Custom Arc Ceramic Magnets

Precision-engineered custom ferrite arc magnets designed for permanent magnet DC motors, BLDC motors, alternators, magnetic couplings, and industrial actuators. Manufactured from high-grade strontium or barium ferrite raw materials strictly according to customer CAD drawings and technical specifications, backed by strict ISO-certified quality control.

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Custom Arc Ceramic Magnets (Hard Ferrite)

Technical Specifications

Parameter	Specification
Material	Hard Ferrite (Strontium Ferrite: SrO·6Fe2O3 or Barium Ferrite)
Available Grades	Y25, Y30, Y30BH (Custom high-energy grades available upon request)
Remanence (Br)	2,300 – 4,200 Gauss (depending on grade)
Intrinsic Coercivity (Hcj)	2,400 – 3,500 Oe
Maximum Energy Product ((BH)max)	3.3 – 4.2 MGOe
Operating Temperature	-40°C to +250°C
Magnetization Direction	Through Thickness, Radial, or Multi-pole orientation
Standard Dimensional Tolerance	±0.1 mm (Precision diamond grinding available for tighter tolerances)
Surface Finish	As-sintered (Natural) or Precision Ground

Customization Parameters

We machine and press ferrite arc segments to match curved rotor and stator geometries precisely, eliminating secondary adjustments during motor assembly.

Geometry: Outer diameter (OD), inner diameter (ID), arc angle, axial length, and wall thickness.

Pole Configuration: Single-segment orientation or multi-pole blocks.

Export-Grade Packaging: Secure bulk packaging featuring individual physical separators and vacuum sealing to prevent chipping, friction damage, and magnetic flux interference during international freight transport.

Material Performance Characteristics

Superior Temperature Stability
Ceramic ferrite materials maintain linear demagnetization resistance up to +250°C. Unlike Neodymium-Iron-Boron (NdFeB) magnets, which suffer significant flux loss at elevated temperatures without heavy rare-earth additions (such as Dysprosium), ferrite maintains stable magnetic output under continuous motor operation and heavy frictional heat loads.

Excellent Oxidation Resistance
Because ferrite is a metallic oxide ceramic, the material does not require electroplated or epoxy coatings (such as Ni-Cu-Ni or zinc) to prevent oxidation. It is chemically stable in humid working environments, water pumps, and automotive auxiliary systems, ensuring a long operational lifespan.

Cost Efficiency for High-Volume Production
Derived from widely available iron and strontium/barium raw materials, hard ferrite bypasses rare-earth market volatility. It offers a predictable supply chain and significantly lower piece-part costs for annual volumes exceeding tens of thousands of units where extreme magnetic flux density is not required.

Manufacturing & Quality Process

Powder Compacting: Strontium or barium ferrite powder is wet or dry-pressed inside custom steel dies under a high-intensity magnetic field to align magnetic domains.

Sintering: Components are fired in a controlled tunnel kiln at 1200°C to 1300°C to achieve full densification and structural rigidity.

Machining & Grinding: High-precision diamond grinding wheels process arc inner/outer radii and end faces to exact blueprints.

Impulse Magnetization: High-energy electromagnetic coils saturate the material to the specified precise pole pattern.

Metrology & Inspection: 100% visual inspection combined with strict periodic sampling using Helmholtz coils (total magnetic flux measurement) and calibrated Gaussmeters.

Typical Industrial Applications

Permanent Magnet DC & BLDC Motors: Rotor and stator segments for automotive auxiliary motors, household appliance actuators, and cooling fans.

Generators & Alternators: Small-scale wind turbines and portable power generators.

Magnetic Couplings: Non-contact torque transmission in industrial pumps and fluid drives.

Acoustic Transducers: Speaker voice-coil magnetic circuits.

RFQ Requirements Checklist

To request a formal quotation or prototype tooling evaluation from our engineering team, please supply:

2D/3D CAD Drawing: (STEP, IGES, or PDF format with exact dimensions and critical tolerances).

Material Grade / Performance: (e.g., Y30BH or minimum Gauss/Flux values).

Magnetization Vector: (e.g., Radial, Axial, or Outer Diameter North).

Project Volume: Estimated annual volume / batch quantity.

FAQ

Q: What are custom arc ceramic magnets?

A: Custom arc ceramic magnets are curved permanent magnets made from hard ferrite materials. They are primarily engineered for applications where magnets need to fit circular structures seamlessly, such as motor rotors, stators, and generators.

Q: Are ceramic arc magnets stronger than neodymium magnets?

A: No. Neodymium (NdFeB) magnets generally provide significantly higher magnetic strength. However, ceramic magnets offer unmatched advantages including lower piece-part cost, superior corrosion resistance, excellent high-temperature stability, and a highly stable raw material supply chain. They are the ideal choice for high-volume applications where extreme magnetic strength is unnecessary.

Q: Can you manufacture magnets according to our specific drawings?

A: Yes. We specialize in custom manufacturing based on your CAD drawings, physical samples, exact dimensions, and technical requirements. We customize shapes, sizes, grades, and magnetization directions to fit your exact application.

Q: What information is required for a custom magnet quotation?

A: To ensure a fast and accurate response, please provide your magnet dimensions, material grade requirements, order quantity, magnetization direction, application details, and technical drawings if available.

Q: What is the typical production time for custom ceramic arc magnets?

A: Production time varies based on magnet size, tooling requirements, order quantity, and inspection specifications. For standard customized projects, production typically requires 3 to 4 weeks following technical drawing confirmation and tooling approval.

Q: Do ceramic magnets need protective coatings?

A: Normally, ceramic ferrite magnets do not require protective coatings because ferrite materials are naturally corrosion-resistant. However, special surface treatments can be evaluated and discussed for unique or highly demanding operating environments.

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