Investigation into the Finite Element Modeling and Dynamic Characteristics of the Assembly of Spindle and Motor Rotor

內藏式主軸與馬達轉子裝配的有限元素建模與動態特性之探討

陳明飛(Ming-Fei Chen) ； 黃韋倫(Wei-Lun Huang)

《中國機械工程學刊》 32卷3期 (2011/06) Pp. 257-266

https://doi.org/10.29979/JCSME.201106.0009

摘要

內藏式主軸是高速工具機的核心部件，內藏式主軸的旋轉軸是由馬達轉子裝配於心軸上所構成，馬達轉子與心軸的配合特性是影響內藏式主軸動態特性的重要因素。在分析內藏式主軸的動態特性時，有限元素法為一重要的計算方法。然而，由於心軸與馬達轉子的結合機制相當複雜，使得有限元素的計算結果與模態測試結果常會有所誤差，此誤差乃由於有限元素模型與實際系統的差異所致。因此，本文以轉子動力學為基礎，提出一種馬達轉子－心軸之有限元素模型建模方法，並透過模態測試與最佳化方法修正有限元素模型。由研究結果顯示，此種建模的方法是精確有效的。此外，本文利用不同內徑尺寸的馬達轉子熱配於相同尺寸的心軸上，然後以模態測試與有限元素分析的方法，得到馬達轉子－心軸在不同裝配公差（如：干涉配合、間隙配合）下所造成的動態特性變化，研究結果可作為馬達轉子－心軸在裝配時公差設計的參考。

並列摘要

The electro-spindle is a core component of a high-speed machine tool, and motor-rotor mounted on shaft is an important factor which influences the dynamic characteristics of the electro-spindle. When the dynamic characteristics of the electro-spindle are analyzed, the finite element method is an important computation method. However, owing that fitting the spindle shaft with the motor-rotor is considerably complicated, there are often errors between the computational result of the finite element method and the result of modal testing. Such errors result from the differences between the finite element model and the actual system. In the present paper based on rotor dynamics proposes a finite element modeling method for the motor-rotor shaft, and then adjusts the finite element model by means of modal testing and optimization methods. The research results indicate that this modeling method is accurate and efficient. Besides, in the present paper, motor-rotors of different inner diameters are mounted onto shafts of the same size, and then modal testing and a finite element analysis are applied to obtain the dynamic characteristics of the motor-rotor shaft under different assembly tolerances. The research results can be used as a reference for the tolerance design of the motor-rotor shaft assembly.

並列關鍵字

electro-spindle ； motor-rotor ； finite element method ； modal testing ； assembly