Grade Comparisons
Compare specific NdFeB grades on BHmax, temperature rating, coercivity, and cost.
N35 vs N42
N35 vs N42
N42 delivers 20% more energy product than N35 at roughly 15-20% higher cost. For most motor and sensor applications, N42 is the better value per unit of magnetic output.
N48 vs N52
N48 vs N52
N52 delivers 10–15% higher energy product than N48, but at meaningfully lower temperature rating. Here is when each is the right choice.
N42 vs N42SH
N42 vs N42SH
Same BHmax, very different thermal envelope. N42 is room-temperature; N42SH handles continuous 150°C — the working grade for EV and robotics motors.
N45SH vs N48SH
N45SH vs N48SH
Both rated to 150°C continuous, but N48SH delivers ~7% more BHmax. For humanoid robotics and premium EV motors, the choice hinges on whether 7% flux is worth 10–15% cost.
N42H vs N42SH
N42H vs N42SH
Both deliver 40-42 MGOe, but N42SH buys 30 C more thermal headroom at a 10-15% price premium. The choice comes down to your worst-case magnet temperature.
Material Comparisons
Compare magnet materials — NdFeB, SmCo, and NdFeB variants (sintered, bonded).
NdFeB vs SmCo
NdFeB (Neodymium) vs SmCo (Samarium-Cobalt)
The two commercial rare earth magnet materials. NdFeB wins on energy density below 180°C; SmCo wins on temperature stability above 200°C and intrinsic corrosion resistance.
Sintered NdFeB vs Bonded NdFeB
Sintered NdFeB vs Bonded NdFeB
Sintered NdFeB is the high-performance standard. Bonded NdFeB is a polymer-matrix variant with lower BHmax but enables near-net-shape manufacturing and complex geometries.
NdFeB vs Ferrite
NdFeB (Neodymium) vs Ferrite (Ceramic)
NdFeB delivers 6-10x the energy product of ferrite. Ferrite delivers higher operating temperature, intrinsic corrosion resistance, and one-tenth the cost per kilogram. Pick by the application, not the absolute strength.
GBD vs Bulk Alloyed NdFeB
Grain Boundary Diffusion (GBD) vs Bulk Alloyed NdFeB
Two routes to high-temperature NdFeB coercivity. GBD concentrates dysprosium or terbium at grain boundaries using 30–60% less heavy rare earth; bulk alloying mixes HRE throughout the microstructure.
Coating Comparisons
Compare NdFeB coating systems on corrosion resistance, durability, and cost.
NiCuNi vs Epoxy
NiCuNi Coating vs Epoxy Coating
Triple-layer metal plating vs polymer barrier. NiCuNi is the default; epoxy is the right answer for outdoor, marine, and adhesive-bonded rotor assemblies.
Epoxy vs Zinc
Epoxy Coating vs Zinc Coating
Epoxy delivers better corrosion resistance and electrical isolation at a slight cost premium; zinc is cheaper and thinner but offers less protection in humid or chemical environments.
Architecture Comparisons
Compare magnet architectures — radial multi-pole rings, arc segments, and alternatives.
Radial Multi-pole vs Arc Segment
Radial Multi-pole Ring vs Arc Segment Assembly
Single-piece sintered ring vs bonded segmented assembly. Radial multi-pole delivers sinusoidal flux and smooth torque; arc segments offer modular flexibility at lower tooling cost.
Interior PM vs Surface PM
Interior PM (IPM) Rotor vs Surface PM (SPM) Rotor
IPM buries magnets in the rotor lamination to combine PM and reluctance torque; SPM mounts magnets on the rotor surface for higher torque density at base speed. The choice dictates magnet grade, control strategy, and total system cost.
Sourcing Comparisons
Compare supply-chain strategies — factory-direct vs trading, geographic sourcing options.
Factory Direct vs Trading Company
Factory Direct Supplier vs Trading Company
Buying directly from the manufacturer vs routing through a trading intermediary. The right structure depends on volume, technical complexity, and documentation needs.
China vs Japan NdFeB Suppliers
Chinese NdFeB Supplier vs Japanese NdFeB Supplier
China dominates global NdFeB production by volume; Japanese suppliers retain a niche in premium grades. The gap has narrowed substantially since 2020.
Certification Comparisons
Compare quality management system standards relevant to magnet supplier qualification.
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