Time-ratio control having bidirectional speed potentiometer

Details Time-ratio control having bidirectional speed potentiometer Time-ratio control having bidirectional speed potentiometer

B - Operations, Transporting

60

L

323/11, 342/34.4

B60L 15/20 (2006.01) B60L 11/18 (2006.01) H02P 7/08 (2006.01) H02P 7/29 (2006.01)

Patent

CA 1038064

ABSTRACT OF THE DISCLOSURE A vehicle is driven by a traction motor energized by pulses of current from a battery conducted by a power switch and has forward and reverse contractors to control motor direction and a variable time-ratio control for regulating motor speed including an RC timing circuit in series with a bidirectional speed potentiometer whose resistance element is provided with a midtap for selectively varying time duration of the pulses. The speed potentiometer wiper is coupled to a manual speed and direction selecting lever having a neutral position wherein the speed potentiometer wiper engages the midtap so that duty cycle of the pulses is minimum and neither contactor is energized, and actuation of the lever in either direction from neutral increases the time duration of the pulses and also energizes the forward or the reverse contactors to thereby control direction of vehicle travel.

228107

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