EP3729617A1

EP3729617A1 - Electromechanical system and superimposed gearing for transferring rotational energy

Info

Publication number: EP3729617A1
Application number: EP18826686.0A
Authority: EP
Inventors: Jörg RECKTENWALD
Original assignee: Powertrans SA
Current assignee: Powertrans SA
Priority date: 2017-12-21
Filing date: 2018-12-20
Publication date: 2020-10-28
Also published as: JP7341158B2; WO2019122224A1; DE102017130880A1; US20200403481A1; JP2021508231A

Abstract

The invention describes an electromechanical system for transferring rotational energy, torque and power in a powertrain, to which a first, a second and a third machine for energy conversion (2, 3, 4) are coupled, and a superimposed gearing (1) for a system of this kind having a planetary gearbox (7). The sun gear (8) of the planetary gearbox (7) is coupled by means of a first shaft (5) for transferring a torque to the first machine (2) and at least one planetary gear (9) is coupled by means of a second shaft (6) for transferring a torque to the second machine (3). The third machine (4) is designed as a three-phase synchronous machine. An internal gear (10) of the planetary gearbox (7) forms a rotor of the three-phase synchronous machine (4). The described technical solution is characterised in that the internal gear (10) is connected to a housing (15) of the planetary gearbox (7), and that permanent magnets (11) for exciting the three-phase synchronous machine are arranged, more particularly are fastened, on the internal gear (10) and/or on the housing (15) of the planetary gearbox (7).

Description

Electromechanical system and superposition gearbox for the transmission of

rotational energy

Description :

The invention relates to an electromechanical system for particular variable-speed transmission of rotational energy, torque and power and a superposition gear for such a system according to the independent claims. The system described has a plurality of energy conversion machines coupled to a powertrain. The single ones

Energy conversion machines can be operated by a motor or by a generator, with the speeds of the input or output shafts to which the individual machines are coupled varying. The electromechanical system has a powertrain including at least first, second, and third powertrain-coupled power conversion machines and a superposition gear having a planetary gear whose sun gear is coupled to the first engine through a first shaft for transmitting torque and the planetary gear at least one planetary gear is coupled via a second shaft for transmitting a torque to the second machine, wherein the third machine is designed as a three-phase synchronous machine and a ring gear of the

Planetary gear forms a rotor of the three-phase synchronous machine. Such an electromechanical system, which uses a three-phase synchronous machine in a differential gear for wind turbines, is known from AT 507 395 A2.

In general, plants that have different, mechanically coupled to each other machines for energy conversion, such as generators, combustion engines or turbomachinery, known. Often superposition gears are provided in such systems, with which the introduced or removed by the different machines torque can be controlled variable speed. In general, an epicyclic or planetary gear is the essential component of the superposition gear used. A planetary gear has a centrally disposed, connected to a central shaft, externally toothed sun gear, at least one meshing with the sun gear and a planetary with the at least one planet in engagement befindliches Ring gear, opposite which the at least one planetary gear performs a relative movement.

In many cases, superimposed gears are used to ensure an at least approximately constant speed despite a varying on the main drive side speed of the main drive shaft to the main output shaft. Corresponding technical solutions are needed, for example, for wind turbines to compensate for the variations in wind speed caused by fluctuations in the wind rotor and so on the one hand to protect the drive train of the wind turbine against sudden peak loads and on the other hand to allow effective operation of the generator.

In this context, DE 103 14 757 B3 describes a drive train for transmitting a variable power with variable input speed and a substantially constant output speed. It is provided as a planetary gear superposition gear is coupled to a hydrodynamic torque converter to convert the varying speed of the rotor in a constant speed of the drive shaft of a synchronous generator. The superposition gear is arranged in the drive train of the wind turbine between the main gear and synchronous generator. The output shaft of the wind rotor is connected to the planetary gears, the sun gear via the impeller of the torque converter to the generator shaft and the ring gear to the turbine of the torque converter. The braking effect of the torque converter is changed by means of specifically adjustable guide vanes. A disadvantage of the technical solution described on the one hand that speed converter have a relatively complex structure and on the other hand, that occur due to the systemic hydraulic slip just in significant for the efficiency of a wind turbine partial load range high losses. Incidentally, from the article "variable speed wind turbines with electrically controlled superposition gearbox" by P. Caselitz et al., Conference tape "DEWEK '92", p. 171-175 "the use of an electrically controlled, in turn designed as planetary gear superposition gearbox for variable speed operation known from wind turbines. The technical solution described is based on the speed variability, ie the targeted change in the speed ratio between the rotor and generator of the wind turbine, not in the electrical but in the mechanical part of the plant produce. For this purpose, the shaft connected to the ring gear of the planetary gear is driven as needed with the aid of a converter-fed asynchronous machine with squirrel cage.

Starting from the known from the prior art technical solutions for speed variation in drivelines, which have different, rotational energy receiving or donating machines for energy conversion, the invention has for its object to provide a system that has a relatively simple structure is robust and Dynamic loads of the drive train minimized. The system should also be suitable for advantageous use in different technical fields, in particular to enable both an effective regenerative and motor operation. Furthermore, the supply of electrical energy in a power grid should be possible as effectively and largely without the use of complex electronics and other control technologies.

The above object is achieved with an electromechanical system for transmitting rotational energy according to claim 1 and a superposition gear according to claim 12. Advantageous embodiments of the invention are the subject of the dependent claims and are explained in more detail in the following description with partial reference to the figures.

The invention relates to an electromechanical system for the transmission of rotational energy, torque and power in a drive train having at least a first, a second and a third coupled to the drive train engine for energy conversion and with a planetary gear superposition gear, with the three machines in Active compound is. The sun gear of the planetary gear is coupled via a first shaft for transmitting a torque to the first machine and at least one planetary gear via a second shaft for transmitting a torque to the second machine. The third machine is designed as a three-phase synchronous machine. A ring gear of the planetary gear forms a rotor of the three-phase synchronous machine, which is referred to in the following description for better readability as a synchronous machine. The invention is characterized in that the ring gear with a housing the planetary gear is connected, and that arranged on the ring gear and / or on the housing of the planetary gear permanent magnets for exciting the three-phase synchronous machine, in particular fixed, are.

The synchronous machine is operated as a function of the respective operating state by motor or generator, so that a braking torque or an acceleration torque is introduced into the ring gear of the planetary gear as needed. The suitable control of the synchronous machine takes place in an advantageous manner with the aid of drive electronics, which generates a control signal on the basis of the respective operating situation, thus taking into account in particular the rotational speeds of the sun gear and / or the at least one planetary gear or the shafts coupled to these gear wheels. For example, if the rotational speed of the shaft on the main drive side of the planetary gear is too low with respect to the required on the main output side speed, the synchronous machine can initiate a suitable acceleration torque in the ring gear. It is also conceivable that the ring gear is fixed by the synchronous machine in position or even that the ring gear is rotated in the reverse direction. In principle, it is conceivable to design the planetary gear in one or more stages. Furthermore, the planetary gear can be coupled to another gear, such as a main drive gearbox of a wind turbine or a transmission gearbox of a work or machine tool.

According to a particular embodiment of the invention, the third machine is designed as a permanent magnet synchronous machine and the rotatably mounted ring gear of the planetary gear is in operative connection with the permanent magnet for exciting the synchronous machine. The permanent magnet synchronous machine is preferably a higher-pole synchronous machine which has more than two, in particular four, poles.

In general, it is conceivable that the ring gear itself forms the rotor of the synchronous machine and the permanent magnets are arranged directly on the ring gear, in particular fixed. Preferably, however, it is provided that the ring gear is connected to the housing of the planetary gear and the permanent magnets arranged on the ring gear and / or the housing, in particular are fixed.

In a further embodiment of the invention, the synchronous machine is controlled by a drive electronics for controlling the energy conversion realized in the synchronous machine. In this context, energy conversion is understood to be, above all, the conversion of electrical energy into rotational energy in motor operation and of rotational energy into electrical energy in regenerative operation. Advantageously, a drive electronics is provided, which is designed such that the energy conversion takes place in the synchronous machine at least temporarily as a function of the energy converted by the first and / or second machine or the respective output or recorded by these power.

Also with regard to the first and the second machine for energy conversion, it is conceivable that the machines are operated either as a generator or as a motor. The superposition gearing designed according to the invention as a planetary gearing is connected to a main drive shaft and a main drive shaft of a drive train, wherein the main drive shaft or the main output shaft is connected either to the central shaft connected to the sun gear or to the at least one planetary gear via the web Stegwelle acts. In this way, it is possible that a motor or generator via a drive shaft or in generator mode via an output shaft is directly or indirectly connected to the sun gear. The at least one planetary gear or preferably a plurality of planetary gears is or are connected to the web shaft, which directly forms the output shaft during engine operation or is connected to at least one further output stage. In regenerative operation, the power flow rotates and the ridge wave is driven directly or indirectly and transmits torque, rotational energy and power to the at least one planetary gear.

Incidentally, it is particularly advantageous for the overall system, in particular the efficiency or the efficiency and the minimization of electrical losses, that the drive electronics is designed such that the synchronous machine is operated at least temporarily in 4-quadrant operation. Furthermore, it is provided in a particular embodiment of the invention that the drive electronics is designed such that an air gap torque of the synchronous machine is variable depending on the provided and removed from the first and / or second machine power. With the aid of an appropriately provided adjusting device, it is possible to selectively vary the magnetic flux between stator and rotor and the power consumption or power output of the rotor of the coupled to the ring gear of the planetary gear synchronous machine.

In a particularly preferred manner, the planetary gear is arranged with at least one further transmission in a common oil chamber. In this context, it is conceivable that the further transmission is coupled to the planetary gear and disposed between the planetary gear and the first or the second machine, and these two gears are arranged in a common oil chamber, ie in a sealed housing to the outside oil-tight. In this way, on the one hand, a particularly space-saving arrangement of planetary gear and at least one additional transmission possible, on the other hand, the number of in the overall system or overall drive train provided sealing surfaces and thus minimizes the number of seals and maintenance points.

According to a further embodiment of the invention it is provided that the first or the second machine is designed as a three-phase asynchronous machine connected to a power supply. It is advantageous in this context, when the first or the second machine is connected to a power grid. The three-phase asynchronous machine provided for this purpose can operate in both motor and generator mode. Thus, it is conceivable, for example, that a three-phase asynchronous generator converts the power output by a wind rotor or a wind turbine into electrical energy and feeds it into the connected power grid. Essential for the drive train according to the invention is in this case that despite the speed changes on the drive side, so the side of the drive train on which the wind rotor is located, the output side, and thus on the generator side, located generator shaft rotates with an at least approximately constant speed.

But it can also be used as the first or second machine, a foreign-excited or permanent magnet synchronous machine. In this case, the generator shaft must be synchronized with the mains frequency via the number of pole pairs.

According to an alternative embodiment of the invention, the first machine is a three-phase asynchronous motor which drives a machine tool or a working machine, in particular in mining, via a drive train with the superposition gearbox designed according to the invention. In this case, changes in load on the working machine side, which are caused, for example, by changes in the loads on the tool, are initiated in a targeted manner via the superposition gear and in particular the ring gear in the synchronous machine coupled thereto. In addition, a smooth and controlled start-up of a work machine can be realized by the output power in the drive train controlled by the movement of the ring gear driven synchronous machine, which then works as a generator, is converted into electrical energy at the start of the induction motor, which again in the connected network is delivered.

In order to use a drive train designed according to the invention in explosive or impact-resistant areas, the individual components of the system, such as motor, frequency converter and permanent-magnet synchronous machine, are designed to be explosion-proof or impact-resistant.

Further embodiments of the invention provide that the first or the second machine as an internal combustion engine or turbomachine, for example as a gas turbine, is executed. It is essential in each case that via the first and / or the second machine, a torque or a power is coupled into the drive train or absorbed by the drive train. In this context, it is conceivable to use the electromechanical system according to the invention with superposition gearing for transmitting rotational energy, torque and power for a vehicle drive train, in particular the drive train of a vehicle with hybrid drive. In such a case, a motor, in particular an internal combustion engine, is used as the first machine, wherein such an engine can generally be a diesel, petrol or gas engine. It is also conceivable to use a turbine for driving a vehicle.

In a particular embodiment of the invention, the drive train of a vehicle is configured such that the internal combustion engine or the turbine preferably runs in an energy-optimal range, while the speed adjustment of the drive shaft of the vehicle is at least partially via the coupled to the ring gear of the planetary gear permanent magnet synchronous machine. At standstill of the vehicle advantageously located in the vehicle electrical energy storage by the synchronous machine whose rotor is formed by the ring gear of the planetary gear or connected to the ring gear planetary gear, charged.

In addition to an electromechanical system for the transmission of rotational energy, the invention also relates to a superposition gear with a planetary gear and with means for the targeted distribution of an introduced into the planetary gear torque. The planetary gear has a centrally located sun gear and at least one planetary gear meshing with the sun gear, of which the sun gear is connected to a first shaft for transmitting torque and the at least one planetary gear is connected to a second shaft for transmitting torque. Further, the planetary gear has a rotatably mounted ring gear, in which the means for the targeted division of the introduced into the planetary gear torque in response to a control signal, which is preferably generated due to a current operating situation of a drive electronics, a braking or acceleration force. The means for the targeted distribution of an introduced into the planetary gear torque have a synchronous machine whose rotor is formed by the ring gear or a member connected to the ring gear. The superposition gearing according to the invention is characterized in that the ring gear is connected to a housing of the planetary gearing, on which permanent magnets are arranged. Preferably, the synchronous machine is excited by permanent magnets which are indirectly or directly connected to the ring gear. In particular, the ring gear may be connected to a housing of the planetary gear, are attached to the permanent magnets. The permanent magnets can in this case on the Housing of the planetary gear and / or the outer wall of the ring gear to be placed or embedded therein.

The inventively designed electromechanical system for the transmission of rotational energy, torque and power and suitable for the realization of a variable speed drive train to be operated superposition gear is characterized in that the ring gear is connected to a housing of the planetary gear, and that on the ring gear and / or on the housing the planetary gear permanent magnets are arranged to excite the three-phase synchronous machine. The ring gear and / or the housing of the planetary gear form the rotor of a synchronous machine. Preferably, it is a permanent magnet synchronous machine, wherein the permanent magnets are attached in particular to the ring gear and / or connected to the ring gear housing of the planetary gear. By a suitable control of the synchronous machine in dependence on operating parameters, such as speed of a main drive or main output shaft of the planetary gear, powers are introduced or removed in the drive train as a function of different load cases by the synchronous machine. If the synchronous machine receives power from the drive train, electrical energy is generated and fed into the connected power grid.

Thus, during operation of a powertrain having a superposition gearing according to the invention, it is possible for the power of the main driveline and the synchronous machine to add or subtract. In the case of subtraction, a part of the power transmitted by the main drive train or the torque is absorbed and removed by the synchronous machine, whereby due to the use of a suitable drive electronics stepless control and thus a continuous speed adjustment from the speed "0" in the motor and generator direction possible is. Only part of the power is supplied via the drive electronics, which leads to corresponding savings in the electronics.

In the following, the invention without any limitation of the general inventive concept is explained in more detail with reference to specific embodiments with reference to the figures. Showing:

Figure 1: powertrain of a wind turbine and

Figure 2: drive train of a working machine. FIG. 1 shows an electromechanical system according to the invention for transmitting rotational energy, torque and power, which is used as the drive train of a wind power plant. In particular, the system is designed for variable-speed transmission of rotational energy, torque and power. The first and second energy conversion machines 2, 3 are in this case an asynchronous generator 2 and a wind rotor 3, both of which are connected to each other via the main drive train. The wind rotor 3 of the wind power plant is connected to the asynchronous generator 2 via a rotor output shaft 14, a main transmission 12 and a superposition gear 1 connected in series therewith, designed as a planetary gear 7. The asynchronous generator 2 is connected to the power grid and converts the introduced by the wind rotor 3 in the drive train power into electrical energy. It is essential here that the wind rotor 3 and thus the rotor output shaft 14 rotate at varying speeds, while the speed of the generator shaft is at least almost constant.

It can be used instead of the asynchronous generator 2, a synchronous generator. In this case, the generator shaft must be synchronized with the mains frequency via the number of pole pairs.

The sun gear 8 of the planetary gear 7 is connected to the drive shaft 5 of the asynchronous generator 2. In addition, the planetary gears 8 revolving around the sun gear 8 are connected via the web, the web shaft 6 connected thereto and via the main gear 12 at least indirectly to the rotor output shaft 14 and the rotor 3 of the wind power plant. The planet gears 9 also move the ring gear 10 of the planetary gear 7 or are driven by the ring gear 10. The ring gear 10 is in turn connected to the housing 15 of the planetary gear 7, wherein the ring gear 10 and the housing 15 are rotatably mounted.

On the housing 15 of the planetary gear 7 and the outer wall of the ring gear 10 permanent magnets 11 are fixed such that the ring gear 10 with the housing 15 form the rotor of a higher pole permanent magnet synchronous machine, which represents a third coupled to the drive train machine for energy conversion 4. The synchronous machine 4 is controlled by a drive electronics 13 with frequency converter 16 and operated in such a manner depending on the operating situation that needs transmitted power from the synchronous machine 4 to the ring gear 10 or received by the ring gear 10. In this way it is possible, with the aid of the synchronous machine 4 as required to initiate a braking torque or an acceleration torque in the ring gear 10 and thus in the connected to the planetary gear 7 drive train. At low wind speeds and thus low power of the asynchronous generator 2 is blocked. The power generated by the wind rotor 3 is introduced in this case via the rotor output shaft 14, the main gear 12, the web shaft 6, the planetary gears 9 and the ring gear 10 in the synchronous machine 4, so that they are operated as a generator and the generated electrical energy via the drive electronics thirteenth is fed directly into the connected power grid. As soon as the rotational speed of the wind rotor 3 has approximately reached the nominal rotational speed of the generator shaft 5 of the asynchronous generator 2, its brake is released and the permanent magnet synchronous machine 4 generates an additional rotation on the generator shaft until the phase angle and rotational frequency correspond to the values present in the connected network and the generator 2 can be switched directly to the network.

Once the asynchronous generator 2 has been switched to the power grid, the permanent-magnet synchronous machine 4 is operated such that it holds only the housing 15 and the associated ring gear 10 of the planetary gear 7. In this operating state, the permanent-magnet synchronous machine 4 neither outputs power into the connected power network, nor does it absorb power to a significant degree from the power grid. This means that over a wide range, the power of the drive train with the help of the constant speed operating asynchronous generator 2 can be fed at the same time sinusoidal voltage and current waveform in the connected power grid. But it is also possible to completely stop the permanent magnet synchronous machine in this speed range of the system when the ring gear 10 is held by a suitable braking device.

Upon further increase in the rotational speed and thus the rotational speed of the wind rotor 3, for example due to gusts of wind, the additional power provided thereby in the drive train is converted by the rotation of the running as a rotor of the synchronous machine 4 ring gear 10 into electrical energy via the drive electronics 13 in the connected network is fed. In addition, stronger wind gusts can be additionally compensated by an adjustment of the air gap torque of the permanent-magnet synchronous machine 4 shown in FIG.

A particular advantage of the shown with the drive train of a wind turbine electromechanical system with superposition gear 1 is that gusts of wind lead to an additional acceleration of the rotor of the synchronous machine 4 and thus to increased power production without the overall system is mechanically overloaded. The described system behavior is thus similar to that of wind turbines connected to double-fed asynchronous generators, but avoids their disadvantages, such as the use wear-resistant carbon brushes and the lack of support of the connected power grid.

In Figure 2, the use of an inventively designed electromechanical system with superposition gear 1 for transmitting torque, rotational energy and power in a drive train of a work machine, as used, for example, in mining, is shown. In particular, the system is designed for variable-speed transmission of torque, rotational energy and power. The drive train according to FIG. 2 has an asynchronous motor forming the first machine for energy conversion 2, which is directly connected to the power supply, and the working machine, which according to this embodiment represents the second power conversion machine 3 coupled to the main drive train. If a corresponding powertrain is used in mining or in other potentially explosive areas, all parts of the plant, in particular the electric motors and generators used, must be explosion-proof or flame-proof.

In comparison to the drive train explained in connection with FIG. 1, identical or at least similar components are used except for the wind rotor, although the power flow in the drive train runs in the opposite direction, namely from the asynchronous motor 2 via the engine output shaft 5, the superposition gear 1 designed as planetary gear 7 , The web shaft 6, an additional gear 12 and the drive shaft 17 of the working machine 3 to the work machine 3. Advantageous to the illustrated embodiment is that the working as a motor asynchronous machine 2 can be connected directly to the mains. While the asynchronous machine 2 is connected to the grid, at the same time in the air gap of the pe rm a nte excited n synchronous machine, which represents the third coupled to the drive train machine for energy conversion 4, built by the drive electronics 13, a small counter-torque, so that as a runner The synchronous machine 4 executed ring gear 10 is rotated and introduced by the asynchronous machine 2 in the drive train power is fed in large part via the synchronous machine 4 and the drive electronics 13 in the form of electrical energy in the connected power grid. In this case, in particular at the beginning of the starting phase, the power output by the asynchronous motor 2 is almost completely fed back into the power grid via the synchronous machine 4. By a soft construction of the counter-torque in the synchronous machine 4 pulse-like overloads of the drive train are almost completely avoided.

After the asynchronous machine 2 and over the superposition gear 1 and a transmission gear 12 connected to this work machine 3 have reached the operating speed, the drive train thus in quasi-stationary Operation is, by adjusting a defined torque in the synchronous machine 4 with the superposition gear 1, the effect of a

Overload clutch can be achieved. An overload situation, for example, by a blockade of the working machine 3, would cause an acceleration of the rotor of the synchronous machine 4 and feed the additional power generated by the asynchronous machine 2 in the drive train directly back into the grid, without the other components of the drive train are mechanically overloaded. Since only a portion of the power is passed through the drive electronics 13, this can be adapted according to the performance and manufactured comparatively inexpensively.

S e c tio n s! i s t e:

Superposition gear

first machine: motor / generator

second machine: motor / generator

third machine: three-phase synchronous machine first shaft: drive or output shaft

second shaft: drive or output shaft

planetary gear

sun

planet

ring gear

permanent magnets

further gear stages

drive electronics

Rotor output shaft

Housing of the planetary gear

frequency converter

Drive shaft of the working machine

Claims

Patent claim:

An electromechanical system for transmitting rotational energy, torque and power in a powertrain having at least first, second and third powertrain-coupled power conversion machines (2, 3, 4) and a superposition gear (1) including a planetary gear (7), the sun gear (8) via a first shaft (5) for transmitting torque to the first machine (2) is coupled and its at least one planet gear (9) via a second shaft (6) for transmitting a torque the second machine (3) is coupled, wherein the third machine (4) is designed as a three-phase synchronous machine and a ring gear (10) of the planetary gear (7) forms a rotor of the three-phase synchronous machine (4), characterized in that the ring gear (10) with a housing (15) of the planetary gear (7) is connected, and that on the ring gear (10) and / or on the housing (15) of the planetary gear (7) permanent magnets (11) R energization of the three-phase synchronous machine arranged, in particular fixed, are.

2 system according to claim 1, characterized in that the three-phase synchronous machine (4) is designed as a permanent magnet three-phase synchronous machine and the ring gear (10) of the planetary gear (7) with the permanent magnet (11) for energizing the three-phase synchronous machine (4). is in active connection.

3. System according to one of claims 1 or 2, characterized in that the three-phase synchronous machine (4) is coupled to a drive electronics (13) for controlling the energy conversion and the drive electronics (13) is designed such that the energy conversion in the three-phase current - Synchronous machine (4) in dependence of the first and / or second machine (2, 3) converted energy.

4. System according to claim 3, characterized in that the drive electronics (13) is designed such that the three-phase synchronous machine (4) is operated at least temporarily in 4-quadrant operation.

5. System according to claim 3 or 4, characterized in that the drive electronics (13) is designed such that in dependence of the first and / or second machine (2, 3) converted energy, an air gap torque of the three-phase synchronous machine (4) is changed at least temporarily.

6. System according to any one of the preceding claims, characterized in that between the planetary gear (7) and the first and / or the second machine (2, 3) at least one further gear (12) is arranged.

7. System according to any one of the preceding claims, characterized in that the planetary gear (7) with at least one further gear (12) is arranged in a common oil chamber.

System according to one of the preceding claims, characterized in that the first or the second machine (2, 3) is designed as a three-phase asynchronous machine connected to a power supply.

System according to one of the preceding claims, characterized in that the first or the second machine (2, 3) is designed as an internal combustion engine, turbomachine, wind rotor or as a wind turbine.

10. Overhead gear (1) with a planetary gear (7) and with means for targeted distribution of a in the planetary gear (7) introduced torque, wherein the planetary gear (7) via a centrally disposed sun gear (8) and at least one with the sun gear (8 ) in engagement with the planetary gear (9) and the sun gear (8) with a first shaft (5) for transmitting a torque and the at least one planetary gear (9) with a second shaft (6) for transmitting a torque is connected and wherein Ring gear (10) of the planetary gear (7) is rotatably mounted and the means for the targeted division of the in the

Planetary gear (7) introduced torque in response to a control signal, which is generated due to a current operating situation of a drive electronics (13), a braking or acceleration torque in the ring gear (10) initiates, wherein the means for targeted division of a in the planetary gear (7 ) introduced torque via a three-phase

Synchronous machine (4) whose rotor is formed by the ring gear (10) or a component connected to the ring gear (10), characterized in that the ring gear (10) is connected to a housing (15) of the planetary gear (7), where the permanent magnets (11) are arranged.