Thane Heins Perepiteia.

[Charlie_V]

Its a shielding/unshielding technique.  The problem is that the force the magnets place on the spinning wheel is huge.  So the motor takes all the load even though the coil produces electricity - seemingly without back emf.  I don't think this technique would work with one wheel, you'd need two connected to the same shaft but 90 degrees out of phase so the forces balanced themselves along the axial. 

Unfortunately, lorentz law does affect these devices - you won't see that in the video because the motor is so grosely loaded by the magnets that the small back EMF of the coil is not noticeable.  Once the forces on the shaft are balanced, you will see the back emf slowing down the rotation.  This happens because the steel shield that is in the wheel magnetizes with the same polarity as the coil's iron core.  So as the shield moves downward to "block" the flux of the magnet, the iron core of the coil (which is also magnetized by the permanent magnet) is at the same magnetic polarity as the shield, and the shield and the core repel each other.  What makes it worse is that the coil will see the polarity of the permanent magnet decrease as the shield is moving down.  The coil counters this by increasing with the opposite polarity of the permanent magnet.  Unfortunately, the shield is at the same polarity as the core, so the repulsion between the core and the shield only increases as the back emf of the coil amplifies the polarity of the core.  I made a small drawing to better show what I'm talking about. 

This is the main reason why shielding techniques do not work.  I have long since abandoned this idea.   

ADD: It should be noted that the Black and White poles (N and S) on the core and shield, respectfully, are induced magnetic poles from the attraction forces of the permanent magnets (PM - shown in yellow).  The red poles are due to the back EMF of the coil and they add to the induced poles of the core - compounding the repulsion forces between the core and shield.

[CRANKYpants]

Its a shielding/unshielding technique.  The problem is that the force the magnets place on the spinning wheel is huge. 

YES AND THAT IS WHY OUR ROTOR WILL BE MADE OF DIAMAGNETIC BISMUTH OR EVEN LEAD OR CARBON GRAPHITE.

THE FORCE ON THE WHEEL IS ALSO A FUNCTION OF THE HYSTERSIS CURVE OF THE WHEEL MATERIAL WHICH HAS TO BE OVERCOME BY THE MOTOR.

IF THE ROTOR IS MADE OF SUPERPEMALOY OR SOMETHING SIMILAR THE COERCIVE FORCE REQUIRED TO CHANGE THE POLE DIRECTION (INSIDE THE ROTOR) WILL BE REDUCED.

TODAY I WILL BE MAKING MY ROTOR FROM LAMINATED TRANSFORMER CORE MATERIAL TO REDUCE MAGNETIC DRAG.

Magnetic Susceptibilities of Paramagnetic and Diamagnetic Materials at 20?C
http://hyperphysics.phy-astr.gsu.edu/Hbase/tables/magprop.html#c1

ALSO NOTE THAT I AM USING A WHEEL WITH A BAR - NOT JUST A BAR .

ONE MAN'S ABANDONMENT IS ANOTHER MAN'S GAIN.
WE WILL SEE WHAT WE SEE... 

CHEERS
Thane

[Charlie_V]

Diamagnetic bismuth or pyrolytic graphite is a very feeble effect.  You will not produce a large enough flux change to get anything from the coils.  Improving the shielding material will help but if you want to reduce drag, just counter balance the axial by placing another wheel on the opposite side and make it 90 degrees out of phase.  So the magnets on one side are trying to pull the wheel, while the magnets on the other side are trying to keep it center - you get a balancing force. 

Look at my drawings!  EVEN IF YOU BALANCE THE FORCES AND REDUCE MAGNETIC DRAG, YOU WILL HAVE BACK EMF ISSUES.  The shield will always magnetize with the same polarity as the core - adding graphite will not stop this (I tried).  The graphite is too weak an effect and even if it wasn't, it would setup a field on the inside to do the exact same thing - repel against the core.  Go ahead and try it - maybe you can find a trick to get around these issues.  But I've built a generator almost exactly like this (only it was a vertical design that kept the shield inside the magnetic field which reduced drag and made it so I didn't need a counter balance).  Think about how the fields will setup between the core and the shield. 

All your going to end up with is a crappier version of a standard electric generator.  I say crappier because the coupling between the permanent magnet and coil is much lower than in traditional generators.  The electrical energy produced from the coil will be much lower because of this.  Plus, the device still suffers from back EMF.  You'll find this out once you've reduce the magnetic drag enough.  I'm just trying to give you a heads up because I spent almost a year on this design before I began to see why it wouldn't work.  This is an old idea too, it appears all over the internet.  There is a reason why these generators aren't powering the world today.

[CRANKYpants]

All your going to end up with is a crappier version of a standard electric generator.  I say crappier because the coupling between the permanent magnet and coil is much lower than in traditional generators.  The electrical energy produced from the coil will be much lower because of this. Plus, the device still suffers from back EMF.  You'll find this out once you've reduce the magnetic drag enough.  I'm just trying to give you a heads up because I spent almost a year on this design before I began to see why it wouldn't work.  This is an old idea too, it appears all over the internet.  There is a reason why these generators aren't powering the world today.

DEAR CV,

THANKS FOR THE HEADS UP - BUT IF YOU HAVE BEEN FOLLOWING THIS THREAD AT ALL YOU MAY HAVE NOTICED THAT GENERALLY I DON'T LISTEN TO ANYONE ESPECIALLY I_RON ( I PREFER TO LEARN THE HARD WAY).

THE "TRICK" IS TO GIVE THE COIL'S BACK EMF INDUCED FLUX AN ALTERNATE ROUTE - I.E. THROUGH THE RING.

I HAVE BEEN DOING TESTS ALL DAY WITH A MAGNETICALLY BALANCED LOW DRAG ROTOR AT 10 TO 3500 RPM AND A COIL PRODUCING 50 V WITH AN INDUCTION MOTOR AND MONITORING THE MOTOR CURRENT DOWN TO 100 mA - AND FROM NO LOAD DOWN TO A DEAD SHORT THERE IS NOT EVEN 1/100th OF AN AMP INCREASE IN MOTOR CURRENT.

I HAVE BEEN WORKING WITH (DIVERTING AND FAILING TO DIVERT) BACK EMF FOR 10 YEARS NOW SO I KNOW WHAT TO LOOK FOR - THERE IS NONE.

MY "CRAPPIER" VERSION HAS AN AIR GAP OF 1/4 INCH WITH A 1/8 INCH ROTOR AND ZERO BACK EMF EFFECTS.

THE REASON WHY THESE GENERATORS AREN'T POWERING THE WORLD TODAY IS BECAUSE PEOPLE GIVE UP TOO SOON, WE MUST BE PREPARED TO FAIL 10,000 TIMES AT THE VERY LEAST BEFORE SUCCESS SHINES ON US. 

EVERYTHING OLD IS NEW AGAIN.

THANKS FOR TELLING ME IT CAN'T BE DONE - NOW I'M REALLY MOTIVATED! 

CHEERS
Thane

[i_ron]

snip

THANKS FOR TELLING ME IT CAN'T BE DONE - NOW I'M REALLY MOTIVATED! 

CHEERS
Thane

Thane Meister,

Oh mon, you fooled me on that one... I was babbling away not realizing you intended the magnets
AND the coils to be stationary! But like CV says, it is not going to work, hehehe.

My bud Al Francoeur has one that works though.

Your conscience