Abstract: The invention relates to a device (1) for cooling an electrical machine, in particular an electric motor, the electrical machine having a stator (3) with a stator core (31) and a rotor (4) having a rotor core (41) resting on a rotor shaft (5). Coil windings with axially protruding winding heads (6) are introduced in the stator core (31). According to the invention, the device has at least one cap ring (7) which can be cooled and through which the rotor shaft (5) is guided, the cap ring (7) which can be cooled taking up at least part of an annular intermediate space (ZR) which is in the axial region (BW) of a protruding winding head (6) and the rotor shaft (5). The invention relates to an electrical machine, in particular an asynchronous or synchronous motor, having such a cooling device.

Abstract: Manufacturing costs of releasable permanent magnet rotors or asynchronous squirrel cages should be reduced. Accordingly, a rotor is proposed which includes at least one ring-shaped fastening device (23) secured in fixed rotative engagement to one of the end faces of a magnet device (21, 22) and for form-fitting or force-locking connection to a shaft (25). This makes it possible to eliminate the need for a special bearing sleeve, and the laminated armature core (21) can be provided with a larger axial hole diameter. As a result, the minimum joint pressure can be reduced so that deformations of the spindle and complicated refinishing processes can be avoided. In addition, less stringent manufacturing tolerances of the spindle (25) can be selected.

Abstract: The invention relates to a device (1) for cooling an electrical machine, in particular an electric motor, the electrical machine having a stator (3) with a stator core (31) and a rotor (4) having a rotor core (41) resting on a rotor shaft (5). Coil windings with axially protruding winding heads (6) are introduced in the stator core (31). According to the invention, the device has at least one cap ring (7) which can be cooled and through which the rotor shaft (5) is guided, the cap ring (7) which can be cooled taking up at least part of an annular intermediate space (ZR) which is in the axial region (BW) of a protruding winding head (6) and the rotor shaft (5). The invention relates to an electrical machine, in particular an asynchronous or synchronous motor, having such a cooling device.

Abstract: The invention relates to a rotor of an asynchronous machine with grooves (7) for accommodating short circuit rods on the ends of the laminated core (1), the respective ends of the short circuit rods being connected by an end ring (3) and additional profiled sheets (2) being provided in the region of the end rings (3) for laminating of the laminated core (1) and for absorbing the centrifugal forces of the end rings (3). Comparatively high speeds can thus be achieved.

Abstract: Manufacturing costs of releasable permanent magnet rotors or asynchronous squirrel cages should be reduced. Accordingly, a rotor is proposed which includes at least one ring-shaped fastening device (23) secured in fixed rotative engagement to one of the end faces of a magnet device (21, 22) and for form-fitting or force-locking connection to a shaft (25). This makes it possible to eliminate the need for a special bearing sleeve, and the laminated armature core (21) can be provided with a larger axial hole diameter. As a result, the minimum joint pressure can be reduced so that deformations of the spindle and complicated refinishing processes can be avoided. In addition, less stringent manufacturing tolerances of the spindle (25) can be selected.

Abstract: A permanent magnet structure includes a carrier, and plural permanent magnets positioned on at least one side of the carrier for realizing a flat arrangement of the permanent magnets on a surface of, e.g. a shaft.