Patent ID: 8111030

Claim:
A motor control apparatus, electrically connected to a motor and receiving a first rotation-speed control signal, comprising: a phase switching unit electrically connected to the motor for controlling a coil set of the motor to generate magnetization so as to drive a rotor of the motor to rotate; a sensing unit detecting the coil set of the motor to retrieve a rotation-speed sensing signal and outputting the rotation-speed sensing signal; a judging unit electrically connected to the sensing unit and having a preset duty cycle value, wherein the judging unit receives the first rotation-speed control signal and the rotation-speed sensing signal, and the judging unit compares the first rotation-speed control signal and the preset duty cycle value so as to decide to switch on a first circuit loop or a second circuit loop; a rotation-speed weighting unit electrically connected to the judging unit and operating when the second circuit loop is switched on, wherein the rotation-speed weighting unit operates to retrieve the first rotation-speed control signal and the rotation-speed sensing signal from the judging unit and generates a second rotation-speed control signal after calculation; and a rotation-speed control unit electrically connected to the judging unit, the sensing unit, the rotation-speed weighting unit and the phase switching unit, wherein when the first circuit loop is switched on, the rotation-speed control unit retrieves the first rotation-speed control signal from the judging unit and controls the phase switching unit according to the first rotation-speed control signal to drive the motor to generate magnetization so as to rotate the rotor, and when the second circuit loop is switched on, the rotation-speed control unit retrieves the second rotation-speed control signal from the rotation-speed weighting unit and controls the phase switching unit according to the second rotation-speed control signal to drive the motor to generate magnetization so as to rotate the rotor; wherein the first circuit loop includes the judging unit, the rotation-speed control unit and the phase switching unit, and the second circuit loop includes the judging unit, the rotation-speed weighting unit, the rotation-speed control unit, the phase switching unit, and the sensing unit.