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| 題名: | 應用巨磁阻效應設計一創新性非接觸式感測器
Design and Application of a Novel Contactless Sensor by GMR effect |
| 作者: | 謝明哲 |
| 貢獻者: | 電機工程研究所 |
| 關鍵詞: | 巨磁阻效應
非接觸式感測器
撓性磁帶
多功能 |
| 日期: | 2012-07
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| 上傳時間: | 2013-11-18T08:52:10Z
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| 摘要: | 本論文主要突破過去工業用非接觸式感測元件主要透過磁場磁通量感應及光學接收技術的瓶頸，利用廣泛運用在高容量硬碟機內的巨磁阻效應，並結合撓性磁帶、TI公司的CC2530F256中央處理晶片，所設計出一創新性非接觸式感測器，其主要的優點有：(1)運用巨磁阻效應，取代傳統磁場磁通量感應或光學接收技術，(2)其量測輸出訊號同步於外部磁場變化，訊號反應靈敏度高及系統響應頻寬不受影響，(3)不易受外界電子雜訊或溫度變化影響而產生誤判，(4)相對於傳統感測元件(如光學轉速計)只適合量測轉速單一功能，本感測器除了可量測轉速外，亦可量測平移速度及自動化診斷等多功能，並兼具有結構簡單、低成本、可攜性及彈性安裝等特性，未來可達到易安裝、即貼即量、低功耗、不佔空間、可攜性、抗雜訊、彈性應用範圍廣、準確性高及可靠度高等優點，極具商業化及量產應用潛力。本論文進一步設計一高精密移動驗證實驗平台，內建台達電交流伺服馬達，並應用Borland C++ Builder軟體設計人機介面視窗，透過外部控制伺服馬達驅動器的馬達轉轉速，可以對伺服馬達做速度設定與監控，再與透過巨磁阻感測器量測值做驗證。
The thesis presents a novel design of the contactless sensor by the giant magnetoresistance (GMR) effect, instead of the traditional Hall effect or optical technology. The contactless sensing device comprises a magnetic stripe fixed on a tested object, a GMR detector and a TI CC2530F256 processor. The magnetic stripe has arranged plurality of N-pole and S-pole blocks. While the object is moving to make the magnetic stripe pass through the GMR detector, the magnetic direction of the free magnetic layer is influenced by the N-pole and S-pole blocks, such that the magnetic direction of the free magnetic layer is parallel or anti-parallel to the fixed magnetic layer. The induced change of the magnetoresistance(GMR) results in the obvious change of the output signal to the processor, and then the information of the tested object is calculated. The advantages of the contactless sensor are demonstrated in the thesis, such as: (1)GMR effect is firstly applied to the sensor design, with the advantages of simple structure, easy installation, low power consumption, low cost, portability, and flexible installing function. (2)The output signal, with high sensitivity, noise immunity and bandwidth, is synchronous with external magnetic field change. (3)Compared with traditional contactless sensor, e.g. optical tachometers, which is only applicable to measure RPM, the sensor is multifunctional to detect not only the position, but also RPM, translational speed and abnormal information. At last, a high-precision motion control of a test platform is designed by Delta servo-motor and Borland C++ Builder software. The experimental output data detected by GMR effect is implemented and verified by the actual data from servo-motor. |
| 描述: | 指導教授:許耿禎 |
| 顯示於類別: | [電機工程系(含碩士班)] 學位論文
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