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Cathi Austin
01-09-2007, 05:33 AM
1. What is the advantage of winding stator ABC ABC ABC as opposed to Abc Abc Abc?
2. How do you wind a 12 tooth stator? Do you wind one additional phase?
3. What is a good air gap in thousands?

rca
01-09-2007, 06:20 PM
A good place to start to understand all this would be the CD Rom Tricks (http://www.rcgroups.com/forums/showthread.php?t=240993) threat at RCG. There is also a really good thread about DIY motor tool and part sources (http://www.rcgroups.com/forums/showthread.php?t=454778) at RCG, worth reading.

To answer your questions:

1. The ABC vs. abc terminology is not normally important in a 9 pole stator wind. It is usually used to indicate the difference in winding one too clockwise - A - and another tooth counter-clockwise - a. This makes a difference when you are winding a DLRK motor for a 12 tooth stator, but on the 9 pole stators the common wind is to do each tooth the same direction. So either ABCABCABC or abcabcabc. It doesn't really matter which direction you wind as long as you are consistent.

2. A 12 tooth stator can be would like a 9 pole stator with one extra phase, so ABCABCABCABC or it can be would in an LRK or DLRK fashion. With the normal wind you need to use 16 magnets in the bell. If you go with a DLRK wind, which winds adjoining tooths with the same wire, but in opposite directions you use 14 magnets (I think you can use 10 magnets also). That wind is AabBCcaABbcC. The LRK wind is 6 poles out of the 12. Morris wrote a good DLRK tutorial with pictures (http://www.rcgroups.com/forums/showthread.php?t=523039&highlight=dlrk) over at RCG.

3. Not sure I can answer this. I work mainly with standard parts from either GoBrushless or Komodo, so I just assume their air gap is OK. Somebody will probably chime in on this for you. I do know that the standard magnets on a 22.7mm can are 5x5x1 flaties. The 20mm cans you can use 5x5x.75 or 5x4x1 flaties. The GBx single motors use 5x4x2 flaties. There are also curved magnets available for the 22.7mm and 20mm cans, I got some from Don at StrongRCMotors (http://www.strongrcmotors.com), they work great.

Hope that helps.

Ron

ron_van_sommeren
01-09-2007, 08:34 PM
AbcAbcAbc just won't work, that's all ;) Every combination of number of statorpoles and number of magnetpoles has one or more winding diagrams asociated with it. Mind you, not every combination is optimal, see this table:
www.powercroco.de (http://www.powercroco.de)
-> tools & links
-> kombinationstabelle

Excellent motor building articles by Brian Mulder, a must read, will prevent you from asking a lot of questions :-)
http://www.southernsoaringclub.org.za/
-> Articles by SouthEasterners.
-> Electric Motors - part 1-5

Do-it-yourself motor homepages, manuals/tutorials, checks and tests in the first message of this motor builders tips and tricks thread. The checks and tests may save you from frying your controller or motor. Thread is active, bookmark it for future reference and subscribe to it:
http://www.rcgroups.com/forums/showthread.php?t=240993 (sticky thread, at top of subforum)


Vriendelijke groeten ;) Ron
diy brushless motor discussion group (http://www.yahoogroups.com/group/lrk-torquemax)
Drive Calculator (http://www.yahoogroups.com/group/D-calc/) download & discussion group
int. E fly-in & diy outrunner meet (http://home.hetnet.nl/%7Eronvans/), Aug.26 2007, Nijmegen, the Netherlands