Standard Ceramic Arc Magnets

Designed for permanent magnet DC motors, brushless (BLDC) motors, generators, and magnetic couplings, our standard ceramic arc magnets are manufactured from strontium ferrite (SrO * 6Fe2O3) via dry or wet pressing and high-temperature sintering. Backed by state-of-the-art production lines and robust annual capacities, their curved geometry matches rotor and stator contours, optimizing magnetic circuit efficiency in rotating machinery.

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Standard Ceramic Arc Magnets | Technical Specifications & Wholesale Guide

Technical Specifications

Parameter	Specification Details
Material Composition	Anisotropic Strontium Ferrite (SrO * 6Fe2O3)
Shape & Geometry	Arc Segment (Custom inner/outer radius, arc angle, and length)
Available Grades	Y25, Y30, Y30BH, Y33, Y35, Y40
Remanence (Br)	3,300 – 4,300 Gauss (Depending on grade)
Coercivity (Hcb / Hcj)	Hcb >= 2.4 kOe
Max. Energy Product ((BH)max)	3.2 to 4.6 MGOe
Density	4.8 - 5.1 g/cm3
Surface Treatment	None required (Naturally oxide-stable; optional tumbling/deburring)
Max. Operating Temperature	Up to 250°C (Stable thermal performance with low temperature coefficients)
Quality & Compliance	ISO 9001 certified, IATF 16949 compliant manufacturing, RoHS & REACH compliant

Core Engineering Advantages

Stable Magnetic Circuit Efficiency
The curved arc profile minimizes air gaps between the magnet and the rotor or stator compared to flat or rectangular blocks. This geometry concentrates magnetic flux lines, improving torque output and operational stability in DC and BLDC motors.

Natural Corrosion Resistance (No Plating Required)
Because ferrite magnets are ceramic oxides, they do not require protective nickel, copper, or epoxy plating to prevent rust.

Cost Impact: Eliminates plating process costs and coating adhesion risks.

Application Fit: Ideal for humid environments, water pumps, outdoor ventilation fans, and automotive auxiliary motors.

Cost-Effective Scaling for High-Volume Production
Utilizing abundant raw materials (iron oxide and strontium carbonate), ferrite arc magnets offer a significantly lower and more stable unit cost than rare-earth neodymium (NdFeB) magnets. This makes them the economic choice for high-volume consumer appliances, power tools, and industrial automation actuators.

Controlled Thermal Stability
Unlike neodymium magnets that experience sharp performance drops at elevated temperatures, strontium ferrite maintains predictable magnetic outputs up to 250°C, ensuring consistent motor behavior under continuous industrial loads.

Typical Industrial Applications

DC & BLDC Motors: Automotive window lifts, wiper motors, cordless tool motors, and ceiling fan drives.

Pumps & Fluid Systems: Submersible pump rotors, magnetic drive centrifugal pumps, and circulation fans.

Power Generation: Small alternators, wind turbine auxiliary generators, and portable dynamos.

OEM Customization & Manufacturing Capabilities

We support direct-to-manufacturer and wholesale distribution orders tailored to specific assembly blueprints:

Dimensional Parameters: Custom inner radius (IR), outer radius (OR), thickness (T), width (W), and chord/arc length with strict mechanical tolerances (+/- 0.05 mm available upon request).

Magnetization Configuration: Thickness magnetization, parallel magnetization, or multi-pole arc orientation depending on rotor layout.

Supply Flexibility & MOQ: Scalable production runs designed for high-volume industrial supply chains, backed by reliable export packaging to prevent transit damage and guaranteed fast sample turnaround (7-day rapid prototyping).

Batch Quality Control: Every production run undergoes rigorous inspection for residual induction (Br), coercive force (Hcb/Hcj), dimensional profile, and visual integrity (surface chips and micro-cracks).

FAQ

Q: What is the difference between ceramic arc magnets and neodymium arc magnets?

A: Ceramic arc magnets use ferrite material, while neodymium magnets use rare earth materials.

Ceramic magnets offer lower cost, better corrosion resistance, and higher temperature stability.
Neodymium magnets provide much higher magnetic strength but at a higher cost. The right choice depends on motor design and performance requirements.

Q: Are ceramic arc magnets suitable for electric motors?

A: Yes. Ceramic arc magnets are widely used in permanent magnet motors, especially where cost efficiency, durability, and stable magnetic performance are important.

Q: Do ceramic arc magnets require coating?

A: Usually no. Ferrite magnets naturally resist corrosion because they are oxide-based materials. However, special coatings can be provided for specific applications if required.

Q: What magnetic grades are available?

A: Common grades include Y25, Y30, Y30BH, Y33, and Y35. Higher-performance grades (such as Y40) can be selected depending on motor requirements.

Q: Can you manufacture custom arc magnets?

A: Yes. We provide customized ceramic arc magnets according to size, radius, arc angle, magnetic direction, grade, and packaging requirements.

Q: What information should I provide for a quotation?

A: Please provide:

Magnet dimensions
Required quantity
Magnetic grade (if available)
Application
Magnetization direction
Annual purchasing volume

Our engineers can recommend the most suitable solution.

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