Design And Analysis Of Novel Reduced Rare Earth Partitioned Stator Double-side Hybrid Excitation Flux-switching Machine

The rare earth permanent magnet motor has been developed rapidly and widely used in the field of industrial drive and electric vehicle for its simple structure,high power density and high efficiency.However,with the unstable supply of rare earth permanent magnet materials and rising prices,the rare earth permanent magnet motor is difficult to reduce the cost.Therefore,less rare earth permanent magnet motor with low cost has become one of the research hotspots in the related field of motor drive.In this paper,a new type of rare earth stator-partition hybrid excitation flux-switching motor is proposed,which is based on the theory of hybrid excitation motor and rare earth permanent magnet motor.On the one hand,the motor through the use of rare earth permanent magnet and rare-earth permanent magnetic materials,greatly reduce the amount of rare earth permanent magnet materials,but can still maintain high output torque and power;on the other hand,the motor magnetic field can be adjusted flexibly by adjusting the magnitude and direction of the excitation current because of the DC excitation winding placed inside and outside the stator.The research shows that the motor not only maintains the advantages of flux switching permanent magnet motor with high efficiency,high power density,but also has the advantages of flexible adjustable air gap magnetic field and adequate use of internal space.The research work of this paper mainly includes the following aspects:Firstly,the research status of reduced rare earth motor,hybrid excitation flux switching motor and stator-partitioned motor at home and abroad are summarized.In view of the disadvantages of the existing motor,a new type of reduced rare earth double side hybrid excitation type stator flux switching motor is proposed.After that,the operation principle of the motor and the magnetic regulation mechanism of the internal and external excitation are analyzed and summarized.Secondly,referring to the traditional theory of flux switching motor design,thegeneral design method of this motor is given,and the design parameters of the basic motor such as the ratio of pole and slot and the width of stator and rotor are determined.Based on the equivalent magnetic circuit model of the motor,the design and matching principle of two kinds of permanent magnet with different properties are deduced theoretically.In the limit of magnetic ratio,the excitation winding and the armature winding of slot parameters is determined.Then,the paper analyzes the influence of stator magnetic bridge,stator tooth width on the magnetic regulation of the motor.With the sensitivity of the multi-objective optimization design method,the effect of output torque and torque ripple of some key structural parameters is analyzed.Thirdly,based on the finite element simulation,the no-load characteristics and load torque characteristics of the motor are analyzed.The anti-demagnetization ability of ferrite and NdFeB material is analyzed since the demagnetization of permanent magnet material.Because of the double side electric excitation winding of the motor,the magnetic flux regulation capability of the internal,external and the both excitation windings is analyzed,also include the influence on the electromagnetic performance of the motor.Finally,the processing scheme of the motor is studied.At present,the motor is being processed.The experimental scheme will be developed,and the correctness of the theoretical analysis and the rationality of the prototype design can be verified by the test of the prototype.