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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q536 - Electrical, Electronic, & Control Engineering
123. From the instant of start-up, through the acceleration period, and until the motor reaches rated speed, when is the counter EMF produced in the windings of a DC motor «zero»?
Counter EMF in a DC motor is zero only when the armature is stationary; any rotation, however slight, induces a voltage that opposes the applied voltage.
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