Linear Vibration Motor Magnetic Conductive Brush Design
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Solution Overview
Problem
Existing micro vibration motors in portable electronic devices suffer from a dispersed magnetic field, resulting in weak magnetic conductive strength between the vibrator and stator, leading to a small magnetic flux and inadequate vibration force.
Innovation Solution
A linear vibration motor design that incorporates a magnetic conductive brush between the stator and vibration block to concentrate and guide magnetic field lines to the stator coils, enhancing the effective magnetic field and increasing the acting force between the vibrator and stator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If magnetic members are disposed side by side with the same magnetization direction, then the structure is simple and easy to manufacture, but the magnetic field lines become dispersed and the magnetic conductive strength between vibrator and stator becomes weak
Solution Approach 1:
A magnetic conductive brush is introduced as an intermediary component between the vibration block and stator. The brush includes magnetic conductive brush hairs that extend from a support and contact the magnetic conductive yoke, providing a dedicated magnetic conduction path that concentrates magnetic field lines and enhances magnetic coupling without requiring complex magnet arrangements
Solution Approach 2:
The magnetic conductive brush creates localized regions of enhanced magnetic conductivity at the contact points between brush hairs and the yoke. This concentrates the magnetic field in specific areas where it is most needed, improving magnetic coupling efficiency without changing the overall magnet configuration
2Force
If the distance between stator coil and vibrator is reduced to increase magnetic flux, then the magnetic conductive strength improves, but the vibration space becomes constrained and manufacturing precision requirements increase
Solution Approach 1:
The magnetic conductive brush acts as a mediator that extends the magnetic coupling path without requiring the stator and vibrator to be in direct close contact. The brush hairs bridge the gap between components, maintaining effective magnetic flux while allowing greater manufacturing tolerances and vibration amplitude
Solution Approach 2:
Instead of reducing the vertical distance between stator and vibrator, the magnetic conductive brush extends the magnetic conduction path in a different dimensional direction - through the brush hairs that contact the yoke surface. This provides an alternative path for magnetic flux that doesn't constrain the primary vibration direction
3Force
If a magnetic conductive brush is added to concentrate magnetic field lines, then the magnetic conductive strength and vibration force improve, but the device complexity increases
Solution Approach 1:
The magnetic conductive brush is a relatively simple intermediary component consisting of a support and multiple brush hairs made of magnetic conductive material. It adds minimal structural complexity while significantly improving magnetic coupling through its ability to concentrate and guide magnetic field lines from the yoke to the stator
Solution Approach 2:
The magnetic conductive brush serves multiple functions simultaneously: it concentrates magnetic field lines, provides a mechanical connection between vibration block and stator, allows for relative movement during vibration, and maintains consistent magnetic coupling. This multi-functionality justifies the added component with multiple benefits
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 significantly improves the vibration force of the micro vibration motor without increasing its volume by maximizing the magnetic field utilization, resulting in a more intense and effective vibration effect.
Implementation Method 1
a magnetic conductive brush is fixed on the magnetic conductive core of the stator, and a brush head of the magnetic conductive brush is in elastic contact with the magnetic conductive yoke of the vibration block
Implementation Method 2
after the coil is energized, the stator will be subject to the Lorentz force which drives the stator to move, and the vibrator will be subjected to an acting force in the opposite direction
Data Source
AI summary
A linear vibration motor includes a vibration block having permanent magnets and magnetic conductive yokes between adjacent permanent magnets; and a stator having stator coils arranged corresponding to the vibration block and magnetic conductive cores in the stator coils, a magnetic conductive brush being fixed on the magnetic conductive cores and a brush head of the brush being in elastic contact with the magnetic conductive yokes; or, a magnetic conductive brush being fixed on the magnetic conductive yokes and the brush head of the brush being in elastic contact with the magnetic conductive cores. The magnetic field lines generated by the vibration block can be concentrated to be conducted to the stator coils, thereby maximizing the effective magnetic field of the vibration block to improve the acting force between the vibrator and the and obtain an intensified vibration effect.