Abstract
In the field of microrobotics, actuators based on smart materials are predominant because of very good precision, integration capabilities and high compactness. This paper presents the main characteristics of Magnetic Shape Memory Alloys as new candidates for the design of micromechatronic devices. The thermo-magneto-mechanical energy conversion process is first presented followed by the adequate modeling procedure required to design actuators. Finally, some actuators prototypes realized at the Femto-ST institute are presented, including a push-pull bidirectional actuator. Some results on the control and performances of these devices conclude the paper.
Highlights
Electromagnetic devices have become promising contenders in the area of ultra-high precision manufacturing, manipulation and sensing
This paper reports recent results obtained using a new type of smart material called Magnetic Shape Memory Alloy (MSMA) which is an alloy of Ni-Mn-Ga
In the field of magnetic active materials, the main applications use magnetostrictive materials [7, 8] especially TerfenolD. This material is the most used because of the important progress in its performances since its first use in 1950 by the Naval Ordnance Laboratory in the USA and its high magneto-mechanical coupling compared to the other magnetostrictive materials
Summary
Electromagnetic devices have become promising contenders in the area of ultra-high precision manufacturing, manipulation and sensing Most of these promising new technologies uses active/adaptive materials as a base for actuation principles because of compactness, integrations and smart use capabilities [1, 2]. Its microscopic behaviour is similar to SMAs but strain is due to a martensite/austenite phase transformation but is due to a martensite reorientation under magnetic fields In this second mode of working – martensite rearrangement –, MSMA can be compared with standard magnetostrictive materials but with a much more important magneto-mechanical coupling (6 % of maximal strain for Ni-Mn-Ga instead of 0.16 % for Terfenol-D). Measurements conducted on the prototype will be presented and commented
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