Spring-based actuators
Spring-based actuators
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基于弹簧的执行器
DOI：
10.1117/12.474986
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
M. Taya
中科院分区：
文献类型：
--
作者：
Taishi Wada;M. Taya
提出了一种基于铁磁形状记忆合金(FSMA)的弹簧驱动器的新概念。由FSMA制成的螺旋弹簧是由电磁铁产生的吸引磁力激活的，这种磁力通常是不均匀的。当施加磁场时，弹簧的每一圈都会逐个与相邻的圈接触，从圈开始堆叠到更接近电磁铁的线圈。结果，实现了弹簧的整体收缩，并伴随着较大的衬垫行程。这种执行机构是节能的，因为几乎所有的磁通都来自于进入铁磁弹簧的电磁放电。弹簧执行器的性能，即输出力和行程，取决于许多因素，如弹簧的直径和节距或弹簧钢丝的横截面尺寸等。基于上述原理，我们利用多晶FEPD合金成功地加工出了混合型磁体驱动的弹簧驱动器。由于马氏体相变使FEPD螺旋弹簧的刚度变软，在驱动过程中加速了执行器的运动。
A new concept of a spring actuator based on the ferromagnetic shape memory alloy (FSMA) is presented. The coil spring made by a FSMA is activated by the attractive magnetic force produced by electromagnets, which is usually not uniform. When the magnetic field is applied, each turn of the spring comes into contact with the neighboring turns one by one, stacking from the turn closer to the yoke of the electromagnet. As a result, entire shrinkage of the spring accompanied by large liner stroke is achieved. This actuator is energy-efficient, since almost all magnet flux originated from electromagnet discharges into the ferromagnetic spring. The performance of the spring actuator, i.e. the output force and stroke, depends on many factors, such as the diameter and the pitch of the spring or the dimension of the cross section of the spring wire, and so on. We processed successfully a spring actuator driven by a hybrid magnet based on the above principle by using polycrystalline FePd alloy. Since the stiffness of the FePd coil spring become softer due to the martensite phase transformation, the movement of the actuator is accelerated during actuation.