The nature and application of NdFeB magnets magnet

NdFeB magnets can be divided into two kinds of sintered NdFeB and bonded NdFeB . Injection molding is actually bonded , sintered is heated by high temperature vacuum forming ! NdFeB magnets - still excellent magnetic : Material grades have N35-N52; various shapes according to specific requirements of processing: , round , square , punching, magnetic tile , magnetic , convex , trapezoidal ; Despite these advantages , However, surface rust , so usually require some protective surface treatment: nickel, zinc , gold-plated, epoxy · NdFeB magnets applicable environmental temperature is below 200 degrees.

NdFeB is the third generation rare earth permanent magnet materials, known as the " King of the permanent magnet ," appeared in the 1980s , it is a high intensity magnetic and relatively low cost of the permanent magnet materials have been unprecedented reused in various fields. It is a tetragonal crystal structure is composed of two symmetrical fourteen neodymium iron atoms and the atoms of boron atoms a . It nature's most abundant and most spontaneous magnetic iron and iron can make a fixed combination of magnetic rare earth neodymium in the same direction. This combination not only like a strong magnetic NdFeB magnets can pick up to 1000 times its own weight of iron , and cheap .
Using rare earth permanent magnet electrical instrumentation and electronic components can be further reduced product size , performance greatly improved , adapted electronics light, thin , small demand trends , but also makes efficient permanent magnet transportation vehicles and parts and electronic products , small and lightweight as possible.
For example, instead of using NdFeB permanent magnet speaker conventional ferrite or alnico magnets , can make the speaker weight under the circumstances to reduce the spread of power does not become 2-3 times , but also greatly improve the sensitivity of the speaker .
The rare earth NdFeB material can be applied to significantly reduce the weight of the motor on the development of various motor , the motor can be reduced dimensions , they can obtain efficient energy-saving effect and improve the performance of the motor, power electronics combined with the new technology , mechatronics product can be achieved on the application and development of the motor permanent magnet plays a major role. Recent specialty television Shenyang University Institute developed 1,120 kilowatts permanent magnet motor is the current world 's largest rare earth NdFeB permanent magnet motor , its mechanical power up to 97.5% , than it can replace a large common power level 1-2 motors.
Now NdFeB rare earth materials are penetrating into all areas of the national economy, small stereos, cell phones , DVD players , large automobiles, electrical equipment, magnetic levitation trains , NdFeB permanent magnet materials are showing great prospect .