Spindle motor for hard disks with cup-shaped sleeve

A driving device suitable for use in hard disk drives, the driving device comprising:

• a stator comprising a deepened groove, wherein the deepened groove is aligned perpendicular to a fixed axis of the stator;
• a rotor positioned pivotable on the fixed axis of the stator on corresponding bearings;
• a winding packet comprising a laminated core and a corresponding winding fastened on the stator, the laminated core having a radially inwardly directed front side separated from the rotor by an air gap between the rotor and the stator, the radially inwardly directed front side of the laminated core being directed towards a surface of the rotor;
• and
• a holding sleeve disposed partially within the elongate groove of the stator which is formed as a separate component from the stator and which is positioned in the air gap, the holding sleeve concave radially outward from the fixed axis of the stator along the fixed axis of the stator, wherein the holding sleeve has an axial projection and a horizontal radially formed projection positioned so that the winding packet is centered in a transition between the axial projection and the horizontal radially formed projection, the holding sleeve projects beyond the laminated core, and wherein a radial inner surface of the stator core is fitted to a radial outer surface of the holding sleeve.