Back EMF in DC Motor Formulas

The Back emf opposes the current which causes it in any dc machine. 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 Motor

fxBack EMF Equation of DC MotorGo

DC Motor formulas that make use of Back EMF

fxMotor Speed of DC MotorGo

List of variables in DC Motor formulas

fx Number of Poles Go

fx Magnetic Flux Go

fx Number of Conductors Go

fx Motor Speed Go

fx Number of Parallel Paths Go

FAQ

What is the Back EMF?

The Back emf opposes the current which causes it in any dc machine. 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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