Design And Analysis Of Novel Hybrid Excitation Flux Reverse Machine

Flux reversal permanent magnet machine(FRM)is a new type motor with permanent magnet located on the stator,the rotor is similar to the switched reluctance motor,only composed of silicon steel sheet.The idea of hybrid excitation is to improve the structure of motor based on the permanent magnet machines.The problem that the air gap magnetic field of the permanent magnet machine is difficult to adjust can be well solved by adding a set of electrical excitation windings.This thesis combines flux reversal machines with the idea of hybrid excitation and puts forward a new structure of three-phase and 6/8-pole hybrid excited flux reversal permanent magnet machine(HEFRM),which can realize the purpose of adjustable output voltage and improve the practical value of the motor.Firstly,this thesis introduces the background,the significance of the research,the evolution history of flux reversal machines,the research status of flux reversal machines and hybrid excited motors.By comparing with several common permanent magnet motors,the characteristics of this new type motor are highlighted.The topological structure of the related motors is enumerated and the model of the motor with new structure is proposedThen the basic internal structure and operation principles of the flux reversal machines are expounded.The magnetic flux reversal process is explained by the ideal path of magnetic line of force in four key positions of single-phase flux reversal machines.The equivalent magnetic circuit model of the motor is given,the magnetic field regulation principle of the hybrid excitation is explained and the linear inductance expression and the mathematical model of the motor are set up.After that the related design of the new structure motor is carried out,including the position of electrical excitation,the arrangement mode,shape of the permanent magnet,the design of windings,the size of the stator and the rotor.According to the theoretical calculation and the empirical formula of motor's ontology design,the dimensions of other detail parts are designed and the parameters of winding resistance,inductance and loss are estimated by the analytical method.Finally,the designed motor is simulated by using ANSYS finite element simulation software,which makes the motor work under no-load and rated load respectively.The motor's flux linkage distribution and the flux density distribution,three-phase flux linkage,induced voltage,the air gap flux density,the torque and the inductance waveform are collected.Also,the effect of different sizes of excited current on the motor's induced voltage is verified.With the help of software analysis,the design of the motor is optimized.By exploring the influence of rotor pole arc size,rotor pole shoe,rotor tooth shapes on the changes of magnetic flux,some optimization means such as the use of rotor chutes and big or small tooth can be adopted to reduce the cogging torque and torque ripple.Through the manufacture of prototype for experimental verification,with different sizes of excited current,that the output voltage can be adjusted is verified.By comparing the measured data with the simulation results,the correctness of the simulation results is verified,the feasibility of the hybrid excitation scheme and the rationality of its structure are proved.There are 81 figures,11 tables and 92 references in this dissertation.