Dead-time Compensation via Adaptive Lookup Table Reconstruction for Low-Speed Operation

The Inverter's dead-time along with the inverter nonlinearities, referred to in this paper as the inverter nonidealities, are known to produce distorted voltage output. This leads to unacceptable performance at medium and low speeds. A new algorithm is proposed based on adapting a feedforward compensation voltage to mitigate the sixth harmonic feedback in the voltage and hence reduce the inverter's non-ideal behaviour even at low speeds. The proposed technique relies on mathematical analysis and linear control design rather than empirical designs. This technique is verified experimentally on a sensorless sliding mode based PMSM drive and compared to other well-known techniques in the literature.