Answer Posted / sivaraman

Depends upon your starting method. If your Squreel Cage
Inductoin motor statring Method is Star Delta Starting you
have to use Six Cores. If your Squreel Cage Inductoin motor
statring Method method is DOL (Direct Online) starting you
have to use three Cores and short the U2V1,W2U1,W1V2
terminals. If you are using Slip ring induction motors you
have to use external resistance for rotor windings for
starting purpose. in Slip ring motor terminals are K L M
and U V W , K L M is a rotor connection. U V W is a stator
connection.

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