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Induction Motor Interview Questions with Answers | Part-1

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DC Motor


  • DC motor is electrical machine which convert electrical energy into mechanical energy.

  • Principal
  • When current carrying conductor placed between electric field so it experience mechanical force.
  • The force direction is find by Fleming's left hand rule and it's magnitude is calculate by below formula.
F = B I L N
             where, B = flux density
                         L = conductor length
                         I  = current

  • Circuit Diagram 

  • Working
  • When we apply supply voltage armature of dc motor start rotating in magnetic field. so armature conductor cuts the magnetic field.
  • So, Due to principle of electromagnetic induction emf is induced in it. Induced emf direction is opposite of applied voltage, so it's called back emf. back emf value is always less than applied voltage.
Eb = (Ф Z N P )/ 60 A

  • Applied voltage has to force current through the armature conductors against this back emf. so electric work done in overcoming this opposition is convert into mechanical energy.
  • Energy conversion is not possible unless there is some opposition. 
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Comments

  1. UnknownJanuary 5, 2020 at 11:25 AM

    Hlo

    ReplyDelete
  2. Electrical engineeringOctober 22, 2020 at 9:05 PM

    great work brother
    https://electricalengineeringmachines.blogspot.com/2020/10/%20%20%20%20Working%20Principle%20And%20Types%20Of%20An%20Induction%20Motor.html

    ReplyDelete

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