Product Overview
High temperature permanent magnet segments engineered for electric motors, generators, automotive systems, and rotating machinery operating under elevated thermal loads.
Our high temperature arc magnets are manufactured in curved segment geometries for rotor and stator assemblies where magnetic flux density and demagnetization resistance must remain stable as operating temperatures rise.
Material selection is determined by your thermal limits, magnetic output targets, environmental exposure, and mechanical envelope. Suitable material options include high-temperature NdFeB, SmCo, and specialized ferrite grades.
Technical Specifications Overview
|
Parameter |
Specification Scope |
|
Magnet Type |
Arc Magnet / Segment Magnet / Tile Magnet |
|
Magnetic Materials |
High-Temperature NdFeB / SmCo / Ferrite |
|
Material Grade |
Selected by required temperature and magnetic output (Hcj, BHmax) |
|
Geometry & Shape |
Arc, segment, tile, with custom chamfers and features |
|
Magnetization Pattern |
Radial, parallel, diametrical, multi-pole, or custom configurations |
|
Arc Dimensions |
Inner Radius (ID), Outer Radius (OD), Arc Angle, Length, Width, Thickness |
|
Dimensional Tolerance |
Machined to customer drawing requirements |
|
Surface Treatment |
Ni-Cu-Ni, Epoxy, Zinc, Phosphated, or application-specific coating |
|
Operating Temperature |
Custom-matched to continuous and peak thermal loads |
|
Magnetic Testing |
Br, Hcb, Hcj, BHmax, and magnetic flux inspection |
|
Application Scope |
Motors, generators, actuators, pumps, and industrial drives |
|
Production Scale |
Prototype samples, pilot runs, and OEM mass production |
Material Options for High Temperature Applications
High Temperature NdFeB Arc Magnets
Selected when your motor design requires maximum magnetic energy density and high flux output in a compact space at elevated temperatures.
- Key Advantages: High BHmax, high flux density, space-saving compact motor designs.
- Grade Range: Standard and elevated-temperature grades, including H, SH, UH, and EH classifications.
- Engineering Note: Grade selection must be based on the actual internal magnet temperature, not just ambient air temperature, to prevent irreversible demagnetization.
SmCo (Samarium Cobalt) Arc Magnets
Selected when superior thermal stability, exceptional resistance to demagnetization, and corrosion resistance outweigh material cost.
- Key Advantages: Excellent temperature coefficients, highly stable magnetic output at extreme heat, minimal risk of thermal demagnetization.
- Typical Applications: High-performance aerospace motors, high-speed generators, industrial servo drives, and extreme-environment actuators.
High Temperature Ferrite Arc Magnets
Selected where moderate magnetic performance combined with excellent thermal stability, complete corrosion resistance, and low unit cost are primary design drivers.
- Key Advantages: Cost-effective for large-scale production, naturally high resistance to oxidation without heavy plating, stable performance in standard high-heat industrial utility motors.
Critical Magnetic Properties at Elevated Temperature
Room-temperature data alone is insufficient for high-temperature engineering. Evaluation focuses on:
Br (Residual Induction): Measures available magnetic flux density.
Hcj (Intrinsic Coercivity): The most critical metric for heat exposure; insufficient Hcj results in permanent magnetic loss under thermal and counter-magnetic fields.
Temperature Coefficients: Predicts performance degradation curves relative to heat increases.
Surface Treatment & Environmental Protection
Coatings must withstand both mechanical assembly friction and operating conditions.
Epoxy Coating: Superior edge coverage and enhanced corrosion barrier, widely used in sealed motor housings to prevent thermal delamination.
Ni-Cu-Ni Plating: Standard durable metallic plating for clean industrial environments.
Zinc / Phosphated: Alternative finishes for specialized low-cost or specific industrial applications.
Manufacturing & Quality Control Protocol
Production Route
Raw Material Batching -> Magnetic Field Alignment Pressing -> Vacuum Sintering -> Heat Treatment -> Precision ID/OD Grinding -> CNC Machining -> Surface Coating -> Magnetization -> 100% Magnetic & Dimensional Inspection
Inspection Checkpoints
Magnetic Performance: Verification of Br, Hcj, BHmax, and total magnetic flux.
Dimensional Accuracy: Laser and gauge verification of radius, arc angle, thickness, and length tolerances.
Surface Integrity: Coating thickness, adhesion, freedom from chipping, and absence of micro-cracks.
Typical Applications
BLDC motors, PMSM motors, high-speed servo motors, and traction drives.
Permanent magnet wind and industrial generators.
Auxiliary pumps, cooling fans, actuators, and drive-system components.
Heavy-duty compressors, industrial pumps, and precision automation drives.
Safe Packaging & Global Logistics for Fragile Magnets
Because sintered high-temperature arc magnets (especially NdFeB and SmCo) are structurally brittle and magnetically active, professional export packaging is mandatory to prevent transit damage:
Magnetic Shielding: Inner anti-magnetic iron-sheet or heavy cardboard shielding to neutralize external magnetic fields during air or sea freight.
Individual Cushioning: Foam-slotted or vacu-formed trays preventing segment-to-segment collision and chipping.
Reinforced Cartons & Export Pallets: Drop-tested master cartons secured on fumigation-free wooden pallets for international logistics safety.
Frequently Asked Questions
Q: What defines a high temperature arc magnet?
A: It is a curved segment permanent magnet engineered with specific coercivity and thermal stability to retain its magnetic performance under elevated operating temperatures without demagnetization.
Q: How do I select between NdFeB, SmCo, and Ferrite?
A: Selection depends on your required magnetic flux density and operating temperature ceiling. Use NdFeB for high energy density up to its temperature limit, SmCo for extreme heat and high resistance to demagnetization, and Ferrite for cost-effective, corrosion-free performance in moderate thermal environments.
Q: Is ambient temperature the same as magnet temperature?
A: No. Internal motor heating (from electrical windings, friction, and eddy currents) often makes the actual magnet temperature significantly higher than the ambient air temperature.
Q: Can you manufacture custom arc angles and radii?
A: Yes. All geometry, including inner radius, outer radius, arc angle, and segment length, is custom-machined strictly to your engineering drawings.
Q: Can you supply pre-production samples for testing?
A: Yes. Sample production and prototype runs can be arranged so your engineering team can validate dimensional fit, magnetic output, and thermal performance prior to mass manufacturing.
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