The Ossie motor

[gyulasun]

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Effectively the amps went dow almost by the half with  4.7 kohm resistor at the collector . Can i try higher resistor value or will it destroy the transistor ?

Hi Laurent,

Yes you can use a higher value resistor but do  not go higher than 10-15 kOhm because switch-on time of the FET may suffer. (You cannot destroy the MOSFET by changing that resistor value to anything.)

My tle 4905 is rated at typical current 3 to 7 max miliamps , do you know better one ? 

Will study this, at the moment I am not sure there are much types with lower current consumption.

What is this circuit that Tropes mentionned in the above post, do you know it ? 

He asked me last year to give him a schematic on his opto interrupter device for his piston motor and he used different battery voltages for his motor tests (12-24V) and this involved using different resistors in series with the input diode of his interrupter. So that he should not bother on changing that resistor whenever he changed battery voltages he used a small 2V battery just for the input diode and this made his opto interrupter input side independent from the 12-24V side. Here is that circuit by the way:
http://www.overunity.com/index.php?topic=3318.msg83314#msg83314  (it may need a 15V Zener diode between its V_cc and GND pins and series 3-4 kOhm resistor from its V_cc to the 24V battery input if there is a need for 24V operation, to protect the interrupter from excess supply voltage.

the charge consume a lot of miliamps very shortly (some seconds)  until the cap was at 12.5 volts than until the 56 volts   charging process DO NOT TAKE ANY MILIAMPS  at the motor as if the cap nor bridge was there. I tried to diconnect the cap than the bridge and reconnect it  and the amps stay  at 10 miliamps  steady   The charging process uses only the flyback spike.

'The lot of mA' consumption in the first moments of the cap charging is normal, I mentioned a discharged capacitor is a short circuit at the very first moment the charging starts, then this peak current exponentially reduces as the voltage increases across the cap. After the voltage across the cap is about the same as the pulse amplitude that was rectified to charge the cap, there will be no any loading effect of the cap on the pulse. However the moment you take charge away from the cap i.e. you start using the stored voltage of the cap, the loading effect appears on the pulse again, proportionally to the charge consumed from the cap.

rgds, Gyula

[neptune]

@Jimboot . Re the cicuit using the torch motor to charge a battery thru a diode . use a switch to short out the diode once things get up to speed . this will save energy waste in the diode and improve charge rate .

[captainpecan]

I like it CP, except the bit about tuning 3 reed switches. The simpler te better tho I think.

I know exactly what you mean, I've already ruined my 3rd reed switch on my project.  Which is the reason I was banging my head against the wall to start.  The reed in the picture though would be set to only trip once per revolution or so to dump the caps.  Either way, i'm not sure how well it work anyway, just something I was kicking around, as a way to get some extra charge from that rotor motion.  May be able to use a zener diode to keep the caps dumping at a specific voltage.

[woopy]

Hi all

a lot of learning today and  so interesting

Thanks Gyula  and Cp and Ms and Jb  and all contributors

Now i have separated the trigger sensor circuit  from the power motor  circuit  see pix 1 schematic. And so i can look at the real current  consumption of the motor. And i can confirm a small 2 miliamps for the motor itself under 12.2 volts battery, and a 3 miliamps for the Hall circuitery undewr 4.1 volts.

And this evening i concentrated the efforts to get the form of the pure motor impulses current. This is made with the scope probe across 1 ohm resistor at the + of battery and the circuit

And the scope shot shows  different  variation dependly of the Hall sensor position on the magnets . See the 2, 3, 4  pix .

What is BIZARE is that on a single pulse the current goes Sharply up than down and may be negative  in a U shape (pix 3 ) and goes up again to a strong  positive spike  and down   is there any interpretation of those scope shots ?

regards

Laurent

[Schpankme]

Have tried Ossie but with two coils only. Seems ok, running for long time; maybe with 4 coils it gets better…
http://www.youtube.com/watch?v=6EZKxu5qTJI

Light (Mopozco),

Your video shows a circuit very similar to the one attached.   

- Schpankme