| 摘要 |
A DC brushless motor is provided in which the stator has a central annular portion defining a central aperture, a plurality of winding core members which extend radially from the central annular portion and a plurality of intermediate core members which extend radially from the central annular portion and are positioned intermediate the winding core portions. A single stator winding extends around the winding core portions. The coils of the winding on adjacent winding core portions are wound in opposite directions electrically. A control circuit is provided for simultaneously exciting all of the winding coil portions and for electrically reversing the exciting current as a function of the rotational position of the rotor. A Hall sensor is positioned intermediate a winding core portion and an intermediate core portion and is connected to the control circuit for detecting the rotational position of the rotor with respect to the stator. The control circuit is responsive to the rotational position of the rotor for selectively reversing the current passing through the windings. Thermal sensing means are provided for altering the operation of the control circuit to effect adjustment of the motor speed and to operate the fan at the minimum speed required to maintain desired temperatures, whereby noise generated by the fan is minimized.
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