| 摘要 |
PURPOSE:To reduce the torque ripple of a drive generator by correcting the phase of a pulse-width-modulated pulse signal by a feedback signal from an output side. CONSTITUTION:Inverters 7, 8 are driven by a pulse-width-modulated pulse signal PWM. A current command I* is input to an adder 1 by this drive, and subtracted by a feedback signal If. This is compared by a comparator 3 through an amplifier 2 with a triangular carrier signal CRY to obtain a pulse signal PWM. This signl is delayed at the rise for a time TG through ON ready circuits 5, 6 and applied to the bases of transistors 7, 8 to drive them. In this case, a correcting circuit 10 is provided to compare the output current detection signal with the pulse-width-modulated pulse signal PWM, to correct the timing of the rise of the next pulse signal PWM by the difference of the falls between the both and to input the signal to the circuits 5, 6. |
