| 摘要 |
PURPOSE:To prevent excessive inverter current from flowing by lowering the gains of multipliers at the same time and controlling each-phase current command value within the specified level when the peak hold value gets over the output value of a limiter part. CONSTITUTION:A peak holder 19 holds the peak of the excessive absolute value signal in high-speed response, and a gain setter 20 divides a limiter output value by a peak hold value. Thereupon, since the limiter output value is smaller than the peak hold value, the result of division becomes 1 or less, and the gain of each multiplier 15 becomes one or less in high-speed response. Input signals 1Lh are amplified as they are the same sine waves as the input signals ILh with the same gains not more than 1 and besides without cutting the peaks. Hereby, the input signals 1Lh. are controlled within the output level of the limiter, and are outputted as current command values Icr, Ics, and Ict, and surplus fundamental wave ingredients, etc., are not outputted. |
