Three Phase Induction Motors

Thread Starter

JP93

Joined May 12, 2022
1
I am trying to understand how to calculate the stator current of a three phase star connected induction motor and it has been difficult to find any solutions from online resources. My understanding is I need to find the equivalent circuit impedance to work this out, how do I go about doing this? I have the resistance and induction values of the stator and rotors.

Thank you for your help.
Jack
 

MaxHeadRoom

Joined Jul 18, 2013
25,469
In a AC squirrel cage motor, the stator current is dependent on load and RPM?
The closer it gets to zero slip frequency, (which it can never reach exactly) the lower the current.
 

crutschow

Joined Mar 14, 2008
30,109
The motor current is primarily determined by the load connected to the shaft.
The rest is due to magnetizing current and friction losses.
 

MaxHeadRoom

Joined Jul 18, 2013
25,469
Also at the point of switch on, a squirrel cage AC motor represents a transformer with a shorted turn secondary due to the rotor 'cage'
 
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