| 摘要 |
PURPOSE:To perform the stable operation of an induction machine by detecting the signal relating to the secondary resistance from the output signal of an amplifier which inputs a deviation signal between the set primary voltage and the detected value and correcting the slip frequency by this signal. CONSTITUTION:The output signal of an absolute value circuit 19 becomes a signal which instructs the primary voltage of an induction machine 4. The primary voltage of the machine 4 is detected by a transformer 40 and a voltage detector 21. A deviation between the output signals of the detector 21 and the circuit 19 is obtained by a subtractor 22, the output of the which is applied to an adder 10 through an analog gate 24 wich is turned ON or OFF by the output signal of a speed discriminator 23, a polarity converter 25 and a voltage control circuit 26. The output signal of the circuit 26 is a correction signal of the slip frequency which relates to the secondary resistance of the machine 4. The output signal of the adder 10 is applied to multipliers 13, 14 through V/F converters 11, 12, the outputs of which are applied to 2-phase/3-phase converter 15. |
