Abstract: A driving head for the numerically controlled setting movements of a tool spindle or workpiece table around at least one axis of rotation. The basic structure of the driving head comprises a housing (1, 1′) and at least one multi-pole external rotor motor (2) arranged concentrically in relation to the axis of rotation (A, B). The rotor motor is comprised of a ring-shaped, soft-magnetic stator (3) with single-pole windings, which is inserted in the housing (1, 1′); as well as a ring-shaped rotor yoke (5) fitted with permanent magnets (4) On the end side, the rotor yoke (5) is connected to a rotor body (6), which is rotatably supported in the housing (1, 1′). Furthermore, the rotor yoke is arranged between the stator (3) and a segment of the housing that comprises a device (7) for blocking the rotor yoke (5). The device (7) for blocking the rotor yoke preferably consists of a deformable diaphragm (8) acted upon by fluid and placed against the rotor yoke (5) under the pressure of the fluid.

Abstract: A driving head for the numerically controlled setting movements of a tool spindle or workpiece table around at least one axis of rotation. The basic structure of the driving head comprises a housing (1, 1′) and at least one multi-pole external rotor motor (2) arranged concentrically in relation to the axis of rotation (A, B). The rotor motor is comprised of a ring-shaped, soft-magnetic stator (3) with single-pole windings, which is inserted in the housing (1, 1′); as well as a ring-shaped rotor yoke (5) fitted with permanent magnets (4) On the end side, the rotor yoke (5) is connected to a rotor body (6), which is rotatably supported in the housing (1, 1′). Furthermore, the rotor yoke is arranged between the stator (3) and a segment of the housing that comprises a device (7) for blocking the rotor yoke (5). The device (7) for blocking the rotor yoke preferably consists of a deformable diaphragm (8) acted upon by fluid and placed against the rotor yoke (5) under the pressure of the fluid.