Custom Poles Bonded NdFeB Ring for DC Motor Encoder
| Material | Bonded NdFeB Magnetic Material (isotropic /anisotropic) |
| Grade | BNP6, BNP8L, BNP10, etc |
| Max operating temperature | 100℃, 120℃, special grades up to 150℃ |
| Size | Customized according to customer drawings |
| Shape | Block, cylinder, ring, arc, segment, special-shaped multi-pole ring, etc. |
| Size tolerance | Injection molding ±0.01~0.05mm, compression molding ±0.05~0.1mm |
| Density | 5.8~6.2 g/cm³ |
| Br | 0.50~0.72 T |
| Hcj | 500~900 kA/m |
| (BH) max |
40~95 kJ/m³ |
Bonded NdFeB magnets are permanent magnets made by mixing melt-spun or HDDR NdFeB magnetic powder with polymer binders, then formed through compression or injection molding and curing.
Without high-temperature sintering, they enable near-net-shape forming with high dimensional accuracy, suitable for complex shapes and large-scale automatic production, widely used in precision motors, sensors, automotive electronics and various miniaturized magnetic components.
Compression Bonded
Mixed with magnetic powder and a small amount of epoxy resin, cold-pressed and then cured at low temperature, it has better magnetic performance and higher density. Suitable for mass production of conventional shapes (block, cylinder, ring, arc, etc.) with high cost performance, it is the most in-demand type in the current market.
Injection Bonded
Mixed with magnetic powder and nylon or other plastic matrices, injection-molded by an injection molding machine, it has extremely high dimensional accuracy (±0.01mm), and can process complex structures, thin-walled, special-shaped parts and integrated products with inserts, adapting to high-end precision scenario needs.
1.Shape
We produce various shapes, including blocks, cylinders, discs, rings, arcs, segments, special-shaped multi-pole rings (ideal for motor rotors), and complex parts with steps, bosses or snap-fit structures.
2.Magnetization Direction
Supports high-precision magnetization in full directions, including single-pole, multi-pole, skew-pole and radiating patterns. Uniform and stable magnetic poles without weak poles or magnetic flux leakage. Suitable for high-precision magnetic field requirements of motors, sensors and encoders. Customizable magnetization solutions available according to customer waveform requirements.
3.Surface Treatment
Black epoxy coating (most commonly used)
Zinc plating
Phosphating / Passivation
Parylene coating (for high-end precision parts)
4.Application Fields
Micro stepping motors, brushless motors, servo motor rotors；
Automotive electronic sensors, oil pump motors, window regulators；
Hard disk drives, consumer electronics, precision instruments；
Smart home, medical equipment, fitness equipment magnetic components；
Various precision transmission, positioning and induction magnetic components.
5.Quality & Certification
-Products comply with RoHS and REACH environmental requirements
-Material certificate, magnetic property test report, SDS and other documents are available
-Full or sampling inspection on dimension, magnetic properties and coating adhesion to ensure batch stability
How to get a best quote?
After confirming the above details or if you have any futher questions, we would love to receive your email or messages. We will calcualte the price ASAP according to your order/sample quantity,and respond to your concerns.
