增量式量測系統參考標記之研發

Development of Precision Index Mark from Incremental Measuring system

蕭恆昇(Heng-Sheng Hsiao)

指導教授 ： 張禎元

國立清華大學/工學院/動力機械工程學系/碩士(2014年)

摘要

有別於一般電磁鐵式寫入方法，本論文採用一種較不廣為人使用的永久磁鐵寫入法，在增量式量測系統上製作高附加價值的參考標記。磁性量測系統由於材料取得容易、價格相對低廉、又可在較嚴苛的環境中使用，且應用層面與光學量測系統相似，因此近些年來的發展逐漸受到重視，但受限於現有技術，目前磁性量測系統的精度與解析度仍無法與中高階的光學編碼器相提並論，而其中對磁性量測系統定位精度影響較甚的便是編碼的製作品質。
本研究由理論出發、研擬可行之製程方式，對整體量測平臺進行設計，透過模擬分析與實驗驗證來實現參考標記的製作，其中量測平臺的設計包含元件的選用、尺寸外形設計、控制方法等。為了實現參考標記，參考標記製作方式的選定後，必須針對寫頭外形作設計，並分析最佳磁化參數，以得到較佳的製作品質，此外，我們將對製作完成之量測系統進行實際測試，如場形分佈、位置精度誤差、重現精度誤差等， 在本研究最後的部分，將針對以本研究方法製作的含參考標記之量測系統，進行可靠度試驗的分析，以作為評斷其實際應用上性能表現的參考依據。未來期望此方法能持續不斷的改善，提升量測系統的製造品質，並往更高階的量測系統繼續發展，以應用於工具機或機器人之位置控制。

關鍵字

量測系統 ； 參考標記 ； 永磁磁化法

並列摘要

Different from the commercial usage of electromagnet for manufacturing process, this paper utilized a permanent magnet for manufacturing process to develop index mark on an incremental measuring system. Magnetic encoders have been gradually emphasized in recent years due to its advantage of affordable price and ability to withstand and operate in harsh environment. Also, magnetic encoders have similar application as that of optical encoders. However, the accuracy and resolution of current magnet encoders are not able to compete with the mid or high level performance of optical encoders. The quality of manufacturing process is crucial in influencing the positioning accuracy of magnetic encoders.

This study first used theoretical approach to investigate different manufacturing methods. For the design of measuring platform, simulated and experimental results were used to confirm the feasibility of index mark. The design of measuring platform included the choice of materials, dimensions, and methods of system control. After the manufacturing method is finalized, the shape of the write head needs to design and analyze in order to optimize the quality of manufacturing process. In addition, measuring system was put into test to evaluate the magnetic flux distribution, positioning accuracy, and repeatable accuracy. Finally, reliability analysis was carried out on the sample to examine the performance of index mark on measuring system.

In the near future, the measuring system is expected to improve in order to enhance manufacturing quality and advance to higher level of measuring system development. These improvements will play an important role in the application of machinery and robotic positioning control.

並列關鍵字

Measuring system ； Index mark ； Permanent magnet for manufacturing process

參考文獻

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