Arnold / Arnold Magnetic Technologies Permanent Magnets and Precision Magnetic Solutions

High-performance permanent magnets, RECOMA SmCo alloys, laminated magnetic arrays, and rotor sub-assemblies from Arnold / Arnold Magnetic Technologies: engineering selection for industrial machinery.

Sintered NdFeB Neodymium Permanent Magnets N35–N55

Sintered NdFeB neodymium magnets from Arnold / Arnold Magnetic Technologies deliver industry-leading maximum energy density. Produced in discs, rings, blocks, and arc segments, they power high-efficiency electric motors, magnetic couplings, actuators, and advanced sensors.

Energy product ratings spanning N35 through N55 for high flux motor drives
Thermal grades including M, H, SH, UH, EH, and AH operating up to 220 °C
Protective coatings including multi-layer nickel, epoxy barrier, and Parylene
Precision surface grinding holding mechanical tolerances within micrometers

GBD Grain Boundary Diffused Neodymium Magnets

Grain Boundary Diffused GBD Neo magnets from Arnold / Arnold Magnetic Technologies utilize heavy rare-earth diffusion to elevate coercivity. This metallurgy preserves remanent induction while mitigating thermal demagnetization risks in compact high-frequency rotating equipment.

Substantial boost in intrinsic coercivity Hcj with minimal remanence trade-off
Targeted diffusion of Dysprosium GBDD and Terbium GBDT along grain boundaries
Optimized configuration for thin magnetic pole segments under 6 mm thickness
Robust demagnetization resistance in high-frequency drivetrains up to 180 °C

RECOMA 33E and 35E Samarium Cobalt Permanent Magnets

RECOMA Samarium Cobalt magnets from Arnold / Arnold Magnetic Technologies are engineered for extreme operating environments. Grades 33E and 35E deliver extraordinary magnetic energy density combined with thermal stability, radiation hardness, and chemical endurance.

Continuous operating thresholds up to 350–550 °C without magnetic degradation
Remarkably low reversible temperature coefficients across broad thermal swings
Inherent corrosion resistance eliminating the requirement for external plating
Proven deployment in aerospace generators, turbines, and downhole tools

Precision Magnetic Assemblies and Rotor Sub-Systems

Arnold / Arnold Magnetic Technologies designs and manufactures complex magnetic sub-assemblies integrating permanent magnets with soft magnetic alloys. Turnkey solutions comprise high-speed motor rotors, sealed pump magnetic couplings, and precision transducer assemblies.

Complete integration of permanent magnets into shafts, hubs, and rotor sleeves
WrapTite carbon fiber containment sleeves engineered for ultra-high RPM rotors
Magnetic field stabilization and calibration conforming to project drawings
Manufacturing breadth spanning single-piece prototypes to volume production

L-Type Laminated Magnets for High-Efficiency Rotors

Specialized Arnold / Arnold Magnetic Technologies L-Type laminated magnets are developed to suppress eddy current losses in high-speed electric machinery. Thin electrically insulated magnet layers minimize rotor heat generation and maximize overall motor drive efficiency.

Multi-layer architecture featuring ultra-thin dielectric bonding layers
Suppression of parasitic eddy currents within high-speed rotor poles
Significant reduction in operating thermal rise and thermal demagnetization risks
Available in high-performance sintered NdFeB and RECOMA SmCo grades

Alnico Permanent Magnet Alloys and Pole Assemblies

Alnico permanent magnet alloys from Arnold / Arnold Magnetic Technologies provide exceptional temperature stability with a reversible temperature coefficient of 0.02% per degree. Inherently corrosion resistant, they serve precision sensors, meters, and electro-acoustic hardware.

Exceptionally low reversible temperature coefficient for precision meters
High remanence Br and balanced magnetic stability across wide thermal ranges
Inherent resistance to chemical oxidation in demanding industrial atmospheres
Specialized mechanical grinding and custom magnetic circuit assembly

Sintered NdFeB permanent magnet engineering across the Arnold line

Sintered Neodymium-Iron-Boron NdFeB permanent magnets from Arnold / Arnold Magnetic Technologies represent the highest magnetic energy density class in modern materials science.

Built upon advanced metallurgical intermetallic phases, these magnets achieve extraordinary residual flux density Br and maximum energy product ratings up to N55 for mission-critical industrial drives.

To withstand elevated thermal operating conditions, specialized grades including M, H, SH, UH, EH, and AH have been developed for temperatures up to 220 °C. The manufacturing processes utilize sub-micron tolerances.

For humid atmospheres, Arnold applies multi-layer nickel plating, protective epoxy barriers, or Parylene thin films to eliminate oxidation risks.

Advanced Grain Boundary Diffusion metallurgy in GBD Neo magnets

Grain Boundary Diffusion technology pioneered by Arnold / Arnold Magnetic Technologies elevates intrinsic coercivity Hcj while preserving maximum remanent induction. Conventional heavy rare-earth addition disperses elements uniformly across the grain volume, diminishing magnetic output.

The GBD method introduces Dysprosium GBDD and Terbium GBDT directly along grain boundaries.

Concentrating these heavy elements where demagnetization fields peak establishes high structural resistance against reverse domain nucleation.

This enables compact pole sections under 6 mm thickness to maintain continuous performance in high-frequency electric machines without suffering irreversible thermal demagnetization.

High-temperature RECOMA SmCo magnetic alloys for harsh environments

For severe industrial environments where operating temperatures exceed standard thresholds, Arnold / Arnold Magnetic Technologies manufactures RECOMA Samarium Cobalt magnets.

Proprietary alloys 33E and 35E offer temperature endurance up to 350-550 °C without metallurgical phase change, serving aerospace starter-generators and downhole tooling.

RECOMA SmCo materials exhibit low reversible temperature coefficients alongside high radiation hardness.

In contrast to iron-rich magnetic materials, Samarium Cobalt provides natural resistance to chemical oxidation, eliminating the requirement for external protective coatings when exposed to corrosive industrial solvents, fuels, or lubricants.

Turnkey magnetic assemblies and carbon fiber containment rotors

The engineering facilities of Arnold / Arnold Magnetic Technologies design and manufacture complete precision magnetic assemblies.

By combining high-performance permanent magnets with soft magnetic laminations, shafts, and specialized retaining sleeves, Arnold delivers optimized magnetic circuit flux for precision automation equipment.

For ultra-high-speed motor rotors, Arnold integrates proprietary WrapTite carbon fiber containment sleeves. These composite retaining bands withstand extreme centrifugal forces in excess of 100,000 RPM while preventing rotor deformation.

Each rotor assembly undergoes dynamic balancing and full three-dimensional magnetic field profiling prior to shipment.

L-Type laminated magnets for eddy current loss suppression

In high-speed electric drivetrains, high-frequency stator harmonics induce circulating eddy currents within monolithic permanent magnets, causing rotor heating and reducing machine efficiency.

Arnold / Arnold Magnetic Technologies resolved this mechanical challenge through L-Type laminated magnet assemblies composed of thin, electrically insulated magnet layers.

Subdividing the magnetic pole into thin segments with dielectric bonding layers disrupts eddy current pathways, reducing rotor thermal dissipation by up to 70%.

This lowers the operating temperature of the magnetic array, avoids thermal demagnetization, and boosts continuous torque density across demanding electric powertrain applications.

Alnico permanent magnet alloys for temperature-stable instrumentation

Alnico permanent magnets from Arnold / Arnold Magnetic Technologies deliver temperature stability with a reversible temperature coefficient of only 0.02% per degree.

This metallurgical property makes Alnico alloys the premier choice for precision sensors, flow meters, transducers, and measuring instruments requiring invariant magnetic fields.

Manufactured through sintered and molded metallurgical techniques, Alnico combines high remanence Br with natural resistance to chemical corrosion.

Arnold provides precision grinding for pole faces alongside custom magnetic circuit integration to achieve uniform field gradients across specialized industrial instrumentation.

Arnold / Arnold Magnetic Technologies and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Arnold / Arnold Magnetic Technologies and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.