Billy, a buck-boost regulator setup works if you can get a loop of wire around a ferrite core. It is quite lightweight and convenient for many setups. A hobbyist typically loops a few turns around a ferrite toroid form. However, you don't need that. All you need is for the motor to run at a much lower voltage than the capacitors are charged to, and use a suitable controller. The controller chops the voltage down. There is indeed a power factor problem using a chopped DC supply with any motor, too, so an intelligent controller has to account for that. These days a 12 dollar chip suitable for such uses has eight 80 MIPS cores in a 40 pin package, so even a ridiculous amount of overkill is cheap. Buck-boost regulation lets you supply a higher current at a lower voltage, too. But it's not nearly as heavy or expensive as a transformer. It's basically a choke coil and some kind of controller. When you Google "buck-boost regulator" you find out that there are dedicated chips on the market for many applications. One application sucks a battery dry to supply LED flashlights. It would be very similar, just souped up a bit, for an electric motor.