Control apparatus for an electric car

Details Control apparatus for an electric car Control apparatus for an electric car

1977-07-07

1979-10-16

Rubinson, Gene Z.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318247, 318353, 318426, H02P 506

Patent

active

041715063

ABSTRACT:
In an electric car, wherein the powering drive and the braking drive are executed by on-off controlling a current through a d. c. motor by means of a chopper, when the electric car is below a predetermined speed, a field coil of the d. c. motor is put into a series winding connection so as to carry out full field control, and when the car is above the predetermined speed, the field coil of the d. c. motor is changed-over to a shunt winding connection so as to carry out weak field control.
The duty cycle of the chopper is controlled with the running state of the electric car taken into consideration in order that the field current at the time when the series winding connection has been changed-over to the shunt winding connection may become substantially equal to a value before the change-over, whereby the transient change of the current between before and after the change-over of the field coil is suppressed.

REFERENCES:
patent: 3466522 (1969-09-01), Cushing, Jr.
patent: 3697852 (1971-04-01), Gerbitz
patent: 3755724 (1973-08-01), Anderson

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