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Old 16th Nov 2018, 1:56 am   #7
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,902
Default Re: DC motor speed control

universal motors reverse if you reverse the connactions to either the brushes, or to the field (just not if you do both!)

4 wires from the motor to the controller would allow this.

David
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