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Question
There are 2 motors without name plate and terminal  but one
is DC motor and another is induction motor.How one can
identify which one is DC and which one is AC motor?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
there is a one way u have to check the rotor if the
commutator and brush assembly present in dc motor but not in
AC motor .

but in size dc motor size quit large compare then Ac motor
and also usually Ac motor has outer cooling fins and blower
which is fixed on shaft in case of dc motor forced air
cooled inside the motor in-order to dissipate the heat .
 
Is This Answer Correct ?    10 Yes 4 No
Pandi
 
Answer
# 2
Ac Motors Body construction is slotted where In Dc motors construction is plain.reasons are given below.
In ac motors armature is static therefor more current for cooling purpose fins are required,thats why on motor body slots are given.
In case of DC Motors Armature is rotating therefor heat produced due to armature current.there for cooling ventilation
is required.and field is static,and it takes very small amount of current so thre is no cooling requirement for that.
 
Is This Answer Correct ?    7 Yes 3 No
Jignesh Mistry
 
 
 
Answer
# 3
Incase DC motor if u interchange the terminal,motor can be rotate reverse direction vice-versa.
Incase inductions motor if u interchange the terminal, motor can't be reversed
 
Is This Answer Correct ?    1 Yes 4 No
Amol Dhanbhar
 
Answer
# 4
Commutator is present even in ac series motor 
Is This Answer Correct ?    0 Yes 6 No
Marippan
 
Answer
# 5
very simple . a DC motor has a commutator which is mounted on
shaft. but induction motor have no commutator . it is
identified by its its winding connections[terminal box]
 
Is This Answer Correct ?    0 Yes 6 No
Gunasekhar
 
Answer
# 6
dc motors are usually smaller in size compared to ac motors

www.professionaldoordealer.com/articles/2006/05/ac-vs-dc.aspx
 
Is This Answer Correct ?    2 Yes 14 No
Swum
 

 
 
 
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