Method to Calculate Reference Currents to Achieve Fast Torque Response of IPMSM

Abstract

In this paper, a new method to calculate reference currents is proposed; this method can be used to achieve fast torque response of interior permanent magnet synchronous motors (IPMSMs). In the conventional method used to calculate the reference currents of IPMSMs, only the steady state condition is considered; the optimal reference currents under the transient condition are not taken into account. By using our proposed method, the torque response of an IPMSM can be enhanced and can be made twice as fast as the response achieved by using the conventional maximum torque per ampere (MTPA) method. Moreover, a method to ensure smooth transition from the transient condition to the steady state condition is also proposed in this paper. The effectiveness of the proposed methods is confirmed by many experimental results.