To prevent generation of over-voltage or over-current so as to make safely processing possible, by deciding abnormality in a decision means in the case that an output of a voltage detection circuit is a prescribed value or more.
A control device 10 for an electric motor 7 is constituted by a DC power source 13 formed by connecting a rectifying smoothing circuit 12 to an AC power source 11, inverter 14 connected to an output of the rectifying smoothing circuit 12, voltage detection circuit 15 detecting output voltage of the rectifying smoothing circuit 12, and a control means 16 inputting an output of the voltage detection circuit 15. In the control means 16, a microcomputer as a decision means is provided, in the case that an output of the voltage detection circuit 15 is a prescribed value or more, abnormality is decided. In this way, the AC power source, in the case of high abnormal voltage, is quickly detected, generation of over-voltage or over-current is prevented in the rectifying smoothing circuit, inverter, etc., as a constitutional element, and safely processing is made possible.
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KIUCHI MITSUSACHI
MATSUMOTO TAKAHIRO
