Linear Vibration Motor N-Shape Elastic Structure
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Solution Overview
Problem
Existing linear vibration motors suffer from limited vibration effect due to high stroke tension in U-shape elastic pieces and excessive shake in Y-axis and Z-axis directions, compromising their reliability.
Innovation Solution
The linear vibration motor employs a dual-layer, centrally symmetric N-shape elastic structure with multiple elastic pieces arranged reversely on both sides of the vibration unit, featuring a main elastic arm perpendicular to the vibration direction and auxiliary arms to reduce stress and increase rigidity, along with a dual-coil configuration and baffle plates for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If U-shape elastic pieces are used to increase stroke length, then the vibration power is increased, but the stroke tension becomes high which limits the vibration effect
Solution Approach 1:
The elastic piece is divided into multiple segments (first elastic piece, second elastic piece, third elastic piece) connected in series. Each segment has a smaller individual stroke tension, but collectively they achieve the required stroke length. This segmentation reduces the stroke tension of each individual elastic component while maintaining the overall stroke length needed for vibration power.
Solution Approach 2:
The elastic structure transitions from a simple U-shape (2D planar) to a three-dimensional multi-segment configuration. The elastic pieces are arranged in a spatial configuration that allows them to distribute stress more effectively, reducing the tension on each individual piece while maintaining the required stroke length for vibration power.
2Ease of operation
If two elastic pieces are provided symmetrically to enable X-axis vibration, then the vibration function is achieved, but big shake occurs on Y-axis and Z-axis which reduces reliability
Solution Approach 1:
The elastic pieces are arranged in an asymmetric configuration where the first elastic piece is positioned at one end of the vibration unit and the second elastic piece is positioned at the other end, with the third elastic piece connecting them. This asymmetric arrangement creates a rigid triangular structure that effectively constrains motion to the X-axis while minimizing shake on the Y-axis and Z-axis, thereby improving reliability.
Solution Approach 2:
The elastic pieces are pre-positioned and fixed to the vibration unit and base in a specific configuration before operation. This preliminary arrangement ensures that the vibration unit is properly constrained and aligned, preventing excessive shake on unintended axes during vibration operation and maintaining system 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 enhances the motor's vibration performance, extends service life, and significantly reduces shake and shift in the Y-axis and Z-axis directions, thereby improving reliability and stability.
Implementation Method 1
a vibration unit (2) and a first elastic unit (3) and a second elastic unit (4) fixing and suspending the vibration unit (2) in the accommodation space (10)
Implementation Method 2
a coil (5) fixed to the base (1) and driving the vibration unit (2) to vibrate
Data Source
AI summary
A linear vibration motor includes a base including an accommodation space; a vibration unit; and a first elastic unit suspending the vibration unit in the accommodation space. The first elastic unit includes two elastic pieces located on two opposite sides of the vibration unit, each the elastic piece having a main elastic arm, a first auxiliary elastic arm and a second auxiliary elastic arm extending reversely in a bending way respectively from an end of the first auxiliary elastic arm and an end of the second auxiliary elastic arm. The main elastic arm is perpendicular to the vibration direction, the first auxiliary elastic arm and the second auxiliary elastic arm are respectively located on the two opposite sides of the main elastic arm, the first fixed arm is fixed to the vibration unit, and the second fixed arm is fixed to the base.