Hub for flywheel and flywheel for energy storage having same

Abstract

There are provided a hub for a flywheel and an energy storage flywheel. The hub for a flywheel is provided between a rotor and a rotational shaft of a flywheel to allow the rotor to have the same rotation speed as that of the rotational shaft. The hub includes a hollow main dome in which a through hole into which the rotational shaft is inserted is formed in one end and an opening is formed in the other end in a longitudinal direction of the rotational shaft, and that is formed by winding a composite material therearound; and a sub dome that is bonded to the rotor and is formed by winding the composite material around an outer surface of the main dome.

1 . A hub for a flywheel that is provided between a rotor and a rotational shaft of a flywheel to allow the rotor to have the same rotation speed as that of the rotational shaft, the hub comprising:
 a hollow main dome in which a through hole into which the rotational shaft is inserted is formed in one end and an opening is formed in the other end in a longitudinal direction of the rotational shaft, and that is formed by winding a composite material therearound; and   a sub dome that is bonded to the rotor and is formed by winding the composite material around an outer surface of the main dome,   wherein any one of the main dome and the sub dome expands in a radial direction of the rotational shaft along with the rotation of the rotational shaft and the rotor to allow the sub dome and the rotor to be maintained at a bonded state therebetween.   
     
     
         2 . The hub for a flywheel according to  claim 1 ,
 wherein the sub dome includes a first sub dome wound around the outer surface of the main dome and a second sub dome wound around an outer surface of the first sub dome, and   the main dome, the first sub dome and the second sub dome have different winding angles from each other.   
     
     
         3 . The hub for a flywheel according to  claim 2 , wherein the first sub dome has a winding angle smaller than that of the main dome, and the second sub dome has a winding angle smaller than that of the first sub dome. 
     
     
         4 . The hub for a flywheel according to  claim 3 , wherein a winding thickness of the main dome is thinner than that of the first sub dome and is thicker than that of the second sub dome. 
     
     
         5 . The hub for a flywheel according to  claim 2 , wherein the first sub dome has a winding start position different from that of the second sub dome with respect to the outer surface of the main dome. 
     
     
         6 . The hub for a flywheel according to  claim 5 , wherein the winding start position of the first sub dome is close to the through hole than the winding start position of the second sub dome. 
     
     
         7 . The hub for a flywheel according to  claim 5 , wherein the winding start position of the first sub dome is located at an outer surface of a cone-shaped portion of the main dome. 
     
     
         8 . The hub for a flywheel according to  claim 5 , wherein a winding thickness of the main dome near the through hole is thicker than a winding thickness of the main dome near the opening. 
     
     
         9 . An energy storage flywheel, comprising:
 a rotor that stores rotational motion energy as inertial energy and is formed by winding a composite material in multi layers therearound;   a rotational shaft that is arranged to penetrate through an inner side of a hollow portion formed in the rotor; and   a hub that is provided between the hollow portion of the rotor and the rotational shaft to connect the rotational shaft and the rotor, and compensates a shape change of the rotor when the rotor is rotated,   wherein the hub includes a hollow main dome in which a through hole into which the rotational shaft is inserted is formed in one end and an opening is formed in the other end and is formed by winding the composite material therearound, and a sub dome that is bonded to the rotor and is formed by winding the composite material around an outer surface of the main dome.   
     
     
         10 . The energy storage flywheel according to  claim 9 ,
 wherein the sub dome includes a first sub dome wound around the outer surface of the main dome and a second sub dome wound around an outer surface of the first sub dome, and   the first sub dome has a winding angle smaller than that of the main dome, and the second sub dome has a winding angle smaller than that of the first sub dome.   
     
     
         11 . The energy storage flywheel according to  claim 10 , wherein the first sub dome has a winding start position different from that of the second sub dome with respect to the outer surface of the main dome. 
     
     
         12 . The energy storage flywheel according to  claim 11 , wherein a winding start position of the first sub dome is close to the through hole than a winding start position of the second sub dome. 
     
     
         13 . The energy storage flywheel according to  claim 9 , wherein the hub is provided by at least two in multi layers in a longitudinal direction of the rotational shaft. 
     
     
         14 . The energy storage flywheel according to  claim 13 , wherein a bonded state between the hub and the rotor is maintained during the rotation by winding the composite material in multiple layers therearound so as to be expandable in a radial direction of the rotational shaft.