Synchronous motor

  • #1

Main Question or Discussion Point

how is the back emf affected by the flux of the rotor?
I know the relation : Ea=k*phi*w
but i need a physical explanation
 

Answers and Replies

  • #2
Baluncore
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Three phase field windings produce a rotary travelling magnetic field.
The wound rotor has a magnetic field.
The two fields lock to maintain synchronous rotation.

Which back EMF are you referring to ?
 
  • #3
jim hardy
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I made these drawings* some years ago for another thread that i can no longer find.

but you might find these two really old ones helpful
https://www.physicsforums.com/threads/synchronous-generator.538388/
https://www.physicsforums.com/threads/synchronous-generator-again.571174/
ugenetic1_zps528def0e.gif


ugenetic2_zpsb383c1b1.gif


ugenetic3_zps0b47bca3.gif


*They're hotlinked from Photobucket, an image hosting site where i placed them before PF had its "Upload" button, so the hotlink isn't inconveniencing anybody(see https://www.physicsforums.com/threads/hyperphysics-images.868337/ )

Here are two more old threads that might help
https://www.physicsforums.com/threads/armature-reaction-drop.826513/#post-5191404

see especially the animation linked in post 2 of this thread :
https://www.physicsforums.com/threads/sychronous-pernament-magnet-alternator-under-load.754838/#post-4754007
 
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