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Basic knowledge about Neodymium Magnets

Neodymium magnets (neodymium-iron-boron) are also known as NdFeB magnets or neo magnets. Neodymium (Nd) is a rare earth element and therefore NdFeB magnet belongs to rare earth magnet. Independently developed by Japanese (Masato Sagawa) and American, Neo magnets gained its market rapidly since 1983. Today, China is the largest producer of this rare earth magnet material.

Highest energy product

Neo magnets offer the highest energy product of any permanent material today and are available in a wide range of grades, sizes and shapes. The various grades of Tengye’s NdFeB material offer customers many options when selecting materials based on maximum operating temperature and energy product requirements.

The use of neo magnets in electric motors especially in servo drives is state of the art today. The excellent energy product has greatly increased the performance and reduce the size of modern electric motor. 

rotor magnet assembly

NdFeB magnet is by far the most powerful permanent magnets commercially available. (BH)max of N52 magnet is between 49 – 53 MGOe. The superior energy product means that a smaller volume can achieve more energy, which downsize the overall product design.

One disadvantage of NdFeB magnet is its relatively low working temperature. The max working temp. of N grade magnet is even below 80°C. Expensive heavy rare earth (HRE) is usually added to improve the high temperature resistance of neodymium magnets.

Neodymium magnet requires coating

Iron (Fe) is the major component of neo magnets and it rusts in the air. NdFeB magnet needs coating to protect itself from corrosion and oxidation. Common coating types are Nickel-Copper-Nickel (NiCuNi), Zinc and epoxy. Special coatings such as gold, chrome, Tin and Teflon (PTFE) are also used for NdFeB magnets. 

Tengye provides a variety of coating option for your specific application. Salt spray test (SST) is available in house to ensure the coating quality. 

nicked coated neodymium magnets disc shape
bonded neodymiun magnets

Difference: sintered and bonded NdFeB magnets

Bonded NdFeB magnet is made by combining NdFeB powder and epoxy resin in a press. Bonded magnets are more flexible in terms of geometry and magnetization. While sintered NdFeB magnets exhibit higher energy product and can only be magnetized in the preferred direction.

Tengye is a preferred supplier of neodymium magnets for a variety of industries and applications. We provide sintered neodymium magnets from N grade to EH grade magnet for a variety of applications. Our market includes SH & UH grade in servomotor industry, N52 and N55 grade in the separation industry, laminated magnets in the high performance motor industry etc.

About Tengye: Tengye supplies finest permanent magnet materials and assemblies to world industry. We work closely with our customer from designing stage to mass production.

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Jonah Jin

Jonah Jin
Managing Director

Every customer deserves to be treated professionally and responsively.