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This paper describes a speed sensorless permanent magnet synchronous motor (PMSM) direct torque control (DTC) using single DC-link voltage and current sensors. The phase currents are estimated in a two-stage process: prediction and adjustment. Prediction is based on the dynamic motor model, whereas adjustment relies on the inverter switches states and the measured DC-link current. This system is then incorporated into a speed sensorless DTC scheme. The rotor speed is estimated from the instantaneous stator flux linkage position and load angle value.
Date of Conference: 3-6 May 2009