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Joe K · 11-03-2013, 11:31 PM

That's the pix I referenced above.

One brush is grounded. The other brush comes out of the top of the case and is (-) (positive ground system.)

Meanwhile the third brush feeds the field coils which are set up in series. The only trick to the field coils is that they have to be wound the same way, otherwise magnetically one will cancel the other out. And the other end of the wire after the second field coil is grounded as well.

A compass can help you find out if the polarity of the field cancels out. If one or the other poles of the field attract the SAME end of the needle on a compass, then they're bucking each other.

Joe K

11-03-2013, 11:31 PM	#10
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: 1930 field coil wiring That's the pix I referenced above. One brush is grounded. The other brush comes out of the top of the case and is (-) (positive ground system.) Meanwhile the third brush feeds the field coils which are set up in series. The only trick to the field coils is that they have to be wound the same way, otherwise magnetically one will cancel the other out. And the other end of the wire after the second field coil is grounded as well. A compass can help you find out if the polarity of the field cancels out. If one or the other poles of the field attract the SAME end of the needle on a compass, then they're bucking each other. Joe K __________________ Shudda kept the horse.