What brand VFD are you using for your lathe?

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Forum topic by Bill7255 posted 03-21-2016 07:57 PM 359 views 0 times favorited 1 reply Add to Favorites Watch
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344 posts in 1706 days

03-21-2016 07:57 PM

I am thinking of converting my PM 90 back to 3 phase with a 2 hp motor. I don’t know much about VFD and there are many out there. I know I need single phase input and 3 phase output. For a 2 hp motor I would need at least 2 hp out. Would 3 hp be more robust and better? Thera are a lot of different brands/models. What works?


-- Bill R

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4031 posts in 1620 days

#1 posted 03-21-2016 08:07 PM

Don’t size based on HP, go by the FLA of your motor. What is the rated FLA of your motor? Most popular VFD is the TECO (Westinghouse), either the older (and cheaper) FM50, or the newer L510. If your motor FLA is 4.3A +/-, you could get by with one of the “1hp” models and save a few bucks. There is no real advantage to oversizing the VFD unless you plan on re-using it with a larger motor in the future.


PS: Another option you might consider is using a variable speed DC motor. You can get 2.5hp PMDC motors free or really cheap from old treadmills, and they have everything you would need except perhaps the pulley. Just another option (and you can run them on 120v).

-- Brad in FL - To be old and wise, you must first be young and stupid

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