Took my trolley apart to put grease in the gear box. I broke one of the field wires by
accident and had to re-solder it to the contact plate. I have never paid attention as to how the trolley
reverses, but looking at the wiring I became puzzled. Are the two wires
around the field wrapped in different directions, right to left, left to right(or front to back and vice versa). And is this
how the current direction changes and causes the armature to reverse?
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Thanks for the picture Jim. The reason I am puzzled is that both field wires look the same when I see them wrapped around the plastic on the metal horseshoe. But they(the wires) must be wrapped differently on the plastic thingy in order for the direction to change when the slider moves. Am I correct in my thinking?
You are correct. The field windings are wound in opposite directions on the plastic core. This allows the magnetic field generated in the field windings to be reversed, thus reversing motor direction.
Larry
Thanks for all the info, guys. Now the wiring diagram makes sense - the arrow shows the direction of the windings. After all these years, I'm still amazed how electricity and coiled wire can make a motor:>
)
As far as I know, both wires are wound together in the same direction. But "Left" wire from one is joined with the "right" wire from the other, and attached to one of the brushes. The remaining wires go to the contact plate.
Perhaps it would be better to say "the beginning of one wire is joined to the end of the other wire, and soldered to one of the brushes".
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