A calculation method of reference flux to realize maximum torque per ampere control in direct torque controlled permanent magnet synchronous motor drives

This paper proposes a maximum torque per ampere control method for a direct torque controlled permanent magnet synchronous motor without using a look-up table. The proposed method is based on a motor model in the d-q rotating frame, which is often used in synchronous motor control. This method does not require any look-up tables, and therefore, estimated parameters can be applied easily. In addition, inductance variation can be considered if inductances are modeled as functions of current. The simulation and experimental results validate the proposed method.