Magnetic transducer with ferrofluid end bearings
US7288860B2 · kind B2 · utility
37Cited by
66References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 2004 |
| Grant date | Oct 30, 2007 |
| Priority date | — |
| Expiry date | Jun 30, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/088
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical generator includes one or more magnets that move relative to one or more conductors to generate an electrical signal in each conductor. Each magnet has ferrofluid bearings in the vicinity of its opposite ends to provide a low friction interface between the magnet and a support structure. The ferrofluid bearings establish a field expansion medium that directs at least a portion of the magnetic field so that a greater portion of the field intersects the conductors than in the absence of the medium. The magnet aspect ratio is preferably on the order of unity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.