Substantial efforts are currently underway around the world to develop environmentally friendly transportation,of which the development of electric vehicles plays a key role.Statorpermanent magnet(PM)machines have attracted wide attention due to the robust rotor structure and comparable performance in terms of normal permanent magnet synchronous machines(PMSM)having magnets in the roto.In particular,the flux-switching machines feature a particular magnetic circuit configuration that favors Dy-free magnets in terms of demagnetization risk,and as a result,the cost of the motor can be reduced considerably.With focus on applications in electric vehicles(EVs)and hybrid electric vehicles(HEVs),this paper reviews the latest developments of PM flux switching machines,with particular emphasis on the novel machine topologies and control strategies.
该文以中压大功率交流电机驱动器为背景。针对多相电机驱动,提出一种基于矢量空间解耦（vector space decomposition,VSD）的中点箝位型多相三电平逆变器空间矢量调制策略。以五相三电平逆变器为例,利用VSD将变量解耦和映射到？-？基波平面和x-y谐波平面。将逆变器243个电压矢量进行精简和合成,得到基波平面和谐波平面解耦的两组电压矢量,分别用来合成基波分量和谐波分量。利用冗余矢量进行直流侧中点电压的控制。通过计算输出电压向量的作用时间,将各相输出电压状态进行合并以减小开关频率。最后通过实验验证提出的策略的正确性。
