形状記憶合金アクチュエータの動特性の改善

概要

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An actuator using shape memory alloy (SMA) has large power/weight ratio and is able to generate relatively. Iarge displacement. However there 'are only few examples of practical applicication in precision engineering because its dynamic characteristics are vervy poor. An SMA actuator deforms by being heated up and cooled down with deforming force, It is usually easy to heat up fast, but difficult to cool down quickly since the cooling time depends on the amount of heat flow from inside to outside of SMA. So dy namic response of the actuator mainly depends on the time to cool down. In order to improve the dynamic characteristics of the SMA actuator, the present paper proposes to put the actuator in water bath for cooling down actuator quickly. The effect of setting the SMA in water bath is experimentally examined. Responses of linear actuators of SMA wires set in air and/or water are compared with each other. For miniaturization, water .jackets should be small. However if they are small, cooling abilitv. becomes poor and temperature of water in the jacket rises up fast by repetitive drive. Therefore influences of size of the jackets. cycle time of repetitive drive and water temperature in the jacket are investi gated.
公益社団法人精密工学会の論文
1999-01-05