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 · Drawing review
Drawing review and documented scope
- 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
Robot joint actuators
Collaborative robot joint motors
Servo motors
BLDC motors
Surgical robot actuator design studies
04 · Dimensions & Tolerances
Drawing dimensions and 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?
Send your drawing with the critical surfaces called out. We will confirm the dimensions, production route and inspection requirements for your part.
06 · Related Applications
Related Applications
Robotics
NdFeB design inputs for robot joint motors, compact actuators and servo drives.
EV Motors
NdFeB magnet design inputs for permanent-magnet traction motors, auxiliary drives and e-axles.
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 target and operating conditions. We respond within 1 business day. The production route and acceptance requirements are confirmed during drawing review.