Maximum torque/minimum flux control of Interior Permanent Magnet Synchronous Motor based on magnetic energy model

This paper presents a field oriented direct torque control system in Interior Permanent Magnet Synchronous Motor (IPMSM) which controls torque to be the maximum and flux to be the minimum simultaneously. In order to control torque directly, a concept of magnetic energy conversion is introduced. A state space model described by magnetic energies which one is stayed in the field and the other is converted to torque are presented. Direct torque control based on the state space model is more robust to disturbance such as load torque change. A PWM inverter-fed IPMSM control system has been driven by field oriented control algorithm without chattering applied on sliding mode control. The validity of the proposed method is confirmed by simulation results.