Linear voice coil actuator with compensating coils
US6713904B2 · kind B2 · utility
3Cited by
7References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 27, 2001 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Jul 29, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/083
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An actuator is provided in which one or more separate compensating coils are employed to alter the distribution of the magnetic flux density in the air gap to produce a substantially constant force throughout the stroke; and in which current in the separate compensating coils can be adjusted with the stroke using separate power supplies and position feedback.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.