Linear Vibration Motor Magnetic Spring Support
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Solution Overview
Problem
Traditional linear vibration motors face issues with mechanical spring deformation, noise, and reduced lifespan due to stress and collision, which affect their performance and reliability.
Innovation Solution
The use of a magnetic conductive body made of soft magnetic material interacting with a permanent magnet to provide a magnetic spring function, eliminating the need for mechanical springs and reducing the risk of deformation and noise, with control coils generating an electromagnetic field to control the vibrator's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical spring part is used to support the vibrator, then the vibrator can be supported and vibration can be transmitted, but the spring part is prone to deformation, noise, and reduced lifespan due to stress and collision
Solution Approach 1:
The patent replaces the mechanical spring support system with a magnetic field-based support system. The vibrator is supported by magnetic attraction between permanent magnets and magnetic conductive bodies, eliminating mechanical contact and spring deformation. This substitution of mechanical support with magnetic field support resolves the issues of spring part deformation, noise, and reduced lifespan.
Solution Approach 2:
The patent introduces magnetic conductive bodies as intermediaries between the vibrator and the housing. These magnetic conductive bodies interact with permanent magnets to provide magnetic support and guidance for the vibrator, replacing the direct mechanical spring support and reducing harmful mechanical interactions.
2Reliability
If a clearance is provided for the mass block to vibrate, then mechanical spring contact is prevented, but the mass block weight is reduced and performance is lowered
Solution Approach 1:
The patent replaces mechanical spring support with magnetic field support, allowing the mass block to be heavier without risking spring contact. The magnetic field provides continuous support and guidance, enabling the use of higher density materials for the mass block to improve vibration performance while maintaining reliability.
3Ease of manufacture
If the spring part is laser welded, then it can be fixed, but the spring part is sensitive to flatness and difficult to shape, causing deformation and collision
Solution Approach 1:
The patent replaces the mechanical spring part with permanent magnets and magnetic conductive bodies, which can be more easily manufactured and positioned. The magnetic components can be precisely positioned and fixed without the flatness sensitivity issues that plague laser-welded spring parts, improving both manufacturability and precision.
4Duration of action of moving object
If the spring part is used, then vibration transmission is achieved, but the spring element rubs internally generating heat and reducing lifespan
Solution Approach 1:
The patent replaces the mechanical spring element with a magnetic field-based support system. The magnetic attraction between permanent magnets and magnetic conductive bodies provides vibration transmission and support without internal friction and heat generation, eliminating the thermal issues that reduce spring element lifespan.
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 solution enhances the reliability and performance of linear vibration motors by providing a balanced position for the vibrator, simplifying manufacturing, and reducing mechanical losses, while increasing the driving force and extending the motor's lifespan.
Implementation Method 1
the magnetic conductive body is provided in a direction of the linear movement path near the vibrator for interacting with the permanent magnet, such that the vibrator tends towards a balanced position in the linear movement path in a non-activated state
Implementation Method 2
The coil 16 when powered on generates a force to move the vibrator
Data Source
AI summary
A linear vibration motor and an electronic device are provided. The linear vibration motor comprises: a magnetic conductive body; a vibrator comprising a permanent magnet; and a linear movement support, wherein the vibrator is mounted on the linear movement support to move along a linear movement path delimited by the linear movement support, wherein the magnetic conductive body is provided in a direction of the linear movement path near the vibrator for interacting with the permanent magnet, such that the vibrator tends towards a balanced position in the linear movement path in a non-activated state, wherein the magnetic conductive body is made of soft magnetic material, wherein the linear movement support comprises at least one guide shaft along which the vibrator can move axially, and wherein the magnetic conductive body is a magnetic conductive ring surrounding the vibrator.