A Sensorless V/f Control Technique based on MTPA Operation for PMSMs

In this paper, sensorless V/f control technique based on MTPA (Maximum Torque Per Ampere) operation for PMSMs is proposed. Since the MTPA operation is not accounted for in the conventional sensorless V/f control, efficient PMSM drives cannot be achieved. Therefore, this paper proposes an improved technique based on the d-axis current control, enabling the MTPA operation in the V/f control for PMSMs. Moreover, the stabilization technique is added to this V/f control technique for enhanced dynamic characteristics and stability against load variation. The effectiveness of the proposed technique was verified through experiments with a 250W PMSM for a vehicle blower.