Vibration Generator Eddy-Current Damping for Resonance Durability
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Solution Overview
Problem
Existing vibration generating devices face durability concerns due to the use of viscoelastic members, which are prone to temperature variations, dimensional changes, degradation, and other environmental factors.
Innovation Solution
A vibration generating device is designed with a conductive member, such as a bracket made of copper, that generates an eddy current when the movable body vibrates, reducing acceleration and suppressing resonance without the need for a gel-like damper member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a viscoelastic member (gel-like damper) is used to suppress resonance, then vibration damping is achieved, but durability deteriorates due to temperature variations, dimensional changes, and degradation
Solution Approach 1:
The patent replaces the mechanical viscoelastic damping system with an electromagnetic damping system. A conductive member (bracket) interacts with a magnetic flux generating member (magnet) to produce eddy currents that generate braking force for vibration suppression. This substitution eliminates the durability issues of viscoelastic materials while maintaining effective resonance suppression.
Solution Approach 2:
The conductive member utilizes the movement of the movable body itself to generate eddy currents. As the movable body vibrates, the conductive member cuts through magnetic flux lines, automatically generating a braking force that opposes the vibration. This self-regulating mechanism eliminates the need for external control systems and provides inherent vibration suppression.
2Reliability
If a conductive member is introduced to generate eddy current for suppressing resonance, then durability is improved, but device complexity increases
Solution Approach 1:
The conductive member (bracket) serves multiple functions: it provides structural support for the coil assembly and simultaneously acts as the damping element that generates eddy currents. The magnet serves dual purposes as part of the magnetic drive circuit and as the magnetic flux generating member for the damping function. This multi-functionality reduces the need for additional components.
Solution Approach 2:
The patent merges the structural bracket with the conductive damping member, and integrates the magnet into both the drive circuit and damping system. By combining multiple functions into single components, the overall device complexity is minimized while achieving effective vibration suppression through eddy currents.
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 configuration enhances the durability of the vibration generating device by utilizing the eddy current-induced braking force to effectively suppress resonance, thereby improving the device's operational stability and longevity.
Implementation Method 1
a conductive member that is fixed to the coil and extends along the first direction so as to cross the magnetic flux, and is configured to reduce an acceleration of the movable body by generating an eddy current in response to a movement of the movable body along the first direction
Implementation Method 2
a magnetic flux generating member configured to generate a magnetic flux that passes through the wire bundle along a third direction perpendicular to each of the first direction and the second direction
Implementation Method 3
a magnetic drive circuit including a coil and a magnet
Data Source
AI summary
A vibration generating device includes a housing; a movable body housed in the housing; a supporting member configured to support the movable body to be vibratable along a first direction; a coil including a wire bundle that extends along a second direction perpendicular to the first direction; and a magnetic flux generating member configured to generate a magnetic flux that passes through the wire bundle along a third direction perpendicular to each of the first direction and the second direction.