Development of magnetic drive actuator by using ferromagnetic shape memory alloy composite

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The magnetic driving torque actuator that have the high load ability and the large deformation capability was developed by using the ferromagnetic shape memory alloy composite composed of the superelastic shape memory alloy and the ferromagnetic material. The calculation methods of the geometry of the superelastic shape memory alloy wire and the rotation angle for the applied magnetic field were proposed. The prototype of torque actuator was made on the basis of the calculation. Consequently, large angle of rotation was able to be obtained by applying the magnetic field in high torque region although the angle of rotation was about 30% of the theoretical value.