difference between dc series motor and universal motor
Universal motor
The universal motor is a type of electric motor that can operate on either AC or DC power and uses an electromagnet as its stator to create its magnetic field . It is a commutated series - wound motor where the stator 's field coils are connected in series with the rotor windings through a commutator . It is often referred to as an AC series motor . The universal motor is very similar to a DC series motor in construction , but is modified slightly to allow the motor to operate properly on AC power . This type of electric motor can operate well on AC because the current in both the field coils and the armature ( and the resultant magnetic fields ) will alternate ( reverse polarity ) synchronously with the supply . Hence the resulting mechanical force will occur in a consistent direction of rotation , independent of the direction of applied voltage , but determined by the commutator and polarity of the field coils . 
The universal motor is a type of electric motor that can operate on either AC or DC power and uses an electromagnet as its stator to create its magnetic field . It is a commutated series - wound motor where the stator 's field coils are connected in series with the rotor windings through a commutator . It is often referred to as an AC series motor . The universal motor is very similar to a DC series motor in construction , but is modified slightly to allow the motor to operate properly on AC power . This type of electric motor can operate well on AC because the current in both the field coils and the armature ( and the resultant magnetic fields ) will alternate ( reverse polarity ) synchronously with the supply . Hence the resulting mechanical force will occur in a consistent direction of rotation , independent of the direction of applied voltage , but determined by the commutator and polarity of the field coils .
The universal motor is a type of electric motor that can operate on either AC or DC power.  The universal motor is very similar to a DC series motor in construction, but is modified slightly to allow the motor to operate properly on AC power.
The universal motor is a type of electric motor that can operate on either AC or DC power and uses an electromagnet as its stator to create its magnetic field . The universal motor is very similar to a DC series motor in construction , but is modified slightly to allow the motor to operate properly on AC power .