Back EMF in DC Machines Formulas

Back EMF is developed when current flows through the armature, it generates a magnetic field that interacts with the field produced by the field winding to produce a torque. And is denoted by E_b. Back EMF is usually measured using the Volt for Electric Potential. Note that the value of Back EMF is always negative.

Formulas to find Back EMF in DC Machines

fxBack EMF of DC GeneratorGo

List of variables in DC Machines formulas

fx Output Voltage Go

fx Armature Current Go

fx Armature Resistance Go

FAQ

What is the Back EMF?

Back EMF is developed when current flows through the armature, it generates a magnetic field that interacts with the field produced by the field winding to produce a torque. Back EMF is usually measured using the Volt for Electric Potential. Note that the value of Back EMF is always negative.

Can the Back EMF be negative?

Yes, the Back EMF, measured in Electric Potential can be negative.

What unit is used to measure Back EMF?

Back EMF is usually measured using the Volt[V] for Electric Potential. Millivolt[V], Microvolt[V], Nanovolt[V] are the few other units in which Back EMF can be measured.

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