Design and Development of Hybrid Magnetic-Aerostatic Bearing and Performance Investigation
Date Issued
2006
Date
2006
Author(s)
Chen, Yi-Ta
DOI
zh-TW
Abstract
The aim of the thesis is to design and develop a micro aerostatic-magnetic hybrid bearing. The aerostatic bearing provides the main function to supply supporting force to the rotating shaft, and the magnetic levitation principle is applied to stabilize the operational condition of aerostatic bearing. For achieving high load capacity and stability, the sleeve type shaft is developed for the aerostatic bearing; the two NdFeB magnets are used in the magnetic device to produce the axial pre-load on the aerostatic bearing for realizing a stable and optimal air gap. Besides the combination of the aerostatic and the magnetic principles, a short-shaft bearing and a long-shaft bearing are designed and developed to study the influences of the geometric sizes and the structural arrangement on the performance. For generating high speed spindle’s rotation, an air turbine driven by the high pressured air jet is developed and integrated with the hybrid bearing.
The Reynold’s equation is derived and modified to analyze the influences of the design and operational parameters of the aerostatic bearing on the load capacity and the stiffness. Furthermore, the 3-D finite element software FLUENT is utilized to investigate the detailed influential effects of the design parameters. For developing and optimizing the magnetic device, the magnetic-circuit method and the Maxwell electromagnetic simulation software are used to analyze the influences of the arrangement and the geometric dimensions of the magnets on the magnetic pre-load. The main testing items for the hybrid bearing are load capacity, stiffness, vibration and rotating speed, which are measured to verify the effects of the influential parameters.
Subjects
氣靜壓軸承
磁浮裝置
混合式
氣渦輪
預力
承載力
剛性
振動
轉速
aerostatic bearing
magnetic device
hybrid
air turbine
pre-load
load
stiffness
vibration
rotating velocity
Type
thesis
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