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Shape memory alloy driven retractable small actuator and control circuit thereof

A technology of memory alloy and memory alloy wire, which is applied in the direction of machines/engines, mechanisms for generating mechanical power, mechanical equipment, etc., can solve the problems of large driving force and large stroke, and achieve the effect of large stroke and small volume

Inactive Publication Date: 2009-11-18
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no actuator driven by shape memory alloy with small volume, large stroke, large driving force and saving storage space.

Method used

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  • Shape memory alloy driven retractable small actuator and control circuit thereof
  • Shape memory alloy driven retractable small actuator and control circuit thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] like figure 1 As shown, a shape-memory alloy-driven telescopic micro-actuator includes a fixed end 1, a return spring (not shown in the figure), a shape-memory alloy wire 3, and multiple groups connected by two long rods 4 riveted in the middle. Long rod group, four short rods 2, working end 5,

[0031] At the fixed end 1, one end of the two short rods 2 is connected by a rivet,

[0032] At the working end 5, one ends of the other two short rods 2 are connected by riveting;

[0033] Two sets of long rod groups are connected in pairs to form a long rod member, and the connection mode between two adjacent long rod groups is: one end of the two long rods 4 of one long rod group is riveted to connect with the other long rod respectively. One end of the two long rods 4 of the rod group.

[0034] The two long rods 4 of the long rod group at one end of the long rod member are respectively riveted with the other ends of the two short rods 2 of the fixed end 1 .

[0035] The...

Embodiment 2

[0047] like figure 2 As shown, a control circuit for a shape memory alloy-driven retractable micro-actuator adopts the shape-memory alloy-driven retractable micro-actuator described in Embodiment 1, including a DC power supply 6 , a sliding resistor 7 , and a switch 8 . The DC power supply 6, the sliding resistor 7, the shape memory alloy wire 3 for driving the retractable micro-actuator and the switch 8 are connected in series in sequence.

[0048] Its control principle is as follows:

[0049] The closing and opening of the switch 8 controls the energization and de-energization of the shape memory wire 3, thereby controlling the action of the shape memory alloy to drive the telescopic micro actuator, that is, the telescopic micro actuator is stretched when the switch is closed, and the telescopic micro actuator is stretched when the switch is opened. The retractable micro-actuator shrinks, and when the sliding rheostat 7 slides, the resistance of the circuit is changed, and...

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Abstract

The invention relates to a shape memory alloy driven retractable small actuator and control circuit thereof; wherein the actuator comprises a fixed end, a return spring, a shape memory alloy-wire drawer, a plurality of long member bar groups with two long member bars connected in the middle part by riveting parts, four short member bars, working ends; wherein, at the fixed end, one ends of the two short member bars are connected by riveting parts; at the working ends, one ends of the other two short member bars are also connected by riveting parts; a plurality of long member bar groups form a long member bar component by being connected in pairs; the two ends of the return spring and the shape memory alloy-wire drawer are respectively connected to the two short member bars at the fixed ends and the two long member bars close to the fixed long member bar groups; the control circuit comprises DC electrical sources sequentially connected in series, a slide resistor, the shape memory alloy-wire drawer of the shape memory alloy driven retractable small actuator and the switch thereof. The invention has the characteristics of retractability, small volume, long stroke, large driving force and saving of storage space.

Description

technical field [0001] The invention belongs to the field of micro-electromechanical technology, in particular to a micro-actuator with a telescopic structure driven by a functional material shape memory alloy and a control circuit thereof. Background technique [0002] At present, micro actuators are mostly driven by pneumatic and electric drives. Shape memory alloy is a new type of functional material that integrates sensing, driving and actuators. Shape memory alloy has a memory function and can be made into various shapes such as linear and spiral. It will shrink after being heated, thereby driving the transmission mechanism to realize motion drive the goal of. Its parts have the advantages of simple structure, low cost, and convenient control, so they are widely used to make artificial joints, screws, micro flow valves, pipe joints, micro surgical forceps, etc., and have broad application prospects. [0003] At present, there is no actuator driven by shape memory allo...

Claims

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Application Information

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IPC IPC(8): F03G7/06
Inventor 于莲芝张世雷朱小飞吴洁佘国君
Owner UNIV OF SHANGHAI FOR SCI & TECH
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