Strong magnetic force Black Epoxy Coated Arc Segment Neodymium Magnet

Strong magnetic force Black Epoxy Coated Arc Segment Neodymium Magnet

1. Product Introduction and Application fields

Precision customized strong magnetic force black epoxy coated small arc segment neodymium magnet is engineered for high-efficiency motors and precision-driven systems. Manufactured from premium-grade rare-earth materials, heat resistance strong magnetic force black epoxy coated stable small arc segment neodymium magnet delivers exceptional magnetic energy density (up to 52 MGOe) with excellent thermal stability and corrosion resistance. The black epoxy coating ensures long-term durability, even in humid or salt-spray-prone environments. Common applications include BLDC motors, servo motors, wind turbines, EV drive systems, and industrial automation.

Motor and Generator Applications

High magnetic strength black epoxy coating high torque arc segment neodymium magnet is designed to closely fit the inner wall of the stator, enhancing magnetic field strength and improving motor efficiency. Its coating provides excellent corrosion resistance, making it ideal for high-humidity and salt-spray environments, ensuring long-term stable operation.

Home Appliance Applications

Widely used in motor systems of washing machines, air conditioners, and vacuum cleaners, this magnet helps improve energy efficiency (e.g., achieving China’s Level 1 energy rating) while ensuring long-term reliability and low maintenance under high-temperature and humid conditions.

2.Technical Specifications

Product Name: Strong magnetic force Black Epoxy Coated Arc Segment Neodymium Magnet

Magnet Grade: N48 (Br ≥ 14.8 KGs, Hcj ≥ 10.5 KOe) — Customized

Dimensions: D8-D10×4 mm

Tolerance: ±0.05 mm (Length, Width, Thickness)

Operating Temperature: ≤ 80°C (Customized 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)

3. Surface Treatment & Coating Technology

- High-Precision Bonding: The use of flexible epoxy adhesive enhances the bonding strength of the magnets.
-In-line Magnetic Field Compensation: During the assembly process, the magnetic field is measured in real time, and positional adjustments of the magnetic segments are made to compensate for deviations

4. Appearance and Dimensional Inspection

Visual Inspection: Under standardized lighting, trained QC staff check for cracks, chipping, inclusions, pores, or oxidation.

Automated Intelligent Inspection: High-speed cameras with AI algorithms detect and reject defects (e.g., cracks, scratches, discoloration) and dimensional anomalies, improving yield and reducing human error.

5. Reliability Testing

Magnetic Performance Testing:

- Magnetic Field Strength Test: Measures field strength at multiple points to ensure compliance with specifications.

- Magnetic Stability Test: Assesses changes in magnetic properties after prolonged exposure to various temperature and humidity conditions.

Physical Performance Testing:

- Hardness Test: Uses Rockwell or Vickers hardness testers to ensure wear resistance.

- Density Test: Evaluates structural uniformity and compaction via density measurement.

- Dimensional Accuracy Measurement: Ensures tolerances using calipers and micrometers.

6.Packaging & Transportation

Defect Elimination:
100% inspection using calipers, projectors, visual checks, and automation to reject magnets with cracks, chips, oxidation, or coating defects.

Consistent Magnetization & Arrangement:
Magnets are uniformly magnetized and arranged per customer requirements to ensure performance and enable automated assembly.

Vacuum Packaging:
Multi-layer vacuum sealing with moisture barriers, desiccants, or nitrogen prevents corrosion and magnetic interference during storage and transport

7. FAQ

Q. Why choose epoxy coating for magnets?

Corrosion Resistance: Epoxy coating isolates the magnet from moisture, air, and salt spray—ideal for harsh environments like coastal areas or high humidity zones.

High Temperature Tolerance: Epoxy coatings typically withstand up to 200–380 °C depending on the formula and thickness.

Q.What is the typical thickness and color of the coating?

Thickness: Usually ranges from 10 to 30 μm.

Color: Standard is black, but custom colors like gray, red, or green are available for identification or aesthetic purposes.

Q.How does it compare to nickel or zinc coatings?

Epoxy is lighter, non-metallic, and chemically resistant.

Unlike Ni-Cu-Ni or Zn plating, it’s non-conductive, ideal for applications where magnetic isolation and low eddy current loss are important.

8. Why Choose Us ?

✅ 20+ Years of Magnet Manufacturing Expertise – From concept to mass production

✅ High Consistency Guaranteed – Batch-level QC with full magnetic test reports

✅ Strong Customization Capabilities – Tailored shapes, coatings, and magnetization directions

✅ Certified for Global Compliance – RoHS, REACH, and optional SGS/TÜV certificates

✅ Responsive Multilingual Team – Sample quotation within 48 hours

9. Usage Precautions

Handle gently: Avoid impacts/drops (brittle material).

Prevent pinching: Slide magnets apart—do not pry.

Polarity check: Install correctly to avoid malfunctions.

Avoid moisture/acids: Store in dry, mild environments.

Keep away from sensitive devices: Hard drives, IC cards, pacemakers, etc.

10.Customization & Services

Custom magnet size, shape, and coating (layers, thickness, color)

Tailored magnetization direction and field strength

Laser engraving service for logos or serial numbers

Packaging and suction force testing for special applications

Contact Us
 Phone/WhatsApp/WeChat: +86 13829120676

 Email: Info@jinconn.com

 Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province, China