High efficiency voice coil motor
US7368838B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2005 |
| Grant date | May 6, 2008 |
| Priority date | — |
| Expiry date | Jul 10, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2201/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus for increasing the efficiency of a voice coil motor (VCM) are disclosed. According to one aspect of the present invention, a cylindrical and radially symmetric VCM includes a plurality of sets of magnets, and a single coil. The plurality of sets of the magnets are each arranged in an array configuration, and cooperate to form a magnetic field. The coil receives current and has a plurality of windings. A first space is defined within the coil, and the plurality of sets of the magnets are arranged such that a first set of the magnets is positioned within the first space and a second set of the magnets is positioned external to the coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.