FAN DEVICE

• US 20160301278A1
• Filed: 04/11/2016
• Published: 10/13/2016
• Est. Priority Date: 04/13/2015
• Status: Active Grant

• Current Assignee: Minebea Mitsumi, Inc.
• Original Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Inventors: OTSUKA, Shuichi
• Granted Patent: US 10,164,498 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02K 5/10 with arrangements for protection from ingress, e.g. water or fingers
• CPC Class Codes: H02K 5/128 using air-gap sleeves or air-gap discs

Abstract

A fan device includes: a stator core having a plurality of salient poles that protrude outwards in a radial direction; a rotor magnet that is rotatably provided outside the stator core; and a dustproof cover mounted to the stator core and positioned between the stator core and the rotor magnet, wherein the dustproof cover has a cylindrical part having an inner surface being provided with one or more convex part, the convex part being fitted into a slot gap between distal ends of adjacent two of the salient poles.

Claims

1. A fan device comprising:

a stator core having a plurality of salient poles that protrude outwards in a radial direction;

a rotor magnet that is rotatably provided outside the stator core; and

a dustproof cover mounted to the stator core and positioned between the stator core and the rotor magnet,

wherein the dustproof cover has a cylindrical part having an inner surface being provided with one or more convex part, the convex part being fitted into a slot gap between distal ends of adjacent two of the salient poles.

2. The fan device according to claim 1,

wherein the convex part includes a protrusion extending in an axial direction.

3. The fan device according to claim 2,

wherein a width of the convex part is equal to or greater than a width of the slot gap in a circumferential direction in a state where the convex part is unfitted into the slot gap.

4. The fan device according to claim 1,

wherein the dustproof cover is made of flexible resin.

5. The fan device according to claim 1,

wherein the cylindrical part of the dustproof cover has a tapered shape such that a diameter thereof enlarges towards a direction in which the cylindrical part is mounted to the stator core.

6. The fan device according to claim 1,

wherein the dustproof cover is made of a transparent material.