2010/10/22 vasile surducan <[email protected]> > > > On Fri, Oct 22, 2010 at 11:43 AM, vasile surducan <[email protected]>wrote: > >> >> >> On Fri, Oct 22, 2010 at 10:56 AM, vasile surducan <[email protected]>wrote: >> >>> >>> >>> On Fri, Oct 22, 2010 at 10:06 AM, Sebastien Lelong < >>> [email protected]> wrote: >>> >>>> Hi Vasile, >>>> >>>> 2010/10/22 vasile surducan <[email protected]> >>>> >>>> Hi Seb, >>>>> >>>>> Looks to me that you have understand well that different DC motors will >>>>> give you different EMF values: >>>>> >>>>> http://sirloon.net/loonaweb/sirblog/experimenting-back-emf-motion-feedback >>>>> <http://sirloon.net/loonaweb/sirblog/experimenting-back-emf-motion-feedback>So, >>>>> that's it, a poor method using an analog feedback, if you want universal >>>>> solutions seems to me you have to switch on digital feedback, which as >>>>> far I >>>>> know can't be EMF. >>>>> >>>> >>>> Do you mean something like encoded wheels ? bemf is really nice to have >>>> because it's not invasive, you can control any DC motors without modifying >>>> the structure (which is great when hacking RC toys) >>>> >>>> >>>>> You can't do it without modifying dividers. >>>>> >>>> >>>> Is electronic that limited ?? C'mon, there should be a trick ! >>>> >>> >>> Variable gain amplifier. It modifying dividers in software keeping the >>> ADC resolution constant. Still a s**t... >>> :) >>> >>> >> There is another way: when read EMF the motor acts as a generator. >> Loading it with a variable resistive load (switched digitally using some >> transistors) will decrease the EMF level as you wish. However that will >> brake the motor as well, as high as the load becomes lower. Probably with 2 >> loads you can use two different DC motors. >> Do you intend to manufacture some kits? >> > > > Ok, thats the best ideea: an active load (programmable constant current > source) >
Any readings about this (for humans) ? > driven by the 16 level internal reference voltage, switched on the motor > coil only when back EMF is read. > 16 levels internal reference voltage ? What do you mean ? Thanks, Seb -- 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.
