Abstract
This paper analyzes some effects on sensorless speed control performance of a sliding mode observer (SMO) for building electric propulsion system of small ships using a permanent magnet synchronous motor (PMSM). An adaptive observer gain and switching function in the SMO are analyzed in detail to reduce the chattering phenomenon in estimated back electromotive force information. Furthermore, cascade low pass filter and PI controller gains are also investigated to progress speed sensorless control performance especially in low speed area. The results of simulations and experiments considering a 1.5 kW PMSM are provided to assure the effectiveness of the optimized SMO and controllers. The results show that the optimized SMO, cascade low pass filter, and controllers can give good speed sensorless control performances even when the PMSM operates at 5rpm.
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