Hexagon voltage manipulating control (HVMC) for AC motor drives operating in the maximum torque per voltage (MTPV) region

Abstract

This paper proposes a controller design method for ac motors operating under the maximum torque per voltage (MTPV) condition to explore the available inverter voltage. The control algorithm is developed based on a hexagon voltage manipulating control (HVMC) method to select a truncated output voltage command satisfying the maximum torque generation under the voltage deficit region. The proposed method outperforms a conventional current vector control (CVC)-based MTPV strategy in terms of an analytical and intuitive voltage truncation rule without requiring any additional MTPV tracking function and control mode switching action. Furthermore, with the maximum voltage utilization, the drive efficiency is improved over a wide constant power operating range. The proposed algorithm can be applied to permanent magnet (PM) synchronous machines of all kinds as well as induction machines.