Definition of 'back emf'
back EMF in Electrical Engineering
(bæk i ɛm ɛf) or back electromotive forcenoun
(Electrical engineering: Electrical power, Motor or generator)
Back EMF is the system in the coil of an electric motor that opposes the current flowing through the coil, when the armature rotates.
When the speed varies, the winding characteristics may fluctuate, resulting in variation
of back EMF.
At high speeds the traction motor armatures are rotating rapidly and have a high
back EMF.
Back EMF is the system in the coil of an electric motor that opposes the current flowing through
the coil, when the armature rotates.
Collins English Dictionary. Copyright © HarperCollins Publishers
Nearby words of 'back emf'
Source
Definition of back emf from the
Collins English Dictionary
Collins Dictionaries for Schools
Our new online dictionaries for schools provide a safe and appropriate environment for children. And best of all it's ad free, so sign up now and start using at home or in the classroom.
Read more
Unlock language with the Paul Noble method
No books. No rote memorization. No chance of failure. Your chance to have a one-to-one lesson with best-selling language expert Paul Noble, try a FREE audio sample of his brand new Mandarin Chinese course.
Read more
13th edition of the Collins Dictionary out now!
Updated with all the very latest new words and senses, this new 13th edition is an unparalleled resource for word lovers, word gamers, and word geeks everywhere.
#homeoflivingenglish
Read more
Word lists
We have almost 200 lists of words from topics as varied as types of butterflies, jackets, currencies, vegetables and knots!
Amaze your friends with your new-found knowledge!
Read more
Rainbow Tree, Asymmetric Wreath, and Period Poverty: November’s Words in the News
Catch up on the latest words in the news this November with Robert Groves.
Read more
Join the Collins community
All the latest wordy news, linguistic insights, offers and competitions every month.
Read more