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Rotation principle of three - phase motor
2020/08/18
Rotation principle of three - phase motor

1. Electromagnetism: The three-phase symmetrical winding leads to the three-phase symmetrical current to generate a circular rotating magnetic field.


2, magnetic generation: rotating magnetic field cutting rotor conductor induction electromotive force and current.


3. Electromagnetic force: The rotor current-carrying body (active component current) is subjected to electromagnetic force under the action of magnetic field to form electromagnetic torque, which drives the motor to rotate and converts electric energy into mechanical energy.


As long as there is relative motion between the rotor windings and the air gap rotating flux density, the rotor will have current and will have electromagnetic torque acting on the rotor. When the electromagnetic torque is equal to the load torque, the rotor will operate at constant speed N.


In order to analyze the rotation direction of the rotating magnetomotive force, it is assumed that the three-phase symmetrical current changes according to the law of cosine, the maximum U phase current is the timing point, the current is positive when the first inlet and the last outlet are taken, the current waveform and the position of the rotating magnetomotive force at each time.


The rotating magnetic field is generated in the air gap by the symmetrical three-phase current in the stator winding.


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