Speaker Magnetic Gap Structure for Higher Driving Force
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Solution Overview
Problem
Existing speaker designs have excessive voice coil wall thickness, leading to large magnetic gaps and insufficient driving force, which affects acoustic performance.
Innovation Solution
A speaker design with a magnetic circuit system featuring staggered projecting portions in the magnetic gap, including a main magnetic steel, a sub-magnetic steel, and an upper clamp plate, to reduce the localized magnetic gap and enhance driving force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the voice coil wall thickness is increased, then the structural strength is improved, but the magnetic gap becomes larger resulting in insufficient driving force
Solution Approach 1:
The magnetic circuit system employs different magnetic steel configurations at different locations: the main magnetic steel is affixed to the magnetic bowl while the sub-magnetic steel is spaced apart, creating a localized magnetic gap structure. This allows the magnetic gap to be optimized locally rather than uniformly, enabling sufficient driving force while accommodating the voice coil's structural requirements
Solution Approach 2:
The patent introduces a spatial dimension by positioning the sub-magnetic steel at a distance from the main magnetic steel, creating a three-dimensional magnetic gap structure. The voice coil is suspended within this spatial gap, allowing optimization of both structural strength and magnetic interaction through spatial arrangement rather than just dimensional scaling
2Ease of manufacture
If the magnetic gap is enlarged to accommodate the voice coil, then the voice coil can be installed, but the driving force becomes insufficient
Solution Approach 1:
Instead of uniformly enlarging the entire magnetic gap, the patent creates a specific localized gap structure between the main magnetic steel and sub-magnetic steel. This localized approach provides just enough space for voice coil installation while concentrating the magnetic field where needed to maintain sufficient driving force
Solution Approach 2:
The sub-magnetic steel acts as an intermediary element that mediates between the main magnetic steel and the voice coil. It creates the necessary installation space while still participating in the magnetic circuit, allowing the voice coil to be installed without completely sacrificing magnetic field strength
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 increases driving force and output sensitivity by optimizing the magnetic gap configuration.
Implementation Method 1
a voice coil suspended in the magnetic gap and configured to drive the diaphragm to vibrate
Implementation Method 2
a magnetic gap is formed in a space between the main magnetic steel and the sub-magnetic steel
Data Source
AI summary
The present application provides a speaker including a basket frame, a magnetic circuit system and a vibration system. The magnetic circuit system includes a magnetic bowl, a main magnetic steel, and a sub-magnetic steel spaced apart from the main magnetic steel, with a magnetic gap formed in the space between the main magnetic steel and the sub-magnetic steel. The vibration system includes a diaphragm, and configured to drive the diaphragm to vibrate. The voice coil includes a first main body and a first projecting portion. The sub-magnetic steel includes a second main body and a second projecting portion. The first projecting portion and the second projecting portion are arranged staggeredly in the magnetic gap. The sub-magnetic steel is provided with localized projecting portions within the magnetic gap to reduce the localized magnetic gap to increase the driving force of the speaker and provide a greater output sensitivity.