Back EMF: Phase-to-Phase Voltage Explained

[PhysicsTest]

TL;DR Summary

Understanding of Back emf of PMSM motor

When the back emf of the motor is referred does it always refer to phase to phase voltage. For example
Back emf of A is A phase with respect to B phase? (A+, B-)
Back emf of B is B phase with respect to C phase? (B+, C-)
Back emf of C is C phase with respect to A phase? (C+, A-)

 

[Delta Prime]

It's this is concerning a field-oriented control .I hope this helps. Good luck to you.

 

[TonyStewart]

If you understand how transformers are reversible in both power transfer, voltage and impedance ratios, perhaps you can understand that most motors are reversible as generators with "BEMF" or RPM induced voltage.

For a deeper understanding ask a better question.

https://empoweringpumps.com/ac-induction-motors-versus-permanent-magnet-synchronous-motors-fuji/