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Old 06-17-2015, 05:15 AM
bistander bistander is online now
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continued from previous post

In circuits in general, when you want to transfer power from one device to another, their potentials must oppose. For instance if you want to charge a battery, the battery voltage must oppose the source voltage (charger). That way the power from the source is delivered to the battery, minus the resistive losses in the circuit and internal in the battery.

Regarding my last sentence "Without BEMF, a motor would not rotate due to an electric input." It is kind of a chicken and egg sort of thing. If the motor rotates, it generates a voltage in the armature. If there is no voltage generated (Eg or BEMF) in the armature, there is no rotation. If there is no rotation, there is no BEMF. I am making the assumption you're not turning the shaft by other means or changing the flux.

Hope that explains it.

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