DC Motors - Armature and Field interaction?

[palo]

Decided not to use the template as I'm not asking someone to do my homework for me, please don't delete!

Anyway, doing my A2 coursework on the workings of a DC motor. I found that when the armature and field electromagnets are connected to separate power supplies that, when it appears they should act independently, they have a major effect on each other in terms of current and potential difference.

Pretty simply question, why? It's pretty hard Googling for an answer to this, my teacher say it's 1st - 2nd year university level but there is only so much I can do without knowing.

Thanks

 

[Jhero]

for your question! It's great to see that you are taking an interest in the workings of a DC motor for your coursework.

To answer your question, the reason why the armature and field electromagnets have a major effect on each other is due to a phenomenon called mutual induction. This occurs when a changing magnetic field in one coil of wire induces an electromotive force (EMF) in another nearby coil of wire. In the case of a DC motor, the armature and field electromagnets are essentially two separate coils of wire that are placed close to each other.

When a current is passed through the armature coil, it creates a magnetic field that interacts with the magnetic field created by the field coil. This interaction between the two magnetic fields causes changes in the magnetic flux, which in turn induces an EMF in the field coil. This EMF then affects the current and potential difference in the field coil, as you observed.

This mutual induction allows the armature and field coils to work together in a DC motor, with the field coil providing the necessary magnetic field for the armature to rotate. Without this interaction, the motor would not function properly.

I hope this helps to answer your question! If you have any further inquiries, don't hesitate to ask. Good luck with your coursework!