What are the ways to move 50 kg?
Im presuming youre using the term electromotor to describe a typical electric motor - a closed (self-contained) device that uses a stator and rotor, one or both containing coils of wire such that alternating magnetic fields in the rotor or stator cause the rotor to rotate. This turns the shaft which is mechanically coupled to provide useful work. But we can do other things with electricity, such as use it to heat a coil of wire, create acoustic pressure (sound) waves, generate wind electrostatically, etc. Google railgun and maglev for more ideas.