I am rebuilding a 601-101 diesel Pullmor motor, which uses a 600-125 armature – pretty common but reliable stuff from the 1950’s. As I am rebuilding, I noticed that the field windings appear to be made of finer wire than what I am used to seeing.
Subject motor is "B" on left, "A" is one of 2 known good motors.
A quick check with a micrometer revealed the (magnet) wire used on this field is between 33 and 34 gauge as opposed to the 23 gauge wire which Robert Hannon lists for this motor. Also, my ohm-eater registers 3.0 ohms for this field winding as opposed to 0.9 to 1.0 ohms that Mr. Hannon specified for this motor. And just for comparison, I have two more identical but well-working Pullmors (motor "A" on right) that both measure 0.6 ohms on their field windings. It seems this field may have been rewound by another Pullmor lover.
In short, my question is what effect will this have on an otherwise fully restored motor?
For those of you who have torn one of these motors down to ALL of their individual pieces, including all the pieces of the aluminum frame, you know there’s a lot of careful work that goes into putting it all back together, and I really don’t want to waste my time recrimping the top plate to this motor if the final product will be deficient in some way. My suspicion is that it will be weaker than normal, so I need someone with some solid motor knowledge to help me understand if this thinner wire will actually work OK, or if I should be looking for a scrap motor somewhere as a donor for a proper field winding.
Thanks for your input
George
However, less current because higher impedance still means lower motor speed at any given voltage.
