Speed sensorless vector control of an induction machine in low speed range

Aim In the high speed range,to make the vector control of rotor flux orientation of an induction machine in good performance.Methods The performance in low speed range becomes poor because of the inaccurate estimating of rotor flux and speed.Modified voltage model for rotor flux estimating and neuron model for speed estimating are used to improve the performance of speed sensorless vector control.Results The experimental results show that the proposed scheme yields improved performance in low speed range.Conclusion 2.5Hz can perform in good state.