Make your own 3ph Convertor | |
This is a 7HP convertor I made up for running a couple of 3phase mills, it can also be fed into a machine with VFD.
I based my design on the articles by Fitch Williams in the Metalworking.com drop box under the 1998 retired files they are JPG files FRW-1 to 7. And with communication with him over tuning etc.
I elected to go with a totally 240vac control circuit to avoid transformers etc.
A 4pole motor is recommended over a 2 pole, although either will work, the cap sizes will be different. Also it is important that caps Cs,Cp & Pf are AC motor start rated, Cstart can be intermitently rated. I used various 10µfd & 20µfd in parallel during the tuning process.
The start button is pushed only long enough for the motor to come up to a good speed, usually barely a second.
If any one is interested in persuing this I can dig up the original communication tuning notes.
Al
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CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
Last edited by Al_The_Man; 04-24-2005 at 09:12 AM.
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