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    SMA actuator safety mechanism
    1.
    发明授权
    SMA actuator safety mechanism 失效
    SMA执行机构安全机制

    公开(公告)号：US06928812B2

    公开(公告)日：2005-08-16

    申请号：US10632170

    申请日：2003-07-30

    申请人： William J. Donakowski ,  Mark A. Gummin ,  Geoffrey Gaines

    发明人： William J. Donakowski ,  Mark A. Gummin ,  Geoffrey Gaines

    IPC分类号： F03G7/06 ,  F01B29/10

    CPC分类号： F03G7/065

    摘要： A method and apparatus for preventing the unintended activation of SMA devices by ambient temperatures that exceed the phase transition temperature of the SMA material itself. In one embodiment a passive actuator is coupled to an active actuator, each having identical arrangements of SMA wire, but connected in opposite directions to compensate for temperature drift that is not due to powered heating. A second embodiment consists of a passive SMA wire connected to a latch/release mechanism allowing the actuator itself to move rather than moving the load. In a third embodiment the passive wire is connected to a load coupling, so that the load itself is disconnected from the actuator when the passive wire reaches the phase transition temperature. The passive wire may be made of a lower-temperature wire than the active wires, so that the release action occurs long before the active wire begins to be moved by ambient temperature.

    摘要翻译： 一种用于通过超过SMA材料本身的相变温度的环境温度来防止SMA器件意外激活的方法和装置。 在一个实施例中，无源致动器耦合到主动致动器，每个主动致动器具有相同的SMA线排列，但是以相反方向连接以补偿不是由于加热加热引起的温度漂移。 第二实施例包括连接到闩锁/释放机构的被动SMA线，允许致动器本身移动而不是移动负载。 在第三实施例中，无源线连接到负载耦合，使得当无源线达到相变温度时，负载本身与致动器断开连接。 无源线可以由比有源线更低温的导线制成，使得释放动作在有源线开始被环境温度移动之前很长时间发生。