Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Slipping and/or racing control for electric motors
Patent
1974-12-18
1976-12-14
Dobeck, B.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Slipping and/or racing control for electric motors
318 71, H02P 550
Patent
active
039978222
ABSTRACT:
A method and apparatus are disclosed for controlling the wheel slip of an electric or diesel electric locomotive such that optimum wheel adhesion may be attained. A certain characteristic of a series traction motor, specifically the back emf per rpm versus motor current (E
vs. I), forms the basis for a voltage control which limits the voltage (V) supply to each motor to a value which will limit the maximum percentage wheel slip. The selected limit value of wheel slip is great enough to encompass the conditions of maximum adhesion under most rail conditions. By combining the E
with the motor IR drop, motor current, and a locomotive speed signal, the idealized voltage V for a non-slip condition is derived. This voltage is increased by a factor representing the desired maximum percentage slip to obtain the limiting voltage which may be supplied to the motor. A current maximizing circuit is included to decrease the allowed percent slip from the maximum preselected value to a value which provides the maximum motor current to obtain maximum traction.
REFERENCES:
patent: 3614173 (1971-10-01), Branson
patent: 3614564 (1971-10-01), Hirotsu
patent: 3728596 (1973-04-01), Hermansson
patent: 3790871 (1974-02-01), Smith
patent: 3832609 (1974-08-01), Barrett
de Buhr Alfred P.
Liebenthal Benjamin C.
Logston, Jr. Charles F.
Meyer Bruce R.
Dobeck B.
General Motors Corporation
Hill Warren D.
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