How exactly does an armature spin in an electric motor?

[Tabaristiio]

In an electric motor, there exists two magnetic fields where usually one of them is a permanent magnet whilst the other is an electromagnet. However, how does the magnetic fields enable the armature to rotate / spin?

Also, how is the torque from the rotation of the armature transmitted to drive / operate certain components / systems?

 

[ElectricRay]

Ac motors work on a principle of attraction in magnetic field so North and South attract each other. DC motor work on repelling principle therefore there's a auxiliary field usually which is in series, parallel or both.

For the torque, the way i think about it is that more current is mpre torque. But there are good formulas for this but i don't known them by heart.

Hope this helps a bit

 

[cnh1995]

See if this helps.
https://www.physicsforums.com/posts/5144035/

https://redirect.viglink.com/?format=go&jsonp=vglnk_150297704931513&key=6afc78eea2339e9c047ab6748b0d37e7&libId=j6ghpn6t010009we000MAlmb22hv6&loc=https://www.physicsforums.com/threads/bldc-required-voltage-to-get-set-rpm-at-given-amps.907009/#post-5713519&v=1&out=https://books.google.com/books?id=jjuTYtKokc8C&pg=PA17&lpg=PA17&dq=tangential+force+on+an+electric++motor+rotor&source=bl&ots=RsXIXBCn3z&sig=pUK-g2iKCQ6ITeT6TskpwbyYzAU&hl=en&sa=X&ved=0ahUKEwiQ1Mu46czSAhVi4IMKHWiADQYQ6AEIMjAD#v=onepage&q=tangential%20force%20on%20an%20electric%20%20motor%20rotor&f=false&ref=https://www.physicsforums.com/members/cnh1995.552336/&title=BLDC: Required voltage to get set rpm at given amps | Physics Forums - The Fusion of Science and Community&txt=https://books.google.com/books?id=jjuTYtKokc8C&pg=PA17&lpg=PA17&dq=tangential+force+on+an+electric++motor+rotor&a...

Edit: @Tabaristiio, I copied my username by mistake below the thread linked above, so it is taking you to my profile. I've fixed it by linking the actual thread that I wanted to link in the first place. Sorry for the confusion.

 

[anorlunda]

These videos may help,

Also, how is the torque from the rotation of the armature transmitted to drive / operate certain components / systems?

That is not an electrical question. It applies to any rotating shaft. Do you understand how the rotating shaft in an auto engine makes the wheels turn?

 

[CWatters]

Also, how is the torque from the rotation of the armature transmitted to drive / operate certain components / systems?

Typically using gears & shafts, pulleys & belts, sprockets and chains and combinations of these.

 

[jim hardy]

OP might find this five year old thread helpful. Follow it to the end, though.

https://www.physicsforums.com/threads/is-counter-emf-a-good-thing.624785/