Characteristics of Permanent Magnet Synchronous Motor

Permanent magnet synchronous motor (PMSM) has the advantages of simple structure, small size, light weight, low loss and high efficiency. Compared with DC motor, PMSM has no shortcomings such as commutator and brush of DC motor. Compared with asynchronous motor, with no reactive current, it has the advantages of high efficiency, high power factor, large moment inertia ratio, reduced stator current and stator resistance loss, measurable rotor parameters and controllable performance. However it also has the disadvantages of high cost and difficulty in starting. Compared with the common synchronous motor, it has no excitation device, simplifies the structure and improves the efficiency. The vector control system of permanent magnet synchronous motor can achieve high precision, high dynamic performance, wide range speed control or positioning control, so it has attracted wide attention of scholars at home and abroad！

China is a country rich in permanent magnetic materials, especially rare earth NdFeB resources. The reserves of the rare earth ore is about four times the total of other countries in the world, so China is known as "rare earth kingdom". The research level of rare earth permanent magnet materials and rare earth permanent magnet motors has reached the international advanced level. Therefore, permanent magnet synchronous motor has a good application prospect!