Linear Vibration Motor with Iron Core for Faster Response
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Solution Overview
Problem
Conventional linear vibration motors provide a relatively small driving force, resulting in long response times due to their reliance on Lorentz force alone for vibration.
Innovation Solution
The motor incorporates an iron core with a coil wound on it, and a baffle system, where the interaction between the magnetic fields of the coil and permanent magnet produces both Lorentz and electromagnetic forces, enhancing the driving force through superposition, allowing for faster vibration response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only Lorentz force from coil-permanent magnet interaction is used to drive vibration, then the structure is simple, but the driving force is small and response time is long
Solution Approach 1:
The patent merges two driving mechanisms: the traditional Lorentz force from coil-permanent magnet interaction, and electromagnetic induction force from coil-iron core interaction. The iron core is positioned between the coil and permanent magnet, creating a dual-force system that combines both electromagnetic effects to generate stronger driving force for vibration.
Solution Approach 2:
The coil serves multiple functions: it generates magnetic field for Lorentz force production with the permanent magnet, and simultaneously acts as an electromagnet that interacts with the iron core to produce electromagnetic induction force. This multi-functionality allows the same component to contribute to both driving mechanisms.
2Device complexity
If only Lorentz force is used for vibration drive, then the structure is simple, but the response time is long
Solution Approach 1:
The patent merges two driving mechanisms: the traditional Lorentz force from coil-permanent magnet interaction, and electromagnetic induction force from coil-iron core interaction. The iron core is positioned between the coil and permanent magnet, creating a dual-force system that combines both electromagnetic effects to generate stronger driving force for vibration.
3Force
If iron core is added to create electromagnetic induction force, then the driving force increases, but the device complexity increases
Solution Approach 1:
The patent merges two driving mechanisms: the traditional Lorentz force from coil-permanent magnet interaction, and electromagnetic induction force from coil-iron core interaction. The iron core is positioned between the coil and permanent magnet, creating a dual-force system that combines both electromagnetic effects to generate stronger driving force for vibration.
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 configuration results in a higher driving force and faster response speed for the vibration motor, effectively addressing the limitations of existing linear vibration motors.
Implementation Method 1
The linear vibration motor usually provides a driving force, only using a Lorentz force that is produced by interaction between magnetic fields of the coil and the permanent magnet
Implementation Method 2
The motor incorporates an iron core with a coil wound on it, where the interaction between the magnetic fields of the coil and permanent magnet produces both Lorentz and electromagnetic forces
Data Source
AI summary
Provided is a linear vibration motor, including: a housing; a vibration unit received in the housing, including a mass with a through hole and a permanent magnet mounted in the through hole; an elastic module; and a driving unit including an iron core fixedly mounted in the housing and passing through the through hole and a coil. The iron core includes an iron core body portion passing through the through hole and two iron core propping portions extending from two ends of the iron core body portion facing away from a central axis of the iron core body portion. The coil is wound on the iron core body portion. A side of the permanent magnet close to the coil and a side of the permanent magnet close to the mass have opposite magnetic polarities, and after the coil is energized, the two iron core propping portions have opposite magnetic polarities.