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ndfeb ring magnet

Engineered for applications requiring optimized magnetic field geometries, our NdFeB ring magnets provide efficient magnetic flux management through their annular design. These neodymium ring-shaped magnets are specifically designed for motors, sensors, encoders, and audio equipment where their toroidal configuration enables compact magnetic circuit designs and space-efficient integration. Available in various grades from N35 to N52 and multiple magnetization patterns (axial, radial, multipole), each NdFeB ring magnet is manufactured with precision dimensional control, uniform magnetic field distribution, and robust protective coatings suitable for demanding operational environments.

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Product Description

NdFeB Ring Magnets | High-Performance Neodymium Ring Magnets for Motors & Sensors

NdFeB Ring Magnets: Precision Engineered Neodymium Ring Magnets for Advanced Applications

Outer Diameter (OD)

3mm - 150mm

Inner Diameter (ID)

1mm - 120mm

Thickness (Height)

1mm - 50mm

Concentricity

≤0.05mm

Magnetization Options for Ring Magnets

Axial Magnetization: Magnetic poles on the top and bottom faces (through thickness). Ideal for axial flux motors, magnetic couplings, and holding applications where magnetic field is perpendicular to mounting surface.

Radial Magnetization: Magnetic poles on the inner and outer cylindrical surfaces. Preferred for brushless DC motors, servo motors, and rotary encoders where magnetic field is parallel to rotation axis.

Multipole Magnetization: Multiple north-south pole pairs around circumference. Used in stepper motors, precision positioning systems, and encoder wheels requiring precise angular resolution.

Engineering Advantages of Ring Magnet Geometry

Optimized Magnetic Circuit Design

The annular geometry of NdFeB ring magnets creates naturally focused magnetic fields with minimal stray flux, making them ideal for applications requiring precise field control. The hollow center reduces material usage while maintaining effective magnetic volume, and allows for shaft or component mounting through the center. This design is particularly advantageous in motor applications where the ring magnet can be mounted directly on rotor shafts, creating efficient air gap magnetic fields with minimal magnetic circuit losses.

Precision Dimensional Control

Manufacturing consistent NdFeB ring magnets requires specialized tooling and process controls to maintain concentricity (typically ≤0.05mm), parallel faces, and precise inner/outer diameter relationships. Our CNC-controlled diamond grinding and slicing equipment maintains dimensional tolerances of ±0.02mm on critical surfaces, while specialized fixturing during sintering prevents warping and maintains circularity. The precise geometry ensures proper fitment in assemblies and consistent magnetic performance across production batches.

Uniform Coating Application

Applying protective coatings to NdFeB ring magnets presents unique challenges due to the complex geometry with both internal and external surfaces. Our automated electroplating lines utilize specially designed fixturing and optimized bath agitation to ensure uniform Ni-Cu-Ni coating (12-15μm total thickness) on all surfaces, including the inner bore. For critical applications, we offer enhanced coating options including epoxy sealing of edges to prevent corrosion initiation points in the challenging inner diameter area.

Primary Applications for NdFeB Ring Magnets

Motor Systems

Brushless DC motors, servo motors, stepper motors, spindle motors, and generator rotors requiring compact, efficient magnetic circuits.

Sensors & Encoders

Rotary encoders, position sensors, speed sensors, and magnetic编码 systems requiring precise angular measurement.

Audio Equipment

Loudspeakers, microphones, headphones, and audio transducers utilizing ring magnet geometry for optimized magnetic fields.

Medical Devices

MRI components, surgical instruments, diagnostic equipment, and medical pumps requiring precision magnetic components.

Technical Specifications: Standard NdFeB Ring Magnet Series

The following table details our standard range of NdFeB ring magnets with common dimensions and specifications. Custom configurations including special dimensions, grades, magnetization patterns, and coatings are available for OEM applications with appropriate minimum order quantities.

Series Code	Dimensions (OD×ID×H) mm	Available Grades	Magnetization	Typical Gauss (Surface)	Pull Force*	Primary Applications
RR-10	10×5×3	N35, N38, N42	Axial	2,300-2,500 G	0.8 kg	Small sensors, micro motors
RR-20	20×10×5	N38, N42, N45	Axial/Radial	2,400-2,600 G	2.5 kg	Encoders, small DC motors
RR-30	30×15×8	N40, N42, N45H	Radial	2,500-2,700 G	6.5 kg	Servo motors, actuators
RR-50	50×25×10	N42H, N45SH, N48	Radial/Multipole	2,600-2,800 G	15.0 kg	BLDC motors, industrial drives
RR-80	80×40×15	N45SH, N48H, N50	Multipole	2,700-2,900 G	32.0 kg	Large motors, generators
Custom Rings	3-150mm OD range	N30-N55 all series	All patterns	2,200-3,000 G	Application specific	Specialized applications

*Pull force measured on steel plate with direct contact. Actual holding force varies with mating surface material, finish, and contact area.

Quality Assurance for Ring Magnet Applications

Every production batch of our NdFeB ring magnets undergoes comprehensive quality verification specific to annular geometries. We perform concentricity measurement using coordinate measuring machines (CMM) with rotary tables, magnetic field mapping with specialized probe fixtures for inner diameter surfaces, and coating thickness verification at multiple points on both inner and outer diameters. Our specialized test fixtures simulate actual mounting conditions to verify magnetic performance in representative applications. Complete test certificates include dimensional data, magnetic performance parameters, and coating verification for full traceability.

IATF 16949:2016 ISO 9001:2015 Concentricity Certified REACH & RoHS Compliant Full Field Mapping Motor Application Tested

Ring Magnet Mounting & Integration Guidelines

Proper installation of NdFeB ring magnets is critical for optimal performance and safety. We provide detailed technical guidelines including recommended interference fits (typically 0.02-0.05mm on diameter), adhesive bonding protocols for high-speed applications, and thermal expansion considerations for metal housings. For multipole magnetized rings, we supply orientation marking and precise angular alignment references to ensure proper phasing in motor and encoder applications. Our engineering team can provide application-specific mounting recommendations based on your operating conditions and performance requirements.

Request Ring Magnet Samples or Technical Consultation

Our engineering team specializes in ring magnet applications and provides comprehensive technical support including magnetic circuit analysis, thermal performance evaluation, and mounting design recommendations. We offer free sample NdFeB ring magnets for evaluation in your specific application, complete with test certificates and performance data. Contact us with your dimensional requirements, performance specifications, and application details for a comprehensive technical proposal and quotation.

Request Ring Magnet Consultation

Ring magnet specialist: +86-18226620303 (WhatsApp/WeChat) | Email: zb25@magnets-world.com | Technical response within 2 business hours for ring magnet inquiries

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