WO2014198419A1 - Energy supply system - Google Patents

Abstract

The invention relates to an energy supply system with which energy is supplied to one or more servo drives, in particular mobile operational or production means, in a purely optical manner without physical cable connections. For this purpose, the energy supply system consists of at least one transmitter system for transmitting at least one laser beam and at least one receiver system for detecting the laser beam transmitted by the transmitter system and for converting the energy of the laser beam into electric energy. The laser beam energy converted into electric energy is at least partly transmitted to at least one energy load provided in the receiver system, said energy load being designed as a servo drive.

Description

 Power system

The present invention relates to an energy supply system comprising at least one transmitter system and at least one receiver system.

Servo drives, so-called servo axes, are used particularly frequently in industrial applications. They are characterized by a controllable torque and a variable speed. Thus, the operating point in the speed-torque diagram can be set freely within limits. Servo drives are therefore particularly suitable as drives for industrial robots, for driverless transport systems or for handling grippers.

The operation of servomotors is only possible in combination with a servo controller. Servo motors exist in different power classes (1 W to 10 kW) and there are different designs. The torque is generated in all versions by a magnetic field that forms between the stator and rotor.

A typical servo motor often used in industrial environments is the permanent-magnet synchronous machine (PMSM). The stator consists of three-phase windings and the rotor of permanent magnets. By creating an alternating voltage on the stator, an alternating field is formed.

The decisive factor is the angle between the rotor and stator fields. Because only if the resulting stator field is perpendicular to the rotor field, in this configuration, the energy used, ie the applied current is converted into the maximum torque.

This vertical alignment is achieved by a measuring system for detecting the rotor magnetic field in combination with a controller. Encoders or Hall sensors are used as measuring systems. There are also sensorless methods for determining the rotor position, in which the voltage induced by the rotor in the stator is evaluated. The sensorless process has disadvantages at low speeds.

Based on the measurement signal provided by the respective measuring system, a defined rotating field is generated in the stator by vector control. Depending on the power class, the power for rotating field generation is taken either from a three-phase network (eg 400 V) or from a DC network (eg 24 V). In a 3-phase three-phase system, the electrical energy is first rectified and stored in a DC link (eg 600 V DC). By intelligently switching an inverter (pulse width modulation) to the DC intermediate circuit, the desired torque and the desired speed can be set on the servo drive. The control electronics has corresponding communication interfaces and signal inputs or outputs. The combination of controller and inverter with communication interfaces is called servo controller.

The combination of the motor with measuring system and controller results in the term servo drive or servo axis. Servo drives according to the state of the art and on the market offer several manufacturers (eg Bosch, Siemens, SEW, Beckhoff ...) a variety of servo drive systems.

Optionally, the servo drive can be equipped with a DC brake or with a mechanical holding brake. The control voltage for this is typically 0 to 24 V. In stopping operations, the generator principle can also be used (4-quadrant drive), which allows the feedback of braking energy into a "power storage".

For the servo drive system described above, there are already suitable power parts / servo controller, which consist only of an externally supplied with DC voltage intermediate circuit, a controlled inverter and an external control power supply.

In principle, exactly one servo controller or one servo axis also includes exactly one servo controller or axis controller. As a result, the space required and the application weight of the servo drive or the servo axis can be very large, usually those power electronic drive blocks (servo controller or axis controller) are housed in an external control cabinet. However, here too, the increased space requirement for complex drive structures quickly leads to space problems.

Accordingly, also novel servo-compact drives and decentralized servo drive systems are available on the market. With these servo-compact drives, the actuators required for speed and torque adjustment are located directly in / on the drive (eg servo drive "Wittenstein TLSA" with integrated servo-controller) .The power supply for these models can, for example, be provided by a DC voltage of 24 V. Thus, several servo axes to be connected to a voltage source coming out of the rectified 230 V mains is fed. In addition, these individual servo drives can be connected via a so-called hybrid cable for power transmission and for communication with the control electronics and each other.

Servo axes of moving operating or production means in the industrial production environment are supplied primarily by rigid cable connections or guided cable systems (cable drag systems) with electrical energy. However, cable-bound systems are subject to high wear and greatly restrict the freedom of movement of the moving system in range and twisting possibility. The entrainment of cables also requires increased space and the mass of the moving system can rise, which suffers the dynamics of such systems, ie the time to perform positioning movements of the system suffers.

In addition to permanently wired systems, there are systems that can be cyclically charged and therefore can operate wirelessly, at least during the charge-free time. However, an electrically loadable energy store (eg battery, capacitor, chemical energy storage) is required for this at the moving operating or production means, wherein the energy store is an expensive, voluminous and heavy additional component which has to be carried along by the system as additional ballast.

The charge of such an energy storage can be realized by a temporary cable connection or inductive power supply. The charging energy is transmitted wirelessly with inductive power supply. However, the inductive energy transfer is limited to short transmission paths, so that a special loading position and a certain residence time in this position are required, which ensures the low cost of such systems.

At present, therefore, all servo drives in operating or production means are used in the production sector (in particular in the nationwide strongly represented automotive production). The current trend in automobile production is leading to an ever-increasing variety of models and, at the same time, shorter model runtimes. As a result, the number of units produced per vehicle variant is significantly reduced, as a result of which the demands for flexible methods, devices and tools are becoming increasingly clear, especially in the body shop.

In addition to the previously rigidly executed body tensioning devices, for which there are now various concepts of flexibility, more and more flexible Energy supply systems needed. Flexibility solutions are currently only available in the form of cable drag systems. However, their range is very limited or even only one-dimensional feasible. The installation effort for such an energy and data supply by means of cable dragging system is also high. A certain susceptibility to failure of this conventional wired power supply system can not be excluded accordingly. In particular, the work in the range of high accelerations and decelerations, as they may occur regularly in servo-driven operating or production means, leads to faster wear of the cable tow. In addition, in cable drag systems, the mass of the system itself, ie the mass of electrical conductors and possibly surrounding surrounding sheath or guide components must be repeatedly moved, ie accelerated and decelerated, which entails unnecessary energy consumption and is particularly disadvantageous in highly dynamic servo drives ,

In view of the further increasing requirements for flexible, versatile and innovative production in the future, it is already foreseeable that conventional cable connections will no longer meet these requirements.

The invention is therefore an object of the invention to improve a power supply system of the type mentioned in such a way that the power supply and control of servo drives, especially servo drives in locally unbound and moving operating or production means for industrial production, on the one hand flexibly adaptable to production changes and on the other hand with high efficiency, high efficiency and low susceptibility to failure can be realized.

The object is achieved by a power supply system having the features of claim 1.

Such an optical power supply by means of a laser beam (preferably by the high-energy beam of a high power laser) allows the wireless transmission of energy to the servo drive axes of moving equipment or products in the field of industrial manufacturing, especially automobile and aircraft production.

Preferred embodiments of the energy supply system are the subject of the dependent claims. The transmission system preferably comprises a laser source with at least one radiation-generating laser, for example a semiconductor or solid-state laser, which converts the electrical energy supplied to it into the energy of the emitted laser beam. By having a photovoltaic receiver which transforms the energy of the laser beam impinging on it back into electrical energy, the receiver system enables wireless energy transmission between the transmitter and the receiver system. Thus, advantageously, physical cable connections between the transmitter and receiver systems can be dispensed with, whereby the degree of flexibility and versatility of industrial production equipment equipped with such a power supply system can be greatly increased.

Since a laser beam can be produced with high efficiency from modern laser sources, and since the conversion efficiencies of photovoltaic cells have been continuously increased in recent years, the laser-based power supply system proposed here not only offers advantages in terms of flexible applicability but is also economical. In addition, progress in the field of high-power lasers also allows cable and fiber-free transmission of high energies to be considered feasible in the near future.

To protect the laser beam (in particular to protect against harmful effects of the laser beam on humans), an additional laser protection system is preferably provided so that the energy supply system according to the invention can be safely integrated into an existing production environment or used for future factory planning.

In a preferred embodiment, a plurality of DC-DC converters are arranged in the receiver system, the laser beam energy converted into electrical energy being set to a plurality of different DC voltage levels with these DC-DC converters so that different voltage networks can be provided for the comprehensive supply of the downstream energy consumers in the receiver system.

In particular, two DC voltage levels can be formed in the receiver system, namely a control voltage (eg 24 V), which is distributed via a control voltage network to all system components of the receiver system which are used for control and / or communication and / or safety, and a power voltage (e.g. B. 600 V), which transmitted via a power voltage network to the or the servo drives of the receiver system becomes. Through these two DC voltage networks, the torque / speed control (controlled drive) of the present in the receiver system servo drive can be realized.

Preferably, the transmitter system is stationary and the receiver system movable, so carried out stationary. Thus, the integrated in the receiver system servo drive can realize any trajectories, as long as ensured by the geometric arrangement that transmitter system and receiver system have visual contact with each other. By providing buffering memories in the control voltage and / or power voltage network, however, a power supply of the servo drive or drives in the receiver system can be maintained even with short-term visual contact loss.

The invention will be explained in more detail with reference to embodiments and accompanying drawings. In these show:

1 a to 1 d, a power supply system in several embodiments in a schematic representation showing an energetic connection between transmitter and receiver systems, and

Fig. 2 is a block diagram of an energy supply system according to Fig. 1 in a schematic representation with preferred structure of transmitter and receiver system.

With a power supply system 1, a wireless power supply of servo drives 5 is made possible. According to an exemplary embodiment illustrated in FIG. 2, the energy supply system 1 has at least one energy-consuming transmitter system 2 and at least one energy-consuming receiver system 4, wherein at least one, in the present embodiment, three servo drives 5 are installed in the receiver system 4 as energy "consumer".

Such servo drives 5 are frequently used as servo axes in moving operating or production means for industrial production, for example in machine tools or in other automation solutions (packaging machines, industrial robots, grippers, driverless transport systems, mobile robot platforms and much more). The power supply of the servo axes in such above-mentioned moving operating or production means has hitherto mostly been provided by conventional energy guides (eg expensive cable drag systems and / or current-carrying slide rails), which, however, rapidly reach the limits of their capacity for the reasons already mentioned. To overcome these difficulties, it is provided that the energy transfer between the transmitter system 2 and the receiver system 4 is purely optically through the beam 3 of a high-energy laser, so that the speed and torque-controlled operation of the servo drives 5 wirelessly, ie without a physical connection between the transmitter system 2 and the receiver system 4 takes place.

The receiver system 4 with the servo drives 5 integrated there forms a stationary, freely movable unit, eg. B. the moving part of a moving operating or production means (gripper, mobile platform, etc.), which are dispensing with cable connections almost unlimited movement curves of the receiver system 4, as long as visual contact between the transmitter and receiver system 2, 4.

Depending on the field of use, groups of receiver systems 4a, 4b, 4c (eg several grippers or several other movable device parts) can also be supplied with electrical energy by a plurality of transmitter systems 2a, 2b. FIGS. 1a to 1d show how one or more transmitter systems 2, 2a, 2b can be energetically coupled to one or more receiver systems 4, 4a, 4b, 4c.

1 a represents the simplest expansion stage of the energy supply system 1. A single transmitter system 2 emits a single energy-supplying laser beam 3, which is received by a single receiver system 4.

In a further system expansion stage according to FIG. 1b, a single transmitter system 2 emits two laser beams 3, which are received by two receiver systems 4a, 4b which are independent of one another. These two receiver systems 4a, 4b can be mounted on the same moving part (eg the robot arm) of a moving operating or production means and perform the same movement. But they can also be spatially separated from each other on different moving parts of the device and therefore independently perform different movements.

According to FIG. 1c, two transmitter systems 2 a, 2 b each emit a laser beam 3, wherein both laser beams 3 are each directed to a single common receiver system 4. Thus, a higher power supply can be ensured for the receiver system 4. In addition, such an energy supply system 1 provides protection (redundancy) against the failure of a transmitter system 2a, 2b or against optical interference in one of the laser beam transmission links. In Fig. 1d, the complex system expansion stage of a power supply system 1 is finally shown, in which a group of two serving transmitter systems 2a, 2b is energetically connected to a group of three consuming receiver systems 4a, 4b, 4c. In this case, each of the two transmitter systems 2 a, 2 b emits three energy-supplying laser beams 3, these three laser beams 3 each being directed to a receiver system 4 a, 4 b, 4 c. This means, conversely, that each of the three receiver systems 4a, 4b, 4c respectively receives two energy-supplying laser beams 3, namely one laser beam 3 each from the two transmitter systems 2a, 2b. Such a system 1 is also distinguished by a high degree of redundancy against operational failures. In addition, the two transmitter systems 2a, 2b can be placed independently of one another so that there is always visual contact between the respective receiver system 4a, 4b, 4c and at least one of the two transmitter systems 2a, 2b. For this purpose, the two transmitter systems 2a, 2b can both be stationary, both movable or one stationary and one movable.

In each of the exemplary embodiments of an energy supply system 1 illustrated in FIGS. 1 a to 1 d, the energy transfer between the transmitter system (s) 2, 2 a, 2 b and the receiver system (s) 4, 4 a, 4 b, 4 c is purely optically using one or more laser beams 3 a high-energy laser instead. The handling of such high-energy lasers in the production environment requires special safety precautions in order to ensure personal safety, d. H. To ensure safety for the human body, especially eyes and skin, at all times. Special safety concepts have already been developed for the industrial use of such high-energy lasers, according to which the laser is integrated into the respective machine or system such that the laser range or operation of the machine / system are separated from one another so that the operator is not exposed to the laser radiation in any operating situation , For this purpose, inter alia, corresponding safety devices (such as, for example, protective cabin, light barriers, laser curtain, fences, etc.) are to be integrated into the respective system, which are connected to the respective control of the laser or the laser beam guidance in order to switch off the laser immediately in the event of a hazard.

In FIGS. 1a to 1d transmitter and receiver systems 2, 4 have been represented symbolically only by circles. A preferred structure of the transmitter and receiver system 2, 4 will be explained below with reference to FIG. 2.

The transmitter system 2 of the power supply system 1 contains primarily a laser source 18 for generating a laser beam 3. As the laser source 18, in this case, for example, se a semiconductor or solid state laser can be used. In order to secure the laser beam 3 emanating from the laser source 18, a laser protection system 20 is provided which protects the laser beam 3 against unauthorized intervention over the entire laser beam path from the transmitter to the receiver system 2, 4.

Both the laser source 18 and the laser protection system 20 are connected via corresponding data lines 25 to a higher-level control 19 of the transmitter system 2 in control connection. This controller 19 is provided with a control unit (eg industrial PC), which provides the operator with controls or visualization. Next 19 safety technology for safe control of the laser beam 3 is integrated into the controller.

The transmitter system 2 of the optical energy transmission system is preferably stationary, so fixedly mounted on the respective operating or production means, whereas the receiver system 4 is arranged on a mobile, mobile part of the respective operating or production means. The stationary attachment of the transmitter system 2, this can be supplied in a simple wired manner with electrical energy. The transmitter system 2 can be connected via electrical power supply lines 26 from the electrical network, z. B. a conventional 50 Hz / 400 V - three-phase supply.

Despite stationary mounting of the transmitter system 2, the laser beam 3 generated by the laser source 18 can be aligned with the receiver system 4 so as to always ensure a secure optical connection and consequently energy transmission between transmitter and receiver system 2, 4. For this purpose, the transmitter system 2 can be aligned manually and / or automatically on the receiver system 4.

In the illustrated embodiment, the transmitter system 2 is equipped with a tracking system 21 (tracking system) to allow automatic beam tracking with respect to the moving receiver system 4. Alternatively, the transmitter system 2 can be fixed to a moving system, e.g. As a traversable and rotatable recording device, be applied, this moving system performs a adapted to the mobile receiver system 4 movement, so that the laser beam 3 is in constant energy-supplying contact with the receiver system 4.

Moving industrial production equipment, such as robots, often have multiple freely movable axes for fast and accurate movement To perform movements. In order to supply these axes with energy over their entire course of motion without cables, a receiver system 4 is provided in the axes, as shown by way of example in FIG. 2. The receiver system 4 is therefore mobile and flexible location and without existing cables for power supply, this mobility of the receiver system 4 is also neither limited nor hindered.

The laser beam 3 emitted by the transmitter system 2 initially strikes a photovoltaic receiver 9 provided in the receiver system 4. This photovoltaic receiver 9 converts the incident laser radiation into usable electrical energy with a constant direct voltage.

The DC voltage provided by the photovoltaic receiver 9 depends on the interconnection and / or number of individual photocells installed in it and can be 3.6 V, for example. However, it would also be conceivable that the photovoltaic receiver 9 emits a constant DC voltage of 24V. Such a DC voltage could then advantageously be fed directly without adaptation by a voltage converter in a subsequent control voltage network 12.

Downstream of the photovoltaic receiver 9 are several energy consumers. A group of consumers is formed by electric servo drives 5, which are regularly used in moving operating or production means to ensure accurate and fast movements. Another group of consumers is formed by measurement technology and sensors 15, which is also regularly carried in the industrial environment on moving operating or production means to meet various measurement tasks. Finally, further electrical equipment components 17, such as. B. clamping technology (pin drawing cylinder, clamping cylinder ...) or other components, receiver side connected to the output of the photovoltaic receiver 9 as an energy consumer.

These pre-imaged and shown in Fig. 2 energy consumers within the receiver system 4 are fundamentally different in their power supply. In order to be able to provide the respective required electrical voltage to the energy consumers, two DC / DC converters 10, 11 are contained in the receiver system 4, which convert the DC voltage output by the photovoltaic receiver 9 into two DC voltage levels. From the first DC-DC converter 10, the DC voltage of the photovoltaic receiver 9 is transformed to a low DC voltage level (24 V), while the second DC-DC converter 11 transforms the DC voltage of the photovoltaic receiver 9 to a high DC voltage level (600 V).

The low DC voltage level is fed as a control voltage into a control voltage network 12, which is recognizable in FIG. 2 by dotted lines, while the high DC voltage level is fed as a power voltage into a power or high-voltage network 13, which is shown in FIG. 2 by dashed lines ,

Finally, the receiver system 4 also contains a data line network 24 (shown in FIG. 2 as thin solid lines). Bidirectional communication between the components (photovoltaic receiver 9, servo controller 5a, 6 of the servo drives 5, buffering memory 14, 15, communication interface 23) of the receiver system 4 can take place via this data line network 24.

With the two voltage networks 12, 13, the supply of all consumers is ensured. By way of example, the control voltage network 12 (24 V) supplies all the system components of the receiver system 4 which are used for control, communication and safety. In particular, the 24 V control voltage is applied to the corresponding control voltage terminals of the servo controllers 5a, 6 of the servo drives 5. Each of the three servo drives 5 of the receiver system 4 shown in Fig. 2 necessarily has a servo controller 5a, 6 which regulates the current for the motor phases, so that the servomotor is supplied exactly with the current that it needs for the desired torque and the desired speed needed.

Two of the three servo drives 5 shown are designed as servo-compact drives and have an integrated servo-controller 5a. The third (in Fig. 2 mean) servo drive 5 uses a separate servo controller 6, which is connected by power and encoder cables 7, 8 to the drive 5. In any case, the three servo controllers 5a, 6 are supplied by the photovoltaic receiver 9 and DC converter 10 with the required control voltage in order to control the torque and the rotational speed of the servo drive 5 can.

The supply of the servo controller 5a, 6 with this control voltage is ensured by a connected to the control voltage network 12 memory 14, which by a charge and condition monitoring relevant system functions in visual contact loss, in Stand-by operation, emergency shutdown or other malfunctions always maintains or avoids falling below the minimum state of charge.

In addition to the servo controllers 5a, 6 of the three servo drives 5, measuring technology / sensors 16 are additionally connected to the control voltage network 12, which are carried in the mobile receiver system 4 in order to provide reliable parameters for production monitoring and control, for example in the context of industrial production. Further, other electrical equipment components 17 may be connected via corresponding terminals on the control voltage network 12, for example, the control electronics of other electrical machines.

Finally, a communication interface 23 of the receiver system 4 is operated with a control voltage (24 V) by the control voltage network 12 (shown in dotted lines in FIG. 2). This communication interface 23 of the receiver system 4 is in wireless communication with a corresponding communication interface 22 of the transmitter system 2 in order to enable a wireless signal exchange between the transmitter and receiver system 2, 4. Advantageously, current position information of the mobile receiver system 4 can thus be transmitted. Since the communication interface 22 of the transmitter system 2 is in turn connected to the higher-level controller 19 of the transmitter system 2, the transmitted position information for controlling the target tracking system 21 and the laser source 18 of the transmitter system 2 can be used to produce a precisely aligned and tracked laser beam 3.

The wireless communication interfaces 22, 23 can be designed as WLAN, Bluetooth or other radio interfaces. For a faster data transfer, a version as infrared interfaces would also be possible. The communication via infrared could be done by the already optimally aligned between the laser source 18 and photovoltaic receiver 9 laser beam 3, so that the laser beam 3 would take on a dual function (power supply and signal exchange).

In the case of multiple transmitter and / or receiver systems 2a, 2b, 4a, 4b, 4c (see Fig. 1 b, 1c, 1 d), the communication system via a network bus, z. B. Ethernet, which connects all controls of the individual transmitter or receiver systems 2a, 2b, 4a, 4b, 4c with each other.

In the dashed line in Fig. 2 highlighted power voltage network 13 is connected via a DC voltage converter 11 connected to the photovoltaic receiver 9, a high voltage fed. The high voltage generated by the DC-DC converter 1 1 corresponds to the intermediate circuit voltage of the applied servo drive units 5. This DC link voltage is respectively supplied to the inverter 27 of the three provided in FIG. 2 as energy consumers servo drives 5 and may be, for example, 600 volts. Since the servo controllers 5a, 6 each include the inverter 27, the servo controllers 5a, 6 of the three servo drives 5 are also connected to the power voltage network 13 in FIG.

In accordance with the control voltage network 12, a buffering memory 15 (eg battery, capacitor, etc.) is likewise integrated within the power voltage network 13 in order to supply the servo drives 5 with the required power voltage even in the event of a failure of the energy-supplying laser beam 3 (FIG. eg in the event of visual contact loss, standby mode, emergency shutdown ...). The dimensioning of the memory 15 used can be optimally adapted to the prevailing conditions, in particular to the number and duration of the servodrive units 5 used.

Also on the receiver-side power voltage network 13 in addition to the servo drives 5 via corresponding terminals further electrical equipment components 17 (eg., Positioning and / or clamping elements such as Stiftziehzylinder, clamping cylinder, etc.) are connected. Thus, the memory-integrated control and power voltage network 12, 13 provided on the receiver side permits a reliable supply of electrical energy to the consumers connected in the receiver system 4.

In addition, the individual components (photovoltaic receiver 9, buffering memory 14, 15, servo controller 5a, 6 of the servo drives 5, communication interface 23) of the receiver system 4 via a (shown in FIG. 2 with thin solid lines) network (data line network 24) with each other connected so that, for example, in a detected failure in the photovoltaic receiver 9 (eg, because of visual contact loss, emergency shutdown ...) an uninterrupted further supply to the connected loads (servo drives 5, measurement / sensor 16 ...) through the memory 14, 15 can be guaranteed.

The energy supply system 1 presented here can be integrated, in particular, into moving operating or production means for industrial production (such as, for example, robot-controlled grippers, robot-guided screwdrivers, etc.). However, it can also be used to power mobile platforms, in particular for monitoring, navigation and / or backup tasks. The servo drives of such devices have heretofore been supplied with electrical energy primarily by physical cable connections, which severely restricts the degree of flexibility and versatility of these known devices. In the power supply system 1 according to the invention, however, a purely optical energy transmission takes place between the transmitter and receiver system 2, 4 by means of a laser beam 3, whereby the speed / torque control of stationary, freely movable servo drives 5 can be realized without restricting cable and plug connections. In this way, a flexible, versatile and economical power supply of the servo drives 5 is provided.

Claims

Patent claims 1 . Energy supply system (1) with: - at least one transmitter system (2) for emitting at least one laser beam (3) and - at least one receiver system (4) for detecting the laser beam (3) emitted by the transmitter system (2) and for converting the energy of the laser beam (3) into electrical energy, which is at least partially transmitted to at least one energy consumer present in the receiver system (4), wherein this energy consumer is designed as a servo drive (5), characterized in that the transmitter system (2) is stationary and the receiver system (4) is movable, the transmitter system (2) being equipped with a target tracking system (21) for automatic tracking of the laser beam (3) in relation to the moving receiver system (4). 2. Energy supply system according to claim 1, characterized in that a transmitter system (2, 2a, 2b) simultaneously emits an energy-supplying laser beam (3) to several receiver systems (4a, 4b, 4c) and / or that a receiver system (4, 4a, 4b, 4c) simultaneously receives an energy-supplying laser beam (3) from several transmitter systems (2a, 2b). 3. Energy supply system according to claim 1 or 2, characterized in that the servo drive (5) has an integrated servo controller (5a) and the laser beam energy converted into electrical energy is at least partially supplied to this servocon-troller (5a). 4. Energy supply system according to at least one of the preceding claims 1 to 3, characterized in that the servo drive (5) a separate servo controller (6) is connected upstream of which the charge converted into electrical energy Serial beam energy is at least partially supplied and via power cables (7) and encoder cable (8) is connected to the servo drive (5). Energy supply system according to at least one of the preceding claims 1 to 4, characterized in that the receiver system (4) is a photovoltaic receiver (9), which converts the incident laser beam (3) into electrical energy with a constant direct voltage. Energy supply system according to at least one of the preceding claims 1 to 5, characterized in that a plurality of DC-DC converters (10, 11) are arranged in the receiver system (4), with these DC-DC converters (10, 11) converting the laser beam energy into electrical energy into several different ones DC voltage levels are set. Energy supply system according to at least one of the preceding claims 1 to 6, characterized in that two DC voltage levels are formed in the receiver system (4), a control voltage which is applied via a control voltage network (12) to all system components of the system which are used for control and/or communication and/or security Receiver system (4) is distributed, and a power voltage that is transmitted via a power voltage network (13) at least to the servo drive or drives (5) of the receiver system (4). Energy supply system according to claim 7, characterized in that the control voltage network (12) and/or the power voltage network (13) are each connected to at least one buffering memory (14, 15). Energy supply system according to claim 7 or 8, characterized in that additional consumers, such as measurement technology / sensors (16) and / or further electrical equipment components (17), are connected to the control voltage network (12) and / or to the power voltage network (13). 10. Energy supply system according to at least one of the preceding claims 1 to 9, characterized in that the servo drive (5) is designed as a permanently excited synchronous machine. 11. Energy supply system according to at least one of the preceding claims 1 to 10, characterized in that the transmitter system (2) comprises a laser source (18) with at least one radiation-generating laser diode, the laser source (18) being connected to a higher-level controller (19) of the transmitter system ( 2) has a tax connection. 12. Energy supply system according to at least one of the preceding claims 1 to 11, characterized in that a laser protection system (20) is provided to protect the laser beam (3), the laser protection system (20) being connected to a higher-level controller (19) of the transmitter system (2). has a tax connection. 13. Energy supply system according to at least one of the preceding claims 1 to 12, characterized in that a wireless signal exchange between the transmitter and receiver systems (2, 4) takes place via communication interfaces (22, 23) provided on the transmitter and receiver systems (2, 4). . 14. Energy supply system according to claim 13, characterized in that the communication interfaces (22, 23) are WLAN or infrared interfaces. 15. Energy supply system according to at least one of the preceding claims 1 to 14, characterized in that the laser beam (3) additionally carries out a signal exchange between the transmitter and receiver systems (2, 4). 16. Energy supply system according to claims 5, 7 and 1 1, characterized in that the laser source (18) is fed by a three-phase 400 V alternating voltage with a frequency of 50 Hz, and that the direct voltage output by the photovoltaic receiver (9) is 3, 6 or 24 V, which is present in the control voltage network (12). Control voltage is 24 V and the power voltage present in the power voltage network (13) is 600 V. 17. Moving operating or production equipment for industrial production, characterized in that it comprises an energy supply system (1) according to at least one of the preceding claims 1 to 16. Mobile platform, in particular for monitoring, communication, navigation and / or security tasks, characterized in that it comprises an energy supply system (1) according to at least one of the preceding claims 1 to 16.