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Single shunt phase current reconstruction for Sliding Mode Control algorithm driven PMSM

This paper presents a method to obtain phase currents of the Permanent Magnet Synchronous Motor (PMSM) fed by three phase bridge converter equipped with single shunt resistor measuring the DC-link current in case the motor is driven by the Sliding Mode Control (SMC) algorithm running at high switching frequency. This method was successfully tested and the measured results are included. The main benefit of the presented design is the cost reduction of small to medium power drives utilizing the modern high efficient motor with simple converter not depending on motor parameters due to the Sliding mode control. This method brings accurate results at high frequency switching application used for motors with small phase inductance.