China Customized Samarium Cobalt Arc Magnets Manufacturers Suppliers Factory

Product Overview

Samarium Cobalt arc magnets are segmented permanent magnets designed specifically for motor rotors and stators. Unlike neodymium, SmCo retains remanence (Br) and intrinsic coercivity (Hci) at operating temperatures up to 350°C with a minimal thermal coefficient (approx. -0.03%/°C).
Production relies on powder metallurgy—vacuum induction melting, jet milling, magnetic alignment pressing, and high-temperature sintering—followed by diamond wheel grinding and wire EDM to form precise arc geometries.

Custom Samarium Cobalt Arc Magnets
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
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High Coercivity Samarium Cobalt Arc Magnets
High Coercivity Samarium Cobalt Arc Magnets are engineered from Sm2Co17 rare-earth alloys specifically for high-stress rotary equipment operating in extreme thermal and magnetic environments. Formulated to resist demagnetization where
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High Temperature Samarium Cobalt Arc Magnets
High Temperature SmCo Arc Magnets are engineered for synchronous motors, high-speed actuators, and sensor assemblies operating in extreme thermal and oxidative environments. Fabricated via powder metallurgy—combining jet milling, 2-Tesla
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Samarium Cobalt Arc Magnets For Generators
Sintered Samarium Cobalt (SmCo) arc segments provide permanent excitation fields for high-reliability generators and permanent magnet synchronous machines (PMSM). Engineered for continuous operation at temperatures up to 350°C and
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Samarium Cobalt Arc Magnets For Motors
Samarium Cobalt (SmCo) arc segments deliver high magnetic flux density and thermal stability for permanent magnet synchronous motors (PMSM) and high-speed BLDC rotors. Formed from Sm2Co17 and SmCo5 alloys, these magnets retain magnetic
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Standard Samarium Cobalt Arc Magnets
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
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Product Types

Grade	Remanence (Br)	Coercivity (Hci)	Max Operating Temp	Primary Application
YXG-28 (Sm2Co17)	10.5 - 11.3 kGs	>= 12 kOe	350°C	High-speed aerospace motors, industrial servos
YXG-26 (Sm2Co17)	10.0 - 10.8 kGs	>= 15 kOe	350°C	Defense actuators, gyroscopes
YX-24 (SmCo5)	9.0 - 9.8 kGs	>= 15 kOe	250°C	Standard industrial motors, magnetic couplings

Technical Specifications

Technical Parameter	Specification / Value Range
Alloy Composition	SmCo5 or Sm2Co17
Energy Product	16 to 32 MGOe (128 - 254 kJ/m³)
Density	8.2 - 8.4 g/cm³
Curie Temperature	750°C to 825°C
Electrical Resistivity	approx. 0.80 x 10^-4 ohm*cm
Outer Radius (Ro)	Up to 150 mm
Inner Radius (Ri)	Down to 5 mm
Arc Angle (theta)	5° to 180°
Axial Length (L)	Up to 100 mm
Standard Tolerances	+/- 0.05 mm on dimensions; +/- 1° on angular orientation (+/- 0.02 mm available via optical profile grinding)
Magnetic Orientation	Radial, Parallel, or Diametral per rotor CAD data

High Temperature Samarium Cobalt Arc Magnets

Demagnetization & Thermal Performance Curves

Because permanent magnet behavior changes under thermal and opposing magnetic loads, rotor designers require precise second-quadrant B-H loop data.

Thermal Demagnetization Thresholds: Curves illustrate intrinsic coercivity (Hci) degradation at incremental temperature steps up to 350°C.

Simulation Support: Complete demagnetization curve files compatible with motor design software (such as ANSYS Maxwell or Motor-CAD) are provided upon request during the engineering review stage.

Key Features

Thermal Stability:

Operates continuously at 300°C without risk of thermal demagnetization.

Corrosion Resistance:

Sm2Co17 variants contain no free iron matrix, preventing oxidation in ambient environments without mandatory coatings.

Linear Demagnetization:

Predictable magnetic output under heavy armature reaction fields due to a near-linear second-quadrant B-H curve.

Traceability:

Raw materials supplied with complete Material Test Reports (MTR) per production lot.

Applications

Aerospace & Defense:

Flight control actuators, missile guidance fins, radar drives, and auxiliary power units (APUs).

Electric Motors:

High-speed BLDC motors for electric propulsion and high-frequency alternators.

Industrial Automation:

Precision servo motors for high-ambient-temperature environments (e.g., vacuum furnace drives).

Scientific Instruments:

Magnetrons, linear accelerators, and magnetic bearings.

Customization

Geometry: Custom radii, asymmetric segments, step-ends, and keyway slots.

Magnetic Grading: Remanence (Br) and coercivity (Hci) sorting within +/- 1% per batch for multi-pole rotor balance.

Coatings: Uncoated (standard), Ni-Cu-Ni plating, epoxy coating, or Parylene film deposition.

Magnetization State: Delivered fully magnetized (flux-calibrated) or unmagnetized for post-assembly processing.

Manufacturing & Quality Control

Compliance: ISO 9001 and IATF 16949.

Melting & Alignment:

Vacuum induction melting, jet milling, and multi-axis alignment pressing.

Sintering & Aging:

Liquid-phase sintering in inert gas followed by precision aging heat treatments.

Machining:

Wire EDM and diamond-abrasive surface grinding under liquid coolant (material hardness approx. 500–600 HV).

Packaging & Documentation

Packaging: Individually separated using non-magnetic foam spacers in reinforced cartons. Outer packaging includes steel magnetic shielding to comply with IATA Class 9 regulations.

Documentation: Material Test Report (MTR), Dimensional Inspection Report, and Certificate of Conformity (CoC).

FAQ

Q: What is the maximum operating temperature for Sm2Co17 arc magnets?

A: Standard Sm2Co17 grades operate continuously up to 350°C. Exceeding this limit causes irreversible flux loss depending on the magnetic circuit's load line.

Q: Do SmCo arc magnets require plating?

A: Generally, no. Sm2Co17 alloys resist oxidation in normal conditions. Nickel or epoxy coatings are applied only for specialized chemical exposure or electrical insulation.

Q: How do you prevent chipping during assembly?

A: Precision wire EDM and edge-chamfering minimize micro-cracks in the brittle intermetallic material. Mechanical retention fixtures or high-strength structural epoxies are recommended for rotor bonding.

Q: What is the standard lead time?

A: Prototype tooling requires 3 to 4 weeks. Mass production averages 5 to 6 weeks.

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