High-temperature Resistan N35SH Magnet for Rotor

Overview

The High Temperature Resistant N35SH Magnet is a premium-grade neodymium iron boron (NdFeB) magnet engineered for high-temperature environments, specifically designed to maintain magnetic stability in rotor applications where thermal resistance is critical. Classified under the SH temperature grade (max operating temperature: 150°C/302°F), this magnet features a nominal grade of N35SH, combining a remanence (Br) of 1.22-1.26 T with a coercive force (Hcj) ≥ 1750 Oe, ensuring reliable performance in motors, generators, and industrial rotors exposed to elevated temperatures. The magnet is available in custom shapes (arc, segment, or radial orientation) to fit precision rotor designs, with a nickel-copper-nickel (Ni-Cu-Ni) triple-layer coating that resists corrosion and mechanical wear.

Features

High-Temperature Stability:

SH Grade Performance: Maintains ≥90% of residual magnetism at 150°C for 1000+ hours, outperforming standard N35 magnets (max 80°C) in automotive engines, industrial gearboxes, and renewable energy generators.

Thermal Coefficient Control: Low temperature coefficient of remanence (αBr: -0.13%/°C) and coercive force (αHcj: -0.6%/°C), minimizing flux loss in thermal cycling applications.

Mechanical and Corrosive Resistance:

Triple-Layer Coating: 20μm Ni-Cu-Ni plating provides 500+ hours of salt spray resistance (ASTM B117), ideal for humid or corrosive environments like marine generators or outdoor wind turbines.

High Density (7.5 g/cm³): Offers superior mass-specific magnetic energy (BHmax: 33-35 MGOe), enabling compact rotor designs without compromising torque output.

Precision Manufacturing:

Custom Magnetization: Available in radial, axial, or multipole magnetization to match rotor slot configurations, reducing cogging torque and improving motor efficiency by 3-5%.

Tight Tolerances: Machined to dimensional accuracy of ±0.05mm (for arc segments) and ±0.1mm (for blocks), ensuring seamless integration into high-precision rotors.

Application

Electric Vehicle Motors: Used in traction motors for EVs, maintaining magnetic integrity in stator-rotor assemblies exposed to 120-150°C during high-speed operation.

Industrial Generators: Enhances power density in gas turbine generators, resisting thermal demagnetization in 150°C ambient temperatures typical of combined cycle power plants.

Renewable Energy Systems: Optimizes rotor performance in wind turbines (onshore and offshore), with corrosion resistance suitable for coastal environments.

High-Temp Sensors: Integrates into temperature-resistant sensors for industrial ovens and kilns, where magnetic signaling must remain stable at 150°C.

FAQ

Q: What is the difference between N35SH and standard N35 magnets?

A: N35SH uses a modified alloy with higher cobalt content, increasing the maximum operating temperature from 80°C (N35) to 150°C while maintaining similar magnetic strength.

Q: Can these magnets be used in MRI machines?

A: No, NdFeB magnets are not recommended for MRI due to eddy current losses. Use samarium-cobalt magnets for medical imaging applications.

Q: How should I handle these magnets to avoid thermal damage?

A: Avoid rapid temperature changes (>50°C/min) and ensure proper thermal conductivity between the magnet and rotor core to prevent hotspots.

Q: What is the minimum order quantity for custom rotor segments?

A: MOQ starts at 100 pieces for standard arcs; contact our team for lower quantities on prototype orders.