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Alternating current generator

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Alternating current generator

Alternating current generator

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Alternating current generator Alternating current generator Presentation Transcript

  • Alternating current generator By S, J and S
  • What is it?
    • A simple AC generator consist of:
      • A rectangular coil.
      • A magnetic field.
    • The coil spins in the magnetic field.
  •  
  • Induced EMF
    • When the coil is perpendicular to the B-field induced EMF is at a maximum.
    • When the coil is parallel to B-field induced EMF is 0
    • Because ε =BAN ω cos ω t
  •  
  • Power Station Alternators!
    • In a power station 3 sets of coils are used at 120 ° from each other.
    • Each produce an alternating emf 120 ° out of phase from one another.
    • The coils don’t spin the electromagnet (in the middle) does.
  •  
  • Back EMF
    • An EMF is induced in the spinning coil of an electric motor because the flux linkage through the coil changes.
    • The induced EMF is referred to as a back EMF because it’s opposed to the p.d.
    • Electric power supplied by the source (IV) = electrical power transferred to the mechanical power (I ε ) + electrical power wasted due to circuit resistance (I²R).
  • Fin