| 摘要 |
A three-phase induction motor control apparatus resorting to a slip frequency control type vector control system having three-phase sine wave generating device, first operation device, second operation device, and vector operation device; whereby a current command value and a frequency command value are determined in accordance with a difference between a set velocity and a real velocity to determined a control current value. The three-phase sine wave generating device generates a three-phase sine wave having a frequency according to the frequency command value. The first operation device multiplies one of outputs, which are outputted from the three-phase sine wave generating device and mutually have a phase difference of 120 DEG , and a preset value to determine one current component value. The second operation device adds one half of the preset value to the current command value and multiplies this resultant value and the other of the outputs generated from the three-phase sine wave generating device to determine the other current component value. The vector operation device determines the vector sum of those one and other current component values to output it as the control current value.
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