Not really.
Nowadays some EV motors still use a pair of slip rings, though many power transistors are used to switch current direction, so as to obtain a complicated multiple phase AC power supply to stator, not rotor.
Of course, two cases are exceptional: one is permanent magnet motor, another...
Yes, mine looks like Faraday disc, but I don't use the disc-itself as conductor, but use multiple turns copper wire coil pasted on surface of disc. So the disc should be an good soft magnetic steel which is almost non-conductor.
Generally speaking, if a material is a good electric conductor, it...
You really catch my idea.
But how do you think one turn need one pair of slip rings? If you are right, my idea will become junk.
I thick multiple turns can use one pair of slip rings.
They manufacture AC motors with slip rings, not DC motor.
Control circuit is complex to generate multi-phase power supply.
another link:
https://www.vedantu.com/question-answer/which-device-uses-slip-rings-a-a-dc-electric-class-12-physics-cbse-5feb209117b0716062784bca
All brushed DC motors only use commutators, which generate nasty sparks and EM interference.
If using slip ring in DC motor, then no spark no EM interference, everyone will be happy, but I cannot find a DC motor with slip ring in market.
I understand you.
Seeking answer for my question is not for my theoretical interest, but serve my engineering need, I'm trying to reinvent the "wheel" of DC motor with slip ring.
I hate to let the magnetic media move, but have to wind wire to a rotatable magnetic media.
Now I think the...
Commutators always generate unwanted sparks and bad EM interference.
If slip ring can replace commutator in DC motor, then electric vehicle industry will love it more than multi-phase AC induction motor.
From reply #13, then after, I assume the cylinder is replaced with an infinite area plate with thickness equal to original height of the solid cylinder, and no more rotation, but linear motion.
My only concern is whether the motion of wire (combined with plate), is affected by the plate in term...
Only the wire is in B field, and motion direction is vertical to B, the wire is a part of a loop, and other parts of loop is outside the B field.
So what's the result in this scenario of wire going with the magnetic plate?
BTW I will follow your advice in next topic, new thread for new subject...
If I paste a copper wire on top surface of the movable magnetic core, then the conductor wire will cut MMF lines during rotation.
My new question: is there the induced voltage between the two ends of wire?
Of course, I know there must be an induced voltage, if keep the movable section...
Instantly minimize their path length between magnetic domains?
Does it mean the so-called magnetic re-connection that often refers to solar surface magnetic phenomenon?
I remember textbooks state there are lots of magnetic domains inside magnetic materials, and MMF lines go through magnetic domains; so if the said section is rotating, then supposedly MMF lines should be twisted.
So I guess regular speed can render the twisting effect.
Though undrawn in the sketch, I can use a motor to drive the cylinder via belt, of course bearings are needed to keep stable.
Both the stator main section & the rotatable short section are made of same magnetic material, e.g. silicon steel etc.
Are you sure the MagnetoMotive Force (MMF) lines...