| Abstract |
This paper proposes novel V/f control for interior permanent-magnet synchronous motors (IPMSMs) in order to achieve maximum torque per ampere (MTPA) control without motor parameters such as dq-axis inductance and flux linkage of a permanent magnet. The V/f control does not require either information of a rotor position or the motor parameters in order to construct the control system. However, the conventional MTPA control requires the motor parameters because the control determines the compensation voltage depending on the reactive power. On the other hand, with the proposed MTPA control, a hill climbing method is utilized. The proposed MTPA control calculates the compensation voltage depending on the output current in order to track the MTPA control point without the motor parameters. The validity of the proposed method is confirmed by the experimental results using a 3.7-kW IPMSM. From the experimental results, the magnitude of the phase current is decreased by 56\% at the rated speed. Furthermore, the proposed MTPA control is effective regardless of the magnitude of the load torque. |
