Magnetic fan device

A magnetic fan device includes a stator, at least three bearings fixed on the stator, a rotor fixedly connected to the stator, a motor, and at least three magnetic posts. The at least three bearings are permanent magnets. The rotor includes a shaft and a plurality of impellers rotatably connected to the shaft. The at least three magnetic posts with an opening at its lateral surface are configured for respectively receiving the at least three bearings by the opening. A first magnet is adhered to ends of the at least three magnetic posts, and a second magnet is adhered to opposite ends of the at least three magnetic posts. The magnetic pole of the first magnet adjacent to ends of the at least three bearings is opposite to the magnetic pole of the second magnet adjacent opposite ends of the at least three bearings.

BACKGROUND

1. Technical Field

The present disclosure relates to device cooling and, particularly, to a magnetic fan device with reduced vibration.

2. Description of Related Art

Electronic devices, such as notebook computers, generate heat which must be dissipated by a fan device in order that the service life of the electronic device is prolonged. The fan device often includes a housing, a stator fixed in the housing, and a rotor rotatably connected to the stator. Due to frequent rotation of the rotor, the stator can wear out, and vibrate relative to the housing as a result.

Therefore, what is needed is a magnetic fan device to overcome the described shortcoming.

DETAILED DESCRIPTION

Referring toFIGS. 1-2, an embodiment of a magnetic fan device1is illustrated. The magnetic fan device1includes a motor10, a stator30, at least three bearings20fixed on the stator30, a rotor40, and at least three magnetic posts50with an opening in its lateral surface. The at least three bearings20each include a first end201and a second end202opposing to the first end201. The rotor40is fixed to the stator30. A first magnet51is adhered to ends of the at least three magnetic posts50, and a second magnet52is adhered to opposite ends of the at least three magnetic posts50. The magnetic pole of the first magnet51adjacent to the first end201of the at least three bearings20is opposite to the magnetic pole of the second magnet52adjacent to the second end202of the at least three bearings20. The at least three bearings20are permanent magnets, and respectively received in the at least three magnetic posts50. Since the magnets of the like polarity will repel and those of different polarity will attract, when the magnetic force between the bearing20and the first magnet51and the magnetic force between the bearing20and the second magnet52overcome a limitation of the gravity of the bearing20and the stator30and the rotor40, the stator30and the at least three bearings20will be respectively suspended in a space of among at least three magnetic posts50, thereby reducing vibration of the fan device1. In one embodiment, the at least three bearings20are cylindrical, and four bearings20deployed. In order to better understand the disclosure, an exemplary embodiment follows in detail.

The magnetic fan device1further includes a base11. The at least three magnetic posts50are fixed on a top surface of the base11.

The stator30includes at least three extending portions301extending from an edge thereof. Each extending portion301defines a through hole310. The at least three bearings20are respectively fixed in the through holes310, thereby fixing the at least three bearings20to the stator30. The stator30defines a rounded perforation320for receiving the rotor40.

The rotor40includes a shaft42and a number of impellers41rotatably connected to the shaft42. The motor10is electrically connected to the rotor40, and is configured for providing a power supply for the impellers41to rotate about the shaft42in the rounded perforation320.

The at least three magnetic posts50each includes a top501and a bottom502. The top501is operable to separate from the magnetic post50. The first magnet51is adhered to a bottom surface of the top501. The second magnet52is adhered to a top surface of the bottom502.

During assembly of the magnetic fan device1, the at least three bearings30are respectively fixed to the through holes310of the stator30. The rotor40is received in the rounded perforation320of the stator30. The at least three bearings20are respectively placed in the magnetic posts50, and then the tops501are covered. Due to magnetic action, the stator30and the at least three bearings20are respectively suspended in a space among the at least three magnetic posts50.