Sensorless vector control of PMSM with observer-based phase current reconstruction using only a DC-link current sensor

This paper presents a sensorless vector control algorithm for permanent magnet synchronous machines. This scheme uses a single current sensing resistor in the DC-Link in combination with a linear parameter varying (LPV) observer to reconstruct the phase currents of the motor. These reconstructed phase currents are used as input to a model reference adaptive system in order to estimate the angle and the speed of the motor. The DC-Link current sensor is consequently the only sensor in the whole system which can be used for motor control. The proposed control scheme is implemented on a 32-bit microcontroller. Experimental results of the real-time control of a fuel pump motor are presented.