Compact Vibration Motor Bracket Layout Without Driving Force Loss
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Solution Overview
Problem
Conventional vibration motors are large due to the external support parts, making it challenging to downsize them while maintaining functionality.
Innovation Solution
The vibration generating device incorporates a housing, a movable body, a support member, a bracket with a reinforcing part, a coil, and a permanent magnet. The bracket is attached to the housing via an attachment plate part, and the coil and permanent magnet are positioned to generate vibration along a specific direction, with the reinforcing part extending from inside the sub-bundle wire part to outside the permanent magnet, allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional vibration motors use external support parts (L-shaped support parts) to fix the coil and magnetic steel, then the structural stability is improved, but the device size increases
Solution Approach 1:
The patent merges the support function into the bracket itself by forming a through-hole that passes through the coil and magnetic steel assembly. The bracket's through-hole structure simultaneously provides mechanical support and alignment functions, eliminating the need for separate L-shaped support parts. This integration reduces the overall device volume while maintaining structural stability during vibration operation.
Solution Approach 2:
The coil and magnetic steel are nested within the bracket's through-hole structure, with the coil positioned in the through-hole and the magnetic steel attached to the vibration member within the same space. This nested arrangement allows multiple components to occupy overlapping spatial volumes, reducing the overall device footprint while maintaining proper component spacing and structural integrity.
2Volume of moving object
If the coil and permanent magnet are positioned closer to reduce device size, then the device volume is reduced, but the driving force may be compromised
Solution Approach 1:
The patent optimizes the spatial arrangement by utilizing the third dimension (depth) more effectively. The coil is positioned in the through-hole with its winding direction perpendicular to the magnetic flux direction, creating an efficient electromagnetic interaction volume. The magnetic steel is positioned at the end of the vibration member within the magnetic field region, maximizing the electromagnetic force generation within the constrained volume without compromising driving force.
Solution Approach 2:
The bracket's through-hole is specifically designed with dimensions and positioning that optimize the local electromagnetic interaction region. The through-hole provides precise positioning for the coil and magnetic steel, ensuring optimal spacing for maximum electromagnetic force generation. The local structural features of the bracket (through-hole geometry, positioning features) are optimized to maintain driving force while minimizing overall device volume.
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 enables the vibration generating device to be downsized without reducing the driving force, improving durability by utilizing an eddy current braking force, and preventing resonance of the vibration body.
Implementation Method 1
a permanent magnet configured to generate a magnetic flux directed toward the main bundle wire part, the permanent magnet being attached to the movable body
Implementation Method 2
improving durability by utilizing an eddy current braking force
Data Source
AI summary
A vibration generating device includes a movable body in a housing, supported to vibrate along a first direction; a bracket attached to the housing, including a body plate extending in a second direction and a first reinforcing plate extending in a third direction from one end of the body plate in the second direction; a coil attached to the body plate, including main-bundle-wire-parts in the second direction connected by a sub-bundle-wire-part; and a magnet attached to the movable body on another side of the coil in the third direction, generating a magnetic flux toward the main-bundle-wire-part. One end of the magnet in the second direction is inside one end of the sub-bundle-wire-part in the second direction. The first reinforcing plate extends from inside one end of the sub-bundle-wire-part in the second direction and outside one end of the magnet in the second direction, toward another side in the third direction.