Hi guys.
Could you please help me, I'm looking for a reference where I can see how the magnetic flux lines moves in 3 phase induction motor (air gap).
When I placed my hall effect sensor at the air gap of induction motor, the sensor would shows inconsistent data (north pole, south pole) changing very fast. So I'd like to know how's the visualization of the magnetic pole inside the induction motor
Thanks

 

Not sure what you are looking for, but the flux frequency from the stator of an induction motor will be whatever the supply frequency is. Typically 50Hz/60Hz.
Max.

 

In a three-phase motor the magnetic field rotates with a speed equal to the line frequency divided by the 1/2 the number of motor poles.
Thus for a two-pole motor operated at 60Hz, the field rotates at 60 rotations per second or 3600 RPM.

 

@Juan Andrew Sasongko An induction motor is essentially a 1ph or 3ph transformer with a shorted turn secondary, the current decreases as the rotor induced frequency decreases relative to the RPM.
The slip frequency and current can never decrease to zero.
Max.

 

When I placed my hall effect sensor at the air gap of induction motor, the sensor would shows inconsistent data (north pole, south pole) changing very fast.

The flux in the gap always changes at the main's frequency.