Design Of Double Rotor Flux Switching Motor And Optimization Of Cogging Torque

Double rotor flux switching motor not only has the characteristics of permanent magnet motor with high power density,simple structure,but also has the characteristics of output torque of switched reluctance motor,high reliability and good speed performance,which has in hybrid cars,wind power and other fields widely used.Moreover,it has two independent mechanical systems,which can realize the mechanical energy transfer between the two systems independently.Therefore,the dual rotor flux switching motor has better performance in these two fields.This paper introduces the research background,research significance and research status of flux switching motor at home and abroad.Then,the basic structure and operation principle of the double rotor flux switching motor are described in detail,and compared with other typical variable reluctance motor structures.A novel double rotor flux switching motor with better output torque performance is proposed in this paper.Then,the equivalent magnetic circuit model and the simplified equivalent magnetic circuit model of the motor are established according to the magnetic circuit of the double rotor flux switching motor,and the formulas for calculating the main flux and the main flux density of the motor are derived.The magnetic circuit model was established,according to the technical parameters of motor of a prototype is designed,the derivation process of the relationship between the rated torque and main dimensions and the design process of main dimensions of the motor are given,and the performance of dual rotor flux switching motor is verified by finite element simulation.Then,the Taguchi method is introduced to optimize the design of double rotor flux switching motor which is presented in this paper,taking the minimum harmonic distortion of the no-load back-EMF waveform and the maximum amplitude of the fundamental value of the no-load counter electromotive force as the optimization objective,taking the magnetization thickness of the permanent magnet,the eccentricity of the internal and external rotor,and the width of the inner and outer rotor teeth as the test factors,finally,a reasonable orthogonal test is designed.Through the comparison and analysis of the test results,the optimal parameters combination is determined,and the multi-objective and multi parameter optimization design is realized.Finally,this paper also studies the problem of the excessive cogging torque of the motor,and puts forward the optimization method of the stator tooth and the optimization method of changing the width ratio of the stator to the rotor,then selecting the output torque,back EMF and cogging torque amplitude as contrast target,the optimization results of the two methods are compared with the optimization results of the most widely used skewed slots,which further verifies the effectiveness of the two methods for weakening cogging torque.