The working principle of synchronous motor and induction motor:

Synchronous motors, like induction motors, are a common AC motor. The characteristic is: when the steady state is running, the relationship between the rotational speed of the rotor and the grid frequency does not become n=ns=60f/p, and ns becomes the synchronous speed. If the frequency of the grid is constant, the speed of the synchronous motor at steady state is constant and independent of the magnitude of the load. Synchronous motors are classified into synchronous generators and synchronous motors. The AC machine in modern power plants is dominated by synchronous motors.

working principle

â—†The establishment of the main magnetic field: the excitation winding is connected with the DC excitation current to establish the excitation magnetic field between the polar phases, that is, the main magnetic field is established.

â—† Current-carrying conductor: The three-phase symmetrical armature winding acts as a power winding and becomes the carrier of the induced potential or induced current.

â—† Cutting motion: The prime mover drags the rotor to rotate (the mechanical energy is input to the motor). The excitation magnetic field between the polar phases rotates with the shaft and sequentially cuts the stator phase windings (corresponding to the conductors of the windings to cut the excitation magnetic field).

â—† Generation of alternating potential: Due to the relative cutting motion between the armature winding and the main magnetic field, a three-phase symmetric alternating potential whose magnitude and direction change periodically will be induced in the armature winding. AC power is available through the lead wires. (Select transformer electrical parameter tester)

â—† Cross-change and symmetry: Due to the polarity of the rotating magnetic field, the polarity of the induced potential is alternating; due to the symmetry of the armature winding, the three-phase symmetry of the induced potential is guaranteed.