Micro fan

Patent metadata

Field	Value
Publication number	US-10989205-B2
Application number	US-202017025994-A
Country	US
Kind code	B2
Filing date	Sep 18, 2020
Priority date	Jul 25, 2016
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

A micro fan is provided. The micro fan includes a rotor and a stator. The stator includes an axial induced coil unit and a circuit board. The axial induced coil unit is made by twining a coil in an axial direction for at least two layers and in a radial direction for at least two layers.

First claim

What is claimed is:

1. A micro fan, comprising:
a rotor; and
a stator, comprising an axial induced coil unit and a circuit board, wherein the axial induced coil unit is made by twining a coil in an axial direction for at least two layers and in a radial direction for at least two layers,
wherein an end contact of the axial induced coil unit, which is connected to one end of the coil, is cut from a lead frame,
wherein the axial induced coil unit generate an magnetic force to rotate the rotor,
wherein the stator has a stator coil magnetic pole, and the stator coil magnetic pole provides a magnetic attraction force and a magnetic repulsion force alternately toward rotor magnets of the rotor to rotate the rotor,
wherein the stator further comprises a bearing, and the bearing passes through a center of the circuit board,
wherein the rotor comprises a magnetic ring, a magnetic conduction shield and a plurality of blades, the magnetic conduction shield is disposed between the magnetic ring and the blades, the magnetic conduction shield comprises a shaft, and the shaft passes through the bearing.

2. A micro fan, comprising:
a rotor; and
a stator, comprising an axial induced coil unit and a circuit board, wherein the axial induced coil unit is made by twining a coil into a flat-shaped bundle,
wherein an end contact of the axial induced coil unit, which is connected to one end of the coil, is cut from a lead frame,
wherein the axial induced coil unit generate an magnetic force to rotate the rotor,
wherein the stator has a stator coil magnetic pole, and the stator coil magnetic pole provides a magnetic attraction force and a magnetic repulsion force alternately toward rotor magnets of the rotor to rotate the rotor,
wherein the stator further comprises a bearing, and the bearing passes through a center of the circuit board,
wherein the rotor comprises a magnetic ring, a magnetic conduction shield and a plurality of blades, the magnetic conduction shield is disposed between the magnetic ring and the blades, the magnetic conduction shield comprises a shaft, and the shaft passes through the bearing.

3. A micro fan, comprising:
a rotor; and
a stator, comprising an axial induced coil unit and a circuit board, wherein the stator is produced by the following steps:
providing the axial induced coil unit;
directly mounting the axial induced coil unit on the circuit board by surface mount technology, and the axial induced coil unit is a magnetic pole unit of the stator,
wherein an end contact of the axial induced coil unit, which is connected to one end of the coil, is cut from a lead frame,
wherein the axial induced coil unit generate an magnetic force to rotate the rotor,
wherein the stator has a stator coil magnetic pole, and the stator coil magnetic pole provides a magnetic attraction force and a magnetic repulsion force alternately toward rotor magnets of the rotor to rotate the rotor,
wherein the stator further comprises a bearing, and the bearing passes through a center of the circuit board,
wherein the rotor comprises a magnetic ring, a magnetic conduction shield and a plurality of blades, the magnetic conduction shield is disposed between the magnetic ring and the blades, the magnetic conduction shield comprises a shaft, and the shaft passes through the bearing.

4. The micro fan as claimed in claim 3 , wherein the axial induced coil unit is made by twining a coil in a radial direction for multilayers.

5. The micro fan as claimed in claim 3 , wherein the axial induced coil unit is made by twining a coil in a radial direction for multilayers and in an axial direction for multilayers.

6. The micro fan as claimed in claim 3 , wherein the axial induced coil unit is made by twining a coil into a circular-shaped bundle.

7. The micro fan as claimed in claim 3 , wherein the axial induced coil unit is made by twining a coil into a flat-shaped bundle.

8. The micro fan as claimed in claim 3 , wherein there is no magnetic conduction element disposed in a center of the axial induced coil unit.

9. The micro fan as claimed in claim 3 , further comprising a fan frame, wherein the rotor is disposed on the fan frame, and the stator is affixed to the fan frame.

10. The micro fan as claimed in claim 9 , further comprising a magnetic conduction sheet, wherein the magnetic conduction sheet is disposed on the fan frame and corresponds to the axial induced coil unit.

11. The micro fan as claimed in claim 3 , further comprising a wear-resistant pad, wherein the wear-resistant pad is disposed on the fan frame, and the shaft abuts the wear-resistant pad.

12. The micro fan as claimed in claim 3 , wherein the stator further comprises a micro controller, and the micro controller is disposed on the circuit board.

13. The micro fan as claimed in claim 3 , wherein the two ends of the axial induced coil unit are formed by two connection terminals.

14. The micro fan as claimed in claim 1 , wherein the magnetic force is switched between a magnetic attraction force and a magnetic repulsion force.

Assignees

• Delta Electronics Inc

Inventors

• Lu Chao-Wen
• Chan Chih-Wei
• Lee Che-Wei

Classifications

• H02K15/33

  Connecting winding sections; Forming leads; Connecting leads to terminals · CPC title

• H02K15/22

  Shaping or compacting conductors in slots or around salient poles (H02K15/28 takes precedence) · CPC title

• F05B2230/60

  Assembly methods · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• H02K7/14 Primary

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title