Series field nomenclature
Series field nomenclature
(OP)
Hi all,
I am connecting a compound DC motor and have run into series field markings that are new to me. Armature is marked A and AA, Shunt field is marked F1 and F2 and Series field is marked X and XX. I want to connect cumulative and I believe that my jumper connection should be AA to X or A to X depending on rotation. Anybody run into this style of marking? The motor was made in Birmingham, England about 30 years ago and is on a Bronx bar straightener. Thanks in advance.
I am connecting a compound DC motor and have run into series field markings that are new to me. Armature is marked A and AA, Shunt field is marked F1 and F2 and Series field is marked X and XX. I want to connect cumulative and I believe that my jumper connection should be AA to X or A to X depending on rotation. Anybody run into this style of marking? The motor was made in Birmingham, England about 30 years ago and is on a Bronx bar straightener. Thanks in advance.





RE: Series field nomenclature
It is very probable (almost sure about it) that a similar method is used on your motor. I would connect like this:
PLUS->X, XX->A, AA->MINUS. PLUS->F1, MINUS->F2. That would make the motor speed load dependent so that load between upper and lower roll can be adjusted and stays stable.
The main thing is that series field and armature have the same polarity. So, if you want to run CCW, you connect XX->AA, A->MINUS. Leave all other connections.
It is possible that the peckerhead is laid out so it is easier to put series winding after armature. Keeping armature polarity and series winding polarity the same is the important thing.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Series field nomenclature
You said
Keeping armature polarity and series winding polarity the same is the important thing.
But You meant
Keeping shunt winding polarity and series winding polarity the same is the important thing.
Right ?
RE: Series field nomenclature
The peckerhead is laid out for jumper connections and it will be easy to connect. Edison, for the load dependant speed regulation Skugsgurra is right. The armature and series field must maintain polarity. I see I flip flopped them in the original question. I'll try your connection suggestion and see how it performs under load. If the speed increases under load then I know that the armature and series field are opposite polarity. Thanks again.
Jim.
RE: Series field nomenclature
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Series field nomenclature
By braking, if you mean plugging, yes, you always reverse the armature supply and never the shunt field supply in a compound motor. The series field (which is different from interpoles) should always have the same shunt field polarity. The series field is wound in the same pole brick that contains the shunt field.