Electromagnetic Design And Startup Performance Optimization Of Single-Phase Flux Switching Motor

The flux switching motor(FSM)is a new type of permanent magnet motor.Both the stator and the rotor adopt a salient pole structure.The permanent magnets and the windings are alternately arranged on the stator.The permanent magnets are radially magnetized,and the adjacent permanent magnetized in opposite directions.The winding is generally a concentrated winding method,and the rotor is only laminated by a silicon steel sheet.As the rotor rotates,the flux linkage of the armature winding hinge changes bipolar.The flux switching motor has the characteristics of simple structure,easy processing,flexible control,high torque density,and is suitable for running in high speed applications.The single-phase flux switching motor has the advantages of low winding frequency and no danger of straight-through control circuit.This paper first introduces the research background and significance of flux switching motor,and introduces the emergence,development and research status of flux switching motor in combination with related literatures at home and abroad.Then the operation principle of single-phase flux switching motor is introduced,and the reasons of single-phase flux and motor flux switching motor are analyzed.Then,by comparing the structure of the single-phase flux switching motor with the three-phase flux switching motor,the reason why the cogging torque amplitude is large and the back electromotive force distortion rate is high is explained.Then the equivalent magnetic circuit model of the single-phase flux switching motor is established,and the calculation method of the model is introduced.Then combined with the single-phase flux switching motor structural characteristics and the traditional motor design method,the initial size determination formula of the prototype was deduced,and a prototype was designed.The static characteristics of the motor,such as cogging torque and back electromotive force,are then simulated by finite element analysis.Next,optimize the cogging torque and local saturation of the prototype.The cogging torque of the motor and the start dead zone are then optimized.The slot offset method which weakens the amplitude of the reverse cogging torque is used to reduce the starting dead zone of the motor,and the gradient air gap which increases the forward cogging torque is used to reduce the output torque change rate.At the same time,it is analyzed that if the cogging torque of the single-phase flux switching motor is to be weakened,what conditions are needed for the method adopted,and the finite element simulation is performed by using the common size tooth matching and adding auxiliary slots to verify the rationality of the conclusion.Finally,the Taguchi method is introduced to minimize the start dead zone as the primary optimization goal.The output torque is stable above 1.5N · m,which is the secondary optimization target.With the output torque as the constraint,some parameters of the rotor are used as optimization factor.An orthogonal experiment was designed.According to the analysis and comparison of the experimental results,the optimal parameter combination is determined,and the optimization of multiple independent variables and dependent variables of the motor is successfully realized.