Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Series connected motors
Patent
1989-06-29
1992-11-10
Wysocki, A. Jonathan
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Series connected motors
318 52, H02P 500
Patent
active
051631709
ABSTRACT:
For a traction vehicle having two wheels driven by separate electric motors, a spin/stall condition is indicated if one of the wheels is rotating faster than a predetermined reference speed while the other wheel is not rotating, and a total stall condition is indicated if neither wheel is rotating and the magnitude of motor current exceeds a predetermined high level. Correction of any spin/stall condition is attempted by temporarily connecting a power resistor across the motor driving the spinning wheel, whereupon current (and hence torque) in the motor driving the stalled wheel will increase. Once a total stall is indicated, it is allowed to continue for a maximum period of time that varies inversely with the motor current magnitude, and if such condition is not earlier corrected motor damage is avoided by deenergizing both motors on the expiration of this period.
REFERENCES:
patent: 3760246 (1973-09-01), Gurwicz et al.
patent: 3898937 (1975-08-01), Johnson
patent: 4012680 (1977-03-01), Dickerson et al.
patent: 4028597 (1977-06-01), Delaney et al.
patent: 4292531 (1981-09-01), Williamson
Payne R. T.
Wysocki A. Jonathan
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