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形状记忆合金(SMA)以其优越特性近年来在工业和医学方面得到广泛应用.SMA电阻随温度的变化可以检测或感知环境温度的变化,根据对应的形状上的变化可执行或完成驱动动作,只要选择好合适的材料,设定好临界动作温度,便可完成设计的传感及驱动功能.作为驱动器,可通过改变环境温度使其动作,也可直接通上直流脉冲电流加热来实现SMA动作,前者称为热驱动器,后者称为电驱动器.用作热驱动器,SMA要比双金属片更好,结构更简单、紧凑,成本更低,
Shape memory alloy (SMA) has been widely used in industry and medicine for its superior characteristics in recent years.SMA resistance can detect or perceive the change of ambient temperature with the change of temperature, according to the corresponding shape change can perform or complete the driving action, Just select the right material, set the critical operating temperature, you can complete the design of the sensing and drive functions as a drive, by changing the ambient temperature to make it act, but also directly through the DC pulse current heating to achieve SMA action , The former is called the hot drive, the latter is called the electric drive.As the hot drive, the SMA is better than the bimetallic strip, the structure is simple, the compact, the cost is lower,