Electromagnetic Rotary Machine Damper for Wear-Free Vibration Damping
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Solution Overview
Problem
Friction-type dampers for rotary machines suffer from wear and tear, leading to a relatively short lifespan.
Innovation Solution
A rotary machine damper comprising an inner member, an outer member, and magnets, where one member is electrically conductive, generating an electromagnetic induction force to dampen axial and radial vibrations without friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction-type dampers are used to suppress vibration, then damping force is generated, but components are susceptible to wear and tear resulting in short life
Solution Approach 1:
The patent replaces the friction-based mechanical damping system with an electromagnetic damping system. The electromagnetic damper uses a magnet and an electrically conductive member to generate damping force through electromagnetic induction, eliminating the need for friction-based mechanical contact. This substitution resolves the contradiction by providing effective damping performance without the wear and tear that limits the service life of friction-type dampers.
2Object-affected harmful factors
If friction-based damping is used, then vibration is suppressed, but the damping mechanism suffers from wear leading to reduced durability
Solution Approach 1:
The patent substitutes the friction-based mechanical damping mechanism with an electromagnetic damping mechanism. The electromagnetic damper generates damping force through electromagnetic induction between a magnet and an electrically conductive member, eliminating mechanical friction and contact wear. This allows effective vibration suppression while significantly improving durability by removing the wear-related failure mode inherent in friction-based systems.
3Duration of action of moving object
If electromagnetic induction is used for damping, then friction is eliminated extending component life, but device complexity increases due to magnet and conductive member configuration
Solution Approach 1:
The patent applies multi-functionality by designing the electrically conductive member to serve both as a structural component of the damper and as the element that generates damping force through electromagnetic induction. The conductive member can be integrated with existing damper structures, allowing it to fulfill multiple roles: providing mechanical support and generating electromagnetic damping. This reduces overall device complexity despite introducing electromagnetic components.
Solution Approach 2:
The patent merges the magnet and the electrically conductive member into a compact configuration where the conductive member is positioned within the magnetic field. By combining these elements in an integrated structure rather than separate components, the design reduces complexity while maintaining the electromagnetic damping function. The magnet and conductive member work together as a unified damping system.
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
Extends the life of rotary machine dampers by effectively damping vibrations through electromagnetic induction, improving durability and stability.
Implementation Method 1
One of the inner member and the outer member is an electrically conductive member, and the magnet is fixed to the other one of the inner member and the outer member and faces the one of the inner member and the outer member through a gap. The inner member is displaceable in the axial and radial directions of the shaft, and electromagnetic induction electromotive force based on displacement of the inner member damps axial and radial vibration of the shaft.
Data Source
AI summary
A rotary machine damper includes: an inner member that is capable of supporting a bearing that rotatably supports a shaft of a rotary machine; an outer member that is provided on an outer circumferential side of the inner member; and a magnet. One of the inner member and the outer member is an electrically conductive member, and the magnet is fixed to the other one of the inner member and the outer member and faces the one of the inner member and the outer member through a gap.