Motor

A motor comprising:

• (a) a rotor including a front ball bearing and a rear ball bearing both being fixed to a motor shaft;
• (b) a stator including a front bracket and a rear bracket, the front ball bearing being positioned in a front bearing housing of the front bracket, and the rear ball bearing being positioned in a rear bearing housing of the rear bracket;
• (c) a bearing shim;
• (d) a cup ring having a flange section and a tube section, the cup ring being provided at least partially within the front bearing housing such that the flange section is in contact with a surface of the front bracket, and an end portion of the tube section in contact with a first end face of an outer ring of the front ball bearing via said bearing shim;
• (e) a holding plate in contact with a second end face of the outer ring of the front ball bearing, and
• (f) at least one fastener coupling either said flange section to said front bracket or said front bracket to said holding plate, such that the cup ring and said holding plate are provided on opposite sides of the front bracket, thereby holding the outer ring of the front bearing between the cup ring and said holding plate.
• said bearing shim being provided between the end portion of the tube section and the first end face of the outer ring of the front ball bearing, said at least one fastener being tightened such that a distance between the end portion of the tube section and the first end face of the outer ring of the front ball bearing is less than or equal to 0.1 mm.