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    ndfeb magnets (strong magnet) with a small size, light weight and strong magnetic features, is by far the best price-performance magnets. expected in the next 20-30 years, there can be no alternative to a strong magnet ndfeb magnetic material appears. producing ndfeb magnets main raw materials are metal neodymium, iron and boron alloy, and other additives. 

    ndfeb magnet industrys core technology is mainly reflected in the manufacturing process, embodied in uniformity, consistency, quality and processing, coating and other aspects of quality of their products, manufacturers will have a general magnet production. 

    ndfeb magnets as the third generation of rare earth permanent magnet materials, with high performance and low cost, which are widely used in energy, transportation, machinery, medical, it, home appliance and other industries, especially with it knowledge represented economic development, to the ndfeb rare earth permanent magnet materials industry and other functions continue to bring new uses, which brings a more promising market for ndfeb industry. 
the main properties of the magnet 3 has the following performance parameters to determine the performance of the magnet: 

    (1) remanence br: permanent magnet magnetized to saturation technique, and after removing the external magnetic field, known as the retained residual magnetic flux density br. 

    (2) a coercive force hc: saturation magnetization of the permanent magnet to the technique b is reduced to zero, the need to increase the strength of the magnetic field is called reverse coercive force of the magnetic induction, referred to as the coercive force 

     (3) energy product bh: represents the magnetic energy density of the magnet in the air gap space (space of the magnet poles of two) are established, i.e., the static magnetic energy per unit volume of the air gap. since this energy is equal to the product of bm and hm magnet, so called energy product. 

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