It took me about a week to rewind this motor. Most time i spent on calculation of new winding. I had a lot of problems with calculation but i solved them and i got same parameters of winding as were on old one.
There is software that can be downloaded to help calculate the number of turns for a three phase motor. There are also diagrams which can be found for the most frequently used calculations.
I had a lot of problems with winding new winding too. First i made coils too small, and i couldn't insert last coils in slots. I couldn't access to them because other winding were too small. Then i decide to make bigger one but i found problem again. This time winding was too big and i couldn't close the cover of motor.
Third time i successful rewind motor. Because gap between stator and cover was very small, i decided to do a little bit bigger first coils, and a little bit smaller last coils. You can se that on measurment of resistance where, winding resistances aren't identical. But in next measurement we can see that resistances do not dramatically affect on electric motors performance.
I made all tests with two different voltages. Motor was made for voltage 380V, but now we have 400V in EU.
In upper table there is data from manufacturer in first line. In second line is measurement at 380V and third line at 400V. If we compare all data we can see that motor isn't bad at all. All parameters are very close together.
I took all electrical equations and orientation tables from book: Neven Srb ELEKTROMOTORI
I hope you enjoined my presentation of rewinding a three phase motor. If you have any questions please ask, and i will try to answer ass soon as possible. Thank you for your attention.
Best regards Niko
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