This paper introduces a practical startup with a smooth transition to sensorless field-oriented control (FOC) of current source inverter (CSI)-fed Permanent Magnet Synchronous Motor (PMSM) drives that are used in submersible pump applications. The strategy ensures a smooth transition to sensorless control, enhancing the efficiency and reliability of the drive system. The proposed method minimizes speed and current oscillations during the transition stages. Simulation and experimental results validate the strategy's effectiveness, demonstrating minimal oscillations in speed and current.
