Custom Sector Ceramic Magnets

Manufactured from strontium ferrite (SrO*6Fe2O3), custom sector ceramic magnets are permanent arc segments engineered specifically for curved magnetic circuits, rotating electrical machinery, and precision industrial assemblies. They serve as a cost-effective, highly reliable alternative to rare-earth magnets in applications where extreme magnetic flux is not required.

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Custom Sector Ceramic Magnets

Technical Specifications

Parameter	Specification Details
Material Composition	Hard Ferrite / Strontium Ferrite (SrO*6Fe2O3)
Available Grades	C1, C5, C8, C10 (Custom grades available upon request)
Density	4.8 - 5.1 g/cm3
Operating Temperature	-40°C to +250°C (grade-dependent)
Machining Tolerance	Precision grinding tolerances up to ±0.05 mm (customizable per technical drawing)
Magnetization Options	Through-thickness, radial, or multi-pole magnetization configurations
Surface Condition	As-sintered or precision-ground finish (naturally corrosion-resistant)
Compliance & Quality Standards	Manufactured under ISO 9001 and IATF 16949 certified quality management systems; fully RoHS and REACH compliant.

Performance Characteristics by Grade

Material Grade	Typical Maximum Energy Product (BHmax)
C1	1.0 - 1.5 MGOe
C5	3.2 - 3.8 MGOe
C8	3.5 - 4.0 MGOe
C10	3.8 - 4.5 MGOe

Core Advantages

Geometry Tailored to Curved Assemblies
Unlike rectangular blocks or standard discs, sector magnets match the exact curvature of cylindrical rotors and stators. Custom parameters include:

Outer and inner radii matching specific air gaps with tight tolerances (±0.05 mm).
Specific arc angles and segment thicknesses tailored to your motor design.
Custom angular spans to minimize leakage flux in motor poles.

Intrinsic Environmental Stability
Ferrite ceramic materials possess high electrical resistivity and natural corrosion resistance.
No protective plating required: Eliminates the risk of coating delamination or flaking commonly found in plated neodymium magnets.
Humid environments: Performs reliably in damp operational conditions without accelerated oxidation.

Thermal and Demagnetization Resistance
Ceramic ferrite maintains a stable magnetic output across fluctuating operational temperatures up to +250°C, featuring a high intrinsic coercive force (Hci) that resists demagnetization under heavy industrial load cycles.

Manufacturing & Quality Control Process

Raw Material Preparation: High-purity iron oxide and strontium carbonate powders are wet- or dry-milled to achieve a homogeneous chemical composition.

Compression Molding: Powders are pressed in specialized arc-segment tooling under controlled magnetic or isotropic fields to form dense green bodies.

Sintering: Components are densified in continuous kilns at precision temperatures ranging from 1,200°C to 1,300°C.

Precision Grinding & Inspection: Diamond wheel surface grinding ensures tight outer/inner radius tolerances (±0.05 mm) and exact thickness control. Batches are rigorously sampled via hysteresis graph testing for residual induction (Br), coercivity (Hcb / Hcj), and BHmax under strict ISO 9001 and IATF 16949 quality protocols.

Typical Industrial Applications

Electric Motors & Generators: Used in DC motors, permanent magnet synchronous motors, and starter alternators to form stable stator and rotor fields.

Automotive Subsystems: Applied in cabin blower fans, wiper motors, seat adjustment actuators, and fluid pumps (backed by IATF 16949 quality standards).

Fluid & Air Handling: Integrated into magnetic drive water pumps, HVAC circulation fans, and ventilation impellers.

Information Required for Quotation

To help our engineering team evaluate and quote your custom sector ceramic magnets efficiently, please provide:

Dimensional Drawing or CAD Model: Outer radius, inner radius, arc length or angle, thickness, axial length, and precise tolerance requirements.

Material Grade: Desired ferrite grade (e.g., C8, C10) or specific performance targets.

Magnetization Direction: Radial, through-thickness, or multi-pole configuration.

Volume Requirements: Annual quantity, target delivery schedules, and batch sizes.

FAQ

Q: What are sector ceramic magnets used for?

A: Sector ceramic magnets are primarily used in electric motors, generators, fans, pumps, magnetic rotors, and other applications requiring curved magnetic structures. Their sector shape allows them to fit circular assemblies much more effectively than standard rectangular magnets.

Q: Are ceramic sector magnets stronger than neodymium magnets?

A: No. Neodymium magnets provide higher magnetic strength, but ceramic ferrite magnets offer distinct operational advantages such as superior corrosion resistance, high thermal stability up to +250°C, a highly stable global supply chain, and significantly lower cost. For high-volume industrial applications, ferrite magnets provide the most economical and reliable solution.

Q: Can you manufacture custom sizes, shapes, and tight tolerances?

A: Yes. We manufacture sector magnets entirely according to customer drawings, samples, or technical specifications, including customized radii, thickness, arc angles, magnetization directions, and precision-ground tolerances up to ±0.05 mm.

Q: Do ceramic magnets require coating?

A: Generally, ferrite ceramic magnets do not require protective coatings because their material naturally resists corrosion. However, special surface treatments or cleaning processes can be discussed if your application has unique environmental requirements.

Q: What information should I provide for a quotation?

A: Please provide:

Magnet dimensions and tight tolerance requirements
Technical drawing or 3D CAD sample
Magnetic grade requirement
Magnetization direction
Quantity requirement
Application details

This ensures our engineering team can recommend and quote the most precise, cost-effective magnet solution.

Q: What is the typical production lead time?

A: Lead time depends on magnet size, specification complexity, tooling requirements, and order volume. For standard specifications, production can usually be arranged quickly. Customized sector magnets may require additional tooling setup and initial sample testing time.

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