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Choose the correct grade of Permanent Magnet Materials

How to choose the correct grade of permanent magnet materials?
Generally, a grade indicates the Maximum Energy Product of a magnet. E.g. Grade 35 implies the (BH)max is about 35 MGOe. A higher grade of permanent magnet has a better performance. However, higher grade is usually much more expensive. Taking sintered NdFeB magnets as an example, the price of Grade 45 is twice and even more of that of Grade 33.
You need to consider other property parameters, such as Br and Hci, besides the Maximum Energy Product.
Once you have decided which permanent magnet material is best for your application, the next step is selecting a grade. ¡°Trial and Error¡± is one way to select the suitable grade for your application. You can purchase several magnets with different grades and try each grade until you find one right for your applications.

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