Automatic balancing apparatus
US6664670B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2001 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Mar 2, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K21/222
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An automatic balancing apparatus may be mounted in a rotator body such as a spindle motor having a rotary shaft defining an axis of rotation. The automatic balancing apparatus has a plurality of balancing members rotatable about the axis of rotation in a non-contact manner. Each of the balancing members has a balance action section spaced a distance in a radial direction from the axis of rotation and a connection section that rotatably couples the balance action section to the axis of rotation. The balance action section has a mass that effects a balance correction action to cancel a rotational unbalance of the rotator body when the rotator body rotates at a rotational speed that exceeds a resonant rotational speed CR thereof. The connection section has a mass that substantially does not affect the balance correction action compared to the balance action section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.