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Old Jan 14, 2006, 01:59 PM
Ron van Sommeren is offline
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eddy current effect demo videos


Some nice videos demonstrating the huge effect of eddy currents (a.k.a. Foucault currents) and the benefits of statorlamination (insulated thin sheets of iron, not a massive iron stator/transformer) or even rotor/magnet 'lamination'.

Eddy current losses explained
en.wikipedia.org/wiki/Eddy_current

Magnet falling through metal pipe
www.wimp.com/copperpipe/

Effects of laminations:
demoroom.physics.ncsu.edu/html/demos/163.html
Eddy current brake:
demoroom.physics.ncsu.edu/html/demos/192.html
More eddy current demos under '5K20'
demoroom.physics.ncsu.edu/html/electricity_and_magnetism.html

groups.yahoo.com/group/lrk-torquemax/message/14
groups.yahoo.com/group/lrk-torquemax/message/166

www.vuw.ac.nz/scps-demos/Demos/Pira5K/EddyCurrentTubes/Aluminium.mp4

www.supermagnete.de/eng/project66?switch_lang=1

www.engconcepts.net/
-> SuperMagnetMan Magnet University.
-> Magnet Brakes its Own Fall
and
-> Magnet Braking System

DIY eddy brake dynamometer design for testing e-motors
www.aerodesign.de/peter/2001/LRK350/index_eng.html
-> bottom of that page
-> EM 4/2001 Performance Measurements on Electric Motors

Something you can do yourself. Just let a Neodymium magnet slide down a metal (non-ferrous) tube or a length of angled metal and then let it slide down a plastic tube and see the difference. First an aluminium ring than a magnetic ring
video.google.com/videoplay?docid=1660843971041561797&q=neodymium&hl =en

Demo in MRI scanner
MRI MAGIC (0 min 15 sec)


Vriendelijke groeten Ron
diy motor building tips & tricks
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int. E fly-in & diy outrunner meet, June 25 2006, Nijmegen, the Netherlands
Last edited by Ron van Sommeren; Feb 28, 2016 at 06:53 PM.
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Old Jan 15, 2006, 12:30 AM
ScubaSteve is offline
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Great info. Thanks Ron.
Old Jan 15, 2006, 11:34 PM
fly_boy99 is offline
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Where is Inewton to talk about magnet gear ratios???

Old Jan 16, 2006, 08:56 AM
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Hey fly_boy99,

After seeing Ron's great demo, are you now going to keep all your aluminum parts out of the magnetic path?

To keep things a bit simpler for you the best way to identify magnetic loss is by spinning the motor with a high speed grinder motor (I read that somewhere) and finding out what parts get hot.

To fix the 283, you need to modify the bearing tube, laminate the flux ring and use two half magnets,14x3 mm, instead of a full 14x6.

Then to keep the peak magnetic (and current) pulses down to the lowest level, switch from a wye to a delta.

Or, do you prefer flying with a motor/toaster?
Old Jan 16, 2006, 12:44 PM
fly_boy99 is offline
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Don't have a 283 and mount my stators with CF...

How you like those apples???

I have not found one person on RCG that believes in your magnetic gear ratios either!!!
Old Jan 16, 2006, 02:33 PM
Ron van Sommeren is offline
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Quote:
Originally Posted by INewton
... After seeing Ron's great demo, are you now going to keep all your aluminum parts out of the magnetic path?...
Or any other conductor/metal. But there's no problem if the metal does not move in the magnetic field.

Vriendelijke groeten Ron
Old Jan 16, 2006, 03:04 PM
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Quote:
Originally Posted by Ron
Or any other conductor/metal. But there's no problem if the metal does not move in the magnetic field.
OR the magnetic field doesn't vary!
Last edited by INewton; Jan 16, 2006 at 05:58 PM.
Old Jan 19, 2006, 03:37 PM
Ron van Sommeren is offline
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Something you can try yourself. Just let a Neodymium magnet slide down a metal tube or a length of angled metal and then let it slide down a plastic tube and see the difference.

Vriendelijke groeten Ron
Old Apr 19, 2008, 12:30 PM
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Added a few videos of demos.
Old Apr 25, 2008, 10:29 PM
NX-687 is offline
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Hi


Quote:
Originally Posted by INewton
Hey fly_boy99,

After seeing Ron's great demo, are you now going to keep all your aluminum parts out of the magnetic path?

To keep things a bit simpler for you the best way to identify magnetic loss is by spinning the motor with a high speed grinder motor (I read that somewhere) and finding out what parts get hot.

To fix the 283, you need to modify the bearing tube, laminate the flux ring and use two half magnets,14x3 mm, instead of a full 14x6.

Then to keep the peak magnetic (and current) pulses down to the lowest level, switch from a wye to a delta.

Or, do you prefer flying with a motor/toaster?
Were you serious when you said laminate the flux ring , because that was poo ,pooed in a discussion a few months back
Old May 29, 2008, 03:36 PM
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Added:
http://www.supermagnete.de/eng/project66?switch_lang=1
Old Jul 14, 2009, 06:29 PM
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Eddy currents explained:
http://en.wikipedia.org/wiki/Eddy_current
Old Jul 29, 2009, 11:39 AM
Ron van Sommeren is offline
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Added to first post
http://www.engconcepts.net/
-> SuperMagnetMan Magnet University.
-> Magnet Brakes its Own Fall
and
-> Magnet Braking System
Old Jul 29, 2009, 11:41 AM
Ron van Sommeren is offline
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Added
DIY eddy brake dynamometer design
http://www.aerodesign.de/peter/2001/...index_eng.html
-> bottom of that page
-> EM 4/2001 Performance Measurements on Electric Motors
Old Jul 29, 2009, 12:10 PM
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I won a $5 bet with my kids that my "magic" metal cylinder would take 10x longer to pass through an aluminum tube than a another "regular" metal cylinder!
Like taking candy from a baby!.


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