Sealed magnetic fluid bearing for polygon mirror drive motor
US5325006A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1991 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Apr 29, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor with a magnetic fluid bearing for suppressing vibration and irregular rotation as well as preventing the magnetic fluid from being scattered from a bearing portion in the inside of the motor. The motor includes a rotor having a polygon mirror mounted thereon, a stator unit having driving coils, a rotor position detector and a rotor revolution detector attached thereto, a magnetic fluid bearing unit having a magnetic seal and a dynamic pressure seal attached thereto and a magnetic bearing. A triple seal structure for magnetic fluid which includes a first fluid seal constituted by the seals of the bearing unit, a second fluid seal constituted by a magnet of the rotor and a third fluid seal constituted by a seal of the magnetic magnet is provided in the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.