Back EMF: Phase-to-Phase Voltage Explained

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Back EMF in motors is often discussed in terms of phase-to-phase voltage relationships, where the back EMF of each phase is defined relative to another phase. For instance, back EMF of phase A is measured with respect to phase B, while phase B's back EMF is measured against phase C, and so on. This concept is particularly relevant in field-oriented control systems. Understanding the reversible nature of transformers can provide insights into how most motors can also function as generators, generating back EMF or RPM-induced voltage. A deeper inquiry into these concepts can enhance comprehension of motor dynamics.
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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-)

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

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