The invention solves the issue of cooling of the power generator by change of its body. According to the invention the generator has a body in the form of open frame structure with polygonal base, made preferably of hollow profiles, connected removably with a clamp, where first stator segments are mounted on threaded pins, connected removably to the arms of the base and arms of the clamp, set on a circle larger than the diameter of a first rotor plate and further rotor plates.