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Module 3. Electrical fundamentals

Back-EMF is the greatest when a motor is

at operating speed.
under heavy load.
just starting to rotate.

Explanation

Back-EMF is proportional to speed, so it is greatest when the motor runs fastest, at normal operating speed. At start there is no back-EMF (hence high inrush current), and under heavy load the motor slows, reducing the back-EMF.

pidimateos asking:

please can someone explain it to me in a few words?

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