Linear Vibration Motor with Base-Mounted Magnets
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Solution Overview
Problem
Existing linear vibration motors in mobile devices rely solely on Lorentz force for vibration, resulting in limited vibration effect due to the driving force being generated by a coil alone.
Innovation Solution
The linear vibration motor incorporates a magnet assembly with two oppositely arranged magnets and an iron core, along with multiple coils fixed to a weight, creating a concentrated magnetic field that enhances the Lorentz Force and driving effect, improving vibration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coil is used to generate driving force through Lorentz force, then the structure is simple, but the vibration effect is limited
Solution Approach 1:
The patent combines multiple coils (first coil and second coil) to work together with the vibration unit, creating a merged driving system that generates stronger Lorentz force and improves vibration effect while maintaining reasonable structural complexity
Solution Approach 2:
The vibration unit is segmented into multiple components including first and second vibration units with respective coils, allowing each segment to contribute to the overall driving force while enabling independent optimization of each segment's performance
2Force
If magnets are fixed to the base and coils are fixed to the weight, then the magnetic field is concentrated and driving force is enhanced, but the structural complexity increases
Solution Approach 1:
The patent inverts the conventional arrangement by fixing magnets to the base and coils to the moving weight, rather than the traditional configuration. This inversion creates a concentrated magnetic field between the stationary magnets and moving coils, enhancing Lorentz force while the elastic piece manages the mechanical complexity
Solution Approach 2:
The elastic piece acts as an intermediary component that connects and suspends the vibration unit, managing the mechanical complexity introduced by the inverted magnet-coil arrangement while enabling the concentration of magnetic field for enhanced driving force
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 enhanced magnetic field and Lorentz Force increase the driving force and vibration effect, providing a more robust and effective tactile feedback mechanism for mobile devices.
Implementation Method 1
A magnetic field generated by electrification of the coil interacts with a magnetic field generated by the vibration unit to drive the vibration unit to do reciprocating rectilinear motion to generate vibration
Implementation Method 2
The linear vibration motor incorporates a magnet assembly with two oppositely arranged magnets and an iron core, along with multiple coils fixed to a weight, creating a concentrated magnetic field that enhances the Lorentz Force
Data Source
AI summary
An embodiment of the invention provides a linear vibration motor. The linear vibration motor includes a base with a containing space, a vibration unit arranged in the containing space, an elastic piece suspending the vibration unit in the containing space, and a magnet assembly fixed to the base and driving the vibration unit to vibrate. The vibration unit includes a weight, a containing groove penetrating through the weight and at least one pair of coils which are oppositely fixed to the weight. The magnet assemblies has two magnets which are respectively fixed on two opposite sides of the base. The two magnets are at least partially located in the containing grooves, and are magnetized in the vibration direction. Compared with the related art, the linear vibration motor is improved in vibration performance and reliability.