Robotics & Control
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Motor Back-EMF

Voltage a spinning motor generates against its supply.

Formula

Vb=keωV_b = k_e \omega

Variables

V_bBack-EMF (V)
k_eEMF constant
ωAngular speed (rad/s)

Example

k_e=0.05, ω=200: V_b = 10 V

Did You Know?

Back-EMF rises with speed until it nearly cancels the supply — which sets a motor's no-load top speed.

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