What Is N45H?
N45H delivers stronger flux than N42H at the same 120°C rating, making it the go-to grade for compact EV auxiliary motors and high-efficiency industrial servos. Its balance of BHmax and HcJ suits designs where packaging dictates grade and thermal derating must stay controlled.
N45H Technical Specifications
| Remanence (Br) | 13.2–13.7 kGs (1.32–1.37 T) |
| Coercive Force (HcB) | ≥12.5 kOe (≥995 kA/m) |
| Intrinsic Coercivity (HcJ) | ≥17 kOe (≥1353 kA/m) |
| Energy Product (BHmax) | 43–46 MGOe (342–366 kJ/m³) |
| Max Operating Temperature | 120°C |
| Temperature Coefficient (Br) | -0.12 %/°C |
| Temperature Coefficient (HcJ) | -0.55 %/°C |
| Density (typical) | 7.5 g/cm³ |
| Vickers Hardness (typical) | 550–650 HV |
Values per IEC 60404-5 / GB/T 13560. Actual production values fall within the range quoted; batch-specific BH-curve data is provided on every certificate of conformance.
Where N45H Is Used
N45H is specified across the following application categories. Each links to a full application brief with design requirements and recommended grade combinations.
EV Motors
High-performance NdFeB magnets for electric vehicle traction motors, auxiliary drives, and e-axle systems — with the temperature stability and flux density required for continuous high-torque service.
Industrial Automation
NdFeB magnets for stepper motors, servo drives, linear actuators, magnetic couplings, and factory automation equipment across European and North American manufacturing.
Robotics
Radial multi-pole rings, joint-motor magnets, and high-torque servo-motor assemblies for humanoid robots, collaborative robots, and industrial robotic systems.
Recommended Coatings for N45H
Coating choice is driven by operating environment and assembly method. For N45H, the typical options are:
- •NiCuNi
- •Epoxy over NiCuNi
See our NdFeB Coatings Guide for a full comparison with salt spray data and decision framework.
Design Considerations When Specifying N45H
- 01Sweet spot for compact European automotive BLDC designs — widely qualified across Tier 1 portfolios.
- 02GBD-processed N45H offers strong total cost of ownership vs. standard-production equivalents.
- 03For 140°C+ environments, step to N45SH or N45UH.
Related Grades
↑ Higher temperature rating
N45SH (150°C)
↓ Lower temperature, lower cost
N45 (80°C)
Same family · High Temperature (H)
N38H · 36–39 MGOe (287–310 kJ/m³)
Same family · High Temperature (H)
N42H · 40–43 MGOe (318–342 kJ/m³)
Same family · High Temperature (H)
N48H · 45–48 MGOe (358–382 kJ/m³)
Same family · High Temperature (H)
N50H · 47–50 MGOe (374–398 kJ/m³)
Frequently Asked Questions
What is N45H NdFeB magnet?
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N45H delivers stronger flux than N42H at the same 120°C rating, making it the go-to grade for compact EV auxiliary motors and high-efficiency industrial servos. Its balance of BHmax and HcJ suits designs where packaging dictates grade and thermal derating must stay controlled.
What is the maximum operating temperature of N45H?
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N45H sintered NdFeB is rated for continuous operation up to 120°C. This is the practical upper limit before thermal demagnetization begins to affect performance. For a safety margin, design for a working temperature at least 20–30°C below the maximum rating.
What is the BHmax of N45H?
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N45H delivers an energy product (BHmax) in the range of 43–46 MGOe (342–366 kJ/m³). This is the maximum magnetic energy density the grade can produce, measured according to standard IEC 60404-5 magnetic testing.
What applications use N45H magnets?
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N45H is typically specified for EV Motors, Industrial Automation, Robotics. The grade's combination of 43–46 MGOe (342–366 kJ/m³) energy product and 120°C maximum service temperature determines its fit for any given motor or actuator design.
Request a Quote for N45H Magnets
Factory-direct supply from Mainrich International. IATF 16949 certified, EU-office support from London, 97% on-time delivery. Share your dimensions, quantity, and target application — we will quote within two business days.