Driving apparatus and motor
First Claim
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1. A driving apparatus for a fan motor, comprising:
- a digital filter configured to convert, into a digital value, a duty ratio of a control signal which is pulse width modulated according to a target torque to be set for a fan motor to be driven;
a sampling circuit configured to perform sampling of an output value of the digital filter at a sampling timing that is asynchronous with respect to a cycle of the control signal, so as to generate a torque instruction value; and
a driving circuit configured to drive the fan motor according to the torque instruction value.
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Abstract
A digital filter is configured to convert, into a digital value, the duty ratio of a control signal subjected to pulse width modulation according to a target toque to be set for a fan motor to be driven. A sampling circuit is configured to perform sampling of the output value of the digital filter at a sampling timing that is asynchronous with respect to the cycle of the control signal, so as to generate a torque instruction value. A driving circuit is configured to drive the fan motor according to the torque instruction value thus generated.
16 Citations
14 Claims
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1. A driving apparatus for a fan motor, comprising:
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a digital filter configured to convert, into a digital value, a duty ratio of a control signal which is pulse width modulated according to a target torque to be set for a fan motor to be driven; a sampling circuit configured to perform sampling of an output value of the digital filter at a sampling timing that is asynchronous with respect to a cycle of the control signal, so as to generate a torque instruction value; and a driving circuit configured to drive the fan motor according to the torque instruction value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A driving method for a fan motor, the driving method comprises:
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generating a control signal which is pulse width modulated according to a target torque to be set for the fan motor; smoothing the control signal by means of a digital filter; sampling an output value of the digital filter at a sampling timing that is asynchronous with respect to a cycle of the control signal, so as to generate a torque instruction value; and driving the fan motor according to the torque instruction value. - View Dependent Claims (11, 12, 13, 14)
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Specification