Integral motor controller

Details Integral motor controller Integral motor controller

1977-02-23

1978-02-28

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Contact-actuating means

335 16, 335174, H01H 7710

Patent

active

040770265

ABSTRACT:
A motor controller having a single set of contacts and two contact operating systems is provided for operation and protection of a motor and the associated circuitry over a complete range of possible currents. For a normal motor starter operation and for fault current up to a predetermined value, an electromagnetic actuator is used to open the contacts a relatively small distance such as 1/4 inch. For higher fault currents a magnetic drive or linear slot motor opens the contacts to a greater spacing such as 1 inch. The slot motor opens the contacts very rapidly giving rise to good current limiting. The disclosed integral motor starter utilizes a bridging contact arm on which are mounted a pair of movable contacts which are aligned to engage a pair of stationary contacts when the disclosed motor starter is closed, completing an electric circuit to the controlled motor.

REFERENCES:
patent: 3651436 (1972-03-01), Cooper et al.
patent: 3663903 (1972-05-01), Kussy et al.
patent: 3824508 (1974-07-01), Terracol
patent: 3987382 (1976-10-01), Cataldo et al.

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