- 學位論文
矽鋼片之鐵損值與應力關係之研究
A Study of the Relationship between the Iron Loss of Silicon Steel Sheet and Applied Stresses
摘要
自從馬達發明以來，馬達已成為人類生活中不可或缺之工具，但也帶來相當程度之能源耗損。近年來環保意識的抬頭，如何降低馬達之耗能、提升馬達之效率已經成為節能減碳之重要課題。在馬達運作之時，鐵損佔據了馬達耗能的極大部分，其中業界與學術界猜測可能影響鐵損之因素之一即為殘留應力，殘留應力為物體在塑性加工完成而外力釋放後，為達到力平衡而存在於物體內的應力。因此，需先針對應力與鐵損間之關聯性進行探討，方可確認殘留應力對於鐵損之影響性。 本論文之目的為研究應力與鐵損之關聯性，欲探討應力影響鐵損之程度，進而歸納出不同種類之應力對於鐵損之影響，也因此必需研發相關之鐵損實驗夾治具以確保實驗數據之正確性。本論文先利用實驗儀器量測不同應力下之矽鋼片鐵損大小，以期了解應力與鐵損之絕對或間接之關連性和影響性。實驗結果顯示應力影響鐵損非常顯著，本論文因此進而建立矽鋼片沖切之CAE分析模型，並利用此模型進行各種沖切成形參數對於矽鋼片產生殘留應力分布之探討，藉以找出沖切成形製程影響應力分布之關鍵參數，作以調整應力種類與大小之操作變因。最後，藉由以上之研究成果希能建立沖切參數→應力→鐵損之關聯性。
並列摘要
Since the invention of motor is rising, motor has become the indispensable tool in daily life of human beings. However, it leads to consume energy tremendously. With the rising awareness of environment protection, how to reduce the energy consumption of motor and upgrade the efficiency of motor are the critical issues we need to concern. When motor is operating, iron loss possesses most part of energy consumption, and the major factor that affects iron loss may be the residual stress existing in the motor silicon steel sheets. Residual stress produced in the steel sheets is generally due to the steel sheet being machined or deformed plastically. Therefore, we need to first confirm the relevance of stress and iron loss, and then we can next check if residual stress has certain impact on iron loss. The purpose of this study is to examine the relationship of stress and iron loss, and generalize the influences of different stress components on iron loss. Thus it needs to design the appropriate experimental fixtures in order to provide right functions for obtaining the experimental data required. In this thesis, novel experimental fixtures were developed to measure the iron loss of silicon steel sheets under different stress components, including uniaxial tension, uniaxial compression and simple shear, so as to comprehend direct or indirect relationship between stress and iron loss. The experimental results reveal that the shear stress affects iron loss significantly. Since the major source of the residual stresses produced in motor silicon steel sheet results from the precedent punching process, this study also established the finite element analysis model to simulate the punching process of silicon steel sheet. The simulation results were used to investigate the influences of the punching process parameters on the residual stress produced. The critical punching process parameters that affect the distribution of residual stress significantly were determined, and the appropriate punching process parameters that could result less iron loss in silicon steel sheets were proposed in this thesis. The research results achieved in this thesis could provide valuable information on establishing the relationship among the punching process parameters, residual stress, and iron loss.
參考文獻
延伸閱讀
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