VFD for single phase induction motor?

Started by September 28, 2018
Is this possible? I have a customer, a glass artist, who uses several
very nice but old glass grinding machines. There are only 4 speeds on
these machines and he would really like more speeds. He has a newer
machine with a VFD on it and asked me how he could get the same thing
on his old machines. I told him he really needs to change motors to 3
phase. But he is loathe to do that. I can see why. First of all the
motors are beautiful. Secondly they are protected from the water that
splashes on them, being totally enclosed. They also run very smoothly,
having a run cap and great plain bearings. I would want to keep these
old machines original too. Anyway, is there any sort of practical way
to feed a cap run single phase from some sort of variable frequency
drive?
Thanks,
Eric
On 2018-09-28, etpm@whidbey.com <etpm@whidbey.com> wrote:
> Is this possible? I have a customer, a glass artist, who uses several > very nice but old glass grinding machines. There are only 4 speeds on > these machines and he would really like more speeds. He has a newer > machine with a VFD on it and asked me how he could get the same thing > on his old machines. I told him he really needs to change motors to 3 > phase. But he is loathe to do that. I can see why. First of all the > motors are beautiful. Secondly they are protected from the water that > splashes on them, being totally enclosed. They also run very smoothly, > having a run cap and great plain bearings. I would want to keep these > old machines original too. Anyway, is there any sort of practical way > to feed a cap run single phase from some sort of variable frequency > drive?
Disconnect the capacitor and use three phase drive,
> Thanks, > Eric
-- &#1578;
On Fri, 28 Sep 2018 23:21:30 -0000 (UTC), Jasen Betts
<jasen@xnet.co.nz> wrote:

>On 2018-09-28, etpm@whidbey.com <etpm@whidbey.com> wrote: >> Is this possible? I have a customer, a glass artist, who uses several >> very nice but old glass grinding machines. There are only 4 speeds on >> these machines and he would really like more speeds. He has a newer >> machine with a VFD on it and asked me how he could get the same thing >> on his old machines. I told him he really needs to change motors to 3 >> phase. But he is loathe to do that. I can see why. First of all the >> motors are beautiful. Secondly they are protected from the water that >> splashes on them, being totally enclosed. They also run very smoothly, >> having a run cap and great plain bearings. I would want to keep these >> old machines original too. Anyway, is there any sort of practical way >> to feed a cap run single phase from some sort of variable frequency >> drive? > >Disconnect the capacitor and use three phase drive, > >> Thanks, >> Eric
And how do I use three phase drive on a two phase machine? Really, I have never heard of doing this. I can use a regular three phase output VFD to run a two phase motor? Thanks, Eric