The bearing motor

[tinman]

It can spin in either direction since the polarity of the magnetic field reverses with a change in the current direction (there's no net change, so the force is in the same direction).  This is a universal motor where it runs on both AC and DC.


Gravock

This is a universal motor where it runs on both AC and DC.

Please provide a link to a universal motor that will run in either direction on a DC current without switching the polarity of current flow.

[Magluvin]

Guy's
No current need flow through the magnet in order for the magnet to spin. The opposite effect to this can be seen in the homopolar generator.

I would need to see that to believe it.   If you take 2 disk mags and have them face each other say 1in apart, and the magnets are set up do they can spin on axis, if you spin one, the other wont spin. There is zero force on the other magnet to spin with the other.

Likewise, we cant get the disk magnet to spin using dc through a wire, no matter the position or orientation of that current carrying wire. The field from the wire will only affect the magnet as a whole, not as if the field lines are teeth of a gear and torques the magnet into rotation.

The key idea of having the ring magnet mounted to the copper disk in a homo polar dynamo is the fact that the magnet rotates with the disk yet the disk still produces current. But if we mount a magnet to the end of a coil and move the magnet and coil through space, what ever direction, we get no current in the coil. So the solid ring magnet mounted to the copper disk and when they rotate together, current is produced in the disk, is a very very special case in point.   

The very foundation of that destroys the idea that there are no field lines along with the idea of change in field strength on a conductor is needed to produce mutually inducted currents in the conductor.

But this is pretty much the only special case for that argument. At least that I know of.

What attracts me to the idea of having the ring magnet attached to the rotating copper disk is the possibility of no drag when currents are sent to a load..  Typical gens need increase in input as the load increases. But here with the magnet spinning with the disk, if we draw current from the disk, is there a need for more input torque to overcome drag/lenz? And if so, with the mag spinning with the disk, what is causing the drag if the 2 components are mounted and spinning as one?

So say if there is no drag. Is that the secret to a true lenzless gen? And if there is drag, what are we dragging against? The field itself, as these fields are all around us?  If so, then that is possibly the holy grail of solid state motion devices. If we can drag against it, then we should be able to produce motion with it by pushing and/or pulling against it, like a silent ufo, car, plane, etc.

Mags

[Magluvin]

I would need to see that to believe it.   If you take 2 disk mags and have them face each other say 1in apart, and the magnets are set up do they can spin on axis, if you spin one, the other wont spin. There is zero force on the other magnet to spin with the other.

And what I mean by that is, sure, if we mount the magnet to the disk, the magnet will spin with it without current flowing through the mag, but its the disk with current flowing through the radius that physically carries the magnet into motion. The magnets mass is just additional baggage, extra weight. Faradays experiments show that if we apply current through a stationary disk that the magnet will not rotate, even though its fields are being altered by the fields of the current carrying disk.  So if the magnet were not mounted on an axle and were free to move like on a gimbal, then the magnet would physically move, but not in a continuous rotating fashion.

Now, if we simulated a ring magnet with a bunch of little magnets mounted to a say plastic disk, then mounted that to a copper disk and spin the whole assy, there wont be current in the disk. There is a big difference between a solid ring mag and one that is made up of say 10 1in dia disk mags mounted in a circle. When the ring mag is solid, the fields are not dragged around when the ring spins on axis, but the ring mag made of a bunch of individual mags does.

Mags

Mags

[gravityblock]

Please provide a link to a universal motor that will run in either direction on a DC current without switching the polarity of current flow.

Reversing the current in a homopolar configuration will reverse the polarity of the induced magnetic field (the force changes direction).  Do you disagree?  Reversing the polarity of the externally applied magnetic field (PM) in a homopolar configuration will reverse the rotation direction (the force changes direction).  Do you disagree with this?  As we can see, in the bearing motor, reversing the current will reverse the direction of the force.  However, reversing the current also reverses the polarity of the induced magnetic field, which this reversal in the polarity of the magnetic field will once again reverse the direction of the Lorenz force......which results in no net change in the direction of the Lorenz force.

You asked for a reference link to a universal motor that will run in either direction on a DC current without switching the polarity of current flow.  Reference link:  Electromagnetic Induction and the Conservation of Momentum in the Spiral Paradox

Gravock

[tinman]

Gravock

Reversing the current in a homopolar configuration will reverse the polarity of the induced magnetic field (the force changes direction).  Do you disagree?

No ,i do not disagree

  Reversing the polarity of the externally applied magnetic field (PM) in a homopolar configuration will reverse the rotation direction (the force changes direction).  Do you disagree with this?

The force produced by the current carrying wire remains in the same direction. You have done nothing more than turn the motor upsidedown.

As we can see, in the bearing motor, reversing the current will reverse the direction of the force.

No ,it dose not.

However, reversing the current also reverses the polarity of the induced magnetic field, which this reversal in the polarity of the magnetic field will once again reverse the direction of the Lorenz force......which results in no net change in the direction of the Lorenz force.

No,regardless of which way the current is flowing,the rotation direction is set by the initial spin direction-->it is not determined by the direction of current flow. The right hand rule dose not apply here.

When you reverse the rotation direction in the bearing motor, you also reverse both the direction of the induced current and the induced magnetic field.

You do no such thing. Current flow remains in the same direction.

 

If you disagree with this, then you need to explain why this motor doesn't operate as a generator.

Because the lorentz force is not applicable in this motor in its current understanding.

As we can clearly see in the homopolar motors, reversing both the current direction and the polarity of the externally applied magnetic field (PM) simultaneously results in no net change in the direction of the Lorenz force.

Yes,but in the bearing motor we do not have to reverse anything in order for it to spin in the opposite direction.
The direction of rotation is the direction of initial spin before current is applied.