Design And Analysis Of Double-Stator Tubular Fault-Tolerant Flux-Modulation Permanent Magnet Motor For Electromagnetic Suspension

With the standard of living rising,people pay more attention to the performance of the vehicle handling stability,driving safety,and ride comfort.The suspension system is one of the key components to determine vehicle performance.As the core component of suspension system,actuator has gradually become a research hotspot.Tubular permanent magnet(PM)linear motors are suitable for electromagnetic suspension system due to their simple structure,no end windings,low force ripple,and fast response.On the basis of stator PM flux-modulation motor,the stator partitioned double-stator tubular fault-tolerant flux-modulation permanent magnet(DSTFT-FMPM)motor is proposed in this paper.The proposed motor has the advantages of flux-modulation motor,stator PM motor and fault-tolerant motor.The proposed motor has two set of stators with armature winding and PMs located separately which not only solves the problem of heat radiation and magnetic protection of PMs,but also improves space utilization to increase thrust force density.The research contents of this paper are summarized as follows:(1)According to the stator PM flux-modulation motor and stator partition technology,a surface-mounted consequent pole DSTFT-FMPM motor is proposed,and the concept of fault-tolerant motor is adopted in the design.The key parameters of the motor are optimized for maximum thrust force.(2)Two different surface-mounted DSTFT-FMPM motor with N-S and consequent pole PM structure are designed and proposed.The electromagnetic performances,including flux linkage,back-EMF,detent force,thrust force,inductance,and losses of the proposed two surface-mounted DSTFT-FMPM motor and the traditional stator PM flux-modulation motor are analyzed by finite-element software Maxwell.(3)A novel interior DSTFT-FMPM motor with axially magnetized PM structure is designed and proposed to further enhance the thrust force density.The performance of the interior DSTFT-FMPM motor is also compared with that of the consequent pole DSTFT-FMPM motor by finite element method.(4)The mathematical model of the interior DSTFT-FMPM motor is established.Besides,a joint simulation of Maxwell,Simplorer and Matlab/Simulink software on the proposed interior DSTFT-FMPM motor to verify its steady-state and dynamic performance.