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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/63717

    Title: 形狀記憶合金驅動的對焦致動器之設計;Designing of the focusing device actuated by SMA wire
    Authors: 楊三本;Yang,Shan-Pen
    Contributors: 機械工程研究所碩士在職專班
    Keywords: PWM;形狀記憶合金(SMA);致動器;Actuator;Pulse-width modulation (PWM);Shape memory alloy (SMA)
    Date: 2009-06-22
    Issue Date: 2014-05-08 15:26:54 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本文致力於設計出以線型態形狀記憶合金(SMA)為作動基礎之微型化鏡頭對焦致動器,研究係利用單向鎳鈦(NiTi)形狀記憶合金熱收縮應變的產品特性,設計異於目前小型鏡頭的對焦致動器所常用的音圈馬達(VCM)結構;文中之新型態致動器所使用之線型態形狀記憶合金當被加熱達到合金的沃斯田(Austenite)相變溫度後,合金線的長度會產生固定比率的應變收縮,當合金線的長度因為升溫產生應變收縮時,會推擠致動器內部的楔形塊傳動結構,透過形狀記憶合金線在高、低溫的相變過程中所產生的合金收縮與放鬆達成致動器系統的往復直線運動。
    ;The thesis discusses and evaluates a model of miniature lens actuating system that incorporates wire-type shape memory alloy (SMA) as actuator.
    Nickel-titanium (NiTi) SMA "remembers" and returns its original shapes after deformed by applying heat to the alloy. The one-way memory effect of NiTi SMA wire is utilized to study the feasibility of replacing conventional actuators like voice coil motor, stepping motor, and Piezoelectric motor.
    The thesis starts from offline NiTi SMA wire (0.1mm) characteristics study. This SMA wire deforms and changes its length during temperature/stress change. This is known to transition from the martensite phase to the austenite phase, or the reverse.
    Thereafter same SMA wire is incorporated into a 34.0mm×34.0mm×10.8mm real wedge actuating system to discuss additional factors in designing real word system.
    This system utilizes length change of SMA wire to actuate wedge mechanism for lens movement. Also an IC555 controller is used to output pulse-width modulation (PWM) signal for smooth current control.
    Finally a miniature 8.5mmx8.5mmx2.7mm system is characterized utilized observation obtained.
    Appears in Collections:[機械工程學系碩士在職專班 ] 博碩士論文

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