Single phase motor on 3 phase power

[Brian.Evans]

Well, I have found two motors locally:
Both 1800 rpm and 2hp and 3ph.

One is brand new and is $195

One is a 1986 Baldor used at $125.

What do you guys think?

 

[PT Doc]

Well, I have found two motors locally:
Both 1800 rpm and 2hp and 3ph.

One is brand new and is $195

One is a 1986 Baldor used at $125.

What do you guys think?

To give you a frame of reference, I bought a 3 hp 3 phase new Baldor 1750 rpm for 250. Likely could have gotten it cheaper. What brand is the other motor? I'd pass on the 26 year old Baldor.

 

[ron_m80]

Correct me if I'm wrong, but I thought this is pretty much what a rotary phase converter is?

If i had read “rotary phase converter“ i might have made that corelation. I only know something like that as a motor generator set.

I do know of someone that created a third phase leg using a capasitor bank, i think it was the capasitor time constant that created a third phase at 60hz. I dont profess to know the details of it though.

 

[ron_m80]

I would also add gentlemen, with regard to shop overhead; You do not want to run anymore horsepower in a motor than you need to. It literally pays to google horsepower calculations, adjust and change capacitors and or add them where they are missing, and using a 1 hp instead of a 2 hp, is the better choice if you have options and the patience to look it up.