1. Product Overview
Magnetic rings are annular permanent magnets with a closed magnetic circuit structure. They are widely used in applications requiring uniform magnetic fields or axial/radial magnetism. With excellent magnetic properties, structural stability, and machining adaptability, they are key components in high-precision electromechanical systems, inductive devices, and electronic assemblies. Compared to other magnet shapes, the magnetic ring offers better integration and concentrated magnetic flux, improving system efficiency.
2. Technical Parameters
- Product Name: Magnetic Ring
- Magnet Grade: (Max Br ≥ 13.8 kGs, Max Hcj ≥ 10.8 KOe)
- Dimensions:D15x6x3mm
- Tolerance: ±0.05 mm (Length × Width × Thickness)
- Operating Temperature: ≤ 80°C (High-temp options available)
- Density: ≥ 7.5 g/cm³
- Surface Magnetic Field: 4500 Gauss
- Magnetic Flux: 1.80 mWb (measured by fluxmeter)
3. Manufacturing Process
The product is manufactured through the following key processes:
Wire Cutting: Uses molybdenum/copper wire cutting equipment to achieve ±0.02mm precision for small-batch custom rings.
Centerless Grinding: Refines inner and outer diameters to ensure roundness (±0.05mm tolerance).
Double-Disc Grinding: Controls thickness and parallelism.
4. Surface Treatment & Coating Technology
- Copper Undercoating: Enhances adhesion and fills micro-porosity.
- Ni-Cu-Ni Coating: A three-layer plating that improves rust, corrosion, and abrasion resistance.
- Epoxy Coating: Black or gray finish; enhances thermal resistance and is suitable for humid or chemical environments.
5. Appearance & Dimensional Inspection Standards
- Manual measurement using micrometer/caliper
- Visual inspection under 800–1200 lumens
- 2D optical inspection for non-standard shapes
- CCD auto-sorting and full appearance/dimensional check
- Magnetic flux testing to ensure magnetic consistency
6. Reliability Testing
-Thermal Shock Cycling Test:
Evaluates the structural integrity and coating adhesion of magnets under extreme temperature fluctuations.
- Magnetic Performance Consistency Test:
Uses a Gaussmeter to verify the uniformity of surface magnetic field, remanence, and magnetic flux across different production batches, ensuring minimal performance deviation that could affect final assembly or operational stability.
-Tensile/Adhesive Strength Test:
Applicable to applications involving adhesive bonding or magnet assemblies. A tensile testing machine measures the maximum force required to peel the magnet off its bonded substrate, ensuring reliable adhesion against vibration or aging effects.
7. Packaging Process & Instructions
Items with cosmetic or dimensional defects are eliminated through strict inspection
Qualified units are magnetized in batches and arranged in order
Packed per client specifications with customized labeling
Each unit is vacuum-packed with magnetic shielding and shockproof padding for enhanced protection
8. Application Fields
- Motor Systems: Brushless, stepper, and servo motors
- Sensor Components: Hall sensors, encoders, displacement detectors
- Medical Devices: MRI systems, electromagnetic clamps
- Consumer Electronics: Magnetic connectors, wireless charging rings
- Industrial Automation: Magnetic coupling systems, transmission parts
- New Energy: EV drives, wind power generators
9. Usage Precautions
- Avoid impact or dropping; NdFeB is brittle
- Use sliding motion to separate to avoid pinching
- Install with correct polarity to ensure device stability
- Store away from heat, humidity, and corrosive environments
- Keep away from sensitive electronics (pacemakers, hard drives, IC cards)
10. Customization & Services
- Customizable parameters: dimensions, shape, magnetization direction, coating thickness
- Optional laser marking for logos or serial numbers
- Support for sample testing, pull-force testing, and packaging solutions
We are delighted to provide complimentary customized magnet solutions designed to meet your unique requirements.
Should you need samples, technical specifications, or certifications such as MSDS, RoHS, ISO 9001, QC080000, IATF 16949, ISO 14001, or ISO 27001, our dedicated sales engineers are here to support you every step of the way.
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