Moving coil linear actuator with interleaved magnetic circuits
US4808955A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1987 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Oct 5, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/066
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
According to a preferred embodiment of the present invention, a double-ended moving coil linear actuator is provided comprising a cylindrical core and a hollow shell disposed around the core to define an annular space between the inner wall of the shell and the outer wall of the core. A non-magnetic spacer is mounted in the annular space to divide the annular space into first and second annular cavities, each of the cavities having a closed end adjacent the spacer and an open end. A first set of magnets is mounted within the first annular cavity to define a first magnetic circuit. A second set of magnets is mounted within the second annular cavity to define a second magnetic circuit. The magnets of these two magnetic circuits are sized and arranged to define a third "interleaved" magnetic circuit which is created by the interaction of the first two circuits. Each of the first two magnetic circuits has a dual-winding coil assembly associated with it. The windings of the assembly are arranged to correspond to the arrangement of the magnets within the associated magnetic circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.