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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...
Induced EMF
• When the coil is perpendicular to the B-
field induced EMF is at a maximum.
• When the coil is parallel to B...
Power Station Alternators!
• In a power station 3 sets of
coils are used at 120° from
each other.
• Each produce an
altern...
Back EMF
• An EMF is induced in the spinning coil of an
electric motor because the flux linkage
through the coil changes.
...
Fin
Fin
Alternating current generator
Alternating current generator
Alternating current generator
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Alternating current generator

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Alternating current generator

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Transcript of "Alternating current generator "

  1. 1. Alternating current generator By S, J and S
  2. 2. What is it? • A simple AC generator consist of: – A rectangular coil. – A magnetic field. • The coil spins in the magnetic field.
  3. 3. 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=BANωcosωt
  4. 4. 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.
  5. 5. 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 (Iε) + electrical power wasted due to circuit resistance (I²R).
  6. 6. Fin
  7. 7. Fin
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