Standard Samarium Cobalt (SmCo) arc magnets are engineered for high-temperature and thermally stable permanent magnet rotor assemblies. Built from rare-earth intermetallic compounds (SmCo5 or Sm2Co17), these segments deliver stable magnetic output up to 350°C with minimal thermal flux loss. Their curved geometry is ground to exact inner and outer radii for direct bonding or mechanical retention onto motor rotors, magnetic couplings, and generator poles.
Each lot is manufactured via powder metallurgy, magnetic field alignment pressing, vacuum sintering, and precision abrasive cutting to meet strict geometric interfaces required by high-density rotating machinery.
Technical Specifications
|
Property / Parameter |
SmCo5 Grades (e.g., YXG-16 to YXG-24) |
Sm2Co17 Grades (e.g., YXG-28 to YXG-33) |
|
Remanence (Br) |
820 – 950 mT (8.2 – 9.5 kGs) |
1050 – 1230 mT (10.5 – 12.3 kGs) |
|
Energy Product ((BH)max) |
128 – 184 kJ/m³ (16 – 23 MGOe) |
215 – 265 kJ/m³ (27 – 33 MGOe) |
|
Coercive Force (Hcb) |
>= 480 kA/m (6.0 kOe) |
>= 750 kA/m (9.5 kOe) |
|
Intrinsic Coercivity (Hcj) |
>= 1200 kA/m (15.0 kOe) |
>= 1500 kA/m (18.9 kOe) |
|
Max Operating Temperature |
250 °C |
350 °C |
|
Reversible Temp. Coefficient of Br |
-0.045% / °C |
-0.030% / °C |
|
Density |
8.3 g/cm³ |
8.4 g/cm³ |
|
Vickers Hardness |
~ 500 HV |
~ 550 HV |
Key Features
High Thermal Stability: Retains magnetic flux density up to 350°C, preventing thermal demagnetization in continuous-load motors.
Low Temperature Coefficient: Minimizes flux variation against ambient temperature shifts, ensuring predictable operational performance.
Intrinsic Oxidation Resistance: Features negligible iron content in Sm2Co17 variants, providing inherent resistance to environmental oxidation without mandatory electroplated coatings.
Anisotropic Alignment: Pressed under a 20-kOe magnetic field to lock crystal orientation along the designated flux axis, maximizing energy output per unit volume.
Mechanical Rigidity: High compressive strength combined with structural brittleness; withstands high centrifugal stress when retained in carbon fiber or metallic sleeves.
Applications
Aerospace Actuators: High-reliability brushless DC motors operating in extreme thermal and vibrational environments.
High-Speed Spindles: Rotor assemblies for high-RPM machining centers where centrifugal forces and heat dissipation demand stable rare-earth performance.
Defense & Avionics: Guidance control actuators, inertial navigation sensors, and thermal-imaging gimbal drives.
Industrial Magnetic Couplings: Hermetically sealed pump drives transmitting torque across containment shells at elevated process temperatures.
Motorsport Powertrains: Formula and EV auxiliary motor subassemblies requiring high power density and thermal endurance.
Customization
Manufacturing parameters adjust directly to finite element analysis (FEA) models and rotor assembly drawings:
Tailored coercivity (Hcj), energy product ((BH)max), non-standard radii, span angles, chord lengths, and axial thicknesses machined from block material.
Ground down to +/-0.02 mm for high-speed dynamic balancing.
Radial, parallel, or custom multi-pole field orientations aligned during pressing.
Uncoated standard finish, or passivated/nickel-plated configurations upon request to interface with structural adhesives.
Manufacturing & Quality Control
Production Process
Raw rare-earth elements are induction-melted under argon, strip-cast, jet-milled into fine particles (~ 3 um), aligned in a multi-axis pulsed magnetic press, vacuum-sintered above 1150 °C, and solution-treated/aged in multi-stage tempering furnaces.
Quality Control Protocol
• Chemical Composition: Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) verifies stoichiometric element ratios.
• Magnetic Performance: Hysteresis loops and demagnetization curves mapped using a Hysteresigraph up to 300 °C.
• Dimensional Inspection: Automated optical systems and contact coordinate measuring machines (CMM) verify radius, angle, and parallelism.
• Microstructural Integrity: Optical microscopy and dye-penetrant inspection screen for edge chipping, micro-cracks, and internal voids prior to shipment.
Packaging & Documentation
Packaging Standards
Individually separated in high-density closed-cell foam inserts to prevent edge chipping during transit.
Secondary magnetic shielding using low-carbon steel flux keeper plates to suppress external magnetic fields below international air/sea transport safety limits (IATA / IMDG regulations).
Vacuum-sealed anti-static moisture barrier bags with indicating silica gel desiccant.
Documentation Provided
Material Test Report (MTR) detailing batch-specific Br, Hcb, Hcj, and (BH)max values.
Certificate of Conformance (CoC) referencing raw material heat numbers and drawing revision levels.
Safety Data Sheet (SDS) and magnetic flux test verification charts.
FAQ
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