Shape memory alloy motor with spring energy accumulator

摘要

An energy recovery device uses a shape memory alloy (SMA) engine 1 with a one way drive mechanism 3, 4 for incrementally winding a spring 5. A release mechanism e.g. brake 7 is activated to allow the spring 5 to drive an output 6. The SMA engine may comprise a length of SMA material fixed at one end and connected at a second end to the one way drive mechanism 3, 4. The heat source may be the cooling jacket of an internal combustion engine, and the output may be used as a starter motor, or may be used to drive a generator, e.g. in place of the usual crankshaft-driven alternator.