junque col
Member
Registered: 04/28/05
Posts: 3328
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Go over to "PracticaMachinest.com.) They have a forum devoted to VFD's and phase converters. Include diagrams and pictures of shop made converters.
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Bob Vaughan
Member
Registered: 09/02/07
Posts: 837
Loc: Roanoke VA
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There's another 'gotcha' detail in the single phase transitio The feed motor. On the early models, Delta used that special base Delta motor. Also, the capacitor has to be off to the side. When I swapped one out to single phase years ago, I found an old Delta double shaft scroll saw motor and cut off the back portion of the shaft. The VS pulley on the motor will have a 1/2" bore, so there's some fussy frame dimension numbers to deal with.
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closed for business
Invalid Declaration
Registered: 02/17/07
Posts: 7305
Loc: South of Columbus OH
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I have a 5hp 3 phase sitting in my garage that I could give you a great deal on if u want to go the static from grizzly route. The feed motor should be easy to swap to a 3/4 or 1 hp one phase. Should only have $50-75 in a motor for that. The big issue is the primary motor. Pm me if you want to talk on the three phase 5hp I got.
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My Day Job
Good spin, but I didn't conveniently ignore anything. I addressed what I chose to address. ~CharlieD 9/15/11
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Rick F
Member formerly Jokerbird
Registered: 05/28/08
Posts: 4949
Loc: Vancouver Island Canada
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Time to get a rotary converter.. It will open up a whole world of possibilities ..
figure on $1000 Shipped for a decent one ..
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Huxleywood
Member
Registered: 12/29/10
Posts: 30
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Time for an RPC since I think you are going to have a HECK of a time finding a single phase motor to fit where the 3ph feed motor does! Probably in the $850 range for a ready to run 10hp RPC (which SHOULD start the 7.5 and run the both). The cheaper would be to build one with a surplus idler motor.
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Rick F
Member formerly Jokerbird
Registered: 05/28/08
Posts: 4949
Loc: Vancouver Island Canada
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If you go with a rotary converter, you can eventually wire it into a 3 phase panel, and supply a bunch of tools from the same converter.
It opens up a whole world of possibilities..
I was at an auction recently and bought a 3 phase lathe,
A few guys from town who knew me came over and asked how I planned to run it .. They wanted it, but didn't bid on it ..
Truth is, a 1hp lathe can be converted for about $120.00 but most people are still not up to speed on the technology..
I ended up also picking up a General Canadian 14" Planer for $625.00 .. 3hp x 3 phase..
Used 3 Phase machinery goes cheap, and is usually higher quality than the single phase machinery available..
Look at the deal you got on that planer.. Those deals are common on machinery that is 3 phase, especially over 3hp ..
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Popeye1
Member
Registered: 05/12/11
Posts: 21
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After some research and hearing all your opinions here, I am thinking I need to find a converter somewhere.
I think I would be ok with just a static converter and have it operate around 5hp. However, that leaves me with the problem of the feed motor still.
What I am considering is buying a static converter for 7.5 hp and a used 5hp 3 phase motor. I will then switch the 5hp and 7.5 hp motors and use the 7.5hp as an idler motor to make the static converter into a rotary phase converter. That way it will still have 5hp of power, I can run the feed motor also, and I will have a 7.5 hp rotary phase converter for the next time I find a deal on a piece of equipment.
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JGrout
member
Registered: 08/04/02
Posts: 23302
Loc: Axial CO
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Your solution will work. we did the same thing with a screw drive car lift 7.5 hp 3 ph motor on the lift and it worked out very well. Our pony motor was 10 HP (what we had laying around) but with no load it would start and once spinning would just idle along.The first attempt was with just the static converter and it would lift a car up about 40% of the way and quit.
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Huxleywood
Member
Registered: 12/29/10
Posts: 30
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Sounds like a good plan 5hp is fine for a 18" unless you are running at a production level.
Be aware using a 7.5hp idler motor for a RPC will run both motors at the same time fine, however it probably will not START both motors at the SAME time.
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Popeye1
Member
Registered: 05/12/11
Posts: 21
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Huxleywood said:
Sounds like a good plan 5hp is fine for a 18" unless you are running at a production level.
Be aware using a 7.5hp idler motor for a RPC will run both motors at the same time fine, however it probably will not START both motors at the SAME time.
Good point. Shouldn't be hard to start one then the other. Now I have to figure out where I am going to get another 3 phase motor.
Any ideas?
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