Invention Grant
US08172553B2 Small sized heat dissipating fan with outward arrangement of a speed adjuster resistor having a resistance of zero ohms 有权
小型散热风扇,外部布置有电阻为零欧姆的调速电阻

Small sized heat dissipating fan with outward arrangement of a speed adjuster resistor having a resistance of zero ohms
Abstract:
A small sized heat dissipating fan includes a housing, a stator and a rotor. The housing includes a carrying base to hold the stator and rotor. The stator includes a magnetizing member having a plurality of coils and a circuit board electrically connecting to the coils and having a driving circuit and a speed adjuster. The driving circuit, the speed adjuster and the coils electrically connect to each other. The rotor includes a shaft, an impeller fixed to one end of the shaft, and an annular magnet. The other end of the shaft extends through the magnetizing member. The shaft is rotatably coupled to the stator. The annular magnet is mounted to an inner periphery of the impeller and faces the magnetizing member of the stator. Consequently, by adjustment of resistance of the speed adjuster, the rated rotational speed of the heat dissipating fan can be changed.
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