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Induction Motor Interview Questions with Answers | Part-1

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Types of DC Motor



  • There are three types of DC motor:
  1. Shunt wound
  2. Series wound
  3. Compound wound
  1. Shunt wound Motor

  • Circuit diagram of this type of motor shown in below image.

  • In this type of dc motor, Field winding is connected in parallel with armature.
  • When voltage across shunt field winding is same as supply voltage, it's resistance is very high. So shunt field winding has many turns of thin wire.
  • Here, shunt field winding is connected across the supply voltage, so Ish must be remains constant
  • Here, 
  • Ish = V / Rsh
  • IL = Ia + Ish
  • Eb = V - Ia Ra 
  •  Pi= V IL
  •  Pm = Eb Ia

   2. Series wound Motor 

  • Circuit diagram of this type of motor shown in below image.


  • In this type of motor field winding is connected in series with armature.
  • When field winding is connected in series with armature winding it carries full load armature current.
  •  It has few turns of thick wire , so it's resistance is very low.
  • Here,
  • Ia = Ise = IL
  • Eb = V - Ia ( Ra + Rse ) 
  •  Pi = V IL
  • Pm = Eb Ia 

  3. Compound wound Motor 

  • This type motor has a both types of field winding, such that shunt field and series field so it's called compound wound Motor.
  • According to winding connection it has two types.
  1. Long Shunt compound motor
  2. Short Shunt compound motor 
   1. Long Shunt compound Motor 
  • Circuit diagram of this type of motor is shown in below image.

  • In this type of dc motor shunt field is connected parallel with both series field winding and armature, so it's called long Shunt compound motor.
  • Here, series field winding is gives high torque at starting period at heavy load. And shunt field winding gives a constant speed at running time period.

   2. Short Shunt compound Motor

  • Circuit diagram of this type of motor is shown below image.

  • In this type of motor shunt field winding only connected in parallel with armature so it's called short Shunt compound motor.
  • It has also both winding series and shunt, so it's gives high starting torque and constant speed.
 



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