The item and grade of NdFeB magnet are usually provided by the manufacturer or seller, which can be used to identify magnets of different specifications and performances. Item and grade are usually composed of letters and numbers, representing the material composition, magnetic properties and other information of the magnet. At the same time, NdFeB magnets of different specifications and performances will also have differences in the final price. Therefore, when we choose NdFeB magnets, we need to choose the item and grade that best suits our project.
- Tips: Different manufacturers may have slightly different data on item and grade
1.Item: It can be subdivided into N, M, H, SH, UH, EH, AH; the above letters represent different levels of magnetic temperature coefficient and maximum operating temperature, which is also the standard for us to judge the item of NdFeB magnet.
- N represents the standard level, which is suitable for general environment.
- M, H, SH, UH, EH, AH represent different temperature levels, which are suitable for high temperature environment.
2.Grade: From N35 to N52, this series of models represents the magnetic grade of NdFeB magnets, and the magnetism gradually increases. For example, N52 has the highest magnetism and the strongest suction.
- When making magnet projects, we need to choose the correct and appropriate Grade according to the actual situation of the project
3.35M, 38H, 42SH; this type of model usually combines the item and grade of NdFeB magnets, such as 35M represents N35 grade magnets and is suitable for medium temperature (100 degrees Fahrenheit) environment
Physical parameters of magnets:
- Br stands for remanence, which is not surface magnetism. Although both are based on Gauss, the higher the remanence of two magnets of the same size and shape, the larger the surface magnetism and the stronger the magnetism. However, the remanence may be the same for two magnets of different shapes, and the remanence is related to the raw materials. Surface magnetism is related to size, performance, shape, etc.
- Hcb stands for stubbornness, which refers to how much reverse magnetic field needs to be applied to reduce the magnetization intensity in a strong magnetic field to zero before returning to its original state. It is the ability of permanent magnet materials to resist external reverse magnetic field or other demagnetization effects.
- Hcj represents internal coercivity. The higher the internal coercivity, the better the temperature stability (anti-demagnetization). Internal coercivity refers to the inside of the magnet. Internal coercivity is the coercivity inside the magnet.
- (BH)max represents the maximum magnetic energy product. The larger the maximum magnetic energy product, the stronger the magnetism.
- According to the aspect ratio of the magnet, Tw represents the maximum operating temperature.
