induction motor

t_n_k

Joined Mar 6, 2009
5,455
At standstill the induction motor is essentially behaving as a transformer with a very low resistance secondary. With a wound rotor one can limit the starting current by connecting resistance in series with the rotor windings. The resistance would be switched out once operating steady state conditions are established. With the more common squirrel cage rotor one can limit the starting current on the stator side. DOL startup can produce very high starting current as you indicate.
 
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