Phase reversal protection system

Details Phase reversal protection system Phase reversal protection system

1976-05-06

1977-08-30

Rubinson, Gene Z.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

318207R, 361 77, 318445, H02H 326

Patent

active

040456820

ABSTRACT:
A three-phase motor system is described incorporating a small fractional horsepower three-phase control motor that is connected to rotate in a predetermined direction when a three-phase drive motor is rotating in a predetermined direction. A plurality of microswitches having actuating arms with cam follower portions are mounted with the arms contacting a cam plate. When the system is energized, the cam plate is rotated to open the microswitches if the rotation of the fractional horsepower motor is reversed. The microswitches, when opened, de-energize the fractional horsepower motor and concurrently prevent the closure of a solenoid-operated start switch to prevent energization of the drive motor.

REFERENCES:
patent: 1448405 (1923-03-01), Huey
patent: 1691433 (1928-11-01), Dresser
patent: 3214664 (1965-10-01), Ishikawa
patent: 3495130 (1970-02-01), Bruner et al.
patent: 3551749 (1970-12-01), Hore
patent: 3708719 (1973-01-01), Ishikawa

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