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Title: | 以雙頻雙模態激發之二維傳遞波產生器開發及在二維壓電馬達之應用 Development of a two-dimensional traveling wave generator driven by Two-frequency-two-mode excitation ― A new driving method for two-dimensional piezoelectric motor |
Authors: | Yu-Min Lin 林育民 |
Advisor: | 李世光(Chih-Kung Lee),吳文中(Wen-Jong Wu),許聿翔(Yu-Hsiang Hsu) |
Keyword: | 雙頻雙模態,壓電馬達,壓電材料,行進波, two-frequency-two-mode,piezoelectric motor,piezoelectric material,traveling wave, |
Publication Year : | 2019 |
Degree: | 碩士 |
Abstract: | 本研究宗旨在於一有限結構上設計並製作出二維壓電線性馬達,透過在壓電串聯雙晶片上設計四個壓電致動區域,其中兩個致動區域用來驅動產生x方向的行進波,另外兩個致動器區域用來驅動產生y方向的行進波。為了能成功地在有限結構中產生穩定且可控制方向的行進波,本研究的設計原理為將過去雙頻雙模態概念進行修改,以往對於雙頻雙模態定義為分別對兩致動器驅以選定的兩共振頻來激發兩共振模態進行疊合,並產生行進波。然而,由於兩共振頻不具有整數的倍數關係,其相位差是隨著時間在變化的,必然會產生往復的行進波,而造成推動物體移動的效率不理想。本研究以此為基礎,將兩輸入頻率以接近兩共振頻並具有整數倍之關係,引入多倍角的概念來進行設計,使其能產生出兩共振模態且具有固定相位差來控制行進波的走向。
為了使兩致動器輸出模態的單一化而不會產生鄰近模態而受影響,本研究設計與電極位置使得鄰近模態貢獻可在空間中消除或降低。除此之外,為了產生穩定的行進波,本研究也分析輸入的兩訊號的時間域相位差及電壓比。本研究透過理論推導、數值模擬,有限元素分析,找出行進波驅動的最佳化參數並透過實驗結果驗證理論與模擬正確性,最後透過不同荷重的實驗。由實驗驗證所開發之二維壓電線性馬達對0.43g(36mm2)載物的x方向移動速度最高可達8.5mm/s,對0.33g(9mm2)載物y方向移動速度最高可達8.2mm/s,而最高載物重量在x方向可達0.43g,而y方向可達0.33g,驗證此二維壓電馬達之驅動效能。 In this theis, the method to design and fabricate a two-dimensional piezoelectric linear motor on a finite structure is developed. The main structure was a piezoelectric serial bimorph, and four different driving electrodes designed on one of the bimorph surface for generating traveling waves. Two piezoelectric actuators were used to drive y-direction traveling wave. The other two actuators were used to drive y-direction traveling wave. In order to successfully generate a stable and controllable traveling wave on a finite structure, this research developed a new two-frequency-two-mode excited method. Two bending modes were used to activate with two input frequencies that were close to each other. The driving amplitudes were used to optimize the driving performance. In order to minimize the influence of resonant modes that should not be excited, the location and geometry of these electrodes were designed to minimize interference. In addition, this study also analyzed phase difference and voltage ratio of two input signals to generate a stable traveling wave in both x and y directions. In conclusion, this research provided the optimal parameters of the traveling wave by theoretical derivation, numerical simulation and finite element analysis. It is also experimentally verified that the moving speed of a 0.43g object can reach 8.5mm/s in x-direction and the moving speed of a 0.33g object can reach 8.2mm/s in y-direction. The highest weight that this motor can carry is 0.43g in x-direction and 0.33g in y direction. These experimental findings verified the performance of the two-dimensional piezoelectric linear motor. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73743 |
DOI: | 10.6342/NTU201903905 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 工程科學及海洋工程學系 |
Files in This Item:
File | Size | Format | |
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ntu-108-1.pdf Restricted Access | 6.39 MB | Adobe PDF |
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