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Without magnets it ran for just over 6 minutes letting it go at the same place (touching a board) so i'm assuming the drag on the coils/magnets took energy.Still its one of the first I had and I have quite a few more, I just need to work on a few parts. Thinking about one earlyer gave me a way to maybe improve on the design but im sticking with the simplest version first.
Sorry for offtopic but I need help.I have a few such heaters from old electric kettles : https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcTVpAb-1hcRDM2tOPXCpM4WrCSsLaHohETvGA_4uzYS7O-XcogBhAI measured they have 26 ohm resistance and 90uH inductance. They are rated at 230V AC 2000W eachHow can I compute heat dissipation of this heater for various AC frequencies ? I'd like to power them from high frequency inverter without having to store energy in bi capacitor and converting into 50Hz AC, but I couldn't find any article about behaviour of nichrome wire in inductive coil arragement at high frequency.MarkE , can you help ? I think it's very interesting topic.
MarkECan you explain how you get the formula for apparent power PAPPARENT52.9E3 V2/Z. What does 52.9E^3 factor mean ?How did you got that nice graph ?
As you posted for example at 46,9khz 1000W of power is dissipated on this heater. Is there any energy dissipated at this frequency by inductance magnetic field ?