Abstract
This paper presents a precise position actuator based on Magnetic Shape Memory (MSM) alloys. This new type of material has a remarkable potential in many areas of mechatronics due to its outstanding magnetically-induced strain, which is significantly larger than the one exhibited by other common active materials such as piezoelectric ceramics. Nevertheless, MSM alloys still have not found their way into industrial applications mainly due to their high hysteretic behavior and the strong sensitivity to temperature changes. After introducing the main characteristics of the prototype of precise positioning system based on an MSM alloy, this paper considers the problem of effectively controlling the device in closed-loop. Three different control strategies are compared in a wide range of operating conditions, including experiments with abrupt temperature changes. Experiments confirm that the undesirable effects of temperature on the precision of the device can be partially addressed with an adaptive model-based algorithm devised to cope with time-varying nonlinearities.
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