Understadning Voltage Drop and the Current Theroy

MaxHeadRoom

Joined Jul 18, 2013
30,680
how is the slip frequency , voltage, current, torque , magnetic field inside the winding , faraday law related to each other.

Also the biggest of all who is drawing the current from the main supply the stator or the rotor
Re- my reference to the Induction motor representing a shorted transformer with a shorted turn secondary at turn on, the rotor bars (shorted turns) produce a high current in them and this is reflected back into the primary (rotor), just as it does in a transformer.
This current reduces as the slip frequency reduces (rpm increases) and the rotor attempts to rotate at the frequency of the stator field.
Nowadays the 'Bars' consist of aluminum single turn 'coils' embedded into the rotor, at one time these bars were copper and embedded into the steel rotor, the ends of which were joined with a copper plate soldered at the ends, on occasion on motor overheat, the rotor would fling the solder off, removing the effect of the shorted turn, this resulted in no motor revolution and zero torque, the motor stator becomes a high impedance choke.
Max.
 
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