Back EMF & Rotor Flux: Synchronous Motor

[Passionate Eng]

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

 

[Baluncore]

Three phase field windings produce a rotary traveling magnetic field.
The wound rotor has a magnetic field.
The two fields lock to maintain synchronous rotation.

Which back EMF are you referring to ?

 

[jim hardy]

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/

*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/threa...et-alternator-under-load.754838/#post-4754007

 

[dlgoff]

I think these animations are awesome.

http://people.ece.umn.edu/users/riaz/animations/listanimations.html