Magnetic Spindle Damping for Critical Speed Vibration Control
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Solution Overview
Problem
Spindles for ring spinning machines with radially passive magnetic bearings experience significant vibrations at critical speeds due to unbalance, leading to increased energy requirements, wear, and maintenance issues, and the use of additional plain bearings increases manufacturing costs and weight.
Innovation Solution
Incorporating damping elements connected to the stator and rotor to absorb critical oscillations, reducing contact between rotor and stator, and using passive magnetic radial bearings with elastic-plastic or viscoelastic materials to dampen vibrations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional plain bearings are used to reduce vibrations at critical speed, then wear and damage to magnetic bearings is reduced, but manufacturing costs and rotor weight increase
Solution Approach 1:
The invention extracts the damping function from separate plain bearings and integrates it into the rotor structure itself through damping elements arranged in the rotor, eliminating the need for additional plain bearings while maintaining vibration protection
Solution Approach 2:
The damping elements are merged with the rotor structure, combining the rotor function with the vibration damping function into a single integrated component, thereby reducing overall device complexity
2Reliability
If additional plain bearings are used to reduce vibrations at critical speed, then contact between rotor and stator is prevented, but rotor weight increases
Solution Approach 1:
The damping elements are integrated into the rotor structure, merging the rotor with the vibration damping function into a single component, thereby preventing rotor-stator contact without adding separate bearing components that would increase weight
Solution Approach 2:
The rotor is designed as a composite structure incorporating damping elements made of viscoelastic or elastoplastic materials, creating a multi-material rotor that provides both structural support and vibration damping functionality
3Reliability
If additional plain bearings are used to reduce vibrations at critical speed, then magnetic bearing damage is avoided, but energy requirement for startup increases
Solution Approach 1:
The damping function is extracted from separate plain bearings and integrated into the rotor structure through damping elements, eliminating the need for additional mechanical components that would increase startup energy requirements
Solution Approach 2:
The invention changes the physical state and parameters of the rotor by incorporating viscoelastic or elastoplastic damping elements, modifying the rotor's vibrational characteristics to reduce critical speed effects without adding mechanical friction from plain bearings
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 solution reduces energy requirements for startup, minimizes wear, and enhances operational efficiency by preventing contact between rotor and stator, thereby extending spindle lifespan and reducing maintenance and operational costs.
Implementation Method 1
using passive magnetic radial bearings with elastic-plastic or viscoelastic materials to dampen vibrations effectively
Implementation Method 2
using passive magnetic radial bearings with elastic-plastic or viscoelastic materials to dampen vibrations effectively
Implementation Method 3
Incorporating damping elements connected to the stator and rotor to absorb critical oscillations
Implementation Method 4
A spindle for a ring spinning machine is known, for example, from WO 2017/064214 A1. The spindle shown therein comprises a spindle shaft which is mounted radially via at least two radial magnetic bearings
Data Source
Figure 1
AI summary
The invention relates to a spindle (1) for spinning machines having a single-motor drive, which spindle comprises a rotor (2) and a stator (3) connected to a spindle bearing housing (4). The rotor (2) is mounted in the stator (3) by at least two passive, magnetic radial bearings (5a, 5b), is driven by a motor (6), and is mounted by a further active, magnetic axial bearing (7). According to the invention, the stator (3) is connected to the spindle bearing housing (4) by means of at least one damping element (9a, 9b).