It could still be brushless with only two wires, as it could have an internal controller. THere's a few radiator fan motors I've run across like that, though i don't have any of them. If it *is* brushless with internal controller, then to run above maybe 15V you'll probably have to use an external controller or modify the internal one for higher voltage (and do some cooling mods).
If it's brushed, it could be run directly on at least twice it's original voltage, and possibly many times that, as I did with some brushed axial-flux four-pole radiator fan motors for my first friction drive, and with some power chair motors on my first middrive.
I would bet on the output being a planetary gearbox, rather like a typical cordless screwdriver. Possibly multistage. It's about the right size for some of the Matex planetary modules like the ones used in some of the Currie drives, and even the metal color on the splined shaft is similar to that of the Matex planetaries I have here; Matex makes a number of modules that can all interconnect with various standard hardware they make, too.
I hate to imagine the carnage for a torquey drive like power steering on a car depending on a sintered-metal shaft, so my bet is that it is not that, just that the color and sheen resembles it.
I dont' know if it is going to be capable of continous operation at high power levels, becuase in use in a car it would probably not be operating like that, and so probably isn't designed around high duty cycle usage. Might overheat using it as an ebike motor. STill, it would be interesting to try it. I'd do it as a thru-the-BB type drive, or a jackshaft drive like my old CrazyBIke2 powerchair motor setup was. Just watch the temperature inside it.
I wish it wouldn't cost a fortune to ship them; I can think of several possibilities for experiments with them as essentially giant servo motors, as well as possibly traction motors.
