Magnetic shaft for brushless D.C. motor
AssigneeShanghai Yen Sun Electrical Industry Co., Ltd.
InventorDuhua Sun
Life of this patent
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Abstract
A brushless D.C. motor comprises a casing, a bearing, a stator, and a rotor having a shaft. The bearing is mounted to an end of the shaft. A first magnetic member is mounted on an inner side of the casing. A second magnetic member is formed on the other end of the shaft and faces and is spaced from the first magnetic member. The shaft floats on an axis by magnetic force provided by the first and second magnetic members to thereby reduce the load to the bearing. Thus, the frictional resistance is low, and rotation of the motor is smooth with a low noise. The motor is shock-resistant and has a long life. Thus, the motor is particularly suitable for portable electronic products.
Claims5
A brushless D.C. motor comprising:
- a casing having a tube, the casing further including a removable lid and a first center magnetic pillar mounted thereon, so that changing of the first center magnetic pillar is allowed when assembled;
- a bearing mounted in the tube;
- a stator mounted around the tube;
- and
- a rotor rotatably mounted around the stator and having a shaft rotatably received in the tube, the shaft including a first end attached to the rotor and a second end, a second magnetic rod being integrally formed on the second end of the shaft and facing and being spaced from the first center magnetic pillar for attracting each other, the first center magnetic pillar being positioned and axially aligned with the second magnetic rod on a common axis, the first center magnetic pillar and the second magnetic rod cooperating with the bearing to maintain the shaft in a plane on which the shaft is installed.
Dependencies are inferred from the claim text.