Cogging torque reduction in flux-switching permanent magnet machines by rotor pole shaping

Cogging torque in flux-switching permanent magnet machines (FSPMs) is relatively high compared with other types of PM machines because of their unique doubly salient structure. Reducing the cogging torque in the FSPM machine is of particular importance to make it a viable alternative to conventional rotor-PM machines. A new pole shaping method has been proposed to reduce the cogging torque. The validity of the proposed method has been confirmed by analytical methods and finite element analysis based simulation. The influence of the proposed pole shaping method on the back-EMF and average electromagnetic torque have also been investigated.