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Tractor Talk Discussion Forum

Re: Reversing the rotation on a generator-How do you do it?

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JMOR

04-19-2013 05:38:19
72.181.173.171



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Quoting Removed, click Modern View to seeThere is MORE to it than these other posters seem to know. The brushes are angled relative to centerline of commutator. That angle is opposite for CW vs CCW rotation. Also, the relationship of the field produced by field coils relative to armature reaction field will be all wrong when rotated opposite of direction that it was designed to rotate. Minor detail, but fan different too. In other words, they are differently designed generators. Compare a 1962 standard generator to the 1962 Corvair generator.

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John T

04-19-2013 06:03:44
216.249.82.117



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 Re: Reversing the rotation on a generator-How do you do it? in reply to JMOR, 04-19-2013 05:38:19  
Exactly, once the brushes get worn down at an angle due to the relatively loose fit in the brush holders if you reverse direction there can be problems. Brushes Ive replaced are worn at one angle based on direction of rotation. When all is new the brushes havent yet worn down to one angle however. Likweise the fan is moving air in one particular direcion but I doubt overheating problems, just cant say on that one.

Fun sparky chat

John T

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JMOR

04-19-2013 07:07:41
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 Re: Reversing the rotation on a generator-How do you do it? in reply to John T, 04-19-2013 06:03:44  
There is much more to it than 'how brushes wear'. As I said earlier the armature reaction field will be in wrong position, resulting in insufficient output, excessive brush arcing, etc. A different design for CW VS CCW rotation. The illustration shows the brush lead.
[URL=http://s192.photobucket.com/user/JMOR_photo/media/Charging/brush_posn_vs_rotation.jpg.html][/URL]

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John T

04-19-2013 07:27:17
216.249.82.117



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 Re: Reversing the rotation on a generator-How do you do it? in reply to JMOR, 04-19-2013 07:07:41  
GOTTA LOVE THIS FUN SPARKY CHAT EVEN IF OTHERS ARE BORED TO TERARS LOL

At the very least it could help and maybe work if the brushes were removed and reversed 180 so the angle would be more in line. An old genny I have down in the shop has the brushes like 90 degrees up to the commutator (unlike your first drawing more like second) and its brush wear has only a slight angle due more to the fact that the brushes arent fit prefectly tight into the holders. Of course I have no idea of that gennys model nor the one the poster has nor the one in your picture etc etc so I just cant say sittin here how well his will work, but at the least I can continue to say there could be a problem due to brush angle, regardless if his brushes are perpendicular or angled and at the least Id consider reversing the brushes 180 in their holders or install a new set that hasnt worn into any sharp angle and that could indeed work. Or if his brushes havent yet worn too much of an angle and are closer to perpendicular HECK IT MAY BE OKAY AS IS LOL

HOPE HE LETS US KNOW

Best wishes, God Bless n thanks for the fun chat

John T

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