Sensorless vector control for super-high speed PMSM drive

This paper describes the implementation of the vector control schemes for a variable-speed 131kW PMSM (Permanent Magnet Synchronous Motor) in super-high speed application. The vector control with synchronous reference fra­me current regulator has been implemented with the challeng­ing requirements such as the extremely low stator induc-tance(28μH), the high dc link voltage(600V) and the high excita­tion frequency(1.2kHz). Because the conventional position sen­sor is not reliable in super-high speed, a vector control scheme without any position sensor has been proposed. The proposed sensorless algorithm is implemented by processing the output voltage of the PI current regulator, and hence the structure is simple and the estimated speed is robust to the measurement noise. The experimental system has been built and the proposed control has been implemented and evaluated. The test result, up to the speed of 60,000 r/min, shows the validity of the proposed control.