Linear Vibration Motor Central Support Resilient Element Design
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Solution Overview
Problem
Miniature linear vibration motors experience stress concentration and reduced effective life due to polarization of elastic sheets or springs fixedly connected to the motor shell, leading to abnormal noise and heat generation during vibration.
Innovation Solution
A linear vibration motor design featuring a central support within the shell to connect a resilient element, rather than attaching it to the ends, which reduces polarization and extends the life of the resilient element, and includes a counterweight portion and permanent magnet for balanced vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the elastic sheet or spring is fixedly connected to the shell at two ends of the vibration assembly, then the vibration motor can achieve reciprocating vibration, but polarization occurs during vibration leading to stress concentration and reduced effective life
Solution Approach 1:
The resilient element is divided into multiple segments or sections along its length, with different stiffness characteristics in different regions. This segmentation allows the element to distribute stress more evenly during vibration, reducing polarization and stress concentration at any single location, thereby extending effective life while maintaining vibration force
Solution Approach 2:
The resilient element is designed with a three-dimensional structure rather than a simple linear connection. By adding dimensional complexity (such as curved paths, multiple attachment points, or spatial configuration), the element can better accommodate vibration movements and reduce polarization effects, improving both reliability and vibration performance
2Stability of the object's composition
If the elastic sheet or spring is fixedly connected to the shell, then the vibration assembly can be supported, but polarization generates abnormal noise and heat
Solution Approach 1:
The resilient element is designed with dynamic characteristics that allow it to adapt its stiffness and damping properties during vibration cycles. This dynamic behavior enables the element to maintain support stability while reducing polarization-induced collisions, thereby minimizing noise and heat generation
Solution Approach 2:
The resilient element's physical parameters (such as material composition, cross-sectional area, or geometric configuration) are optimized to change or vary along its length or during operation. This allows the element to provide stable support while reducing polarization effects that cause noise and heat, resolving the contradiction between stability and harmful factor generation
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 design effectively reduces polarization, noise, and heat generation, while allowing for increased amplitude and suitability for low-frequency vibrations by suspending the vibrator assembly with resilient elements connected to the central support, enhancing the motor's performance and longevity.
Implementation Method 1
a coil and a central support, wherein the shell is provided with a cavity therein and includes a shell wall in parallel to a direction of vibration, and the coil and central support are located within the cavity, the coil being disposed on the shell wall
Implementation Method 2
the resilient element for providing resilient restoring force, through which the vibrator assembly are suspended in the cavity
Data Source
AI summary
The present invention discloses a linear vibration motor. The linear vibration motor comprises: a stator assembly including a shell, a coil and a central support, wherein the shell is provided with a cavity therein and includes a shell wall in parallel to a direction of vibration, and the coil and the central support are located in the cavity, the coil being configured on the shell wall and the central support being configured in the intermediate portion of the shell wall to connect a resilient element; a vibrator assembly including a permanent magnet and a counterweight portion, the permanent magnet and the counterweight portion being connected together; and resilient elements, through which the vibrator assembly is suspended within the cavity, wherein the resilient elements comprise a first end and a second end arranged opposite to each other in the direction of vibration, the first end being connected to the central support and the second end being connected to the vibrator assembly.