Vibration Motor Elastic Support for Stable Reciprocation
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Solution Overview
Problem
Conventional vibration motors face challenges in stabilizing the reciprocation of the moving body due to difficulties in coupling with magnetic fluid, leading to unstable vibrations and increased complexity in design.
Innovation Solution
A vibration motor design featuring a stationary portion with a cylindrical housing, a movable portion with a magnet, and an elastic member that supports the movable portion for stable vibration along a central axis, utilizing a coil to generate a magnetic field and an elastic member to stabilize the vibration, while minimizing the need for additional elastic members and reducing the risk of magnetic attraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic fluid is used to support the moving body reciprocation, then the moving body can be supported, but coupling between the magnetic fluid and other members becomes difficult leading to unstable reciprocation
Solution Approach 1:
The patent removes the magnetic fluid from the system entirely and replaces it with a mechanical elastic member (spring) for supporting the moving body's reciprocation. This extraction eliminates the coupling difficulties inherent in magnetic fluid systems while maintaining the necessary support function, thereby improving reliability without the complexity of magnetic fluid coupling.
Solution Approach 2:
The patent substitutes the magnetic fluid-based support system with a purely mechanical elastic member system. The elastic member provides direct mechanical support for reciprocation, replacing the indirect magnetic field-based support that suffered from coupling issues. This mechanical substitution simplifies the system while ensuring stable reciprocation.
2Reliability
If multiple elastic members are used to support the movable portion, then vibration stability can be improved, but device complexity and cost increase
Solution Approach 1:
The patent designs a single elastic member that performs multiple functions: supporting the movable portion's reciprocation, providing vibration stability, and acting as a mechanical stop. This multi-functional design eliminates the need for separate components, achieving vibration stability without increasing device complexity or requiring multiple elastic members.
Solution Approach 2:
The patent combines the support function and vibration stabilization function into a single elastic member rather than using separate components. The elastic member is positioned and configured to simultaneously provide upward support during reciprocation and limit downward movement, merging multiple functions into one component to reduce complexity.
3Reliability
If magnetic fluid is used for support, then the moving body can be suspended, but the risk of magnetic attraction between components increases
Solution Approach 1:
The patent extracts the magnetic fluid from the support mechanism, eliminating the source of unwanted magnetic attraction between components. By using a mechanical elastic member instead, the system maintains support stability without the harmful magnetic interactions that occur when magnetic fluid is present in close proximity to other magnetic components.
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 design achieves stable and efficient vibration with reduced resilience and complexity, enhancing product performance and cost-effectiveness by eliminating the need for dual elastic members and minimizing magnetic attraction issues.
Implementation Method 1
a coil that can apply a driving force to the movable portion
Implementation Method 2
The elastic member is fixed to both the top surface portion and the movable portion, and supports the movable portion in a way that the movable portion is capable of vibrating along the central axis
Data Source
AI summary
A vibration motor and a tactile device are provided. The vibration motor has: a stationary portion; a movable portion having a magnet and capable of vibrating with respect to the stationary portion along a central axis extending in an up-down direction; and an elastic member. The stationary portion has: a housing, disposed radially outside from the movable portion and having a cylindrical shape extending along the central axis; a top surface portion, disposed above the movable portion, fixed to the housing, and extended in a direction intersecting with the central axis; and a coil, capable of applying a driving force to the movable portion. The elastic member is disposed below the top surface portion and above the movable portion. The elastic member is fixed to the top surface portion and the movable portion and supports the movable portion so that the movable portion can vibrate along the central axis.