| 摘要 |
PURPOSE:To obtain an actual value having an amplitude coincident to the primary current command value even when the gain of a regulator drops by using the value produced by adding a compensating value to a command value as an amplitude command value of a current regulator. CONSTITUTION:In a gain compensator 4, a current amplitude detector 41 obtains its actual amplitude value ¦i1¦ from the actual current values ia, ib, ic a current regulator 42 compares the actual current amplitude value ¦i1¦ with its command value i1*, calculates to regulate, and outputs the calculated result as compensat ed value DELTAi*. This value DELTAi* is added by an adder 43 to the command value i1*. Thus, the amount of ic1*=i1*+DELTAi1* becomes the command value of the regulator 2. Accordingly, frequency increases, and when the gain of the regulator 2 drops, the value ic1* increases. Accordingly, the amplitude of the primary current i1 can become constant. |
