PM Motor Drive System with Low Resolution Position Sensor

Abstract

The high performance drives of PM motor with a sinusoidal back-EMF can be achieved by the current vector control, where the armature current is controlled as a sinusoidal waveform based on the rotor position information and the current phase is suitably controlled according to the operating condition. In such high performance drive system, a high resolution position information is desired. In this paper, a sinusoidal current drive system with a low resolution position sensor is proposed. The high resolution position information is obtained by the position estimating circuit from the signal of a low resolution positionn sensor. The steady-state and transient characteristics are examined by the several experiments, then it is confirmed that the sinusoidal current drive, the high performance current vector control and the speed control can be achieved by the proposed drive system.