Permanent magnet synchronous motor

The invention belongs to the field of motors, particularly relates to a permanent magnet synchronous motor, and aims to solve the problems that high temperature is difficult to dissipate in time due to high-load operation of an existing permanent magnet synchronous motor during use, a heat dissipation net port of the motor is easy to shield by foreign matters, and the service life of the motor is affected. A motor shell is fixedly connected to the top of the base, a heat dissipation shell is installed on one side of the motor shell, a stator is arranged on the inner wall of the motor shell, a stator winding is wound on the outer side of the stator, a rotating shaft is arranged on the motor shell, a rotor is arranged on the outer side of the rotating shaft in a sleeving mode, and a plurality of permanent magnets are arranged on the outer side of the rotor. When the motor is started, several auxiliary heat dissipation ventilation holes can be additionally formed intermittently, the heat dissipation efficiency i