脈寬調變(PWM)對電磁鋼片電磁特性之影響

Effect of Pulse-Width Modulation on the Electromagnetic Characteristics of Electrical Steels

郭開誠(Kai-Chen Kuo)

指導教授 ： 顏家鈺

國立臺灣大學/工學院/機械工程學研究所/博士(2011年)

https://doi.org/10.6342/NTU.2011.10928

摘要

本研究已成功開發出一種「標準化環型測試器」，與原Epstein方法比較，在於大幅減小待測試片的尺寸，且毋須選取特定方向的試片，同時並且無試片需交互堆疊的情形。此外亦解決以漆包線繞環型試片時，不易標準化的情形。在測試機構的電路設計方面，除傳統的類比正弦波訊號外，亦新增設計了脈寬調變(PWM)的數位訊號電路，以利於評估電磁鋼片使用於高效率及易控制轉速之馬達電路。
本研究實際測試時，試樣選取兩種厚度、高低磁通密度及不同製造源計八種試片組合，然後進行傳統Epstein及新型環型之測試。測試時亦分別以傳統類比正弦波訊號及脈寬調變(PWM)數位訊號輸入，以得出各種電磁特性測試數據，供作與材料冶金性質之比較分析。測試結果顯示此測試機構具有高的鑑別度，已能驗證因材料之冶金性質(如組織結構)之差異，與PWM訊號輸入之電磁特性具有相關性。
經由精確的評估電磁特性，本研究成果使電磁鋼片更能發揮其電磁特性，讓馬達效率更好，適材適用，節省電量，更可減少碳的排放，達到節能環保的目的。

關鍵字

電磁鋼片 ； 矽鋼片 ； 環型 ； 鐵損 ； 脈寬調變 ； 組織結構

並列摘要

This thesis reveals that a new “standardized ring type tester” has been successfully developed. Comparing to the traditional Epstein method, the test pieces can be significantly minimized without special requirements of direction and don’t need to be piled up with the new tester. Besides, it also helps to standardize the process of winding toroid with magnetic wire. For the electric circuit on test mechanism, a Pulse-Width Modulation (PWM) digital signal was designed in addition to the traditional analogy sine wave signal so as to evaluate the electrical steel being applied to high efficient and easily-controlled motor circuit.
In this study, 8 test specimen with two thicknesses, various flux densities and different makers were selected for both the traditional Epstein method and new toroid test, respectively. During the tests, both the traditional analogy sine wave and PWM digital signal were input to obtain various data of electro-magnetic properties for comparative analysis. The test result shows that this mechanism has a high identification. It can also prove the variation of the metallurgical properties of materials, like textures, and the relationship of the electro-magnetic properties of PWM signal input.
By means of a precise evaluation of electro-magnetic properties, this study found that the electrical steel can cause motors more efficient, and also meet the requirements of environmental protection by saving energy and reducing carbon emission.

並列關鍵字

Electrical Steel ； Silicon Steel ； Epstein ； Toroid ； Iron loss ； PWM ； Texture

參考文獻

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