Various types of Permanent magnets

Permanent magnets

We are a professional China magnet manufacturer and exporter. Permanent magnets are used in the following main areas: acoustic transducers, motors and generators, magneto mechanical devices, magnetic fields and imaging systems. You will find permanent magnets in many products such as televisions, phones, computers, audio systems, and cars.

Types of Permanent magnets

The permanent magnet family consists in general of rare earth permanent magnets and non-rare earth magnets. Rare earth magnets include Sm-Co (samarium-cobalt) magnets and Nd-Fe-B (neodymium-iron-boron) magnets. Non-rare earth magnets include alnico (aluminum-nickel-cobalt) and ceramic (strontium and barium ferrite) magnets.

Although most of these applications use non-rare earth magnets due to their economic cost, rare earth permanent magnets have many distinguishing characteristics such as a large maximum energy product (one efficiency indicator for permanent magnets). Recently, dozens of magnetic materials containing rare earth elements have been developed. The two main families of rare earth permanent magnets, Sm-Co magnets and Nd-Fe-B magnets, are widely used in various applications. Each family has its own merits and demerits.

Sintered neodymium magnet

Sintered neodymium magnet is one of the high presentation exceptional earth permanent magnets, which uses neodymium (Nd), iron (Fe) and boron (B) as the main ingredients, and is subject to demagnetization when exposed to elevated temperatures? Neodymium magnet is a new kind of magnetic material with excellent magnetic characteristics.

These magnets are extremely strong due to their small size, metallic appearance and simple shapes such as rings, blocks and discs. There are many brands that can withstand high temperatures, but several factors will determine the performance of a neodymium magnet.

Sintered SmCo magnet

Sintered SmCo magnet (SmCo magnets) is the biggest advantage, its high working temperature -350 ℃, usually a magnetizing field of about 30 to 45 kOe is required. SmCo magnet is widely used in motors, meters, converters, instruments, position detectors, generators, wind generators, radars and other applications.

Sintered ferrite magnet

Sintered ferrite magnet (ceramic magnets, hard ferrite magnet) was developed in the 1960s as an inexpensive alternative to metal magnets. Although they are low energy (compared to other permanent magnet materials) and relatively brittle and hard, sintered ferrite magnet (ceramic magnets, hard ferrite magnet) has gained wide recognition for its good demagnetization resistance, excellent corrosion resistance and low price per pound.  In fact, on a weight basis, ferrite accounts for over 75 percent of the world’s magnets consumption. Sintered ferrite magnet (hard ferrite magnet) is the best choice for most types of DC motors, magnetic separators, magnetic resonance imaging machines and automotive sensors.

Sintered NdFeB Magnet (Hard Ferrite Magnet) elements are iron oxide / barium, strontium. Ferrite has a higher coercive force and higher resistance to demagnetization and oxidation than other non-rare earth permanent magnets. The biggest advantage of these magnets is their low cost. It is widely used from motors and speakers to toys and crafts, industrial holding magnets, etc.

AlNICo Magnet

Using templates and simple molding techniques, AlNICo Magnet can be molded into a wide range of complex shapes and sizes at an economical cost. Eclipse Magnetics Alnico magnets are perfect for high warmth applications up to 550 ° C. The AlNICo magnet is very stable, has good corrosion resistance and a typical hardness of 50 ° C Rockwell. After casting, the material is so hard that the only possible processing is grinding. The china magnet AlNICo magnet is the most versatile magnetic material available.


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