Control Strategy for A Hybrid Excited Axial Field Flux-Switching Permanent Magnet Machine

Hybrid permanent magnet axial field flux-switching memory machine(HPM-AFFSMM)with series HPM magnetic circuit,combining the advantages of axial field flux-switching permanent magnet machine(AFFSPMM),such as short axial length,high torque and power density,with the merits of memory machine(MM),such as wide magnetization state(MS)regulation range,is a novel stator-PM type MM.Consequently,it is promising candidate for wide speed range applications including the electrical vehicles,renewable energy generation.Based on a 3-phase 12/10-pole HPM-AFFSMM,by employing its MS regulation characteristic,together with the vector control,flux-weakening control theory,the dissertation mainly focuses on the current control strategies of the HPM-AFFSMM under different MSs.The main research and innovation are as follows:(1)The machine configuration,operating principle and the MS regulation characteristic of the HPM-AFFSMM are analyzed.Furthermore,the mathematical models of the machine in the stationary frame and the two-phase rotating frame are derived,respectively.The inductance characteristics of the HPM-AFFSMM under the different MSs and armature current are given.Afterwards,based on the MATLAB/Simulink,the HPM-AFFSMM simulation model is built.These analyses and discussions lay the theoretical foundation for investigating the current control schemes of the HPM-AFFSMM.(2)The piecewise MS regulation principle of the HPM-AFFSMM is analysed in details.Based on the adaptive PM flux linkage observer,together with the piecewise MS regulation,several control strategies including the i_d=0 control,maximum optimized torque output control and flux-weakening control are proposed.The results show that the proposed control strategies extend the speed range and improve the torque output capability of the HPM-AFFSMM.(3)The piecewise MS regulation principle without the PM flux linkage observer of the HPM-AFFSMM and its pulse current reference are analyzed thoroughly.In the case of removing the PM flux linkage observer,several control strategies including the i_d=0 control and flux-weakening control are presented.Compared with the control strategies based on the adaptive PM flux linkage observer,the control strategies without PM flux linkage observer possesses the merits of simple calculation,strong robustness and easy realization.