Moving coil actuator utilizing flux-focused interleaved magnetic circuit
US5345206A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1993 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Jun 10, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/066
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cylindrically-symmetrical moving coil linear actuator utilizes axially-magnetized cylindrical magnets to provide flux-focused interleaved magnetic circuits. The moving coil linear actuator includes a cylindrical shell that has a closed end and open end. A magnetic core is disposed within the shell to define an annular air gap between the shell and the core. The core includes a first set of axially-magnetized cylindrical permanent magnets having a first direction of magnetization and disposed in proximity to the closed end of the shell. A second set of axially-magnetized cylindrically permanent magnets has a second direction of magnetization which is opposite of the first direction of magnetization and is disposed in proximity to the open end of the shell. A first ferro-magnetic pole piece is disposed between the first set of magnets and the second set of magnets. A second ferro-magnetic pole piece is disposed between the second set of magnets and the open end of the shell. A moving coil assembly is disposed within the annular air gap. The coil assembly includes a non-magnetic coil carrier disposed within the air gap. A first coil winding is formed on the coil carrier in proximity…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.