SSG Minimizing Trigger Winding Losses

[synchro1]

Reeds are good for low power motors,but once you start getting up in the higher power ranges, you start doing some arc welding with those reed switches,and they dont last to long.

Opto coupler and a fet is the way to go,where you power the opto coupler from the inductive kickback.

@Tinman,

Right. I'm not at all impressed with the rotor speed of TinseKoala's MHOP. I wonder how the top end of the MHOP really compares to some of the other configurations? Looks like a weak "Slow Poke" circuit to me so far.

[MarkE]

One thing that TK's rig does that is very good is squae up the drive signal.  That is good for efficiency.  Other amplifier methods such as using an optocoupler can achieve similar ends.  Mechanical switching such as with a reed suffer rapid wear-out  especially if arc suppression is not employed.

[MileHigh]

Thanks for the suggestions.
I will look at TK's MHOP once I'm done with SSG mods.
I have a new version coming up that I think is worth some attention,
but probably not until next week unless unexpected extra time shows up.

/Hob

I will also just state the obvious that I did not state.  There is a very good chance that a MOSFET will do just as good a job as the transistor.  With an op-amp and MOSFET combination you can probably reduce the average power required to control the timing of the switching function for the main drive coil to a few milliwatts.  So you effectively nearly eliminate the overhead for the timing and switching and can then focus on the power in vs. power out for the main drive coil.  As we know, the shorter the time allocated for energizing the coil, the lower the resistive losses to heat.

[MileHigh]

@Mileigh,

I can spin a rotor with a simple reed switch in series with a battery at extremely high RPM with even less amp draw. You're complex MHOP circuit looks like a real dog by comparison. My rotor goes at least ten times as fast for even less input with merely one componant.

Just like Mark said about you in another thread with respect to him, for both your comments here, you are just trolling me.

[synchro1]

Just like Mark said about you in another thread with respect to him, for both your comments here, you are just trolling me.

How fast is it? Have you or anyone else tested it for speed?

That other Airhead denies pressure causes heat. You're both good at just blasting it out your asses under pressure.