Abstract: A flywheel energy storage device includes a housing, a flywheel rotor, a first bearing, a second bearing and a limit assembly. The housing defines an installation chamber. The flywheel rotor is arranged in the installation chamber and rotatable in the installation chamber. The flywheel rotor includes a rotor portion, a first shaft portion and a second shaft portion. The first shaft portion is positioned at one side of the rotor portion, and the second shaft portion is positioned at another side of the rotor portion. The first bearing is arranged to surround an outer circumference of the first shaft portion; and the second bearing is arranged to surround an outer circumference of the second shaft portion. The limit assembly is arranged at an end of the first shaft portion or an end of the second shaft portion.

Abstract: An energy storage flywheel includes a housing; a flywheel rotor arranged in the housing and connected, at an upper end, to a self-bearing motor; a bearing rotor fitted over a lower end of the flywheel rotor and provided, at a lower end, with an annular rotor magnetic steel; and a bearing stator a arranged below the bearing rotor and provided with a cavity which opens towards the bearing rotor, in which the lower end of the bearing rotor is fitted, and at a circumferential surface of which is provided with an annular stator magnetic steel. At least part of the annular stator magnetic steel is opposite to and below the annular rotor magnetic steel in an up-and-down direction and is opposite to the annular rotor magnetic steel in a radial direction of the bearing rotor; and the annular stator magnetic steel and the annular rotor magnetic steel repel each other.

Abstract: A flywheel energy storage device includes a housing, a flywheel rotor, a first bearing, a second bearing and a limit assembly. The housing defines an installation chamber. The flywheel rotor is arranged in the installation chamber and rotatable in the installation chamber. The flywheel rotor includes a rotor portion, a first shaft portion and a second shaft portion. The first shaft portion is positioned at one side of the rotor portion, and the second shaft portion is positioned at another side of the rotor portion. The first bearing is arranged to surround an outer circumference of the first shaft portion; and the second bearing is arranged to surround an outer circumference of the second shaft portion. The limit assembly is arranged at an end of the first shaft portion or an end of the second shaft portion.

Abstract: An energy storage flywheel includes a housing; a flywheel rotor arranged in the housing and connected, at an upper end, to a self-bearing motor; a bearing rotor fitted over a lower end of the flywheel rotor and provided, at a lower end, with an annular rotor magnetic steel; and a bearing stator a arranged below the bearing rotor and provided with a cavity which opens towards the bearing rotor, in which the lower end of the bearing rotor is fitted, and at a circumferential surface of which is provided with an annular stator magnetic steel. At least part of the annular stator magnetic steel is opposite to and below the annular rotor magnetic steel in an up-and-down direction and is opposite to the annular rotor magnetic steel in a radial direction of the bearing rotor; and the annular stator magnetic steel and the annular rotor magnetic steel repel each other.