Abstract: The method makes possible experimentation on reduced scale models, more especially in non-stationary operating conditions, of the rotor of rotary electrical machines respecting the physical conditions which ensure in the rotor under test a simultaneous similitude for the electromagnetic, thermal and mechanical phenomena. The contradiction which appears in the reduction of the electromagnetic forces and of the inertial forces is removed by modifying the stator of the reduced scale model so as to produce in the rotor a correct evolution of the rotor frequencies. The method is useful for testing rotors of very high power electrical machines.

Abstract: A wheel structure such as a flywheel with hub and rim adapted for use at high angular velocities including a strong, compact and perfectly balanced coiling formed by a radiating winding of at least two cables linking the wheel hub to the wheel rim and enveloping the rim. Also the method of manufacturing of the wheel structure by winding of the cables between the wheel hub and wheel rim by cables continuously dispensed under constant tension looped around the wheel rim.