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

[PaulLowrance]

Real quick for legit researchers: When the magnet is at TDC, the circuit first stage pulses coil with *high* voltage for ~ 25us to get the current to its peak. During this pulse the circuit is nearly 100% inductive. Second circuit 2nd stage pulses coil with *low* voltage for the remainder of the pulse width, which I've varied anywhere from 10 to 21 degrees. Second stage the circuit is resistive, and is part of the electrical wires losses, which can be decreases relative to the output by various methods.  Resistive losses remains the same regardless of rpm. Inductive losses increases with rpm. As stated, most of the inductive energy can be captured back-- e.g., my 95% example.

[gyulasun]

Can someone probably answer my question which optical sensor to use when timing the pulse? Over an hour of internet search didn't bring me results.
Like the optical sensor in this image: http://jnaudin.free.fr/steorn/images/steornv3b.jpg
Anyone? Name, Part number, shop link, whatever. thanks.

Hi,

They are called opto interrupters and here are some types with prices:

http://www.elfaelektroonika.ee/cgi-bin/web_store.cgi?ec=25a6b1c&lng=eng

Naudin used a T shaped black color (probably plastic) light blocker that interrupts light between the light diode and light sensor. I have not seen his mentioning what type he used.

rgds,
Gyula

[Paul-R]

Hi,

They are called opto interrupters and here are some types with prices:

http://www.elfaelektroonika.ee/cgi-bin/web_store.cgi?ec=25a6b1c&lng=eng

...and before anyone despairs at the cost, you get 18 to the pound sterling.

[gyulasun]

...and before anyone despairs at the cost, you get 18 to the pound sterling.

Yes,  I think at the ELFA link the prices are in EEK.

1.00 Estonian Kroon = 0.0870 U.S. Dollar nowadays.

Gyula

[haithar]

I wrote an E-Mail to Naudin and kind as he is i got an answer. He was recommending the rpi-441c1 from Rohm semiconductor, but since i cannot get this part from a shop here i chose the CNY70 along with a Schmitt-Trigger IC for perfectly sharp triggering.