Structure of permanent magnet synchronous motor

The permanent magnet synchronous motor is mainly composed of rotor, end cover, stator and other components. The stator structure of a permanent magnet synchronous motor is very similar to that of an ordinary induction motor. The biggest difference between the rotor structure and an asynchronous motor is that high-quality permanent magnet poles are placed on the rotor. Depending on the location of the permanent magnets on the rotor, Permanent magnet synchronous motors are usually divided into surface rotor structures and built-in rotor structures.
The way the permanent magnets are placed has a huge impact on motor performance. Surface rotor structure - the permanent magnets are located on the outer surface of the rotor core. This type of rotor has a simple structure, but the asynchronous torque generated is very small. It is only suitable for occasions with low starting requirements and is rarely used. Built-in rotor structure - the permanent magnet is located in the iron core between the squirrel cage guide bar and the rotating shaft, which has good starting performance. Most permanent magnet synchronous motors use this structure.