FINAL UPDATE: 26.8.2024.
We're talking about a large 8/4-pole, two-speed motor with two independent form-wound windings, both connected in a Y configuration.
The number of slots is 72.
At first glance, the internal rewinding diagrams for such a winding seem very simple.
What could possibly go wrong?
The service center completed the repair using two diagrams for 4 and 8 poles, shown below.
Question for senior winders and/or motor designers:
will the motor with these two windings function correctly?
Get in touch if you'd like to join the discussion with your thoughts, questions, or suggestions.
Update: 22.8,2024
The repair will fail if the two windings are configured as shown.
The motor won't work, and the large form-wound winding will be wasted.
Please let us know if you can explain why this configuration won't work.
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Final Update: 26.8,2024
A unique opportunity to prevent one of the most dangerous (unfortunately very common) mistakes when repairing a two-speed, two-winding motor. A minor error can cost you several thousand USD and compromise your reputation. Learn about the problem in advance and gain an advantage over your competition. A comprehensive PDF publication that explains the cause and solution to the problem using a specific example is available at the link below under the title
"Key points to consider when repairing a two-speed electric motor with two sets of windings". Click on this title.
Prepare in advance. Don't wait for the problem to occur because then the solution is very expensive and time-consuming.
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