Neodymium Segment Magnets

Neodymium segment magnets are curved permanent magnets manufactured from sintered NdFeB material for applications where the magnet must follow a circular or arc-shaped magnetic path.

They are commonly used in motor rotors, generators, servo motors, BLDC/PMSM motors and other magnetic assemblies. The segment geometry allows multiple magnets to be arranged around a rotor or other curved structure to create the required magnetic circuit.

For OEM projects, the critical specifications are not limited to magnet grade. Segment angle, inner and outer radius, thickness, magnetization direction, dimensional tolerances, operating temperature and surface protection all need to match the application.

We manufacture custom NdFeB segment magnets according to drawings, dimensions and magnetic requirements.

Electric Motors: Custom NdFeB segments are used in permanent-magnet motor rotors where high magnetic energy density is required within a compact motor structure.

Servo Motors: Segment magnets can be manufactured to the rotor geometry and magnetic configuration required for precision motion systems.

BLDC and PMSM Motors: The curved geometry allows magnets to be arranged around the rotor while maintaining the required pole structure.

Automotive and EV Systems: NdFeB motor segments can be used in traction motors and other automotive electric drive systems where magnetic performance and temperature capability are critical design parameters.

Generators: Segmented NdFeB magnets can be incorporated into generator rotors for applications requiring high magnetic energy density.

Industrial Automation and Robotics: Custom motor magnets are used in servo drives, actuators and robotic motion systems where compact motor construction and repeatable magnetic performance are important.

Motor magnets are one of the main applications for NdFeB segment geometry. The magnets can be positioned around a rotor to create the magnetic field required for torque generation and motor operation.

The required magnet design depends on the motor architecture, pole count, rotor diameter, air gap, working temperature and magnetic circuit. For this reason, motor magnet orders are normally handled from engineering drawings or detailed technical specifications rather than from a generic catalogue dimension.

Powder Processing: NdFeB raw materials are processed into magnetic powder with the required material composition and performance characteristics.

Press Forming and Magnetic Orientation: The powder is compacted into the required shape while magnetic orientation is controlled according to the material and magnetization design.

Sintering: The compacted material undergoes high-temperature sintering to obtain the required density and magnetic structure.

Machining and Grinding: After sintering, the magnet can be ground or machined to achieve the specified segment dimensions, radii, thickness and tolerances. Curved geometries require particular attention to profile consistency because dimensional variation can affect rotor assembly.

Surface Treatment: The finished magnet can receive the specified protective coating according to the environmental and assembly requirements.

Magnetization: The finished components are magnetized according to the approved magnetization direction and magnetic configuration.

Inspection: Finished magnets can be checked for magnetic properties, dimensions, surface condition and other specified requirements before shipment.

Our existing NdFeB manufacturing system includes powder processing, press forming, sintering, precision machining and inspection for magnetic and dimensional consistency.

For segment magnets used in motors and other assemblies, quality control should cover more than appearance. Typical inspection items include:

Magnetic Properties: Br, Hcb, Hcj, BHmax, flux/Gauss where specified, magnetic polarity, magnetization consistency.

Dimensional Inspection: Inner radius/diameter, outer radius/diameter, arc angle, thickness, length, surface dimensions, drawing tolerances.

Surface Inspection: Coating coverage, surface defects, chips and cracks, corrosion or oxidation, coating adhesion where required.

For volume production, maintaining consistency between batches is particularly important because variations in individual segments can affect the final magnetic assembly.

Because sintered neodymium segment magnets feature high magnetic energy and mechanical brittleness, proper logistics protection is essential for international shipments:

Magnetic Shielding: Packaging materials and iron sheets are utilized when necessary to contain stray magnetic fields and comply with air/sea transport safety regulations.

Individual Separation & Cushioning: Custom foam inserts and physical spacing prevent segments from colliding, chipping, or fracturing during transit.

Moisture Barriers: Vacuum-sealed bags with desiccants protect coated magnets (especially Ni-Cu-Ni or zinc surfaces) from oxidation and humidity during ocean freight.

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