A permanent magnet synchronous motor is a synchronous motor that generates a synchronous rotating magnetic field by exciting permanent magnets.Permanent magnets are used as a rotor to generate a rotating magnetic field.The three-phase stator winding reacts through the armature under the action of the rotating magnetic field, and induces a three-phase symmetrical current.

　　At this time, the rotor kinetic energy is converted into electrical energy, and the permanent magnet synchronous motor is used as a generator.In addition, when the three-phase symmetrical current flows into the stator side, since the three-phase stators differ by 120 in the spatial position, a three-phase stator current is generated in the space.Withstand electromagnetic force in a rotating magnetic field.At this time, electrical energy is converted into kinetic energy, and a permanent magnet synchronous motor is used as the motor.

　　The permanent magnet synchronous motor can be integrally mounted on the axle to form an integral direct drive system, that is, one shaft is the drive unit and the gear box is omitted.

　　The characteristics of permanent magnet synchronous motors are as follows:

　　1PMSM itself has high power efficiency and high power factor;

　　2PMSM has almost no heat, so the motor cooling system has a simple structure, small size and low noise;

　　#3# The system adopts a fully enclosed structure, the gearbox has no wear, no noise, no lubricating oil, and no maintenance;

　　The allowable overload current of 4PMSM is very large, and the reliability has been significantly improved;

　　5 The entire gearbox is light in weight, and the unsuspended weight is also lighter than the traditional wheel and axle gearbox, and the unit weight is more powerful;

　　6 Because the permanent magnet synchronous motor does not have a gear box, the bogie system can be designed at will: for example, flexible bogies and single-axle bogies, which greatly improve the performance of power trains.