Nested Hybrid Thrust Bearing to Preserve Magnetic Bearing Gap
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Solution Overview
Problem
In existing hybrid thrust bearings, the integration of an airfoil bearing with a magnetic bearing leads to an increase in the gap between the thrust disk and the magnetic bearing, deteriorating the performance of the magnetic bearing.
Innovation Solution
The airfoil bearing is integrated into the magnetic bearing structure by inserting part of the airfoil bearing into the magnetic bearing's attachment part, with the airfoil pad covering the coil and being fastened to protruding columns, preventing the gap from increasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If an airfoil bearing is simply combined with a magnetic bearing, then the load capacity is improved, but the gap between the magnetic bearing and thrust disk increases causing performance deterioration
Solution Approach 1:
The airfoil bearing is nested within the magnetic bearing structure by inserting the airfoil pad into the attachment part of the magnetic bearing. This nesting arrangement allows the airfoil bearing to be housed inside the magnetic bearing's attachment part, preventing gap increase while maintaining load capacity benefits
Solution Approach 2:
The airfoil bearing is positioned in the radial direction (inserted into the attachment part) rather than only in the axial direction. This dimensional change allows the airfoil bearing to occupy space within the magnetic bearing structure without increasing the axial gap, thereby maintaining magnetic bearing performance while adding load capacity
2Reliability
If the airfoil bearing is inserted into the magnetic bearing attachment part, then the gap increase is prevented, but the structural complexity increases
Solution Approach 1:
The attachment part of the magnetic bearing serves multiple functions: it provides mechanical support for the coil and simultaneously houses the airfoil pad. This multi-functionality reduces the need for additional separate structures, thereby limiting the increase in structural complexity while achieving the integration goal
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This integration maintains the performance of the magnetic bearing while supporting axial loads and reducing lateral vibrations in turbomachinery, enhancing the axial load capacity and damping without additional backup bearings.
Implementation Method 1
magnetic bearings support the axial load using electromagnetic force
Implementation Method 2
thrust bearings include bump foil bearings, leaf foil bearings, porous foil bearings using air lubrication
Data Source
AI summary
The present disclosure relates to a hybrid thrust bearing that combines an airfoil bearing and a magnetic bearing to support a rotating shaft with a disk-shaped thrust disk, and the magnetic bearing includes a disk-shaped housing into which the rotation shaft is inserted through a hole formed in a center and facing the thrust disk, a ring-shaped inner pole part formed around the hole on one side of the housing facing the thrust disk, a ring-shaped outer pole part disposed outside the inner pole part, an attachment part provided between the inner pole part and the outer pole part, and a coil stored in the attachment part, wherein a part of the airfoil bearing is inserted into the attachment part.