Transport device for transporting at least one object and / or person

Abstract

The invention relates to a transport device which can be moved on the ground by means of at least one rolling device (3) for transporting at least one object and / or person. A drive element (4) is provided so that the drive element can be rotated at least indirectly via the rolling device (3). The drive element (4) comprises at least two drive magnets (12). A driven element (7) is provided so that the driven element has at least two driven magnets (15). The number of the drive magnets (12) is different from the number of the driven magnets (15). At least one non-magnetic shielding element (5) is provided in order to change the orientation of the magnetic field arranged between the drive element (4) and the driven element (7). The driven element (7) can be rotated. At least one stator winding (8) is arranged in which the driven element (7) can be rotated around an axis of rotation (11) to generate an electric current.

Description

Background Art

[0001] The invention relates to a transport device which can be moved on a ground surface by means of at least one rolling device for the purpose of transporting at least one object and / or person.

[0002] A drive element is provided, which can be rotated at least indirectly via the rolling device.

[0003] A vehicle is known from DE 20 2016 000 172 U1, which comprises an integrated generator.

[0004] Energy generators are connected to wheels located on both sides of the vehicle to generate electrical energy.

[0005] However, the known prior art proves to be disadvantageous because the energy generator is arranged in the transport device in such a way that it is exposed to damage by transported objects or persons.

[0006] Furthermore, the arrangement of the energy generator reduces the receiving volume of the transport device for objects. In particular, the support surface available for transporting people Reduced due to the positioning of the energy generator.

[0007] Purpose of the Invention

[0008] It is therefore an object of the present invention to provide a transport device for transporting at least one object and / or person which avoids the above-mentioned disadvantages.

[0009] Another object of the invention is to provide a transport device which is less technically complex and can therefore be manufactured more cheaply.

[0010] It should be possible to reduce the number of components required for generating the current and to integrate them in a space-saving arrangement.

[0011] Solution

[0012] These objects are achieved by a transport device which can be moved on a ground surface by means of at least one rolling device for the purpose of transporting at least one object and / or person.

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

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

[0015] Furthermore, an output element is provided which has at least two output magnets.

[0016] The number of the driving magnets is different from the number of the driven magnets.

[0017] In order to change the orientation of a magnetic field arranged between the drive element and the output element, at least one nonmagnetic shielding element is provided.

[0018] The driven element can be caused to rotate.

[0019] At least one stator winding is arranged in which the driven element can rotate about an axis of rotation in order to generate electric current.

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

[0021] Transport device

[0022] The present invention understands a means of transport as a moving equipment for transporting objects and / or persons.

[0023] The present invention includes a transport device that is pushed or pulled by a person. In addition, a transport device that is driven by preferably human muscle power is also proposed.

[0024] Preferably, but not in any way exclusively, the transport device is a pram, a sports stroller, a combination stroller, a buggy or a stroller.

[0025] The invention also includes a rehabilitation stroller, a rehabilitation cart and / or a wheelchair.

[0026] The term "transportation device" also includes strollers having a pedal function.

[0027] The term "transportation device" also includes shopping trolleys, hand trucks and / or wheelbarrows.

[0028] Furthermore, the invention also includes other single-axle or multi-axle transport devices which are preferably driven by a person in that the person's feet are always on the transport device during forward movement.

[0029] In this case, the transport device can be a unicycle or a two-wheeled vehicle or a bicycle having at least three axles.

[0030] The invention also includes transport devices that are moved by a person at least temporarily pushing the transport device off the ground with their feet.

[0031] The invention comprises in particular a hoverboard, a two-wheeled skateboard, a shopping trolley, a skateboard and / or a Segway as a transport device.

[0032] It will be appreciated that the above list is exemplary only and is by no means exhaustive.

[0033] It will be assumed below that the transport device is a rolling luggage case. The rolling luggage case is moved on the ground by means of at least one rolling device.

[0034] Rolling device

[0035] A rolling device is an object which preferably completely surrounds the wheels of the transport device. The wheels roll on the ground by means of the rolling device.

[0036] The rolling device is preferably designed to be annular. Preferably, the wheel rim and / or the flange of the wheel can be embedded in the inner periphery of the rolling device.

[0037] The rollers are at least partially made of rubber or of plastic.

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

[0039] The rolling device may also be made of any other material such as wood or metal.

[0040] The rolling device can encompass at least one rotatably mounted wheel.

[0041] Drive components

[0042] According to the present invention, the driving element is an annular ring.

[0043] Here, the annular 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 force-fitting and / or material-fitting and / or form-fitting manner. It is conceivable that the drive element is bonded to the rolling device.

[0046] The driving element is arranged in a rotatable manner. The rotation speed of the driving element is consistent with the rotation speed of the rolling device.

[0047] The drive element may rotate in the same direction as or in the opposite direction to the rolling means.

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

[0049] These magnets with different polarities are connected to one another in a circle in order to form a drive element.

[0050] The magnets arranged in the drive element are called drive magnets.

[0051] Driven element

[0052] The invention understands the driven element as an annular structure. The driven element comprises at least two magnets with opposite polarities.

[0053] The number of magnets arranged in the driven element is smaller than the number of magnets located in the drive element.

[0054] The magnets arranged side by side in the driven element are referred to as driven magnets.

[0055] The driven element is designed in an annular shape and can be freely rotated about a rotation axis relative to the drive element.

[0056] The driven element consists of high-quality neodymium magnets. These magnets are the strongest in the world. The driven element has a simple shape. It is commercially available and can be installed with only minor modifications.

[0057] The driven element can be made of the same material as the driving element. The driven element has a specific shape. Therefore, the driven element requires more precise manufacturing accuracy.

[0058] Shielding components

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

[0060] In the following, purely by way of example, an annular non-magnetic body in the form of a cage is assumed. The non-magnetic body consists at least partially of metal.

[0061] The shielding element comprises a plurality of metal segments.

[0062] The metal segment may be at least partially made of steel.

[0063] Preferably, but not exclusively, the shielding element is arranged between the drive element and the driven element.

[0064] The drive element and / or the shielding element and / or the driven element may each be designed in an annular shape.

[0065] The shielding element can be arranged inside the drive element which is designed in an annular shape.

[0066] The annular driven element can be positioned inside the annular 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 Segment

[0069] The metal segment is made of ferritic stainless steel. Its shape is relatively simple and its size is small. The metal segment requires high manufacturing precision.

[0070] Stator with stator winding

[0071] The driven element is arranged in the region of the stator. The stator comprises at least two electrical windings.

[0072] The electrical windings are connected to each other in a ring shape. These electrical windings form a ring-shaped stator.

[0073] The driven element is arranged between the electrical windings in a region surrounded by the electrical windings of the stator.

[0074] The driven element can be designed as a stator.

[0075] Preferably, but not exclusively, the stator with the stator winding may comprise 120 metal coils.

[0076] The coils are preferably wound around one another.

[0077] By way of example but not in any way exclusive, 20 coils are wound around each other so that they can correspond in width to the width of the rolling device.

[0078] Preferably, but not exclusively, six layers comprising coils may overlap each other.

[0079] The transport device has proven to be extremely advantageous, since the efficiency of generating electric current can be higher than 90%.

[0080] The transport device for generating electric current has proven to be extremely reliable.

[0081] There is no mechanical friction between the drive element and / or the driven element and / or the shielding element and / or the stator winding.

[0082] The absence of any mechanical friction is due to the use of permanent magnets and metal segments of the shielding elements.

[0083] The transport device for generating electric current is extremely easy to maintain, in particular due to the lack of mechanical friction between the components.

[0084] A highly corrosion resistant alloy is used to manufacture the stator. This alloy is easy to manufacture using conventional manufacturing methods. This alloy can be manufactured on a 13-axis CNC machine. This alloy can be polished and painted.

[0085] Commercially available copper wire is used to manufacture the stator windings. No further processing of the wire is required before assembly.

[0086] Transport device for generating electric current

[0087] The at least one rolling device rolls on the ground by moving the transport device using human muscle power.

[0088] The drive element can be rotated at least indirectly via the rolling device.

[0089] For the sake of simplicity, but not in any way exclusive, it is assumed that the rotation speed of the rolling device coincides with the rotation speed of the drive element.

[0090] It is further assumed that the drive element is designed in the shape of a ring.

[0091] The drive element comprises a plurality of magnets arranged side by side. These drive magnets form an annular drive element.

[0092] The magnetic field is generated by the rotation of a drive element having a plurality of drive magnets.

[0093] The magnetic field includes a plurality of N poles and S poles arranged alternately side by side.

[0094] As the drive element rotates about the rotation axis, the magnets arranged alternately as N poles and S poles also rotate about the rotation axis.

[0095] An output element is arranged in the region of the drive element.

[0096] The driving element includes at least two magnets, and the at least two magnets respectively constitute an N pole and an S pole.

[0097] The number of magnets of the driven element is smaller than the number of magnets of the driving element.

[0098] A magnetic field is arranged between the drive element and the driven element.

[0099] The shielding element is preferably positioned between the drive element and the driven element.

[0100] The shielding element modifies the magnetic field that may be formed between the driver element and the driven element.

[0101] As the drive element and the associated magnet rotate, the output element can be rotated about the axis of rotation.

[0102] In this case, the output element accordingly has two magnets, each of which has two N poles and two S poles.

[0103] The driven element rotates about the rotation axis at a rotation speed that is higher than the rotation speed of the drive element.

[0104] The metal segments of the shielding element modify the magnetic field arranged between the driver element and the driven element.

[0105] The change in the magnetic field between the drive element and the driven element results in the number of rotations of the driven element about the axis of rotation being multiplied by the number of rotations of the drive element about the axis of rotation.

[0106] The change in the magnetic field between the drive element and the output element due to the shielding element with its metal sections leads to an increase in the rotational speed of the output element about the rotational axis.

[0107] The metal segments of the shielding element are held in the shielding element.

[0108] Purely by way of example and not in any way exclusive, it is assumed that the shielding element is a mechanical annular structure. The metal segments are preferably distributed over the annular shape of the shielding element in the direction of the axis of rotation.

[0109] The output element rotates in the region of the stator winding about its axis of rotation.

[0110] As a driven magnet of the driven element rotates within the at least two stator windings, a voltage is generated in the stator windings.

[0111] The generation of voltage corresponds to the generation of electrical energy.

[0112] The electrical energy that can be generated by means of the transport device can be discharged to an electrical energy store, preferably to a battery.

[0113] Embodiments of the present invention

[0114] In one embodiment of the invention, the drive element and / or the driven element and / or the shielding element and / or the stator windings are arranged in the rolling device.

[0115] In this way, all components arranged in the transport device for generating electric current are arranged in the rolling device.

[0116] Components of the transport device for generating electrical energy are thereby protected from further damage.

[0117] The receiving space of the transport device for receiving objects is not occupied by components for generating electricity.

[0118] Preferably, the support surface for a person in and / or on the transport device is not reduced.

[0119] Another embodiment of the present invention provides that the drive element is the rolling device.

[0120] The components of the transport device for generating electricity include at least one drive element and / or at least one rolling device and / or at least one driven element and / or at least one shielding element and / or at least one stator winding.

[0121] The components of the transport device for generating electricity are spatially contained in the rolling device.

[0122] In this case, the rolling device can coincide with the drive element.

[0123] The drive element can be rotated about the axis of rotation directly or at least indirectly via the rolling device.

[0124] According to another embodiment of the invention, the rolling device of the transport device encompasses the wheels.

[0125] The wheels are adapted in terms of their size and / or width and / or circumference to the size and / or spatial circumference of the transport device.

[0126] The wheel may have a split for receiving the hub.

[0127] The wheel can also be designed as a disk or have spokes.

[0128] The wheel is at least partially made of metal. A rolling device is provided in the radial direction of the outer circumference of the wheel. The wheel rolls on the ground by the rolling device.

[0129] A further embodiment of the invention provides that the at least one drive magnet and / or the at least one driven magnet are designed as permanent magnets.

[0130] Furthermore, it is proposed that the number of driving magnets is greater than the number of driven magnets.

[0131] The larger number of magnets in the drive element and the smaller number of magnets in the driven element act as a magnetic transmission.

[0132] Magnetic transmissions have a driving element with a rotational speed that is significantly different than the rotational speed of a driven element.

[0133] The rotational speed of the drive element is transmitted to the drive element by the rolling device.

[0134] The rotation speed of the driven element is converted into electrical energy through the stator winding.

[0135] This allows high efficiency to be achieved when generating electricity via the transport device. This high efficiency is not reduced by mechanical friction. No mechanical parts that move relative to one another need to be lubricated.

[0136] In another embodiment of the present invention, it is proposed that the drive element is designed to be annular. A plurality of drive magnets arranged side by side are provided in the annular drive element.

[0137] Due to its annular design, the drive element can be arranged in the wheel. The drive element can also be positioned in rolling devices designed in other ways.

[0138] The side-by-side arrangement of the N poles and S poles of the plurality of driving magnets allows the rotation speed of the driven element around the driven element rotation axis to be significantly increased.

[0139] Therefore, the increase in the number of rotations can be transmitted from the driving element to the driven element without being affected by any friction loss.

[0140] A further embodiment of the present invention provides that the drive element and / or the output element and / or the shielding element and / or the stator winding are arranged next to each other in a contactless manner.

[0141] In this way, electrical energy can be generated in the transport device without further mechanical losses, in particular in the form of friction.

[0142] No additional maintenance and servicing work by lubricating mechanically interacting parts is required.

[0143] The invention can be applied to any type of transport device for the purpose of generating electrical energy. The size of the components provided for generating electrical energy can be increased or decreased depending on the size, weight and girth of the transport device.

[0144] The size and / or degree of increase in the rotational speed of the driven element may be adjusted by increasing or decreasing the number of drive magnets in the drive element.

[0145] Additionally, the number of metal segments in the shielding element may be increased or decreased.

[0146] Furthermore, it is proposed that the rolling device can be connected to the drive element.

[0147] The parts of the transport device which are provided for generating electric current can move freely relative to one another.

[0148] Accordingly, free mobility of the components relative to one another is ensured by the air gap.

[0149] In order to transmit the kinetic energy introduced into the rolling device by moving the rolling device on the ground to the drive element, the drive element is at least indirectly connected to the rolling device.

[0150] The rolling device and the drive element can be connected in a force-fitting and / or materially bonded and / or form-fitting manner.

[0151] The drive element can be cast in a roller assembly made of rubber.

[0152] The drive element can be fixedly connected to the rolling device.

[0153] A further embodiment of the invention provides that the electric current generated in the transport device can be transferred from the stator winding to a store for electrical energy.

[0154] The storage device for the electrical energy is preferably a battery.

[0155] In order to discharge the electrical energy, electrical conductors are preferably provided on the rolling device.

[0156] Electrical conductors are wires used for direct or alternating current.

[0157] The cable is connected via a cable outlet to a region of the rolling device that is not rotatable about the axis of rotation, preferably a hub.

[0158] The connection of the electrical conductors from the stator windings to the current reservoir can be passed to any rolling device.

[0159] Purely by way of example and not in any way exclusive, the current can be transferred from the stator to the current reservoir via at least one slip ring contact.

[0160] The need for additional mechanical supports is eliminated.

[0161] The battery is arranged in / on the transport device in such a way that easy access to the battery is ensured.

[0162] The battery can be designed as a battery unit. The battery unit can be removed from the transport device and used as a portable power source.

[0163] The electrical energy generated by means of the transport device can be temporarily stored in the battery. The electrical energy generated in the transport device is used in particular for charging a mobile phone and / or a laptop and / or any other electronic device.

[0164] Example

[0165] Systematic calculation and interpretation

[0166] Neodymium magnets are preferably used as permanent magnets.

[0167] The strength of the permanent magnet is preferably 14000 Gauss. This corresponds to magnetic induction.

[0168] B = 1.4T - magnetic induction

[0169] e p =B*1*V-voltage induced in the conductor

[0170] e m =2*e p - the voltage induced in one of the coils

[0171] e nom =w*e m -Total induced voltage

[0172] w=120-total number of coils

[0173] 1=15[mm]-active coil length

[0174] V-Linear speed of coil (or rolling device)

[0175] V = w*R-rotation frequency of rolling device*outer radius of rolling device

[0176] R=40[mm]-outer radius

[0177] n=250[min -1 ]-Rotation per minute of the rolling device

[0178] V = [1m / s] - linear speed of the rolling luggage

[0179] e p =B*1*V=1.4*0.015*1=0.022[V]

[0180] e m =2*e p =0.022=0.044[V]

[0181] e nom =w*e m =5.28[V]

[0182] This charge is based on coils that are connected in series with each other. This charge corresponds to an AC voltage and must be converted into a DC voltage. The conversion is done by using a simple diode. The charge is converted into DC. In order to charge a mobile phone, for example, the charge needs to be converted into DC.

[0183] Any other additional electronics are integrated into the battery.

[0184] A Li-pol polymer lithium battery was used as a battery.

[0185] This type of battery can be molded into any desired shape.

[0186] The dimensions of the battery including all electronics should not exceed 80 x 50 x 10 mm.

[0187] Due to the frictionless design of the rolling device, preferably in the form of a wheel, the electrical energy generated is proportional to the weight of the transport device, preferably a rolling luggage case.

[0188] This means that heavier luggage is more efficient at generating electricity.

[0189] Once the rolling luggage is set in motion, it is not difficult to keep the rolling luggage in motion while the electrical energy is generated.

[0190]

[0191] - Potential strength of the generator

[0192]

[0193] F μ = μ * F = 0.9 * 25 = 22.05 [N] - Friction force on each individual wheel

[0194] μ=0.9-friction coefficient

[0195] F = 0.25*G*g = 25 [N] - force of the rolling luggage relative to the rolling device (preferably: independent wheels)

[0196] d[mm] - outer circumference of the rolling device (wheel)

[0197] In the previous formula, the value 1000 is used to convert the units from KW to W.

[0198] P=1*U-electric energy of generator

[0199] U=5[V]- Direct voltage for charging the battery

[0200] 1 = P / U = 4.5 [A] - current flowing to the battery

[0201] According to theoretical calculations of the electrical energy generated by the wheels, it is preferred to install the mechanism of the present invention in two wheels respectively. Thus, sufficient electrical energy is generated for rapid charging or for short-term charging.

[0202] The system of the present invention can also be applied to more wheels. As long as four wheels are used, the system of the present invention can be used to charge a laptop.

[0203] Components of rolling devices - weights and materials

[0204]

[0205]

[0206] Material properties

[0207] 1. Aluminum alloy 5052 is an aluminum alloy preferably including magnesium and chromium as components. Aluminum alloy 5052 has excellent corrosion resistance and good forming properties. In addition, the alloy is easy to process.

[0208] 2. Copper wire with a diameter of 0.5 mm is widely used and needs no further explanation.

[0209] 3. Titanium (Grade 1) has excellent plasticity. It has excellent corrosion resistance and high notch impact strength.

[0210] 4. Class 5 Ferritic Stainless Steels (446, 445 and 447): This specialty stainless steel category has a relatively high chromium content. The chromium content achieves superior corrosion resistance. Magnetic stainless steels are used instead of austenitic stainless steels because of the changing magnetic field as described above.

[0211] 5. Neodymium magnets are the strongest magnets commercially available. Neodymium magnets are needed to optimize the efficiency and ability to generate electrical current in transportation devices.

[0212] 6. Use conventional rubber to make rolling devices.

[0213] Other components

[0214]

[0215]

[0216] Further examples and embodiments of the invention are explained in detail with reference to the drawings.

[0217] In the attached picture:

[0218] Figure 1 showing components of a transport device for generating electric current,

[0219] Figure 2 A rolling device with contacts for conducting current to a battery is shown,

[0220] Figure 3 shows the slip ring contacts used to transfer current to the battery, and

[0221] Figure 4 A rolling device is shown with a fork for guiding the rolling device.

[0222] Figure 1 From right to left, rubber sleeves 1 are shown for wheels 2 of a transport device 23 (not shown).

[0223] The rolling device 3 includes components 18 such as a rubber sleeve 1 , a driving element 4 and a shielding element 5 .

[0224] The shielding element 5 comprises at least two metal segments 6 .

[0225] Other components included in the rolling device 3 are at least one driven element 7 and a stator winding 8 .

[0226] exist Figure 1 Also shown is the wheel rim 9 of the rolling device 3 .

[0227] Reference numeral 10 denotes an electrical contact for conducting away the generated electrical energy.

[0228] Reference numeral 11 denotes an axis of rotation for the rotation of the drive element 4 and for the rotation of the output element 7 .

[0229] The driving element 4 includes driving magnets 12 , wherein each driving magnet 12 includes an N pole 13 and an S pole 14 .

[0230] The driven element 7 includes a driven magnet 15 having an N pole 16 and an S pole 17 , respectively.

[0231] Figure 2 The wheel 2 is shown with a rolling device 3. Radially inside the rolling device 3, a rim 9 is shown.

[0232] The contacts 10 serve to discharge the electrical energy generated by means of the component 18 .

[0233] Figure 3 Slip ring contacts 19 are shown, which transmit the electrical energy generated by means of the component 18 of the rolling device 3 from the contact 10 of the rolling device 3 to a battery (not shown).

[0234] Reference numerals 20 and 21 denote electric wires which transfer the electric current ( 20 ) from the rolling device to the battery ( 21 ).

[0235] Figure 4 Show according to Figure 2 The rolling device 3.

[0236] Reference numeral 22 denotes a fork, by means of which the rolling device 3 or the wheel 2 is fastened to the transport device 23 .

[0237] Reference numeral 24 designates an electrical current consumer (eg a mobile phone) which can be charged with the electrical current generated by the component 18 located in the region of the rolling device 3 .

[0238] Reference numerals list

[0239] 1 Rubber sleeve

[0240] 2 wheels

[0241] 3 Rolling device

[0242] 4. Driving components

[0243] 5 Shielding elements

[0244] 6 Metal Segments

[0245] 7 Driven element

[0246] 8 Stator winding

[0247] 9 Rim

[0248] 10 Contacts

[0249] 11 Axis of rotation

[0250] 12. Driving magnet

[0251] 13 N pole

[0252] 14 S pole

[0253] 15 Driven magnet

[0254] 16 N pole

[0255] 17 S pole

[0256] 18 Components

[0257] 19 Slip ring contact

[0258] 20 Wire

[0259] 21 Wire

[0260] 22 Fork

[0261] 23 Transport device

[0262] 24 Mobile

Claims

1. A transport device (23) which can be moved on the ground by means of at least one rolling device (3) for the purpose of transporting at least one object and / or person, and the transport device has a drive element (4) which can be rotated at least indirectly via the rolling device (3), It is characterized in that - the drive element (4) comprises at least two drive magnets (12), and - a driven element (7) is provided, which has at least two driven magnets (15), - wherein the number of the driving magnets (12) is different from the number of the driven magnets (15), and - at least one non-magnetic shielding element (5) is provided for changing the orientation of a magnetic field arranged between the drive element (4) and the driven element (7), and At least one stator winding (8) is arranged, in which the driven element (7) can rotate about an axis of rotation (11) in order to generate an electric current.

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

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

4. The transport device (23) according to any one of claims 1, 2 or 3, characterized in that The rolling device (3) surrounds the wheel (2).

5. The transport device (23) according to claim 1, characterized in that The driving magnet (12) and / or the driven magnet (15) are designed as permanent magnets.

6. The transport device (23) according to any one of claims 1 or 2, characterized in that The drive element (4) is designed in an annular shape and has a plurality of drive magnets (12) arranged side by side.

7. The transport device (23) according to claim 1, characterized in that The rotation speed of the driven element (7) exceeds the rotation speed of the drive element (4).

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

9. The transport device (23) according to claim 1, characterized in that The driven element (7) is arranged so as to be freely rotatable about an axis of rotation (11).

10. The transport device (23) according to claim 1, characterized in that The number of the driving magnets (12) exceeds the number of the driven magnets (15).

11. The transport device (23) according to claim 1, characterized in that The drive element (4) and / or the driven element (7) and / or the shielding element (5) and / or the stator winding (8) are arranged next to each other in a contactless manner.

12. The transport device (23) according to claim 1, characterized in that The rolling device (3) can be connected to the drive element (4).

13. The transport device (23) according to claim 1, characterized in that The current can be transferred from the stator winding (8) to a battery.

14. The transport device (23) according to claim 1, characterized in that The current can be delivered to the battery via a slip ring contact (19).

15. A method for generating electric current by means of a transport device (23) according to claim 1, characterized in that - moving the rolling device (3) on the ground, and - causing the drive element (4) to rotate at least indirectly via the rolling device (3), - wherein at least two drive magnets (12) are arranged in the drive element (4), and - the number of the driving magnets (12) is different from the number of the driven magnets (15), and - at least one non-magnetic shielding element (5) is provided in order to change the orientation of a magnetic field arranged between the drive element (4) and the driven element (7), and - wherein the driven element (7) is caused to rotate, and At least one stator winding (8) is arranged in which the driven element (7) is caused to rotate in order to generate an electric current.

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