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  • Users: zlatkodo
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  1. zlatkodo

    Inquiry about missing post

    I'm wondering where my post from yesterday about the design of unbalanced three-phase windings went. Is it a technical issue, or was the post removed for moderation reasons? If it's a technical problem, I'll be happy to repost it. However, if it was removed, it would be helpful to understand...
  2. zlatkodo

    "New" starting method of 3-phase motors

    Recently, many motors with 9 terminals have been appearing in workshops. These motors are designed for one voltage and one speed. For more information, please visit the following link: https://winding.wixsite.com/design/post/unusual-example-from-practice. This new motor design appears to use...
  3. zlatkodo

    Need opinion from VFD experts

    I know, here are experts for VFD and my question is directed primarily to them. It is about the motor Konecranes type MF06 fed through the Dynamove Vector 3. Motor winding should be as usual at first glance . It is a simple , single-layer, three-phase, 4 pole winding (24 slots), connected...
  4. zlatkodo

    Quadruple Rated 3ph Motors

    Is there any standards or conventions for external wiring of quadruple rated three phase motors with 9 leads? It is about one voltage multi mode winding connected in four ways ( delta, wye, combined delta-wye etc) in order to get four different values of torque. http://winding.wix.com/design
  5. zlatkodo

    Rotor voltage for wound motor

    How to choose the rotor-voltage for three-phase slip ring LV motor in the design process? Are there any standards or rules? Zlatkodo
  6. zlatkodo

    Motor leads sizing

    Is there any NEMA or IEC standard, recommendation or rule for sizing of LV motor terminal leads? Zlatkodo
  7. zlatkodo

    4-pole pws winding

    Does anyone have an example of internal connection diagram for 4 pole PWS (part winding start)three-phase motor with divided windings in (33% + 67%) and (60% + 40%) ratio? Zlatkodo
  8. zlatkodo

    Copper instead aluminum

    An increasing number of small motors wound with aluminum wire comes in repair shops. Aluminum wire is replaced with a copper wire of reduced cross sectional area so that a portion of the slot (usually upper) is free of wires ( see here). What do you think, whether it is good practice and how it...
  9. zlatkodo

    Winding terminology etc

    General definitions for "conventional" and "consequent" winding are known, but there are differences in interpretation. What exactly means the terms "conventional" and "consequent" winding? Can both be single-layer and double-layer? Can both be lap and concentric? And the most important...
  10. zlatkodo

    Single-layer 2-pole winding for 18 slots

    There are three-phase 2-pole motor with 18 slots with single-layer winding and span 1-8. Do any of rewinders had such a case and what is the internal connection diagram? Standard single-layer windings are made with step 1-10 in two variants: pic1 and pic2. Does the diagram in pic3 is good...
  11. zlatkodo

    Values of flux densities vs frequence in induction motors

    The values of flux densities ( in air gap, back-iron and teeth) for standard three-phase, squirrel cage, LV motors are important data in the winding data calculation in each rewindshop. Empirical data from existing designs are commonly used. It is well known that the used values of flux...
  12. zlatkodo

    Calculate the no-load current of three-phase LV motors

    It would be good to calculate the value of no-load currents before rewinding. If all the winding-details and dimensions of the iron core and air gap are known, how to calculate the value of the no-load current? Whether someone is involved with this? Zlatkodo
  13. zlatkodo

    Electric Motor Lifetime

    The term "motor lifetime" is used in many calculations. There are also tables that predict motor life. This is a typical one. Are there any standards, rules, recommendations or any obligations of the manufacturer's about what must be the motor life under nominal conditions? Zlatkodo
  14. zlatkodo

    Two-Speed Constant Torque Winding

    The ratio: low speed HP / hi speed HP is usually 1:2, for the majority of two-speed Dahlander motors with constant torque winding. However, there are many such motors where the ratio is 1: 1.5. Are the internal connection diagrams and wiring the same in both cases or they are different? Does...
  15. zlatkodo

    Motor with rectangular slots

    What is the most appropriate method for securing the winding in the slots with a rectangular shape? Zlatkodo
  16. zlatkodo

    Inverter-Duty Motor Repair

    Every day more and more motors operate through a VFD. It would be good to see what the practice of rewinding such motors. In addition to using special wires, which are important differences in rewind "ordinary" and "inverter-duty" motors? Zlatkodo
  17. zlatkodo

    Motor-test without rotor

    Some rewinders make the test of three-phase motors without rotor with reduced voltage on the stator. I would like to know a little bit more about this test: what is the purpose of this test, what voltage is applied, how to interpret the results of measurements etc (here I am not talking about...
  18. zlatkodo

    Triple and Quadruple rated , 9 Leads Motors

    Where can I find out more (descriptions, wiring diagram etc) about the triple and quadruple rated , 9 leads motors? Zlatkodo
  19. zlatkodo

    NEMA Marks for Dual-Voltage Windings

    Does the attached diagram shows the correct NEMA marks ( 1 to 9 ) and internal connection for dual voltage, 9 leads , Delta, three-phase winding? http://img135.imageshack.us/i/engtips.png/ Thanks in advance Zlatkodo
  20. zlatkodo

    AGP in Rewind Data

    What does the value of AGD ("air gap diameter") in the motor rewind data? One example is attached. Zlatkodo

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