On Sunday 27 March 2016 23:01:55 Jon Elson wrote: > On 03/27/2016 03:35 PM, Gene Heskett wrote: > > This motor crawls at its top speed, might be turning 400 rpms, and > > fleabay can supply a stronger motor, but where can i source a psu > > that would turn it at 1000 rpms under load? Those for steppers seem > > to top out at 60 volts, but that qould probably need at least 100 > > volts at 7 to 10 amps to get real speed, say 75 IPM out of it. > > If you take a step down transformer (often available at > scrap prices) and set it for 240:120 V, but supply it with > 120 V, you get 60 VAC out. Run that through a bridge > rectifier and capacitor input filter, and you get about 84 V > DC. That works pretty well, and can use some junk box > components. If you can come up with a transformer with a 24 > V secondary, you can use that as a boost transformer, and > putting about 144 V into the step down, you'd get about > 70-75 V out. That will give 99-106 V DC. > > > My back is screaming, worked too hard trying to put our basement > > back together far enough to be able to do some laundry, but didn't > > get it done as I thought this might be a good time to fix the burned > > off connection to one of the heater coils in the pan on the rear of > > the drum. But before I pull the drum, I'll drop the card for a new > > one as this one is 35 yo or more. It doesn't owe me a thing. > > Neither does the top loading, never quite rinses all the soap out > > even with a 2nd cycle with just water, Maytag of similar vintage so > > 2 new machines may be on a truck by Tuesday latest. > > > > I am looking at the pricy SamSung offerings as being a cut above the > > rest, anybody else have any other good recommendations? > > Cheers, Gene Heskett > > I don't know that much about dryers. We switched from > electric to gas a few years ago. I have done some > maintenance on it, and it seems to keep chugging along. We > got a very fancy ultra-efficient washer and it does what it > says. But, the engineering is not as great as they claim. > The controller board has about 12 electromechanical relays > on it, running inductive loads without any snubbers. The > relay for the cold water valve failed, and I replaced it > with a very jury-rigged SSR, and it has worked fine. But, > there is not enough space in the thing to replace ALL the > relays with SSRs, unless I find some REALLY small SSRs. > This thing has a direct drive motor. The main bearing and > seal went bad, and the dripping of detergent water fried the > motor (3-phase brushless). Fortunately, the motor drive > survived that. Well, now that I've done the procedure, I > know how to do it next time. I think both of these are > Sears Kenmore. Might not recommend those, as they might end > up going out of business.
Yeah, I don't think they can survive another 2008. > Jon I thought of that Jon, but I don't have a shoe horn stout enough to make all that fit where the 60 volt switcher is sitting now. I have not investigated to see if there is a voltage trimmer on that supply. Even another 5 volts would help. Too bad I can't hang it on the spindle motor supply, but I've have to figure out a way to buck that 124 back down to the H version of that driver's rated 105 or so volts. And that bucker would have to survive the 150 or more peaks when it does a fast spindle motor reversal. This DM860 is the 80 volt rated version & its chances for survival when hooked to the spindle supply would be less than that famous snow ball in hell. Sigh. Thanks Jon Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785471&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
