Concentric tube shape memory alloy actuator apparatus and method
US7159398B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2005 |
| Grant date | Jan 9, 2007 |
| Priority date | — |
| Expiry date | Dec 6, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T50/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A rotary SMA actuator includes an SMA assembly having a plurality of grooves formed therein to form a plurality of concentrically arranged SMA tubes. A heater element is disposed against an input end of the SMA tubes and generates heat when electrical current is applied thereto. The heat is used to heat the SMA tubes, which causes an angular deflection of each of the tubes at an output end thereof. An innermost one of the SMA tubes is used as an output member and its angular deflection is the sum of the angular deflections of all of the SMA tubes. The actuator is of a smaller size and lighter weight than electrical, mechanical, hydraulic or pneumatic actuators of comparable torque output. The actuator also provides greater deflection capability than similarly sized SMA type actuators that do not employ concentric tubes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.