D
Dave Milosevich
Guest
With the increased interest in buying one's own machine tools, the issue of three phase power comes up more frequently.
It's no big deal. There are several ways to satisfy the three phase requirement, none of which include the power company. It is highly unlikely that you will be able to get your electric utility to supply three phase power to your house if you do not live in an area zoned for industrial or heavy agricultural (read irrigation) use. Even where it is possible it is expensive.
Variable frequency drives are the slickest, most cost efficient way to go for motors up to 3 horsepower. You can buy them off the internet from any number of suppliers. Above 3HP, they get real expensive real fast.
The cheapest, off-the-shelf solution is a "solid state converter". This is not really a converter but simply a starter that gets your three phase motor spinning on single phase power where it will continue to happily run as long as you don't need it to produce more than half its rated power. That is to say, your 5 HP motor is only going to be good for 2.5 HP in this arrangement. I used one for years on a 7.5 HP motor and it worked fine. There is no gunsmithing requirement for much horsepower.
The easiest home-made solution is a rotary converter. These are also available off-the-shelf but are easy to fabricate. It is not a motor generator per-se. It is a three phase motor that is connected to single phase power and started by either a solid state converter or mechanical means like a small single phase motor or even a pull-rope. The cost is driven by how much you have to pay for a three phase motor which can be used or new.
Here's a link to get you going.
http://www.metalwebnews.com/howto/ph-conv/ph-conv.html
Also, Google up "three phase converter" and you will get a bunch of hits for sales and making your own.
FWIW
It's no big deal. There are several ways to satisfy the three phase requirement, none of which include the power company. It is highly unlikely that you will be able to get your electric utility to supply three phase power to your house if you do not live in an area zoned for industrial or heavy agricultural (read irrigation) use. Even where it is possible it is expensive.
Variable frequency drives are the slickest, most cost efficient way to go for motors up to 3 horsepower. You can buy them off the internet from any number of suppliers. Above 3HP, they get real expensive real fast.
The cheapest, off-the-shelf solution is a "solid state converter". This is not really a converter but simply a starter that gets your three phase motor spinning on single phase power where it will continue to happily run as long as you don't need it to produce more than half its rated power. That is to say, your 5 HP motor is only going to be good for 2.5 HP in this arrangement. I used one for years on a 7.5 HP motor and it worked fine. There is no gunsmithing requirement for much horsepower.
The easiest home-made solution is a rotary converter. These are also available off-the-shelf but are easy to fabricate. It is not a motor generator per-se. It is a three phase motor that is connected to single phase power and started by either a solid state converter or mechanical means like a small single phase motor or even a pull-rope. The cost is driven by how much you have to pay for a three phase motor which can be used or new.
Here's a link to get you going.
http://www.metalwebnews.com/howto/ph-conv/ph-conv.html
Also, Google up "three phase converter" and you will get a bunch of hits for sales and making your own.
FWIW