Principle and application of rare earth permanent magnet motor

The working principle of the rare earth permanent magnet motor is the same as that of the synchronous motor. The difference is that the permanent magnet is replaced by the permanent magnet. When the three-phase stator winding (each phase difference of 120 degrees) of the permanent magnet motor is in the frequency of F, it will produce a rotating magnetic field with a synchronous speed. Under steady-state conditions, main magnetic pole with a rotating magnetic field synchronous rotation, so the rotor speed is also synchronous speed, the stator rotating magnetic field constant and permanent magnet establishment of the main pole magnetic field remained relatively static, their interaction and produce electromagnetic torque, driving motor rotation and energy conversion.

Compared with the traditional electro-magnetic motor, permanent magnet motor, especially rare earth permanent magnet motor has the remarkable advantages of simple structure, reliable operation, has the advantages of small volume, light weight, low loss, high efficiency; the shape and size of the motor can be flexible and other. So the application scope is very wide, almost all the fields of aviation, national defense, industrial and agricultural production and daily life. The main features of several typical permanent magnet motor and its main application are introduced in this paper.