| 摘要 |
PROBLEM TO BE SOLVED: To prevent step-out and stably drive by performing commutation always at the optimum timing, by determining a quantity of delay in an electrical angle required for delaying a commutation pulse up to an optimum commutation point depending upon the peak value in a detected current. SOLUTION: In order to cancel a lead phase deviations generated in rotor position signals X, Y, Z due to a distortion occurring in a terminal voltage integration waveform of a motor 1, a current flowing to a stator winding accompanied with the rotation of a rotor or a current flowing out from the stator winding is detected as a current value equivalent to the detected value. The detected current is converted into digital values by A/D converter 6 and the peak value (peak-to-peak) of a current waveform is retained by a peak hold circuit 7. From the detected current value of the peak of current waveform, the quantity of delay d of electrical angle corresponding to the current waveform is determined from a leading angle adjusting circuit 8, and the quantity of delay d in electrical angle reflecting to the commutation timing is actually determined and output. |
