Rolling device attached to transport device for transporting at least one object and / or at least one person

Abstract

To provide a transport device for transporting at least one object and / or at least one person.SOLUTION: A drive element (4) is provided which is rotatable at least indirectly by means of a rolling device (3). The drive element (4) comprises at least two drive magnets (12). An output element (7) having at least two output magnets (15) is provided. The number of driving magnets (12) differs from the number of output magnets (15). At least one non-magnetic shielding element (5) is provided to change a direction of a magnetic field disposed between the drive element (4) and the output element (7). The output element (7) can be rotated. At least one stator winding (8) is disposed in which the output element (7) is rotatable about an axis of rotation (11) in order to generate current.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a transport device movable over a floor by means of at least one rolling device for transporting at least one object and / or at least one person.

[0002] A drive element is provided which can be rotated at least indirectly by the rolling device. [Background technology]

[0003] From DE 20 2016 000 172U1 a means of transport with an integrated energy generator is known.

[0004] The energy generator is connected to wheels on each side of the vehicle to generate electrical energy.

[0005] However, this known prior art has proven undesirable since the energy generator is positioned within the transport device in such a way that it can be damaged by the object or person being transported.

[0006] This energy generator configuration also reduces the storage volume for the transport device's objects.

[0007] In particular, the area available for transporting people is reduced by the placement of the energy generators. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Germany No. 202016 000 172U1 Summary of the Invention [Problem to be solved by the invention]

[0009] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a transport device for transporting at least one object and / or at least one person, which overcomes the above-mentioned drawbacks.

[0010] A further object of the invention is to provide a transport device that is technically uncomplicated and therefore inexpensive to manufacture.

[0011] It should be possible to reduce the number of components required to generate electrical current and to assemble them into compact configurations. [Means for solving the problem]

[0012] This problem is solved by a transport device that is movable on a floor by means of at least one rolling device for transporting at least one object and / or at least one person.

[0013] A drive element is provided which can be rotated at least indirectly by the rolling device.

[0014] The drive element includes at least two drive magnets.

[0015] Additionally, an output element is provided that includes at least two output magnets.

[0016] The number of drive magnets is different from the number of output magnets.

[0017] At least one non-magnetic shielding element is provided to redirect the magnetic field disposed between the drive element and the output element.

[0018] The output element can be rotated.

[0019] At least one stator winding is disposed within which the output element is rotatable about the axis of rotation to generate electrical current.

[0020] The above object is also achieved by a method for generating an electric current by means of the transport device.

[0021] [Transport device]

[0022] In the present invention, a transport means is understood to be an operable means for transporting objects and / or people.

[0023] The present invention includes transport devices that are pushed or pulled by a person. Additionally, transport devices are provided that are powered by muscle power, preferably human muscle power.

[0024] Preferably, the transport device is, but is not limited to, a pram, a sports pram, a multi-purpose pram, a buggy, or a baby cart.

[0025] The present invention also includes rehabilitation buggies and rehabilitation carts and / or wheelchairs.

[0026] The concept of transport device also includes baby carriages with foot rests.

[0027] The concept of transport device also includes shopping carts, hand carts and / or wheelbarrows.

[0028] The invention also includes a further single- or multi-axis transport device that is preferably driven by a person by having both feet of the person always positioned on the transport device during movement.

[0029] Here, the transport device may be a unicycle, or a two-wheeled vehicle, or a bicycle with at least three axles.

[0030] The present invention also includes a transport device that is moved by a person by at least temporarily pushing the transport device against the floor with the person's foot.

[0031] The present invention specifically includes as transportation devices hoverboards, rollers, shopping carts, skateboards, and / or Segways.

[0032] It will be apparent that the above are merely examples and are by no means exhaustive.

[0033] In the following, it is assumed that the transport device is a trolley suitcase, which moves on the floor by means of at least one rolling device.

[0034] [Rolling device]

[0035] The rolling device preferably refers to an object that surrounds the entire circumference of the wheels of the transport device, and the wheels roll on the floor via the rolling device.

[0036] The rolling device is preferably ring-shaped, and the rim and / or wheel collar of the wheel can preferably be inserted into the inner periphery of the rolling device.

[0037] The rolling device is at least partly made of rubber or plastic.

[0038] The rubber of the rolling device has a specific shape, the rubber can be connected to the drive element, and the rolling device can be cast together with the drive element.

[0039] The rolling device can also be made from other materials, such as wood or metal.

[0040] The rolling device may surround at least one rotatably mounted wheel.

[0041] [Driving Element]

[0042] According to the invention, the driving element refers to a ring-shaped annulus.

[0043] Here, the ring-shaped ring includes at least two magnets.

[0044] The drive element is at least indirectly connected to the rolling device.

[0045] The drive element can be connected to the rolling device in a frictional and / or materially and / or form-locking manner. It is also conceivable that the drive element is glued to the rolling device.

[0046] The drive element is arranged to be rotatable, and the rotation speed of the drive element corresponds to the rotation speed of the rolling device.

[0047] The drive element can rotate in the same direction as the rolling device or in the opposite direction.

[0048] The drive element preferably comprises two, but in particular a plurality of, magnets of different polarity.

[0049] Magnets of different polarities are connected to one another in a circular fashion to form a drive element.

[0050] The magnet disposed within the drive element is referred to as the drive magnet.

[0051] Output Elements

[0052] In the present invention, the term output element is understood to mean a ring-shaped structure, which includes at least two magnets of opposite polarity.

[0053] The number of magnets arranged on the output element is less than the number of magnets installed on the drive element.

[0054] The magnets arranged side by side in the output element are called output magnets.

[0055] The output element is ring-shaped and can rotate freely about an axis of rotation, in particular relative to the drive element.

[0056] The output element contains a high-quality neodymium magnet. This magnet is the most powerful magnet in the world. The output element has a simple shape. These are available on the market and can be used with some modifications.

[0057] The output element can be made of the same material as the drive element, and has a specific shape, which requires greater manufacturing precision.

[0058] [Occluding Elements]

[0059] Preferably, the shielding element comprises, but is not limited to, a non-magnetic ring.

[0060] In the following, a birdcage-shaped ring-shaped non-magnetic body is described as merely an example, and the non-magnetic body is at least partially made of metal.

[0061] The shielding element includes a plurality of metal pieces.

[0062] The metal piece may consist at least in part of steel.

[0063] The shielding element is preferably, but not limited to, located between the drive element and the output element.

[0064] The drive element and / or the shield element and / or the output element may all be ring-shaped.

[0065] The shielding element can be arranged inside the ring-shaped drive element.

[0066] The ring-shaped output element can be arranged inside the ring-shaped shielding element.

[0067] The shielding elements are made of high quality titanium (grade 1). The shielding elements are manufactured using conventional material removal techniques.

[0068] [Metal piece]

[0069] The metal piece is made of ferritic stainless steel.

[0070] They have relatively simple shapes and relatively small dimensions. Metal pieces require high manufacturing precision.

[0071] [Stator with stator windings]

[0072] The output element is located in the area of ​​the stator, which includes at least two electrical windings.

[0073] These electrical windings are connected together to form a ring, which forms the ring-shaped stator.

[0074] The output element is disposed between the electrical windings of the stator in an area surrounded by the electrical windings.

[0075] The output element may be formed as a stator.

[0076] The stator with stator windings preferably includes, but is not limited to, 120 turns of metal coils.

[0077] The coils are preferably wound around each other.

[0078] For example, but not limited to, 20 turns of the coil can be wound around each other with the same width as the width of the rolling device.

[0079] Preferably, but not limited to, layers containing six coil turns can be stacked one on top of the other.

[0080] This transport device has been found to be extremely advantageous as it can be over 90% efficient at generating electrical current.

[0081] The transport device for generating this current has proven to be extremely reliable.

[0082] There is no mechanical friction between the drive elements and / or the output elements and / or the shielding elements and / or the stator windings.

[0083] The absence of mechanical friction is due to the use of permanent magnets and metal pieces of the shielding elements.

[0084] The transport device for generating electric current is extremely easy to maintain, in particular due to the absence of mechanical friction between its components.

[0085] A highly corrosion-resistant alloy is used to manufacture the stator. The alloy can be easily manufactured using conventional manufacturing methods. The alloy can be manufactured on a 13-axis CNC machine. The alloy can be polished and coated.

[0086] The stator windings are made from commercially available copper wire, which does not require any further processing before assembly.

[0087] [Transportation device for generating electric current]

[0088] Movement of the transport device via human muscle power causes at least one rolling device to roll on the floor.

[0089] The drive element can be rotated at least indirectly by means of a rolling device.

[0090] For simplicity, but without limitation, it is assumed that the rotational speed of the rolling device matches the rotational speed of the drive element.

[0091] It is further assumed that the drive element is ring-shaped.

[0092] The drive element includes a plurality of magnets arranged side by side, the drive magnets forming a ring-shaped drive element.

[0093] Rotation of a drive element having a plurality of drive magnets generates a magnetic field.

[0094] The magnetic field includes a plurality of alternating north and south poles arranged side by side.

[0095] Rotation of the drive element about the axis of rotation causes the magnets, which are arranged as alternating north and south poles, to rotate about the axis of rotation as well.

[0096] An output element is arranged in the area of ​​the drive element.

[0097] The drive element includes at least two magnets, each forming a north pole and a south pole.

[0098] The number of magnets in the output element is less than the number of magnets in the drive element.

[0099] A magnetic field is disposed between the drive element and the output element.

[0100] The shielding element is preferably arranged between the drive element and the output element.

[0101] The shielding element alters the magnetic field that can form between the drive element and the output element.

[0102] Rotation of the drive element and its associated magnet causes the output element to rotate about the axis of rotation.

[0103] Here the output element comprises two magnets, two north poles and two south poles each.

[0104] The output element rotates about the axis of rotation at a rotational speed that is higher than the rotational speed of the drive element.

[0105] The metal strips of the shielding element alter the magnetic field disposed between the drive element and the output element.

[0106] The change in the magnetic field between the drive element and the output element multiplies the number of rotations of the output element about its axis of rotation by the number of rotations of the drive element about its axis of rotation.

[0107] The magnetic field between the drive element and the output element is changed by the metal pieces of the shielding element, thereby increasing the rotation speed of the output element about its axis of rotation.

[0108] The metal pieces of the shielding element are held within the shielding element.

[0109] By way of example only, and not limitation, it is assumed that the shielding element is a mechanical ring structure, with metal strips distributed over the ring shape of the shielding element, preferably in the direction of the axis of rotation.

[0110] The output element rotates around its axis of rotation in the region of the stator winding.

[0111] An output magnet of the output element rotates within the at least two stator windings, generating a voltage in the stator windings.

[0112] The generation of voltage corresponds to the production of electrical energy.

[0113] Electrical energy that can be generated by the transport device can be transferred to an electrical energy storage device, preferably a battery.

[0114] [Embodiments of the present invention]

[0115] In one embodiment of the invention, the drive elements and / or the output elements and / or the shielding elements and / or the stator windings are arranged in the rolling device.

[0116] In this way, all components arranged in the transport device for generating the electric current are arranged in the rolling device.

[0117] This protects the components of the transport device that contribute to the generation of electrical energy from further damage.

[0118] The storage space for storing the object of the transport device is not occupied by components for generating electric current.

[0119] Preferably, the human usable area within and / or on the transport device is not reduced.

[0120] A further embodiment of the invention provides that the drive element is a rolling device.

[0121] The current generating components of the transport device include at least one drive element and / or at least one rolling device and / or at least one output element and / or at least one shielding element and / or at least one stator winding.

[0122] The current-generating components of the transport device are spatially enclosed within the rolling device.

[0123] In this case, the rolling device may be identical to the drive element.

[0124] The drive element can be rotated about the axis of rotation directly or at least indirectly by a rolling device.

[0125] According to a further embodiment of the invention, the rolling device of the transport device comprises one wheel.

[0126] The wheels are adapted in size and / or width and / or circumference to the size and / or circumference of the space of the transport device.

[0127] The wheel may have an opening to accommodate the hub.

[0128] The wheels can also be formed as disks and have a storage device.

[0129] The wheels are at least partially made of metal and have rolling devices located radially around their outer peripheries, allowing the wheels to roll on the floor.

[0130] A further embodiment of the invention provides that at least one drive magnet and / or at least one output magnet is configured as a permanent magnet.

[0131] It is further provided that the number of drive magnets is greater than the number of output magnets.

[0132] The magnets of the greater number of drive elements and the magnets of the lesser number of output elements function as magnetic gears.

[0133] The magnetic gear has a large difference between the rotational speed of the drive element and the rotational speed of the output element.

[0134] The rotational speed of the drive element is transmitted from the rolling device to the drive element.

[0135] In response, the rotational speed of the output element is converted into electrical energy via the stator windings.

[0136] This allows for a high efficiency in the generation of electrical current by the transport device, which is not impaired by mechanical friction: no lubrication is required for mechanical parts moving relative to one another.

[0137] In another embodiment of the invention, it is provided that the drive element is formed in the shape of a ring, the ring-shaped drive element being provided with a plurality of drive magnets arranged next to each other.

[0138] Due to their ring-shaped design, the drive elements can be arranged in one wheel, but they can also be arranged in rolling devices that are shaped in other ways.

[0139] The side-by-side arrangement of north and south poles of the drive magnets results in a particularly large increase in the rotational speed at which the output element rotates about its axis of rotation.

[0140] The transmission of the increased rotational speed from the drive element to the output element can therefore be carried out without being impaired by friction losses.

[0141] In another embodiment of the invention, the drive elements and / or the output elements and / or the shielding elements and / or the stator windings are arranged side by side in a non-contact manner.

[0142] The generation of electrical energy in the transport device can thus be generated without further mechanical losses, particularly in the form of friction.

[0143] Additionally, there is no need for maintenance or repair by lubricating mechanically interacting components.

[0144] The invention for generating electrical energy can be applied to any modified transport device, and depending on the size, weight and circumference of the transport device, the components provided for generating electrical energy can be larger or smaller in size.

[0145] Adjusting the size and / or increasing the rotational speed of the output element is done by increasing or decreasing the number of drive magnets in the drive element.

[0146] Additionally, the number of metal pieces in the shielding element can be increased or decreased.

[0147] Furthermore, it is provided that the rolling device can be connected to a drive element.

[0148] The components of the transport device provided for generating the electrical current are free to move relative to one another.

[0149] The freedom of movement of all components relative to one another is ensured by the air gap.

[0150] The drive element is at least indirectly connected to the rolling device in order to transfer to the drive element the kinetic energy imparted to the rolling device by the rolling device moving over the floor.

[0151] The connection of the rolling device with the drive element can be frictionally and / or materially and / or form-locking.

[0152] The drive elements can be cast into the rolling device made of rubber.

[0153] The drive element is rigidly connectable to the rolling device.

[0154] Another embodiment of the invention provides that the electrical current generated in the transport device can be transferred from the stator windings to a storage device for electrical energy.

[0155] The storage device for electrical energy is preferably a battery.

[0156] For transmitting electrical energy, conductors are preferably arranged on the rolling device.

[0157] The conductor may be a cable for direct current or alternating current.

[0158] The cable is connected via a cable output to a region of the rolling device that is not rotatable about the rotation axis, preferably to a hub.

[0159] The connection of the conductors from the stator windings to the current storage device can be transmitted to each rolling device.

[0160] By way of example only, and not limitation, current is transmitted from the stator to the current storage device through at least one slip ring contact.

[0161] There is no requirement for additional mechanical bearings.

[0162] The battery is positioned in the transport device in a manner that maintains easy access to the battery.

[0163] The battery can be configured as a battery cell that can be removed by a person from the transport device and used as a mobile source of electrical current.

[0164] The electrical energy generated by the transport device can be temporarily stored in a battery, and the electrical energy generated in the transport device can be used, in particular, to charge mobile phones and / or laptops and / or other electronic devices.

[0165] [Calculation and system description]

[0166] Preferably, a neodymium magnet is used as the permanent magnet.

[0167] The permanent magnet preferably has a strength of 14,000 gauss, which corresponds to a magnetic induction.

[0168] B=1.4T-magnetic induction e p =B*1*V - voltage induced in the conductor e m = 2*ep - voltage induced in one of the coils e nom =w*em-total induced voltage w=120 - total number of coils l=15[mm] - effective length of coil V-coil (or rolling device) linear velocity V=w*R-Rotational speed of rolling device*Outer radius of rolling device R=40[mm]-outer radius n=250[min-1]-Rotation per minute of the rolling device TIFF2025186326000002.tif11170e p =B*l*V=1.4*0.015*1=0.022[V] e m =2*e p=0.022=0.044[V] e nom =w*e m =5.28[V]

[0169] This charge is related to the coils connected in series. This charge corresponds to an AC voltage and needs to be converted to a DC voltage. This conversion is done using a simple diode. The charge is converted to a DC current. Converting charge to a DC current is necessary, for example, to charge a mobile phone.

[0170] In other cases, additional electronic devices are integrated into the battery.

[0171] The battery used is a lithium polymer (Lipol) battery.

[0172] This type of battery can be cast into any desired shape.

[0173] The dimensions of the battery, including all electronics, must not exceed 80 x 50 x 10 mm.

[0174] Due to the frictionless configuration of the rolling device (preferably in wheels), the electrical energy generated is proportional to the weight of the transport device (preferably a trolley suitcase).

[0175] This means that heavier suitcases are more efficient at generating electrical energy.

[0176] Once the trolley suitcase is in motion, it is not difficult to keep it in motion while generating electrical energy.

[0177] P=(φ*F μ *d*) / 318310=(0.5*22.5*80*1000) / 318310=22.92[W] - Potential strength of the generator φ=0.5 - efficiency factor F μ=μ*F=0.9*25=22.05[N] - Friction force of each wheel μ=0.9 - coefficient of friction F=0.25*G*g=25[N] - force of the trolley suitcase on the rolling device (preferably each wheel) d [mm] - circumference of rolling device (wheel)

[0178] The value 1000 is converted to W in the formula for converting units of KW above.

[0179] P=l*U - generator electrical energy U=5[V] - DC voltage for charging the battery l=P / U=4.5[A] - Current flowing to the battery

[0180] According to the theoretical calculation of the electrical energy generated by the wheels, the mechanism according to the invention is preferably installed in each of the two wheels, which generates a sufficient amount of electrical energy for fast or short-time charging.

[0181] The system according to the invention can also be adapted for further wheels. When using four wheels, it is also conceivable to use the system according to the invention for charging a laptop.

[0182] [Rolling device parts - weight and materials]

[0183] [Table 1]

[0184] Material Properties

[0185] 1. Aluminum alloy 5052 is an aluminum alloy that preferably contains magnesium and chromium as components. Aluminum alloy 5052 has extremely high corrosion resistance and good formability. The alloy also has good processability.

[0186] 2. 0.5mm diameter copper wire is widely available and needs no further explanation.

[0187] 3. Titanium (Grade 1) has excellent formability. Titanium has excellent corrosion resistance and high impact strength.

[0188] 4. Group 5 Ferritic Stainless Steels (446, 445, and 447). This particular group of stainless steels has a relatively high chromium content. This chromium content provides excellent corrosion resistance. Because of the magnetic field changes mentioned above, magnetic stainless steels are used instead of austenitic stainless steels.

[0189] 5. Neodymium magnets are the most powerful magnets available commercially. They are necessary for optimal efficiency and performance in generating electrical current in transportation devices.

[0190] 6. Conventional rubber is used to manufacture rolling devices.

[0191] [Other Components]

[0192] [Table 2] Further examples and embodiments of the present invention will now be described in more detail with reference to the drawings. [Brief explanation of the drawings]

[0193] [Figure 1] FIG. 1 is a diagram illustrating components of a transport device for generating electrical current. [Figure 2] FIG. 2 shows a rolling device with contacts for transmitting current to a battery. [Figure 3] FIG. 3 shows slip ring contacts for transferring current to the battery. [Figure 4] FIG. 4 shows a rolling device with a yoke for guiding the rolling device. Example 1

[0194] FIG. 1 shows, from right to left, a rubber sheath 1 of a wheel 2 for a transport device 23 (not shown).

[0195] The rolling device 3 comprises a component group 18 of a rubber sheath 1 , a drive element 4 and a shielding element 5 .

[0196] The shielding element 5 comprises at least two metal pieces 6 .

[0197] The rolling device 3 comprises as further components at least one output element 7 and a stator winding 8 .

[0198] FIG. 1 also shows the rim 9 of the rolling device 3 .

[0199] Reference numeral 10 denotes electrical contacts which serve to transmit the generated electrical energy.

[0200] Reference numeral 11 denotes the axis of rotation for the rotation of the drive element 4 and the output element 7 .

[0201] The drive element 4 includes drive magnets 12 , each drive magnet 12 including one north pole 13 and one south pole 14 .

[0202] The output element 7 includes output magnets 15 , each of which includes one north pole 16 and one south pole 17 .

[0203] Figure 2 shows a wheel 2 with a rolling device 3. Radially inside the rolling device 3 a rim 9 is shown.

[0204] The contacts 10 function to transmit electrical energy generated by the components 18 .

[0205] FIG. 3 shows slip ring contacts 19 that carry electrical energy generated by components 18 of rolling device 3 from contacts 10 of rolling device 3 to a battery (not shown).

[0206] The reference numbers 20 and 21 indicate the wire (20) through which the current comes from the rolling device and the wire (21) that goes to the battery.

[0207] FIG. 4 shows the rolling device 3 of FIG.

[0208] Reference number 22 denotes a yoke by means of which the rolling device 3 or wheel 2 is fixed to the transport device 23.

[0209] Reference number 24 indicates a consumer of current (for example a mobile phone), which can be charged with the current generated by the component group 18 in the area of ​​the rolling device 3 . [Explanation of symbols]

[0210] 1 Rubber exterior 2 wheels 3 Rolling device 4 Driving Elements 5. Obscuration Elements 6 metal piece 7 Output Elements 8 Stator Winding 9 rims 10 Contacts 11 Rotation axis 12 Drive magnet 13 N pole 14 S pole 15 Output Magnet 16 N pole 17 S pole 18 Components 19 slip ring contacts 20 Electric wire 21 Electric wire 22 York 23 Transport equipment 24 Mobile Phones

Claims

1. A transport device (23) movable on a floor by at least one rolling device (3) for transporting at least one object and / or at least one person, A transport device (23) comprising a drive element (4) that can be rotated at least indirectly by a rolling device (3), The drive element (4) comprises at least two drive magnets (12), an output element (7) having at least two output magnets (15); The number of the drive magnets (12) is different from the number of the output magnets (15), At least one non-magnetic shielding element (5) is provided to redirect the magnetic field disposed between the drive element (4) and the output element (7), The output element (7) is rotatable, A transportation device (23) characterized in that at least one stator winding (8) is arranged in the at least one stator winding (8), and the output element (7) is rotatable around a rotation axis (11) in order to generate an electric current.

2. 2. The transportation device (23) according to claim 1, characterized in that the drive element (4) and / or the output element (7) and / or the shielding element (5) and / or the stator winding (8) are arranged in the rolling device (3).

3. 2. A transport device (23) according to claim 1, characterized in that the drive element (4) is the rolling device (3).

4. 4. Transport device (23) according to one or more of claims 1, 2 or 3, characterized in that the rolling devices (3) comprise wheels (2).

5. 2. The transport device (23) according to claim 1, characterized in that the drive magnet (12) and / or the output magnet (15) are formed as permanent magnets.

6. 3. The transport device (23) according to claim 1 or 2, characterized in that the drive element (4) is formed in the shape of a ring and comprises a plurality of drive magnets (12) arranged next to each other.

7. 2. A transport device (23) according to claim 1, characterized in that the rotational speed of the output element (7) is higher than the rotational speed of the drive element (4).

8. 2. A transport device (23) according to claim 1, characterized in that the shielding element (5) comprises at least two metal pieces (6).

9. 2. A transport device (23) according to claim 1, characterized in that the output element (7) is arranged freely rotatable about a rotation axis (11).

10. 2. The transport device (23) of claim 1, wherein the number of drive magnets (12) is greater than the number of output magnets (15).

11. 10. A transport device (23) according to one or more of the preceding claims, characterized in that the drive elements (4) and / or the output elements (7) and / or the shielding elements (5) and / or the stator windings (8) are arranged side by side in a non-contacting manner.

12. 10. A transport device (23) according to one or more of the preceding claims, characterized in that the rolling device (3) is connectable to the drive element (4).

13. 2. A transport device (23) according to claim 1, characterized in that it is possible to transfer current from the stator winding (8) to a battery.

14. 2. The transport device (23) according to claim 1, characterized in that the transport of the electric current to the battery can be carried out by means of slip ring contacts (19).

15. 2. A method for generating an electric current by a transport device (23) according to claim 1, comprising: The rolling device (3) is moved on the floor, The driving element (4) is rotated at least indirectly by the rolling device (3), wherein at least two drive magnets (12) are arranged on the drive element (4), The number of the drive magnets (12) is different from the number of the output magnets (15), At least one non-magnetic shielding element (5) is provided to redirect the magnetic field disposed between the drive element (4) and the output element (7), Here, the output element (7) is rotated, 1. A method according to claim 1, characterized in that at least one stator winding (8) is arranged in which the output element (7) rotates to generate a current.

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