Automatic balancing apparatus
US6479912B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2001 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Apr 28, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B25/043
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An automatic balancing apparatus which includes a support shaft which is rotated by a drive; a case body which is fixed to the support shaft and which rotates together with the support shaft; a ring magnet which is placed at the inside corner, in the radial direction, of an inner space of the case body; and a balancing member. The balancing member further includes a plurality of magnetic bodies which are movable in the inner space of the case body and which can be drawn up by the magnetic field of the ring magnet. When the rotational frequency of a rotor, which rotates together with the case body, exceeds the resonant frequency, the automatic balancing apparatus reduces vibrations of the rotor; and the outer circumference of the ring magnet has a flat portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.