Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1995-05-16
1997-01-21
Cabeca, John W.
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318266, 318455, 49 28, H02P 308
Patent
active
055962530
ABSTRACT:
A vehicle-mounted motor drive apparatus which stops the rotation of a motor immediately after an object obstructs a movable part driven by the motor. The drive apparatus includes a motor drive device for selectively driving and stopping a motor, an electric current measuring device for measuring a value of electric current flowing through the motor, a change-in-current-value detecting device for detecting an incremental change in the motor current, and a motor control device for supplying a first control signal or a second control signal to the motor drive device. The motor drive device continuously drives the motor according to the polarity of the detected increment of the current value in response to the first control signal, and immediately stops driving the motor in response to the second control signal.
REFERENCES:
patent: 4220900 (1980-09-01), Mintz
patent: 4709196 (1987-11-01), Mizuta
patent: 4746845 (1988-05-01), Mizuta et al.
patent: 5069000 (1991-12-01), Zuckerman
patent: 5076016 (1991-12-01), Adams et al.
Fujioka Kazunori
Miura Yukio
Mizuta Ken
Saito Toshimichi
Shibazaki Ken
Alps Electric Co. ,Ltd.
Bever Patrick T.
Cabeca John W.
Shoup Guy W.
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