Multifunctional Sounding Device Magnetic Circuit Design
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Solution Overview
Problem
Existing multifunctional sounding devices face challenges in miniaturization due to increased thickness and interference between magnetic field driving forces from the sounding unit and motor assembly, resulting in poor acoustic and vibration performance.
Innovation Solution
A multifunctional sounding device design featuring a housing with a sounding unit and a motor assembly, where the magnetic circuit system is elastically connected to the housing and includes a through hole for accommodating the motor assembly, allowing for perpendicular vibration directions and reduced magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the motor assembly is stacked below the sounding unit, then the multifunctional sounding device can be independently controlled for vibration and sound functions, but the thickness of the device is increased
Solution Approach 1:
The patent merges the motor assembly and sounding unit into a shared magnetic circuit system where both functions use the same magnetic steel plates and magnetic field. The motor assembly and vibration system are integrated within the same magnetic circuit structure, allowing independent control while sharing common components, thereby reducing overall thickness.
Solution Approach 2:
The magnetic circuit system serves dual purposes: it provides magnetic field for the motor assembly to drive vibration and simultaneously provides magnetic field for the sounding unit to produce sound. The same magnetic steel plates and magnetic circuit structure are universally used for both functions, eliminating the need for separate magnetic circuits and reducing device thickness.
2Adaptability or versatility
If respective magnetic steel plates of the sounding unit and motor assembly are not in the same plane, then the functions can be independently controlled, but the magnetic field driving forces interfere with each other
Solution Approach 1:
The patent employs asymmetric arrangement of magnetic steel plates where the motor magnetic steel plate and sounding magnetic steel plate are positioned at different locations within the same plane, creating asymmetric magnetic field distribution. This asymmetric positioning allows independent control of functions while preventing magnetic field interference through strategic spatial arrangement.
Solution Approach 2:
The patent transitions from three-dimensional stacking (different planes) to two-dimensional planar arrangement, where all magnetic steel plates are positioned in the same plane but at different locations. This dimensional change eliminates magnetic field interference while maintaining independent control capability through optimized planar positioning.
3Adaptability or versatility
If the number of magnetic steel plates is large, then the sounding unit and motor assembly can be independently controlled, but the volume increases and miniaturization fails
Solution Approach 1:
The patent combines multiple magnetic steel plates into a shared magnetic circuit structure where the motor magnetic steel plate and sounding magnetic steel plate are integrated within the same magnetic circuit. This merging reduces the total number of magnetic steel plates while maintaining independent control functionality, thereby reducing device volume and enabling miniaturization.
Solution Approach 2:
The magnetic circuit system is designed to be universal, serving both the motor assembly and sounding unit with the same magnetic steel plates. This multi-functionality eliminates the need for separate magnetic circuits, reducing the number of components and overall device volume while preserving independent control capabilities.
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 design achieves a smaller overall thickness, enhanced motor driving force, and improved acoustic and vibration performance by optimizing magnetic energy product utilization and reducing magnetic interference.
Implementation Method 1
the coil unit is spaced apart from the magnetic circuit system and drives the magnetic circuit system to vibrate in a second direction
Implementation Method 2
a vibration system and a magnetic circuit system having a magnetic gap respectively fixed to the basin frame. The motor assembly includes a coil unit fixed to the housing, and the coil unit is spaced apart from the magnetic circuit system and drives the magnetic circuit system to vibrate in a second direction
Data Source
AI summary
A multifunctional sounding device is provided, including a housing, a sounding unit, and a motor assembly including a coil unit fixed to the housing. The sounding unit includes a basin frame, a vibration system and a magnetic circuit system, the vibration system is driven by the magnetic circuit system to vibrate in a first direction, the magnetic circuit system is elastically connected to the housing through elastic arms and has a through hole at a central position. The motor assembly is accommodated in the through hole, and the coil unit is spaced apart from the magnetic circuit system and drives the magnetic circuit system to vibrate in a second direction. The multifunctional sounding device has a small overall thickness and size, a strong driving force of the motor assembly and a small influence on the driving force of the magnetic circuit system, and excellent acoustic and vibration performance.