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Recent content by starkopete

  1. starkopete

    Part-winding connection

    Hi, I haven't had time to verify it but I'm pretty sure I've seen that connection on a dual voltage 230/460 volt delta connected motor. The connection that you show was used to run the motor on a 575 volt circuit. 1, 2, 3, were lines, 10, 8, 5 were together as were 11, 9, 6, and finally 4, 7...
  2. starkopete

    cleaning stator slot

    Have you considered dry ice blasting? We've had good luck with it cleaning cores that didn't completely clean-up after B.O. process.
  3. starkopete

    Two-Speed Constant Torque Winding

    Hi, I checked with one of EASA's Engineers and he gave me the following reply: "NEMA uses an artificially simple 2:1 or constant torque, and 4:1 for variable torque, where the IEC motors use the actual torque / KW ratio instead." Based on that reply the answer to your OP would be yes, the...
  4. starkopete

    Two-Speed Constant Torque Winding

    Hi Zlatkodo, Now I'm really going to confuse things. From a WEG motor catalog in reference to Dahlander two speed motors: "Constant torque: Torque is constant on both speeds and rated power ratio is 0.63:1 In this case, motor has a D/YY connection. Example: 0.63/1HP motor – IV/II pole -...
  5. starkopete

    Two-Speed Constant Torque Winding

    Figures 03 & 04 on the link below show both the D/YY and Y/YY Dahlanders connection. It appears that the connection depends on application. http://www.tiba.si/en/clanki/priklopi-trifaznih-asinhronskih-motorjev.html Thanks
  6. starkopete

    IR and PI measurement procedure

    Here's the link for the IEEE Standard. http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=836297 Thanks
  7. starkopete

    Voltage drop in service entrance wire

    Hi, This is the NEC. http://www.dolphins-software.com/IEEE_ExactFormulae.htm Thanks
  8. starkopete

    Baker Explorer Torque Measurements

    Hi, This is from the report in the attached link: The Explorer "estimates torque from the instantaneous product of current magnitude and voltage magnitude." The report deals with efficiency readings but it does compare the Explorer (and others) to actual dyno tests. I hope it helps. Thanks...
  9. starkopete

    Motor with rectangular slots

    Hi. Motorwinder is giving you good advice. I'd like to add - that if you have room in the slot, cut your slot liners above the laminations so you can fold them over the top of the coil and then your "wedge" will hold it down. Thanks
  10. starkopete

    Need Opinion On How To Disassemble Motor

    Hi, I'm not a big fan of 'miracle' lubricants and such, but Mike H. is right, AeroKroil is an amazing product. It does an excellent job of freeing up metal to metal parts. You will be amazed at how well it works. Thanks
  11. starkopete

    Need Opinion On How To Disassemble Motor

    Hi, If you look at the puller in the attachment you can see the collars/hub adapters, these can easily be made. The groove in your fan hub will provide an excellent spot for the bolts to grip. A little heat will help when you go to pull it...
  12. starkopete

    Inverter-Duty Motor Repair

    rhatcher, We do exactly the same thing here. Another thing we do that isn't mentioned in the article is we VPI all rewinds. As you say, it is cost effective in the long run, it gives us confidence in our work and we are giving our customers a better product. Thanks
  13. starkopete

    Vbelt and Pulley Design

    Hi, Please disregard my erroneous rule of thumb above. I decided to do some checking (my memory isn't what it used to be) and found the link below. The second article should help with your question of distance between pulleys. Thanks http://icemeister.net/Articles/FYI/Belt_Length_Changes.pdf
  14. starkopete

    Vbelt and Pulley Design

    Hi, I seem to remember a rule of thumb that said the minimum center to center distance has to be twice the diameter of the larger pulley. Thanks
  15. starkopete

    Inverter-Duty Motor Repair

    Here's the link: http://www.toshont.com/ag/mtrldesign/AG37EM.pdf
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