Re: Owen Dyneto generator wiring

Posted by Sherlock On 2017/11/24 20:41:13

[by HH56 on 2017/11/24 17:53:36

The Franklin generator must add another wrinkle to the series/parallel winding. Looking at the schematic, the parallel shunt winding is plain. Out the top right brush thru the field coils and to ground at the ground connection. I would really like to see a more generator specific writeup and better quality schematic of the generator to see if that is a solid ground connection at the third brush or is it a bleed over from the fuzzy print. If it is a solid ground connection then I am not understanding the circuit and how they get the series portion of the field connected as part of the output.

The grounded third bush seems incompatible with it being a series winding because if it is grounded it would not seem to be a series arrangement anymore. It would appear to me it is a second but heavy parallel winding because the series aspect would be short circuited at the grounded brush and not be in series with the output.

If there is no grounded third brush then it would definitely be a series -- out the bottom right, thru the fields, back in the third brush and thru an armature winding and out. With the brush grounded I can't see any output other than that developed between the grounded brush and a few armature windings to the top right output brush.

If anyone has the knowledge or an old auto electric manual that explains this particular generator I could sure use some enlightenment.]

Howard, I see your point. The "heavy" series windings wouldn't connect with the load if there is a grounded third brush. Maybe the wiring diagram omitted the little "hump" that would indicate no connection between the third brush to heavy shunt field lead and the light shunt field to ground lead. If the third brush and heavy field leads were simply connected to each other and not grounded, the series circuit would operate as you describe.

The "light" shunt field could well be grounded at another spot on the generator body. My resistance tests between brushes and the generator case, with the two leads in question disconnected, suggest there is another wire grounded somewhere else to the case. That would comport with your analysis.