Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Plural – diverse motor controls for different motors
Patent
1978-10-27
1981-08-18
Weldon, Ulysses
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Plural, diverse motor controls for different motors
318 53, 318 59, 318 65, 318 67, 180 65, H02P 154
Patent
active
042849292
ABSTRACT:
Control circuitry for producing signals to control motors which propel a ile platform for a standing paraplegic. Logic circuits connect a 3-axis joy stick controller to four permanent magnet DC motors mounted on the platform such that the platform follows in the direction of the displacement of the joy stick. The joy stick outputs are taken as inputs to several differential amplifiers. Each of a plurality of velocity servo amplifiers receives one input signal from the differential amplifier output and another from a tachometer feedback signal derived from each motor. Comparators receive the velocity servo amplifier outputs as well as a triangular wave input. Each comparator comprises a pulse width modulator which generates pulse outputs whose duty cycle is a function of the voltage inputs to each comparator. The comparator outputs then control motor rotation such that the platform moves in the direction of displacement of the joy stick.
REFERENCES:
patent: 3260826 (1966-07-01), Johnson
patent: 3351148 (1967-11-01), Solomon
patent: 3731756 (1973-05-01), Hajec
patent: 3812929 (1974-05-01), Farque
patent: 3814199 (1974-06-01), Jones
patent: 3970160 (1976-07-01), Nowick
patent: 4054319 (1977-10-01), Fogg, Jr. et al.
patent: 4106583 (1978-08-01), Nemeth
patent: 4119164 (1978-10-01), Fogg, Jr. et al.
Allen Craig R.
Garrett Robert A.
Silva John
Fendelman Harvey
Johnston Ervin F.
Sciascia Richard S.
The United States of America as represented by the Secretary of
Weldon Ulysses
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