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6th May 2024, 01:35 PM #1Novice
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VFD for my vintage AEI 3 phase motor (running a Dyco Superfine 12" table saw)
Hi everyone,
Thanks for having me in this forum, I have been reading through a lot of threads and the content is amazing.
I have bought a Dyco Superfine 12" Table Saw and it comes with this vintage AEI motor:
motor-plate.jpeg
I have seen the restoration made by Charlie (Dyco 12" Table Saw) and initially I thought of doing the same, but I can't find a cheap single phase motor with a flange mount here in New Zealand (I am on a budget), so I decided to for the VFD solution.
I also have read BobL pinned threads and they are great, I just want to confirm I am doing the correct thing.
This is the current wiring:
motor-wiring.jpeg
Newbie here, but I get from this that it is Y connected, therefore it is configured to use 380/440v at 4 amps? And if I change this to ∆ connection it will use 220/250v at 6.9 amps? Am I correct?
That said, I want to buy one of those AliExpress VFDs and I have my eye on these:
- https://www.aliexpress.com/item/1005005218205809.html (2.2 kW, input 1 phase 220v, output 3 phase 220v, 9.6 amps) - This would require the ∆ connection, right?
- https://www.aliexpress.com/item/1005006254303884.html (2.2 kW, input 1 phase 220v, output 3 phase 380v, 5.1 amps) - This would allow me to keep using the current Y connection, right?
Cost wise they are similar, costing between 80 and 100 NZD.
Another question is: to plug the VFD to the wall socket, I need a 15A plug or can use the regular 10A?
Many thanks!
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6th May 2024 01:35 PM # ADSGoogle Adsense Advertisement
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6th May 2024, 06:21 PM #2
Either one will work. Go for the 2.2kW version. A 10A plug will be fine.
To connect in delta, remove the (dodgy) bridge and replace it with three vertical bridges. You would need to put a meter on the windings and make sure they are wired to suit the 3 straight bridges first of course. A bit of insulated wire with a lug on either end would be a better bridge than whats there.Those were the droids I was looking for.
https://autoblastgates.com.au
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6th May 2024, 06:23 PM #3
I think 2.4kW is the limit for a 10amp plug, so you may get away with it. However start loads will exceed 10amps briefly - and if the "briefly" is too long it will blow your fuse/circuit breaker.
The beauty of a VFD is you can set them for a soft start and thereby reduce the start load.
You may find you need a much higher rated VFD to allow for motor loads - but I'm no expert on this - so hopefully someone who is will be along soon.
Cheers, Vann.Gatherer of rustyplanestools...
Proud member of the Wadkin Blockhead Club .
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6th May 2024, 06:39 PM #4Novice
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7th May 2024, 11:34 AM #5.
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Ordinarily because of the high start up currents a 15A Socket with dedicated 15A breaker would be needed for a 2.2kW motor
BUT
If you use VFD you can program it to "slow start" so the currents don't exceed 10A so you can use a 10A Socket.
Just bear in mind that if you continually push the table saw too hard it will easily draw more than 10A - I can get mine to draw 17A before it trips the thermal fuse on the motor..
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7th May 2024, 08:06 PM #6
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30th May 2024, 11:54 AM #7Novice
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The VFD arrived and it works!
Update!
I have disassembled the motor, cleaned it up, regreased the bearings (they are still good) and changed the connection to delta.
Then the VFD arrived and I just tested it, it works! Check the video bellow (please don't mind the mess my workbench is :P)
Now I am going to do the final wiring and make a nice enclosure for it.
Cheers!
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30th May 2024, 10:54 PM #8GOLD MEMBER
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Key steel
A nice win! I am a bit surprised that the piece of key steel on the shaft didn't get launched into space, might be worthwhile either removing it or put some tape over the key and shaft next time you have a play with your new toy.
Alan...
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31st May 2024, 10:24 AM #9Novice
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