Electronic braking circuit for rotating AC electrical motors

Details Electronic braking circuit for rotating AC electrical motors Electronic braking circuit for rotating AC electrical motors

1988-10-14

1990-06-26

Shoop, Jr., William M.

Electricity: motive power systems

Braking

318363, H02P 320

Patent

active

049375091

ABSTRACT:
An electronic braking circuit, for use with normal motor energizing circuits, to achieve rapid and controlled stopping of rotating AC motors after removing the driving power. The braking circuit comprises a transformer having a relatively high voltage-low current AC output, e.g. 120v fused at 15A, which is rectified by a full wave bridge rectifier. A phase-controlled triac is provided for selectively applying the unipolar output of the rectifier to the windings of the motor, causing a unidirectional current flow through the windings which charges the inductance of the windings and generates a braking torque. One or more diodes are provided for discharging the inductance of the motor windings during the non-conducting periods of the triac, thereby continuing the unidirectional current flow through the windings. Phase control circuitry is provided for determining the conducting and non-conducting periods of the triac.

REFERENCES:
patent: 2973467 (1961-02-01), Choudhury et al.
patent: 3054037 (1962-09-01), Gaddis et al.
patent: 3439249 (1969-04-01), Brendemuehl
patent: 3800202 (1974-03-01), Oswald
patent: 3872363 (1975-03-01), Gross
patent: 3903464 (1975-09-01), Lyon et al.
patent: 3965404 (1976-06-01), Peterson
patent: 4132934 (1979-01-01), Morton et al.
patent: 4133413 (1979-01-01), Watanabe
patent: 4792734 (1988-12-01), Watanabe

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