The pull in winding is to ground and supplied from the Arm post. This keeps on keeping on for the duration. (other wise it would not pull in at the beginning) The arm voltage increases with RPM as the magnetism increases (due to the field windings tapping into the near open armature voltage, the field force almost is equal to full running current) the only thing "attached" to the arm is the pull in winding. Gotta Love it. Oldtyme Electrical compromise. Jim
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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