Abstract: The invention relates to a non-railbound land vehicle (2) comprising a drive system with the following components; a combustion engine-generator unit (=VG unit) (14, 16); at least one electric drive motor (18, 20); a power control station (30) for the electric motor that can be operated by the driver of the vehicle and a control electronics (24) that is connected to the VG unit, the electric motor and the power control station.

Abstract: A permanent-magnetically excited electric machine comprising a stator part (2) and a moving part (30) movable relative to the stator part (2), as well as an air gap (8) between the stator part (2) and the moving part (30), with one of said stator part (2) and said moving part (30) having a flux path assembly for magnetic flux and winding coils (6) and the other one of said stator part (2) and said moving part (30) having a flux path assembly for magnetic flux and permanent magnets (36), characterized in that there is provided a flux conduction liquid (18) that is conductive for magnetic flux; and that in the region of the flux path assembly of the stator part (2) and/or of the moving part (30), there is provided at least one filling space (12; 16; 20; 38; 46; 48; 50) which, for changing the magnetic flux conductivity of the flux path assembly, may have optionally more or less flux conduction liquid supplied (18) thereto.

Abstract: A power converter device for a switched reluctance motor, comprises a semiconductor circuit arrangement in the form of an asymmetric inverter, to supply one of the motor windings on the reluctance motor with current or to commutate the current from the winding. The achievement of the maximum possible current amplitude may be accelerated and the commutating of the current from the motor winding may be accelerated, whereby, in addition to the main voltage source, an additional voltage source in the form of a circuit extension is provided, which, by means of providing an additional voltage of corresponding polarity, accelerates the current feed to the relevant motor winding, or accelerates the removal of the current (commutating) from the motor winding.

Abstract: For enhancing the operational safety of an electric drive unit of a vehicle comprising a generator, which is operated by a combustion machine, and drive motors, which are connected to said generator via a direct-voltage intermediate circuit, the generator and drive motors are each subdivided into partial units, and these partial units have partial power electronics units associated therewith. The mutually corresponding partial units of generator, motors and power electronics units each constitute a drive circuit of their own, with control signals being supplied to components thereof by a specifically assigned system control unit. The system control units that are interconnected via an information exchange channel can undertake compensation measures in their drive circuit or in the other drive circuits in the event of a complete or partial failure of a drive circuit.

Abstract: The invention relates to a high-voltage transformer arrangement which converts to the direct current voltage from a direct current voltage source (2) into a direct current voltage output signal (Vout), using a current inverter (4) and a transformer (8) to an output rectifier (12), which is connected downstream, and a filter (14). The transformer (8) has a transformer core comprising several interruption points in the magnetic path, at which insulator sections are located. The individual core sections are controlled by potential. The separate transformer core sections together with their corresponding windings form a primary system and a secondary system, which is separated from said primary system both spatially and in terms of potential, having a relatively high stray inductance.

Abstract: A reluctance electric machine comprising: (a) a stator part (4) with stator teeth (12) of magnetically conductive material that are provided with coil windings (24); (b) and a rotor part (6) arranged coaxially with respect to the stator part (12) and located opposite the stator part (12) so as to leave free an air gap (8) therebetween; (c) the rotor part (6) having a number of discrete poles (20) of magnetically conductive material that project in the direction towards the stator part (12), characterized in (d) that cooling with channelled coolant flow is provided at least for partial sections of the coil windings (24) of the stator part (12).

Abstract: If an interturn short-circuit occurs in a stator coil winding of a permanent magnet excited electric machine, a short-circuit current is produced there that results in an electrically induced magnetic alternating flux which corresponds in its value to the permanent magnetic alternating flux flowing through the respective winding and which is opposite in phase. Such a sort-circuit current could lead to burn-off of the turn due to its considerable strength and the loss associated therewith. To prevent this, the invention suggests in case of detection of an interturn short-circuit, to entirely short-circuit at least the coil affected by the short-circuit or to apply thereto a corresponding in-phase current and to reduce the excessive short-circuit current in the individual turn or in the individual turn section by way of this overall short-circuit current in the coil. It is thus possible to prevent burn-off of the respective turn part.

Abstract: For obtaining a compact superconductive power switch for rapid switching speeds and with high dielectric strength, several winding layers (10a . . . 10h) with several windings each are lined up adjacent each other in axial direction. Between individual layers (10a . . . 10h), there are provided cooling/heating elements (8a to 8d) in order to transfer the high-current switch unit (1) to the superconducting state and the normally conducting state, respectively, by cooling/heating, i.e. for closing and opening said unit, respectively. Mutually adjacent current conductors have the switching current flowing therethrough in opposite directions, so that the high-current switch unit (1) is of low induction, which permits fast switching times in particular when the switch is opened by an additional current pulse.

Abstract: An electric machine comprising the following features: (a) an outer, first stator part and an inner, second stator part, the two stator parts being coaxial and being radially spaced apart by an intermediate space; (b) each stator part has, facing the intermediate space, a circumferential series of stator poles, at least a partial number of which carries a winding; (c) a rotor part disposed in the intermediate space; (d) the rotor part has a circumferential series of alternating permanent magnets and magnetic flux conducting pieces, said permanent magnets being magnetized in circumferential direction; (e) the width of the permanent magnets—measured in circumferential direction—is larger on the central radius of the rotor part than radially outside and radially inside on the rotor part and the width of the magnetic flux conducting pieces—measured in circumferential direction—is correspondingly smaller on the central radius of the rotor part than radially outside and radially inside on th

Abstract: Gas diffusion electrodes (1) for polymer electrolyte membrane fuel cells are modified such that the diffusion of water therein is inhibited in comparison with un-modified electrodes. Polymer electrolyte membrane fuel cells with the modified gas diffusion electrodes can be operated, with on the average unchanged operating conditions, without addition of water, since the gas diffusion electrodes do not allow more water to escape than that formed during the reaction of burnable gas and oxidizing agent, and guarantee sufficient membrane moisture.

Abstract: An electric machine comprising a stator and a rotor (2) separated by an air gap (12), (a) the rotor (2) being composed with permanent magnets (8) magnetized substantially in circumferential direction, and with one magnetic flux conducting piece assembly (10) of at least one magnetic flux conducting piece (10a; 10b) between two adjacent permanent magnets each; (b) the permanent magnets (8)—when looking at the overall geometry—each having an increasing circumferential width from the head portion on the side of the air gap to the foot portion; (c) and the conducting piece assemblies (10) between two adjacent permanent magnets (8)—when looking at the overall geometry—each having a decreasing circumferential width from the head portion on the side of the air gap to the foot portion, characterized in (d) that the conducting pieces (10a; 10b) at the foot end each have a widened portion in circumferential direction, having at least one shoulder (20) through which they are supported on an a

Abstract: Fuel cell stack and method of regulating membrane moisture of polymer electrolyte membranes of fuel cells of the fuel cell stack includes ascertaining electronically an average value of an electrical value corresponding to moisture of the polymer electrolyte membranes of a number of fuel cells of the fuel cell stack without utilization of an auxiliary electrode, the number of fuel cells ranging from two fuel cells to all fuel cells of the fuel cell stack; and adjusting the moisture of the polymer electrolyte membranes of the number of fuel cells to an optimum moisture as a function of the average value ascertained.

Abstract: A component carrier (2) with electric components (4) mounted thereon, having at least one channel (14) for cooling liquid, characterized in that the component carrier (2) has an air cooling body (6), and a fan (8) is associated with the component carrier (2) for producing a forced air stream for air cooling at least part of the components (4) and for air recooling on the air cooling body (6).

Abstract: An electric pump includes an impeller, a shaft and a motor having at least one permanent magnet rotor and a stator. The impeller is coupled by the shaft to the at least one permanent magnet rotor of the electric motor. A hermetically sealed housing is provided in which the shaft is supported and which has openings for delivery side and suction side connections for material to be pumped. The rotor is disposed inside the housing and the stator of the electric motor is disposed outside the housing. At least one stator carrier is attached to the housing, the stator being mounted in the at least one stator carrier. The at least one stator carrier is of one-piece configuration so as to enclose the housing across an entire circumference thereof in a cup-shaped manner. The at least one stator carrier holds a liquid for cooling the at least one stator.

Abstract: An electric machine includes an exciter part and an induction part disposed adjacent the exciter part. The exciter part and the induction part define an air gap there-between and are movable relative to one another thereby defining a direction of movement. The induction part includes teeth disposed adjacent one another and projecting in a direction toward the air gap. The teeth define grooves therebetween, each of the teeth having a tooth base and a tooth tip adjacent the air gap. In addition, each of a plurality of the teeth further includes a middle portion having two ends and a constant width defined in a direction along the air gap and perpendicular to the direction of movement; and a pair of tooth widening portions, each of the tooth widening portions having a free end and a transition end and being located at one of the two ends of the middle portion at the transition end thereof for forming one of the plurality of the teeth with the middle portion.