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

[captainpecan]

Also, another question that arises.  Assuming that Steorn has done their research, surely they already know about triggering transistors with a trigger coil, and how much more reliable it is.  I'm sure they also know about hall effect.  They proved they know about optical switching on one of the demo's.  Yet they insisted on using a reed switch for their public demo? Of course with only 1.2 volts, a reed switch is a bit more reliable than at 12 volts.  But it makes me wonder if they are simply trying to teach a lesson on the best way to get the most efficiency... K.I.S.S. ...

[mikestocks2006]

Hi All,

Tests I have done have shown that if the attraction between the magnet and toroid core is too great for the particular coil and core material there will be more losses in the process and so a balance needs to be found for optimum operation.

With that, I have found what I consider to be the best possible magnet and coil arrangement for my motor and now have measured the best efficiency for this motor. I don't think I am going to beat this level of efficiency.

Also, I have found that the best way to trigger the switching circuit for optimum performance is to simply wind a trigger coil of about 100 turns around one of the toroid coils.

With my current configuration I can achieve a consistent 750RPM for only 239mW of input power!

Please see the following video for further details and the circuit & waveform across the coils is attached below.


http://www.youtube.com/watch?v=sdSci8CKD74


Also, because I believe I have reached a limit to the efficiency, with the current materials I am using, I believe I will now need to increase the number of magnets, coils and possibly rotors so as to be able to generate some usefull torque and possibly even self run if this is indeed possible with this motor.

Regards,

Ossie

Hi callanan
Bruce_TPU, k4zep and all

Closing the Loop
Feed the power from the trigger coil directly into the toroid.

Now that is seems the power to toroids is reaching lower levels, and for the ones who are using a trigger (pickup) coil for timing, may I suggest to directly feed the power from the trigger coil into the toroids.

There may be more optimization needed for materials, dimensions, permeability initial/final, coil size, core magnetic viscocity effect etc
But as the power required to Saturate the toroid is becoming less and less, there will be a point beyond which the power from the trigger (pickup) coil(s) will be enough to create the effect and thus closing the loop with minimal electronics if any involved.

Towards optimization, rotor bearing friction and aerodynamic drug losses should be minimized, speed increased, resulting in more energy remaining per cycle to induct VI on the trigger (pickup) coil(s) and making it available to the toroids.

Nice work all 
All the best
Mike

[hartiberlin]

Hi Gyula,

I am thinking it is due to imperfections in the coil windings. Whatever it is, with the circuit I am using, this negative voltage bump will help send energy back to the battery via the two feedback diodes. So I don't mind it being there that much...

Regards,

Ossie

Hi Ossie,
could you please show the input current from the battery on a shunt resistor
on a scopeshot ?

I really would like to know, how this small negative bump happens in your other scopeshot.
Maybe the input current directly taken at a shunt resistor makes this more clear ?
Many thanks.

[maw2432]

Could some of you please help with Oscilloscope choice?

I noticed in Steorn's last mini lecture he had a high-end Tektronix Oscilloscope.... but what is really needed for these type of measurements?  Does one really need that high-end scope?   

I found this scope and was wondering if it would do all the measurements needed for testing.

PDS5022S

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

Bill

[darkspeed]

Anyone thought about it this way?