On Friday 29 March 2019 01:39:33 Gene Heskett wrote: > On Thursday 28 March 2019 22:01:39 Jon Elson wrote: > > On 03/28/2019 04:24 PM, Gene Heskett wrote: > > > This one has a PM rotor, and it all runs in the bore of a potted > > > stator, which I assume has a shaded pole lashup for starting. I > > > not shaded pole, then it will run synchronously, either direction. > > > If if runs at all. > > > > Yes, the pumps in our washing machine have a PM rotor, and > > the stator looks a LOT like the old "phonograph" motors, but > > without the shaded pole. When the AC is applied, the rotors > > vibrate wildly until they manage to jump into synch with the > > field, and so it starts in a random direction. > > They have a 1/4 turn slip coupling between the rotor and the > > pump that allows this vibration start to develop. Pretty > > crazy scheme. > > > > Jon > > There is no such slip coupling in this pump that I felt. The nylon > paddles are firmly attached to the pm rotor. So I wonder if that has > become frozen from sitting 3 days or so. I've not changed the > distilled water for the rv antifreeze yet. So I'm mentally questioning > if the antifreeze would have an lubricating effect that would restore > this slip by lubricating it. > > The water has slowly turned slightly yellow, so there is something > reacting else it would remain clear. This is not purified by osmosis, > but is steam distilled according to the label. When I am next near the > tank, I'll check the waters resistance. > > I have a feeling it will be well below a megohm. > It was down to 175k. And I've seen drinking water tested better than that.
Anyway I threw out the distilled water and about 1/16" of a yellow sludge got wiped out of the tank, and took the pump apart, looking for a good reason it wouldn't start, and may have found it. The nylon stem that runs thru the magnet is about 10 thou oval shaped, and so it the molded in hole thru the megnet. In other words, that 1/4 turn of play was there, but its possible the oval got wedged in the oval. Looked the axel over carefully, but it was highly polished and fit freely thru the impeller and magnet, zero drag there. Put it back together and tried it dry, started every time. About 25 times. Added a gallon of that rv antifreese. Starts every time, tried that at least 50 times, but noted I was getting bubbles out of the motor at every start. Pulled the return hose clear and watched it back drain down toi the level in the tank, but no farther. Traded input for output on the pump, and after half a gallon, no more bubbles out of the motor. Stop, let it backdrain again. Start, no bubbles from the motor. Several times, so it appears there is a preferred flow direction even if the ports on the motor aren't marked. So left it that way. And its now started instantly at least 50 times. So maybe the RV antifreeze is just enough lube to keep the nylon axle from wedging into the magnet. I don't have any other theories. Wash the anti-freeze off my arm, and letting it rest to test starting again later Anybody else? This would appear to be one of those designs that like JRM said will run 25 years IF you never shut it off, but leave it sit for 3-4 days and all bets are null and void. I now have all the wires thru the cable chain, and from there up to the electronics shelf in a new, bigger tube of expandable cambric but nothings wrapped down yet nor plugged back in, feet are screaming. And I still need to design a switch mount with about 1/8" of crush in it so I don't smash up the little bitty button switches I bought for home & limits. A quick check with that 16 feet of cap tube in series with the mister liquid looks like that might do it but haven't pressured it up yet, waiting for superglue to hit max strength. I've also had a round with amazon. They had an old card #. So I added the current one but couldn't find a place to delete the old one. But their system insisted on trying to use the old canceled numbers even after I gave them the new nums. Getting another failure message advising things were on hold last night, I found the chat button after canceling everything they hadn't shipped, and gave the automated chat a bit of what for. I'd already found the vfd at about a dollar more someplace else. And its here in the states, not Changslut, China with a 6 to 10 week delivery. Are they being that dumb just to hassle people out of Prime? IMO that has to be terminally dumb, or on purpose. > Cheers, Gene Heskett 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> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
