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
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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