No announcement yet.

+Phase converters

  • Filter
  • Time
  • Show
Clear All
new posts

  • +Phase converters

    I know this is a little off topic on this forum, but wondering if anyone out there know anything about phase converters. I have a shot at picking up a good used 14"x 36" lathe from an old friend of the family at a steal of a price!
    Problem is it is 230/440 3 phase electrics. I do not have 3 phase in my shop but looking in to phase converters, which type,static or rotary? Static is a lot cheaper but will it hold up ,or why so much cheaper?
    /22x45 concrete slab with 2 overhead cranes(trolley style with electric hoist, huge shade tree to weld under
    33x33 enclosed shop when its to cold or windy outside
    miller 210
    miller 875 plasma
    victor oxy/accet
    unihydro 45ton ironworker
    miller 180 tig
    ole lincoln ac/dc buzzbox
    milwaukee power tools
    and everything in between
    2007 trailblazer 302
    Bailiegh 210 miter saw-2008
    Beer Fridge
    6000# cat forklift
    36" port-a-cool fan
    Dake G-75 Belt grinder
    3035 Spoolgun

  • #2
    I use a vfd[variable frequency drive] on my three phase vertical mill. You need to match it according to the horsepower of the motor.
    Dynasty 200DX "Blue Lightning"
    Bernard 3500ss water-cooler
    Rockwell vertical mill
    Beverly Shear B-3
    Beverly Shear JR
    Home-made English wheel
    Milwaukee Porta-band
    " Sawz-all
    Tennsmith 36" stomp shear
    Fixer upper 1968 Redface Lincoln sa200
    Powcon 300st


    • #3
      I would recommend going with a rotary type converter over the static. The rotary type converters will minimize (or eliminate) "loss of HP" when going to 1Ph. Phase-A-Matic is a good company that can sell you a good converter. Their phone number is 800-962-6976.


      • #4
        I won't go into too much detail as this has been covered before.

        Anyway if your motor is 3 Horse power or less a VFD Variable frequency drive is the best way to go. But you need to up size it by about 50% to 100% as the inrush current a motor needs can be substantially more then the VFD is capable of putting out even though it is rated for the HP of your motor.

        So a 1 HP motor should get a 1.5 to 2 HP drive a 3 HP motor should get a around 3 to 4 HP drive.

        Anything bigger then that and a VFD will not work as they don't generate a third leg of power with having on two legs of incoming power. It just requires to much amperage to do it correctly.

        You'll notice this on inverter welders that have a higher output on three phase then on single even though the voltage has not changed.

        Chances are the lathe you mentioned has a 2HP motor or smaller. A VFD capable to fire it up is going to run about $250 give or take.
        And they are simple to wire up as well. No big deal. You just need single phase 220 coming in. thats all.

        Ebay Item # 190366149249
        Is a good start look around I've found them cheeper
        Miller Syncrowave 200 W/Radiator 1A & water cooled torch
        Millermatic 252 on the wish list
        Bridgeport Mill W/ 2 axis CNC control
        South bend lathe 10LX40
        K.O. Lee surface grinder 6X18
        Over 20 years as a Machinist Toolmaker
        A TWO CAR garage full of tools and a fridge full of beer
        Auto shades are for rookies


        • #5

          I had a thread on exactly the same subject here..
          Two Dynasty 350's with Wireless pedals
          Victor O/A
          Profax 250 weld positioner
          Bridgeport mill
          Logan Turret lathe
          RMD tubing bender
          Enco vertical saw
          Baileigh Auto cold saw
          IR 80 Gal dual stage compressor
          Misc Fab equipment


          • #6
            I have a knee that uses a phase converter. A couple things I've found that you might consider, with the digital type you loose about a third of your horsepower as only 2 legs are working, the 3rd leg only works via the phase converter until the motor starts. When you start the motor there's slight delay from the time you turn the switch until it starts. On a lathe the motor usually runs all the times so the delay isn't a real problem. With a rotary type converter you get real 3 phase power so you'll get the horsepower and no delays. The down side is the rotary converter consumes power even if the tool isn't running.
            (aka Fred) back from the penal league
            MM200 (antique and still cook'n) - gone
            Replaced by a MM252
            Lincoln 160 buzzzzzz box - left to live with a nice youngster
            Dynasty 300DX - still kickin'
            Spectrum 625 - ditto
            Chevalier Knee Mill - Bridgeport clone you idiot. - gone
            Homebuilt tube bender - with home made dies no less - now co-opted
            Delta Drill Press & Grinder collection -

            Needed - a bigger shop to use the stuff