Voltage integral model for stator flux estimator based on band-pass filter

For the problem that the estimation of magnetic flux of stator has direct current (DC) offset because the low pass filters(LPF) of voltage integral model was affected by the zero drift of voltage and current, the integral initial value and stator resistance error, band pass filters(BPF) of voltage integral model was proposed, which eliminated the DC offset. Aiming at the basic voltage integral model of stator flux estimator, error analysis was studied, and then BPF of voltage integral model was built. Whereafter the theory why BPF of stator flux estimator eliminated DC offset was researched, and error compensation of amplitude and phase were given. Simulation and experiment results for BPF of stator flux estimator demonstrate that BPF of stator flux estimator solved the problem of DC offset in LPF, eliminating DC offset, and after error compensation of amplitude and phase are made, the waveforms of estimated magnetic flux and referenced magnetic flux coincide.