Back EMF: Phase-to-Phase Voltage Explained

  • Thread starter Thread starter PhysicsTest
  • Start date Start date
  • Tags Tags
    Motor
AI Thread Summary
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.
PhysicsTest
Messages
246
Reaction score
26
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-)

1685378217666.png
 
Engineering news on Phys.org
It's this is concerning a field-oriented control .I hope this helps. Good luck to you.
 

Attachments

Hi all I have some confusion about piezoelectrical sensors combination. If i have three acoustic piezoelectrical sensors (with same receive sensitivity in dB ref V/1uPa) placed at specific distance, these sensors receive acoustic signal from a sound source placed at far field distance (Plane Wave) and from broadside. I receive output of these sensors through individual preamplifiers, add them through hardware like summer circuit adder or in software after digitization and in this way got an...
I have recently moved into a new (rather ancient) house and had a few trips of my Residual Current breaker. I dug out my old Socket tester which tell me the three pins are correct. But then the Red warning light tells me my socket(s) fail the loop test. I never had this before but my last house had an overhead supply with no Earth from the company. The tester said "get this checked" and the man said the (high but not ridiculous) earth resistance was acceptable. I stuck a new copper earth...
I am not an electrical engineering student, but a lowly apprentice electrician. I learn both on the job and also take classes for my apprenticeship. I recently wired my first transformer and I understand that the neutral and ground are bonded together in the transformer or in the service. What I don't understand is, if the neutral is a current carrying conductor, which is then bonded to the ground conductor, why does current only flow back to its source and not on the ground path...
Back
Top