Activity
I’m sad, angry, disgusted.
Get the murdering bastards, bring them to trial and give them a lifetime sentence. Death is too good for them.
Ron van Sommeren
Druten, the Netherlands
A new http://www.aircraft-world.com outrunner kit, also available (cheaper) from http://www.eflypower.com (AUS):
aircraft-world.com/…/ac-diykit-01.htm
Assembly manual, also useful for other cd-rom like motors:
http://www.eflypower.com/mini2.pdf
large diam. 9, 12,24 statorpole site, very useful building instructions and tricks:
www.rcgroups.com/forums/showthread.php?t=270603
I added Takao Shimizu’s and Quax’ new diy brushless controller designs to the following compilation:
www.rcgroups.com/forums/showthread.php?t=140454
See
www.torcman.de/index_e.htm
-> link “TM configurator”
A new lrk kit manufacturer, Frank Schwaab started his own business. Frank was one of the very first to have built a lrk motor after the initial publiction of the original lrk designs in the German Elektro Modell magazine (articles www.torcman.de/peterslrk/index_eng.html , bottom of page). He also helped a lot of do-it-yourself lrk builders via www.rclineforum.de . Frank also designed the outrunner motors for www.high-torque.de / www.high-torque.com
Motors are completely built, kits on request:
www.shp-motoren.de
nc-schwaafr@netcologne.de
More brushless explanation:
www.legallou.com/Brushless/controleur/AN857a.pdf
www.rcgroups.com/forums/showthread.php?t=262709
Met vriendelijke groet 😉 Ron
A very active discussion on do-it-yourself brushless controllers, especially the ‘Quax’ controller:
home.versanet.de/~b-konze/
www.rcgroups.com/forums/showthread.php?t=200567 (Please ignore my stupid remark in that discussion 😉 )
More d-i-y brushless controller designs:
www.rcgroups.com/forums/showthread.php?t=140454
Peter Rother on brushless controllers:
www.torcman.de/peterslrk/SPEEDY-BL_eng.html (English)
www.torcman.de/peterslrk/SPEEDY-BL.html (Deutsch)
Met vriendelijke groet 😉 Ron van Sommeren
Nijmegen, the Netherlands<span style=‘font-size:8pt;line-height:100%’>
• do-it-yourself brushless motors
• int. electric fly-in, Nijmegen, the Netherlands</span>
Checks and tests to perform before connecting cd-rom/lrk motor, controller and battery. The thread will also answer lots of questions you might want to ask:
www.rcgroups.com/forums/showthread.php?t=254476
The number of statorpoles (=statorteeth) must be a multiple of 3. The number of magnetpoles must be even, a multiple of two. As for the number of magnetpoles versus the number of statorpoles and the according winding diagram, see:
www.alexrc.com/nutpol_e.htm
We Dutch are the polyglots of the world 😉
But don’t tell anyone, this is also very useful:
babelfish.altavista.com/babelfish/tr
There’s lots and lots of cd-rom discussion going on in the ‘power systems’ subforum at www.ezonemag.com , see:
www.rcgroups.com/forums/index.php?topic=ezone
Met vriendelijke groeten 😉 Ron van Sommeren
Our annual electric fly-in & do-it-yourself motor meeting:
home.hetnet.nl/~ronvans/
Tests and checks to perform before connecting motor, battery and controller:
www.rcgroups.com/forums/showthread.php?t=240993
An 8 teeth stator will not work with RC controllers because these are 3-phase controllers. The number of statorteeth must be a multiple of 3: 3, 6, 9, 12, 15 etcetera.
The smaller the airgap between the teeth and the magnets, the higher the magnetic flux that flows in the airgap. This results in a lower Kv (rpm/Volt) and higher Kt(torque/Ampere). 0.5mm is normal for the usually larger lrk style motors, I’ve seen 0.1-0.3mm in the ‘power systems’ subforum at www.ezonemag.com
Vriendelijke groet 😉 Ron van Sommeren
homebuilding brushless e-motors
electric fly-in, Nijmegen, the Netherlands
From this winding diagram table, in English:
www.alexrc.com/nutpol_e.htm
You can use 10 or 14 magnetpoles, lrk motor, a very useful assembly/winding manual:
www.torcman.de/motoren/manuals/anl_eco_200e_scr.pdf
Or you can use 16magnetpoles (for torque) or 8 (for rpm) and wind ABCABCABCABC (extended cd-rom
This is a very good cd-rom site, in Polish, German and English:
www.alexrc.com
Or this winding diagram calculator:
www.maltemedia.de/brushless/wicklungsschema/
(nuten = teeth)
Vriendelijke groet 😉 Ron van Sommeren
homebuilding brushless e-motors
electric fly-in, Nijmegen, the Netherlands
Brushless ESC design, by user ‘Quax’, discussion AND success:
www.rcgroups.com/forums/showthread.php?t=200567
More diy designs:
www.rcgroups.com/forums/showthread.php?t=140454
Motor winding diagram table in English. Winding notation and colours explained at bottom of page:
www.alexrc.com/nutpol_e.htm
A discussion about the toxic and fire risks when grinding/cutting Neo
magnets, precautions to take. The discussion starts here:
www.rcgroups.com/forums/showpost.php?p=2214578&pos…
www.rcgroups.com/forums/showpost.php?p=2214578&pos…
www.rcgroups.com/forums/showpost.php?p=2214578&pos…
www.rcgroups.com/forums/showpost.php?p=2214578&pos…
www.rcgroups.com/forums/showpost.php?p=2214578&pos…
www.rcgroups.com/forums/showpost.php?p=2214578&pos…
www.rcgroups.com/forums/showpost.php?p=2214578&pos…
A ‘disk-runner’ design, no fluxring but a flux-disk:
www.rcgroups.com/forums/showthread.php?t=227057
That circuit diagram is good food for the Ezone do-it-yourself electronics subforum 😃 See:
www.rcgroups.com/forums/forumdisplay.php?f=199
A cd-rom conversion tutorial:
www.gobrushless.com/Tutorial_Stock_Single.doc
Correct Alexander. Here’s the explanation:
groups.yahoo.com/group/lrk-torquemax/…/4913
English version of table:
www.kcflyingcircuits.com/…/windingdiagram.html
A bit more explanation about the uppercase and lowercase character notation used in the table:
groups.yahoo.com/group/lrk-torquemax/…/4913
The homepage is also available in Russian language 😃
www.magnesy.pl/RU/index.htm
A table listing the winding diagrams for different teeth-magnetpole combinations:
fast-results.com/lnl/nutpol.htm
Pole = #magnetpoles
Nuten = #teeth
Untersetzung = ‘reduktion’ (cannot be compared to mechanical gearbox reduction)
ungünstige Kombination = bad combination
geht nicht = will not work
Step through the sequence or maximise your window to get the speed down:
www.servomag.com/flash/…/2pole-bldc-motor.html
www.servomag.com/flash/4-pole/smi-motor007.htm
CD-rom outrunner motor simulation, different colours for different magnetic field strength
(bigger version of simulation, colours explained)
LRK outrunner simulation
Thin neomagnets, 1.0, 1.2, 1.5, 1.8mm:
www.magnesy.pl/cennik/MPL_NdFeB.htm
That page is in Polish, the homepage is also in English.
www.magnesy.pl
A second direct drive motor, this time from two 5.25" floppy drives. Polish and German text:
alexrc.com/voytek_pl.html
Finally, a source for cd-rom kits, shafts, wire, magnets etc:
www.gobrushless.com
Discussion that goes with it:
www.rcgroups.com/forums/showthread.php?s=&threadid…
The ‘distributed wind’ method gives some kind of 6-phase effect, www.flyware.de uses it in their lrk motors.
Instead of say 20 winds on one tooth, you do 10 on one and 10 on it’s neighbour. This distributed winding method will give better efficiency because the ‘winding heads’ are smaller. Less useless copper: lower weight and lower resistance, especially for ‘thin’ motors where the ‘winding heads’ are relatively large (imagine a 2mm thick stator). Kv will go up by about 10%.
There’s a third way, it involves three teeth: 50% on the center tooth, 25% of the winds on it’s neighbours.
There was an article in the German www.aufwind-magazin.de . You’ll find scans of that article here:
www.yahoogroups.com/group/lrk-torquemax/
-> files
-> Aufwind Magazine
More winding diagrams here:
www.mfly.de/services.htm
…как он обмотки включает?
AaBbCcaAbBcC
A brushless outrunner with variable pitch prop, nice movies too:
www.slope-combat.de/tortelonitti/
Realplayer movies:
www.slope-combat.de/tortelonitti/knoten.rm (4MByte)
www.fun-fly-team.de/tortelonitti.rm (1MByte)
Hi Balal, I thought I’d mention the book, I don’t know how many of you read German. I offered to translate it in English but did not get a reply 😦
Hi all,
A very good booklet (in German) on the subject of diy brushless motors, by Ludwig Retzbach, the ‘R’ in LRK:
www.dmfv.de/de/shop/buecher/d6.html
Rewinding cd-rom motors for high rpm in 50 mm ducted fans for electric jets. 6 magnetpoles instead of the standard 12magnetpoles for more rpm:
www.rcgroups.com/forums/showthread.php?s=&threadid…
www.rcgroups.com/forums/showthread.php?s=&threadid…
www.rcgroups.com/forums/showthread.php?s=&threadid…