AN APPROACH TO REAL-TIME POSITION ESTIMATION AT ZERO AND LOW-SPEED FOR A PM MOTOR BASED ON SALIENCY

This paper presents a magnetic saliency-based position estimation appr oach for a permanent magnet (PM) motor fed by a voltage-source pulsewi dth modulation (PWM) inverter, The proposed real-time estimation algor ithm detects motor current harmonics and calculates the inductance mat rix, including rotor position information, Position estimation can be performed every period of PWM or carrier cycle, An experimental system using an interior permanent magnet (IPM) synchronous motor has been c onstructed, Experimental results verify that position estimation withi n 10 degrees in electrical angle is obtained at standstill and at spee ds as low as 1 r/min by the proposed approach.