Zero sequence winding component
Zero sequence winding component
(OP)
What is and how to calculate a zero sequence winding component for 3ph induction motor?
Where to find more on this topic?
Thanks in advance.
Where to find more on this topic?
Thanks in advance.





RE: Zero sequence winding component
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(2B)+(2B)' ?
RE: Zero sequence winding component
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RE: Zero sequence winding component
As is well known, each harmonic of unbalanced winding has two components in the same time (CW and CCW).
As far I know, sometimes they are called as "positive" and "negative sequence winding component". The terminology we use instead is "winding factor of CW and CCW component ".
For example: "fundamental negative sequence winding component" would be a winding factor of the CCW component for fundamental wave.
Please, see the first table on the link below (highlighted row). In this example is:
- fundamental positive sequence winding component = 0,9359
- fundamental negative sequence winding component = 0,0253
But the question remains what is understood as "zero sequence winding component".
http://winding.wix.com/design#!blank/c7lq
RE: Zero sequence winding component
http://www.youtube.com/watch?v=oYj7j5QBlY0
RE: Zero sequence winding component
Yes, I know to calculate the positive and negative sequence winding componenet but have an issue with zero sequence.
Calculating a zero sequence winding component is important for each unbalanced winding in order to determine whether the winding could be connected in delta, not just wye.
RE: Zero sequence winding component
You could assign each slot a voltage vector, expressed in complex notation as:
V = exp(i*n* (2*Pi)*pp/N)
where
n = stator slot number, sequentially numbered by physical position from 1 to N
N = number of stator slots
pp = number of pole pairs (pp=1 for 2-pole motor).
Then add up the voltage vectors for all slots of a given phase using a spreadsheet.
Repeat for each phase.
Now you have three vectors, one per phase.
Perform symmetrical components transform on the three vectors.
I can post example spreadsheet of what I have in mind if you're interested.
But I'll bet you already knew that much. Understanding and interpreting the the finer points of the results requires more knowledge than I have.
fwiw, I'd think 3rd harmonic zero-sequence components (present even in balanced winding) may play a large role in evaluating circulating currents in delta configuration also.
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(2B)+(2B)' ?
RE: Zero sequence winding component
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(2B)+(2B)' ?
RE: Zero sequence winding component
http://helios.acomp.usf.edu/~fehr/TE-2006-000213-draft.pdf