STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[PaulLowrance]

The patent for their measuring device says the method for claim 1 is a partially demagnetized neodymium magnet under test.  WTF?

He he, sounds like my el grande chepo NdFeB magnets in my "tiny orbo replication" that most people would throw away, lol.

[gotoluc]

Hi all,

here is a new video that better demonstrate the differences between a single coil toroid over a dual split coil toroid since I did not show the difference between the two in the last video.

I did build a new rotor to accommodate 2 magnets but before adding the second set of magnets I decided to do this video (single magnets) so we have a measuring difference using the same rotor since the rotor characteristics have now changed.

I didn't have enough time at the end of the video to do an Inductance test of the coil once in the preferable configuration, so here are the numbers:

880mH @ TDC (coil on position)
1,050mH @ (coil off position)
6.75 Ohm DC Resistance

Also single coil resistance is 3.35 Ohms

I will be away for the next 2 days, so the dual magnet test will have to wait till maybe Sunday.

I don't understand this effect, so if anyone has an idea of what's going on please share.

Link to video: http://www.youtube.com/watch?v=bOojYp07C7M

Luc

[gravityblock]

Anyone find these two drawings interesting on the magnitude of the flux versus angular displacement of the disc at 10,000 RPM in figure 15, and the torque and flux versus the angular position of the disc at 10,000 RPM in figure 14?  PL, I know you're new circuit is for RPM's greater than 10000, what are your thoughts on the graphs?  The graphs were found in the patent.

GB

[gotoluc]

Hi all,

a last quick update!

I added the top row of South pole magnets to the rotor and basically the current is half of what it was. I also had to back out the core about 2mm as it was getting noisy.

The current is now around 8.6ma @ 1.58vdc with the coils connected in the preferred dual mode. RPM is 195 from 210 with single magnets and flyback at 1K load is 1.19vdc from 1.43vdc with single magnets.

Inductance @TDC is 793mH and 1,053mH at off position.

That's all for a few days.

Luc

[gravityblock]

Wow, with all this stuff going on, it may be easier to just get a group of about 20 peeps and go together and spring for the SKDB.
Then build something that works!

I have a good idea what is in the SKDB.  It's going to teach you how to build and use the patented measuring device to perform tests on the materials so you will know the optimal parameters and are able to match the materials in a successful replication. 

There are slight variations within the same type of materials.  For example, one metglas core may perform better with a pulse width of 21⁰ and another metglas core of the same type may perform better at 23⁰.  You would then need to match all four cores which require the same pulse width in order to have the best performance.  Also, one core may saturate at 0.62T and another core of the same material may saturate at 0.64T.  You would need to match the cores that have the same saturation point.

Another example, one core may perform best with a 2mm air gap with the dual magnets and another core of the same core material may perform best with a 1.7mm air gap.  You would then need to match all four cores that perform the best with the same air gap.  The expensive scope won't allow you find the best air gap if each of the cores and magnets have a slight difference in the air gap requirements.

The patented measuring device will allow you to match the cores and magnets for maximum performance and to know the optimal parameters for the build.

The patented measuring device may be the reason why their business model is selling licenses for this technology.  Without this measuring device, it may be nearly impossible to replicate the Orbo successfully. 

The hard disc drive tolerances goes way beyond lining something up.  The tolerances are so tight across the entire build, Steorn wants to pass it on to the developers and manufactures by selling licenses to use their patented measuring device in order for this technology to get into the market much quicker.

I still think this can be built in the average garage.  The patented measuring device doesn't look difficult to build or to use.  I really hope people take a really good look at the patent on the measuring device.  There is good reason why they patented the measuring device instead of the Orbo, because it can't be done without the measuring device.  Just my thoughts on it.

[Edit:]  I'm going to start a new thread on the measuring device so I don't clutter this thread.

GB