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About NEMA control signal lead (letter "C") for DC motor

About NEMA control signal lead (letter "C") for DC motor

About NEMA control signal lead (letter "C") for DC motor

(OP)
I'm quite new to DC motor application and wanna learn a lot.
Anybody could tell me how does the control signal lead (NEMA letter "C", between Intercoil and armature) work? To what it connect? Why call it control signal?

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