Samarium Cobalt arc magnets combine high thermal stability with strong magnetic energy output, engineered for use in permanent magnet rotating machinery. Composed of rare-earth SmCo (typically SmCo5 or Sm2Co17), these segments maintain magnetic performance at continuous operating temperatures up to 350°C, outperforming NdFeB alternatives in thermal environments where demagnetization risk is critical.
Supplied strictly to custom blueprints (ISO 9001 and IATF 16949 certified manufacturing framework), these arc segments serve as rotor or stator poles in brushless motors, aerospace actuators, and high-speed generators. Because SmCo material is extremely hard and brittle, production requires specialized diamond grinding, Wire EDM cutting, and precision orientation alignment during pressing to match exact flux distribution requirements and ASTM A977 testing parameters.
Technical Specifications
|
Parameter |
Specification Range |
|
Material Grades |
SmCo5 series (16-24 MGOe), Sm2Co17 series (24-32 MGOe) |
|
Max. Operating Temperature |
250°C to 350°C (482°F to 662°F) |
|
Residual Induction (Br) |
8,200 - 11,500 Gauss (0.82 - 1.15 Tesla) |
|
Coercivity (Hcj) |
6,000 - >12,000 Oe |
|
Density |
8.2 - 8.4 g/cm3 |
|
Standard Tolerances |
Mechanical: ±0.05 mm (Precision ground to ±0.025 mm available); Magnetic angle: ±0.5° |
|
Magnetization Directions |
Diametral, Radial, Arc Thickness (Parallel) |
|
Surface Finish |
Ground, unplated (inherently corrosion resistant) or Nickel/Epoxy coated upon request |
Key Features
Minimal magnetic flux output loss per degree temperature increase (αBr approx. -0.030% / °C for Sm2Co17), preventing thermal demagnetization in continuous high-load operations.
High cobalt content eliminates the strict requirement for protective nickel or copper-nickel-nickel plating in standard atmospheric environments, avoiding plating delamination risks at high RPMs.
Resistance to external demagnetizing fields generated by armature reaction currents in high-torque motor designs.
Magnetic domains locked parallel to the preferred axis during wet or dry pressing under high magnetic fields (>15 kOe), maximizing directional energy product (BHmax).
Applications
Aerospace Actuators: Control surface actuators operating under wide thermal swings and vibration compliant with aerospace component standards.
High-Speed BLDC Motors: Rotor assemblies for spindles and turbo-generators running above 50,000 RPM.
Magnetic Couplings: Hermetically sealed pump drives transmitting torque across containment barriers at elevated temperatures.
Defense Electronics: Guidance systems, radar drive motors, and stabilized gimbals requiring stable flux density over service lifespan.
Customization
Manufacturing parameters are configured directly from engineering drawings (STEP, IGES, or PDF). Production capabilities accommodate custom geometries and technical constraints:
Dimensions:
Outer Radius (OR), Inner Radius (IR), Arc Angle (θ), Axial Length (L), and Thickness (T).
Tolerance Classes:
Precision ground to ±0.025 mm using CNC multi-axis surface grinding equipment for high-balance rotor assemblies.
Magnetization Profiles:
Multi-pole segment configurations, skewed arc profiles, or specific pulse magnetization for complex air-gap flux shaping.
Assembly Preparation:
Matching sets sorted by hysteresis loop parameters (Br and Hcj within ±1%) tested via Pulsed Field Magnetometer (PFM) to prevent rotor imbalance in multi-segment assemblies.
Manufacturing & Quality Control
Production follows strict powder metallurgy processing routes under ISO 9001 and IATF 16949 quality management systems:
Raw Material Melting & Alloying: Vacuum induction melting of Samarium and Cobalt raw materials, followed by strip casting.
Jet Milling: Particle reduction to fine single-crystal powders under an inert nitrogen atmosphere to prevent oxidation.
Magnetic Alignment & Compacting: Isostatic pressing or die pressing inside a magnetic field (>15 kOe) to align crystal axes.
Sintering & Solution Treatment: Densification in vacuum furnaces followed by precise thermal quenching.
Machining: Diamond wheel contour grinding and wire EDM slicing (SmCo cannot be shaped via conventional metal cutting).
Inspection Protocol:
• Hysteresis Graph Testing: Measured via NIM/Hysteresis graph or Pulsed Field Magnetometer (PFM) at 20°C and max rated temperature in compliance with ASTM A977.
• Dimensional Verification: Optical comparator and CMM inspection for radius, angle, and parallelism.
• Visual Inspection: 100% check for chipping, edge flaking, and surface cracks characteristic of brittle intermetallic alloys.
Packaging & Documentation
Packaging: Individually separated in high-density closed-cell foam trays. Shielded heavy-duty corrugated cartons lined with steel keeper plates to contain magnetic flux and prevent physical impact during transit. Complies with IATA regulations for air freight magnetic cargo safety limits.
Documentation Provided:
• Material Test Report (MTR): Detailing chemical composition and physical density.
• Magnetic Performance Certificate: Br, Hcb, Hcj, BHmax per ASTM A977 standards.
• Certificate of Conformance (CoC): Referencing ISO/IATF quality parameters, PO, and drawing revision.
FAQ
Hot Tags: custom samarium cobalt arc magnets, China custom samarium cobalt arc magnets manufacturers, suppliers, factory, Arc Samarium Cobalt Magnet, FPC Magnetic Carriers, Halbach Array Magnets, Magnet for Auto Industry, Samarium Cobalt Disc Magnets, Square Samarium Cobalt Magnet
