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26 July 2004 Design of FSMA spring actuators
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A new spring actuator composing of two parts: driving unit and ferromagnetic shape memory alloy (FSMA) spring, is designed based on hybrid actuation mechanism. The driving unit, which is based on hybrid magnet, consists of coil, yoke, and ring shape permanent magnet (PM); the FSMA spring can be either composite material, which is made of shape memory alloy of superelastic grade, and soft ferromagnetic material, or FSMAs such as FePd. In this design, driving units are inserted in between ferromagnetic springs. This will provide the actuator with larger force and stroke. FEM analysis under axis symmetric model has been used to optimize the driving components. According to the numerical results, the iron blocks, both on the top and the bottom, can provide larger magnetic forces facing downwards and upwards respectively due to the gradient of magnetic flux density. Advantages of this design are simple, robust, and compact yet providing relatively large force (20N) and stroke (30mm).
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Hsiu-hung Chen and Minoru Taya "Design of FSMA spring actuators", Proc. SPIE 5390, Smart Structures and Materials 2004: Smart Structures and Integrated Systems, (26 July 2004);

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