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6th Apr 2014, 08:17 PM #16Member: Blue and white apron brigade
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Gentlemen, we have a successful conversion - I'll let Bob tell the story as he also has the photos.
If only they were all this easy.
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6th Apr 2014, 10:56 PM #17.
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The star point was the neutral terminal. Bob cut away some of the binding in the location of the fattened brown spaghetti and found where the three yellow spaghetti-ed wires entered the grey neutral. The surgery turned out to be minor. Thanks to Bob's efforts and expertise I now have a motor I can use and I'm sure looking forward to using the No.1.
Thank you again Bob.
BT
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6th Apr 2014, 11:40 PM #18Member: Blue and white apron brigade
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No worries Bob.
If only they were all that easy, minimal dismantling of the binding materials, and found it first go - after your bit of sleuthing on the grey wire with Joe's help.
Actually we were lucky all 3 wires forming the STAR point were accessible inside the terminal box as there was bugger all room to get three wires back up from the windings into the connection box.
Bob, you forgot to take home the nylon cord if you wanted to just tie up that one section inside the windings.
I reckon all you need at that point is a dab of epoxy and it should be fine.
Don't forget your chainsaw next week.
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7th Apr 2014, 01:22 AM #19
Nice work BobL and BT, good to see the forum network working so well.
Funny about the star point being already brought out? I can't think of any reason off hand why you would do that, other than, maybe it was a motor wound for 6 wire connection? And they were just saving a few cents on terminals.
Ray
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7th Apr 2014, 08:38 AM #20.
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Bob performed the surgery, I pretended to be the nurse.
When I bought a VFD for the little Hercus mill I searched around and found a replacement Star Delta ASEA for the mill's original flange mount Star wired ASEA motor. The flange mount motor was a factory modified foot mount. They milled the feet off. The replacement was a foot mount and me being anal meant the feet had to go. So after a bit of fiddly milling I had a motor that looked the part. The cast iron flange / motor end cap was interchangeable. I bet the original motor was wired like the grinder's ! I'll have a look.
I mentioned to Bob that the workhead motor requires conversion. He suggested that a lot of fractional horsepower motors had Star Delta connections. I had a quick look last night. It doesn't even have a terminal block. I'll post some photos.
BT
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7th Apr 2014, 08:48 AM #21Most Valued Member
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you all beat me to it....
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8th Apr 2014, 01:35 AM #22.
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I had said to Bob that I would pop the workhead motor apart and photograph its innards. Looking at those red wires disappearing is not real encouraging. I tried to ease the stator out but it's tight, that tight that I don't think it will move.
The motor is a 1/30 hp 4 pole. Sounds gutless. I though I had a small frame single phase motor that might act as a stand in. Unfortunately the motor is not a TEFC version so it would probably last a couple of minutes if I was lucky after ingesting metal dust.
The "terminal" box looks particularly dodgy.
BT
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8th Apr 2014, 02:00 AM #23
That looks pretty well built. The terminal box could be improved a bit - agree
Having the red connections going down the slots is a good way to secure them, although I suspect the connections are actually at the other end.
Now show us the other end of the coils. We may be able to help find star point.
Actually, you may be able to find it like this: the red wires go into the start of each set of the 3 lots of 4 coils (the 4 poles). They are easily visible in this arrangement. Now go the other end of each of the sets and you may be able to see their sleeves crossing over from one set of 4 to another. Assuming they join near one of the sets, there will be two longer sleeves crossing over to the third set (of 4). where they meet is the star point. If you are lucky that is near the unwrapped inner set. If not, you will at least see the sleeve coming from the unwrapped set. Follow that one and check if you can see which one it goes to, then find the one coming from the other wrapped set. Bingo
When you have got it going on a VFD for testing, let me know if you need a suitably sized small VFD, I may be able to helpCheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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8th Apr 2014, 08:43 AM #24.
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Here's a photo of the other end of the motor Joe. Unless I can pull the stator out I can't see where those wires go.
Bob.
ps. I'm wondering if I can make a puller and remove the stator??
DSCN6139 (Large).jpgLast edited by Anorak Bob; 8th Apr 2014 at 09:35 AM. Reason: a bit added
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8th Apr 2014, 11:06 AM #25Most Valued Member
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Well they couldn't both be easy Bob.
Is there a bolt under the foot holding the stator in?
Stuart
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8th Apr 2014, 11:30 AM #26.
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8th Apr 2014, 12:12 PM #27Member: Blue and white apron brigade
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What about a hot air gun on the outside of the motor and then tapping it firmly onto a couple of pieces of wood?
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9th Apr 2014, 01:16 AM #28.
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No Bolt. No Budge
The red wires just buried themselves. Sadly there was no easy fixing securing the stator and an application of heat and some careful slapping onto a bock of wood achieved nothing. I'm thinking of modifying the bearing puller I knocked up a while back and having a go at pressing the stator out. Not much to lose.
BT
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9th Apr 2014, 04:38 AM #29Member: Blue and white apron brigade
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9th Apr 2014, 05:11 PM #30Most Valued Member
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Before we start pressing things(or pulling).
Are we 100% sure the star point will be at the far end?
Stuart
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