NdFeB magnets in the electroacoustic field are the main topic of this article. This article discusses the detailed advantages of NdFeB magnets in the electroacoustic area, as well as the key process of the quality control of magents.
Definition of Electroacoustic Music
Electroacoustic music, also known as electronic acoustics music, is a broad musical concept that primarily refers to music created through the processing, transformation, and transmission of sound using electronic technology.
Magnetic Flux Density of NdFeB Magnets
Different grades of NdFeB magnets have varying magnetic flux densities. For example, N52 grade neodymium magnets typically have a magnetic flux density of up to 1.44 Tesla (T). In contrast, the magnetic flux density for N35 is around 1.12 T, and roughly 1.25 T for N50.
Reasons for Choosing NdFeB Magnets in the Electroacoustic Field
Magnetic flux density (B) is a crucial indicator of the magnetic performance of permanent materials, representing the magnetic induction strength at a given point for magnets of the same size and voice coil. The performance of the magnet directly affects the sound quality of speakers:
A higher magnetic flux density (magnetic induction strength) B results in a stronger force acting on the diaphragm.
A larger flux density (induction strength) B equates to greater relative power and higher sound pressure level (SPL) sensitivity.
NdFeB Magnets in Loudspeakers
Advantages of NdFeB Magnets in Loudspeakers
NdFeB magnets influence the driving force of the voice coil and its transient response due to their high magnetic energy (BHmax) and coercivity. Their advantages include:
| High Sensitivity: A strong magnetic field enables the voice coil to vibrate more efficiently, reducing power loss and enhancing sound detail reproduction.
| Compact Design: At the same magnetic flux, the volume is only one-fifth that of ferrite, facilitating an optimized speaker structure.
| Low Distortion: High magnetic field uniformity reduces nonlinear distortion, especially evident in dynamic music.
Key Aspects of Quality Control
| Magnetic Circuit Symmetry: Precision machining ensures that the assembly tolerance between the magnet and the magnetic plate is ≤0.05mm, avoiding magnetic field distortion.
| Surface Coating Protection: A dual-layer epoxy nickel-copper plating (thickness ≥15μm) prevents oxidation and corrosion in humid environments, ensuring long-term stability of NdFeB Magnets.
NdFeB Magnets in TWS Earbuds
Advantages of NdFeB Magnets in TWS Earbuds
| Dynamic Units: Reducing the air gap to 0.2mm enhances the magnetic field strength, improving low-frequency response and clarity.
| Planar Diaphragm Headphones: An array of multiple magnets requires ultra-thin magnetic slices (thickness <1mm) to ensure even driving force.
Key Aspects of Quality Control
| Temperature Resistance Design: Adding dysprosium (Dy) doping raises the Curie temperature above 200℃, preventing high-temperature demagnetization.
| Magnetization Uniformity: Multi-pole magnetizing equipment is used to ensure that the difference in magnetic field strength between the edges and center of the mini magnets is <5%.
NdFeB Magnets in Microphones
Advantages of Using NdFeB Magnets
| Pole Head Magnetic System: Provides a constant bias voltage, reducing background noise.
| Electromagnetic Interference Resistance: High coercivity minimizes interference from external magnetic fields, enhancing recording purity.
Key Aspects of Quality Control
| Low Demagnetization Rate Materials: N52 grade NdFeB is selected, with an initial magnetic flux density ≥1.45T, and a decay of <0.5% after 1000 hours of aging testing.
| Integrated Structural Design: The magnet and soft magnetic yoke are laser welded together, reducing magnetic leakage (leakage coefficient <1.1).
NdFeB Magnet Manufacturer
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Image Source: Caribbeanav & Gadgetbreeze & Kesenmagnetics & Ktmagnet & Researchgate
