Torque actuator incorporating shape memory alloy composites
US7810326B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2005 |
| Grant date | Oct 12, 2010 |
| Priority date | — |
| Expiry date | Dec 29, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2300/034
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Multiple embodiments of ferromagnetic shape memory alloy (FSMA) based torque actuators are described. These torque actuators include a magnetic trigger and an FSMA member, which when actuated by the magnetic trigger, produces a torque for rotating a member. Examples of magnetic triggers include hybrid magnetic triggers having at least one electromagnet and at least one permanent magnet. The FSMA member can be configured as a coil (or plate) spring and can be fabricated of a true FSMA alloy (i.e., an alloy that exhibits both ferromagnetic and shape memory properties) or of an FSMA composite that includes a ferromagnetic portion and an SMA portion. Several embodiments include a central orifice in which the FSMA member and an axial rod configured to rotate when actuated are disposed; the magnetic trigger system is disposed about the periphery of the orifice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.