如今，轉子真空幫浦在許多工業領域中廣泛被使用，像是汽車、製藥、食品、化學 等。真空幫浦最重要的部分即是轉子本身，其主要的問題在於轉子不平衡性。目前許 多研究正在開發變導程螺桿轉子，因為它們具有提升真空幫浦性能的優點。然而，這 將會增加轉子動不平衡，這就是為什麼需要設計轉子動平衡來維持真空幫浦的性能和 使用壽命。在前期研究的基礎上，本研究旨在透過兩種不同的方法來確定變導程螺桿 轉子的動平衡。第一種方法是將現有轉子虛擬地分成若干段，並確定每段的質量和質 心以用於轉子不平衡計算。之後，根據不平衡計算的結果，確定需要去除之質量塊形 狀、質量和位置。第二種方法涉及一種具有三個不同線段的變導程曲線模型，透過參 數化變導程曲線，使轉子消除慣性矩並達到動平衡條件。本研究提出之兩種動平衡方 法，皆利用最佳化模組 Global Optimization Tools 進行求解，並可以快速地計算出最佳 結果。根據結果顯示，本研究提出之兩種動平衡方法能夠使剛性轉子之動平衡標準達 到 ISO-1940，並且可以應用在不同輪廓和形狀的變導程螺桿轉子上。 ;Nowadays, many industries such as automotive, pharmaceutical, food, and chemical have applied vacuum pumps with screw rotors. The most important part of a vacuum pump is the rotor itself. The main problem with a rotating rotor is that it is unbalanced. Current researches are developing screw rotors with variable pitch because of their advantage in improving rotor efficiencies. However, it will increase the dynamic unbalance of the rotor. That is why dynamic balance is needed to maintain the pump′s performance and service life. Based on previous research, this study purposed to determine the dynamic balancing method on variable pitch screw rotors with two different methods. The first method is to divide the existing rotor into several segments virtually to define the mass and centroid of each segment. It can be used for the unbalance calculation. After that, the results of the unbalanced calculation are used to determine the cavity shape, mass, and position. The second method involves a variable pitch curve model with three different segments to remove the inertia moment and achieve dynamic balance conditions. Global Optimization Tools were used to get both proposed methods′ best results and time efficiently. Both proposed methods can achieve the balanced rigid rotor standard ISO-1940, and it is possible to implement these methods on screw rotor variable pitch with different rotor profiles and shapes.
