Hot-pressed NdFeB Magnet
热压钕铁硼磁体
Hot-pressed NdFeB radial rings are anisotropic rings formed by high-temperature compaction and extrusion of rapid-quenched NdFeB magnetic powder.
They achieve high magnetic energy product while maintaining strong coercivity, making them ideal for compact, high-torque motor applications. Radial orientation allows single-pole, multi-pole, and skewed magnetization patterns with uniform magnetic properties and minimal non-magnetic zones for smoother, quieter torque output.
Rings can be magnetized via coils without splicing — simple installation, high precision, and excellent batch-to-batch consistency.
Key Features
High Performance
High (BH)max with strong coercivity — ideal for small-volume, high-torque motors.
Radial Orientation
Magnetized in any radial direction: single-pole, multi-pole, or skewed pole patterns.
Uniform Field
Consistent magnetic properties and small non-magnetic zones for smooth, quiet torque.
Easy Assembly
Coil magnetization without splicing — precise fit and excellent consistency.
Ring Structure
- ConstructionOne-piece sintered ring — no glued arc segments
- OrientationRadial anisotropy across the full circumference
- Field profileNear-sinusoidal Br for low cogging & quiet running
Production Process
A 12-step route from rapid-quenched powder to a magnetized, inspected ring.
- 1Rapid-quenching
- 2Powder mixing
- 3Pressing GHM I (room temp.)
- 4Pressing GHM II (medium temp.)
- 5Pressing GHM III (high temp.)
- 6GHM3 blank
- 7Trim top & bottom
- 8Machine I.D. / O.D.
- 9Coating (spray / electrodeposition)
- 10Magnetizing
- 11OQC inspection
- 12Packaging
Magnetization Methods
Hot-pressed NdFeB rings can be magnetized with any number of poles in the radial direction, including oblique (skewed) pole patterns.
Skewed multi-pole
Diagonal pole arrangement along the axis to reduce cogging torque.
Multi-pole (O.D. / I.D.)
Alternating N/S poles distributed around the circumference.
Radial orientation
Single radial pole pair — N on O.D., S on I.D.
Uniform Field Distribution
Continuous radial orientation yields a near-sinusoidal surface field with small non-magnetic transition zones — the key to smooth, quiet motor torque.
Typical Applications
Product Manual
Hot-pressed NdFeB Magnet Product Manualhot-pressed-ndfeb-magnet.pdfDownload PDFNeed a Custom Ring?
We can tailor grade, dimensions, pole count, skew angle, and coating to your motor design — contact our engineering team for samples and DFM support.
Discuss Custom Requirements