Thane Heins Perepiteia.

[CRANKYpants]

Great Thane, can you make a video with a scope connected to a coil (or both to show phase diff.) to show how it behaves when rpm changes?

SURE BUT THE PHASE SHIFT IS GOING TO BE A REFLECTION OF THE LOAD - SO IF I USE A PURELY RESISTIVE LOAD THE PHASE SHIFT WILL BE "1" OR IN PHASE - NOW WE SHOULD EXPECT BOTH THE CURRENT AND VOLTAGE SINE WAVE AMPLITUDES AND FREQUENCY TO INCREASE.

OFF LOAD THE PHASE SHIFT SHOULD "IDEALLY" BE "0" OR 90 DEGREES OUT OF PHASE BUT IN REAL LIFE SHIFTED SLIGHTLY TOAWRDS "1" DUE TO THE COIL'S DC RESISTANCE.

Thane

[CRANKYpants]

The way I drew it is correct.  As the shield moves over the north pole, the coil sees a DECREASING north pole.  This is the same as the lower left image of your Lenz drawing.  It is the same as pulling the north pole magnet away, the coil is going to set up the flux so that the core polarity facing the north pole  is south - just as I drew it.  Unfortunately, the shielding is also south, which causes a repulsion. 

OK NOW I UNDERSTAND.

The design I showed worked fine, but it was not back EMF free.

WHAT IF YOU PUT A RING AROUND YOUR SHIELD AS I HAVE DONE - CAN YOU SEE HOW THIS MAY WORK DIFFERENTLY?

Thane

[CRANKYpants]

HOPEFULLY BY TOMORROW I WILL HAVE MY NEW EFFORT INSTALLED IN MY 5500 TURNS/SIDE TOROID.

Thane

[Charlie_V]

WHAT IF YOU PUT A RING AROUND YOUR SHIELD AS I HAVE DONE - CAN YOU SEE HOW THIS MAY WORK DIFFERENTLY?

My design has a ring around it - two actually.  The top and bottom of the shield is a ring (as you can see in the 3D image).  So what I drew you was actually a solution to the core and shield repulsion problem.  Unfortunately, the flux change was only about 10 Gauss - which was too feeble.  By that point I was so tired of fooling with a device that yielded such crappy flux change that I abandoned it for a different mechanism.   I warp the fields of the magnets now instead of diverging them.  This gives much better flux change and reduces the size of the device. 

I retract what I said earlier.  You might have something with your design - I finally see what you are talking about.  I like your design better because the magnets' poles are facing the core.  But you need to have 2 wheels.  Make the exact same setup but on the other side of the motor, and put the shields 90 degrees from the other wheel.  This way you will have a perfectly balanced axial and you can use a much smaller motor to spin the wheel.  Also, the ring area appears small compared to the core area - in the video atleast.  Shouldn't they be the same?

If you have the coil producing 50V's then balance that axial and close the loop!  Make sure the wire you are using can support ~300mA.  A good tape cosset motor is 6V at 300mA no load.  If your axial is balanced then this little motor should be able to spin the wheels just fine - it might need help getting started of course.  But they go up to like 2000 RPMs easy. 

Later,
Charlie

[CRANKYpants]

I retract what I said earlier.  You might have something with your design - I finally see what you are talking about.  I like your design better because the magnets' poles are facing the core.  But you need to have 2 wheels.  Make the exact same setup but on the other side of the motor, and put the shields 90 degrees from the other wheel.  This way you will have a perfectly balanced axial and you can use a much smaller motor to spin the wheel.  Also, the ring area appears small compared to the core area - in the video atleast.  Shouldn't they be the same?

If you have the coil producing 50V's then balance that axial and close the loop!  Make sure the wire you are using can support ~300mA.  A good tape cosset motor is 6V at 300mA no load.  If your axial is balanced then this little motor should be able to spin the wheels just fine - it might need help getting started of course.  But they go up to like 2000 RPMs easy. 

Later,
Charlie

BASED ON YOUR SUGGESTIONS - I BOUGHT ANOTHER WHEEL YESTERDAY BUT DIDN'T INSTALL IT YET - BUT WHAT I DID DO IS CONTINUE MY MAGNETS INTO A RING SO THE ROTOR SHIELD HAS LESS COGGING TORGUE (A RING OF MAGNETS INSTEAD OF JUST A PAIR) - NOW I CAN SPIN IT WITH 1 FINGER - SO NOW WITH 2 WHEELS IT OUGHT TO BE EVEN BETTER.

AS FAR AS THE RING  SIZE I NEVER ARGUE WITH WHAT WORKS.

CHEERS
Thane