A novel current injection-based online estimation method for surface-mounted permanent magnet synchronous machine

摘要

This paper proposes a novel current injection-based multiparameter estimation method for surface-mounted permanent magnet synchronous machine (SPMSM). Under constant load torque, a short pulse of id>0 is transiently injected into the d-axis current and the variations of dq-axis inductances and rotor flux linkage have been taken into consideration. Secondly, the stator voltage equations will be transformed to eliminate the distorted voltage that caused by voltage-source inverter (VSI) nonlinearity. Finally, in view of the volatilities of parameters, another method that can reduce the fluctuation rate of estimation results is proposed. And the effectiveness of these methods is verified through experiments on a small-power SPMSM.