Description

Technical Parameters

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 aggressive chemical environments, SmCo retains magnetic induction where NdFeB grades experience severe thermal decay.
Alloy selections include Sm2Co17 (2:17 series) for maximum energy product and elevated thermal endurance, and SmCo1:5 for linear demagnetization curves and minimal temperature coefficients. Each segment undergoes precision diamond surface grinding to match exact rotor diameters, ensuring uniform air-gap control and structural integrity under severe centrifugal loads.

Technical Specifications

Parameter	Sm2Co17 (Standard Grade)	Sm2Co17 (High Coercivity)	Measurement Standard / Condition
Remanence (Br)	10.5 – 11.5 kGs (1.05 – 1.15 T)	9.8 – 10.8 kGs (0.98 – 1.08 T)	at 20°C
Max. Energy Product ((BH)max)	26 – 32 MGOe (207 - 254 kJ/m3)	22 – 26 MGOe (175 - 207 kJ/m3)	at 20°C
Intrinsic Coercivity (Hci)	>= 25 kOe (199 kA/m)	>= 30 kOe (238 kA/m)	at 20°C
Max. Operating Temp.	300°C	350°C	Dependent on load line coefficient
Temp. Coefficient of Br (alpha)	-0.030% / °C	-0.030% / °C	20°C to 150°C
Density	8.4 g/cm3	8.4 g/cm3	Sintered density
Vickers Hardness	500 – 600 HV	500 – 600 HV	ASTM E92
Electrical Resistivity	0.8 x 10^-4 ohm·cm	0.8 x 10^-4 ohm·cm	at 20°C

Key Features

Thermal Stability:

Resists irreversible flux loss up to 350°C, maintaining magnetic performance during peak generator thermal overloads.

Intrinsic Corrosion Resistance:

Formulated without a vulnerable iron matrix, eliminating the need for heavy electroplated barriers in humid or marine operational environments.

Linear Demagnetization:

Preserves a linear B-H curve across wide temperature shifts, simplifying finite element analysis (FEA) and magnetic circuit modeling.

Demagnetization Resistance:

Advanced grain-boundary tailoring prevents flux degradation under opposing fields induced by sudden short-circuit faults.

Applications

Aerospace Alternators: Main power generation units operating in high-altitude, elevated-temperature turbine environments.

Direct-Drive Wind Generators: Offshore and onshore multi-pole permanent magnet direct-drive systems requiring multi-decade service life.

High-Speed Industrial Drives: Turbogenerators and servomotors operating above 20,000 RPM where high shear stress and thermal dissipation challenge standard magnets.

Downhole Mud Motors: Telemetry generators and drill-string tools functioning in subterranean environments exceeding 200°C.

Customization

Production builds directly from customer engineering data (STEP, IGES, PDF blueprints). Customization parameters include:

Magnetic Anisotropy:

Diametral, radial, or multi-pole arc orientation configured to specific rotor pole topologies.

Air-Gap Matching:

Radii ground to match exact rotor lamination stack diameters to minimize parasitic harmonic losses.

Protective Finishes:

Uncoated (passivated), nickel-plated (Ni-Cu-Ni), or parylene-coated configurations to prevent micro-chipping during high-speed assembly.

Delivery State:

Supplied unmagnetized to facilitate structural adhesive curing during rotor assembly, or fully saturated with calibrated flux output.

Manufacturing & Quality Control

Production Workflow: Vacuum Induction Melting (VIM) -> Strip Casting -> Jet Milling -> Magnetic Field Alignment & Pressing -> Vacuum Sintering -> Solution Treatment & Aging -> Diamond Wire Slicing & Grinding -> Flux Verification -> Packaging.

Quality Assurance Protocol
• Dimensional Inspection: 100% optical and CNC coordinate measuring machine (CMM) verification for radii, arc span, and parallelism.
• Hysteresis Analysis: Lot-level testing via Hystograph systems to verify Br, Hcb, Hci, and (BH)max.
• Magnetic Moment Matching: Helmholtz coil sorting to ensure total flux variance within +/- 1% across a single generator rotor set.
• Metallurgical Integrity: X-ray fluorescence (XRF) for raw material alloy verification and ultrasonic non-destructive testing for internal micro-voids.

Packaging & Documentation

Packaging Standards

• Magnetic shielding containers utilizing high-permeability steel shielding plates to contain stray flux fields.
• Anti-static blister trays keeping individual arc segments mechanically isolated to prevent edge impact damage.
• Certified compliant with IATA air transport and IMDG ocean freight regulations for magnetized cargo.

Documentation Package

• Material Test Report (MTR) detailing chemical element percentages.
• Batch-specific magnetic performance test logs.
• Certificate of Conformance (CoC) traceable to ISO 9001 and IATF 16949 quality management systems.
Safety Data Sheet (SDS) and REACH/RoHS compliance statements.

FAQ

Q: Why specify SmCo instead of NdFeB for high-power generators?

A: SmCo features a much higher Curie temperature (approx. 700°C to 800°C) and a near-zero thermal coefficient for remanence compared to NdFeB. Operating thresholds above 120°C to 150°C mandate SmCo to avoid permanent thermal demagnetization.

Q: Can SmCo arc magnets be delivered unmagnetized?

A: Yes. Sintered blanks are machined and orientation-checked before being shipped unmagnetized. This prevents metallic debris collection during rotor mechanical assembly and allows high-temperature structural adhesives to fully cure prior to final magnetizing fixtures.

Q: What is the typical lead time for custom generator arc geometries?

A: Standard manufacturing and diamond-tooling cycles require 3 to 5 weeks, depending on raw block inventory and grinding complexity. Rapid prototyping runs are available for design validation phases.

Q: How is the brittleness of SmCo managed during transit and assembly?

A: Multi-wire diamond slicing and edge-break chamfering eliminate stress concentrations that cause chipping. Individualized, custom-molded cavity packaging prevents inter-magnet impact during international shipping.

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Samarium Cobalt Arc Magnets For Generators