Design And Research Of Partitioned Stator Hybrid Excited Flux-Switching Motor

With the development of economy and society,the demand and quantity of automobiles have become larger,which has greatly aggravated the global oil crisis and environmental pollution.Electric Vechile(EV)is characterized by high efficiency,energy saving,and low noise.It is one of the effective means for human society to achieve sustainable development.As a key component of the EV,its drive motor should have features such as wide speed range,high starting torque,high power density,and high efficiency.The stator permanent magnet motor not only has the advantages of large instantaneous power,high overload capacity and high power density,but also the salient pole core of the motor rotor,which has a simple structure and high robustness.However,the no-load air gap magnetic field of the stator permanent magnet type motor is generated by the permanent magnets,which has the problem that the air gap magnetic field is inconvenient to adjust,thereby limiting the speed range of the motor,so that the application of such motors in the EV field is limited.Although the stator permanent magnet type hybrid excitation motor can expand its speed range by adjusting the excitation current,its permanent magnet material,armature winding and field winding are all placed on the same stator,which not only increases the design difficulty,but also limits the class.Motor power density and magnetic field adjustment capability.In this paper,stator stator design concept is introduced into the stator permanent-magnet hybrid excitation motor,and a Partitioned Stator Hybrid Excitation Flux-switching(PS-HEFS)motor is proposed.The topology and operation of this motor are also provided.Principles,structural parameters design,performance analysis and comparison and experiments were systematically studied.The main content of this article includes:1.A PS-HEFS motor is proposed and its topology is discussed.The air gap flux density is calculated using the equivalence of the equivalent magnetic circuit.Based on this,the principle of motor operation is analyzed and the armature winding of the motor is analyzed.The connection is configured;the finite-element software JAMG is used to calculate and systematically analyze the air-gap magnetic density of the air gap,and the accuracy and rationality of the analytical method are verified.2.Derived the power equation of the PS-HEFS motor.The main parameters of the PS-HEFS motor were simulated and calculated,such as the slot ratio,the size of the permanent magnet,the thickness of the magnetic bridge,the position of the magnetic bridge,and the relative position of the stator and the stator.Finally,the prototype parameters of the PS-HEFS motor were determined.3.Using finite element software JAMG to calculate and analyze the electromagnetic properties such as no-load permanent magnetic field,armature reaction magnetic field,no-load flux linkage,induced potential,cogging torque,inductance,output torque,and magnetizing ability of PS-HEFS motor.4.The PS-HEFS motor loss was analyzed and calculated.Firstly,the magnetic core density of the motor core is analyzed.Based on this,the stator core and rotor core losses of the motor are simulated and calculated;the copper consumption of the motor armature and the excitation copper consumption under different excitation currents are calculated.Finally,the efficiency of PS-HEFS motor is calculated according to each loss.5.The PS-HEFS motor prototype was processed and manufactured.Through experiments,the back-EMF waveforms in different excitation modes were measured.