Patent ID: 7976292

Claim:
An inner-rotor-type heat dissipating fan, comprising: a fan housing including an outer frame portion having an air inlet and an air outlet respectively in two ends thereof, and a motor casing coupling to the outer frame portion through a plurality of connecting members, with a passageway connecting to and between the air inlet and the air outlet, wherein the motor casing is a sleeve having first and second openings and includes a positioning portion in a form of a shoulder inside the sleeve between the first and second openings; a seal casing being a hollow housing made of magnetically conductive material, with the seal casing inserted into the first opening of the sleeve and being spaced from the second opening, with one end of the seal casing forming a connecting portion coupling to the motor casing; an inner-rotor-type motor mounted inside the seal casing and including a rotor and a stator rotatably receiving the rotor, with the rotor having a shaft and a magnetic element fixed to an outer periphery of the shaft and facing the stator, with the shaft extending through the first opening and into a positioning member, with the positioning member inserted through the second opening and abutting with the positioning portion; an impeller coupled to the shaft and outside the seal casing and the first opening; and a circuit board electrically connected to the stator, wherein the sleeve has a supporting portion formed on an inner periphery thereof and intermediate the positioning portion and the first opening, with the connecting portion of the seal casing abutting against the supporting portion.