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Title: Shape memory alloy heat engines and energy harvesting systems

A heat engine includes a first rotatable pulley and a second rotatable pulley spaced from the first rotatable pulley. A shape memory alloy (SMA) element is disposed about respective portions of the pulleys at an SMA pulley ratio. The SMA element includes a first wire, a second wire, and a matrix joining the first wire and the second wire. The first wire and the second wire are in contact with the pulleys, but the matrix is not in contact with the pulleys. A timing cable is disposed about respective portions of the pulleys at a timing pulley ratio, which is different than the SMA pulley ratio. The SMA element converts a thermal energy gradient between the hot region and the cold region into mechanical energy.
Authors:
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Publication Date:
OSTI Identifier:
1159948
Report Number(s):
8,844,281
13/340,964
DOE Contract Number:
AR0000040
Resource Type:
Patent
Research Org:
GM Global Technology Operations LLC, Detroit, MI (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING