The bearing motor

[tinman]

Ok, taking a short break.

Here is what I know about a homo polar motor as with a ring magnet and a copper disk close to it on the same axis.

1  If the disk is able to spin and the magnet is stationary, when we apply current to the disk from the outer edge to the center axle, the disk will rotate, and the direction is input polarity dependent. Likewise, if we physically turn the disk, currents will be produced in the disk between the outer edge of the disk and the center axle.

2  If the disk is stationary, and the ring magnet is able to spin, applying current to the disk from the outer edge to the center axle, the magnet will not rotate.  Nor will there be currents in the stationary copper disk if only the magnet is rotated.

3  But if the magnet is attached to the copper disk, so both rotate together, applying current to the copper disk from the outer edge to the center axle, the assembly will turn as one. Likewise, if we spin the whole assy, currents will be produced in the copper disk as previously described.

These things are to do with faradays experiments. I believe the bearing motor is a way different monster.

An experiment of seeming importance here....
So, on the standard homo polar assy using a ring mag and a copper disk, where both are able to rotate freely on the same axis, but independently, if we apply current to the copper disk from the outer edge to the center axle, the copper disk should rotate. But does the magnet rotate also?

That would be an impressive experiment. And it would help understand these things much better.


Mags

There is one thing you missed Mags that may help you understand what im trying to say about field clamping.
You dont need to spin the magnet or the rotor to produce current from a homopolar generator-the two can remain stationary. If you rotate the brushes them self, current is also produced.
In order for you to see that no current need pass through the magnet to make it spin, then  you need two magnets-one either side of a copper disk with minimal gap, and so as it is north one side of the copper disc and south on the other side. Make it like you have joined two magnets together and now have one big magnet. Then if current flows through the copper disc in from the side, and out through a hole in the center of one of the disc magnets, then the magnets will spin. Use ceramic magnets-that way you know current isnt flowing through the magnet it self, as they are non conductive.

[Magluvin]

There is one thing you missed Mags that may help you understand what im trying to say about field clamping.
You dont need to spin the magnet or the rotor to produce current from a homopolar generator-the two can remain stationary. If you rotate the brushes them self, current is also produced.

Can you show an example of that?   I would say that if there is current it is because the wires going to the brushes( moving the brush wires and brushes) are being induced by the field of the stationary magnet.

Mags

[minnie]

  Mags,
      good little demo Youtube.  Faraday unipolar generator pt.1.    Plenum  88.
                    John.

[Magluvin]

  Mags,
      good little demo Youtube.  Faraday unipolar generator pt.1.    Plenum  88.
                    John.

Thanks John

Well, if the currents, produced when only the stator brushes are moved, are produced by the stationary disk/mag, this would mean no drag when moving the stator brushes?  Or, it is the conductors of the brushes that are being induced by moving through the field of the stationary magnet and the disk is only making the connection between the brushes.

I have a feeling it is the stator brushes that are getting induced and the currents are not coming from the stationary disk.


Mags

[tinman]

Thanks John

Well, if the currents, produced when only the stator brushes are moved, are produced by the stationary disk/mag, this would mean no drag when moving the stator brushes?  Or, it is the conductors of the brushes that are being induced by moving through the field of the stationary magnet and the disk is only making the connection between the brushes.

I have a feeling it is the stator brushes that are getting induced and the currents are not coming from the stationary disk.


Mags

No current will be produced by moving the stator wires or brushes through the field,as both  the negative and positive side of the wires/brushes are moving together through the same field at the same time,and thus the net result would be zero.

I like this setup where he has counter rotating disc.

https://www.youtube.com/watch?v=aKr8ub5ZXls