After identifying the material best suited for your magnet or magnetic assembly, the next step is to determine the specific grade of material needed for your application.
For Neodymium, Samarium Cobalt, and Ceramic materials, the grade is an indicator of Strong Neodymium Magnets suppliers strength: the higher the material grade number, the stronger that magnet. Alnico is a notable exception to this rule. The size dependent nature of Alnico means grade will not always correlate with strength.
Choosing the proper material grade will have far-reaching implications for the performance of your product. Below are some factors to consider when selecting the material grade for your application:
1. Maximum Operating Temperature
Maximum operating temperature is a primary factor in determining which magnet material to choose; it is just as important when determining the grade of that material. Magnets are incredibly sensitive to fluctuations in temperature, so it is critical to have your operating temperature range defined prior to selecting your grade.
This is especially valuable for Neodymium, which has a diverse selection of operating ranges. You can view our available magnet materials grades for Neodymium, Samarium Cobalt, Ceramic, and Alnico. Not all material grades are available for every temperature range.
2. Required Magnetic Field Density or Holding Force
When determining the required magnetic field density or holding force, we offer a word of caution — don’t select a higher grade than what you may actually need. Why design with 52 MGOe Neodymium, when 45 MGOe Neodymium will suffice? While it may be tempting to choose the highest strength material grade, it may not work within your intended application. For example, N55 (55 MGOe Neodymium) offers high strength, but risks demagnetizing in high temperature applications. Choosing a higher grade than what you may need could also be unnecessarily expensive, particularly if you’re designing for a high-volume consumer application.
Neodymium Magnetic Pull Force Calculator
Samarium Cobalt Magnetic Pull Force Calculator
If you’re designing for a holding force application, these calculators will allow you to adjust your parameters to determine the grade, shape, diameter, and thickness you need.
3. Demagnetizing Resistance
A final consideration when choosing a magnet grade is the demagnetizing resistance. This factor will likely have a large impact on your final design. Your maximum operating temperature is directly correlated with the intrinsic coercive force (HCI) of the material. HCI is the resistance to demagnetization. The higher the HCI, the higher your operating temperature. While heat is the major contributor to demagnetizing, it is not the only factor. Magnetic fields produced in your system and the geometry of your part are other key factors for demagnetizing resistance. Once demagnetization occurs, the damage is often irreparable.
We offer a tool to help you calculate demagnetizing resistance against several variables:
Demagnetization/Permeance Coefficient (Pc) Calculator
Use this calculator to choose a potential design path based on your magnet grade, shape (Pc), and temperature.
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