Operation control apparatus for AC motors

Details Operation control apparatus for AC motors Operation control apparatus for AC motors

1980-08-08

1982-10-05

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Braking

318803, 318808, H02P 318

Patent

active

043530230

ABSTRACT:
An apparatus for controlling the operation of an AC motor wherein braking energy at the time of a reduction in motor speed is disposed of by regenerative braking. The apparatus includes a rectifier connected to the AC power source, a smoothing capacitor, a variable-voltage variable-frequency inverter, and a regenerative thyristor bridge circuit connected between the inverter and the rectifier through switching transistors. There is also provided a firing control circuit for controlling the firing of each thyristor in the thyristor bridge circuit and for controlling driving of the switching transistors in synchronism with the firing of the thyristors, the braking energy being fed back to the AC power source when the AC motor undergoes a reduction in speed. The apparatus is small and can be constructed simply and inexpensively.

REFERENCES:
patent: 4019117 (1977-04-01), Gehm et al.
patent: 4139885 (1979-02-01), Overzet et al.
patent: 4281378 (1981-07-01), Ogino et al.

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