Replies

1. 
   rslatm | Oct 31, 2002 12:42am | #1

   I've been using static, rorary and inverter types  with 3 phase machines for over 17 years. They work great but it all depends on the particular application. You can run a whole shop or just one machine.  What would be your application? Sometimes it's much cheaper  swapping the motor and sometimes it's not an option. With an inverter I can turn a step pulley speed change to infinitely variable speed with a dial. Also depends on if you plan to add more machines then you want a rotary.  Too many variables to give an easy answer.

   Rick

1. 
   Timberwerks | Oct 31, 2002 12:50am | #2

   Rick

   This would be for one machine only. A 7hp bandsaw I am told rotary is a better choice. What are you thoughts?

   Dale

1. 
   rslatm | Oct 31, 2002 02:38am | #3

   In that case I agree with the rotary. A static only starts the motor and drops out. That's why they only give 1/2 to 2/3's power. You are only using 2 0f the 3 legs. A static might even be ok as long as you well over powered. I set up a 2 hp stroke sander with a static and occassionally we would bog it down. A rotarty will give full power. You can make a rotary using a static and a slave motor. You don't even need the static in a sense. You could use a 1/4 hp motor to get the slave going then put power to the slave and disengage the 1/4 hp. I usually get phase-a-matic converters from Enco. Phase-a-matic has provided good technical suppport on my applications. I'm no electrician but I've been doing basic stuff long enough and I use support of my local motor shop, electricians and suppliers to make it all work. I would get a static and see if you can get a three phase motor for a slave. Actaully sometimes in the classified you might find a rotary cheap enough. An inverter will give variable speed but for that hp it's pretty pricey unless. I'd call phase-a-matic and talk to your local motor shop for their take. Some of these bandsaws are direct drive and to put a single phase motor on will cost far more than a phase converter. There's at least a dozen converter companies out there. Ronk, Kay etc.

   Rick

1. 
   Timberwerks | Oct 31, 2002 03:55am | #4

   Thanks Rick

   Eventhough I just need it for one machine, it looks like it would be a good idea to consider future equipment. I was visiting the site for Kay industries and was thinking of new possibilities.

   Dale