Answer / oasis.enigneers@yahoo.com

The DC motor is biger then AC in size..

Answer / navaneetha

I think DC motor is bigger then AC in size..because as the
voltage is increased, the commutation, and sparking at
brushes increases.

Answer / kapil pandey

In AC- P = Root3 *V*I (for 3 phases) [ 3 core windings]
In DC - P= 3*V*I (for 3 phases)[6 core windings]
means for getting power sqroot3 times we have to wound
double. making the DC motor size bigger.
one more thing that the loss arresting system & protection
system shall also be bigger in case of DC.

Answer / nishant

i dink dc motor will be large ...bcz it require large conductors and large insulation bcz of a large dc .......

Answer / m tashfeen abbasi

The Dc motar bigger in size because the DC moter consist of Armature winding with commutater and inter pole winding, field winding and shunt winding

Answer / rabisankar

For 1phase AC machine P=v*i*cos (thita).
For 1phase DC machine P=v*i.
now cos(thita)<=1.
so for same power rating ac machine must have larger i than dc.
so thick conductor is required,so its size is larger than dc
machine.

Answer / mahesh

i think dc motor is smaller than ac its because in dc motor we can directly take the current from armature where as in case of ac motor it is taken from brushes and slip rings and extra components may include so the motor size is more for ac and it is less for dc

Answer / sunny

AC motor will be of bigger size because of the alternating nature of current to reduce eddy currents core is laminated & also the outer frame has given a shape for max. surface area to dissipate heat.

Answer / niks_4u86

i think it has to be AC as to reduce the reluctance for flux the air gap provided gets the size of AC motor greater than the size of dc motor insulation

what is the use of commutator in dc motor if we supply ac ? commutator is used to convert ac to dc.and it is used to arrange the flux in unidirectional in case of dc supply. if we give ac as supply to dc motor what is the use of commutator?

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