Can someone help me with these questions?

Thread Starter


Joined Apr 17, 2022
Suppose that you have a 4-pole AC machine with three-phase stator windings and threephase rotor windings.
The stator terminals are connected to the 50 Hz grid and the rotor terminals are short circuited.
This setup can be seen as a rotating 3-phase transformer with secondary terminals short circuited.
Suppose also that at steady state, the rotor is rotating at 1400 rpm. What is the frequency of rotor currents?
What would be this frequency when the motor is rotating at 1500 rpm and will this machine be able to produce net torque in that case?
What type of a machine is this?
How the rotor current frequency changes if you even increase rotor speed to 1600 rpm?
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