Latest: No back torque generator.

[Groundloop]

BWS,

Thanks for taking time to answer me. Making brushes for each disk is too complicated. Having separate discs with a lot of distance is not practical. Back to the thinking box...

Thanks,
Groundloop.

[BWS]

@gravityblock,

The function for voltage in homopolar/unipolar generators is:

V=rpm x B x ([outer brush radius squared] - [inner brush radius squared]) x c
where c is some constant that accounts for the units used.

Note that the voltage is linear with respect to field strength and to rpm, but that it is a function of the square of the radius.  This is because as the radius increases, so does the linear velocity through the field;  i.e. there is more conductor traveling past a fixed point in space (the field is fixed in space) farther out the radius in any given unit of time.  So a larger diameter will best improve voltage in any solid rotor.
-BWS

[Yucca]

@All

I now realise either polarity is possible with HPG, and have tested to satisfy myself. I was thinking before (stupidly) that if field polarity affected current polarity then the N side of a mag disc would cancel out the S side. Of course now I realise each side is rotating oppositely, one CW, one CCW when viewing the shaft ends. This has already been written in this thread but I misread/misunderstood when I first read it.

@groundloop,

sorry for my delayed reply, I was sidetracked this morning.
Yes, you can put several disks in series, but there are conditions...  First, the fields most be arranged to keep them strong (aligning N/S/N/S is preferred).  Second, each conductive disk must have it's own brush set (a central brush and a circumferential brush) a possible exception to this is the design Bruce DePalma used where he had 2 discs mounted on one shaft; each disk had magnets on either side, these assemblies had opposite magnetic polarities (N/S, S/N with a good bit of space between them) the discs were connected electrically through the shaft so then to get the current off the circumferences he poured mercury into a circumferential gap that allowed power out from the 2 mercury brushes.  Bruce never achieved OU, which leads back to the problem of current saturation.  He could not get OU because he could not adequately load the machine with current to realize this.  This was the big advantage Adam Trombly had over Bruce Depalma; Adam knew the rotor had to be uniformly filled with current to see OU.  He drew 15,000A from a 6" rotor and then saw OU.  Bruce's device would have had to push 40K or 50K amps for this, and he could not get there.
-BWS

So to get easier current saturation in a homebuilt experimetnal device it might be better to use very thin copper foil discs rather than copper sheet discs?

[BEP]

What about replacing the magnet with a coil that has an alternating turn direction? You eliminate some brushes and have a series disk effect. For testing only of course.

[BWS]

So to get easier current saturation in a homebuilt experimetnal device it might be better to use very thin copper foil discs rather than copper sheet discs?

You might be on to something there, if a good solution to multiple brush sets could be found.