Due to the use of a permanent magnet to provide a magnetic field, the rotor process is mature, reliable, the size is flexible, and its design power range from dozens of watts to megawatts. At the same time, by increasing or decreasing the number of permanent magnets in the rotor, it is easier to change the number of poles of the motor, so that the speed range of the permanent magnet synchronous motor is comparatively wider.
With the use of a multi-poles permanent magnet rotor, the rated speed can be as low as a single digit, which is difficult to achieve by the ordinary asynchronous motor.
Especially in the application environment of low speed and high power, permanent magnet synchronous motor can adopt multi-poles direct drive at low speed. Compared with ordinary motor plus speed reducer, the advantages of permanent magnet synchronous motor are prominent.