Working principle of synchronous motor

Establishment of the main magnetic field

The excitation winding is passed with a DC excitation current to establish an excitation magnetic field between polarities, that is, the main magnetic field is established.

Current-carrying conductor

The three-phase symmetrical armature winding acts as a power winding and becomes the carrier of induced electric potential or induced current.

Cutting motion

The prime mover drives the rotor to rotate (input mechanical energy to the motor), the excitation magnetic field between the polar phases rotates with the shaft and sequentially cuts the stator phase windings (equivalent to the winding conductor reverse cutting the excitation magnetic field).

Generation of alternating electric potential

Due to the relative cutting motion between the armature winding and the main magnetic field, the armature winding will induce a three-phase symmetrical alternating electric potential whose size and direction change periodically. Through the lead wire, AC power can be provided.

Alternation and symmetry

Due to the alternating polarities of the rotating magnetic field, the polarity of the induced potential is alternated; due to the symmetry of the armature winding, the three-phase symmetry of the induced potential is guaranteed.