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

[Magluvin]

Paul, the IRF540 on-resistance is something like 0.07 ohms.
Are you sure it is switch on properly?
If you use a diode in parallel (flyback) with your coil it's even more effecient.

Also you can imagine a few irf540 in parallel to lower that .07 ohms  =]

Mags

[teslaalset]

deleted

[maw2432]

How useful will a PC based Oscilloscope using a A card be for the task at hand, http://www.micahcarrick.com/06-06-2006/pc-A-card-oscilloscope-linux.html

A buffer hardware circuit could be used to buffer the probe similar to a true oscilloscope and protect the PC's Line In from excessive voltages.  Would I need the buffer hardware circuit, or could I get by with just protecting the PC Line In with a Voltage Divider.

I don't have the money to buy the real thing.  I know being cheap isn't the best thing, but it has to be better than nothing and doing it totally blind.  Any thoughts?

Thanks,

GB

GB,
Not sure about that setup  but I found this scope at a low price of only 287 US dollars.
Lots of features. Also comes with USB out to computer.

http://www.saelig.com/PSBEB100/PSSA002.htm

No shipping charge in US if regular UPS ground.  No tax in NC.   

[maw2432]

Hello all,

I have a question for those who understand magnetic effects.   From my understanding the magnet pairs are N and S on the Steorn motor.  From the Steorn forum it seemed it did not matter which way he had them.   But has anyone considered alternating the pairs...... one N and S ..... then the next set S and N and so on??  What effect would this have on the core?  Your thoughts appreciated.   Anyone testing this?

Bill

[teslaalset]

Hello all,

I have a question for those who understand magnetic effects.   From my understanding the magnet pairs are N and S on the Steorn motor.  From the Steorn forum it seemed it did not matter which way he had them.   But has anyone considered alternating the pairs...... one N and S ..... then the next set S and N and so on??  What effect would this have on the core?  Your thoughts appreciated.   Anyone testing this?

Bill

I don't think alteration of the  N-S orientation matters that much.

What does matter is that the magnets don't have too much different strength, something that has not been discussed here.
In other words, the magnet tolerances.

It has been found that the alignment of the position of the toroid coil is extreemly important to cancel out CEMF.
You can do that using one pair of rotor magnets.

But when the magnet pairs at the different positions of the rotor have, e.g. 20% different field strengths, the allignment of the coil is not optimized for that pair
of magnet.

So selection of matching pairs of magnets will be required in my view.