I have big DC motor what I want to control. It is making 1-2000 rpm and should use max 300V and 50A. At least I think it is so because there are no labels on the motor and almost no information about that working bench.
It is С1Е61А metal lathe using пто-м-230-50-у4 rectifier from 1977. Motori is from ПБСТ family should be Электродвигатель ....кВт ......... об ПБСТ43М ...... В IM1001 unfortunately I don't now exact parametsics. This lathe was produced for military use. There are some info about lather, rectifier and DC motor but no info to all of them together.
Rectifier is using tachogenerator to see motor RPMs, unfortunately tachogenerator is dead and can't repair. Everything in the rectifier box is working but I think it is nonsense to use arduino to make only tachogenerator info for the rectifier. There are to many parts what can die. Here (PDF) are technical sheet for the thyristors (unfortunately they are in Russian)
Backstory It was 1977 when Russians made this metal lathe. I bought it in spring, engine wasn't so powerful as I expected but I thought I can repair it. How hard can it be it is mechanical electronics. My knowledge in electronics isn't so good so I was looking person how know that old electronics. In some point I realised that I have friend who has big knowledge about that. After few days we discovered that someone had made some extra connections to fool rectifier and tachogenerator actually do not work. Unfortunately I haven't found new on, only used ones are in the market and with toes parts are too big risk that they aren’t working properly. So here I am, I think most efficient way to get engine works properly is to use arduino as a brain what are monitoring engine RPMs and giving commands to thyristors and ofcourse potentiometer for speed control.
Just for fun some pictures: