Bi-stable actuator based on electromagnetic attraction
US11139098B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2017 |
| Grant date | Oct 5, 2021 |
| Priority date | — |
| Expiry date | Aug 13, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2027/2809
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electromagnetic actuator comprising a moving armature (41) comprising a pin (43) and a permanent magnet arrangement (45) arranged coaxially with the pin (43) and secured to it, and an excitation coil arrangement (42) arranged coaxially with the pin (43). The coil arrangement (42) is suppliable with a current to cause a movement of the movable armature (41). The actuator further comprises a surface (51) of ferromagnetic material. The permanent magnet arrangement (45) is axially interposed between the surface (51) of ferromagnetic material and the excitation coil arrangement (42). The permanent magnet arrangement (45) comprises a plurality of permanent magnet regions (45a) arranged around the pin (43) of the moving armature (41), wherein each permanent magnet region (45a) has a polarity opposite to the polarities of the permanent magnet regions (45a) angularly adjacent thereto. The excitation coil arrangement (42) comprises a coil having a lobed shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.