Self-pumped fluid bearing with electromagnetic levitation such as for a light beam deflector
US5608278A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1995 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Jan 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2211/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fluid bearing includes a rotor and a stator. A DC motor drives the rotator. The DC motor has (1) a multi-phase set of coils on one of the rotor and stator and (2) a multi-pole magnet on the other of the rotor and stator opposed to the coils, the number of magnet poles being an even number which is different from the number of phases and the coils and magnet poles being arranged such that, at a predetermined position of the rotor, at least one of the coils is opposed by only one magnet pole. Commutation selectively applies DC current to the at least one coil, and not to a coil opposed by more than one magnet pole, when the rotor assembly is at the predetermined position of a polarity to cause the at least one coil to repel the opposed magnet pole, creating a magnetic force urging the bearing surfaces apart.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.