So, do you think this is a good method to measure all motor's speed amplitude ? From stall to highest speed ? This is indeed very interesting...
And I like your scope ! :) Cheers Seb 2010/11/2 Oliver Seitz <[email protected]> > > Hi Seb, > > >Do you think it can be "visible" for any DC motors ? The most dirty motors > may give the better results ? (lots of friction, maybe ?) > > I don't think the friction or anything does have a big influence. But yes, > I think all commutator motors will give similar current curves. (It may > differ for compensated motors, but you won't find compensated motors with > less than several hundred watts ;-) ) > > >And, just my curiosity, do you have any pictures about what you've seen on > the scope ? > > Yes, now I have :-) Please don't laugh about my cheap taiwanese scope, I'll > get a decent one as soon as I can afford it. And, yes, I could have > connected it to a computer, but I had no windows machine within USB range... > So there are some clumsy photographs. > > > The motor is a nichibo MD38-14280-R with a 1:180 gear. The motor runs free, > just the friction of the gear as mechanical load. The shunt is 2.2 Ohms. > Power is constant voltage from a laboratory power supply. > > So here are the pictures: > http://johannes.eventify.de/kiste-temp/motor/ > > No. 1 and 2: 7.6V, about 70 rotations per second > No. 3: 3V, about 27 rps > No. 4: 12V, about 108 rps > No. 5: 1.0V, about 5 rps > > The rps are really more guessed than measured, by counting the rotations at > the gear exit for one minute. > > But it is accurate enough to see that there have to be six pulses per > rotation. The motor has three magnetic poles. > > Greets, > Kiste > > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<jallib%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/jallib?hl=en. > > -- Sébastien Lelong http://www.sirloon.net http://sirbot.org -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
