As shown in figure "B" of the illustration, when the DC motor in figure "A" is operating at minimum speed what are the armature and field characteristics? Illustration EL-0153

Correct Answer: Option B — The motor is operating at minimum armature voltage and maximum field current.

Minimum speed on a DC motor is achieved by applying minimum armature voltage to reduce counter-EMF while supplying maximum field current to produce the strongest magnetic flux per IEEE 45 guidelines.