| 摘要 |
<p>[Object] To suppress a sudden change of noise due to a changeover between modulation methods and to suppress a switching loss while improving a voltage accuracy. [solution] A correction-term adder 1 compares a maximum value max(V * ) with an absolute value of a minimum value min(V * ). The correction-term adder 1 selects a signal 1 - max(V * ) when the maximum value max(V * ) is larger than the absolute value of the minimum value min(V * ), on the other hand, selects a signal -1 - min(V * ) when the absolute value of the minimum value min(V * ) is larger than the maximum value max(V * ). Thereby, a signal of correction amount ± is calculated. Moreover, the correction-term adder 1 produces a triangular-wave-shaped signal k(max(V * ) + min(V * )) by multiplying a gain k by an addition signal max(V * ) + min(V * ) of the maximum value max(V * ) and the minimum value min(V * ). This triangular-wave-shaped signal k(max(V * ) + min(V * )) is synchronized with the correction amount ±. The correction-term adder 1 produces a correction amount ² by selecting smaller one in absolute value between the triangular-wave-shaped signal k(max(V * ) + min(V*)) and the correction amount ±, and adds the correction amount ² to the voltage command values V* U , V* V , V* W .</p> |
