Homopolar Stack (multiple generators on one common shaft) Brent Hasty

[teknomage2012]

The patent pending is a note on this lab drawing similar to the January 1st 2005 note of when I sketched it. Since development progress has been slow over the last 5+ years, I posted the lab drawings here to GPL Open Source them and encourage further development beyond the lab to manufacturing and marketing.

How is it a halbach array would allow you to go brush-less?

Without contact, how do your propose inducting DC potential off the rotor?

Brent,

I noticed on your drawing it says patent pending.  I have released many drawings on this forum, using N/N or S/S configurations to increase the voltage and to extract the current from both sides of the axis.  This is nothing new.  In fact, I have hammered this idea on this forum over the last few years.  You could even go brushless by using multiple halbach arrays with this concept.  I don't know why I'm telling you this, for you will probably try to patent the brushless concept also. 

GB

[altair]

Thanks Brent.
As the basic N-machine is a low-voltage/hi-current device, how successful has been your stacked arrangement, to increase the voltage ?
Is the voltage increase proportional to the number of magnets ? (or pairs).
The balancing issues must be the greatest problem to overcome in this type of machine. A dynamic balancer would be a mandatory piece of equipment to have...
The supporting shaft must be non-conductive, but at the same time as ridgid as possible. What material have you been using ?  Would it be possible to use a large steel tube for support, surrounded by another insulated tube ?

Have you tested it with un-evacuated chamber, with just air inside ? I suppose that the drag was quite high.  But at higher speeds, the centrifugal force would probably "evacuate" the inner spaces between the plates and magnets, which would slightly pressurize the peripheral area. Then you could let the casing open to athmospheric pressure and the inside pressure would equalize with the outside. For cooling, a restricted passage in the shaft would let air in. Air might be more effective for cooling than argon, but I don't really know. Of course, for the spark gap, it's not ideal.

How much power have you been able to extract to date with this 4" generator?
Sorry for all those questions 

Altair

[Hypercom]

Hi

Altair ok, here it is ...

http://arxiv.org/ftp/physics/papers/0012/0012009.pdf

Hypercom

[gravityblock]

How is it a halbach array would allow you to go brush-less?

Without contact, how do your propose inducting DC potential off the rotor?

How is it a halbach array would allow you to go brush-less?  In the same way the halbach arrays allow you to go brushless in regular induction motors.

Without contact, how do your propose inducting DC potential off the rotor?  By using what I call "virtual relative motion" between the discs.  In this setup there will be two discs and a closing circuit.  One disc will be induced with a negative polarity while the other disc will be induced with a positive polarity.  Basically, the two halbach arrays will be enshrouded in copper, and will rotate inside this copper shell.

I do realize you will say there must be relative motion between the disc and external circuit, but I will argue the relative motion only allows the disc and external circuit to have equal and opposite EMF that does not cancel each other out.  For instance, in this configuration disc/N/S/disc, the left disc will have the same polarity has the right disc if everything is rotating together, thus there is no potential difference in this setup.  In a configuration like, disc/S/S/disc, then the left disc will have an opposite polarity as the right disc, and there is a potential difference between them.

I also realize you will say, rotating the magnet does not induce an EMF when the disc and external circuit are stationary.  This is true, but remember we are dealing with two halbach arrays.  Rotating a PM on it's magnetic axis above a stationary PM, will not cause the stationary magnet to rotate, but rotating a halbach array above another stationary array will cause it to rotate.  I hope you see the difference with this.

I also realize you will say, the magnetic field of a halbach array is not uniform like a PM rotating on it's magnetic axis.  I will argue a halbach array can be built to have a uniform field.

GB

[lumen]

@Hypercom

Interesting reading, seems to explain the HPG very well. I need to read it again and try to understand more on the concept of the spiral, and the exact effect it generates and why the author thought it was important.