Just a few comments to see if I'm on the right track here. I'm recycling my first thread because I'm still a grass-green newbie.
First, it seems that the two main obstacles to AC cars are:
- Lack of availability of components, mainly motors and speed controllers.
I've also seen a user or two on multiple forums suggest that, if I can make my own speed controller, then AC could possibly be less expensive than DC. I would like some validation of that.
Doing my own searching on AC parts, it seems that all the companies which are working on production-ready cars in AC are building their own electronics. It also seems that there are almost no suitable motors specifically built for cars, and the ones which are out there are stupendously expensive.
In searching on AC motors, I see all sorts of speed controllers for 3-phase motors, but I don't see any implication that these motors are good for high RPM or high frequency AC. Is this true, or is there an unspoken assumption about the frequencies these motors can handle?
Regarding learning about this stuff, I wonder if it would be appropriate to get an RC model scale motor and controller and mess around with that. In other words, would it be appropriate to get a motor kit from http://www.gobrushless.com/shop/
and try to make a controller for that, and then work up from there?
For that matter, would it be feasible to use a controller for a smaller motor and make an amplifier stage, or does the controller need to have a slower timing for larger motors? Does a large motor controller just supply voltage and monitor current, or does it try to force the current by upping the voltage? Does the mass of the rotor make a difference to the software? The capacitance/inductance?
From the abstract educational sense, I am extremely attracted to getting an embedded controller and writing my own software. In the realistic garage mechanic sense, this scares me badly because I'll spend much more time doing that than converting the whole car.
Thank you for your time.