Linear Vibration Motor Coil Alignment With Stepped Iron Core
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Solution Overview
Problem
Existing linear vibration motors face difficulties in assembly due to flush end surfaces of the iron core, making it challenging to align the coil assembly correctly, which affects the motor's performance and service life.
Innovation Solution
The linear vibration motor design incorporates iron core extension portions with recess and bulge features, allowing for easier alignment and assembly of the coil assembly, while optimizing the surface distances between these features to enhance vibration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the iron core end surfaces are arranged flush with the iron core extension portion, then the structure is simple, but the assembly alignment is difficult
Solution Approach 1:
The patent applies asymmetry by designing the iron core extension portion with a stepped structure that protrudes beyond the iron core end surface in a specific direction. This asymmetric design creates a unique alignment feature that guides the coil assembly during assembly, making the alignment process easier while maintaining overall structural simplicity.
Solution Approach 2:
The patent extends the iron core in a direction perpendicular to the vibration direction, creating a multi-dimensional structure. The iron core extension portion protrudes in the radial direction, providing an additional dimensional feature for alignment that simplifies the assembly process without complicating the core vibration mechanism.
2Ease of manufacture
If the coil assembly is aligned using flush surfaces, then the manufacturing process is straightforward, but the alignment precision is poor
Solution Approach 1:
The asymmetric stepped structure of the iron core extension portion provides a unique geometric feature that ensures precise alignment. The protruding extension creates a single correct positioning orientation, eliminating alignment ambiguity and improving precision while keeping the manufacturing process straightforward.
Solution Approach 2:
The iron core extension portion acts as a self-aligning feature that guides the coil assembly into the correct position during assembly. The geometric shape of the extension automatically ensures proper alignment without requiring additional alignment tools or complex procedures, achieving both ease of manufacture and high precision.
3Ease of manufacture
If the iron core extension portions are added for alignment, then the assembly is easier, but the device complexity increases
Solution Approach 1:
The iron core extension portion serves multiple functions: it provides alignment guidance for the coil assembly, maintains structural integrity, and defines the magnetic circuit geometry. By combining multiple functions into a single structural feature, the patent improves assembly ease without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the alignment feature with the iron core structure itself, rather than adding a separate alignment component. The iron core extension portion is integrated into the core assembly, combining the structural support function with the alignment guidance function, thereby minimizing the increase in device complexity.
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 facilitates easier assembly and improves vibration performance by reducing magnet attraction and increasing driving force, resulting in a more reliable and efficient linear vibration motor.
Implementation Method 1
A magnetic field generated by the coil interacts with a magnetic field generated by the vibration unit, thereby driving the vibration unit for doing reciprocating linear motion for generating vibration
Implementation Method 2
an elastic member that suspends the vibration unit in the receiving space
Data Source
AI summary
The present invention provides a linear vibration motor, including a housing with a receiving space; a vibration unit arranged in the receiving space; an elastic member that suspends the vibration unit in the receiving space; and a coil assembly fixed to the housing and driving the vibration unit to vibrate. Compared with the related art, the linear vibration motor of the present invention is easy to assemble and good in vibration performance.