NdFeB arc and segment magnets (tile or shoe magnets) are the core magnetic components of BLDC motors, servo motors, stepping motors, automotive motors and generator rotors. They are sintered, ground on both inner and outer radii, then magnetized radially to produce the required pole distribution on the rotor surface.
Our production covers single-arc and multi-segment configurations, with concentricity and wall-thickness controlled to ±0.05 mm. Arcs can be supplied unmagnetized for easy assembly and magnetized radially, diametrically or as multi-pole patterns after assembly.
Key Specifications
| Specification | Value |
|---|---|
| Grades | N30–N52 with M/H/SH/UH/EH temp series |
| Typical shapes | Arc, segment / tile / shoe |
| Radius tolerance | ±0.05 mm (tightened to ±0.02 mm on request) |
| Magnetization | Radial, diametrical, multi-pole |
| Coatings | Ni, Zn, epoxy, Parylene |
| Applications | BLDC & servo motors, EPS motors, generators |
All magnets are produced to order. Please provide grade, dimension (or drawing), magnetization direction, coating and quantity for quotation. Email sales@polemagnet.com or use the inquiry form — we reply within 24 hours.
FAQ
Sintered NdFeB Arc & Segment Magnets for Motors — FAQ
What pole patterns can you magnetize on motor arc magnets?
Common patterns are 2-pole radial, 4-pole, 6-pole and 8-pole sinusoidal or trapezoidal magnetization. We magnetize arcs using dedicated fixtures so the pole arc ratio and skew angle match your rotor design.
What is the lead time for motor arc magnets?
For existing tooling, 15–20 days after sample approval. New radii require fixture tooling of about 7–10 days before mass production.
Do you provide free samples for testing?
Yes, sample orders are welcome. Send your drawing or specification together with the intended application so our engineers can recommend the correct grade, magnetization direction and coating before we prepare samples.
Can the factory produce to my drawing with special tolerances?
Yes. We machine, grind and inspect to customer drawing tolerances. For sintered NdFeB the standard machining tolerance is ±0.05 mm and can be tightened to ±0.02 mm with diamond grinding where the geometry allows.
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Send your drawing, grade, magnetization direction and quantity. Our engineers will reply with a quotation within 24 hours.