DE102018211110A1 - Electric drive arrangement, in particular for the operation of a hybrid electric / electric vehicle - Google Patents

Abstract

Disclosed is an electric drive arrangement (AA), comprising: - a three-phase machine (DM) with a first winding system (SS1) with at least three first windings (U, V, W) and a second winding system (SS2) with at least three second windings (X , Y, Z), - a first inverter (WR1) having at least three first phase lines (Pu, Pv, Pw), wherein the first phase lines (Pu, Pv, Pw) are respectively connected to the respective corresponding first windings (U, V, W a second inverter (WR2) having at least three second phase lines (Px, Py, Pz), wherein the second phase lines (Px, Py, Pz) are respectively connected to the respective corresponding second windings (X, Y, Z) - at least one ammeter (SM12, SM24), which is electrically connected in a negative voltage side current path of one of the two inverters (WR1, WR2) and is arranged to flow through this negative voltage side current path wherein each of the second windings (X, Y, Z) is formed in pairs symmetrically with respective corresponding ones of the first windings (U, V, W) and opposite to the respective corresponding one of the first windings (U, V, W) inverted with the corresponding corresponding second phase line (Px, Py, Pz) is electrically connected.

Description

Technical area:

The present invention relates to an electric drive arrangement, in particular for the operation of a hybrid electric / electric vehicle.

State of the art and object of the invention:

Electric drive arrangements, in particular for the operation of a hybrid electric / electric vehicle, are known.

Like all other technical devices, there is a general requirement in electric drive assemblies to optimize for cost and functionality.

Thus, the object of the invention is to optimize an electrical drive assembly in terms of cost and functionality.

Description of the invention:

This object is solved by subject matter of the independent claim. Advantageous embodiments are the subject of the dependent claims.

According to a first aspect of the invention, an electric drive arrangement, in particular for the operation of a hybrid electric / electric vehicle, is provided.

The electric drive arrangement comprises a three-phase machine having a first winding system with at least three first windings and a second winding system with at least three second windings.

The electric drive arrangement further comprises a positive-voltage-side power connection and a first inverter having at least three first phase lines for providing phase currents for the first winding system, wherein the first phase lines are respectively electrically connected (in particular directly) to the respective corresponding first windings.

The electric drive arrangement also comprises a second inverter having at least three second phase lines for providing phase currents for the second winding system, wherein the second phase lines are respectively electrically connected (in particular directly) to the respective corresponding second windings.

The electric drive arrangement further comprises at least one ammeter which is electrically connected in a negative voltage side current path ("lowside" current path) of one of the two inverters and is adapted to measure a phase current flowing through this negative voltage side current path.

In this case, each of the second windings of the second winding system is formed in pairs symmetrically with respective corresponding ones of the first windings of the first winding system and inverted relative to the respective corresponding one of the first windings electrically connected to the respective corresponding second phase line (esp.

The invention is based on the idea that an electric drive arrangement, in particular for the operation of a hybrid electric / electric vehicle, contains a three-phase machine, which i. d. R. is controlled by means of space vector modulation. For this purpose, in particular phase currents have to be measured to the three-phase machine. A cost-effective alternative to cost-intensive Hall sensors for current measurement are shunts. In order to avoid additional potential separation and the costs associated therewith, the shunts are placed, for example, between the negative potential of an intermediate circuit of the drive arrangement and each negative-voltage-side power semiconductor switch (so-called "low-side" power measurement). The disadvantage of this "lowside" current measurement compared to the phase current measurement is that the phase current can only be measured if its "low-side" switch is currently conducting the phase current. At high modulation levels, depending on the stator angle, most of the phases only conduct the phase currents over the "lowside" current path for a very short time. Since in a three-phase star connection at least two phase currents must be measured simultaneously in order to calculate the third phase current via the node equation, the minimally required settling time of the evaluation circuit of the shunts thus limits the maximum possible degree of modulation.

By using a three-phase machine with at least two separate star circuits of windings (separate subsystems), the engine power can be increased by two separate subsystems and thus by increased voltage utilization, without increasing the space of the three-phase machine. In this case, the mutually corresponding windings of the star circuits are placed in respective identical grooves.

Due to the inverted symmetrical structure of the two star circuits and the easily executable, exactly the same control (mutually inverse pulse pattern for the two star circuits) result in the respective grooves exactly the same electrical currents, whereby on the one hand the effects of the magnetic coupling between the star circuits is minimized and on the other hand, the phase currents of the two star circuits in magnitude are approximately equal.

The use of the above-mentioned double-star three-phase machine can increase the voltage utilization and thus significantly increase the motor power without increasing the number of power semiconductor switches. The associated additional effort to control the power semiconductor switches is manageable.

Through the use of at least two separate, inverted star circuits in a three-phase machine and the corresponding (inverse) control of the power semiconductor switches of the inverter, the limitation of the maximum modulation depth can be limited by a "lowside" current measurement, so that the maximum system performance and the System efficiency of the drive assembly can be largely maintained.

In summary, the solution described above allows a system cost reduction at a constant or increased power by a clever combination of "lowside" current measurement, three-phase machine with two mutually inverted symmetrically formed or connected winding systems and thus enabled each other inverse control of the star circuits.

Thanks to the "lowside" current measurement and the associated long settling time of the evaluation circuit, comparatively favorable components for the evaluation circuit of the current measurement can be selected.

Since at least one phase current can be measured in at least one of the two winding systems in each switching period, a modulation method in the overmodulation range up to the block operation can also be realized. Thus, no complex model for current prediction in the overmodulation range has to be created and tested (for time ranges in which otherwise only 1 of 3 phase currents can be measured), which from a functional safety standpoint is problematic anyway. Thus, the voltage utilization can be fully utilized and the system performance and system efficiency can be maximized.

This makes it possible to optimize an electrical drive arrangement in terms of cost and functionality.

The electric drive arrangement described above can be used in a 48 volt electrical system for driving a hybrid electric / electric vehicle.

The aforesaid negative-voltage-side current path ("lowside" current path) of an inverter is, for example, a current path between a negative-voltage-side semiconductor switch of one of the half-bridges of the inverter and a negative-voltage-side current connection or the ground-current connection of the inverter.

For example. the first windings of the first winding system and the respective second windings of the second winding system corresponding to these first windings are arranged in pairs in one and the same winding groove, or in two adjacent winding grooves, or in two mutually corresponding winding grooves of the three-phase machine. Thus, the mutually symmetrical and mutually inverted connected and thus mutually corresponding pairs of windings of the two winding systems are arranged in pairs in one and the same winding groove, or in two adjacent winding grooves, or in two mutually corresponding winding grooves of the three-phase machine.

For example. For example, the first and second winding systems are each configured as a star connection. The windings of the first star connection and the corresponding windings of the second star connection are wound in pairs in one and the same winding groove, or in two adjacent winding grooves, or in two mutually corresponding winding grooves of the three-phase machine, but the second windings are opposite the second star connection inverted connected to the respective corresponding, first windings of the first star connection.

Alternatively, the first and the second winding system, for example, each formed as a delta connection.

For example. In particular, in the case where the two winding systems are designed as star circuits, the first windings each have a first winding end, wherein the first winding ends of the first windings are electrically connected to each other (especially directly) and thus the star point of the first winding system or train the first star connection. Analogously, the second windings, for example, each have a first winding end corresponding to the respective first winding end of the respective corresponding first windings, wherein the first Winding ends of the second windings are each electrically connected to one of the respective corresponding phase lines of the second inverter (esp. Direct).

For example. The first windings each have a second winding end opposite the corresponding first winding end, wherein the second winding ends of the first windings are electrically connected (in particular directly) to one of the respective corresponding phase lines of the first inverter. Analogously, the second windings have, for example, in each case a second winding end opposite the corresponding first winding end, the second winding ends being electrically connected to one another (in particular directly) and thus forming the neutral point of the second winding system or the second star connection.

The star points of the two winding systems or star circuits are not directly connected to each other electrically. That is, the two star points are electrically connected only via the respective phase lines and further via the two inverters.

For example. The drive arrangement further comprises an operation control unit for operating or controlling the two inverters, which is set up to drive the first inverter with a first pulse pattern and the second inverter with a second pulse pattern, the two pulse patterns being inverse to each other. Here, a pulse pattern means a waveform of a signal, esp. Positions and duration of pulses of a pulse width modulated signal in the respective signal periods, for operating the semiconductor switches of the respective winding systems or star circuits. The term "pulse pattern to each other inverse" means that the signal waveforms, esp. The positions and the duration of pulses of the two pulse width modulated signals or their pulse or signal edges in the respective corresponding signal periods are inverse to each other or inverse.

For example. the operation control unit is further configured to operate the two inverters with pulse width modulated (and mutually inverse) control signals.

For example. the current meter is further arranged to measure the phase current at the beginning of the signal period or the signal period center of the respective signal periods of the control signal.

For example. the current meter is further arranged to measure the phase current during a signal period of the control signal whose duty cycle is less than or equal to 0.5.

For example. The drive assembly further comprises at least two ammeters, each of which is electrically connected in a negative voltage-side current path in each case one of the two inverters distributed. In this case, the two current meters are set up to measure one phase current flowing through one of the negative-voltage-side current paths of the respective inverters. The operation control unit is further configured, for example, to calculate the remaining (in particular four) phase currents based on the two phase currents measured by the two current meters and to determine the pulse patterns based on the two measured and calculated phase currents.

For example. The drive assembly further comprises six ammeters each electrically connected in each of the negative voltage side current paths of each of the two inverters and configured to measure one phase current flowing through the respective corresponding negative voltage side current path of the respective inverters. In this case, for example, the operation control unit is further configured to determine the pulse patterns based on the six phase currents measured by the respective current meters.

In this case, the current meters are, for example, also configured to measure the respective phase currents at the beginning of the signal period or at the signal period center of the respective signal periods of the respective corresponding control signals. Esp. the current meters are further arranged to measure the respective phase currents during the respective signal periods of the respective corresponding control signals whose respective duty cycles are less than or equal to 0.5.

list of figures

• 1 in einer schematischen Darstellung eine Antriebsanordnung mit einer Doppelstern-Drehstrommaschine gemäß einer Ausführungsform der Erfindung;
• 2 in einer schematischen Darstellung die beiden Sternschaltungen der Doppelstern-Drehstrommaschine aus 1; und
• 3 in einem schematischen Signaldiagram Signalverläufe der Steuersignale zum Betreiben der Antriebsanordnung.

In the following, an exemplary embodiment of the invention with reference to the accompanying drawings is explained in more detail. Showing:

• 1 in a schematic representation of a drive arrangement with a double star three-phase machine according to an embodiment of the invention;
• 2 in a schematic representation of the two star circuits of the double star three-phase machine 1 ; and
• 3 in a schematic signal diagram waveforms of the control signals for operating the drive assembly.

Detailed description of the drawing:

1 shows a schematic representation of an electric drive assembly AA for driving a hybrid electric / electric vehicle according to an embodiment of the invention.

The drive arrangement AA includes a three-phase machine DM to drive the vehicle and a traction battery BT for providing the current for the three-phase machine DM ,

The drive arrangement AA further comprises a first inverter WR1 and a second inverter WR2 which are designed as voltage-fed pulse inverters.

The two inverters WR1 . WR2 have a common positive-voltage-side power connection A1 and a common negative-voltage side power connection A2 on, over which the two inverters WR1 . WR2 current input side to each other in parallel to the traction battery BT are electrically connected.
The first inverter WR1 For its part, it comprises three first half-bridges which are parallel to one another and between the two power connections A1 . A2 are electrically connected. The three first half bridges each include a positive voltage side power semiconductor switch S11 . S13 . S15 and a negative voltage side power semiconductor switch S12 . S14 . S16 which are each connected in pairs to each other in series and via respective center tap electrically connected to each other.

The first inverter WR1 also includes three phase lines Pu . pv . pw which respectively at the center taps of the corresponding half-bridges of the first inverter WR1 are electrically connected and for providing phase currents for the three-phase machine DM serve.

The first half bridges further each include an ammeter SM12 . SM14 . SM16 , Which in each case between the negative voltage side power connection A2 and the negative voltage side power semiconductor switch S12 . S14 . S16 the respective first half-bridges are electrically connected in series.

Analogously, the second inverter comprises WR2 three second half bridges, which are also parallel to each other and between the two power terminals A1 . A2 and thus are also electrically connected in parallel to the three first half-bridges. The three second half bridges also each comprise a positive voltage side power semiconductor switch S21 . S23 . S25 and a negative voltage side power semiconductor switch S22 . S24 . S26 , which are electrically connected to each other in series and via respective center tap.

The second inverter WR2 also includes three phase lines px . Py . pz which respectively at the center taps of the corresponding half-bridges of the second inverter WR2 are electrically connected and for providing further phase currents for the three-phase machine DM serve.

The second half bridges also each comprise an ammeter SM22 . SM24 . SM26 , Which in each case between the negative voltage side power connection A2 and the negative voltage side power semiconductor switch S22 . S24 . S26 the respective second half-bridges are electrically connected in series.

The electricity meters SM12 . SM14 . SM16 . SM22 . SM24 . SM26 each comprise a shunt, which in the respective half-bridges negative voltage side (between the respective negative voltage side power semiconductor switch S12 . S14 . S16 . S22 . S24 . S26 and the negative voltage side power connector A2 ) are electrically connected and adapted to measure currents (or phase currents) which flow on the negative voltage side through the respective half-bridges ("low-side" current measurement).

Through the "Lowside" current measurement or the negative voltage side arrangement of the ammeters SM12 . SM14 . SM16 . SM22 . SM24 . SM26 or the shunts an undesired potential separation in the half-bridges is avoided. The disadvantages associated with the "lowside" current measurement compared to a phase current measurement is explained by the activation of the power semiconductor switches to be described below S11 . S13 . S15 . S12 . S14 . S16 . S21 . S23 . S25 . S22 . S24 . S26 or the selection of measuring times avoided.

The drive arrangement AA further comprises an intermediate circuit capacitor C which is between the two power connections A1 . A2 and thus parallel to the two inverters WR1 . WR2 electrically connected.

The three-phase machine DM is designed as a permanent magnet double-star synchronous machine and comprises a stator with a first star connection SS1 and a second star connection SS2 ,

The two star circuits SS1 . SS2 are in 2 shown schematically in detail.

The first star connection SS1 includes three first windings U . V . W which of each other each offset by 120 ° in respective winding grooves are arranged on the stator.
This is shown by the first windings U . V . W in each case a first winding end Ue1 . Ve1 . We1 on, wherein the first coil ends Ue1 . Ve1 . We1 are electrically connected to each other and the star point X1 the first star connection SS1 form.

Furthermore, the first windings U . V . W in each case a second, the respective corresponding first winding end Ue1 . Ve1 . We1 opposite winding end Ue2 . ve 2 . We2 on. Here are the second winding ends Ue2 . ve 2 . We2 the first windings U . V . W each directly to one of the respective corresponding phase lines Pu . pv . pw of the first inverter WR1 electrically connected.

The second star connection SS2 includes three second windings X . Y . Z , which also each offset by 120 ° in the respective winding grooves on the stator and each of the three windings U . V . W the first star connection SS1 assigned and thus with these corresponding windings U . V . W mechanically bundled in pairs, but arranged electrically isolated from each other.

In this case, the second windings X . Y . Z in each case a first winding end Xe1 . Ye1 . ze1 on, which in each case with the respective first winding end Ue1 . Ve1 . We1 the respective first windings U . V . W corresponds. In this case, the respective first winding end Xe1 . Ye1 . ze1 the second windings X . Y . Z in respective equal portions of the respective corresponding winding grooves as the respective corresponding first winding end Ue1 . Ve1 . We1 the respective corresponding first windings U . V . W and thus in close proximity to these respective corresponding first coil ends Ue1 . Ve1 . We1 arranged. This first winding end Xe1 . Ye1 . ze1 the second windings X . Y . Z are each directly to one of the respective corresponding phase lines px . Py . pz of the second inverter WR2 electrically connected.

Furthermore, the second windings X . Y . Z in each case a second, the respective corresponding first winding end Xe1 . Ye1 . ze1 opposite winding end Xe 2 . Ye2 . ze2 on, which in each case with the respective second winding end Ue2 . ve 2 . We2 the respective first windings U . V . W corresponds. In this case, the respective second winding end Xe 2 . Ye2 . ze2 the second windings X . Y . Z in respective equal portions of the respective corresponding winding grooves as the respective corresponding second winding end Ue2 . ve 2 . We2 the respective first windings U . V . W and thus in close proximity to these respective corresponding second coil ends Ue2 . ve 2 . We2 arranged. This second winding end Xe 2 . Ye2 . ze2 are electrically connected to each other and form the star point X2 the second star connection SS2 out.

This is the two star circuits SS1 . SS2 symmetrical to each other yet inverted connected to each other. There are the windings U . V . W ; X . Y . Z the two star circuits SS1 . SS2 made of the same materials, such. B. from the same copper wires or copper rods with the same insulating layers, and have the same electrical and mechanical properties, such as. B. from the same winding wires or winding rods in the same lengths and the same cross-sections and the same dielectric strength, etc. in the same number of turns, etc., and thus the same phase resistances. This causes the windings U . V . W the first star connection SS1 in their electrical and mechanical, esp. in their electromagnetic, property largely identical to the corresponding windings X . Y . Z the second star connection SS2 executed.

Thereby the two star circuits SS1 . SS2 formed symmetrically to each other and inverted connected and together form an "inverted double star three-phase machine". The "inverted double-star three-phase machine" results from the inverted connection of the two star circuits SS1 . SS2 ,

The drive arrangement AA further comprises an operation control unit BK for controlling the power semiconductor switches S11 . S13 . S15 . S12 . S14 . S16 . S21 . S23 . S25 . S22 . S24 . S26 the two inverters WR1 . WR2 and thus to the operation of the three-phase machine DM ,

The operation control unit BK is control signal output side with respective control terminals of the power semiconductor switches S11 . S13 . S15 . S12 . S14 . S16 . S21 . S23 . S25 . S22 . S24 . S26 signal technically connected and set up in the manner to be described below with pulse-width modulated control signals AS11 . AS13 . AS15 . AS12 . AS14 . AS16 . AS21 . AS23 . AS25 . AS22 . AS24 . AS26 the corresponding power semiconductor switches S11 . S13 . S15 . S12 . S14 . S16 . S21 . S23 . S25 . S22 . S24 . S26 and thus the two inverters WR1 . WR2 inverse controlled to switch.

After the construction of the drive assembly AA based on 1 and 2 has been described in detail, their operation or their control is based on 3 described in more detail.

The operation of the drive assembly AA or the three-phase machine DM by means of the two inverters WR1 . WR2 is done using the pulse width modulated control signals AS11 . AS13 . AS15 . AS12 . AS14 . AS16 . AS21 . AS23 . AS25 . AS22 . AS24 . AS26 generated by the operation control unit BK and the control terminals of the respective corresponding power semiconductor switches S11 . S13 . S15 . S12 . S14 . S16 . S21 . S23 . S25 . S22 . S24 . S26 be created.

In this case, the control of the lathe DM takes place, for example, by means of space vector modulation, wherein the phase currents required for space vector modulation of the respective phase lines Pu . pv . pw . px . Py . pz on the basis of the respective negative voltage side connected ammeters SM12 . SM14 . SM16 . SM22 . SM24 . SM26 be measured.

In 3 In each case one signal period of the first control signals is illustrated AS11 . AS13 and AS15 for driving the positive voltage side power semiconductor switch S11 . S13 . S15 of the first inverter WR1 , and each one signal period of the second control signals AS21 . AS23 and AS25 for driving the positive voltage side power semiconductor switch S21 . S23 . S25 of the second inverter WR2 shown schematically as a comparison.

In this case, the second control signals AS21 . AS23 and AS25 to the respective corresponding first control signals AS11 . AS13 and AS15 exactly inverse pulse patterns. Thus, the mutually corresponding power semiconductor switches S11 and S21 . S13 and S23 . S15 and S25 . S12 and S22 . S14 and S24 . S16 and S26 the two inverters WR1 . WR2 and thus also the two star circuits SS1 . SS2 exactly inverse to each other.

Due to the symmetrical structure and at the same time the inverted connection of the two star circuits SS1 . SS2 as well as the exact inverse control with the mutually inverse pulse patterns of the control signals AS11 . AS13 . AS15 and AS21 . AS23 . AS25 result in the respective winding grooves of the stator exactly the same electrical currents in the individual windings U . V . W and X . Y . Z and on the one hand, the magnetic coupling between the two star circuits SS1 . SS2 minimized and secondly are the phase currents of the two star circuits SS1 . SS2 in terms of amount approximately the same size. As a result, it is sufficient, only one phase current at each of the two inverters WR1 . WR2 to measure and calculate the remaining phase currents from the two measured current values. Current readings from the remaining ammeters can serve as redundant readings to check the calculated phase current values or to monitor their operation.

To avoid or reduce harmonics in the measured phase currents and thus to increase the measurement accuracy, the starting time (t = 0) or the time center (t = T / 2) of the respective signal periods is selected as the measurement time.

The inverted structure results in pulse patterns in which at least three of six control signals Su, Sv, Sw or Sx, Sy, Sz have a duty cycle of less than or equal to 50%.

This avoids the disadvantages otherwise associated with "low side" current measurement.

Esp. For example, two or more phase currents can be measured at the same time and in a longer time phase by the embodiment described above in the respective switch periods even with large degrees of modulation. A restriction of the maximum degree of modulation by a "lowside" current measurement and thus also the maximum system performance and the system efficiency can thus be avoided.

This allows a system cost reduction with a simultaneous increase in performance.

• - Durch die lange Einschwingdauer der Auswerteschaltungen der „Lowside“-Strommessung können günstigere Bauteile für Strommessung ausgewählt werden;
• - Durch die Aufteilung der Leistungshalbleiterschalter S11, S13, S15, S12, S14, S16, S21, S23, S25, S22, S24, S26 auf sechs Phasen von zwei Sternschaltungen SS1, SS2 statt drei Phasen einer Sternschaltung können diese besser ausgenutzt werden. Dadurch ergibt sich eine höhere Systemleistung bei der gleichen Gesamtanzahl der Leistungshalbleiterschalter;
• - Da in jeder Schaltperiode mindestens bei einer Sternschaltung SS1 und/oder SS2 mindestens zwei Phasenströme gemessen werden, können auch Modulationsverfahren im Übermodulationsbereich bis hin zum Blockbetrieb realisiert werden. Es muss also kein aufwändiges Modell zur Stromprädiktion im Übermodulationsbereich erstellt und getestet werden (für die Zeitbereiche, in der sonst nur einer von den drei Phasenströmen gemessen werden kann), welches ohnehin problematisch ist aus der Sicht der funktionalen Sicherheit. Somit kann die Spannungsausnutzung voll ausgeschöpft werden und die Systemleistung sowie der Systemwirkungsgrad maximiert werden.

By the combination of the mutually inverted connection of the two symmetrically constructed star circuits SS1 . SS2 the binary star three-phase machine DM , the "Lowside" current measurement with the negative current side connected ammeters SM12 . SM14 . SM16 . SM22 . SM24 . SM26 , as well as the previously described inverse control of the two star circuits SS1 . SS2 Among other things, the following advantages result:

• - Due to the long settling time of the evaluation circuits of the "Lowside" current measurement, more favorable components for current measurement can be selected;
• - By the division of the power semiconductor switch S11 . S13 . S15 . S12 . S14 . S16 . S21 . S23 . S25 . S22 . S24 . S26 on six phases of two star circuits SS1 . SS2 Instead of three phases of a star connection, these can be better utilized. This results in a higher system performance with the same total number of power semiconductor switches;
• - Since in each switching period at least one star connection SS1 and or SS2 At least two phase currents can be measured, modulation methods in the overmodulation range up to the block operation can be realized. Thus, no elaborate model for current prediction in the overmodulation range has to be created and tested (for the time ranges in which only one of the three phase currents can otherwise be measured), which is problematic anyway from the point of view of functional safety. Thus, the voltage utilization can be fully exploited and the system performance and system efficiency can be maximized.

Claims (10)

Electric drive arrangement (AA), in particular for the operation of a hybrid electric / electric vehicle, comprising: - A three-phase machine (DM) having a first winding system (SS1) with at least three first windings (U, V, W) and a second winding system (SS2) with at least three second windings (X, Y, Z); - A first inverter (WR1) having at least three first phase lines (Pu, Pv, Pw), wherein the first phase lines (Pu, Pv, Pw) are each electrically connected to the respective corresponding first windings (U, V, W); a second inverter (WR2) having at least three second phase lines (Px, Py, Pz), the second phase lines (Px, Py, Pz) being respectively electrically connected to the respective corresponding second windings (X, Y, Z); - At least one current meter (SM12, SM24), which is electrically connected in a negative voltage side current path of one of the two inverters (WR1, WR2) and is adapted to measure a current flowing through this negative voltage side current path phase current; - Wherein each of the second windings (X, Y, Z) with respective corresponding one of the first windings (U, V, W) is formed in pairs symmetrically and with respect to the respective corresponding one of the first windings (U, V, W) inverted with the respective corresponding second phase line (Px, Py, Pz) is electrically connected. Drive arrangement (AA) after Claim 1 in which the first windings (U, V, W) and the respective corresponding second windings (X, Y, Z) are arranged in pairs in one and the same winding groove, or in two adjacent winding grooves, or in two mutually corresponding winding grooves of the three-phase machine (DM ) are arranged. Drive arrangement (AA) after Claim 1 or 2 , wherein the first (SS1) and the second (SS2) winding system are each formed as a star connection or in each case as a delta connection. Drive arrangement (AA) after Claim 3 , wherein the first windings (U, V, W) each have a first winding end (Ue1, Ve1, We1), wherein the first winding ends (Ue1, Ve1, We1) of the first windings (U, V, W) are electrically connected to each other are connected and thus form the neutral point (XI) of the first winding system (SS1); and - the second windings (X, Y, Z) each have a first winding end (Xe1, Ye1, Ze1) corresponding to the respective first winding end (Ue1, Ve1, We1) of the respective corresponding first windings (U, V, W) wherein the first winding ends (Xe1, Ye1, Ze1) of the second windings (X, Y, Z) are each electrically connected to one of the respective corresponding phase lines (Px, Py, Pz) of the second inverter (WR2). Drive arrangement (AA) after Claim 4 , wherein the first windings (U, V, W) each have a second winding end (Ue2, Ve2, We2) lying opposite the respective corresponding first winding end (Ue1, Ve1, We1), the second winding ends (Ue2, Ve2 , We2) of the first windings (U, V, W) are each electrically connected to one of the respective corresponding phase lines (Pu, Pv, Pw) of the first inverter (WR1); and - the second windings (X, Y, Z) each have a second winding end (Xe2, Ye2, Ze2) opposite the corresponding first winding end (Xe1, Ye1, Ze1), the second winding ends (Xe2, Ye2, Ze2 ) are electrically connected to each other and thus form the neutral point (X2) of the second winding system (SS2). Drive arrangement (AA) according to one of the preceding claims, further comprising an operation control unit (BK) for operating the two inverters (WR1, WR2), which is arranged, the first inverter (WR1) with a first pulse pattern (AS11, AS13 and AS15) and to drive the second inverter (WR2) with a second pulse pattern (AS21, AS23 and AS25), wherein the two pulse patterns (AS11, AS13 and AS15 or AS21, AS23 and AS25) are mutually inverse. Drive arrangement (AA) after Claim 6 , wherein the operation control unit (BK) is further configured to operate the two inverters (WR1, WR2) with pulse width modulated control signals. Drive arrangement (AA) after Claim 7 wherein the ammeter (SM12, SM24) is further arranged to measure the phase current at the signal period beginning (T0) or the signal period center (Tm) of the respective signal periods of the control signal. Drive arrangement (AA) after Claim 7 or 8th wherein the ammeter (SM12, SM24) is further arranged to measure the phase current during a signal period of the control signal whose duty cycle is less than or equal to 0.5. Drive arrangement (AA) according to one of the preceding claims, further comprising six ammeters (SM12, SM14, SM16, SM22, SM24, SM26), which are electrically connected in each of the negative voltage side current path in each case one of the two inverters (WR1, WR2) distributed and are arranged to measure a respective current flowing through the respective corresponding negative voltage side current path of the respective inverters (WR1, WR2) phase current.

Images