Quote from: chalamadad on August 01, 2011, 05:50:14 PM

Not in his design. There are 8 rotor magnets. (but 9 coilpairs!) And the halls are perfectly opposite. Watch the video. There even is a hole near one of the driving coils, where the hall sensor was positioned earlier. From that position would have been alternating. But has been changed. I tested this in my configuration also and the synchronous firing gives me better speed.

@chalamadad
My apology on the 9 rotor magnets. I meant to type 8 and also what I wanted to state was that (at least in my build) at no point in the rotation of the rotor are the two hall sensors at TDC together; meaning they never fire together, it's one or the other. I have not looked at the videos at exactly top elevation but it would be difficult to affirm if the halls are 100% indeed 180 degrees apart from just looking at the videos.

cheers
chrisC

So i was just toying around with my incomplete rig (only three gen pairs complete so far) in bucking config, scope reads about 1.3 volts on gen coil 1(probably due to inconsistent coils) , when shorting the 
two points where top coil meets bottom coil on gen coil 1 and gen coil 2 the scope reads around 12v on coil 1. Actually I did use a diode across the short because a direct short loaded the coil too much. But with the diode it was minimal. Before the short I couldn't get any power for the load in bucking config.. While shorted the load would actually light dim.
I also tried shorting just the one leg of fwbr to center point between coils and that also increased the voltage on that coil but not to 12v, I think it was about 3v.

Something to think about.

Need a way to put all the gen coils in this shorting situation to see if power increases. Or maybe try to retune bias magnets while shorted.

It does do something funky to the waveform with the short. Try shorting two mid points and see the wave form. Back to the lab, just wanted to share.

The picture that was posted must be older, because Romero said that at first he had both halls mounted through using the rotor magnets to switch, but in fine tuning moved one to the outside magnets.
Also I am almost finished with a revamp of the test rig. The drive coil set stays in place, and bottom coil moves up and down, while the whole mount moves in/out of rotor. The gen coils move up/down as usual, but the top coils can also rotate advance/retard a full coil width. I will get some pics as it goes together and post.
Peace
rawbush

Quote from: Rawbush on August 01, 2011, 10:06:32 PM
The picture that was posted must be older, because Romero said that at first he had both halls mounted through using the rotor magnets to switch, but in fine tuning moved one to the outside magnets.

@rawbush: It is not older. It is grabbed right from the video. In fact one of the halls IS switched by the outside magnets here.
Really looking forward to more results of yours!

@chris: In this case it is not too difficult to ascertain the opposition of the halls. You can see the 9 coils and as you said, with unequal numbers for every coil there is a gap on the other side. Now imagine both halls rotating just a little CCW, so that the upper hall (on the picture) matches the coils position. Then the downside hall will be just in the middle of two coils.

@mondrasek: You posted an output graph that is showing a sinusoidal line. One theory is that due to core desaturation delay at certain frequencies will support acting against Lenz's law. You can compare this to the perception of a turning wheel; At different speeds it will look like the wheel is turning either CW or CCW depending on your eyes frequency. The same could apply if the speed can match the desaturation frequency.
Added: In a range where the speed doubles there should be 8 spikes to be seen because we have 8 rotor magnets. It turns out in your graph that this is possible!

@chalamadad

About the hall alignments, I show it on the image posted here.
http://www.overunityresearch.com/index.php?topic=862.msg14886#msg14886

wattsup