data to follow:<br /><br />Rotary converter made with a Heemaf 3Ø 5HP motor rated for 220 / 380 Volts.<br />The supply is 230 Volts 20 Ampères single phase.<br /><br />Normally a 3 phase motor is started up in star, when up to speed it is switched to delta.<br /><br />I reverse engineered the concept of that with a lower 230 Volts voltage to "generate" a higher 400 Volts voltage should be possible, which I prove here with this set up.<br /><br />Starting the motor in delta with the start capacitors, then switch over to star and energizing one winding with 230 Volts. An excitation capacitor is required to make the 3 phase field while in star( the 8uF 660Volts Siemens Cap)<br />The motor will stabilize it at around 380 - 400 Volts.<br />The neutral has to be switched over to the star point otherwise the motor will brake.<br />An extra pole is required on the delta relay to achieve this.<br /><br />The opposite is possible too although I have not tried it out is to start the motor in 230V delta, then switch to star and apply the 230 Volts across the star winding.<br />In this case 127 / 220 Volts 3 phase can be achieved as well.<br /><br />18 Dec 2010 Crawling is a running state of the motor, that the motor runs at 1/7 of nominal speed and remains running with excess current flow in the windings and can't get itself in correct synch with the mains.
