12-02-2014, 11:13 AM
Hi,
Most interesting David; I've finally had a look at the links you kindly supplied.
It shows what can be achieved Colin through desperation; thanks for sharing your story.
Sounds like you made a "Rotary converter" Alan D? These work but are expensive because the idler motor really needs to be much bigger than the motor being used? I've mentioned this previously; A guy in Wales wanted to power two big heat exchangers (30hp) to his two farmhouses and having been quoted over £17,000 to have 3 phase 415V laid on; he contacted Doug at "unique3phase" and Doug in turn put the guy in touch with me. I suggested he wind a big transformer using Doug's transformer method which I had already done but instead he went the rotary converter way. The rotary converter proved so noisy in operation it was keeping the family awake at night and once again this guy contacted me asking for advice. I suggested he build a dedicated out-building to house the converter but have since not heard from him.
My home made 3 phase transformer continues to work very well and at idle only ticks over at 0.8A which disappears once it is loaded. It gives full power to the motor and has always impressed visitors whom I've demonstrated it to.
I converted my big Startrite combination woodworking machine using a start and run capacitor allowing it to run from 240V single phase; this machine has three 3hp 3 phase motors installed and because all motors are identical in size I got away by using a single start and single run capacitor connecting each in such a way that the switching diverted these to the required motor; this was over twelve years ago and the machine is still reliable having the same capacitors still installed so they have held up well for a long time.
I'm not electrically trained but I did find this work most interesting.
Kind regards, Col.
Most interesting David; I've finally had a look at the links you kindly supplied.
It shows what can be achieved Colin through desperation; thanks for sharing your story.
Sounds like you made a "Rotary converter" Alan D? These work but are expensive because the idler motor really needs to be much bigger than the motor being used? I've mentioned this previously; A guy in Wales wanted to power two big heat exchangers (30hp) to his two farmhouses and having been quoted over £17,000 to have 3 phase 415V laid on; he contacted Doug at "unique3phase" and Doug in turn put the guy in touch with me. I suggested he wind a big transformer using Doug's transformer method which I had already done but instead he went the rotary converter way. The rotary converter proved so noisy in operation it was keeping the family awake at night and once again this guy contacted me asking for advice. I suggested he build a dedicated out-building to house the converter but have since not heard from him.
My home made 3 phase transformer continues to work very well and at idle only ticks over at 0.8A which disappears once it is loaded. It gives full power to the motor and has always impressed visitors whom I've demonstrated it to.
I converted my big Startrite combination woodworking machine using a start and run capacitor allowing it to run from 240V single phase; this machine has three 3hp 3 phase motors installed and because all motors are identical in size I got away by using a single start and single run capacitor connecting each in such a way that the switching diverted these to the required motor; this was over twelve years ago and the machine is still reliable having the same capacitors still installed so they have held up well for a long time.
I'm not electrically trained but I did find this work most interesting.
Kind regards, Col.
Happiness is a wreck of a cabinet to restore.
