Micro fan
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.
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.