For the motor: A lot more insulation on the coil windings mostly. Higher voltage usually means less copper needed and more insulation. Boosting voltage from bat

For the motor: A lot more insulation on the coil windings mostly. Higher voltage usually means less copper needed and more insulation. Boosting voltage from batteries is pretty easy. Either using a transformer on the motor controller or putting enough cells in series to get the voltage you want. There are also methods using inductors and PWM to get a boosted voltage. 750 volts is actually fairly low. Siemens makes some 3-6 kilovolt HV motors. https://hv-easy.azurewebsites.net/ https://hv-easy.azurewebsites.net/