When using induction motors, we can scale down the physical size by increasing the rated frequency. Take for instance this 200hp 60HZ induction motor at 2127lbs, vs this 200hp 400hz induction motor at 85lbs. So for weight sensitive applications like aeronautics or EVs, the 400hz motor is the clear winner.
But what if we want to use a separately excited would field DC motor? We have no recourse to downsize the motor by anywhere near the same degree.
But what if we want to use a separately excited would field DC motor? We have no recourse to downsize the motor by anywhere near the same degree.