Vibration Motor Holder Stabilizes Reciprocation
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Solution Overview
Problem
Conventional vibration motors face instability in reciprocation due to the magnetic fluid's difficulty in precisely holding the moving body, leading to unpredictable vibration performance.
Innovation Solution
The vibration motor design incorporates a stationary portion with a coil and an elastic member, where the movable portion is supported by a holder and a spiral spring, allowing for stable vibration along a central axis with improved magnetic field containment and reduced size, enhancing vibration characteristics and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If magnetic fluid is used to hold the moving body, then the structure is simplified, but the holding precision and reciprocation stability deteriorate
Solution Approach 1:
The patent introduces a holder as an intermediary component between the magnet and the magnetic fluid. The holder has a magnetic fluid holding portion that contains the magnetic fluid, which then acts on the magnet through a gap. This intermediary structure allows the magnetic fluid to hold the magnet more precisely while maintaining structural simplicity, resolving the contradiction between simplification and stability.
2Reliability
If the holder extends in the reciprocation direction, then the magnetic fluid holding capability is improved, but the device length increases
Solution Approach 1:
The patent changes the orientation of the holder from extending in the reciprocation direction (up-down direction) to extending in the radial direction (width direction). The holder has a width greater than its length in the reciprocation direction, allowing the magnetic fluid holding portion to extend radially outward. This dimensional change improves magnetic fluid holding capability while keeping the device length compact, resolving the contradiction between holding capability and device length.
3Reliability
If multiple elastic members are added to support the movable portion, then the vibration stability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines the support function with the existing holder structure. The holder not only holds the magnet but also serves as the support structure for the movable portion. The single holder structure integrates multiple functions (magnetic fluid containment, magnet positioning, and mechanical support), eliminating the need for separate elastic members while maintaining vibration stability. This merging of functions reduces component count and complexity while preserving reliability.
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 stabilizes the vibration of the movable portion, increases the magnetic force, and reduces the motor's size, resulting in improved vibration performance and simplified assembly, while minimizing the need for additional elastic members and reducing costs.
Implementation Method 1
a coil which can apply a driving force to the movable portion
Implementation Method 2
The elastic member is disposed between the upper portion and the case 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, 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 case including a housing disposed radially outside from the movable portion and having a cylindrical shape extending along the central axis; and a coil, capable of applying a driving force to the movable portion. The movable portion has: a magnet, extending along the central axis; and a holder, disposed above the magnet. The holder has: an upper portion, extending in a direction intersecting with the central axis and disposed above an upper surface of the magnet; and a side surface portion, extending downward from a radial outer edge part of the upper portion and fixed to a radial outer side surface of the magnet.