Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. motorman

    Motor Varnish / Epoxy Suggestions

    Try http://www.dolphs.com/dolphs_varnishes_epoxies_resins.cfm
  2. motorman

    Fungus Proofing and Tropicalization of motor windings

    Tropicalization, refers to treating the windings to inhibit fungus and mildew growth. It is a common requirement for electrical equipment that is shipped to remote tropical areas that will not be immediately energized. I seen some awful thick fungus growth on windings appear in just a couple...
  3. motorman

    motor cool time constant

    Customers often ask for cooling time constant for our machine, where MULTILIN protection is used. The time constant should be defined as removing the heat to a level of 1/e (i.e. 36.8%)…or 63.2% total heat removed. The temperature drops at an exponential rate. The time constant is based on...
  4. motorman

    World's Largest AC Motor

    How about the motor at Arnold Air Force base. Two 83,000HP coupled to two 60,000HP for a total of 286,000HP http://www.arnold.af.mil/shared/media/document/AFD-070131-089.pdf.
  5. motorman

    Need info on old Westinghouse Generator

    If it is a turbo-generator, Siemens-Westinghouse in Orlando has the records. Otherwise, TECO-Westighouse would be the source.
  6. motorman

    LV Motors require space heater at Peru, South America?

    This high humidity environment most certainly requires space heaters. Also, per NEMA 20.29.3, salt-laden air and damp locations are considered as “Unusual Service Conditions”. Meaning that by not specifying space heaters for this area [AND using them!] could be considered has faux pas on the...
  7. motorman

    Shell Lube oil for Alternator sleeve bearings

    Turbo T 46 http://www.shell-lubricants.com/products/pdf/TurboT.pdf
  8. motorman

    400HP Frame

    NEMA protects the user from such manufacturing errors. I suggest that your supplier read it. Reference: Section I GENERAL STANDARDS APPLYING TO ALL MACHINES Part 4—DIMENSIONS, TOLERANCES, AND MOUNTING … 4.9 TOLERANCES ON SHAFT EXTENSION DIAMETERS AND KEYSEATS 4.9.1 Shaft Extension Diameter...
  9. motorman

    Large Motor Testing Facility

    Referring to IEEE 112-5.2.2.5 Briefly, this is a test designed to determine efficiency. But it can also be used to investigate “hot” conditions using shaft loading. Two machines are coupled together and connected to two separate power sources with the frequency of one of the sources being...
  10. motorman

    Large Motor Testing Facility

    If you are still looking for another source, I suggest that you go ahead and give TECO/Westinghouse a shout. On a motor this size, they can do the back-to-back test using one of their 1000hp, 2pole production units that happens to be going done the line at the same time you need the test done. I...
  11. motorman

    Shaft replacement in small motor

    Be careful which direction you choose to push the shaft out. That is because when the core laminations are stamped, the die produces a burr. When the core is stacked, the manufacture knows which side of the punching the burr is on and insures that the burrs are all going in the same direction...
  12. motorman

    Bearing oil sightglass venting question

    The Westinghouse 5000, 5800 and 6800 frame series vertical motors used non-contact, labyrinth shaft seals. So there is no seal lip to wear out and no chamber vent to get clogged. If you only notice the drips after the machine has just been shut down from a run but not when the machine has been...
  13. motorman

    Bearing oil sightglass venting question

    I apologize for the long winded answer and the repeating of your original questions but felt it was the best way to respond and not forcing everybody to have to scroll up and down. “This is an indoor 4kv vertical motor manufactured by Westinghouse with oil-lubricated upper and lower bearings “...
  14. motorman

    Truing an out of round commutator

    We use these. A little expensive for one time use. http://www.martindaleco.com/html/CommutatorGrinders/CommutatorGrindingandTurningTools.htm A comment about hooking up to a welder. Yes, it works but watch out for dangerous, blinding, flash over. Many years ago I watched a service engineer do...
  15. motorman

    IEC / IEEE Testing

    For efficiency testing, IEEE 112, Method F uses the equivalent circuit of the induction motor to determine its performance from circuit parameters established by test measurements. This test provides acceptable accuracy for starting and running performance. It also should yield the most...
  16. motorman

    babbit bearing temp limits - especially Renk UpperGuide brg

    The whitemetal used on these bearings is Renk metal “therm89”. This material is similar to ASTM B-23 Grade 2. The melting temperature is 233 to 360°C with a pour temperature of 460°C. The Renk applications manual say that the admissible temperature can be set up to 125°C with embedded type...
  17. motorman

    Oil seepage from bearing into motor

    I am basically just reiterating what has already been said. From what I have seen, the most frequent causes for oil being pulled from Renk bearings into the motor are: 1. The air vent holes are plugged. There are two holes in the mounting flange on the Renk bearing approximately on the same...
  18. motorman

    cleaning motors in service

    Ep, I was referring to an instance where a motor user – or *gulp* even a service engineer – would put too much oil in the upper oil pot, the oil would run over the standpipe and onto the windings and rotor. We would clean the oil up by squirting freon , which was applied from a hand pumped bug...
  19. motorman

    cleaning motors in service

    Back in the “old” days, we would spray freon into the air intake to dislodge dirt and dissolve oil. Had to do this several times when the upper oil pot on a vertical machine would get over filled. I doubt you would be allowed to do such a thing today.
  20. motorman

    Convert KvA to amp

    Try this site! http://www.macgen.com/calcul.html

Part and Inventory Search

Back
Top