Position sensorless control of synchronous reluctance motor using high frequency current injection

This paper presents a position sensorless control scheme of synchronous rel uctance motor using high frequency current injection. The rotor has inheren t rotor saliency and its angle is estimated from d and q stator current inj ection and the appropriate signal demodulation. This scheme gives robust an d dynamic estimation of the rotor angle independent of the operating condit ions including standstill, light and heavy loading. Experimental results of closed loop speed control of a 3.75kW axially laminated synchronous reluct ance motor are given to verify the proposed scheme.