Fast Steady-State Analysis Method for Cage Induction Motors Based on Polyphase TP-EEC Method in a Rotational Reference Frame

This paper proposes a fast steady-state analysis method for cage induction motors (IMs) based on the time- periodic explicit-error-correction (TP-EEC) method. To address the high computational costs associated with time- stepping steady-state analysis of cage IMs, we expand the application scope of the dq-TP-EEC method, which was originally developed for three-phase electric machines in a rotational reference frame, to polyphase machines by taking account of slip frequency in the rotor. The effectiveness of the proposed method is demonstrated through the steady-state analysis of two types of cage IMs with closed and semi-closed rotor slots. Numerical results confirm the validity of the method and show that smaller time intervals significantly improve convergence in transient analysis when the slip is not very small. In addition, the limitations of the proposed method due to the large time constant with low slip frequency are investigated.