Patent ID: 9543796
Date: 2017-01-10
CPC Classifications: H02K

Claim:
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.