Constant flux DC motor/generator.

[broli]

@lumen: You may be right about the flux being more dense towards the center. Below is a different design that uses the same flux density between two gaps.

The idea is that the left gap will cause a force on the conductor and a reaction force on the magnetic parts, while the right side will do the same. One can then deduce that the left side of the magnetic part will be affected by the left part of the conductor and the right side by the right side of the conductor. Using this knowledge one can make these parts to rotate freely on an axle to produce unrestricted rotation.

[leeanderthal]

I don't believe that any of the designs will have BEMF or back torque.  But, I believe that for much different reasons.  Since the conductor crosses the field twice, there is no net current produced.  It is cancelled out.

Lee

[broli]

I don't believe that any of the designs will have BEMF or back torque.  But, I believe that for much different reasons.  Since the conductor crosses the field twice, there is no net current produced.  It is cancelled out.

Lee

This is correct, the last posted design does not operate as a generator only as a motor, where the magnetic source rotates instead of the conductor. The previous designs could have been a generator IF the fields where equal, but as lumen pointed out this can not be necessarily the case...but the proportionality can always be tested with a 2$ hall sensor and a voltmeter.

[leeanderthal]

This is correct, the last posted design does not operate as a generator only as a motor, where the magnetic source rotates instead of the conductor. The previous designs could have been a generator IF the fields where equal, but as lumen pointed out this can not be necessarily the case...but the proportionality can always be tested with a 2$ hall sensor and a voltmeter.

I don't see how the last posted design can operate as a motor as the conductor again is crossing the field twice.
All of the designs have a couple of other problems as well.  Mechanically they would be impossible to build unless you could figure out how to levitate some of the components.  Electrically, way to much internal resistance (dead wire).

Lee

[broli]

I don't see how the last posted design can operate as a motor as the conductor again is crossing the field twice.

Yes and? Have you forgotten newtons third law. Action equals -Reaction. The conductor, which remains stationary, is acted upon by forces of the magnetic material. The magnetic material are acted upon by the reaction force of this. You perform some simple rules to get the forces and reason will tell you that the left part will mainly be affected by the left conductor side crossing the flux and the right part by the right conductor side. Hence the rotation of both sides albeit in opposite direction. If you don't get this logic then I can't help you.

Mechanically they would be impossible to build unless you could figure out how to levitate some of the components.  Electrically, way to much internal resistance (dead wire).

There is nothing to figure out except for experimental data, I annoted everything clearly. The parts you think that should be levitating in the first design are either stationary in motor mode or glued to the rest in generator mode. My designs are meant to inspire and explain the concept in a very general way, not present an autocad and CNC ready model.