Vibration Motor Lorentz Force Driving Mechanism
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Solution Overview
Problem
Existing vibration motors in portable electronic devices face insufficient driving force due to mutual induction between coils and magnet steel, failing to meet performance requirements for effective vibration feedback.
Innovation Solution
A vibration motor design featuring a housing with a driving apparatus comprising a coil and an iron core, where the iron core extends between two symmetrically disposed coils, generating a magnetic field to drive a magnet steel vibrator, utilizing Lorentz force for linear vibration, and supported by C-type springs to enhance driving force without increasing motor dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If mutual induction between coil and magnet steel is used to drive the vibrator, then the structure is simple, but the driving force is insufficient
Solution Approach 1:
The patent replaces the traditional electromagnetic mutual induction mechanism with a Lorentz force-based driving system. By introducing a permanent magnet assembly and using a coil to generate a magnetic field that interacts with the permanent magnet, the system achieves stronger driving force through direct Lorentz force action rather than indirect mutual induction, resolving the contradiction between sufficient driving force and structural simplicity.
Solution Approach 2:
The patent changes the fundamental operating parameter from mutual induction to Lorentz force generation. By modifying the magnetic field interaction mechanism - using a permanent magnet with specific magnetic pole arrangements and a coil configured to generate perpendicular magnetic fields - the system achieves enhanced driving force while maintaining reasonable structural complexity through optimized parameter configurations.
2Force
If the motor dimensions are increased to provide larger driving force, then the driving force is improved, but the device size increases
Solution Approach 1:
The patent achieves higher driving force within compact dimensions by fundamentally changing the force generation mechanism to Lorentz force. The permanent magnet assembly with optimized magnetic pole distribution and the coil configuration enable strong magnetic field interactions in a small volume, allowing the driving force to be significantly improved without increasing motor dimensions.
Solution Approach 2:
The patent concentrates magnetic field strength and Lorentz force generation in the specific region where the coil and permanent magnet interact. By optimizing the local magnetic field distribution through strategic placement of magnetic poles and coil windings, the system achieves maximum driving force density within the available space, improving force output without proportionally increasing overall motor volume.
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 new design achieves a larger driving force and improved vibration effect while maintaining the same motor dimensions, providing better system feedback in portable devices.
Implementation Method 1
utilizing Lorentz force for linear vibration
Implementation Method 2
generating a magnetic field to drive a magnet steel vibrator
Data Source
AI summary
Disclosed is a vibration motor including a housing, a vibrator accommodated in the housing, a driving apparatus, and an elastic part elastically supporting the vibrator. The housing includes a top wall, a bottom wall and a side wall, the vibrator includes a counterweight block and a magnet steel disposed therein, and the counterweight block includes an upper surface, a lower surface, and an inner wall connecting the upper surface and the lower surface. The driving apparatus includes a first coil, a second coil, and an iron core. The iron core includes a main body portion, a first fixed end, and a second fixed end, the first coil is sleeved over the first fixed end, the second coil is sleeved over the second fixed end, and the main body portion of the iron core is disposed in the hollow portion and disposed opposite and spaced from the magnet steel.