a mass magnifier is created by combining the properties of permanent magnets or electromagnets with the property of mu - metal to create a novel energy storage device . in a system mu - metal is placed in the magnetic field created by a magnet or electromagnetic in a manner to provide an energy storage device , similar to a fly wheel . the system includes a set of magnets arranged in a circle around a cylinder in a stationary position , effectively forming a stator . another set of opposing magnets are arranged to form a rotor . when the rotor is rotated , mu - metal material is inserted between the rotor and stator magnets in a manner so that the rotor will remain in motion in a desired rotation direction , even if an opposing force is applied to the rotor axle . the system , thus , forms an energy storage device similar to a fly wheel . the system can also provide energy storage for conventional machines or for smaller micro - technology or nano - technology type devices .