Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Slipping and/or racing control for electric motors
Patent
1977-10-21
1979-01-09
Dobeck, B.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Slipping and/or racing control for electric motors
318480, H02P 1500
Patent
active
041340485
ABSTRACT:
A wheel slip correction system of the type in which boost current is supplied to the field winding of a d-c electric traction motor driving a slipping wheel from an a-c source in order to correct the slip is provided with a control system which automatically inhibits the application of boost current if control power fails. A current transformer connected to provide power to the field winding from the a-c source has a secondary winding normally short-circuited by inversely paralleled thyristors thus inhibiting power transfer to the field winding. The thyristors are maintained short-circuited by a current amplifier connected across the transformer secondary and adapted to normally supply current to the gate terminals of the thyristors. The current amplifier is inhibited by receipt of a wheel-slip signal so that the thyristors remain non-conductive and boost current is supplied to the motor field. In a preferred embodiment, low voltage wheel slip detection circuits are isolated from the current amplifier through the use of optical couplers.
REFERENCES:
patent: 3930189 (1975-12-01), Smith
patent: 3982164 (1976-09-01), DE Buhr
Beusse J. H.
Dobeck B.
General Electric Company
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