3 phase/1 phase 220

B

billf

Joined
Oct 9, 2003
Messages
1,561
Hey electrical guru types -

I have 220 single phase power, and I've read some of the threads on converting 3 phase to single phase, but basically, I need to know if I can run a small surface grinder (6 x 12 size) which is 3 phase off a static convertor, or do I need a rotary phase convertor:confused:

Thanks

Bill
 
A static convertor should work fine. Just be aware it will not develop full power.
 
Personally, I would not use a static phase converter on any 3 phase motor.
As has already been stated, it will not develop full power but may ultimately damage your motor if you try to push it.
You're far better off to run either a rotary phase converter or a VFD.
My solution to this problem has been to run all my three phase motors on a VFD (variable frequency drive). The price on these has come down to where they are quite reasonable. Just make sure the VFD will run on single phase input (at whatever your shop voltage is) and rated for at least the HP of your motor and you're in business.
You can set the VFD to run the motor any desired speed or direction and you can set things up to run any number of motors off one VFD (as long as you only run one motor at a time).

Just my $.02

-Mike-
 
When I got my mill, it came with a 5 hp 3phase motor and I only have single phase...sooo I did some research and found out how to build my own static converter...when I first fired it up, it worked!...but I could tell by the sound of the motor that it wasn't balanced, so I put amprobe on the two real legs and the ghost leg and found that they weren't all the same amperage so I juggled the size of the capacitors until they were and voila that 5 hp purrs like a kitten but its only delivering about 5/8 of its rated power but I didn't need all of it anyway! So I guess ya might say it depends on the size of the motor and how much power ya need...after this experiance I think the static type converters need to be tuned to the motor at hand.
 
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