Motor driving apparatus
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United States of America Patent
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Mar 9, 2010
Grant Date -
May 8, 2008
app pub date -
Dec 20, 2005
filing date -
Dec 22, 2004
priority date (Note) -
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Abstract
In a motor driving apparatus, a control unit detects a rotation frequency of a motor to be driven and generates a control voltage Vcnt in a manner such that the rotation frequency thereof is brought close to a desired rotation frequency. A clamping circuit sets an upper limit Vcu and a lower limit Vcl of the control voltage Vcnt. A drive unit drives the motor based on the control voltage Vcnt generated by the control unit. A start circuit fixes the control voltage Vcnt to a predetermined initial voltage Vinit at the start of driving the motor.
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