Speaker Magnetic Assembly Pole Plate Sidewall Design
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Solution Overview
Problem
The existing magnetic assemblies in speakers have a small overlapping area between the yoke and the pole plate, leading to uneven magnetic field distribution and increased total harmonic distortion, resulting in poor speaker performance.
Innovation Solution
The magnetic assembly includes a yoke and a pole plate configuration with an increased overlapping area, where the yoke and pole plate are designed to encase a main magnet and optionally a secondary magnet, ensuring even magnetic field distribution by extending the pole plate's sidewalls to encompass the magnet's outer surface, thereby reducing harmonic distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overlapping area between the yoke and the pole plate is increased, then the magnetic field distribution becomes more even and total harmonic distortion is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The pole plate is nested within the yoke structure, with the pole plate's outer surface positioned within the inner surface of the yoke. This nesting arrangement increases the overlapping area between the yoke and pole plate, improving magnetic field distribution and reducing harmonic distortion while maintaining a compact integrated structure.
Solution Approach 2:
The pole plate extends in the radial direction with its outer surface positioned at a specific distance from the central axis, creating an annular overlapping region with the yoke. This dimensional arrangement maximizes the overlapping area between magnetic components, enhancing magnetic field uniformity without significantly increasing overall device complexity.
2Area of stationary object
If the pole plate's outer surface is positioned closer to the central axis, then the overlapping area with the yoke is increased, but the magnetic gap volume is reduced
Solution Approach 1:
The magnetic assembly utilizes different regions for different functions: the inner region (magnetic gap) accommodates the voice coil for electromagnetic actuation, while the outer region (overlapping area between pole plate and yoke) provides magnetic field distribution. This spatial differentiation allows the pole plate's outer surface to be positioned optimally for maximizing overlapping area without compromising the voice coil assembly space.
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 enhances the magnetic field distribution and reduces total harmonic distortion, improving the overall performance of the speaker by increasing the overlapping area between the yoke and the pole plate.
Implementation Method 1
a speaker includes a magnetic assembly and a voice coil. The magnetic assembly includes a yoke, a magnet installed on the yoke and a pole plate attached to the magnet. A magnetic gap is formed between the yoke and the magnet as well as the pole plate for receiving the voice coil.
Implementation Method 2
The magnetic field is evenly distributed in the magnetic gap between the yoke and the pole plate
Data Source
AI summary
A magnetic assembly for a speaker is disclosed in this disclosure. The magnetic assembly includes a yoke including a receiving space; a main magnet received in the receiving space and installed on the yoke; a pole plate received in the receiving space, and including a base plate attached on the main magnet and a sidewall extending substantially perpendicularly from a periphery of the base plate for increasing an overlapping area between the yoke and the pole plate.