Four-Coil Linear Vibration Motor with Double Resonance
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Solution Overview
Problem
Existing linear vibration motors in mobile electronic products have limited driving force due to a single or dual coil configuration, restricting their vibration performance and service life.
Innovation Solution
A linear vibration motor design featuring a four-coil structure with two first coils disposed parallel to the cover plate and two second coils perpendicular to it, along with a counterweight block and magnetic steel for increased weight and stability, forming a double resonance vibration structure that enhances the Lorentz force and vibration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single or dual coil configuration is used in the drive unit, then the device complexity is reduced and ease of manufacture is improved, but the driving force and vibration performance are limited
Solution Approach 1:
The drive unit is segmented into multiple independent coils (first coil and second coil) arranged in different spatial orientations. Each coil generates magnetic field components that collectively contribute to the overall driving force, resolving the contradiction by dividing the driving function across multiple simpler elements rather than using a single complex coil structure
Solution Approach 2:
The patent introduces spatial dimensionality by arranging coils in different orientations (first coil in first direction, second coil in second direction perpendicular to the first). This multi-dimensional coil arrangement enables the generation of driving force in multiple directions simultaneously, significantly enhancing the overall driving capability while maintaining the simplicity of individual coil structures
2Power
If a four-coil structure with multiple orientations is implemented, then the driving force and vibration performance are significantly enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges multiple coil structures into a unified drive unit assembly where the first and second coils are integrated around a common iron core. This merging approach allows the complex multi-coil structure to function as a single coordinated unit, enhancing vibration performance while managing manufacturing complexity through integrated design
Solution Approach 2:
The drive unit with multiple coils serves multiple functions simultaneously: generating driving force in multiple directions, creating complex vibration patterns, and providing enhanced feedback capabilities. This multi-functionality justifies the increased structural complexity by delivering superior overall performance that cannot be achieved with simpler single-coil configurations
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 four-coil configuration significantly increases the driving force and vibration performance of the motor, improving the amplitude and stability of vibrations, thereby extending the service life and enhancing feedback capabilities in mobile devices.
Implementation Method 1
A magnetic field generated by a coil of the drive unit and a magnetic field generated by the vibration unit interact to drive the vibration unit to make a reciprocal linear movement to generate vibration
Data Source
AI summary
Disclosed is a linear vibration motor, including a base, a cover plate, a vibration unit, and a drive unit. The vibration unit includes a counterweight block and a magnetic steel. An accommodating groove is provided in the counterweight block. At least two pieces of magnetic steel are respectively located on two opposite sides of the accommodating groove. The drive unit includes an iron core accommodated in the accommodating groove and fixed on the base and two first coils and two second coils that are respectively fixedly sleeved over the iron core. The two second coils and two pieces of magnetic steel are together circumferentially disposed in the accommodating groove and are arranged alternately.