>>1612058

>Will the core accept more copper (both in terms of space available and saturation flux)?

I haven't disassemble the thing yet (since I can't find fucking torx with a hole anywhere), but judging from pics from internet looks like I can add couple turns no problem.

Saturation flux - I don't know. Is there any formula that will allow me to calculate it, knowing geometry (cross section) and material?

Also, I don't know much about transformers and motors, but I wound couple transformers in the past using this formula S=1.2 sqrt(P), where S is section of iron core (cm), and P is power, but I think it is very very approximate thing, which is only valid for 50 Hz 220V mains. Shit worked fine though.

>Flux is proportional to turns and current

Right. Either you increase current (which is problematic, since battery trips at 25A, which is already too much for this motor, which was designed only for 15A), either increase number of turns (which is also pain in the ass, but at least copper is cheaper than batteries and new controller).

>so using fewer turns of thicker wire (or more turns of thinner wire) doesn't change anything (double the turns, half the cross-sectional area of the wire => half the current, double the resistance, same flux, same voltage drop from resistance, half the I^2R losses). Although inductance increases with the square of the number of turns, so you need a higher voltage for a given speed in spite of the lower current.

Yes. I give zero fuck about speed (actually no, but I may trade 5-7 km/h from top speed).

So, what should I read, so I can increase number of turns knowing what I'm doing?

Can I 2-3 solid thick wires instead of 6-8 thin wires?