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  1. elinBG

    Does the slip-ring induction motor has a bigger NO-LOAD CURRENT, than the squirrel cage?

    I mean starting current without load www.eldvigateli.com
  2. elinBG

    DC motor rotor failure

    Hello, The brushes were changed because of the manufacturer send this brushes saying that they are the correct ones. The machine is kind of extruder, where 4 motors work in parralel. I am not sure what exactly do you mean by PCM, but even if it is available we cannot use it, because the motor...
  3. elinBG

    DC motor rotor failure

    Thank you for your answers! dArsonval, If I understand correct your english you doubt that the brushes were replaced? If so the brushes were replaced before 1 month with original brushes sent from the manufacturer (firstly the motor was with EG283 then with EG571) "molten tin/slash solder...
  4. elinBG

    DC motor rotor failure

    Hello again! We did all the things you suggested in this post, even more - setting the neutral, the brush-holder height, the mica, ordered original brushes from the manufacturer, dynamic balancing and etc... The motor worked fine for a month or this is what was told to us Yesterday they called...
  5. elinBG

    Adjacent pole, skip pole and consequent pole

    Thank you! www.eldvigateli.com
  6. elinBG

    Adjacent pole, skip pole and consequent pole

    Hello, I am still trying to get some official information about the winding of the compressor mentioned in this thread: http://www.eng-tips.com/viewthread.cfm?qid=359153 When reading several books, I noticed three strange type of connection diagrams: Adjacent pole Skip pole Consequent pole...
  7. elinBG

    Which current is used for rating AC induction motor leads

    The old winders in our repair shop have a "rule" which is the Nominal current divided by 8 (In/8) and then they choose the next larger size of cable (in sq.mm)...I found that this works for delta motors, for wye-connected, multiply by sqrt(3) :)) www.eldvigateli.com
  8. elinBG

    Which current is used for rating AC induction motor leads

    Do you mean the 6 inside leads? From the winding to the terminal board of the motor? www.eldvigateli.com
  9. elinBG

    Part-winding connection

    Hello all thank you for your answers! The motor is exactly as you said 36 slot stator, 12 groups, 8 groups of 2 coils (SPAN 1-8, 1-10) and 4 groups of one coil(SPAN 1-8) I said that you "can count" 24 groups, because the coils are kind of "doubled". For example: From slot Number 2, are going...
  10. elinBG

    Part-winding connection

    Hello, I finnaly opened the winding. Actually you can count kind of 24 coil groups, instead of 12. They are placed as you see them in the picture, one above the other. All the connections are as in the picture but the coil ends are splited for the part-winding. www.eldvigateli.com
  11. elinBG

    Part-winding connection

    Hello, Thank you for your replies! The winding impregnation is very hard and it is very dificult to take the connection, that is why we are so slow This is the correct position of the coils: The strange thing is that from the same slot and coil goes out two "coil end" Other strange thing...
  12. elinBG

    Part-winding connection

    Today we started to open the connection of the motor. The strange thing which is different from the first picture which @MotorWinder showed (4 pole, Delta connected, Part winding, Adjacent Pole, 2 Circuit), is that there are connections with 3 leads. The other strange thing in this point (where...
  13. elinBG

    Part-winding connection

    Like this? www.eldvigateli.com
  14. elinBG

    Part-winding connection

    Thank you very much @Motorwinder! One more hint please: How to read "Coil end No"? 1 is the beginning of the first coil and 2 is the end of the first coil 3 is the beginning of the second coil and 4 is the end of the second coil 5 is the beginning of the third coil and 6 is the end of the...
  15. elinBG

    Part-winding connection

    It looks a lot like this (delta/double star) : http://www.nzdl.org/gsdlmod?e=d-00000-00---off-0gtz--00-0----0-10-0---0---0direct-10---4-------0-1l--11-en-50---20-help---00-0-1-00-0-0-11-1-0utfZz-8-00&a=d&cl=CL2.1&d=HASH01693eebdf3891bea95c4ae7.7.4.2 But the K2, closing the star is missing...
  16. elinBG

    Part-winding connection

    Sorry!!! checked again, this schema is given exactly in the "Pole-changeable windings" section of Neven Srb's book! So it is very possible that @rhatcher is right! Tomorrow the motor will be cutted-off and winding striped out, I will try to draw the winding diagram. And I will appreciate if...
  17. elinBG

    Part-winding connection

    It is not a double speed motor.This is for sure The first photo which I shared (http://i.imgur.com/tFQ8go8.jpg) is from completely different source - the book "Winding technique of electric motors" by Neven Srb. But unfortunately there is only this schema and nothing explained :( Except that...
  18. elinBG

    Part-winding connection

    Hello, This is the schematic that is on the temrinal cover. This is the nameplate: Thanks www.eldvigateli.com
  19. elinBG

    Part-winding connection

    Hello, How is called this connection I found it on an semi-hermetic compressor it is used for "part-winding start". How does it work? Any information on it will be great www.eldvigateli.com
  20. elinBG

    87Hz Delta Motor

    more on this thread... Today I was thinking... What will happen if I calculate and rewind a 50Hz motor which was designed for 400V/Delta to 100V/Delta. Does it mean that I can run it up to 400V/200Hz? I will have the same torque (V/HZ ratio) up to 200Hz ==> so I will increase the power 4...

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