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...
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...
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?
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...
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...
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...
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...
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...
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...
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...
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.
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...
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...
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...
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...
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.)
