Neodymium Segment Magnets
Neodymium segment magnets, also known as arc magnets or curved magnets, are specially designed rare earth magnets with a curved geometry. They are widely used in electric motors, wind turbines, magnetic couplings, generators, sensors, loudspeakers, and high-performance industrial assemblies where radial magnetic fields are required.
We manufacture custom segment magnets with high magnetic strength, precise dimensional tolerance, and reliable coating options for demanding industrial applications.
What Is a Neodymium Segment Magnet?
A neodymium segment magnet is a curved or arc-shaped magnet made from sintered NdFeB material. Compared with block or rectangular magnets, segment magnets are specially designed to fit circular structures such as rotors, stators and magnetic rings.
Because of their high magnetic energy, compact size and excellent performance-to-weight ratio, NdFeB segment magnets are commonly used in applications where strong magnetic fields are required in limited space.
Typical names include:
- Neodymium segment magnet
- NdFeB arc magnet
- Arc segment magnet
- Curved neodymium magnet
- Motor segment magnet
- Rare earth segment magnet
- Rotor arc magnet
Key Features of Segment Magnets
Extremely Strong Magnetic Force
NdFeB segment magnets provide exceptional magnetic energy, making them ideal for compact and high-efficiency motor systems.
Curved Geometry for Radial Magnetization
The arc shape enables optimized magnetic field distribution in rotating equipment and ring assemblies.
Customizable Dimensions
Available in different:
- Inner radius (IR)
- Outer radius (OR)
- Thickness
- Arc angle
- Segment quantity
Multiple Magnetization Directions
We support:
- Radial magnetization
- Diametrical magnetization
- Axial magnetization
- Multi-pole magnetization
High Temperature Grades Available
Suitable for demanding environments with operating temperatures up to 220°C depending on grade selection.
Custom Segment Magnet Manufacturer
We provide OEM and custom manufacturing services for global industrial customers.
Customization Options
- Custom arc angles
- Special tolerances
- Multi-pole magnetization
- Complex rotor assemblies
- High-temperature grades
- Special coatings
- Adhesive bonding solutions
Manufacturing Capabilities
- Precision grinding
- Wire cutting
- CNC machining
- Advanced magnetization systems
- Full magnetic testing
Quality Control
Every batch undergoes:
- Flux testing
- Gauss measurement
- Coating inspection
- Dimensional verification
- Salt spray testing
Segment Magnet Specifications
| Parameter | Range |
|---|---|
| Material | NdFeB / Rare Earth |
| Shape | Segment, arc, curved block, motor arc magnet |
| Grade | N35–N55, M/H/SH/UH/EH |
| Size | Custom |
| Magnetization | Radial, thickness, parallel, diametrical or customized pole direction |
| Coating | Ni-Cu-Ni, zinc, epoxy, phosphate, black epoxy, parylene or custom coating |
| Tolerance | ±0.05 mm or customized |
| Max Temp | Up to 220°C |
Segment Magnet Applications
Electric Motors
Segment magnets are extensively used in:EV motors, BLDC motors, servo systems, industrial drive motors.
Wind Turbines
High-performance arc magnets improve generator efficiency and energy output.
Magnetic Couplings
Used for non-contact torque transmission in pumps and sealed systems.
Audio Equipment
Applied in premium loudspeakers and acoustic devices.
Robotics & Automation
Enable compact and efficient motion control systems.
Why Choose Us as Segment Magnets Supplier
Stable Magnetic Performance
Consistent flux density and high coercivity for long-term reliability.
Industrial-Grade Precision
Strict dimensional tolerances for rotor balancing and assembly accuracy.
OEM & Bulk Supply
Flexible production for prototypes, low MOQ orders, and large-volume industrial projects.
Export Experience
Serving customers in: USA, Germany, Italy, South Korea, India, Brazil, Southeast Asia.
Frequently Asked Questions
Yes. We can manufacture custom NdFeB segment magnets based on your drawing, sample or technical requirements.
The best grade depends on working temperature, magnetic force requirement, demagnetization risk, coating, size and application. For motor use, high-coercivity grades such as H, SH, UH or EH may be required.
Yes, radial or thickness magnetization is commonly used for motor segment magnets. Please provide your magnetization direction drawing for confirmation.
Ni-Cu-Ni, epoxy and phosphate coatings are commonly used. Epoxy and phosphate are often selected for motor assemblies where corrosion resistance and bonding performance are important.
Yes. We can supply segment magnets in matched sets with polarity marking and separated packing to support rotor assembly.
Yes. Sample production is available for custom neodymium segment magnets. Lead time depends on size, grade, coating and tooling requirements.
Request a Quote
Looking for a reliable segment magnet supplier for motors, generators, or industrial assemblies? Send us your drawing, sample or project requirements today. Our team will help you select the right NdFeB grade, coating, magnetization direction and production solution for your application.