| 摘要 |
A small-sized heat radiator is provided to reduce an electric power, which is required for starting an electric device, by aligning an impeller rotor at a predetermined angular position, which is proper for a start-up process. A small-sized heat radiator includes an impeller rotor(50), a PCB(Printed Circuit Board)(46) and a casing(40). Plural wings are formed on an outer periphery of the impeller rotor. A magnet is fixed at a bottom of the impeller rotor, and a shaft is fixed at a center thereof. At least one coil, which is coupled with the magnet, is arranged on the PCB. The casing includes a barrier rib, a shaft tube, a bearing, and at least two position determining members. The barrier rib is formed on a base, on which the PCB is implemented. The shaft tube is elongated from a center of the base. The bearing is arranged in the shaft tube and rotatably supports the shaft of the impeller rotor. The position determining members are implemented on the base outside the shaft tube and made of a magnetically conductive material.
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