| 摘要 |
<p>A method and an apparatus for driving a sensorless DC motor having a bridge-type inductance detecting circuit. The method of driving a sensorless DC motor including a rotor having Y-winding phase coils and a plurality of magnetic poles comprises the steps of applying an alternating current voltage signal to bridge circuits coupled to the phase coils, respectively, inputting an output voltage signal of each bridge circuit as an inductance detecting signal of each phase coil, amplifying the inputted inductance detecting signal of each phase coil, comparing a value of the amplified inductance detecting signal of each phase coil to each other, and determining an initial position of the rotor for rotating the rotor, the phase coils except for a phase coil having a maximum inductance detecting signal being magnetized at the initial position. By the method, the initial position of the rotor can be precisely detected even when the rotor is rotated at a low speed or in a stop state, so the motor is reliably driven. <IMAGE></p> |
