Safety apparatus for use with a three-phase AC motor

Details Safety apparatus for use with a three-phase AC motor Safety apparatus for use with a three-phase AC motor

1978-01-27

1979-07-31

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Reverse phase responsive

318289, H02H 326

Patent

active

041632702

ABSTRACT:
Safety apparatus for use with a three-phase AC hoist motor adapted to be connected to a three-phase AC power source, motor rotation being correct if the motor is connected to the source in correctly phased relationship but incorrect if connected with an incorrectly phased relationship.
Phase detection circuitry is provided for detecting the phase relationship of said AC power provided by the power source connection and for providing a signal indicative of an incorrect phase relationship. Phase corrector circuitry of the apparatus is operative when enabled for correcting the phase relationship of the AC power provided from said source to the motor. Circuitry is included for functionally interconnecting the phase detector circuitry and the phase corrector circuitry for enabling operation of the latter in response to said signal, thereby ensuring operation of the motor in a correct direction regardless of incorrect phasing provided by the connection to the power source.

REFERENCES:
patent: 3218485 (1965-11-01), Takai
patent: 4021704 (1977-05-01), Norbeck

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