Magnetic Flux Movement / Visualization in 3 Phase Induction Motor (Air Gap)

Thread Starter

Juan Andrew Sasongko

Joined Dec 4, 2017
18
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
 

MaxHeadRoom

Joined Jul 18, 2013
19,701
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.
 

crutschow

Joined Mar 14, 2008
24,084
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.
 

MaxHeadRoom

Joined Jul 18, 2013
19,701
@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.
 
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