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. bklauba

    Powering sync motor with VFD

    We have been working with a new PM sync motor, which has very good speed control (can tune the speed in increments of 2 RPM up to 8 KRPM) when run open loop. ( ! ! ! ) For previous apps of ours, we have used BLDC with a resolver, but have wanted to get away from using resolvers. Our app...
  2. bklauba

    vibratory Stess relief - attn bklauba

    Tmoose, I am sorry I did not respond before; been busy with many matters including VSR apps. The lack of ductility, both of the parent material and the overlay, makes if a tough app at best. Reviewing the image, is item 12 the candidate workpiece? Can you supply approximate dimensions...
  3. bklauba

    Thermistor protection req'd in Class II Div II Group F or G ?

    Thanks to all for replies, and sorry for not stating location, which is USA.
  4. bklauba

    Thermistor protection req'd in Class II Div II Group F or G ?

    Do electric motors to be used in a Class II Div II Group F or G environment require more than mere short circuit and overload protection, i.e., do they require thermistor protection also?
  5. bklauba

    Vibratory Stress Relief

    Geesamand is right: Resonance is the key to making VSR work. Some of the newer touchscreen controlled VSR units make following the best procedures much easier, by clearly displaying workpiece resonances, and how they grow a/o shift (or new peaks develop) with treatment, which then results in a...
  6. bklauba

    Vibratory Stress Relief

    The following website should help clear the air: www.advancedvsr.com Several areas of regular and successful application include hydroturbine components, lifting devices / yokes and paper mill machinery. It is a bit hard to explain why so many companies use the VSR Process, while clearly...
  7. bklauba

    Hydrogen Cracking Types

    Below is an excerpt found AcelorMittal's North American website, in their white paper "How to weld T-1": ‘Generally, welded structures of ArcelorMittal USA “T-1” Steels should not be given a postweld heat treatment. Loss of weld-metal and heat-affected-zone toughness and stress-rupture...
  8. bklauba

    Short term step up

    Our shop has 240 3 ph 60 Hz, and we need to run a short term (several 5 minute tests) on some equipment needing 480 3 ph. We have a disconnected distribution transformer, 480 Y / 240 delta 150 A secondary, which is at least 30 times the ampacity needed for the test. Is it OK to backfeed...
  9. bklauba

    Overload protection - grizzly vibrator

    Grizzly vibrators applications normally require some pretty rugged hardware. Asking a gearbox to adjust the motor speed to the required vibration speed needless complicates things: You would be better off using a vibrator with the correct speed initially, and if some adjustment is needed, go...
  10. bklauba

    Residual Stresses from Quenching

    To EdStainless: Perhaps we are talking semantics here, perhaps not. Below is a link to one of the most sited research papers on vibratory stress relief, authored by Dawson and Moffat. Doug Moffat sent a high-quality original to me several years back, so it could be scanned and included in the...
  11. bklauba

    Residual Stresses from Quenching

    Addressing arunmrao's statement: "Vibratory stress relief is not an option for stainless steels." Vibratory stress relief is very commonly applied to stainless steel fabrications, due to the problems associated with using PWHT on such components. The options are to use what is called a...
  12. bklauba

    How do I hook up this DC mtr?

    If it was a compound motor, reversing with mere exchange of polarity of DC feed to armature leads (called out on the wiring diagram) would be unacceptable, since there would be a highly preferred direction of rotation, efficiency wise.
  13. bklauba

    How do I hook up this DC mtr?

    The doc opens using MS doc imaging, since its a tif. Motor appears to be a reversible type, with separate supplies required for the field and armature. No specs means no idea of what voltages or currents are involved. Polarity of field is likely, but certain, achieved with neg connected to...
  14. bklauba

    Mondo solenoid - up in smoke?.

    itsmoked, Its worth a try. Moisture is almost certainly the culprit. One thing to be careful of, esp. during these transition periods from one season to the next, is to place the baked and now cooling magnet in a dry area to reach room temp. I've seen stators check AOK when pretty fresh out...
  15. bklauba

    Stress Relief vs. Normalization

    DMiller01, You might want to download the paper found at this link: http://www.vsrtechnology.net/influence-of-vibratory-treatment/ Thermal stress relief fared rather poorly against vibratory, in enhancing fatigue life in this study. Your workpiece would also lend itself well to the VSR...
  16. bklauba

    Stress Relief vs. Normalization

    Here is the URL of the work by Dawson & Moffat. It now works. http://www.vsrtechnology.net/wp-content/uploads/dawson-moffat.pdf BK
  17. bklauba

    Stress Relief vs. Normalization

    reb1, Look at the website I sited ( www.vsrtechology.net ). Open the link and go to the technical library. Probably the best work that might surprise you is that of Dawson and Moffat. They took numerous samples of 3 different alloys, and succeeded in removing 90% of the stresses initially...
  18. bklauba

    Stress Relief vs. Normalization

    Another option you have is to vibratory stress relieve it. No loss (or gain) of phys properties. See www.vsrtechnology.net BK
  19. bklauba

    how to determine if DC mtr is PM

    Another way is to turn the motor by hand, and then short it. If it is much harder to turn, it is a PM. Works for both brushed and brushless.
  20. bklauba

    42 V 3 ph motor?

    We got some inquires for rotary electric vibrators, using 42 VAC 3 phase. Anyone heard of such service? Where is this used? (We thought this inquiry was a typo, then we got a few more.)

Part and Inventory Search

Back
Top