Strong neodymium magnets (NdFeB) belong to the group of rare-earth magnets. At present, these are the strongest magnetic materials available. An almost linear behaviour of the hysteresis curve in the second quadrant provides an extremely high resistance to the effect of demagnetising magnetic fields that occur for example in rotating electrical machines.
Typically, our neodymium magnets are applied in electric motors and generators, magnetic couplers, magnetic separators, magnetic conveyors, magnetic clamps, and sensors. Manufacturing for the automotive industry is controlled pursuant to IATF 16949.
In the basic version, neodymium magnets show low corrosion resistance. Therefore, as standard they are protected by various types of metal and plastic coatings. Modification of the manufacturing process and addition of other chemical elements can result in a considerable increase of the corrosion resistance up to the level of a mass decrement of about 1 mg/cm2 during the corrosion resistance test HAST. The maximum rated temperature of this type of magnets achievable at present is in the range of 220 to 230°C, the temperature stability verified by a decrease in the magnetic moment at the rated temperature achieves the level of 3% at L/D=0.46. The Curie temperature is around 310–340°C, thermally these magnets can be demagnetised by heating to temperatures above 400°C. NdFeB-based magnetic materials we supply for heavy-duty electrical applications, such as electric motors and generators, exhibit the following outstanding properties.