What Is Back EMF In Synchronous Motor?

NOTE!! !!
Its terminal voltage.
Terminal voltage V is equal to sum of effective voltage Ef and the voltage drop across stator impedance.
Ef is the effective voltage in the stator coil and is exactly opposite to that of back emf as back emf opposes it's cause.
If any doubts arise please feel free to leave them in the comment section.
If you like the video , refer it to your friends who might be interested.
Synchronous Motor Basics Playlist: • Synchronous Motor Basics

[@pkrishnaveni7463]

After seeing this video my doubt was clear.. thank u for this video sir..

[@pratikphadte]

Gladd 💪

[@amgmg2521]

Very clear explanation. thank you

[@pratikphadte]

Glad 🙌

[@srivardhini28]

Nice explanation tq bro

[@pratikphadte]

Good luck!

[@Yalla_Balaji]

man u understood my problem, back emf a confusing topic,

[@pratikphadte]

Thank you!

[@xiaosun9111]

what about the inductance and resistance of the stator coil wenn feeding 3~ AC? what relationship is with the resulting voltage?

[@pratikphadte]

Yeah it has , the Ef voltage is part of an equation [ stator terminal volatge = voltage drop due to impedance + Ef ] if the inductive or resistive drop are more then the value of Ef will be less.
Ef is the effective voltage in the coil

[@xiaosun9111]

@@pratikphadte thanks

[@prasanthdarla9059]

In synchronous motor first the rotor gets rotated to synchronous speed and excitation is given for magnetic locking.if they are magnetically locked they both rotate at same speed then how the rotor flux cuts the stator and back emf gets induced?? Please clarify

[@pratikphadte]

For a 3phase sync motor, we have various starting methods. One of them is the damper winding starting method where we run the sync motor as an induction motor first and when the rotor speed reaches 80% of sync speed, the rotor is provided with excitation. Similarly there are other staring methods where we can bring the rotor speed almost to sync speed and then provide the excitation.
Now coming to your question, i like to think that the rotor flux is rotating with speed almost equal to sync speed & the stator windings are stationary at one place. Apart from that when we provide excitation to the rotor, the foreign flux will definitely interfere with stator voltage drop(back emf). Hence some emf should be produced in stator winding. There is magnetic locking in the fluxes but no mechanical locking between the stator winding and rotor winding.

[@TEJASCLASHROYALE]

We rotote synchronous motor rotor at synchronous speed

[@pratikphadte]

yep!

[@karanagrawal4580]

Hlo
Pratik

[@pratikphadte]

Oh hey Karan , I have been a bit busy but I'm definitely working on the video , sonn I'm planning on uploading it
Peace😸