Design And Optimization Of Double-sided Permanent Magnet Linear Synchronous Motor

Since the linear motor does not require an intermediate mechanical transmission device and is superior to the rotary motor in terms of control accuracy,thrust,speed and acceleration,it is used as the main driving source of the transportation system.With the emergence of the rare earth permanent magnet material neodymium iron boron,in some linear motion occasions,other motors cannot achieve the required high speed and high precision,making it incomparable with the excellent performance of permanent magnet linear motors.Therefore,permanent magnet linear motors have been widely used in the fields of factory automation and numerical control systems.However,there are some problems that need to be solved urgently.When permanent magnet linear synchronous motors are used in precision positioning applications,the cogging force will oscillate the fuselage during operation,which will cause equipment deformation and reduce the working life of the electronic components of the motor drive.As a result,the linear motor feed system cannot give full play to its excellent performance.Therefore,this article combines finite element and experimental verification to study the problems encountered in order to achieve the purpose of optimizing the structure of the motor and improving the performance of the motor.Firstly,the advantages of linear motor drive compared with the traditional feed drive mode and the various stages of development are explained.The performance of the linear motor produced by major domestic and foreign manufacturers is briefly introduced,and the domestic and foreign scholars’ efforts to optimize the linear motor are summarized.The structure proposed for various performances or the research results of the optimization algorithm.Secondly,the Taguchi and NSGA-Ⅱ are combined to realize the multi-objective optimization of the motor.The sensitivity analysis of the selected parameters is carried out by Taguchi method,and the parameters with smaller weights are eliminated.Then,the NSGA-Ⅱ is used to determine the average thrust,thrust fluctuation and efficiency of the motor.The performance of these goals is optimized for multiple goals.The fast non-dominated sorting algorithm proposed by NSGA-Ⅱcan select the best individual from double the space,and the introduction of the elite strategy ensures the optimization accuracy.The entire algorithm process Compared with the traditional genetic algorithm,the optimal solution can be obtained more quickly and accurately.Afterwards,a double-sided permanent magnet linear synchronous motor was developed based on the optimized motor parameters,which was used for experimental measurement and verification of the optimized scheme.Finally,an optimization plan is proposed for the cogging force of the linear motor,considering adding additional slots on the teeth and staggering the double-sided primary by one displacement,and adjusting the winding sequence to make the upper and lower in-phase windings have the same electrical angle,and then verify it through finite element simulation.The results show this method can greatly weaken the cogging force and reduce the thrust fluctuation.The paper has 39 pictures,3 tables,and 85 references.