Ray Marinaccio said:
I never did build the onboard PWM module but did sketch out a few schematics. I had a momentum feature incorporated into one of them. That's one of those projects I need to get back to.
I think you have a point about the low voltage and dirty track.
If you used a pulse throttle that pulsed 12-18 volt pulses, would that overcome the problem?
Ray,
In my opinion, I doubt that the pulsed throttle would make that much difference. Yeah, a higher voltage would have the tendency to break through the oxidation better then the 3 volt source, but remember, to achieve the average lower voltage, the pulses are really short and far between and may not be there long enough to make a big difference. That is my opinion and I'd like to hear someone else's thoery, or facts on this.
One thing about using a pulsed throttle, as you know, the peak voltage remains constant and the pulse width varies to obtain the "average" DC equivilant. I'm not sure how long a 3 volt motor would handle those 18 volt spikes. One thing I do know is that you cannot run a 3 volt incandecent lamp off of the pulsed output, even when it's set for 3 volts. I was checking a light bulb the other day and was too lazy to get out my vriable DC supply and so I set my throttle output for 3 volts and tested the bulb. Well, it was good, yeah, for about 10 micorseconds it was, since what it really saw was the peak voltage and not the average. Hmm, little flashlight bulb lit up thw whole room it did....