01 — Overview
About Radial Multi-pole Ring Magnets
A radial ring is sintered as one body, with its easy axis oriented radially at pressing. Magnetization defines the poles and skew. The documented 10-pole N45SH sample has a trapezoidal OD surface trace; the integrated Halbach sample has a sinusoidal trace. Select the construction against the required field waveform, rotor geometry and assembly conditions, then agree the drawing and inspection method.
02 — Production Capability
What we can hold
- Straight or skewed multipole magnetization; pole count agreed at drawing review
- OD 20 to 75 mm, ID 15 to 68 mm, wall 2 to 7 mm, height 5 to 50 mm; final dimensions per drawing
- ±0.05 mm standard within the documented radial-ring size window; tighter features require drawing review
- Waveform, measurement radius and acceptance limits agreed per program
- Grade and temperature class confirmed for the selected ring geometry
03 — Typical Use Cases
Where Radial Multi-pole Ring magnets go to work
Humanoid robot joint actuators (Figure, Optimus, Digit, Apollo, NEO class)
Collaborative robot joint motors
High-performance servo motors
Premium BLDC motors for e-bikes, power tools, and compact EVs
Surgical robot actuators
High-precision linear motors
04 — Dimensions & Tolerances
Typical Dimensions & Tolerances
| Parameter | Specification |
|---|---|
| Typical dimensions | OD 20 to 75 mm, ID 15 to 68 mm, wall 2 to 7 mm, height 5 to 50 mm; final dimensions per drawing |
| Tolerances | ±0.05 mm standard within the documented radial-ring size window; tighter features require drawing review |
Tighter spec?
These are typical production ranges. Send your drawing with the critical surfaces called out and we will confirm what we can hold against your tolerance stack-up.
06 — Related Applications
Related Applications
Robotics
Radial multi-pole rings, joint-motor magnets, and high-torque servo-motor assemblies for humanoid robots, collaborative robots, and industrial robotic systems.
EV Motors
High-performance NdFeB magnets for electric vehicle traction motors, auxiliary drives, and e-axle systems, with the temperature stability and flux density required for continuous high-torque service.
Industrial Automation
NdFeB magnets for stepper motors, servo drives, linear actuators, magnetic couplings, and factory automation equipment across European and North American manufacturing.
Frequently Asked Questions
What is a radial multi-pole ring magnet?
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It is a one-piece sintered NdFeB ring with radial orientation and alternating poles defined during magnetization. Pole count, skew and the required waveform are part of the drawing review. A radial ring does not automatically produce a sinusoidal field; the documented 10-pole radial sample has a trapezoidal surface trace.
How is a radial multi-pole ring different from a segmented arc assembly?
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A segmented ring uses bonded arc magnets. A radial-oriented ring has one sintered magnetic body, so there are no adhesive joints between magnetic segments. The constructions produce different field waveforms. Compare the field requirement, dimensions, retention design and production quantity before selecting one; a surface scan alone does not establish motor torque ripple.
What is the minimum order quantity for radial multi-pole ring prototypes?
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Prototype quantity and lead time are confirmed after reviewing the drawing, grade, pole pattern and inspection requirements. Include the intended annual volume and requested delivery date with the enquiry so tooling and production options can be reviewed together.
Next step
Request a Quote for Radial Multi-pole Ring Magnets
Share dimensions, quantity, grade, and target application. Our engineering team responds within 1 business day with a grade recommendation, followed by pricing and lead time within 2 business days.