形状記憶合金アクチュエータの位置・荷重制御システムの開発

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  • Development of Position and Load Control System for Shape Memory Alloy Actuator

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<p>This study developed the position/load control system of shape memory alloy (SMA) actuator with electrical resistance feedback which can prevent the overload of the SMA wire by the restriction of the SMA actuator. The SMA wire used in this study is Ti-Ni-Cu alloy with 0.15mm diameter. The variation of measured resistance value and the applied stress after the restriction of the SMA actuator was investigated. The large resistance deviation between the setting resistance value and the measured resistance value occurred by the restriction of the SMA actuator and the applied stress larger than the allowable stress of 165 MPa also occurred. Hence, this study developed the newly position control program which adjusts the setting resistance value automatically so that the resistance deviation do not exceed the limiting resistance deviation. In case of the limiting resistance deviation of 25 mΩ, the applied stress was 133 MPa less than the allowable stress of 165 MPa. Namely, the newly developed position control program could prevent the overload of the SMA wire`. Furthermore, the relationship between the limiting resistance deviation and the applied stress was investigated. There was the linear relation between the limiting resistance deviation and the applied stress. Therefore, the newly developed position control program can control position and load without using position and load sensors.</p>

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