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.
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