Abstract: An electric machine for starting an internal combustion engine, comprising a housing (10) having at least one sealing device (14) which seals an interior (10a) of the housing with respect to the surroundings of the housing (10), and at least one pressure reduction device (1), wherein the at least one pressure reduction device (1) is embodied so as to be moveable in a translatory fashion relative to the at least one sealing device (14) in order to form, in the case of an overpressure in the interior (10a) of the housing, at least one venting duct via which an at least partial reduction in pressure is ensured.

Abstract: Method for removing U-shaped winding elements for an electromagnetically excitable core of an electric rotation machine from a setting tool, wherein the U-shaped winding elements are set and are initially located in the setting tool, wherein in one step the winding elements are partially lifted out from the setting tool, so that parts of rod sections of the winding elements are freely accessible from the outside, characterized in that the winding elements are removed from the setting tool by means of a removal device, by gripping the rod sections.

Abstract: A method for operating an electric machine having a power inverter, which is electrically connected to a relative ground potential, and a ground differential voltage between the relative ground potential and a reference ground potential is monitored, and if the ground differential voltage reaches an upper limit value, the electric machine is operated in a current-delivering operating state, and if the ground differential voltage reaches a lower limit value, the electric machine is operated in a non-current-delivering operating state.

Abstract: A method for controlling an externally excited electric machine to boost regeneration of a NOx storage catalyst which is part of an assembly made up of an internal combustion engine, the externally excited electric machine which is connected to the internal combustion engine in a manner allowing the transmission of torque and which has a rotor including a rotor winding and a stator, and the NOx storage catalyst which is disposed in an exhaust-system branch downstream of the internal combustion engine, the rotor winding of the electric machine being energized with a preexcitation current as a function of an operating state of the NOx storage catalyst.

Abstract: A method for switching on a multi-phase electrical machine in a motor vehicle, the multi-phase electrical machine having a rotor having a rotor winding, and a stator having a multi-phase stator winding; a phase voltage having a phase voltage vector being applied, in a PWM operating mode, to the stator winding, said vector corresponding in terms of absolute magnitude and direction to a pole wheel voltage vector of a pole wheel voltage; the rotor winding being energized by an excitation current; and the PWM operating mode being deactivated, and a block operating mode for application of the phase voltage being activated, when at least one parameter influencing the pole wheel voltage reaches a threshold value.

Abstract: An active converter connected to an electric machine, including arresting circuits to activate a voltage arresting function from a first point-in-time, and which is configured to only activate a load dump reaction upon activation conditions from a second point-in-time, the activation conditions include that it is determined that at the second point-in-time, a supply-side voltage potential applied to an exciter winding of the electric machine is between the voltage potential applied at the first DC voltage terminal and a ground potential, if the exciter winding is disconnected from the voltage potential of the vehicle electrical system voltage and/or a current flowing through the exciter winding is below a current threshold value and/or after an initial activation of a load dump reaction, after which further load dump reactions were activated, more than a predefined period of time has elapsed and/or more than a predefined number of load dump reactions were activated.

Abstract: A rectifier circuit is described, which includes a cathode terminal, an anode terminal and, between the cathode terminal and the anode terminal, an electronic circuit which includes at least one MOSFET transistor including an integrated inverse diode, the drain-source breakdown voltage of the MOSFET transistor operated in the avalanche mode corresponding to the clamping voltage between the cathode terminal and the anode terminal of the rectifier circuit. In addition, a method is provided for operating a rectifier circuit which contains a cathode terminal, an anode terminal and, between the cathode terminal and the anode terminal, at least one MOSFET transistor including an integrated inverse diode, the drain-source breakdown voltage of the MOSFET transistor being selected in accordance with the clamping voltage between the cathode terminal and the anode terminal, and the MOSFET transistor being operated in the avalanche mode.

Abstract: A method for operating a motor vehicle having a vehicle electrical system, which includes at least one electrical or electronic component, which experiences a load during an operation of the motor vehicle, an accumulated load of the at least one component being ascertained, at least one type of damage contributing to the load being ascertained, a service life of the at least one component to be expected as a result of the ascertained accumulated load being ascertained, and at least one variable damaging the at least one component during operation, which is selected as a function of the at least one type of damage, being changed in a load-reducing direction if the service life to be expected of the at least one component deviates from a setpoint service life.

Abstract: A method is provided for switching on and switching off an n-phase electric machine in a motor vehicle. The n-phase electric machine includes a rotor with a rotor winding, and a stator with an n-phase stator winding. An excitation current may be applied to the rotor, and an n-phase phase voltage may be applied to the stator. The excitation current is switched on or off, a parameter which influences a synchronous generated internal voltage is determined, and the phase voltage is switched on or off when the parameter which influences the synchronous generated internal voltage reaches a certain threshold value.

Abstract: In an active converter that is connected to an electric machine, in which arresting circuits for activating a voltage arrest beginning at a first point in time are provided, and which is also configured for activating a load shedding reaction only when activation conditions are fulfilled beginning at a second point in time, the activation conditions include determining that the voltage arrest is still activated at the second point in time, that a voltage potential has not yet fallen below the first threshold value, and/or that a value that indicates a current flowing through at least one phase connection is above a third threshold value.

Abstract: A method for controlling a multi-phase electric machine, operable at least in generator mode, whose phase terminals in an active bridge rectifier are respectively connected, via addressable first current valves capable of being switched on and shut off, to a first DC voltage terminal and via second current valves to a second DC voltage terminal. The method includes: in a generator mode of the electric machine after occurrence of a load dump, repeatedly initiating and discontinuing phase short circuits of the phase terminals via the first current valves. A magnitude characterizing a natural frequency of the electric machine is ascertained, and the first current valves are addressed with a switching frequency in order to initiate and discontinue the phase short circuits on the basis of the magnitude characterizing the natural frequency of the electric machine.

Abstract: A motor vehicle electrical system which includes an electric machine, an active bridge rectifier, and at least one control device, the at least one control device being configured for converting an alternating voltage which is output by the electric machine at a number of phase connections into a direct voltage by controlling active switching elements of the bridge rectifier. An arrangement is provided configured for initiating a short circuit of at least two of the phase connections as soon as a signal characterizing the direct voltage exceeds an upper threshold value, and for deactivating the short circuit as soon as the signal characterizing the direct voltage subsequently falls below a lower threshold value. An evaluation device is provided configured for detecting a value of the direct voltage, for filtering the detected value, and for providing the filtered value as the signal characterizing the direct voltage.

Abstract: A method for controlling a bridge rectifier which includes active switching elements is provided, in which, during normal operation, at least one of the active switching elements is controlled using a voltage signal, the voltage of which is changed from a first voltage value to a second voltage value within at least one switching time. The at least one switching time is extended by a predefinable time period if load shedding at the bridge rectifier is determined. Also described is a corresponding rectifier system and a computer program product.

Abstract: A rectifier module for an active bridge rectifier having two switching elements, connected in series between two end terminals, and between which a center tap is formed, and a control circuit including a monitoring unit, a synchronization unit, and a control unit, the monitoring unit detecting a measuring voltage and outputting a request signal when the measuring voltage exceeds an upper threshold value. The synchronization unit outputs a synchronization signal to a synchronization terminal as long as the monitoring unit outputs the request signal, and otherwise to monitor the synchronization terminal for a synchronization signal. The control unit switches one of the two switching elements into a conductive state at least in sections during an activation period of time, when the monitoring unit outputs the request signal and/or when the synchronization signal is detected and is optionally recognized as valid by the monitoring.

Abstract: A half bridge for an active rectifier having an alternating-voltage connection, a positive direct-voltage connection, as well as a ground connection, a first switch element connecting the alternating-voltage connection to the ground connection; a second switch element connecting the alternating-voltage connection to the positive direct-voltage connection, a first control element being connected to the first switch element for switching the first switch element; a connection of a first capacitor being connected to a voltage supply connection of the first control element; the positive direct-voltage connection being connected via a first diode in the forward direction to the one connection of the first capacitor; the first capacitor being connected in parallel to a series connection of the first switch element and the second switch element.

Abstract: The invention relates to an electric machine (10) which is embodied as an alternator, comprising a rotor (20) and an axis of rotation (183), a stator iron (17) which maintains a stator winding (18). Said stator winding (18) comprises phase terminals of winding wires (204), a rectifier circuit (151) which comprises at least one bridge circuit consisting of a positive diode (99) and a negative diode (58). Said positive diode (99) and the negative diode (58) are connected in an electrically conductive manner to the phase terminal of winding wires (204) by means of a metal connecting element (133, 146) which has two half arms (215). One half arm (215) is connected in an electrically conductive manner to a positive diode (99) by means of a connecting section (216) and another half arm (215) is connected in an electrically conductive manner to the negative diode (58) by means of another connecting section.

Abstract: A method for measuring the temperature of a permanent magnet disposed on a rotor of an electrical machine, a magnetic property of the permanent magnet dependent on the temperature of the permanent magnet being sensed and the temperature of the permanent magnet being ascertained therefrom, and to an electrical machine, a processing unit, and a computer program for carrying it out.

Abstract: A bridge rectifier having AC voltage terminals, two DC voltage terminals, and a number of half-bridges corresponding to the number of AC voltage terminals. Each half-bridge has two activatable switching elements, connected in series between the DC voltage terminals and between which one of the AC voltage terminals is connected in each case. Each half-bridge includes a control circuit configured to detect an output voltage applied between the DC voltage terminals and switch a first switching element of the two switching elements of the particular half-bridge to be conductive by activation using a first control signal until the output voltage falls below a lower threshold value, after it has previously exceeded an upper threshold value, and to activate it in a clocked manner by activation using a second control signal, until the output voltage exceeds the upper threshold value, after it has previously fallen below the lower threshold value.

Abstract: An overvoltage protection circuit for a first subsystem of a multivoltage vehicle electrical system, in which the first subsystem having a first vehicle electrical system voltage, a second subsystem having a second vehicle electrical system voltage, and an electric machine for supplying the second subsystem. The first system voltage is less than the second system voltage. The overvoltage protection circuit includes a first ground connection for connecting a shared ground potential of the first subsystem, the second subsystem, and the electric machine, an additional second ground connection for connecting a reference ground potential, and a control connection for controlling the electric machine.

Abstract: The method includes operating the synchronous machine in idle operation; recording a phase voltage measured value of the synchronous machine; ascertaining a phase voltage expected value by allocating stored characteristics map values for the phase voltage, for the exciting current and the recorded rotational speed of the synchronous machine; and comparing the phase voltage expected value to the phase voltage measured value. Also described is a diagnostic device for carrying out this method, as well as a corresponding computer program product.