Product Overview
This high remanence shaped magnet is engineered for precision and efficiency. Its unique geometry ensures stable magnetic field distribution, making it ideal for compact and complex assemblies. In smart speaker applications, the triangular design enhances acoustic performance by improving driver stability and magnetic efficiency, resulting in clearer sound and reduced distortion. Its distinctive form also allows flexible integration into innovative product designs. Combining high magnetic strength with tailored shape, this high remanence shaped magnet delivers superior performance for next-generation smart speaker systems.
Application Fields:
This product is widely used in:
- Smart wearable devices: Magnetic structures for smart bands, earbud positioning, electric toothbrush chargers.
Audio equipment: Speaker and headphone magnetic circuits (Hi-Fi systems, TWS earbuds).
- Industrial applications: Motor cores, sensors, braking systems in power tools.
Technical Specifications
|
Product Name |
high remanence shaped magnets |
|
Magnet Grade |
N35 (Br ≥11.8 kGs, Hcj ≥12 kOe) |
|
Dimensional Tolerance |
+/-0.05 |
|
Operating Temperature |
≤80°C (High-temp versions available) |
|
Density |
≥7.5 g/cm³ |
|
Surface Magnetic Field |
3,500 Gs |
|
Magnetic Flux |
2.0 mWb (Fluxmeter-tested) |
Manufacturing Process
Magnetic Alignment and Compaction
Under a strong external magnetic field, the fine powder is compacted using axial or isostatic pressing. This process aligns the magnetic grains along a preferred orientation, significantly enhancing the magnet's anisotropic properties and energy density.
Vacuum Sintering
The compacted parts are sintered at high temperatures in a vacuum furnace, allowing the powder particles to bond metallurgically and reach near-theoretical density. This step plays a decisive role in determining the final magnetic strength and mechanical integrity.
Controlled Heat Treatment
Post-sintering heat treatment is carefully applied to optimize the microstructure, stabilize magnetic properties, and enhance resistance to demagnetization, particularly in high-temperature operating environments.
Reliability Testing
To validate coating integrity and long-term performance, NdFeB magnets are subjected to systematic reliability testing throughout the production cycle.
Visual and Dimensional Inspection:
Surface condition and dimensional accuracy are verified under controlled lighting using calibrated measurement tools and optical inspection systems.
Coating Evaluation:
Testing includes coating thickness measurement, adhesion testing, and cross-hatch evaluation to ensure coating uniformity and durability.
Environmental Resistance Testing:
Magnets undergo salt spray, humidity, and thermal exposure tests to assess corrosion resistance and coating stability under simulated service conditions.
Magnetic Stability Testing:
Magnetic properties are measured before and after environmental and thermal testing to verify resistance to demagnetization and performance degradation.
Packaging & Transportation
Defect Sorting:
Visual and dimensional defects are removed before final packing
Magnetizing & Arranging:
Each magnet is uniformly magnetized and packed as per customer requirements.
Vacuum Packaging:
Prevents moisture and magnetic interference during shipping and storage.
Outer Packaging:
Shock-resistant, moisture-proof, and anti-magnetic interference packaging ensures safe transportation. Outer packaging is reinforced with impact-resistant materials, moisture protection, and clear labeling. For international shipments, packaging is designed to meet IATA, IMDG, and standard freight regulations where applicable.
FAQ
Q1. How is magnetic flux loss quantitatively measured after reliability testing?
Magnetic flux loss is measured using calibrated flux meters or Helmholtz coil systems. Measurements are taken before and after reliability tests, and percentage loss is calculated to distinguish reversible and irreversible demagnetization.
Q2. What temperature ranges are typically used for high-temperature aging tests?
High-temperature aging tests are commonly conducted between 100°C and 200°C, depending on magnet grade and application requirements. Automotive-grade magnets may be tested at even higher temperatures to ensure safety margins.
Q3. How do you differentiate reversible and irreversible demagnetization during testing?
Magnets are re-magnetized after thermal exposure. Any magnetic performance loss recovered after re-magnetization is classified as reversible, while remaining loss is considered irreversible.
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