Plugging defeat system for electric motors

Electricity: motive power systems – 'anti-braking' or braking-prevention means

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Details

318284, 318373, 310103, 200 6139, 335 29, H01H 3506, H02P 310

Patent

active

044994095

ABSTRACT:
A plugging defeat system for use with a reversible electric motor having a motor shaft. A slipping clutch-type mechanism is used to sense the speed and direction of the motor and to selectively open forward or reverse enabling switches when the motor reaches a predetermined speed. If operating in the forward direction, the clutch mechanism will open the reverse enabling switch, once the predetermined speed is reached, preventing motor reversal until the speed has fallen to a safe level, and vice versa.

REFERENCES:
patent: 1791458 (1931-02-01), Whittingham
patent: 2209368 (1940-07-01), Whittaker
patent: 2467785 (1946-04-01), Strong
patent: 2494611 (1950-01-01), Eisenberg
patent: 2661451 (1953-12-01), Tamm
patent: 2718567 (1955-09-01), Elliott
patent: 3164698 (1965-01-01), Perrine
patent: 3450850 (1969-06-01), Raschke
patent: 3527905 (1970-09-01), Doi
patent: 3551769 (1970-12-01), Tedd
patent: 4406934 (1983-09-01), Elszasz
Brochure "Magnetic Drives", from Indiana General Co., Engineering Data Form 382, Mar. 1970.

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