Abstract: A brush device (1) for electrically connecting a first element (2A) to a second element (2B) that can rotate relative to the first element (2A) about a rotational axis (L). In order to make electrical contact with the second element (2B), in a contact area (1A), the brush device (1) has a structure (1 B, 11B?, 1B?) that extends helically relative to the rotational axis (L). An E-machine (2) has a brush device (1) of this type, and a drive device has such an E-machine (2) for electrically driving a motor vehicle.

Abstract: The present method relates to a method of charging a traction battery of a vehicle from an external AC power supply system. The traction battery is coupled, via an inverter, to an electric alternating-field machine such that the AC power supply can be connected to the phase windings of the alternating-field machine. The method includes a step of synchronizing the rotational speed of the alternating-field machine with the frequency of the AC power supply. Then the AC power supply is connected to the phase windings of the alternating-field machine and the inverter, which is electrically coupled to the alternating-field machine, is operated as a step-up converter.

Abstract: An electrical charging system for an energy accumulator of a motor vehicle. The electrical charging system comprises a supply input in a conductor system having at least one phase conductor and a neutral line for energy supply from a grid. The charging system also comprises a rotating field machine which, via its phase windings, is operably connected to a rectifier. The rectifier is provided on the other side for connection to the energy accumulator to be charged, the phase windings of the rotating field machine can be either selectively isolated and interconnected such that the charging system is designed for step-up connecter charging operation and step-down charging operation by way of at least one isolated phase winding and, in particular, all the isolated phase windings.

Abstract: An electrical charging system having a rectifier which is supplied with energy via an input. An inverter whose alternating voltage side is connected, via phase conductors, to windings of a rotating field machine and whose direct voltage side can be connected to an energy accumulator to be charged. A first current path section passes current, supplied by the rectifier, into the charging system via the plus terminal or pole of the rectifier and the rotating field machine to the inverter. The first current path section passes the current via phase windings of the rotating field machine, such that the first current path section comprises a first switch, which can selectively interrupt the first current path section. The charging system can operate, by the first switch and at least one phase winding in the first current path section, as a step-up and step-down converter in the direction toward an energy accumulator.

Abstract: A method of charging a traction battery, in particular of a motor vehicle, from an external AC power supply system, in particular a three-phase power supply system. The traction battery to be charged is coupled, via an inverter, to an electric alternating-field machine in such manner that the AC power supply can be connected to the phase windings of the alternating-field machine. During a first step, the rotational speed of the alternating-field machine is synchronized with the frequency of the AC power supply, and during a second step, the AC power supply is connected to the phase windings of the alternating-field machine and the inverter, electrically coupled to the alternating-field machine, is operated as a step-up converter.

Abstract: An electrical charging system having a rectifier which is supplied with energy via an input. An inverter whose alternating voltage side is connected, via phase conductors, to windings of a rotating field machine and whose direct voltage side can be connected to an energy accumulator to be charged. A first current path section passes current, supplied by the rectifier, into the charging system via the plus terminal or pole of the rectifier and the rotating field machine to the inverter. The first current path section passes the current via phase windings of the rotating field machine, such that the first current path section comprises a first switch, which can selectively interrupt the first current path section. The charging system can operate, by the first switch and at least one phase winding in the first current path section, as a step-up and step-down converter in the direction toward an energy accumulator.

Abstract: An electrical charging system for an energy accumulator of a motor vehicle. The electrical charging system comprises a supply input in a conductor system having at least one phase conductor and a neutral line for energy supply from a grid. The charging system also comprises a rotating field machine which, via its phase windings, is operably connected to a rectifier. The rectifier is provided on the other side for connection to the energy accumulator to be charged, the phase windings of the rotating field machine can be either selectively isolated and interconnected such that the charging system is designed for step-up connecter charging operation and step-down charging operation by way of at least one isolated phase winding and, in particular, all the isolated phase windings.

Abstract: A drive train of a motor vehicle, having a hybrid drive comprising an internal combustion engine and an electric machine, and an automatic group transmission connected between the hybrid drive and an axle drive. The group transmission has at least a main gearing in a countershaft design, having a main shaft and at least one countershaft, a front-mounted group, particularly implemented as a splitter group, upstream in terms of drive technology of the main gearing, and/or a rear-mounted group, particularly implemented as a range group, downstream in terms of drive technology of the main gearing. An input shaft of the group transmission is connected, via a controllable startup clutch, to the internal combustion engine, and an output shaft of the group transmission is connected to the axle drive, and the electric machine of the hybrid drive is connected to the at least one countershaft.

Abstract: An inverter, particularly for supplying energy to a three-phase motor (3) of a motor vehicle, where the inverter comprises a half bridge (1a, 1b, 1c) for electrically connecting to the three-phase motor (3). The half-bridge (1a, 1b, 1c) comprises a short circuit element (8) which is electrically conductively connected to an input (6b) and an output (6c) of a power semiconductor switch (5a; 5b) of the half bridge (1a, 1b, 1c). The short circuit element generates a short circuit, between the input (6b) and the output (6c) of the power semiconductor switch (5a; 5b), depending on the voltage value of a voltage present between the input (6b) and the output (6c) of the power semiconductor switch (5a; 5b).

Abstract: A power switch arrangement (1) for an inverter, particularly a drive inverter, the power switch arrangement (1) having a power semiconductor switch (2) and a protective circuit (3) disposed at the power semiconductor switch (2) protecting against reverse voltage transfer from the three-phase motor (5) that can be connected to the power semiconductor switch. The semiconductor power switch (2) having a control input (2a) and a switch input (2b), and a switch output (2c). The protective circuit (3) includes a series circuit, having a zener diode (7) and a first ohmic resistance (8), connected between the switch input (2b) and the control input (2a), and a series circuit, having a second ohmic resistance (9) and a diode (10), switched between the control input (2a) and the switch output (2c).

Abstract: An inverter, particularly for the energy supply of a three-phase motor (3) of a motor vehicle, where the inverter comprises a half bridge (1a, 1b, 1c) for electrically conductively connecting to the three-phase motor (3). The half-bridge (1a, 1b, 1c) comprises a voltage limiting element (8) which is electrically conductively connected to an input (6b) and an output (6c) of a power semiconductor switch (5a; 5b) of the half bridge (1a, 1b, 1c). The voltage limiting element creates, in a defined manner, a high impedance or low impedance connection between the input (6b) and the output (6c) of the power semiconductor switch (5a; 5b), depending on the voltage value of a voltage present between the input (6b) and the output (6c) of the power semiconductor switch (5a; 5b).

Abstract: A steering system for tracked vehicles having two brake circuits which is activated after a failure of the primary steering mechanism. The steering system includes a steering switch (L) that can be controlled by a steering axle which, in the event of primary steering system failure, acts upon the brakes of the vehicle in such a manner that rotation of the steering axle results in a braking action upon a track on the inside of a curve.

Abstract: A steering system for tracked vehicles having two brake circuits which is activated after a failure of the primary steering mechanism. The steering system includes a steering switch (L) that can be controlled by a steering axle which, in the event of primary steering system failure, acts upon the brakes of the vehicle in such a manner that rotation of the steering axle results in a braking action upon a track on the inside of a curve.