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Custom Ring Ceramic Magnets

We manufacture high-performance custom ferrite ring magnets (custom ceramic ring magnets) for industrial motor manufacturers, sensor assembly suppliers, and OEM equipment builders worldwide. As a trusted OEM ceramic ring magnets supplier, we produce precision rings according to your technical drawings or specification sheets to match exact shaft diameters, mounting tolerances, and magnetic performance requirements.

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Custom Ceramic Ring Magnets & Ferrite Solutions

Technical Specifications

Parameter	Standard / Custom Specification
Material Composition	Strontium Ferrite (SrO * 6Fe2O3)
Available Grades	Y25, Y30, Y30BH, Y35
Dimensions	Outer Diameter, Inner Hole, and Thickness custom-machined per drawing
Dimensional Tolerance	Standard grinding tolerance +/-0.1 mm, precision ground down to +/-0.02 mm upon request
Magnetization Direction	Axial (flat faces) or Diametrical (inner/outer curve)
Maximum Operating Temperature	Up to 250 deg.C (grade-dependent)
Density	4.8 - 5.1 g/cm3
Hardness	6 - 7 Mohs (brittle; diamond tool processing required)
Surface Finish	As-sintered or precision diamond-ground; unplated due to intrinsic oxidation resistance

Ferrite Magnetic Performance Properties

Property	Typical Range
Residual Induction (Br)	2,000 - 4,200 Gauss
Coercive Force (Hc)	1,800 - 4,000 Oe
Intrinsic Coercive Force (Hci)	2,200 - 3,500 Oe
Maximum Energy Product ((BH)max)	1.0 - 4.5 MGOe

Key Material Advantages

Intrinsic Corrosion Resistance
Ferrite ring magnets are composed of ceramic iron oxides. Unlike rare-earth neodymium magnets, they do not require nickel, copper, or epoxy protective plating to prevent rust in standard industrial or humid environments. This eliminates coating degradation risks and lowers material expenses for large-volume assemblies.

High Thermal Stability
Ceramic rings maintain magnetic stability at elevated operational temperatures up to 250 deg.C. They do not experience the rapid thermal demagnetization typical of standard lower-grade neodymium alternatives during continuous motor or generator operation.

Precision Manufacturing & Quality Control

Our production process is structured to maintain consistency across pilot runs and large-volume bulk orders:

Compression Molding: Ferrite powder is pressed using matched tooling dies to achieve consistent initial green density and uniform shrinkage rates during firing.

High-Temperature Sintering: Parts are sintered in controlled kilns to form a stable crystal lattice, securing mechanical strength and temperature thresholds.

Diamond Machining: Due to a Mohs hardness of 6-7, outer diameters, inner bores, and flat faces are finished using diamond grinding wheels to meet tight mechanical assembly clearances.

International Compliance & Quality Assurance

Our manufacturing facilities operate under strict standardized protocols to meet global automotive and industrial supply chain requirements:

Certifications: Produced under ISO 9001 and IATF 16949 certified quality management systems.

Environmental Compliance: Fully compliant with RoHS and REACH regulations.

Comprehensive Inspection Protocol:
Dimensions: Verified using optical comparators and digital calipers to confirm outer diameter, inner hole concentricity, and thickness.

Magnetic Flux: Tested via Helmholtz coils or Gaussmeters to verify surface field strength and batch consistency.

Visual Check: Screened for structural chipping, micro-cracks, or edge breakage.

Typical Industrial Applications

Electric Motors & Generators: Used in DC motors, automotive auxiliary motors, and motor ferrite magnets applications where thermal stability and cost control are primary design drivers.

Sensors & Switches: Applied in rotational speed sensors, Hall effect switches, and proximity detection units requiring a steady magnetic reference field.

Magnetic Separators & Holding Assemblies: Utilized in industrial filtration drums, scrap sorting conveyors, and mechanical holding fixtures that operate in wet or abrasive environments.

Acoustic Transducers: Integrated into loudspeaker voice coil assemblies and audio drivers.

Ceramic vs. Neodymium Ring Magnets

Feature	Ceramic (Ferrite) Ring	Neodymium (NdFeB) Ring
Magnetic Force	Moderate	Very High
Unit Material Cost	Low	High
Corrosion Resistance	Excellent (No plating required)	Low (Requires Ni/Cu/Ni or Epoxy coating)
Max Operating Temp	Up to 250 deg.C	Typically 80 deg.C to 200 deg.C (Grade dependent)
Mechanical Strength	Brittle (Ceramic)	Brittle (Metal alloy)

Production & Delivery Capabilities

Prototype Lead Time & Prototyping Support: Fast-track sampling available within 7 - 12 business days for standard custom dimensions. Low minimum order quantities (MOQ) are available for initial prototype testing and R&D phases.

Mass Production Capacity: Flexible scalable output from pilot batches to millions of pieces annually, supported by stable raw material supply chains and efficient shipping schedules worldwide.

Information Required for Quotation

To request an accurate quotation or prototype evaluation, please supply the following parameters:

2D/3D Technical Drawing: Showing outer diameter, inner hole diameter, thickness, and allowable mechanical tolerances.

Material Grade: Specified grade (e.g., Y30BH) or required performance parameters.

Magnetization: Axial (through thickness) or Diametrical.

Quantity: Prototype quantity versus estimated annual volume.

Application Details: Operating temperature and surrounding environment.

FAQ

Q: What information should I provide for custom ring magnets?

A: Outer diameter
Inner diameter
Thickness
Magnetic grade requirement
Magnetization direction
Quantity requirement
Application details

Q: Are ceramic ring magnets strong enough for industrial use?

A: Yes. Ceramic ring magnets are widely used in industrial applications where stable magnetic performance and cost efficiency are important. They are commonly used in motors, speakers, sensors, and magnetic devices.

Q: What is the difference between axial and diametrical magnetization?

A: Axial magnetization means the magnetic poles are located on the flat surfaces of the ring.
Diametrical magnetization means the poles are located on opposite sides of the ring diameter.
The correct choice depends on the magnetic field direction required by your application.

Q: Can you manufacture non-standard sizes?

A: Yes. We manufacture custom sizes according to customer drawings and application requirements. Custom options include outer diameter, inner hole size, thickness, magnetic grade, and magnetization method.

Q: Do ceramic ring magnets require coating?

A: Normally, ceramic ferrite magnets do not require coating because they have natural corrosion resistance. However, special surface treatments can be discussed for specific applications.

Q: What is the minimum order quantity for custom ring magnets?

A: MOQ depends on magnet size, tooling requirements, material grade, and production quantity, with flexible support for initial R&D stages. Contact our sales team with your specifications for a customized quotation.

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