Which DC motor is preferred for constant speed?

Which DC motor is preferred for constant speed?

Right Answer is:

Shunt motor

SOLUTION

  • In the case of DC motors Speed ∝ Back emf(Eb)/flux(φ)
  • The field winding in the shunt motor is connected in parallel to the armature winding and the supply.
  • The field winding is connected across the armature. The resistance offered by the field is constant so the current is constant.
  • As current is constant flux is also constant because the flux is directly proportional to current.since flux is constant so the speed is also constant because speed depends on flux.
  • Hence the speed of the shunt motor can be assumed ALMOST constant under normal running conditions.
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