- 學位論文
徑向被動磁浮軸承於滾珠軸承支撐之轉子系統應用
Applications of Radial Passive Magnetic Bearings in Ball Bearing-Rotor System
摘要
因為磁浮系統無磨損之問題，使得磁浮系統在工業系統相關應用越來越廣泛。而磁浮系統又可分為被動式磁浮系統與主動式磁浮系統，其差別為主動式磁浮系統是使用電磁鐵，藉由控制電流大小來調整磁力之大小，其優點是可以隨著迴授訊號控制所需之磁力增加穩定性，但缺點為需要額外的控制系統與額外功率消耗，並且有一定的侷限性；被動式磁浮系統則是使用永久磁鐵，其優點就是侷限性較小，但缺點就是其磁力無法控制，需要預先算好所需磁力，無法任意改變其磁力。 本研究結合被動式磁浮軸承與滾珠軸承而成為一混合式支撐系統。利用被動式磁浮軸承無磨擦之特性，來提昇軸承的徑向負荷，減輕滾珠軸承負載以增加軸承壽命。使用被動式磁浮系統是因不其需額外控制系統且可用環境限制也比較小，而且成本也低於主動式磁浮軸承系統。目前應用最廣之滾珠軸承為深溝滾珠軸承，本研究即挑選一組內徑10mm外徑19mm厚度5mm之深溝滾珠軸承來做試驗，由於軸承壽命較有限，延長壽命之效果較為明顯。實驗證明本研究之設計可有效延長滾珠軸承之壽命。 時首先針對軸承的負載進行徑向力分析及軸向力計算，以確定系統規格及承載力，藉此決定軸承的設計規格。根據永久磁鐵之推導公式設計被動式磁浮軸承，搭配JMAG分析本實驗設計之磁浮軸承系統，分析被動式磁浮軸承設計對徑向承載力及剛性的影響以及最小軸向力，最後以永久磁鐵產生相對應之磁力進行實驗，並與模擬之結果互相驗證。
並列摘要
Nowadays, magnetic systems have been applied in the industry systems widely due to the frictionless property of magnetic systems. Magnetic systems have two kinds: passive and active magnetic systems. Active magnetic systems use electronic magnet to control the subjects, such as rotors or platforms, by controlling the current to adjust the size of magnetic force. The advantage is the system stability can be confirm via tuning the magnetic force by the feedback signals, but the disadvantage is the magnetic system need additional control system and will consume the power. Passive magnetic systems use the permanent magnets to produce magnetic force. The advantage is it can be used a widely range, but the disadvantage is its magnetic force can’t be controlled, need to calculate the magnetic force. A passive magnetic bearing and a ball bearing are combined to form a hybrid bearing system in this paper. The passive magnetic bearing is used to increase the maximum radial load capacity and reduce the ball bearing load then promote the bearing life. The reasons we chosen a passive magnetic bearing are that the passive magnetic bearing system has no friction, does not need additional control, widely using environment and cheaper than the active magnetic bearing. The coordinate ball bearing is a deep groove ball bearing. The deep groove ball bearings are one of the most widely used ball bearings. Because the load capacity and life of the ball bearing are both lower than the steel ball bearing. This paper used a deep groove ball bearing with the inner radius is 10mm, the outer radius is 19mm, and the thickness is 10mm to be a test bearing. The experiment result showed that the proposed hybrid bearing can promote the bearing life. First, we calculated the radial force and axial force for the supporting system to determine the system specifications and capacity and the need of the supporting system. Then analyzed the relationship of forces and positions of the passive magnetic bearing according to the formula of the permanent magnet and to simulate the magnetic circuit with JMAG to choose a suitable set of permanent magnets to form a result with maximum radial force and minimum axial force. Finally, the passive magnetic bearing and the deep groove ball bearing are combined to test and confirm with the simulation results.
參考文獻
延伸閱讀
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