High Response Torque Control of IPMSM Based on a New Coordinate System Suitable for Voltage Amplitude and Phase Control

Abstract

This paper proposes a torque control method for interior permanent magnetic synchronous motors (IPMSMs). The proposed method controls the voltage amplitude and phase based on a new n-t coordinate system. The t-axis is a tangent line of a constant voltage ellipse, and the n-axis is a normal line of the ellipse. On the n-t coordinate system, the n-axis current is not affected by the voltage phase. The n-axis current is utilized to reduce the mutual coupling between the voltage amplitude controller and phase controller. The proposed method realizes a high torque response for the linear range and over-modulation range of the inverter, including six-step mode. The effectiveness of the proposed method was verified by simulation and experimental results.