| 摘要 |
PURPOSE:To control the current of an AC motor so that the instructed current value and the actual value always become coincident with a simple configuration by applying the correction current command value of an AC signal of the amplitude produced by adding a current deviation value to the current instruction value to a current controller. CONSTITUTION:A signal which instructs the amplitude of the armature current of a synchronous motor 3 is outputted from a speed controller 11. The correction signal of the deviation of the current is outputted from an error current controller 12. The above two signals are added by an adder 13, the addition signal is then passed through a multiplier 14, thereby outputting a sinusoidal current instruction signal of the added signals. The current can be controlled so that the current instruction value and the actual value are always coincident by applying the current instruction signal to a current controller 17, thereby controlling the torque of a motor to the prescribed value. |
