Time for a new Warpinverter build

Author	Message
rogerdw Guru Joined: 22/10/2019 Location: Australia Posts: 955	Posted: 11:37am 13 Mar 2021         Warpspeed said   There is no simple correct answer to that. I suppose it depends on the temperature ratings of the wire, and any other insulation. The very best grades of wire can be rated up to 200 Celsius absolute maximum. The hottest part (hot spot) will be buried inside the windings, and can run a lot hotter than surface temperature. I suppose if it feels too hot, and there are hot smells, that is probably getting pretty close to what I would consider acceptable, but that is just my own rather conservative opinion. Thanks Tony. I am definitely not one to explore the limits with overloading equipment  ...  it was only when I was asking advice of a 3-D printing expert about the possibility of printing the spacers  ...   ...  and of course his first question was just how hot the transformer would ever run because most filaments are fairly low melting point  ...  and the better materials really need a professional machine to successfully print them without warping etc. From the transformer labels I showed on page 5, we see they are " Class B". The only temperature class table I could find showed Class B as good for 130 degrees C and an 80 degree temp rise. https://sound-au.com/xfmr2.htm#s115   Quote   If you stick with the recommended current density in the wire of four amps per mm square, that will run continuously like that without excessive temperature rise, and at considerably more for short bursts. So once you have worked out your wire sizes that will fit the core, the current density figure x mm sq x voltage will give you a nice conservative transformer power rating. Yeah, well I don't know enough to question and was very happy to have taken your advice on all those things anyway.   I will definitely be monitoring temperatures very closely and can see the value of a powerful fan setup like you have. At least then if temps do start rising uncomfortably I can hit it hard to try and keep it down. The further I get into all this, I can see it is more of an art than a science.