Circuit and method of driving a DC motor
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United States of America Patent
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-
Nov 8, 1994
Grant Date -
N/A
app pub date -
Jun 1, 1992
filing date -
Jun 7, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A circuit and a method of driving a DC motor is provided in which a DC power to be supplied to the DC motor is oscillated in phase for producing a variable torque. As the torque is varied, its peak value increases while its average remains unchanged. Hence, the maximum torque needed for starting rotation will successfully be obtained. Once the rotation starts, a lower torque is accepted for continuous rotation of a load. The rotation can thus be conducted by a lower amplitude of the variable torque. Accordingly, when the rotating torque of the motor becomes low due to increase in unwanted load or declination in capability, the motor can remain operable without troublesome repair or replacement.
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