Remeber to bolt down your motors!
Remeber to bolt down your motors!
(OP)
I have been playing around with my little Casio EX-FC100. It is a decent little camera. Like most other 300 dollar cameras. But it has a feature that I will be using a lot when analysing problems with drives and loads. It can record at 410 frames/second. Even 1000 fps if you can accept a poorer resolution.
I filmed a DOL start of an induction motor. It jumped. I then reversed it. It jumps even higher and things on the table partake in the jumping.
It is interesting to see that it goes from 1000 RPM FWD to 1000 RPM BWD in less than half a revolution.
Go to http://www.gke.org/pub/ and select motor reversing.avi.
The file is quite large - around 9 MB. You have been warned.
I filmed a DOL start of an induction motor. It jumped. I then reversed it. It jumps even higher and things on the table partake in the jumping.
It is interesting to see that it goes from 1000 RPM FWD to 1000 RPM BWD in less than half a revolution.
Go to http://www.gke.org/pub/ and select motor reversing.avi.
The file is quite large - around 9 MB. You have been warned.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...





RE: Remeber to bolt down your motors!
Curt Wilson
Delta Tau Data Systems
RE: Remeber to bolt down your motors!
It is interesting that the torque loop of a good vector control is so much better than the DOL. The explanation is, of course, that a good vector control takes care of the internal voltage drop (in Rs and Ls) so that the air gap voltage is delivered with no influence from stator parameters. Hmm.. now, where did I put that NFO drive?..
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Remeber to bolt down your motors!
I can only think of one problem where we wanted high speed camera. Breaker was tripping for unknown reason upon starting. One of many postulated causes was abnormal vibration of the contactor influencing the breaker. Seems like 1000 fps would be fast enough to evaluate that (especially if comparing to a sister)
What other sort of problems might this be useful for troubleshooting?
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RE: Remeber to bolt down your motors!
Keith Cress
kcress - http://www.flaminsystems.com
RE: Remeber to bolt down your motors!
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RE: Remeber to bolt down your motors!
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Remeber to bolt down your motors!
We recorded some ground fault tests in MV switchgear at 2k FPS once, it was like watching performance art.
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
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RE: Remeber to bolt down your motors!
http:/
Mike Halloran
Pembroke Pines, FL, USA
RE: Remeber to bolt down your motors!
I still remember the morning after we switched to electronic ballasts for our fluorescent lighting in the mid 90s -- our top programmer was in a near panic because he thought he couldn't lock in on speed any more.
Curt Wilson
Delta Tau Data Systems
RE: Remeber to bolt down your motors!
"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg
RE: Remeber to bolt down your motors!
Reminds me of the classic engineer joke with the bicycle and the naked girl.
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Remeber to bolt down your motors!
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Remeber to bolt down your motors!
I sacrificed a perfect can of beer for you - and for science. Go to http://www.gke.org/pub/ and download the exploding beer can. Not Cheer-leaders, but you can't have it all
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Remeber to bolt down your motors!
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RE: Remeber to bolt down your motors!
By the way here are some reviews:
http:/
As expected it is not perfect. Big complaint seemed to be focusing. Also it needs a lot of light (what else do you expect for rapid shooting = short exposure time). It may not be a great all-around camera but certainly looks great for high-speed shooting.
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