Highlighting a rotating magnetic field

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In an asynchronous motor, it is the magnetic field that varies as a rotating field created in the stator. A...
In an asynchronous motor, it is the magnetic field that varies as a rotating field created in the stator. At startup, the rotating field sweeps the conductors of its flow at the angular speed of synchronism. The rotated rotor tends to catch up with the rotating field. In order for there to be a couple maintained at the level of the conductors, the flow variation must be present permanently; which means that if the drivers turn at synchronism speed as the rotating field, the flow variation on the conductors becomes zero and the motor torque disappears. An asynchronous motor rotor therefore never rotates at synchronous speed (50 Hz). For a motor with a pair of poles (at 50 Hz, the rotational speed of the rotating field is 3 000 [rpm]) the rotational speed of the rotor may be 2 950 [rpm] for example; here comes the notion of slip.
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