Design Of Hybrid Excitation Flux Switching Motor

As environmental pollution and energy crisis issues become increasingly prominent,accelerating the research on new types of high-efficiency and energy-saving motors has become an important strategic measure to achieve sustainable development.As a double salient brushless motor,the flux switching motor has the advantages of high back-EMF sine,high power density and high torque density.It can be widely used in household appliances,electric vehicles,medical machinery,wind power and other fields.In view of the fixed voltage of conventional flux switching motors,it is difficult to adapt to complex working conditions.The paper proposed a new type of hybrid excitation flux switching motor that combined DC excitation windings and permanent magnets.The Magnetic flux of the motor can be adjusted by the method of hybrid excitation.This article introduced the working principle of the flux switching motor,and drew the magnetic circuit model of the basic unit of the motor according to the working principle of the motor.This article also established the mathematical model of the motor,derived the motor model in the dq0 coordinate system,and obtained the corresponding circuit and magnetic circuit equations.Based on the design requirements of the motor,the electromagnetic parameters of the new structure of the motor were calculated,and then the ANSYS finite element simulation software was used to establish the simulation model of the new structure of the hybrid excitation flux switching motor,and the three magnetic bridge structures of the stator yoke were carried out finite element analysis.In view of the large cogging torque of the flux-switching motor,this paper proposes three improved solutions for the rotor,namely rotor slanting,rotor slotting and rotor chamfer.Then,the induced electromotive force of the motor and the rotor chamfer under the three optimization schemes are combined.The cogging torque is analyzed,and overall,the rotor chamfer has the most obvious restraint effect on the cogging torque.Based on structural comparison and analysis,an optimized motor structure was determined.Using the finite element model,the induction electromotive force,air gap density,distribution cloud diagram,cogging torque and three-phase flux chain of the new motor were analyzed in the case of permanent magnet excitation,electric excitation and hybrid excitation.The results show that the new hybrid excitation flux switching motor can effectively broaden the adjustment range of induced electromotive force,which verifies the rationality of the new structure.The paper has 73 figures,10 tables,and 79 references.