Electricity: motive power systems – Plural diverse motor controls – Motor-reversing
Patent
1974-09-03
1976-09-21
Schaefer, Robert K.
Electricity: motive power systems
Plural diverse motor controls
Motor-reversing
318341, H02P 708
Patent
active
039821617
ABSTRACT:
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 contactors 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.
REFERENCES:
patent: 3209227 (1965-09-01), Berman et al.
patent: 3349309 (1967-10-01), Dannettell
patent: 3683253 (1972-08-01), Rummel et al.
patent: 3684945 (1972-08-01), Hermansson et al.
patent: 3713009 (1973-01-01), Poppinger et al.
Allis-Chalmers Corporation
Duncanson Jr. W. E.
Kaiser Lee H.
Schaefer Robert K.
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