TITLE

An Open-Loop Control Approach for Magnetic Shape Memory Actuators Considering Temperature Variations

AUTHOR(S)
Schl├╝ter, Kathrin; Riccardi, Leonardo; Raatz, Annika
PUB. DATE
January 2013
SOURCE
Advances in Science & Technology;2013, Vol. 78, p119
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Magnetic shape memory alloys (MSMA) offer remarkable potentials for actuation purposes because of a large achievable strain and a short response time. But, apart from these advantages, MSMA show a hysteretic behavior between the input and output quantities. Hysteretic phenomena represent an important challenge for the design of control systems for MSMA-based actuators. Furthermore, this hysteretic behavior is sensitive to temperature variations, a situation that arises in many applications. To face the problem of increasing/decreasing temperature during operation, an open-loop control approach considering temperature variations is presented in this paper. For this purpose, an actuator prototype is characterized with particular emphasis on temperature influence concerning the input-output behavior. The presence of a time-varying nonlinearity is addressed by means of a set of hysteresis models and relative compensators to improve the positioning performance of the actuator system. Subsequently, the obtained models are integrated in the control loop and tested experimentally. Finally, the results achieved with the introduced control concept are presented.
ACCESSION #
94083681

 

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