Answer / sai kiran

in induction motor stator winding acts as primary winding and rotor winding acts as secondary winding. when we give supply to primary winding flux is produced by it . it is induced to secondary due to induced emf current is produced in secondary winding it possible only when secondary winding is closed loop hence we short rotor winding.due to this current flow in secondary winding .when current is produced then flux is produced in it .this is rotor flux it oppose main flux that is stator flux this opposing process is called armature reaction due to this rotor starts rotates reach less than synchronous speed.

generally in LT and MV motors we are using 3.5Coresx16,25,35,50 etc cable for supply.although motors is earthed at two point and having all protection.then why we are using that 1/2 core for earthing the motors.while in HT cable we are using only 3core cable for motor supply.generally lt and mv motors are delta connected and ht motors having star connection.whethere it is having any relation with winding connection( star or delta).all motors i am talking about are dol only.can anybody solve my confusion.thanks...

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