Robert Boschgmbh

Seg Automotive Germany Gmbh

Julian Roesner

Paul Mehringer

Fabio Magini

Mario Kaepple

Bernd Schroeder

Andreas Greis

Zoltan Ersek

Martin Henger

Benjamin Klein

Istvan Deak

Tobias Trzebiatowski

Arunkumar Motaganahalli Srinivasamurthy

Arunkumar M S

David Vitre

Martin Paetzold

Ralf Herbig

A method for ascertaining phase currents of an electric machine including a converter and stator including stator windings (phase number of at least three), in which the phase currents of measuring phases (at least two), are measured, the phase currents being measured in a measuring interval when the active switching elements of the measuring phases in a lowside path of the converter are activated in a switching interval delimited by a switching-on point-in-time and switching-off point-in-time, the phase currents of the remaining phases being determined arithmetically from the measured phase currents so that the measured phase currents, a spatial angle of the measuring phases, and a spatial angle of the remaining phases are used for arithmetic determination, in which the measuring interval is selected to be with respect to time outside a switching-on point-in-time or switching-off point-in-time of at least one of the active switching elements of the stator phases.

Method for ascertaining the phase currents of an electric machine including a converter

The invention relates to a method for switching off a multi-phase electric machine () in a motor vehicle, the multi-phase electric machine () comprising a rotor having a rotor winding () and a stator having a multi-phase stator winding (), wherein in a block mode () of the electric machine () a parameter influencing a synchronous generated voltage vector (U) of a synchronous generated voltage is adjusted such that the synchronous generated voltage reaches a first threshold value (S), wherein the block mode () is deactivated when the first threshold value (S) is reached and a PWM mode () for applying a phase voltage with a phase voltage vector (U) is activated, wherein the phase voltage vector (U) and the synchronous generated voltage vector (U) are varied in PWM mode () until the parameter influencing the synchronous generated voltage reaches a further threshold value (S), wherein the phase voltage is switched off when the further threshold value (S) is reached. Furthermore, the invention relates to a computing unit () configured to carry out the method.

Method for switching off a polyphase electrical machine in a motor vehicle

A method for determining the phase currents of an electric machine having a power converter, and a stator, the power converter having, for each phase, an upper branch having an upper switch and a lower branch having a lower switch, all the upper branches being connected to an upper DC voltage terminal and all the lower branches to a lower DC voltage terminal. The power converter is operated in an active rectification mode in which each upper switch is closed only as long as a phase voltage at the relevant upper switch is higher than a voltage at the upper DC voltage terminal, and each lower switch being closed only as long as a phase voltage at the relevant lower switch is lower than a voltage at the lower DC voltage terminal; phase branch currents being measured in all the lower branches.

Method for determining the phase currents of an electric machine having a converter

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.

Method for controlling an externally excited electric machine to boost regeneration of a NOx storage catalyst

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.

Method for switching on a multi-phase electrical machine in a motor vehicle

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.

Methods for switching on and for switching off an N-phase electric machine in a motor vehicle

An electrical machine includes an angular position transducer for identifying a first rotation angle of a rotor; a stator winding for generating a magnetic field; a voltage measuring instrument for sensing a pole wheel voltage at the ends of the stator winding upon a rotation of the rotor; and an identification circuit for identifying a second rotation angle from the pole wheel voltage and for identifying an angle difference between the first and the second rotation angle.

Calibration and monitoring of an angle measuring system for electrical machines

In a method for ascertaining the phase currents of an electric machine having a power converter and a stator with a phase number of four or more, the phase currents of a measuring number of measuring phases is measured, which is at least two and is lower by at least two than the phase number, and the phase currents of the remaining phases are arithmetically determined from the measured phase currents, at least the measured phase currents, a spatial angle of the measuring phases and a spatial angle of the remaining phases being used for the arithmetical determination.

Method for ascertaining the phase currents of an electric machine having a power converter

A method is described for shutting off an internal combustion engine in a vehicle that comprises an internal combustion engine and an electrical machine, an electrical torque furnished by the electrical machine being adapted in such a way that a change per unit time in a total torque lies within a definable range, the total torque being made up at least of a torque of the internal combustion engine and the electrical torque.

Method for shutting off an internal combustion engine

In a method for activating an electric machine having a rotor, a stator winding having multiple phases and a rectifier having multiple half-bridges corresponding to the number of phases, which each have active switching elements, alternating current signals, which are phase-offset to one another by switching the switching elements, are applied to the phases in a first motor operating mode in which the rotor rotates above a limiting speed, and in a second motor operating mode, in which the rotor rotates below the limiting speed, constant direct-current signals are at least partially applied to the phases by switching the switching elements as a function of an instantaneous angle position of the rotor, the direct-current signals being selected in such a way that a current flow does not exceed a predefined maximum current absolute value through any of the phases.

Method for activating an electric machine

A method is described for controlling a multiphase machine which is connected to a battery, the multiphase machine having a DC link which is provided with a DC link capacitor, phase windings, and a high side switch and a low side switch for each phase. The switches associated with the individual phases are controlled by a control unit in such a way that sinusoidal phase currents are predefined, at least one phase current is connected at any point in time in each control cycle, and a fixed, pulsed control pattern is present for each control cycle. The control widths of the actuating signals associated with the phases are constant in the pulsed control pattern. The control pulses associated with the individual phases are predefined in such a way that the DC link current which arises is minimized.

Method for controlling a multiphase machine

The invention relates to an electric machine (), particularly a generator or a starter generator for a motor vehicle, comprising a converter () which is arranged on a cooling element () and composed of semiconductor switching elements () actuated synchronously with the phase frequency for rectifying a generator alternating voltage or supplying a motor from a DC voltage source (). According to the invention, the cooling element () has a base plate () and cooling fins (), wherein the ratio of the surface wetted by coolant to the volume of the cooling element () ranges from 0.5 to 1.5 [l/mm], preferably from 0.8 to 1.0 [l/mm].

Electric machine

In a method for reducing the starting current of a multi-phase machine operated by block commutation, which includes a battery, one high side switch for each phase, a low side switch and a phase winding as well as a rotor, the high side switch assigned to one current phase or the low side switch assigned to one current phase is held in the closed state, and the low side switches or the high side switches assigned to the other current phases are alternately controlled.

Method for reducing the starting current of a multi-phase machine operated by block commutation

A method for reducing a ripple, caused by rotational nonuniformity of an internal combustion engine, in the output voltage of a generator which is driven by the internal combustion engine is provided. The generator has a stator winding, a rotor winding, a field controller, associated with the rotor winding, for regulating the output voltage of the generator, and a downstream power converter having controllable switching elements. To reduce the voltage ripple, the output voltage of the generator is regulated on the stator side by appropriately controlling the switching elements of the power converter.

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Untergruppenbach, Germany

Julian Roesner