Motor control method
First Claim
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1. A motor control method, comprising steps of:
- retrieving a rotation-speed sensing signal;
receiving a first rotation-speed control signal;
comparing the first rotation-speed control signal and a preset duty cycle value; and
when the first rotation-speed control signal is higher than the preset duty cycle value, generating a second rotation-speed control signal after calculating the first rotation-speed control signal and the rotation-speed sensing signal, wherein the second rotation-speed control signal is then outputted to drive a motor to generate magnetization so as to rotate a rotor of the motor;
when the first rotation-speed control signal is lower than the preset duty cycle value, outputting the first rotation-speed control signal to drive the motor to generate magnetization so as to rotate the rotor of the motor.
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Abstract
A motor control apparatus and a motor control method determine whether the motor is in a back-pressure area so as to provide different rotation-speed control signals. When the fan is in the low duty cycle, a first circuit loop is switched on, so that the fan has more accurate rotation speed. When the fan is in the high duty cycle, a second circuit loop is switched on, so that the rotation speed of fan does not be limited to a constant rotation-speed as the fan enters the back-pressure area. Thus, the fan has larger airflow quantity and higher airflow pressure.
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Citations
8 Claims
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1. A motor control method, comprising steps of:
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retrieving a rotation-speed sensing signal; receiving a first rotation-speed control signal; comparing the first rotation-speed control signal and a preset duty cycle value; and when the first rotation-speed control signal is higher than the preset duty cycle value, generating a second rotation-speed control signal after calculating the first rotation-speed control signal and the rotation-speed sensing signal, wherein the second rotation-speed control signal is then outputted to drive a motor to generate magnetization so as to rotate a rotor of the motor; when the first rotation-speed control signal is lower than the preset duty cycle value, outputting the first rotation-speed control signal to drive the motor to generate magnetization so as to rotate the rotor of the motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification