3 phase with idler and draw string only

[gtslabs]

I made 3 phase power today using a 220 single phase source and an idler 3 phase motor only.
This is very rudimentary but worked to a point. I connected each 110 leg of the 220 source
to an push button switch box. Coming out of the switch box I had connected to my idler 3 phase motor. With the switch off, I wrapped a draw cord around the idler motor pulley and gave it a good spin. As it was spinning I switched on the 220 power. The motor operated normally!. I checked voltage and frequency between each lead and had 220v and 60 Hz. My idler is a 1730 rpm 3/4 hp. I was amazed that it took very little effort to get that idler moving.

Now I just unloaded my Bridgeport yesterday. It is a1 hp 3 phase 1725 rpm motor. I tapped of the 3 leads from the motor for my mill. It is wired for 230 currently. The spindle turned fine. It also turned in reverse too. However after about 10 seconds my push button switch box kicked off. I assume there was a thermal overload because I could not reset the switch for about 20 seconds.

I have not yet measured the amps yet, but my spindle is running without load. This is all temporary
wiring but what could the problem be? Do I need a idler motor that is a higher hp rating than my 1hp mill? There is about a 1/4 hp deficiency in the idler but both are rated at the same rpm ~ 1725.

Is this application consider Static or Rotary conversion? And will I get a reduction in power as I have read about Static Converters.

[Al_The_Man]

I built my 7hp 3ph rotary converter some time ago from info in the metal working drop box. http://www.metalworking.com/dropbox/
You can build it to be self starting (no pull cord) and adjust the correct phase angle/power factor by fitting tuning capacitors. Which I think is your problem.
The motor you are using is on the small side, 3/4 hp.
If I can't find the information I used to build mine I will post it , as it may be in the old files in the drop box.
Al

[gtslabs]

I replaced the pushbutton switch with a bus type switch and it worked fine.
I monitored my amps under load and they never exceded 4.7 while cutting 3/8" soft steel.