Conceptual design of self-sensing actuator based on giant magnetostrictive material

This Paper presents the conceptual design of a self-sensing actuator (SSA) based on giant magnetostrictive material, which consists of variable-air-gap with a displacement amplification mechanism. A driving solenoid coil, surrounds the GMM rod, used to sense changes of magnetic induction in GMM. Modeling and simulation are used to validate the concept. Sensing relation is derived, uniformity and intensity of magnetic field in GMM is analyzed, magnetic circuit configuration is optimized. Then, the key structure factors influence intensity and uniformity of magnetic field in SSA is calculated. At last, Sensing application of actuator in actuation with magnetic field and compressive stress are analyzed, verify feasibility of conceptual design.