Product Overview
Engineered for durability and precision, our high stability small lightweight black epoxy coating sintered ring magnet is designed to deliver stable magnetic performance in demanding industrial environments. Manufactured with high-quality ferrite material and coated with a corrosion-resistant black epoxy, these magnets combine strong magnetic force with long-term reliability.
Key Features
High Magnetic Stability:
Consistent performance for positioning, holding, and inductive applications.
01
Durable Epoxy Coating:
Protects against moisture, chemicals, and mechanical wear.
02
Precise Dimensions:
Machined to tight tolerances for easy integration into assemblies.
03
Low Magnetic Loss:
Excellent for long-term static and dynamic magnetic field use.
04
Custom Sizes Available:
Inner/outer diameter and thickness can be tailored to your needs.
05
Technical Specifications
|
Product Name |
Black epoxy coated ring magnets |
|
Magnet Grade |
N45 (Br ≥ 14.8 KGs, Hcj ≥ 10.5 KOe) - Customizable |
|
Dimensions |
D12 - D10 x 5 mm |
|
Tolerance |
±0.05 mm (Length, Width, Thickness) |
|
Operating Temperature |
≤ 80°C (Customizable high-temp versions available) |
|
Density |
≥7.5 g/cm³ |
|
Surface Magnetic Field |
2400 Gauss (Measured using Japan TM-801 Gauss meter) |
|
Magnetic Flux |
2.2 mWb (Measured; value varies by material grade) |
Manufacturing Process of NdFeB Magnets
NdFeB magnets are produced through a highly controlled powder metallurgy process. High-purity rare earth materials are melted and processed into ultra-fine powder. The powder is magnetically aligned and compacted, followed by sintering to form a dense and high-performance magnet. Subsequent machining ensures tight dimensional tolerances, while protective surface coatings enhance corrosion resistance. Final magnetization and inspection guarantee stable magnetic performance and product reliability.
Automated Intelligent Inspection
High-speed imaging systems paired with AI detection algorithms continuously scan for flaws-including cracks, scratches, discoloration, and dimensional deviations-automatically removing defective pieces to enhance accuracy and reduce manual inspection errors.
Packaging & Transportation
- Inspect magnets for surface defects, coating integrity, and dimensional conformity prior to packaging.
- Apply anti-rust treatment or protective oil if required by specification.
- Separate magnets using plastic spacers or foam sheets to prevent direct contact and collision.
- Wrap individual units or stacks with protective material (plastic film or bubble wrap).
- Pack magnets into inner cartons with sufficient cushioning to eliminate movement.
- Place inner cartons into outer cartons, reinforced to withstand magnetic force and transport stress.
- Clearly label cartons with magnetic warnings, polarity marks, and handling instructions.
Application Fields
▲ Inductors & Transformers
Application: Commonly used in toroidal cores for chokes, common mode inductors, and EMI filters.
▲ Sensors & Magnetic Encoders
Application: Used in Hall sensors, rotary encoders, and angular position feedback systems.
● Magnetic Couplings & Mounting Systems
Application: Applied in magnetic mounts, rotating couplers, and quick-lock assemblies.
● Consumer Electronics & Smart Devices
Application: Used in magnetic accessories, wireless charging bases, and compact enclosures.
Customization & Services
We provide comprehensive customization solutions tailored to demanding applications. Magnet dimensions, geometries, and surface treatments can be precisely engineered, including multi-layer coatings with controlled thickness and color options, to meet both functional and aesthetic requirements.
Our advanced magnetization capabilities allow for highly accurate orientation control and flexible adjustment of magnetic field strength, ensuring optimal performance in complex assemblies and high-precision systems.
To support identification and traceability, optional laser marking services are available for logos, part numbers, serial codes, or customer-specific markings.
In addition, we offer application-specific packaging solutions and rigorous pull-force testing, designed to validate performance, enhance handling efficiency, and protect product integrity throughout transportation and use.
FAQ
Q1. Why are NdFeB magnets sensitive to ultrasonic cleaning?
Answer:Ultrasonic energy can induce microcracking and delamination in brittle NdFeB materials, especially if the coating adhesion is weak or the magnet has sharp edges.
Q2. How does magnet mass variation affect dynamic balance in rotating systems?
Answer:Mass variation causes imbalance at high rotational speeds, increasing bearing load and vibration. Tight mass control is critical for rotors and high-speed motor applications.
Q3. Why is magnet coercivity margin more important than maximum energy product in real designs?
Answer:High (BH)max does not guarantee stability. Adequate coercivity margin ensures resistance to demagnetizing fields, temperature excursions, and assembly stress, preventing irreversible performance loss.
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