Electronics > Projects, Designs, and Technical Stuff
Making an induction motor go crazy fast.
mzzj:
--- Quote from: Ian.M on August 30, 2019, 07:39:20 am ---
--- Quote from: Circlotron on August 30, 2019, 03:57:14 am ---
Rotor is 70mm diameter and 60mm long. Shaft is 14mm. Out of an automatic sliding door like this one -> https://youtu.be/nKdHCjAEKuI?t=61
--- End quote ---
I've recalculated for your actual rotor - at 16800 RPM that's 138 MPH, 11000 g, 1650 J
Once you've got containment, it needs more volts and more Hz. >:D
--- End quote ---
Bog standard electric motors from most makes are rated to 4500 rpm up to IEC frame size 200. That is 50hp 300kg motor!
coppercone2:
whats the point of speeding them up anyway, I always wanted them slow so they can do useful things?
fast motors are a nuisance for all mechanical things other then tiny drill bits, which I assume need special bearings anyway for vibration
grinders?
Gyro:
--- Quote from: Yansi on August 31, 2019, 08:06:07 am ---They run hydrogen just inside the winding. No doubt about that.
Never heard of any use of hydrogen for such dangerous purposes in any practical generator, currently being used. Having hydrogen within the whole machine would be more than impractical.
--- End quote ---
Closed circuit inside the enclosure too, otherwise you wouldn't get the windage benefit...
https://en.wikipedia.org/wiki/Hydrogen-cooled_turbo_generator
https://www.power-eng.com/articles/print/volume-113/issue-6/features/hydrogen-cools-well-but-safety-is-crucial.html
https://www.quora.com/Why-hydrogen-is-used-for-generator-cooling
https://www.flownex.com/fnxdocs/casestudies/CS42_GeneratorSealOilSystem.pdf
P.S. This is for interest, not spoiling for a fight.... Or suggesting squirting Hydrogen into an induction motor! :)
Yansi:
Probably, only in one of the largest generator of them all, as cited in the [1] source on wikipedia, yes the may have done it. But never heard of that ever done anywhere else.
But all of the power plants in our country (that have blocks up to 1055 MW) do use only hydrogen cooled winding. So was I also taught at university, where I have studied power distribution, generation and electric drives.
When I try to dig for this further, I can confirm that our biggest 1055MW blocks indeed do have the whole* generator cooled by hydrogen atmosphere. Interesting. We've been told lies in the school!
*not really whole, but the rotor definitely is within a hydrogen atmosphere too
Miyuki:
Hi folks I have little question about induction motors
What limit maximum torque (breakdown torque) ? Is it just stator / rotor saturation ? Or have it other causes ?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version