Abstract: The present invention relates to an electrical machine having a stator. The stator comprises a plurality of slots for receiving a stator winding. One respective conductor section of the stator winding is inserted into each slot. The conductor sections of at least one pair of poles are short-circuited to one another on a first side of the stator. The conductor sections on a second side of the stator, opposite from the first side, are each connected to a terminal of a power supply unit. The power supply unit consists of two annular electrical conductors, between which at least one power-electronics component is arranged.

Abstract: The invention relates to a power supply unit for supplying multiple conductor portions (3) of a stator winding of an electric machine which are inserted in respective slots (2), wherein the power supply unit is configured to supply a first conductor portion and a second conductor portion with at least one different operating parameter of a respective current function and/or the power supply unit is configured to supply a conductor portion with at least two superimposed current functions, which in each case have at least one different operating parameter. Furthermore, the invention relates to an electric machine having such a power supply unit.

Abstract: The invention relates to a power supply unit for supplying multiple conductor portions (3) of a stator winding of an electric machine which are inserted in respective slots (2), wherein the power supply unit is configured to supply a first conductor portion and a second conductor portion with at least one different operating parameter of a respective current function and/or the power supply unit is configured to supply a conductor portion with at least two superimposed current functions, which in each case have at least one different operating parameter. Furthermore, the invention relates to an electric machine having such a power supply unit.

Abstract: The present invention relates to an electrical machine having a stator. The stator comprises a plurality of slots for receiving a stator winding. One respective conductor section of the stator winding is inserted into each slot. The conductor sections of at least one pair of poles are short-circuited to one another on a first side of the stator. The conductor sections on a second side of the stator, opposite from the first side, are each connected to a terminal of a power supply unit. The power supply unit consists of two annular electrical conductors, between which at least one power-electronics component is arranged.

Abstract: The invention relates to a drive device for a rotary anode of an X-ray tube, including an induction motor (13) whereto an alternating voltage can be applied by means of an inverter (20), and also including a control unit (22) for controlling the inverter (20), the switching frequency of the inverter (20) being variable in time, in conformity with a frequency time characteristic, by means of the control unit (22). It is the object of the invention to provide a drive device for a rotary anode of an X-ray tube as well as a suitable control method which ensures the temperature-independent starting up of the rotary anode.

Abstract: Stator elements each accommodate at least one stator coil (5, 6), and a rotor (2) comprises a permanent magnet (10) which is axially supported by means of at least one axial bearing (11), the rotor (2) having an inner screwthread (12) in which a threaded spindle (13) is engageable. The permanent magnet (10) of the rotor (2) projects beyond the respective outer end (7, 8) of the stator return element (3, 4) at at least one axial end (10a, 10b), in such a manner that in spite of a displacement of the rotor (2) as a result of bearing tolerances of the axial bearing (11) substantially the entire electromagnetic field of the stator coils (5, 6) is linked to the rotor (2).

Abstract: The invention relates to a linear actuation device for a control member (1), particularly a valve tappet (1) in a gas or liquid conduit (2), the device including a rotor (7) with an inner screwthread (10) whose rotary movement is convertible into a linear movement of a threaded spindle (5) which is locked against rotation and which is engageable with the inner screwthread (10).In order to achieve that such a device can be realized simply, cheaply and with a high resolution of the linear movement of the control member, the rotor (7) comprises a magnetized rotary body (8) which cooperates with a single-strand electrically energizable stator (13), the angular position of the rotor (7) being adjustable by means of the stator current and the maximum angular rotation of the rotor (7) being smaller than 180.degree..

Abstract: The invention relates to a fan unit for generating gas streams, in particular for vacuum cleaners, which unit comprises an impeller wheel (1) and a motor (4), which is a radial induction motor comprising an external stator (2) and an internal rotor (3), the stator (2) comprising a laminated core (2a) with coils (2b) arranged in slots, the rotor (3) comprising two concentric cylinders (3a, 3b), of which the outer cylinder (3b) is made of an electrically highly conductive material and the inner cylinder (3a) is made of a magnetically highly conductive material, one of the two axial end faces (3c) of at least one of the two rotor cylinders (3a, 3b) being in planar contact with the impeller wheel (1), the motor (4) being energised by means of a frequency changer (29 to 37) and the speed setting being derived from process-dependent nominal values and adjustable set-point values.

Abstract: The invention relates to a drive device for a rotary anode of an X-ray tube having a drive motor with a stator (10) and a rotor (15; 21) which drives the rotary anode, the stator (10) and the rotor (15; 21) being separated by a gap and the stator (10) having slots (11) whose circumferential length (17) has been dimensioned for driving a bipolar X-ray tube. In order to enable a more universal use of such a drive device the stator (10), which has been dimensioned for driving the bipolar X-ray tube, is also used for driving a unipolar X-ray tube, the diameter of the rotor (21) and thus the gap (22) being dimensioned in such a manner that the efficiency or the torque of the drive device lies within a maximum range (II).

Abstract: The invention relates to an axial-flow induction motor comprising a stator having a winding arranged in a slot and a rotably supported laminated rotor which is spaced from the stator by an air gap. The rotor has a magnetically highly conductive layer on the side which is remote from the stator and an electrically highly conductive layer on the side which faces the stator. In order to reduce losses caused by harmonics, the rotor also includes an additional magnetic conductive layer between the electrically highly conductive layer and the air gap. The magnetic conductivity of the additional magnetic conductive layer in the direction of rotation is low in comparison with the magnetic conductivity of the magnetically highly conductive layer. The electrically highly conductive layer is also thicker than the magnetically conductive layer.

Abstract: An axial flux induction motor has a stator and a disc-shaped rotor facing the stator with an air gap there-between. The rotor disc includes a first material of relatively high magnetic permeability and a second material of relatively high electrical conductivity, the first material being of higher specific gravity than the second material. The first material is in the form of an annular ring imbedded in or supported on one surface of the disc, opposite the surface thereof which faces the stator. The outer radius R.sub.1 of the annular ring and the outer radius R.sub.2 of the disc are related so that 1.2 R.sub.1 <R.sub.2 <1.6 R.sub.1. This achieves that at high rotational speeds the two disc materials will be subjected to more nearly equal centrifugal forces thereby making it feasible to operate at higher motor speeds.

Abstract: The invention relates to a device for driving the rotary anode of an X-ray tube, which device comprises a drive motor (5) having a stator (5a) and a rotor (5b), which are operated at anode potential, a rotor shaft (6) driving the rotary anode (7), the rotor (5b) of the drive motor (5) being constructed as an external rotor and the motor (5) being powered by means of a potential-isolating transmission means.