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

Thread 'Underwater piezoelectric sensor array receive sensitivity'

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...
View full post »

Thread 'What happens if shielded cable has short to the shield?'

While I was rolling out a shielded cable, a though came to my mind - what happens to the current flow in the cable if there came a short between the wire and the shield in both ends of the cable? For simplicity, lets assume a 1-wire copper wire wrapped in an aluminum shield. The wire and the shield has the same cross section area. There are insulating material between them, and in both ends there is a short between them. My first thought, the total resistance of the cable would be reduced...
View full post »

Thread 'Question about bonding ground and neutral'

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...
View full post »

Similar threads

Digital phase converters for running 3-phase motors
Replies
27
Views
302
Phase currents of Trapezoidal switching
Replies
4
Views
1K
Induction motor windings, number of turns per phase and per pole
Replies
2
Views
4K
Solve for phase-to-neutral voltage in terms of phase-to-phase voltage
Replies
14
Views
5K
Phase Current Sensing Circuit: Q&A
Replies
1
Views
1K
Measuring Phase to Phase voltage using Multimeter
2
Replies
54
Views
8K
Modelling the voltage measured across a dc motor
Replies
19
Views
2K
A little help understanding 3 phase waveforms and summation
Replies
5
Views
2K
Line and Phase voltages differences
Replies
1
Views
1K
Mexico Voltage: 460V/60Hz to 127V Explained
Replies
5
Views
10K

Hot Threads

Recent Insights

Back
Top