Electromagnetic Sensor Halbach Magnet Arrangement Diaphragm
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Solution Overview
Problem
Existing planar electromagnetic sensors face challenges in achieving uniform diaphragm deformation during vibration, which affects their performance across different frequency responses, leading to suboptimal sound quality.
Innovation Solution
The electromagnetic sensor employs a Halbach magnet arrangement with multiple magnet groups symmetrically disposed on both sides of the diaphragm, enhancing magnetic field intensity and distribution, and includes electrodes supported by modules to optimize magnetic force and frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a planar diaphragm is used in the electromagnetic sensor, then the structure is simple and easy to manufacture, but the diaphragm deformation during vibration is non-uniform, leading to poor sound quality across different frequency responses
Solution Approach 1:
The diaphragm is divided into multiple independent vibration units (first vibration unit, second vibration unit, third vibration unit, fourth vibration unit) with different geometric shapes and sizes. Each unit vibrates independently in response to magnetic field changes, allowing different frequency responses across the diaphragm surface. This segmentation enables uniform overall deformation while maintaining structural simplicity.
2Power
If magnetic field intensity is increased to improve sound quality, then the magnetic power density increases, but the magnetic field distribution becomes non-uniform, affecting frequency response consistency
Solution Approach 1:
Different regions of the diaphragm are equipped with different magnet arrangements tailored to local requirements. The first and second vibration units have magnets arranged to optimize their specific vibration characteristics, while the third and fourth vibration units have different magnet configurations. This local optimization ensures uniform magnetic field distribution across the entire diaphragm while maintaining high magnetic power density in each region.
Solution Approach 2:
The magnet arrangements are deliberately made asymmetric and non-uniform across different regions. The first magnet arrangement differs from the second, third, and fourth arrangements in terms of magnet positions, polarities, and configurations. This asymmetric design compensates for the non-uniform vibration characteristics of different diaphragm regions, achieving overall uniform magnetic field distribution and consistent frequency response.
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 ensures even magnetic field distribution across the electrode, enabling improved sound quality by enhancing magnetic power density and frequency response, resulting in a better sound effect across various frequency ranges.
Implementation Method 1
Halbach magnet arrangement can improve the intensity of magnetic fields and magnetic lines
Implementation Method 2
The first magnet group 20 is defined on a side of the first diaphragm 12... A magnetic axis direction of the first magnet group 20 is indicated by an arrow
Implementation Method 3
When current passes through the electrodes 30, the first diaphragm 12 of the first diaphragm unit 10 and the air surrounding it vibrate and emit sound
Data Source
AI summary
An electromagnetic sensor includes a first magnetic pack unit and a first magnetic unit. The first magnetic unit forms a first magnetic pack, a second magnetic pack, and a third magnetic pack in a first direction. The structure of the electromagnetic sensor enables even and uniform distribution of the magnetic field on the electrode and provides a good sound effect under different frequencies.