Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1994-09-09
1995-05-16
Wysocki, Jonathan
Electricity: motive power systems
Limitation of motor load, current, torque or force
388903, H02P 500
Patent
active
054163900
ABSTRACT:
A low noise loading motor drive circuit for a camera-integrated camcorder includes a rotation velocity detecting circuit for detecting a rotation number proportional to a velocity signal generated from the loading motor, a velocity signal strengthening amplifying unit for amplifying and strengthening the output signal from the rotation velocity detecting unit, and a velocity to voltage converting unit for converting the output signal from the velocity signal strengthening unit into a voltage inversely proportional to the velocity of loading motor. The circuit also includes a voltage limiting circuit for setting a rotation velocity range limited between a predetermined maximum rotation velocity and a predetermined minimum rotation velocity of loading motor, in a normal rotation made of loading motor. The voltage from velocity to voltage converting unit and the voltage limited output signal from voltage limiting circuit are summed by an adder. The output from adder is converted into an electric power by a voltage to velocity converting unit. The electric power is supplied to the loading motor via a motor drive circuit. With this arrangement, the rotation velocity of loading motor can be constant in loading/unloading operation, thereby removing annoying noise.
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Goldstar Co. Ltd.
Wysocki Jonathan
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