What are the advantages of permanent magnet motors?

Permanent magnet motor has simple structure, small size, light weight, low loss and high efficiency. Compared with DC motor, it does not have the disadvantages of DC motor such as commutator and brush. Compared with asynchronous motors, it has the advantages of high efficiency, high power factor, large ratio of rotating inertia, low stator current and stator resistance losses, measurable rotor parameters, good control performance, because it does not require reactive excitation current. However, compared with asynchronous motors, there are also disadvantages such as high cost and starting difficulties. Compared with ordinary synchronous motors, the excitation device is eliminated, the structure is simplified and the efficiency is improved. The vector control system of permanent magnet synchronous motor can realize high accuracy, high dynamic performance and wide range of speed regulation or positioning control. Therefore, vector control system of permanent magnet synchronous motor has attracted extensive attention from scholars at home and abroad. China is a big country of permanent magnet materials, especially NdFeB, a rare earth permanent magnet material. The reserves of rare earth ores are about four times as much as those of other countries in the world, so it is called the "Kingdom of Rare Earths". The research level of rare earth permanent magnet materials and rare earth permanent magnet motors has reached the international advanced level. Therefore, for China, the permanent magnet synchronous motor has a good application prospect.