Robert Boschgmbh

Sebastian Paulus

Michele Hirsch

Wei-Lung Lee

Manuel Mueller

Paul Mehringer

Gunther Goetting

Gerhard Knecht

Zoltan Ersek

Michael Koerner

Miriam Riederer

Armin Niederer

Arun Siddalingappa

Kurt Reutlinger

Falco Sengebusch

Timo Kuehn

Thomas Zeltwanger

Lei Chen

Maximilian Manderla

Michael Wohlfarth

Florian Malchow

The invention relates to a method for operating an electric machine. A harmonic manipulated variable with respect to a harmonic of a predetermined frequency occurring during the energization of the electric machine is determined. The electric machine is energized using the determined harmonic manipulated variable by means of a pulse width modulation method. For each period of the pulse width modulation method, the harmonic manipulated variable is determined for both a switch-on operation and a switch-off operation.

Method and device for operating an electric machine

The invention relates to a method () for regulating an electric machine () comprising a harmonic regulator (), wherein the harmonic regulator comprises an input transformer (), a regulator (), and an output transformer (). The method has the steps of: ascertaining () a feedback variable (Idq); transforming () the feedback variable (Idq); ascertaining () a regulating deviation; ascertaining () an equalization variable (UHrmc*); back-transforming () the equalization variable (UHrmc*); and energizing () at least one winding of the electric machine () on the basis of the actuating variable (UdqHrmc*).

Method and device for regulating an electric machine

The invention relates to a method () for regulating an electric machine (), comprising a harmonic filter (), said harmonic filter () comprising a second filter () and a filter output transformer (). The method has the steps of: ascertaining () a feedback variable (Idq); determining () a filter specification variable (FV); filtering () the filter specification variable (FV); ascertaining () a filtered feedback variable without harmonic components (IdqFunda); and energizing () at least one winding of the electric machine () on the basis of the filtered feedback variable without harmonic components (IdqFunda).

The invention relates to a method () for calibrating a controller of an electric machine (). The method comprises the following steps: specifying () a first signal (S_) for generating a sinusoidal phase current for energising a winding of an electric machine (); superposing () the first signal (S_) with a test signal (S_Test_i) in order to generate a harmonic oscillation with a predetermined excitation amplitude and/or phase position relative to the phase current, which harmonic oscillation superposes the phase current; detecting () a response signal (S_Antw_i), resulting from the superposition of the phase current and the harmonic oscillation, by means of a sensor (); determining () a calibrated signal (S_kal) for generating a harmonic oscillation with a predetermined excitation amplitude and a phase position relative to the phase current on the basis of a determined minimum of a response plane (A_Antw); operating () the controller () of the electric machine () on the basis of the determined minimum.

Method and device for calibrating a controller of an electric machine

The invention relates to a method () for regulating an electric machine (), comprising at least one first filter () and at least one second filter (). The method has the steps of: ascertaining () a feedback variable (Idq); filtering () a specifiable GW matching variable (Idq*); ascertaining () the filtered feedback variable without fundamental components (IdqWo-Funda); filtering () the filtered feedback variable without fundamental components (IdqWo-Funda); ascertaining () a filtered feedback variable without harmonic components (IdqFunda); and energizing () at least one winding of the electric machine () on the basis of the filtered feedback variable without harmonic components (IdqFunda).

The present invention relates to a control system () for an electric machine (EM), for producing a braking torque, by means of the electric machine (EM), in a traction drive, said system comprising a control device (SE), the control device (SE) being configured to control a generator voltage or a generator current in or through a power electronics system (LE) of the electric machine such that during a movement of the traction drive, the electric power (Pel) of the electric machine (EM) can be limited to a level at least below a predefined minimum value.

Control system for an electric machine for producing a braking torque by means of the electric machine, and method for operating a control system for an electric machine

Signal processing for determining a rotor position without the use of encoders. To this end, test signals are applied to the electrical currents in the phase connections of an electric machine, and the total currents in the phase connections of the electric machine are measured. The current responses to the test signals are determined by establishing the difference between the measured phase currents and the setpoint-value settings for the phase currents. On the basis of this difference, any method for calculating the rotor angle position can be performed.

Apparatus and method for ascertaining a rotor position, and electric drive system

The invention relates to a method for detecting an error in a generator unit which has an electric machine () with a rotor winding (), a stator winding (), and a rectifier () connected thereto, via which the electric machine () is connected to an onboard electrical system () of a motor vehicle, wherein a voltage of the onboard electrical system () is controlled to a target value via an excitation current (I) through the rotor winding () of the electric machine (), and a curve of a phase voltage (U) of the stator winding () is monitored, wherein an error in the generator unit is inferred when a change of the phase voltage (U) is detected and a voltage of the onboard electrical system () changing within a threshold value range (S) is detected.

Method for detecting an error in a generator unit

The invention relates to a control system and to a method for operating a synchronous machine. In particular, the synchronous machine is controlled on the basis of a rotor angle that was determined by means of a sensorless rotor-angle detection method. In order to check the reliability of the rotor angle determined without sensors, the difference value between the rotor inductances in the q direction and in the d direction is monitored. If said difference value falls below a limit value, this indicates possible instabilities in the determination of the rotor angle.

Control system for a synchronous machine and method for operating a synchronous machine

A method for detecting an error in a generator unit which has an electric machine () with a rotor winding () and a stator winding () and a rectifier () connected thereto, via which rectifier the electric machine () is connected to an electrical system () of a motor vehicle, the excitation current (IE) flowing through the rotor winding () of the electric machine () being plotted and it being concluded that there is an error in the generator unit depending on whether a frequency component (A) of a frequency spectrum of the plot of the excitation current (IE) in a frequency range above a lower speed limit (SW) is larger than a threshold value (S).

The invention relates to a method for detecting an error in a generator unit which has an electric machine () with a rotor winding (), a stator winding () transformer-coupled to the rotor winding (), and a rectifier () connected to said stator winding, via which the electric machine () is connected to an onboard power supply () of a motor vehicle, wherein a decision is made, depending on a magnitude of a correlation (K, K) between a curve of an excitation current (I) flowing through the rotor winding () of the electric machine () and a curve of a voltage drop (U, U) on one side of the transformer, as to whether the error is present or not.

The invention relates to a method for operating a synchronous machine, comprising the following steps: determining a difference value between the rotor inductance of the synchronous machine in the polar axis direction and the rotor inductance of the synchronous machine in the pole-gap direction for each of a plurality of different 2-tuples from values of useful current adjusted in the rotor-fixed coordinate system of the synchronous machine; preparing a characteristic diagram for the determined difference values in dependence on the 2-tuples of the values of useful current; determining a torque-dependent operating-point trajectory for the 2-tuples of the values of useful current taking into account the magnitude of the determined difference values along the operating-point trajectory to be determined; and operating the synchronous machine according to the determined operating-point trajectory.

A method for establishing the rotor angle of a synchronous machine. The method includes determining a first estimated value for the d-axis of the synchronous machine, feeding at least one refinement voltage pulse pair into the stator of the synchronous machine, the refinement voltage pulse pairs each distanced from the first estimated value for the d-axis of the synchronous machine by the same angular value in different directions, detecting the angle-dependent refinement current responses to the refinement voltage pulses, determining the angle-dependent refinement phase differences on the basis of the respective detected refinement current response, determining first estimated curves on the basis of at least some of the angle-dependent refinement current responses, determining second estimated curves on the basis of at least some of the angle-dependent refinement phase differences. and determining a refined estimated value for the d-axis of the synchronous machine on the basis of the estimated curves.

Control device and method for establishing the rotor angle of a synchronous machine

A method and a device for establishing the rotor angle of a synchronous machine. In one embodiment, the method includes the steps of feeding at least one initial voltage pulse of predefinable pulse length and pulse height into the stator of the synchronous machine, detecting the respective current response to the at least one initial voltage pulse, determining the respective phase difference on the basis of the respective detected current response, establishing at least one first estimated value by comparing the current response with a current response characteristic curve of the synchronous machine, establishing at least one second estimated value by comparing the phase difference with a phase difference characteristic curve of the synchronous machine, forming a multiplicity of differences between each of the first estimated values and each of the second estimated values, and determining an initial estimated value for the rotor angle of the synchronous machine on the basis of the determined difference having the lowest value.

Determining the rotor angle of a synchronous machine. In one aspect, the invention provides a method that includes generating a multiplicity of pulse-width-modulated drive signals for the phases of an inverter feeding the synchronous machine depending on a voltage to be fed into the synchronous machine, and applying a first phase shift to one or more of the multiplicity of pulse-width-modulated drive signals, so that the duration of the switching states of the inverter is extended in order to generate a first switching pattern for the phases of the inverter. The method also includes applying a second phase shift to one or more of the multiplicity of pulse-width-modulated drive signals for generating a second switching pattern, selecting one or more of the first and second switching patterns, determining one or more of neutral point potentials at the neutral point of the synchronous machine, and calculating the rotor angle of the synchronous machine.

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Esslingen am Neckar, Germany

Sebastian Paulus