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1  Forum 2005-2010 (read only) / Interfacing / Re: Experiences with brushless DC pumps and PWM? on: January 19, 2011, 03:52:54 am
Oh sure! And then you've got Chinese, who don't care answering your mails... While all others down the trade chain have no idea. Note that those pumps have two wires and running at no load seems to be not allowed (so I'd guess, they don't have any memory of previous rotor positions?).
2  Forum 2005-2010 (read only) / Interfacing / Re: Experiences with brushless DC pumps and PWM? on: January 18, 2011, 04:23:21 pm
Linearity is not required, the algorithm should be able to adapt or can be given some approximation. Just I'm concerned about if those pumps can actually be operating to provide relatively small flows with PWM and can they be somehow damaged or consume excessive amount of power. Well, I don't know much about this, so am I asking here.
3  Forum 2005-2010 (read only) / Interfacing / Experiences with brushless DC pumps and PWM? on: January 18, 2011, 05:41:03 am
Hi all,

I'd like to read about other peoples experiences with controlling liquid flow rates by using Arduinos with DC pumps, giving them PWM input... There are some threads discussing this, but I didn't encounter any, which would share the used operation frequencies. In addition to that it seems like the thing should work fine, but still I'm not sure of my chances to run in some trouble with a pump like those from weilibao.com (see WDB-38I, I'm not allowed to post links at first post). I mean if it should work fine with just some 10% of controlled flow rate (or even from 0) and not overheat. Perhaps someone can point to a theoretical/empirical relation between PWM value and {electr. power, rotation frequency}? Are there any brushless DC motors in production, which would somehow get their coil-switching messed up by the frequent PWM power outages?
Anyway, anyone has this kind of thing running just fine, please let me know...
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