| 摘要 |
PROBLEM TO BE SOLVED: To estimate the pole phase at a high speed without using an FFT while reducing estimation phase error due to noise in the control of a PM motor. SOLUTION: An integrator 21 and a high frequency voltage generating section 22 obtain a sinusoidal single oscillation high frequency voltage from a high frequency angular speed command and the high frequency voltage is injected to the voltage command of dc-axis. High frequency extracting sections 23 and 24 extract the high frequency current component contained in the dc-axis and qc-axis currents. A positive phase map operating section 25 and a negative phase map operating section 26 obtain the maps for the positive phase axis and the negative phase axis of the high frequency current component thus extracted. A positive/negative phase asymmetry extracting section 27 obtains the asymmetry of two maps as a feature amount. A phase estimating section 28 determines an estimated phase θc from the feature amount. |
