How is the magnetic field of a three-phase asynchronous motor generated?
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How is the magnetic field of a three-phase asynchronous motor generated?
Dalan Motor tells you that the three-phase asynchronous motor is a type of motor that is powered by a 380V three-phase AC power supply. Because the rotating magnetic field of the three-phase asynchronous motor rotates in the same direction and at different speeds, there is a slip. Rate, so called three-phase asynchronous motor.
When the three-phase stator winding of the motor is connected to the three-phase symmetrical alternating current, a rotating magnetic field is generated, which cuts the rotor winding, thereby generating an induced current in the rotor winding, and the current-carrying rotor conductor is generated under the rotating magnetic field of the stator. The electromagnetic force, thereby forming an electromagnetic torque on the motor shaft, drives the motor to rotate, and the motor rotates in the same direction as the rotating magnetic field.
When the conductor cuts the magnetic field lines in the magnetic field, an induced current is generated in the conductor, and the combined action of the induced current and the magnetic field applies a driving force to the rotor of the motor.
We let the closed coil ABCD rotate in the magnetic field B around the axis xy. If the magnetic field is rotated in a clockwise direction, the closed coil is subjected to a variable magnetic flux, generating an induced electromotive force that generates an induced current.
According to Lenz's law, the direction of the current is: the effect of the induced current always hinders the cause of the induced current.
Therefore, each conductor is subjected to a Lorentz force F opposite to the direction of motion of the induced magnetic field.
A simple way to determine the direction of the force F of each conductor is to use the right hand three hands to specify: the magnetic field acts on the current to place the thumb in the direction of the induced magnetic field, the index finger is the direction of the force, and the middle finger is placed in the direction of the induced current.
In this way, the closed coil is subjected to a certain torque to rotate in the same direction as the induced sub-magnetic field, which is called a rotating magnetic field. The electric torque generated by the rotation of the closed coil balances the load torque.
The three sets of windings differ from each other by 120 degrees, and each set of windings is powered by one of the three-phase AC power supplies.
The windings intersect with alternating currents having the same electrical phase shift, each generating an alternating sinusoidal magnetic field.
This magnetic field is always along the same axis, and when the current of the winding is at the peak, the magnetic field is also at the peak. The magnetic field generated by each set of windings is the result of two magnetic fields rotating in opposite directions, both of which are constant, equivalent to half of the peak magnetic field.
This magnetic field completes rotation during the power supply period, and its speed depends on the power supply frequency (f) and the number of magnetic pole pairs (P).
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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