Axial Bearing Pole Disk Geometry for Radial Force Reduction
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Solution Overview
Problem
Existing axial bearings for spinning rotors in open-end spinning machines have a weak upwardly directed radial force component due to manufacturing tolerances and high production costs, necessitating a cost-effective solution for non-uniform radial force distribution.
Innovation Solution
An axial bearing with a static bearing component comprising axially polarized permanent magnet rings and ferromagnetic pole disks, where the pole disks feature a chamfer and/or non-ferromagnetic material on the inner circumference to reduce radial forces, allowing targeted force distribution and cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the annular gap in the vertical axis is increased to reduce radial forces, then the upwardly directed radial force component weakens, but the manufacturing cost increases due to high precision requirements
Solution Approach 1:
The pole disk is designed with non-uniform thickness: the vertical axis region has reduced thickness (via chamfer) to locally reduce radial forces, while other regions maintain standard thickness to preserve axial rigidity. This local differentiation allows non-uniform radial force distribution without requiring uniform high-precision manufacturing throughout the entire disk.
Solution Approach 2:
The pole disk intentionally breaks rotational symmetry by creating a chamfer or reducing thickness specifically in the vertical axis region. This asymmetric design creates different annular gap widths at different angular positions, enabling targeted reduction of radial forces in the vertical direction while maintaining structural integrity elsewhere.
2Force
If the pole disk thickness is reduced in the vertical axis region, then radial forces are reduced, but the axial rigidity may be compromised
Solution Approach 1:
The thickness reduction (chamfer) is applied locally only to the vertical axis region where radial force reduction is needed. The majority of the pole disk maintains its full thickness, preserving sufficient axial rigidity for overall structural support while achieving local radial force optimization.
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
The solution effectively reduces radial forces by altering the pole disk design, enhancing manufacturing efficiency and preventing rotor shaft contact with pole disks, while maintaining axial rigidity and providing impact protection.
Implementation Method 1
a static bearing component, which has at least two axially polarized permanent magnet rings delimited on both sides by ferromagnetic pole disks
Implementation Method 2
the strength of the upwardly directed radial force component of the magnetic axial bearing
Data Source
AI summary
An axial bearing for a spinning rotor of an open-end spinning machine includes a static bearing component having axially polarized permanent magnet rings delimited on both sides by ferromagnetic pole disks arranged in a bearing housing, the static bearing component interacting with a dynamic bearing component formed by ferromagnetic webs arranged on a rotor shaft of the spinning rotor. Each pole disk includes a disk ring, a central opening, a vertical axis, and a horizontal axis. The disk ring includes an area of reduced ferromagnetic material on an inner circumference thereof at the vertical axis as compared to a remaining inner circumferential area of the disk ring.