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Induction Motor Interview Questions with Answers | Part-1

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D.C. GENERATOR


  • Definition
DC generator is device which converts mechanical energy to in form of electrical energy.
  • Principal
D.C. generator work on principal of electromagnetic induction. Whenever flux is cut by the conductor dynamically induced emf is produced in it.

  • Basic component of d.c. generator are as below
  1. Conductor 
  2. Magnetic field

  • For produce dynamically induced emf, three portions are needed
  1. Magnetic field  
  2. Conductors 
  3. Motion of conductor 

  • Magnetic field produce magnetic flux in the machine. The dynamically induced emf produced in the conductor will cause a flow of electric current in it, if the conductor circuit is closed.
  • Working

  • The emf induced in the armature conductors of a DC generator is alternating in nature. It is converts AC into DC in the external load circuit by the split-rings or commutator.

  • According to upper figure in first half rotation current flows through ABRCD. Here B1 brush is connected with segment S1 as the positive end of supply and B2 brush is connected with segment S2 as the negative end of supply.

  • In the next half rotation shown in upper figure the induced current direction being reverse. So segments S1 and S2 also being reverse but brushes are being constant in it place with supply.
  • So here direction of current in external load R is same or unidirectional.
  • Waveform of current




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