Inner-rotor-type heat dissipating fan

Details Inner-rotor-type heat dissipating fan Inner-rotor-type heat dissipating fan

2011-07-12

2011-07-12

Kramer, Devon C (Department: 3746)

Pumps

Motor driven

Electric or magnetic motor

C310S088000, C310S091000

Reexamination Certificate

active

07976292

ABSTRACT:
An inner-rotor-type heat dissipating fan includes a fan housing, a seal casing, an inner-rotor-type motor, an impeller and a circuit board. The fan housing includes an outer frame portion and a motor casing. The seal casing is a hollow housing made of magnetically conductive material. One end of the seal casing forms a connecting portion coupling to the motor casing. The inner-rotor-type motor is mounted inside the seal casing. The impeller is coupled to the inner-rotor-type motor and outside the seal casing. The circuit board is electrically connected to the stator. By this configuration, rotation stability of the impeller is enhanced by the inner-rotor-type motor, airflow generated by rotation of the impeller is effectively concentrated and guided by the fan housing, and a sealing effect for avoiding magnetic flux leakage is provided by the seal casing. Consequently, heat dissipating efficiency is enhanced.

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