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Help for a new member with 6 volt Delco genny

U

used red MN

Well-known Member
Location
Coon Rapids, MN
This new poster has a Delco generator question on the
Restoration and Repair topic section., see link. He is
asking about a ..motor test.. I am not familiar enough
with generator systems to answer. But he is saying the
generator turns backwards during the motor test,
which I believe is correct. What do those in the know
say? Or is the direction it turns a product of how the
unit was last polarized versus how he has it connected
in polarity to the battery.
New poster on Restoration section
 
It rotates the same way as on the tractor. Even the brushes are not designed to turn backwards.
 
If he is bench testing it does the direction it turns depend on how the battery is connected? They are not permanent magnet so I believe that means to shoe coils keep the direction of rotation the same no matter the polarity connection. Is this correct just as a starter does?
 
It would have to turn the same direction as it does on the tractor. On a starter/generator like on a Kolher engine. What determines the rotation is how the copper wire is wrapped around the field coils.

Many years ago I rebuilt a starter/generator, and the parts house sent me the wrong coils. The starter spun the engine backwards.
 
Not necessarily. I have seen several small engine starters that turn backward if the battery is hooked up backward.

It seems to depend on whether the fields are permanent magnets or coils. If permanent magnets, some will spin backward. I say 'some, because there was one with battery backward once on a Kawasaki that would spin the right way, but the engine would not start.
 
A friend had a starter repaired once and when he got it back it turned the wrong way. As I remember we switched the wires around between the field coils and the brushes and it ran the correct way. But that was over 50 years ago!
 
As this is an antique tractor website, not a small engine website, my response is in regards to antique tractors I have worked on. I have not seen permanent magnets in any of them. I switch positive grounds to negative grounds with no ill effects.
 
Polarity should not matter since a lot of old tractors are switched from 6v pos ground to 12v neg ground and still spin the correct direction. At least on these old tractors. Will not vouch for lawnmower engines those are junk anyway.
 
correct, reply to the question in the topic at hand. seams to be a common deal in posts to get way off topic.
 
Yes, it can be made to motor in the opposite rotation by swapping the two field wires. A person would not want to do this, as brushes will be at incorrect angle for the reversed rotation and there would likely be more brush arcing as the armature reaction field axis would be in a different position. Corvair generators turned CCW and if you compare to a CW gen you will see the different brush angles and axis difference.
 
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