Sensorless Control of IPMSM: Past, Present, and Future

抄録

This paper presents the history of techniques used for sensorless control of the Interior Permanent Magnet Synchronous Machine (IPMSM) over the last 20 years. The techniques used in the first stage were based on the equivalent circuit of the IPMSM. They extracted rotor position information from the back EMF estimated through simple arithmetic. In the last 10 years, model reference adaptive control or observer-based control techniques have evolved and they have been used for the sensorless control of the IPMSM; however, the rotor position continues to be obtained from the back EMF. Simultaneously, sensorless control based on the magnetic saliency of the IPMSM has been achieved and commercialized. In this paper, an evaluation of the major techniques used for the sensorless control of the IPMSM has been presented, and their limitations have been clarified. Finally, the direction of future development of sensorless control is indicated.