China Neodymium And Ferrite Magnets Manufacturer & Supplier 
Motor magnets are the core components that generate magnetic fields in motors. They are typically made of materials such as neodymium-iron-boron, ferrite, or samarium-cobalt. The grade and brand of various materials determine the magnetic energy product, magnetic flux output, and temperature resistance. This article lists eight issues related to motor magnet brands, hoping to be of help to you.
Q1. What exactly does the motor magnet grade represent?
The grade number serves as a classification label for the comprehensive magnetic properties of a magnet, primarily reflecting the maximum energy product (BHmax), remanence (Br), and intrinsic coercivity (Hcj).
Q2: Is N52 necessarily more suitable for motors than N35?
Not necessarily. "Adaptability" takes precedence over "high grade".
Q3: In motor design, should Br or Hcj be preferred?
For high-speed/high-temperature motors, Hcj (resistance to demagnetization) is preferred, while for low-speed/high-torque motors, Br (magnetic flux capability) is preferred.
Q4. What is the difference between the suffixes (H, SH, UH, EH) of magnet grades?
It indicates the temperature resistance level. For details, please refer to the performance parameter table chart of neodymium magnets.
Motor magnet ring - bonded neodymium magnet
Q5. Why are high-grade magnets more expensive?
The main reason lies in the higher proportion of rare earth elements (such as Nd, Dy, Tb), especially in the high Hcj version (UH/EH), where the cost increase is significant.
Q6. Which is more crucial, the grade or the size of the magnet used in motors?
All factors are crucial and need to be matched. The size determines the total magnetic flux. The grade determines the magnetic flux density.
Q7: Must the motor magnet be chosen from the highest temperature-resistant grade?
No. It is recommended to select the model based on the actual maximum operating temperature plus a margin of 20~30℃.
Q8. What are the most common pitfalls in selecting motor magnets?
Only look at the brand, not the temperature
Ignoring magnetic circuit design (air gap, core saturation)
Use surface Gaussian to judge performance
Ignore the impact of machining tolerances on magnetic flux
Long-term demagnetization (aging issue) is not considered
The above is an introduction to issues related to the grades of motor magnets. Our company specializes in supplying motor magnetic tiles and multi-pole magnetic rings. If you have any needs such as samples or quotations, please feel free to contact us.
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