MOTOR

摘要

A motor includes a rotating portion. The rotating portion includes a shaft, a rotor hub, and a flywheel. The rotor hub is arranged to extend in an annular shape around the shaft. The flywheel is arranged axially above the rotor hub. The rotor hub includes a joining portion fixed to an outer circumferential surface of the shaft. A center of gravity of the rotating portion and the joining portion of the rotor hub are arranged to radially overlap with each other. The center of gravity of the rotating portion is arranged axially above a radial bearing portion and at a level equivalent to the level of the joining portion.

主权项

1. A motor comprising:
a stationary portion; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion; wherein the rotating portion includes:
a shaft arranged to extend along the central axis;a rotor hub arranged to extend in an annular shape around the shaft; anda flywheel arranged axially above the rotor hub; the stationary portion includes a sleeve arranged to rotatably support the shaft; the motor further comprises a radial bearing portion where the sleeve and the shaft are arranged radially opposite to each other with a lubricating oil arranged therebetween; the rotor hub includes a joining portion fixed to an outer circumferential surface of the shaft axially above the radial bearing portion; and a center of gravity of the rotating portion and the joining portion are arranged to radially overlap with each other.