Motor with stepped rotor tube coupled to the inner race of a multiple-row bearing

摘要

A motor includes a stator, a rotor tube which is disposed inside the stator, a rotor core assembly which is coupled to an outer circumferential surface of the rotor tube, and a shaft which is coupled in the rotor tube. The rotor tube is divided into at least two stepped regions having different diameters. A multiple-row bearing has an inner wheel coupled to an outer circumferential surface of any one of the at least two stepped regions, and rotatably supports the rotor tube. Such a configuration ensures structural stability of the motor and minimizes a space occupied by a bearing.

主权项

1. A motor comprising:
a stator; a rotor tube which is disposed inside the stator; a rotor core assembly which is coupled to an outer circumferential surface of the rotor tube; and a shaft which is coupled in the rotor tube, wherein the rotor tube is divided into at least two stepped regions having different diameters, and includes a multiple-row bearing which has an inner wheel coupled to an outer circumferential surface of any one of the at least two stepped regions, and rotatably supports the rotor tube, wherein diameters of the at least two stepped regions are decreased in a stepwise manner toward a lower end thereof, wherein the inner wheel of the multiple-row bearing is coupled to an outer circumferential surface of a lower stepped region of the stepped regions, and wherein an upper surface of the inner wheel of the multiple-row bearing supports a stepped portion of the lower stepped region.