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raitl said:actually my goal is to run a small 220V AC motor off a 12V battery. 220V to 12V calculations I can handle, it's the AC to DC part I'm puzzled with.
Nigel Goodwin said:But as you're starting from 12V anyway, you have to convert to AC to get to 220V - so leave the 220V as AC instead of rectifying it!.
raitl said:Risking to make myself look even more stupid....what exactly is the major difference? I mean, there are DC motors that aren't permanent magnet ones, right? So basically it should be just the manner the coils are connected... or am I way off here?
raitl said:The motor in question is an electrical grass trimmer motor which I'm trying to convert into a small boat motor. (Talking about a light ply boat, for 2-3 ppl)
raitl said:ok, turns out it's a motor that will run both on AC or DC. But also turns out that the Ohms law doesn't work when trying to calculate the resistance of motor stator and rotor windings... how DO you actually calculate the resistance, when you know power(P) and voltage(U)?
220*220/200=242 whereas the actual resistance of the entire motor is 80 ohms.
I want to know what should the resistance be, to run the motor on 12V