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Induction Motor Interview Questions with Answers | Part-1

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Characteristics Of DC Shunt Motor

Characteristics Of DC Shunt Motor


DC shunt motor
Characteristics Of DC Shunt Motor


  • Circuit diagram of DC Shunt Motor is shown in below image.

Dc shunt motor
Circuit Diagram of DC shunt motor


  • We know that torque is directly proportional to the flux per pole and armature current.

  • So, Ta proportional to Φ and Ish

  • According to circuit diagram
  • Ia = IL - Ish
  • Ish = V / Rsh 
  • V = Eb + Ia Ra  


There are three characteristic s of DC Shunt Motor, which is mentioned below.
  1. Torque - Armature current ( T / Ia ) characteristics
  2. Speed - Armature current ( N / Ia ) characteristics 
  3. Speed - Torque ( N / T ) characteristics 

 1. Torque - Armature current characteristics


  • We know that field current is remains constant because of supply voltage is constant in dc shunt motor.

  • Here , for dc shunt motor flux is also constant because supply voltage is kept constant

  • So,  Ta Î± Ia

  • So torque is directly proportional to the armature current and it's graph is shown in below graph.

DC Shunt Motor
Characteristics Of DC Shunt Motor



2. Speed - Armature current characteristics

  • The formula of back emf for dc motor is given by

Eb = (Φ Z N P)/ ( 60 A)
And Eb = V - Ia Ra


We know that, N Î± Eb / Î¦
So, N α ( V - Ia Ra ) / Φ


  • But, we know that flux Φ is constant in DC Shunt Motor.

  • So,.        N α V - Ia Ra

  • By this equation we tell that, if we increases the armature current Ia, so back emf will be decreases and so speed N is decreases slightly, which is shown in below graph.


DC Shunt Motor
Characteristics Of DC Shunt Motor


3. Speed - Torque characteristics


  • We know that the speed of dc motor is given by.       N Î±  Eb / Φ 

  • For dc motor flux Φ is constant

  • So, N  Î±  Eb  Î±  V - Ia Ra and also T  Î±  Ia

  • So here if armature current Ia increases, then the torque will be increases and Eb decreases so speed will be decreases. Which is shown in below graph.


DC SHUNT MOTOR
Characteristics Of DC Shunt Motor


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