A Composite Actuator Based on Shape Memory Alloy

Abstract

The invention discloses a compound driver based on shape memory alloy. The compound driver includes a central core, a cooling layer covering the surface of the central core and a conductive layer covering the surface of the cooling layer; the material of the central core is shape memory alloy; the material of the cooling layer is electric card material. The center core of the present invention adopts a shape memory alloy, and the outer surface of the center core is coated with an electric card material as a cooling layer. By using the temperature-sensitive characteristic of the shape memory alloy, the electric card material generates heat absorption by applying and canceling an electric field to the electric card material. and exothermic process, so that the electric card material heats and cools the shape memory alloy, so that the shape memory alloy completes the reverse phase transition and phase transition process, so as to achieve the purpose of driving. It has fast cooling speed, simple structure, low cost, and Size is unlimited.

Description

technical field [0001] The invention relates to the technical field of actuators, in particular to a composite actuator based on shape memory alloys. Background technique [0002] Smart structure is a structural system with intelligent materials as the leading material, with life-like feeling and self-regulating function. Smart materials are materials with special functions, such as piezoelectric materials, optical fibers, electromagnetic rheological fluids, shape memory materials, magnetostrictive materials, and intelligent polymer materials. In recent years, shape memory alloy (ShapeMemoryAlloys, SMA), as a new type of smart material, with its unique shape memory effect (Shape MemoryEffect, SME), superelastic effect (SuperElascic Effect, SEE), excellent physical and chemical properties and biocompatibility , It is widely used in engineering, control, medical, energy and machinery and other fields. [0003] As a new type of functional material, shape memory alloy has been...

AI Technical Summary

Problems solved by technology

[0005] However, at present, the biggest defect of all kinds of shape memory alloy drivers is the cooling problem. Although the reverse phase transformation process can be completed within a few seconds through the pulse width current, it takes tens of seconds to complete the phase transformation process. process, the cooling time is long, which greatly limits the application fields of shape memory alloys

Although the cooling can be accelerated by adding cooling devices, such as air-cooling, air-cooling or water-cooling devices, etc., it still takes a long time, and it also increases the volume and quality of the entire device, making the driver unable to be used in a limited driving space. , which also increases the cost of the overall device

Images