Robust decoupling current control to magnetic saturation for SynRM using flux observer

Abstract

This paper proposes a robust decoupling current control system to magnetic saturation phenomenon using an extended flux observer for synchronous reluctance motors (Syn-RMs). SynRMs possess considerable magnetic non-linearity, which gives rise to the difficulty in highly accurate decoupling current control. Hence, to realize robust decoupling current control system to magnetic saturation phenomenon, inductance profiles need to be found at various current points for driving SynRMs. This method, however, requires to prepare highly accurate look-up-table of inductances in advance. This paper proposes robust decoupling current control system to magnetic saturation phenomenon without the table of inductances. The proposed method employs the extended flux observer for the realization of robust decoupling control. In addition, the extended flux observer suitable for proposed method is discussed by analyses of bode diagram. Finally, experimental results show the feasibility of the proposed method in this paper.