Most of the magnets used by general motors, rubber and plastic magnetic prices are selected tile magnets, which are circular or ladder shaped, so the appearance of different motor motors is not the same. Such as rare earth permanent magnet motor or ac dc motor, linear motor, brush motor and so on. We generally apply hall induction magnetic ring price and rubber and plastic magnetic which good attraction and repulsion to promote, all normal conditions are the use of axial symmetry magnetization tile magnetic to form a ring. Sintered Ndfeb is a variety of raw materials, so it is more difficult to make complex magnetized orientation. At this stage, there are sintered Ndfeb magnetic radioactive magnetization magnet, but for the specifications and models of this kind are a lot of restrictions, and its magnetic energy is also very unstable, consistency is very poor, at the same time the mold shell electromagnetic coil and magnetization fixture such are very expensive. The electromagnetic field occurs after the electromagnetic coil is plugged into the motor, and the electric transmission coil is also called the electromagnet. The positive and negative sides of a magnet will attract the mutually repulsive opposite poles of an electromagnet. Therefore, it is necessary to have a magnet, otherwise the REDOX potential electromagnetic coil does not bear the force, the motor is not easy to rotate. Because the magnet is the key part of all mechanical equipment, so in the motor, most of the large and medium-sized motor will use ndfeb magnet, but also have some unique use of samarium cobalt magnet, in addition to some of the functional requirements of the motor is not too high, ferrite magnetic tile will be used. All normal electric motor rotor motor is full with nickel plating or magnets to form epoxy resin adhesive ndfeb magnet, average resistance at 120 ° C temperature fluctuation, and ferrite and samarium cobalt words can heat up and down 400 ° C, but relatively ndfeb magnet except hot enough, all to or better than samarium cobalt ferrite and more.