How exactly does an armature spin in an electric motor?

In summary, an electric motor works by using magnetic fields to create a rotational force that is then used to power various components. There are two main types of electric motors- DC and AC. DC motors work with a repelling principle, while AC motors work with an attraction principle. The torque generated by an electric motor is based on the current flowing through it. Hope this helps.
  • #1
Tabaristiio
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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?
 
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  • #2
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
 
  • #3
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.
 
Last edited:
  • #4
These videos may help,



Tabaristiio said:
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?
 
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  • #5
Tabaristiio said:
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.
 

1. How does an electric current make the armature spin?

When an electric current is passed through the coils of wire in the armature, it creates an electromagnetic field. This field interacts with the permanent magnets in the motor, causing the armature to spin.

2. What is the role of the commutator in the spinning of the armature?

The commutator is a mechanical switch that ensures the direction of the current through the armature coils is constantly changing, which allows the armature to continue spinning in the same direction.

3. What is the significance of the brushes in an electric motor?

The brushes are responsible for transferring the current from the power source to the commutator, which then passes it on to the armature. Without brushes, the current would not be able to flow through the motor and the armature would not spin.

4. How does the number of coils on the armature affect its spinning speed?

The more coils on the armature, the stronger the magnetic field and the faster the motor will spin. This is because more coils mean more interactions with the permanent magnets, resulting in a greater force and faster rotation.

5. Can the speed of the armature be controlled in an electric motor?

Yes, the speed of the armature can be controlled by adjusting the amount of current flowing through the motor. This can be done using a variable resistor or a pulse width modulation (PWM) controller.

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