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I have had this problem many years ago on induction generators (before inverters & soft starters were available) There is a possibility that the star contactor will burn out if it is not properly rated. It should be the same size as the line contactor & both should be rated for Locked Rotor Star...

Here is a simple equation which works for most slipring motors: RV=(HP*470)/RA Regards Fintan

Hi fbjaviour There was a system similar to this which was invented by a Russian. A similar system is marketed by a company Magnastart. SCR systems are marketed by a number of companies. The most common & simplest system of stepless acceleration & speed regulation for wound rotor motors is the...