High-force high-strain wide-bandwidth linear actuator using the magnetostrictive material Terfenol-D

High force, high strain, wide bandwidth linear actuators are now available driven by the new class of `giant' magnetostrictive material called Terfenol-D. Performance data are reported which allow evaluation of several actuator designs. Strokes over 100 (mu) , clamped forces to 1700 N, and a frequency range of dc to over 3 KHz are available from small actuators. Fundamental principles of linear actuator design based on Terfenol-D drive are discussed, along with Terfenol-D characteristics which can be altered to affect actuator performance. Terfenol-D piezomagnetic constants which adapt to external variables, along with the self sensing capabilities of Terfenol-D actuators, will allow development of advanced control capabilities, or smart actuators.