The speed of Universal Motor is

The speed of Universal Motor is

Right Answer is:

Greater in DC

SOLUTION

  • A universal motor is a series-wound or compensated series-wound motor designed such that it operates at approximately the same speed, giving the same output on either a DC supply or an AC supply of frequency 50-60 Hz and having nearly the same RMS voltage as the DC source.
  • When the motor is operated on DC, the current is limited by resistance only.
  • But in AC operation, the current is opposed by impedance which is built up of resistive and reactive components.
  • During AC operation of the universal motor, the inductive reactance of the armature and field windings opposes the current.
  • In effect, a reactance voltage is produced in both the armature and field windings, consuming some of the applied voltage.
  • Consequently, the speed of an AC series motor is less than that of the identical DC series motor.
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