WO2022069413A1

WO2022069413A1 - Machine with energy supply of a rotating element

Info

Publication number: WO2022069413A1
Application number: PCT/EP2021/076521
Authority: WO
Inventors: Peter Spies; Tobias Dräger; Johannes KNAUER; Henrik Zessin; Sandro Thalmann; Oliver Haala; Hendrik Rentzsch
Original assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Priority date: 2020-09-30
Filing date: 2021-09-27
Publication date: 2022-04-07
Also published as: JP2023547780A; DE102020212399A1; EP4221925A1

Abstract

Element, in particular rotating element, having the following features: an inductor that moves or rotates conjointly with the rotating element and that is designed to provide electrical energy when moving in an a magnetic field; and a load that moves or rotates conjointly with the rotating element and that can be operated by the electrical energy provided.

Description

MACHINE WITH ENERGY SUPPLY OF A ROTATING ELEMENT

description

Embodiments of the present invention relate to an element such as a rotating element, in particular a (rotating) element with some kind of energy supply means. Further exemplary embodiments relate to a drill chuck or drill holder. Further exemplary embodiments relate to a machine, in particular a drilling or milling machine with a rotating element.

A drill chuck is a classic rotating element that primarily has only mechanical tasks. A typical task is to pick up a tool, such as a drill, and drive it with the rotational energy of the drill. In the prior art, three different drill chuck types or drill connections are used. According to a variant, a drill chute may have engagement means on both the rotary input and rotary driven sides. The drill chuck is then coupled to a rotating shaft of the drill on the drive side, while a drill can be clamped in on the output side, for example by means of a quick-release connection. Alternatively, it would also be conceivable that the tool or the drill is permanently connected to the drill chuck and the entire drill chuck together with the tool is always changed. According to a third variant, it would also be conceivable for the drill chuck to be firmly connected to the drill and for the drill chuck, for example designed as a keyless drill chuck, to be able to accommodate different tools. In all variants, the drill chuck is designed as a kind of coupling between a rotating shaft and a rotating tool. With regard to automation and monitoring, sensors are provided, some of which are also incorporated into the rotating components. These electronics can be powered by a battery, for example.

The object of the present invention is to be seen in equipping a rotating element, such as a drill chuck, with electronics.

The object is solved by the subject matter of the independent patent claims. Exemplary embodiments of the present invention create an element, in particular a rotating element or rotatable element, with an inductance moving/rotating together with the (rotating) element and a rotating load moving together with the (rotating) element. The inductance is designed to provide electrical energy during movement, for example during a rotational movement in a magnetic field. The consumer is operated by the electrical energy provided.

According to exemplary embodiments, the load can have electronics, for example. According to exemplary embodiments, this can in turn comprise an actuator system (for example an ultrasonic actuator or control element) and/or a sensor system which is designed to output (sensor) information. For example, information relating to a force, vibration, acoustics, mechanical stress, temperature, torque, rotational speed and/or acceleration can be considered as sensor information.

According to exemplary embodiments, the movement is a rotational movement caused by the rotation of the rotating element, although it should be noted at this point that other types of movement, such as a cyclical movement or a jerky movement, decoupled from the rotation of the rotatable elements are used.

Exemplary embodiments of the present invention are based on the finding that in the case of an element, in particular a rotating or rotatable element for supplying power to a consumer in the element with the aid of a coil or generally an inductance, electrical energy can be harvested if the (rotating or rotatable) element moves in a magnetic field. It would be conceivable here, for example, for the magnetic field to be applied externally, which means that the magnetic field is generated or provided in the vicinity of the (rotating) element, so that as a result of the movement of the rotating element, e.g. B. a rotation in the magnetic field, a current is induced. According to exemplary embodiments, it would be conceivable for magnets to provide the magnetic field to be arranged on the housing of the drill in the area of the drill chuck. In the case of exemplary embodiments, it is advantageous that a consumer which rotates together with the rotating element can be supplied with current directly via the rotating inductance. This means that there is no cabling required, for example by grinders, to provide electrical energy or a to transmit electrical signal from the non-rotating to the rotating element. Furthermore, interface problems are avoided if the rotating element is to be replaced.

In accordance with exemplary embodiments, the rotating element has an energy supply circuit which is coupled to the inductance in order to provide electrical energy via this. In this case, the energy supply circuit can have, for example, a rectifier and/or a buffer memory and/or a capacitor and/or a rechargeable battery. The energy supply circuit advantageously makes it possible to provide the consumer or the electronics with a continuous energy signal relatively independently of the movement speed (number of revolutions). In the event of a standstill, a continuous energy supply to the load can also be ensured by an energy supply circuit with a buffer memory.

As already explained above, according to exemplary embodiments, the consumer can be designed as a type of sensor system or as an actuator system. It would be conceivable here for a tachometer, an accelerometer, a dynamometer or a vibration meter to be integrated. In accordance with exemplary embodiments, the inductance functions as a sensor system. The induced signal, e.g. induced current, is used as a measurement signal because it allows conclusions to be drawn about a physical variable, such as speed or vibration. An actor, e.g. B. an ultrasonic actuator may be provided to improve chip formation during a drilling operation.

According to further exemplary embodiments, the sensor system can transmit the information obtained externally by radio. In the same way, the actuators can also be controlled using a radio module. As an alternative to communicating the information externally, it would also be possible to display the information directly, e.g. B. by a display integrated into the rotating element. This can be formed, for example, by color-coded LEDs (color-coded status information). A kind of acoustic display by a warning tone, e.g. B. overload, conceivable.

Now that the functionality of the consumer has been explained in detail, the implementation of the energy harvesting function, i.e. the inductances, will now be discussed. According to exemplary embodiments, the inductance can be formed by one or more coils. In this case, each coil can optionally be designed with a ferrite core or another core. According to exemplary embodiments, a plurality of coils are present as the inductance, which are distributed translationally around an axis of rotation of the rotating element or even distributed equally. The coils must then be electrically connected to one another in a suitable manner via an electronic circuit in order to add up the individual energy yields and make them available to a consumer in aggregate. The translatory arrangement of several coils is advantageous since a higher energy yield is achieved in this way. According to exemplary embodiments, the electrical energy provided depends on the number of inductances. According to a further exemplary embodiment, the energy provided can also depend on the dimensioning of the inductances and on the dimensioning of the element generating the magnetic field. In a longitudinal view, that is to say along the longitudinal axis, the inductances can be arranged in a first half, while the consumer is arranged in the second half, for example. The first half is, for example, the side with which the rotating element is connected to an output, e.g. B. the drill is connected. In this respect, according to exemplary embodiments, the rotating element has a type of coupling for the mechanical connection to a rotary machine in the first half. According to exemplary embodiments, the rotating element can have a tool holder for a tool or a drill in the second half.

A preferred embodiment relates to a drill chuck or a drill holder with a rotating element. A further exemplary embodiment relates to a rotary machine, in particular a drill, with a rotating element and a rotating output. Here, the rotating element is coupled to the rotating output. For example, according to exemplary embodiments, the coupling between the rotating element and the rotating output can be formed by a type of quick-release fastener. This makes particular sense when the rotating element is exchanged when the tool is changed. Devices of this type are often provided in highly automated drilling or milling machines, in which different drilling heads can be used by means of a tool turret.

With regard to the magnetic field-generating element, it should be noted that, according to exemplary embodiments, the rotating machine has one or more magnets in the area of the output and/or in the area of the inductivities of the rotating element. This advantageously allows the magnets to remain at rest when the rotating element rotates. To this extent, in this exemplary embodiment, the movement of the rotating element, which brings about an induction of electrical energy, would be a rotational movement. According to exemplary embodiments, the rotating elements are arranged in a rotational manner about the axis of rotation. A crescent-shaped arrangement would also be conceivable. Such an arrangement advantageously allows good access to this area to still be provided. The arrangement on the drill is advantageous overall, since a retrofit, e.g. B. by a subsequently attached holder is possible. According to exemplary embodiments, the magnets are of alternating polarity, e.g. B. in the form of a Halbach array. This arrangement enables a strongly changing magnetic field, so that a high level of electrical energy can be harvested overall.

Even if it was assumed in the above exemplary embodiments that the element is a rotating element or a rotatable element, it should be noted at this point that any types of other elements are also used. Therefore, a further exemplary embodiment creates an element with an inductance which can be moved or rotated together with the element and which is designed to provide electrical energy when moving in a magnetic field, and a consumer which moves or rotates together with the element and which is provided by the electrical energy can be operated.

Further formations are defined in the dependent claims. Exemplary embodiments of the present invention are explained using the enclosed drawings. Show it:

1 shows a schematic block diagram of a rotating element according to a basic exemplary embodiment;

FIGS. 2a and 2b show a schematic representation of a rotating element according to an extended exemplary embodiment; and

3a and 3b are schematic diagrams to illustrate possible arrangements of coils and magnets and the resulting harvested power. Before exemplary embodiments of the present invention are explained below with reference to the accompanying drawings, it should be noted that elements and structures that have the same effect are provided with the same reference symbols, so that the description of them can be applied to one another or are interchangeable.

1 shows a rotating element 10, here in the form of a drill chuck or a drill holder, which is driven by an optional output, here an output shaft 12. The rotating element has, for example, one or more inductances 14a or 14b in an upper half. In addition to the inductances 14a and 14b, the rotating element has a consumer 16 . At this point it should be pointed out that the rotating element does not necessarily have to rotate, but should generally be rotatable.

According to exemplary embodiments, the rotating element can, for example, also extend around the axis of rotation (cf. reference number 10r).

External magnets 18, ie magnets not belonging to the rotating element, which provide a magnetic field M, are also arranged around the axis of rotation. At this point it should be pointed out that it is not important how the magnetic field M is provided by the magnets 18, but that this magnetic field M is present, preferably in an area in which the coils 14a and 14b can move.

For the sake of completeness, it should be pointed out that the rotating element 10 can be a drill chuck, for example, as illustrated by the drill 11 . This rotates on the axis of rotation 10r in direction R. The rotation in direction R represents a movement, it being pointed out at this point that the movement does not necessarily have to be rotary. The movement R of the coils 14a and 14b, which can be arranged translationally about the axis of rotation 10r, causes the coils 14a and 14b to move in the magnetic field M. This results in an induced current that is made available to the load 16. This induced current represents a harvested energy E.

Energy is thus advantageously generated, starting from the rotational movement, so that the electronics embedded in the rotating element 10 can act in an energy self-sufficient manner. The electronics can be, for example, sensors and/or actuators and/or also means of communication, such as a radio communication means, act, which are then supplied with energy. The load 16 can thus be supplied with energy wirelessly, so that there is no need for sliding contacts for the voltage supply.

Even though the rotating element 10 was explained as a type of drilling or milling tool in the above exemplary embodiments, it should be pointed out that other applications, such as in the form of turbines or wind turbines, would also be possible. If one assumes, for example, that the rotating element 10 represents the hub of a turbine or a wind wheel, electronics, e.g. B. a speed sensor or even an actuator, be provided for adjusting the turbine wheels. An application in conveyor belts, e.g. B. in roller conveyors, conceivable. In this case, the rotating element is then embedded in a bearing element of the roller conveyor, so that monitoring of the conveyor belt or also a drive of the conveyor belt is conceivable here. Other applications are integration into a bearing, drive wheels, or wheels in general. What is important in this exemplary embodiment is that an external magnetic field can be provided. This is possible with the turbines, wind turbines, conveyor belts or bearings just mentioned, since the magnets can be attached to the corresponding bearing block, for example. In the case of drives or a wheel, for example, it would also be conceivable for the magnets to be provided in the area of any braking devices or suspensions.

Another application example relates to a clutch, such as a slip clutch or the like, which is to be sensed or controlled internally. The task of a clutch is to connect two rotating elements to one another or to transmit general rotational energy, which is also the case here in the exemplary embodiment from FIG. Here, a rotary element is transferred from the output 12 to the drill 11 . The rotating element 10 represents the clutch.

An extended exemplary embodiment of a drill chuck is explained below with reference to FIGS. 2a and 2b.

FIG. 2a shows the rotating element 10' in an unlatched state, with the rotating element 10' in FIG. 2b correspondingly being latched. The latching refers to the output side, which is provided with the reference symbols 12', 12g' and 18. The output is essentially composed of two elements, namely a static part belonging to a spindle 12g' and a spindle 12', which represents the rotating part of the machine tool. The output or the output shaft 12' is mounted in a type of bearing/bearing block/housing 12g' or generally in the static part 12g'. The magnets are connected to the static part 12g'. These are arranged, for example, in a rotationally symmetrical manner or only in a semicircle around the axis of rotation 10r.

The rotating element 10' has a cylindrical shape, with a type of engagement section 10k1' being formed in the first half of the cylinder, via which the rotating element 10' is connected to the rotating spindle 12' of the machine tool (cf. Fig. 2 B). In the second half there may be another engaging portion 10k2' to couple the tool 11. In this exemplary embodiment, this second engagement section 10k2' is implemented by a screw or grub screw, which exerts a force perpendicular to the axis of rotation 10r' on the tool 11 inserted into the drill chuck 10' and thereby fixes it.

In electronic terms, the rotating element 10' comprises at least one or more inductances 14 for energy harvesting. These are arranged in the first half (cf. clutch 10k1 ') in such a way that they are axially at the same height or in the area of the magnets 18 (cf. Fig. 2b) when the rotating element 10 'is coupled to the spindle 12'. In addition, the rotating element 10' also has an energy consumer. Here the energy consumer comprises three elements, with other configurations corresponding to further exemplary embodiments also being able to be used. The three elements are antenna and radio module 16f', control electronics and data processing 16p' (general processor) and sensors 16s'. In this exemplary embodiment, the sensor system is arranged in the area of the clutch 10k2' and is used to monitor the tool 11. For example, a transmitted torque, a vibration, a temperature, etc. could be monitored. The data obtained with the sensor 16s' are then processed with the processor 16p' and transmitted externally by radio with the radio module 16f', which also has an integrated antenna. All three elements 16f', 16p' and 16s' are supplied with power via the inductors 14. It should be noted at this point that the inductors 14 can also be connected to a power supply element (part of the electronics) which processes the electrical energy, e.g. B. by rectification, intermediate storage or buffering, and summing up the individual yields of the inductances. of buffering comes 'to an important role when no movement r of the inductors 14 in the provided by the magnets 18 magnetic field M takes place. Thus, the components 16t′, 16p′ and 16s′ can also be supplied with energy shortly after the energy harvest.

With regard to the movement R, it should be noted that it is also assumed in this exemplary embodiment that the inductances 14 move in a rotary manner in the magnetic field M of the magnets 18 . Such movement and energy harvesting is typical for generators, in which case, in contrast to generators, the energy from the coils 14 is not transferred externally, but is consumed internally in the rotor element 10'. According to exemplary embodiments, it is not absolutely necessary for a rotational movement 10r to take place. If, for example, a percussion drill is used as a basis, the rotational movement can also have a stroke component along the axis of rotation 10r. In this respect, a cyclical movement can generally be assumed. In extreme cases, the rotation component can even be completely omitted, as is the case with a chisel or a riveting tool, for example. All variants of notorious movement 10r, rotary movement with a stroke component or only a stroke component, have in common that the inductances 14 move in the magnetic field M that is provided by the magnets 18. According to exemplary embodiments, a cyclic movement can be assumed, with the movement not necessarily having to be regular. The energy harvesting is indicated here by the arrow in FIG. 2b.

As was shown with the aid of FIGS. 2a and 2b, the combination of the elements 14 and 18 thus makes it possible to convert the energy of a rotational movement into electrical energy. Here, the elements 14 and 18 together form an electrodynamic generator. This makes it possible, for example, to supply a wireless sensor with energy so that it can be used autonomously and wirelessly in a rotating element, such as a chuck. Different radio standards (e.g. UWIN, Bluetooth, BLE, analog radio or other variants) are used for radio transmission from the rotating, metallic system.

Even if it was assumed in the above exemplary embodiments that the element 16s′ functions as a sensor system, it should be noted at this point that an actuator system, such as a piezo actuator system, is also used. In the case of actuators, the energy requirement is higher, and it will be explained below how the higher energy requirement is caused by the Combination of elements 14 and 18 can be covered. The higher energy requirement depends on the one hand on other applications, but on the other hand also on different sizes of the rotating element 10'.

As has already been explained in connection with FIG. 1, according to a preferred variant, the arrangement of the inductances 14 or 14a and b is designed in such a way that they extend translationally around the axis of rotation. If, for example, two or three coils 14 are assumed, then the respective coil core extends perpendicularly to the axis of rotation 10r according to an exemplary embodiment. With two coils, the axes of the coils are then preferably arranged at a 180° angle, while with three coils a 120° arrangement would then be possible. The different energy requirements can be adjusted via the number of coils. Thus, with a small rotating element 10' with the same magnets 18, less energy can be harvested than with a large rotating element in which more coils are integrated. According to further exemplary embodiments, dimensioning of the coil would also be variable as an alternative or in addition. A further possible variation for varying the effective electrical power consists in the arrangement and dimensioning of the magnets 18. FIG. 3b shows the effective power in a coil for different speeds at different magnet heights with a total of six diagrams. Another variation factor (see X-axis) is the number of curve angles used. This assumes that the magnets are attached across different curve angles. As can be seen, the power output increases with the use of additional turning angles. The electrical power also increases with higher speeds. Likewise, the electrical power increases with the height of the magnet. If one assumes, for example, that 18 watts are generated per coil (cf. 16 mm magnet at 9000 revolutions and used curve angles of 240°), then when using 18 coils a power of up to 200 watts can be harvested will.

At this point it should be noted that not only the used solid angle is decisive, but also the number of magnets. It was assumed here that twelve magnets are used at a solid angle of 240°. Of course, another number is also conceivable. Furthermore, a solid angle of >240°, e.g. B. 360®, conceivable. All of these factors contribute to being able to scale the electrically transmitted power accordingly. At this point it should also be pointed out that the magnets cannot be arranged arbitrarily close to one another, as becomes clear with reference to FIG. 3a.

FIG. 3a shows an axial view of magnets 18a, 18b and 18c interacting with coil 14. FIG. The magnets 18a, 18b and 18c each form magnetic lines M, which are shown here correspondingly over the surface. The coil, which is arranged tangentially in the iron tool holder, moves in the magnetic field M. The coil can have a ferrite core, for example. The magnetic flux density is shown across the gray scales, with the white lines representing the magnetic vector potential in the Z direction (in Wb/m).

3b shows the magnitude of the flux density. In the embodiment of FIG. 3b, it is assumed that the magnets are oriented alternately, which maximizes the magnetic flux change. Other arrangements/alignments would also be conceivable, for example in the form of a Halbach array, which would maximize the magnetic flux in the area of the inductances, or an arrangement with the same orientation.

In the case of the above exemplary embodiment, it was assumed in particular that a rotational movement is present. As has already been explained, other movements, for example cyclic movements or uncorrelated movements, are also conceivable. According to a further exemplary embodiment, the rotating element does not have to be a rotating element at all, but rather a simple element which, for example, only performs a lifting movement, e.g. B. along the axis 10r of FIG. 1 . With such a cyclic lifting movement, the coils 14a and 14b are also moved in the magnetic field provided by the magnets 18, so that current is induced in the moving element.

At this point it should be pointed out that it is not mandatory to use magnets, but also other elements that generate a magnetic field, such as electromagnets, for example, which advantageously makes it possible to control the magnet strength.

According to embodiments, the magnets in a circle segment, such as. B. a semicircle segment, or a smaller circle segment or a larger circle segment. Arrangements would be conceivable, for example, in the range from 20 or 30 to 330 or 340 degrees or preferably in the range between 60 and 270 degrees, but also in the range between 90 and 180 degrees. Any value in the specified areas would be conceivable. The arrangement corresponding to a circular arc segment is advantageous because the achievable energy yield can be increased in this way, with a circular segment remaining open at the same time, so that accessibility is retained.

At this point it should be noted that the magnets can be arranged both radially around the rotating element and axially. In the case of a radial arrangement, this then leads, for example, along a circular arc segment along the radius, e.g. B. arranged parallel or perpendicular to the axis of rotation. In the case of an axial arrangement, the rotating element can protrude, in which case the magnets then protrude, for example from the housing side, onto the protruding flank.

In the above exemplary embodiments, it was explained that a power supply circuit, e.g. B. can be provided with a capacitor or a battery. The accumulator can also be dimensioned sufficiently large so that charging takes place through brief movement, and the power dimension of the accumulator is high in relation to the potential consumption. This is particularly possible for consumers with low power consumption, such as sensors.

A preferred exemplary embodiment describes the generation of electrical energy from rotation without a stator, in particular the generation of electrical energy on a rotating object to supply radio sensors. An inductance is used for this, which is moved relative to a fixed magnet. The inductance consists of one or more turns of wire and is connected to a rectifier and an energy supply unit. The magnet is located on the rotating object, but is mounted in such a way that it can move relative to the inductance. The energy supply unit can supply a sensor, actuator or radio module. The sensor captures information on the rotating object and wirelessly transmits that information. The radio module can also receive data in order to control the actuator. For example, the system can be used on drill chucks, couplings or axles.

At this point it should be noted that the above exemplary embodiments are only illustrative and the scope of protection is defined by the following patent claims. Reference sign

Downforce (12, 12')

Rotor element (10, 10') Magnet (18)

Inductance (14, 14a, 14b)

tool (11)

First half (10k1')

Second Half (10k2') Movement (R)

Rotation thing (10r)

consumers (16)

magnetic field (M)

Energy (E) radio module (16f')

sensors (16s')

Claims

patent claims

1. Machine, in particular a drill, with a rotating output (12, 12') and an element (10, 10'), in particular a rotating element (10, 10'), the element (10, 10') with the rotating output (12, 12') is coupled, the element (10, 10') has the following features: an inductance (14, 14a, 14b) moving or rotating together with the element (10, 10'), which is formed , upon movement (R) in a magnetic field (M) to provide electrical energy (E); and a consumer (16) which moves or rotates together with the element (10, 10') and which can be operated by the electrical energy (E) provided; wherein a plurality of magnets (18) are arranged in the shape of segments of a circle around the axis of rotation (1 Or) of the element (10, 10').

2. Machine according to claim 1, wherein the consumer (16) comprises electronics.

3. Machine according to claim 1 or 2, wherein the inductance (14, 14a, 14b) is coupled to an energy supply circuit, via which the electrical energy (E) is provided; or wherein the inductor (14, 14a, 14b) is coupled to a power supply circuit via which the electrical power (E) is provided, wherein the power supply circuit has a rectifier and/or a buffer store and/or a capacitor and/or has a battery.

4. Machine according to one of the preceding claims, wherein the consumer (16) has an actuator, an ultrasonic actuator and / or an actuator.

5. Machine according to one of the preceding claims, wherein the electrical consumer (16) has a sensor system which is designed to output information; or wherein the electrical consumer (16) has a sensor system (16s') which is designed to output information, the sensor system (16s') being designed to be a force, a vibration, an acoustic, a mechanical stress, a temperament - to detect a torque, a speed and/or an acceleration; and/or wpbei the inductor (14, 14a, 14b) is designed to function as a sensor system (16s') and/or based on an induced signal in the inductor (14, 14a, 14b), an inductor (14 , 14a, 14b) that allows conclusions to be drawn about a physical variable, in particular a speed or vibrations.

6. Machine according to one of the preceding claims, which also has a radio module (16f') which is designed to externally transmit information obtained in the element (10, 10').

7. Machine according to one of the preceding claims, wherein the inductance (14, 14a, 14b) is formed by one or more coils or wherein the inductance (14, 14a, 14b) by one or more coils with a ferrite core; or wherein the inductance (14, 14a, 14b) is formed by a plurality of coils which are distributed translationally about an axis of rotation (10r) of the element (10, 10') or are distributed equally; and/or wherein the electrical energy (E) provided depends on the number of inductances (14, 14a, 14b) and/or on the dimension of the inductances (14, 14a, 14b) and the existing magnetic field (M).

8. Machine according to one of the preceding claims, wherein the inductance (14, 14a, 14b) is arranged in a first half along the longitudinal axis, and/or wherein the load (16) is arranged in the second half along the longitudinal axis.

9. Machine according to one of the preceding claims, wherein the element (10, 10') has a tool holder for a tool (11) and/or a drill in a second half along the longitudinal axis.

10. Machine according to any of the preceding claims, wherein the element (10, 10') has a coupling for mechanical connection to a machine in a first half along the longitudinal axis.

11. Machine according to one of the preceding claims, wherein the element (10, 10') is a display, in particular a colored display or LED, which is designed to output status information or color-coded status information, or wherein the element (10, 10') has a display, in particular an acoustic display, which is designed to output status information or acoustic status information.

12. Machine according to one of the preceding claims with a drill chuck or drill holder comprising the element (10, 10').

13. Machine according to one of the preceding claims, wherein the coupling between the element (10, 10') and the rotating output (12, 12') is formed by a quick connect.

14. Machine according to one of the preceding claims, wherein one or more magnets (18) in the area of the output (12, 12') and/or in the area of the inductances (14, 14a, 14b) of the element (10, 10' ) are arranged on the machine, so that the magnets (18) remain at rest when the element (10, 10') rotates.

15. Machine according to one of the preceding claims, wherein a plurality of magnets (18) are arranged in a semicircle around the axis of rotation (10r) of the element (10, 10').

16. Machine according to one of the preceding claims, wherein a plurality of magnets (18) are arranged with alternating polarity and/or in the form of a Halbach array.