We have a simple understanding of the previous contentThree-phase asynchronous motorThe structure is mainly composed of two important parts: the stator of the stationary part and the rotor of the rotating part. After we know the respective roles and relationships of these two parts, we can understand the role of the rotating magnetic field:
The rotating magnetic field in the stator is a very important concept, if we pass alternating current on the coil, then we can see that the constant change of the power supply, the magnetic field will continue to change, the frequency of the change is related to the frequency of the power supply, but the change of the magnetic field is a vertical change.
Let's say we plug in three coils, and the angles are mutual120°, and then through the three-phase AC, three-phase power supply phase Angle is also120°The superposition of the magnetic field generated by such three coils is exactly a rotating magnetic field. At this time, many people may have a question mark, what is the role of the rotor rotating magnetic field? What happens to the rotor? What happens when the magnetic field revolves around the rotor?
Conductors generate current when cutting magnetic inductance lines (can be judged by the right hand rule); An energized conductor is subjected to an amperage force in a magnetic field, which causes the rotor to turn;Three-phase induction motorWhen the three-phase AC power supply is switched on, the internal induced current is generated before there is a reaction, and the amperage force will rotate. It can be simply understood that the three-phase power supply will make the stator winding have current through, resulting in a revolution ofn₀Under the action of the magnetic field, the rotor is subjected to the action of the electromagnetic force to the number of revolutionsnStart spinning, right herenIt never accelerates ton₀Because only in this way will there be a relative surface of motion between the rotor winding conductor and the rotating magnetic field to cut the magnetic field line, so that the induced electromotive force and current can be generated in the rotor conductor, resulting in electromagnetic torque, so that the rotor rotates continuously in the direction of the rotating magnetic field generated by the stator. That is to say, the speed of the rotor is always less than the speed of the rotating magnetic field, and the difference between the two is called the slip rate.
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