Motors: expansible chamber type – With correlated control of motive fluid and locking means – Sequential operation of locking means and motive fluid control
Patent
1982-01-05
1984-05-22
Garrett, Robert E.
Motors: expansible chamber type
With correlated control of motive fluid and locking means
Sequential operation of locking means and motive fluid control
91 45, 74640, 74805, F15B 1526
Patent
active
044494424
ABSTRACT:
This invention relates to a motor control unit and a feedback arrangement to minimize the effects of backlash in a rotary output system. The system includes a source of energy. The motor control has a directional control element moveable from a null position. The motor control unit is coupled to the source of energy and to a motor which in turn is coupled to the rotary output and to a second input of a differential harmonic drive that has first and second inputs and an output. The first input of the differential harmonic drive is coupled to a rotational command input unit and the differential harmonic drive output is drivingly coupled to the moveable direction control element. In response to a given rotational command input when the second input is in an initial static position, whereupon the motor is coupled to the source of energy through the motor control unit, the rotary output is driven a precise number of revolutions dependent upon the given rotational command input. The second input is simultaneously driven a given number of revolutions in a direction to provide feedback, such that the differential harmonic drive output moves to return the moveable element to the null condition, and the system is then in a condition to respond to additional rotational command input.
REFERENCES:
patent: 2820600 (1958-01-01), Brunner
patent: 2966808 (1961-01-01), Grudin
patent: 3214999 (1965-11-01), Lapp
patent: 3662550 (1972-05-01), Lichtfuss
patent: 3918326 (1975-11-01), Kida et al.
patent: 4338831 (1982-07-01), Rodaway
Ebbing Steven J.
Hermans Robert J.
Garrett Robert E.
Killingsworth Ted E.
McMurry Michael B.
Moritz S.
Sundstrand Corporation
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