Linear Vibration Motor Magnet Fixation to Prevent Glue Overflow
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Solution Overview
Problem
In existing linear vibration motors, the glue overflow during magnet assembly reduces bonding strength and affects magnetic field performance due to protrusion of magnets, leading to potential detachment and instability.
Innovation Solution
A linear vibration motor design with a fixation boss on the mass block to secure the middle magnet, utilizing a glue-receiving groove and positioning to prevent glue overflow, enhancing bonding strength and ensuring magnetic field performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If magnets on two sides are first fixed to the mass block by gluing, then the assembly process can be initiated, but glue overflows to positions of the magnets in the middle, causing the magnets in the middle to interfere with the cured glue and cannot be fixed properly
Solution Approach 1:
The mass block is segmented into multiple fixed surfaces, with the bottom wall having a first fixed surface for side magnets and a second fixed surface for the middle magnet. This segmentation allows independent gluing operations for each magnet position, preventing glue contamination between assembly stages.
Solution Approach 2:
The patent performs preliminary gluing of the side magnets to the first fixed surface, allows the glue to cure completely, then performs the gluing of the middle magnet to the second fixed surface. This sequential preliminary action ensures that cured glue does not interfere with subsequent magnet assembly.
2Ease of manufacture
If the magnets in the middle are assembled after side magnets are glued, then all magnets can be positioned, but the magnets interfere with the cured glue and cannot be fixed to the fixed surface, leading to protrusion
Solution Approach 1:
The bottom wall is divided into functionally independent fixed surfaces: a first fixed surface for side magnets and a second fixed surface for the middle magnet. This segmentation isolates the gluing processes, ensuring that cured glue on the first fixed surface does not interfere with the bonding of magnets to the second fixed surface.
Solution Approach 2:
The second fixed surface acts as an intermediary bonding interface specifically dedicated to the middle magnet assembly. By providing a separate fixed surface, the patent ensures optimal bonding conditions for the middle magnet without contamination from previous gluing operations.
3Device complexity
If magnets are glued without a fixation structure, then the assembly process is simple, but the magnets protrude from the mass block, reducing bonding strength and causing vibration instability
Solution Approach 1:
The mass block incorporates localized fixation structures (protrusions) at specific positions on the bottom wall where magnets require enhanced anchoring. These local quality enhancements provide mechanical interlocking for magnets prone to protrusion, while maintaining a simple overall mass block structure without complex global modifications.
Solution Approach 2:
The fixation structures combine mechanical interlocking (physical protrusions from the mass block) with chemical bonding (glue) to create a composite fixation system. This dual-mechanism approach ensures magnets remain firmly attached during vibration while maintaining structural simplicity.
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 effectively prevents glue overflow, improving bonding strength and vibration stability while maintaining magnetic field performance.
Implementation Method 1
The coil interacts with the magnet to generate a driving force to drive the vibration assembly to vibrate back and forth
Implementation Method 2
an elastic member that drives the mass block to move back and forth
Implementation Method 3
The mass block further includes a fixation boss protruding from the bottom wall toward the second magnet, the second magnet being fixed to the fixation boss
Data Source
AI summary
A linear vibration motor includes a housing with a receiving space, a vibration assembly, and a coil. The vibration assembly includes a mass block, a magnet assembly fixed to the mass block, and an elastic member. The mass block is provided with a receiving space for receiving the magnet assembly. The mass block includes a side wall and a bottom wall that enclose to form the receiving space. The magnet assembly includes a first magnet, a second magnet, and a third magnet that are fixed to the bottom wall. The mass block further includes a fixation boss protruding from the bottom wall toward the second magnet. The second magnet is fixed to the fixation boss. In the linear vibration motor, bonding strength between the magnet assembly and the mass block is good, which effectively improves vibration stability and magnetic field performance of the linear vibration motor.