core,the structure of the end of the primary iron core is optimized,and the response surface method is used to structure the secondary cogging Optimized and added the magnetic bridge structure,with the positioning force amplitude,the smallest thrust fluctuation,and the largest average electromagnetic thrust as the optimization and comparison objectives,which verified the effectiveness of the proposed optimization method.Finally,on the basis of iron core optimization,aiming at the problem of excessive positioning force of DLFSPM motor,this paper combines the magnetic co-energy method to derive the analytical expressions of detent force and electromagnetic thrust,and it is proposed that a three-stage permanent magnet model with unequal thickness.The response surface method(RSM)is used to optimize the structural parameters of the permanent magnet model in multiple variables,and the size parameters that make the permanent magnet work at the maximum effective magnetic energy are obtained,and the detent force amplitude,back EMF harmonics and average electromagnetic thrust are selected as comparison targets,Compare the electromagnetic performance of the final comprehensively optimized DLFSPM motor with the performance of the initial structure motor to verify the effectiveness of the optimization method.