Patent ID: 7768176

Claim:
A power storage system which transmits power to and from a vehicle driving system the system comprising: a vehicle driving system comprising at least one electric apparatus, a power storage coupled to the electric apparatus and having a stator-provided winding and at least one rotor provided with a magnetic-flux generating device, said rotor being connected to at least one flywheel intended for storage of energy in the form of kinetic energy in at least one rotary mass, said power storage being arranged to transmit power to and from said electric apparatus, wherein said stator comprises at least a first winding arranged to transmit power to and from the electric apparatus at a voltage that is in the interval of 6 to 50 volts as well as a second winding arranged to transmit power to and from the electric apparatus at a voltage that is in the interval of 1 to 24 kV, said first and second windings being arranged to operate independently of each other, wherein at least one of said windings comprises a conductor surrounded by a first semiconducting layer, said first semiconducting layer is then surrounded by a layer of fixed insulation, said first layer of fixed insulation is then surrounded by a second semiconducting layer wherein said rotor comprises a first core, a second core as well as a third core, the first winding of the stator being arranged between said first and said second core and the second winding of the stator being arranged between said second and said third core.