Driver for induction motor and method of driving the same

Electricity: motive power systems – Induction motor systems – Primary circuit control

Reexamination Certificate

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Details

C318S727000, C318S799000, C318S801000

Reexamination Certificate

active

07545116

ABSTRACT:
An object of the present invention is to provide a driver for an induction motor which performs an operation at an acceleration suitable for the magnitude of a load and is excellent in efficiency, without an acceleration failure. The driver for an induction motor includes a slip frequency estimate value arithmetic operation section15for arithmetically operating a slip frequency ωs^ of an induction motor12,and a maximum torque generation slip arithmetic operation section16for arithmetically operating a slip frequency ωsmax at which a maximum torque is generated. When the slip frequency ωs^ exceeds a predetermined value ωsmaxTH (=0.9 ωsmax, etc.) corresponding to the slip frequency ωsmax at which the maximum torque is generated, a speed change rate arithmetic operation section17and a speed change rate correcting section18reduce a rate of increase in a speed command ωr*. In addition, when the slip frequency approaches the maximum torque generation slip frequency too closely, the load concerned is judged to be overloaded, and an alarm is generated.

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