| 摘要 |
PROBLEM TO BE SOLVED: To prevent unstable control and generation of waveform distortion and ripple by applying a sum of the waveform obtained by adding the part reduced by limiting the peak of the 3-phase sine wave to the other two phases and an output of a current control means to a PWM generating means. SOLUTION: A reference bias waveform generating means 64, a bias modulation rate calculator 62 and a multiplier 63 are added to a reference waveform generating means 6 and moreover an adder 11 is also added. The multiplier 63 obtains a product of an output of the reference bias waveform generator 64 and an output of the bias modulation rate calculator 62 to output bias voltage commands Vbr* to Vbt*. The PWM generator 8 is given, by the adder 11, the sum signal Vr* to Vt* of the bias voltage commands Vbr* to Vbt* of each phase as the outputs of the multiplier 63 and the converter voltages Vir* to Vit* of each phase as the output of the current controller 7 and then outputs the PWM signal depending on such output signals. |
