Electricity: motive power systems – Motor-reversing – Field circuit control
Patent
1976-11-15
1979-03-27
Schaefer, Robert K.
Electricity: motive power systems
Motor-reversing
Field circuit control
318300, 307 10R, 307115, 307252C, H02P 108
Patent
active
041468260
ABSTRACT:
Gate-turn-off silicon controlled rectifiers (GTO's) are selectively rendered conductive to control the direction of rotation of a bi-directional motor. To this end a digital logic network is responsive to either one or both of a pair of remotely located switches being operated to either a first or a second condition, for controlling a transistorized gate signal generating network to apply an operating voltage to the gate electrode of the appropriate one(s) of the GTO's. The gate signal generating network includes circuitry for grounding the gates of the GTO's, turning them off if on and thereby inhibiting operation of the motor, whenever either of two operating conditions obtains. The first of these conditions occur when the switches are operated sequentially to be concurrently one in the first condition and the other in the second condition, and the second of these conditions is when one of the switches is returned from the first or second condition to a neutral condition with the other switch being in the neutral condition.
REFERENCES:
patent: 3147423 (1964-09-01), DuRocher
patent: 3229181 (1966-01-01), Evans
patent: 3302090 (1967-01-01), Rayfield
patent: 3519907 (1970-07-01), White
patent: 3588656 (1971-06-01), Shofner
patent: 3688173 (1971-08-01), Ballou
patent: 3694715 (1972-09-01), Van der Linde
patent: 3697846 (1972-10-01), Mueller
patent: 3928775 (1975-12-01), Steigerwald
patent: 4044286 (1977-08-01), Adams
Christoffersen H.
Feeney William L.
Limberg A. L.
O'Meara J. M.
RCA Corporation
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