Permanent magnet synchronous motor principle introduction:

Permanent magnet synchronous motor is a synchronous motor that generates synchronous rotating magnetic field by excitation of permanent magnet. The permanent magnet acts as a rotor to generate rotating magnetic field. The three-phase stator winding induces three-phase symmetrical current through armature reaction under the action of rotating magnetic field.

At this time, the kinetic energy of the rotor is converted into electrical energy, the permanent magnet synchronous motor is used as a generator. In addition, when the stator side through the three-phase symmetrical current, because the three-phase stator in the spatial position of the difference of 120, so the three-phase stator current in the space to generate a rotating magnetic field, the rotor rotating magnetic field is moved by the electromagnetic force, at this time the electric energy is converted into kinetic energy, permanent magnet synchronous motor for motor.

The stator of the permanent magnet synchronous motor is the same as that of the asynchronous motor, the three-phase windings are spaced 120° apart evenly arranged.

1. The characteristic parameters of the stator include the number of winding phases (generally single-phase, three-phase polyphase) the number of winding slots.

2. The definition of the number of winding slots, half of the number of stator slots, divided by the product of the number of stator phases the number of rotor poles. According to the number of winding coils contained in each stator slot, permanent magnet motors can be divided into integer slot winding groups fractional slot winding groups.

(3) Fractional slot winding means that windings belonging to different phases may be placed in the same stator slot. Compared with integer slot winding group, fractional slot winding group, in addition to the insulation requirements are relatively high, the rest are advantages.

4, the number of slots need to be excavated on the stator core is reduced, saving space for winding use, simplifying the processing process; Each slot accommodates multiple poles, reducing the shock vibration generated by the excessive part between the slot the slot during the working process, improving the excitation waveform.