Energy supply for a multiphase drive

Abstract

The invention relates to an energy supply device (1) for a multiphase drive (10), wherein the energy supply device (1) is designed to generate a DC voltage from an input voltage, in particular an AC voltage of an energy supply network, which is applied to a network connection point (2), said DC voltage being used to feed the multiphase drive (10), wherein the multiphase drive (10) has a DC input voltage of less than 100 V and a rated power of more than 300 kW, in particular more than 1 MW, wherein the energy supply device (1) comprises a voltage transformer (4), wherein the energy supply device (1) comprises a line route section (3) for transmitting electrical energy by means of DC voltage to the multiphase drive (10) at a rated voltage of less than 100 V. The invention also relates to a multiphase drive system (100) comprising an energy supply device (1) of this type and a multiphase drive (10) having an input voltage of less than 100 V and a rated power of more than 300 kW, in particular more than 1 MW. The invention further relates to a ship (20), a wind power installation (21), a compressor system (22) and a pump system (23) having a multiphase drive system (100) of this kind.

Description

[0001] Description

[0002] Power supply for a multiphase drive

[0003] The invention relates to a power supply device for a multiphase drive, wherein the multiphase drive has an input voltage of less than 100 V and a rated power of more than 300 kW, in particular more than 1 MW. Furthermore, the invention relates to a multiphase drive system having such a power supply device and a multiphase drive. The invention further relates to a ship, a wind turbine, a compressor system, or a pumping system having such a multiphase drive system.

[0004] A wide variety of electrical machines with three-phase connections are currently available on the market. The stator bars are interconnected in such a way that they form windings and are connected to the phase terminals. Instead of bars, the stator can also be formed by parallel conductors, particularly copper conductors, in a slot. In the following, the designation "bars" also includes the designation with several or a large number of conductors in a respective slot.

[0005] An alternative design for an electrical machine involves feeding each bar separately with a converter module. The number of phases in such an electrical machine thus corresponds to the number of slots in the stator. The converter modules provided for feeding the individual slots form a converter that is directly connected to the electrical machine and forms a functional unit with it.

[0006] Such an electrical machine with a converter constructed from converter modules is also referred to as a multiphase drive. Its input voltage is often a direct current. The magnetic field required for the operation of the electrical machine is generated by high currents in the stator bars at comparatively low voltages. Known applications in the order of approximately 50 kW draw the power required for operation directly from a battery.

[0007] The invention is based on the object of improving the energy supply of a powerful multiphase drive.

[0008] This object is achieved by a power supply device for a multi-phase drive, wherein the power supply device is set up to generate a direct voltage for feeding the multi-phase drive from an input voltage present at a network connection point, in particular an alternating voltage of a power supply network, wherein the multi-phase drive has an input direct voltage of less than 100 V and a rated power of more than 300 kW, in particular of more than 1 MW, wherein the power supply device has a voltage converter, wherein the power supply device has a line section for transmitting electrical energy by means of direct voltage to the multi-phase drive with a rated voltage of less than 100 V.Furthermore, this object is achieved by a multiphase drive system with such an energy supply device and a multiphase drive with an input DC voltage of less than 100 V and a rated power of more than 300 kW, in particular more than 1 MW, wherein the energy supply device is electrically connected to the multiphase drive, in particular to terminals of the multiphase drive. This object is further achieved by a ship according to claim 11, a wind turbine according to claim 12, a compressor system according to claim 13 and a pump system according to claim 14 with such a multiphase drive system. Further advantageous embodiments of the invention are specified in the dependent claims.

[0009] The invention is based, among other things, on the realization that a multiphase drive can be powered with low losses from a power grid instead of from a battery using the proposed power supply device. Due to the low voltage at the rods of the multiphase drive, correspondingly high currents are obtained for the required power range. In a typical application, this rod alternating voltage is approximately 22 V at approximately 600 A rod alternating current. The supply voltage of the power converter integrated in the multiphase drive on the DC side, i.e. on the direct voltage side, is then approximately V DC= 62 V . The AC voltage level at a grid connection point of an alternating current network for supplying electrical drives is 690 V for low voltage and typically 6 to 10 kV for high voltage. However, the voltage can also be any value in between, below or above this. When supplied from a direct current network, the connection to the grid connection point is preferably made at a voltage of 690 V or 5 kV . Any value in between or above is also possible. This means that the voltage of the power supply network at the grid connection point is considerably higher than the voltage level with which the multi-phase drive is fed.

[0010] The low voltages of the multiphase drive are inherently due to the fact that the electric machine of the multiphase drive is designed with a half-turn feed to the individual bars in the stator. A full turn corresponds to an arrangement of two bars as forward and return conductors.

[0011] Starting at the grid connection point of the power grid, the voltage at the grid connection point is converted by the voltage converter to a lower voltage, which can be used to power the multiphase drive. Depending on the design of the power grid, a transformer, a DC-DC converter, or a power converter can be used as a voltage converter. The power converter can convert an AC voltage from the power grid into a DC voltage for direct powering of the multiphase drive. The power converter can then also be referred to as a rectifier.

[0012] A DC-DC converter is also called a DC-DC converter, DC / DC converter or DC / DC controller.

[0013] A ship's electrical system is often designed as a medium-voltage DC system. Therefore, the multiphase drive system is particularly suitable for a ship, as conversion to a different on-board voltage can be partially eliminated. However, if the ship's electrical system is designed for a voltage of 690 V or 5 kV, for example, voltage adjustment can be achieved particularly easily using a DC voltage regulator.

[0014] The advantages associated with the proposed solution in the multiphase drive system concern not only the power supply device, but also relate specifically to the operation of the multiphase drive. A solution that is accepted by the market and attractive to the customer is a positive effect on the success of the multiphase drive.

[0015] The power supply device can be arranged outside the multiphase drive. In this case, the line section extends as far as the terminals of the multiphase drive. Alternatively, it is possible to arrange the power supply device at least partially within the multiphase drive. In this case, at least one voltage converter is arranged in the housing of the multiphase drive. This voltage converter is located on the side of the electrical machine, as viewed from the terminals of the multiphase drive. The line section then extends as far as the converter modules of the multiphase drive. The line section begins at the point at which the intended voltage for the line section is less than 100 V.

[0016] The use of such a multi-phase drive with the proposed power supply device or such a multi-phase drive system, as already described, is particularly advantageous for propelling a ship. Due to the high power and the requirement for dynamic control over a wide range of torque and speed, its use has proven advantageous. In addition, the power section with low voltage can be selected to be short. This makes it possible to exploit the advantages of the high dynamics and the wide speed and torque range for the drive. The multi-phase drive system also meets the high demands on redundancy and reliability for watercraft.Its use in wind turbines is also advantageous, as the power supply device can be located in close proximity to the multiphase drive, thus not only creating a low-loss drive, but also allowing the energy to be fed redundantly into the power grid. Furthermore, its use is also advantageous for compressor and pump systems. Not only does the reliability represent a significant competitive advantage, but the power supply to the individual rods of the electrical machine also allows for rapid response to changes in operating parameters.

[0017] In an advantageous embodiment of the invention, the cable section has a length of less than 2 m. In order to design the energy supply device with low losses, it is proposed to limit the cable section that is operated with a voltage of less than 100 V to a length of less than 2 m. The losses associated with the high currents can thus be reduced to a tolerable level. The two units, multi-phase drive and voltage converter, are electrical components that must be protected with an appropriate housing due to the rotating parts and the high voltages. The cable section represents the electrical connection or at least part of the electrical connection between these two units. Due to the low voltage of this connection, no measures need to be taken with regard to contact protection.This allows for a very high level of flexibility in the design of this connection. These can be in the form of cable connections or a busbar. The connection can be adapted to the conditions resulting from the setup of the two units, multi-phase drive and voltage converter. A special housing or cover is not required for the cable section. The short length of the cable section means that the losses of the multi-phase drive can be significantly reduced. In particular, if the power supply device is arranged in the housing of the multi-phase drive, in addition to the low losses, there is also only a minimal formation of disruptive magnetic fields.

[0018] In a further advantageous embodiment of the invention, the voltage converter is designed as a transformer or as a DC-DC converter. When supplied from an AC voltage network, the transformer represents a simple and reliable means of changing or adapting an AC voltage. Due to its iron core, the transformer is very heavy. This places particular demands on the installation site, for example special requirements on the foundation. Due to these particular requirements, the installation of the transformer is not particularly flexible. This disadvantage can be easily compensated for by the line section with only low voltage, which does not require any special precautions for contact protection, because the line section allows the transformer to be flexibly connected to the multi-phase drive.

[0019] In a direct current network, the voltage transformer can be designed as a direct current converter. The direct current converter converts a first direct current into a second direct current using semiconductors in a cost-effective and reliable manner. The direct current converter is preferably located in a switch cabinet, among other things for reasons of contact protection. The direct current converter can be located close to the network connection point. However, if this is located some distance from the multi-phase drive, it can be advantageous to arrange the direct current converter close to the multi-phase drive in order to keep the line section, which is operated at low voltage, as short as possible. The energy is transmitted from this switch cabinet to the multi-phase drive at low voltage and over a short distance via the line section.

[0020] In a further advantageous embodiment of the invention, the line section is at least partially designed as a busbar. Busbars have the advantage of being able to provide large cross-sections which have a high current-carrying capacity with low electrical losses. They are therefore particularly suitable for the design of the line section. At the same time, insulation to ensure contact protection is not required, since the voltage used is sufficiently low, particularly with regard to contact protection. This is also advantageous for the use of busbars, since these usually have no insulation on their surface. The lack of insulation also improves heat dissipation caused by electrical losses.The heat can be dissipated directly from the material of the busbar, preferably copper, to the environment without being impeded by an insulating layer. Thus, the busbar represents a particularly advantageous design for the line section, especially for use in a power supply device for multiphase drives, due to its various advantages.

[0021] In a further advantageous embodiment of the invention, the energy supply device has a further voltage converter. If the distance to be covered between the mains connection point and the multi-phase drive is long, a further voltage converter can be used to generate a further voltage level for transmitting the electrical energy. The voltage converter can be designed, for example, as a further transformer when operated on an AC voltage network or as a further DC voltage converter when operated on a DC voltage network. A voltage between 100 V and 1000 V can be provided for a further line section. This further line section is particularly suitable for transmitting energy over a distance of more than 2 m with low losses.

[0022] In particular, the additional line section allows the length of the line section with a voltage of less than 100 V to be limited to less than 2 m. For this purpose, the two voltage converters are arranged at both ends of the additional line section.

[0023] By dividing the power supply system into a single line section and a second line section, the power supply system can be particularly advantageously adapted to the conditions at the installation site. The multiphase drive can also be located away from the grid connection point. In the proposed arrangement, electrical losses are within an acceptable level. Furthermore, the transmission paths do not have voltages above 1000 V, which would disproportionately increase the insulation required to ensure contact protection. The additional voltage converter makes the power supply system particularly advantageous and flexible in its adaptation to the conditions at the installation site.

[0024] In a further advantageous embodiment of the invention, the power supply device comprises a rectifier. To supply the multiphase drive with direct current, it is advantageous to arrange a rectifier in the power supply device. This rectifier can convert an alternating current present at the grid connection point, which is optionally converted via one or more voltage converters, into a direct current to supply the multiphase drive. This allows the multiphase drive to be powered with high efficiency even from an alternating current grid.

[0025] In a further advantageous embodiment of the invention, the multi-phase drive has converter modules, wherein the converter modules are each designed to feed the bars of the stator of the multi-phase drive. By feeding the bars via the corresponding converter modules, the current per bar can be precisely adjusted. This makes it possible to specify and optimize the number of pole pairs depending on the operating point of the multi-phase drive. This allows the multi-phase drive to be operated with low losses at a favorable operating point. At the same time, the characteristic curve of the motor is increased, so that higher torques and higher speeds can be achieved.

[0026] In a further advantageous embodiment of the invention, the energy supply device has a rectifier, wherein the rectifier and at least parts of the multi-phase drive are cooled using the same cooling principle. A rectifier arranged in the energy supply device can be dispensed with if the multi-phase drive already comprises a rectifier in its functional unit. In this case, the multi-phase drive can then be fed with an alternating voltage. Furthermore, the rectifier, like the power converter, can be integrated into the housing of the multi-phase drive. In particular, the cooling can be designed as a common cooling system for the rectifier and power converter.It has also proven advantageous if the rectifier and at least parts of the multi-phase drive, such as the power converter, are cooled with the same type of cooling, for example the same air flow or the same fluid flow.

[0027] It is particularly advantageous if the rectifier and parts of the multiphase drive are cooled with a common cooling circuit. This eliminates the need for two cooling circuits. The coolant can first cool the lower-temperature components and then be directed to the higher-temperature components within the cooling circuit. This allows the cooling circuit to be easily used for different components.

[0028] In a further advantageous embodiment of the invention, the voltage converter and the line section are arranged inside a housing of the multi-phase drive. In this case, the electrical machine behaves like a motor with a connection voltage of significantly more than 100 V, for example a direct voltage of 690 V or an alternating voltage of over 1000 V. The multi-phase drive then forms a structural unit which comprises the voltage converter and the line section with a voltage of less than 100 V. The voltage conversion, for example by a direct-voltage converter or a power converter, then takes place directly in the housing of the multi-phase drive. This means that the voltage converter can also be connected to the cooling circuit of the multi-phase drive. An existing motor of conventional design can therefore be easily swapped and replaced with the multi-phase drive system.In other words, the multiphase drive system provides a connection-compatible replacement for existing motors. The invention is described and explained in more detail below with reference to the exemplary embodiments illustrated in the figures. They show:

[0029] FIG 1 to FIG 4 show exemplary embodiments of the power supply device and the multiphase drive system,

[0030] FIG 5 to FIG 7 Examples of the multiphase drive,

[0031] FIG 8 a ship,

[0032] FIG 9 a wind turbine and

[0033] FIG 10 a compressor system or pump system.

[0034] FIG. 1 shows a multi-phase drive system 100 having a power supply device 1 and a multi-phase drive 10. The power supply device 1 transmits electrical energy from a grid connection point 2 of a power supply network to terminals 13 of the multi-phase drive 10. In this exemplary embodiment, in a first step, the amplitude of an alternating voltage at the grid connection point 2 is changed by means of a voltage converter 4, which is designed as a transformer 41. A further voltage converter 6, in this example formed by two rectifiers 5 arranged in parallel, converts the alternating voltage generated by the transformer 41 into a direct voltage, which is used to supply the multi-phase drive 10.A line section 3 between the voltage converter 6 and the terminals 13 of the multiphase drive 10 is designed such that the DC voltage present there assumes a value of less than 100 V. Furthermore, the length of the line section 3 is less than 2 m to keep electrical losses low.

[0035] In addition to the electric machine 12, the multiphase drive 10 has converter modules 11 that supply electrical energy to the individual bars of the stator. The electrical energy is supplied to the multiphase drive 10 via the connections 13 of the multiphase drive 10. For the purpose of considering the losses caused by the low voltage and the high currents, the length of the cable section between the connections 13 of the multiphase drive 10 and the converter modules 11 of the multiphase drive 10 is neglected due to its small size. This size is significantly less than the length of the cable section 3.

[0036] The advantages of this arrangement lie in the fact that it is possible to specify and implement a cost-effective, reliable energy supply device 1 using the components shown, such as transformer 41 and rectifier 5. The primary side of transformer 41 must be adapted to the voltage level available to the customer at the grid connection point 2, i.e. the primary winding must be designed for the respective supply voltage of, for example, 10 kV, 6 kV or 690 V. The output voltage of the secondary winding, on the other hand, must be adapted to the DC voltage level of the multi-phase drive 10. The rectifier 5 can be attached to either the transformer 41 or the multi-phase drive 10, or it can be integrated into them.Due to the high currents inherent in the system, short cable runs must be provided in both cases from the transformer 41 to the rectifier 5 (rectifier 5 on / in the multi-phase drive 10) and / or from the rectifier 5 to the multi-phase drive 10 (rectifier 5 on / in the transformer 41). It is important that the cable section 3 with a voltage of less than 100 V is short, i.e. with a length of less than 2 m. Ideally, the components transformer 41, rectifier 5 and multi-phase drive 10 can be arranged spatially in such a way that the high DC currents are transmitted by means of short busbars. From a technical point of view, this component arrangement is preferable since no measures need to be taken to reduce AC losses in the cables when transmitting the DC currents.The size of the rectifier 5 is comparable to the size of the power converter modules 11 in the multiphase drive 10, for example, due to their similar performance. The same cooling principle can also be applied to the rectifier 5. FIG. 2 shows a further exemplary embodiment of a multiphase drive system 100 with an alternatively designed power supply device 1. To avoid repetition, reference is made to the description of FIG. 1 and to the reference symbols used there.

[0037] In this exemplary embodiment, the energy supply device 1 essentially only has the voltage converter 4, which is designed, for example, as a rectifier 5 if, for example, an alternating voltage is present at the mains connection point 2. The voltage converter 4 can also comprise a plurality of rectifiers 5, which are arranged, for example, in a series circuit and / or in parallel circuit. Alternatively, the voltage converter 4 can also be designed as a DC-DC converter 42 if, for example, a direct voltage is present at the mains connection point 2. From this rectifier 5, the electrical energy is transmitted to the terminals 13 of the multi-phase drive 10 by means of the line section 3 of less than 2 m with low losses at a direct voltage of less than 100 V.

[0038] FIG. 3 shows a further exemplary embodiment of a multiphase drive system 100 with an alternatively designed energy supply device 1. To avoid repetition, reference is made to the description of FIGS. 1 and 2 and to the reference symbols used therein.

[0039] In this exemplary embodiment, two voltage converters 4, 6 are provided. A first of the voltage converters 4 is designed as a DC-DC converter 42. Alternatively, the voltage converter 4 can also have a plurality of DC-DC converters 42. This converts a DC voltage generated by another voltage converter 6 of the two voltage converters 4, 6 into a lower voltage with which the multi-phase drive 10 is operated. This arrangement is suitable if there is a greater distance, in particular a distance of more than 2 m, between the mains connection point 2 and the multi-phase drive 10. Energy at a higher voltage can then be transmitted over a greater distance between the rectifier 5 and the DC-DC converter 42 before the DC voltage is reduced by the DC-DC converter 42 to a DC voltage of less than 100 V, with which the multi-phase drive 10 is operated at its terminals 13.In this case, too, it can be ensured that the line section 3 between the DC-DC converter 42 and the terminals 13 of the multiphase drive 10 is designed to be correspondingly short and low-loss, with a maximum length of 2 m. Additionally, a transformer 41 can also be arranged between the rectifier 5 and the grid connection point 2.

[0040] The primary side of the transformer 41 can be adapted to the voltage level available to the customer, although this is not necessarily the case. This means that the primary winding is designed for the respective supply voltage of, for example, 10 kV, 6 kV or 690 V. The rectifier 5, designed as a medium-voltage rectifier, is arranged on the secondary side of the transformer 41. In an advantageous embodiment, the transformer 41 and rectifier 5 can form a structural unit. The downstream DC-DC converter 4, 42, also referred to as a DC transformer, takes over the voltage adaptation between the medium-voltage rectifier 5 and the multi-phase drive 10. Ideally, the DC-DC converter 42 can be positioned directly on the multi-phase drive 10.This means that the electrical connection can be carried out, for example, as a cable connection from the rectifier 5 to the DC-DC converter 42 in a conventional manner and without any particular spatial proximity.

[0041] FIG. 4 shows a multi-phase drive system 100 with a power supply device 1 connected to a grid connection point 2 to which a direct voltage is applied. In this exemplary embodiment, the voltage converter 4 is designed as a direct-voltage converter 42. In addition to the direct-voltage converter 42, the power supply device 1 comprises the line section 3, which electrically connects the direct-voltage converter 42 to the terminals 13 of the multi-phase drive 10. The line section 3 has a voltage of less than 100 V and, due to its length of less than 2 m, is low-loss.

[0042] FIG. 4 also shows how the multiphase drive 10 can be supplied with power at grid connection point 2 from a customer-supplied medium-voltage network with direct voltage. Compared to the design shown in FIG. 3, the optional transformer 41 and rectifier 5, designed as a medium-voltage rectifier, are omitted. The DC-DC converter 42 can be arranged directly between grid connection point 2 and the multiphase drive 10. These medium-voltage networks, which are advantageous for the multiphase drive 10, are particularly common in marine applications.

[0043] FIG. 5 shows a multiphase drive 10. In addition to the electrical machine 12, this drive has converter modules 11. The converter modules 11 and the electrical machine 12 are arranged in the structural unit of the multiphase drive 10. Each bar of the stator of the electrical machine 12 is supplied with electrical energy by means of converter modules 11. The multiphase drive 10 is designed such that the voltage and / or current of each bar of the stator can be controlled or regulated separately by one of the converter modules 11.

[0044] FIG. 6 shows the schematic structure of such a multiphase drive 10. Electrical energy is supplied to the power converter modules 11 at the terminals 13, which are preferably arranged on the housing. The power converter modules generate the voltages and / or currents required for the regulation or control of each bar of the electrical machine 12. The voltage required for the operation of the multiphase drive 10 is a direct voltage, and the magnitude of the direct voltage is less than 100 V.

[0045] FIG. 7 shows a further exemplary embodiment for the design of a multi-phase drive 10. To avoid repetition, reference is made to the description of FIG. 6 and to the reference symbols introduced there. In this exemplary embodiment, the multi-phase drive 10 completely comprises the energy supply device 1. In other words, the energy supply device 1 is part of the multi-phase drive 10. The mains connection point 2 is connected directly to the terminals 13 of the multi-phase drive 13. Alternatively, it is also possible for a further voltage converter (not shown here) to be arranged between the mains connection point 2 and the terminals 13 of the multi-phase drive 10. In this case, the multi-phase drive 10 only partially comprises the energy supply device 1.

[0046] In this exemplary embodiment, the line section 3 extends from the voltage converter 4, which is designed as a rectifier 5, to the power converter modules 11 of the multi-phase drive 10.

[0047] FIG. 8 shows a ship 20, which is driven by the multiphase drive system 100. For this purpose, the propeller is connected to the drive shaft 101 of the electric machine 12 of the multiphase drive 10. To avoid repetition, reference is made to the description of FIGS. 1 to 7 and to the reference symbols used therein.

[0048] FIG. 9 shows a wind turbine 21, which can feed the power absorbed by the wind into a power grid by means of the multiphase drive system. For this purpose, the rotor blades are mechanically connected to the drive shaft 101 of the electric machine 12 of the multiphase drive 10. To avoid repetition, reference is made to the description of FIGS. 1 to 7 and to the reference symbols used therein.

[0049] FIG. 10 shows a compressor system 22 and a pump system, respectively. To drive the compressor 220 and the pump 230, respectively, these are mechanically connected to a drive shaft 101 of the electric machine 12 of the multiphase drive 10. To avoid repetition, reference is made to the description of FIGS. 1 to 7 and to the reference symbols used therein.

Claims

Patent claims 1. Energy supply device (1) for a multi-phase drive (10), wherein the energy supply device (1) is designed to generate a direct voltage for feeding the multi-phase drive (10) from an input voltage applied to a network connection point (2), in particular an alternating voltage of a power supply network, wherein the multi-phase drive (10) has an input direct voltage of less than 100 V and a rated power of more than 300 kW, in particular more than 1 MW, wherein the energy supply device (1) has a voltage converter (4), wherein the energy supply device (1) has a line section (3) for transmitting electrical energy by means of direct voltage to the multi-phase drive (10) with a rated voltage of less than 100 V.

2. Energy supply device (1), wherein the line section (3) has a length of less than 2 m.

3. Energy supply device (1) according to one of claims 1 or 2, wherein the voltage converter (4) is designed as a transformer (41) or as a DC-DC converter (42).

4. Energy supply device (1) according to one of claims 1 to 3, wherein the line section (3) is at least partially designed as a busbar.

5. Energy supply device (1) according to one of claims 1 to 4, wherein the energy supply device (1) has a further voltage converter (6).

6. Power supply device (1) according to one of claims 1 to 5, wherein the power supply device (1) comprises a rectifier (5).

7. Multiphase drive system (100) comprising a power supply device (1) according to one of claims 1 to 5 and a multiphase drive (10) with an input DC voltage of less than 100 V and a rated power of more than 300 kW, in particular more than 1 MW, wherein the energy supply device (1) is electrically connected to the multiphase drive (10), in particular to terminals of the multiphase drive (10).

8. Multiphase drive system (100), wherein the multiphase drive (10) has power converter modules (11), wherein the power converter modules (11) are each designed to feed the bars (120) of the stator of the multiphase drive (10).

9. Multiphase drive system (100) according to one of claims 7 or 8, wherein the energy supply device (1) has a rectifier (5), wherein the rectifier (5) and at least parts of the multiphase drive (10) are cooled using the same cooling principle, in particular by means of the same cooling circuit.

10. Multiphase drive system (100) according to one of the claims 7 to 9, wherein the voltage converter (4), the power converter modules (11) and / or the line section (3) are arranged inside a housing of the multi-phase drive (10).

11. A ship (20) having a multiphase propulsion system (100) according to any one of claims 7 to 10.

12. Wind turbine (21) with a multiphase drive system (100) according to one of claims 7 to 10.

13. Compressor system (22) comprising a compressor (220) and a multiphase drive system (100) according to one of claims 7 to 10, wherein the compressor (220) is mechanically coupled to a drive shaft (101) of the multiphase drive (10).

14. Pump system (23) comprising a pump (230) and a multiphase drive system (100) according to one of claims 7 to 10, wherein the pump (230) is mechanically coupled to a drive shaft (101) of the multiphase drive (10).

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