Originally Posted by EVfun
But can you find a single phase AC motor with anywhere near the peak power required for an on-road EV?
single phase AC motors are no option.
They have near-to-none starting couple while using up to 30 times nominal amperage until at their top-speed.
You should use triphase motors that are dumped 100 a day by industry so can be found on any scrapyard is all (k) wattages and speeds.
Next thing is to convert DC to triphase AC.
Inverter motor controllers (also industry standard, and easily obtained on ebay etc at reasonable prices) can be fed by DC
simply multiply the input voltage with 2 sqrt (roughly 1,4) and you have the required voltage.
So 110 v AC gives 162 DC volts.
Inverter motor controllers come in single-phase in / three-phase out that are rather popular.
They exist in up to 3 kw /220-240 volt in and >500 kw in threephase.
For more power you have to get three phase in/out types. These can be DC powered too, by paralleling the phases.
(first stage of any inverter controller rectifies the AC so phase is no issue, but you should check wit the manufacturer if this can be done without triggering some safety)
Yet the drawback is the high battery voltage but, as our soccer-idol Johan Cruyff says: "every disadvantage has itīs advantage" : you save many kiloīs of copper wiring and you might get a nice deal on small standard AGM batteries.
Finally,if you want to dig into it, most inverter controllers can do DC braking wich can be used to convert braking energy into battery power (instead of useless heat on your brakes).
But I must honestly say that all I state here remains theory for me.
I have lots of plans but all reside on paper until now.