Conductor arrangement for inductive power transmission, inductive power transmission device, and method for forming conductor arrangement for inductive power transmission

Abstract

To provide a conductor arrangement for inductive power transfer, an inductive power transfer device, and a method of forming the conductor arrangement for inductive power transfer, with reduced electromagnetic interactions within the conductor arrangement.SOLUTION: A conductor arrangement for inductive power transfer comprises at least three coils that are arranged along a longitudinal axis and that are formed of at least one conductor, and at least two winding heads that are arranged opposite to each other and in which conductor sections of each of the coils extend along the longitudinal axis. The conductor arrangement includes a magnetizable material as a part of a shielding assembly. The magnetizable material is arranged so as to cover upper portions and side faces of first to third coils and a lower portion of the third coil, and arranged between at least two conductor sections. The magnetizable material is formed as a predetermined projection. The projection protrudes with a length which is at least half of the length of the winding head.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a conductor arrangement for inductive power transmission (which may be referred to as a conductor configuration or a conductor array), an inductive power transmission device (which may be referred to as an inductive power transmission arrangement or an inductive power transmission system), and a method for forming a conductor arrangement for inductive power transmission, particularly a conductor arrangement for inductive power transmission with reduced electromagnetic interaction. More specifically, the present invention relates to an invention particularly in the field of inductive power transmission to vehicles. Such vehicles can be land vehicles such as road-going vehicles (e.g., automobiles, trucks, buses), or rail vehicles such as trains and trams.

Background Art

[0002] Conventionally, electric vehicles, particularly rail vehicles and / or road-going vehicles, operate using electrical energy transmitted by inductive power transmission, and can particularly obtain propulsion force. Such vehicles can include a traction system of the vehicle or a circuit configuration (circuit arrangement) that is part of a traction system, including a receiving device adapted to receive an alternating electromagnetic field and generate an alternating current by electromagnetic induction. Furthermore, such vehicles can include a rectifier adapted to convert alternating current to direct current. This direct current can be used for charging a traction battery or operating an electric machine. In the latter case, the direct current is converted to alternating current by an inverter.

[0003] Also, the transmission of inductive power is performed, for example, using two sets of three-phase windings. That is, the primary winding, which is the first set of windings, is installed on the ground and is powered by a Wayside Power Converter (hereinafter, may be simply referred to as WPC). On the other hand, the secondary winding, which is the second set of windings, is installed on the vehicle. For example, in the case of a road-going vehicle, it can be attached to the underside of a part of the bogies in a plurality of vehicles. Such a second set of windings or generally the secondary side is often referred to as a pick-up configuration or a receiver. And the first set of windings and the second set of windings respectively form a high-frequency transformer for transmitting electrical energy to the vehicle. This can be done whether the vehicle is in a static state where it is not moving or in a dynamic state where it is moving.

[0004] Also, the primary winding and the secondary winding respectively show a conductor arrangement formed by a plurality of coils. And each conductor arrangement, especially each coil, can be formed of an electrical conductor, for example a cable, also called a phase wire.

[0005] Since there is a large clearance between the primary winding and the secondary winding, the operating characteristics of the formed transformer are different from those of a conventional transformer with an air gap that can be ignored or with a small enclosed magnetic core. That is, when the air gap is large, the mutual inductive coupling becomes small and the inductance leakage becomes large.

[0006] Such inductance leakage usually acts as a series inductance with each coil of each conductor arrangement. Therefore, in order to transmit high power, for example, in order to compensate for the reactance of the inductor at an operating frequency of kHz, it is necessary to have an appropriate capacitance. On the secondary side of the high-frequency transformer, it is preferable that a combination of an inductance composed of a main inductance or a mutual inductance and / or an inductance leakage and a capacitance composed of a compensating capacitance forms a resonant circuit. When the impedance values of the inductance and the capacitance are selected so that the natural resonant frequency of the resonant circuit is equal to the operating frequency, complete impedance cancellation will occur. Such a resonant circuit is called "tuned", and examples of the respectively tuned circuits are disclosed, for example, in Patent Document 1 which is the applicant's previous patent application.

[0007] Moreover, when there are a plurality of coils in the conductor arrangement, each constituting a compensation capacitor, it is generally preferable that each coil forms a tuned resonant circuit. Specifically, it is preferable that these coils are adjusted to the same operating frequency, or more generally, are operable at a common operating point.

[0008] Therefore, first, due to the electromagnetic interaction between the coils, it may be difficult to achieve this, and the coils are usually arranged close to each other within the conductor arrangement. Such electromagnetic interaction is particularly related to the difference in inductance of the coils due to the magnetic fields of the coils affecting each other, and may result therefrom.

[0009] In addition, due to temperature changes and aging changes, the allowable value of the compensation capacitor may increase, and the resonant frequency of the resonant circuit formed by each coil may change. In particular, when the compensation capacitors of each circuit are different, it may have different effects on the resonant operation of each circuit, and the resonant circuit may become malfunctioning. As a result, the changed resonant frequency may not match the operating frequency or the resonant frequency of other circuits. Such a phenomenon is called detuning, which will deviate from the overall performance and power transmission ability of the inductive power transmission device (inductive power transmission system). In addition, the impedance on the secondary side reflected to the primary side of the transformer may become capacitive. As a result, the current will lead with respect to the voltage of the WPC. When this current leads, the soft switching state of the semiconductor switch will be lost, and the power loss will increase significantly, which is very undesirable. Moreover, under such operating conditions, there is a problem that the WPC overheats and turns off, preventing the necessary power supply.

Prior Art Documents

Patent Documents

[0010]

Patent Document 1

SUMMARY OF THE INVENTION

PROBLEM TO BE SOLVED BY THE INVENTION

[0011] Therefore, an object of the present invention is to improve the operability of the conductor arrangement on the primary side or the secondary side by the configuration of a predetermined conductor arrangement or the method of forming a predetermined conductor arrangement, and in particular to realize a desired resonance operation.

MEANS FOR SOLVING THE PROBLEM

[0012] That is, the object of the present invention is solved by the invention as the subject matter defined in the independent claims in the appended claims. In addition, the invention of the advantageous embodiments is defined in the dependent claims. Note that the features of the invention mentioned in the above introduction part of this specification can be individually or in any combination thereof, even if not mentioned, or when obvious from others as common technical knowledge, also provided in the currently disclosed solutions.

[0013] In addition, according to the basic concept of the present invention, a solution for restricting the undesirable electromagnetic interaction between the coils of the conductor arrangement is proposed, and the conductor arrangement is used for the transmission of induced power. In other words, the present invention enables at least partial electromagnetic decoupling of at least some of the coils. Therefore, the inductance of the coils can be maintained at a similar level. In this way, similar operating points and resonance frequencies of the circuit can be achieved.

[0014] In addition, the present inventors have confirmed that the above-mentioned detuning is particularly an adverse effect from the viewpoint of the electromagnetic interaction between the coils of the conductor arrangement. Specifically, when a certain coil causes relatively strong detuning, it may affect other coils due to electromagnetic interaction, and thereby the entire conductor arrangement may be further detuned. Although it is repetitive, according to the present invention, by restricting electromagnetic interaction, it is possible to restrict or even prevent the overall conductor arrangement from detuning further.

[0015] For example, electromagnetic decoupling can be achieved by inducing in a desired way, such as increasing the permeability around at least one coil to concentrate the electromagnetic field generated from that coil near the coil or to limit the influence on other coils. Also, for example, by creating closed magnetic field lines of limited length, the electromagnetic field, especially its magnetic flux, can be kept near the coil.

[0016] Alternatively, in order to reduce the permeability around the coil, for example, by providing a large air gap, the range in which the magnetic flux of the coil affects adjacent coils can be restricted. For example, it can be said that the magnetic flux of the coil is not easily transferred, or in other words, does not reach at all. Therefore, for example, it is preferable to locally increase the distance between a certain coil and other coils in at least one direction. According to some embodiments, this distance is preferably used to place magnetizable material objects in the resulting gap in order to achieve the above-described increase in permeability. In this way, by combining both advantages regarding the above permeability, undesirable interactions can be reliably prevented.

[0017] Here, the permeability referred to is the constant μ when the relationship between the magnetic field strength H and the magnetic flux density B is expressed by the relational expression B = μH, and it means the ability around the coil to support the formation and expansion of the magnetic field generated from adjacent coils.

[0018] By restricting the electromagnetic interaction between coils in this way, the risk of detuning is restricted, and generally it becomes easier to maintain the common operating point of all coils. In particular, when one coil is affected by aging deterioration or temperature change, it is possible to suppress the risk that any of the coils causes uncontrollable detuning.

[0019] Furthermore, it has been clarified that introducing the above countermeasures is particularly effective in the winding head which is the so-called head part of the winding. This is because the coils are close to each other in these winding heads. Also, the magnetic flux of the winding head may become, for example, about 3 to 5 times larger than that of the central part of the conductor arrangement (the part including the active section described later). That is, for example, by providing a known electromagnetic shield assembly in this region, the concentration of ferrite or other magnetizable materials becomes high in the winding head. Therefore, when providing the means of the present invention for electromagnetic decoupling of the coils in the region of the winding head, it is possible to particularly well achieve limiting detuning.

[0020] More specifically, a conductor arrangement for inductive power transmission has been proposed. For example, a conductor arrangement for inductive power transmission to land vehicles such as trains and road-going vehicles has been proposed. The conductor arrangement is preferably formed of at least one conductor, for example, arranged adjacent to each other along the longitudinal axis, and more preferably each coil is formed of one individual conductor. Therefore, it is preferable to include at least three coils. Regarding the conductor arrangement, it preferably consists of at least two winding heads arranged opposite to each other, and the conductor sections of the respective coils extend along the longitudinal direction. Here, in two or at least one of the respective winding heads, the conductor sections of the first coil (hereinafter sometimes referred to as the outer coil) and the second coil (hereinafter sometimes referred to as the outer coil) extending along the longitudinal axis are arranged at a predetermined distance (the first distance) from each other. Therefore, the first distance is equal to or greater than zero. Accordingly, the conductor section of the third coil (hereinafter may be referred to as the central coil) extending along the longitudinal axis is arranged at a second distance with respect to a further conductor section, i.e., with respect to the conductor sections of the first and second coils extending along the longitudinal axis. Such second distance is greater than the first distance.

[0021] Alternatively, in other words, it is preferable that the conductor sections of the first and second coils are arranged closer to each other than the conductor section of the third coil. The second distances may be equal to each other and generally differ from zero. Hereinafter, when referring to only one second distance in the singular form, and unless otherwise specified or mentioned, this may relate to both second distances. Alternatively, instead of defining two second distances, a second distance related to the distance between the first coil and the third coil and a third distance related to the distance between the second coil and the third coil can be defined, and these distances are again greater than the first distance.

[0022] Alternatively, in other words, it is preferable that the two conductor sections (the conductor sections of the first and second coils) are arranged close to each other or at the same position along the defined axis, i.e., at the first distance. On the other hand, the further conductor section of the third coil is arranged at a distance greater than the first distance. It should be noted that the distance of the further conductor section with respect to either of the conductor sections of the first and second coils is preferably greater than the first distance.

[0023] Therefore, the second distance is preferably at least 1.5 times, or at least 2 times, at least 5 times, at least 10 times, or at most 20 times the first distance. Furthermore, or alternatively, the first distance is preferably less than 10%, less than 5%, or less than 2% of the length of the longitudinal section of the coil within the winding head, and the second distance is preferably greater than that. For example, it is 1.5 times the first distance.

[0024] Generally, the first distance and the second distance are preferably selected such that equivalent characteristics of the coil are achieved, for example, by appropriately restricting unwanted interactions. Such characteristics include inductance, resonance behavior, amplitude and / or frequency of the induced current, etc. In the context of this specification, a coil with a large distance from the remaining coils may be, for example, a coil that is exposed to the most and / or maximum interaction with other coils by being disposed therebetween (see the following description).

[0025] In the disclosure of this specification, when referring to the conductor section of the coil, particularly the conductor section of the coil within the winding head, even if not specifically mentioned in each of the following cases, this may generally relate to the conductor section extending along the longitudinal axis. Therefore, when referring to the conductor section within the following winding head, the lateral conductor sections included in the winding head or that may be at least connected to the winding head may not be considered.

[0026] Furthermore, the extension of such a conductor section along the longitudinal axis is not limited to a straight parallel extension with respect to the longitudinal axis. That is, it can be arbitrary. Rather, the conductor section can be considered to extend along the longitudinal axis as long as one, for example, the dominant vector direction component of its extension extends along the longitudinal axis. This relates to, for example, elliptical coils or generally curved extensions of the conductor sections within the winding head. Thus, a conductor section can be considered to extend along the longitudinal axis only if it does not extend, or extends to a lesser or dominant extent, along a transverse axis extending perpendicular to the longitudinal axis. Similarly, any conductor section can be considered to extend along the longitudinal axis when connecting two conductor sections spaced apart from each other along the longitudinal axis and / or two regions of a coil. Such a configuration may be effective regardless of the exact course or extension of the conductor section extending between the connected sections or regions.

[0027] A winding head generally refers to a region where the extending direction of the coil is reversed when viewed from the winding direction. For example, a conductor may enter the winding head upward and exit the winding head downward toward the opposite winding head.

[0028] Also, a coil may also be called a phase winding or a pole of a conductor arrangement. Generally, a coil is composed of at least one completely or mostly closed loop or winding formed by a conductor. For example, the opening angle of the loop or coil is preferably equal to or less than 90°, and thus is mostly closed. The coil is preferably composed of a plurality of completely or mostly closed turns (windings), for example, at least two turns per coil. The opening angles or sections of such turns are preferably arranged so as not to overlap each other, for example, by being arranged on different, preferably opposite sides of the coil.

[0029] Also, the coil is preferably formed by a conductor. Preferably, at least some, preferably all, of the coils are formed by individual conductors, i.e., one conductor per coil. Such a conductor may also be referred to as a phase line in a three-phase structure or as a cable. Generally, each coil preferably generates one phase of a three-phase alternating current on the secondary side or is operated by one phase of a three-phase alternating current on the primary side.

[0030] Regarding the conductor arrangement, it is preferable to have a longitudinal axis and, preferably, a transverse axis that extends obliquely, for example orthogonally, with respect to the longitudinal axis. Both axes preferably extend within or parallel to the plane in which at least one of the plurality of coils is formed. Note that the "plane in which the coil is formed" preferably relates to any main plane in which the coil is formed, or a plane including at least 50% of, for example, the region covered or surrounded by the coil as a main plane, and / or a plane including at least 50% of the conductor length of the coil. Furthermore, or alternatively, the above expression preferably relates to the plane of the coil extending between the winding heads and / or the plane including the active section of the coil, as will be described in more detail below.

[0031] Also, the coils are preferably arranged adjacent to each other along the longitudinal axis, for example, when viewed along the longitudinal axis of the conductor arrangement. However, depending on the conditions, it may also be preferable to have a displaced arrangement along the longitudinal axis. This includes the presence of a distance, pitch, or space between at least some of the coils. However, preferably, the coils at least partially overlap each other, and partial overlap is also included as long as the order of the coils is clear when viewed along the longitudinal axis, even if they are arranged adjacent to each other along the longitudinal axis. Preferably, there is no displacement of each coil along the transverse axis.

[0032] Generally, the centers of the coils, for example, the geometric center and / or the center of the area surrounded by the coils, are preferably arranged adjacent to each other along the longitudinal axis, but it is more preferable that there is a distance therebetween. Such a distance can be at least one quarter of the dimension of at least one of two adjacent coils along the longitudinal direction, for example, about half or one third of such a dimension. Furthermore, it is preferable that each center coincides with the longitudinal axis or is arranged along a common straight line extending along the longitudinal axis.

[0033] Each coil is preferably rectangular or elliptical in shape, and it is more preferable that each coil has the same dimensions and shape. Each coil preferably has two sets of sections arranged opposite and / or parallel to each other, one pair being part of the winding head and the other pair being the so-called active section. Furthermore, or alternatively, each coil preferably has two relatively long sections and two relatively short sections, and such long sections preferably extend opposite and / or parallel to each other, and the same preferably applies to the short sections. The long part is preferably the active section, and the short part is preferably part of the winding head.

[0034] The active section of the coil can define or govern the characteristics of the coil regarding the transmission of induced power. In addition, or as an alternative, the active section is preferably configured to generate a resonant electromagnetic field by interacting (and / or cooperating) with a further conductor arrangement arranged on the other side of each of the primary and secondary sides, for example, during the transmission of induced power. Generally, such an active section is preferably formed by or forms at least a part of the long section of the coil and / or the so-called pole legs of the coil. Further, such an active section preferably extends along the transverse axis of the conductor arrangement and is preferably connected by a further short winding head section extending along the longitudinal axis (vertical axis) of the conductor arrangement.

[0035] That is, each coil preferably has sections or segments extending along or parallel to the longitudinal and transverse axes, and in particular preferably has two sections along the longitudinal direction and two sections along the transverse direction. The section extending parallel to the transverse axis is also called the active section. The transverse axis preferably extends orthogonally to the longitudinal axis and preferably crosses the longitudinal axis.

[0036] The coil is preferably formed as a substantially flat structure. Therefore, these coils are preferably arranged within and / or parallel to a common two-dimensional plane. Such a plane is preferably composed of the above-mentioned transverse and longitudinal axes (vertical axes) of the conductor arrangement. It should be understood that when extending within a common plane, the plane can have a limited thickness defined, for example, by the thickness of the conductor (e.g., its diameter). On the other hand, at the position of overlap, lamination, and intersection between at least two coils, the thickness of the plane is preferably defined by the thickness of the conductor or multiples of their respective diameters. For example, at each intersection, a plurality of conductor sections are arranged overlapping each other.

[0037] According to known solutions, at least a part of the conductor section of the coil forming the winding head is preferably arranged at a different location, for example, at a different vertical height, from the conductor section forming the active part of the coil. For example, these different conductor sections are preferably angled relative to each other. In this case, the plane in which the coil is formed preferably has a thickness such as to constitute both height levels and, as described above, extends between the winding heads and is thus preferably related to the main plane that constitutes the active section.

[0038] Generally, both the horizontal axis (lateral axis) and the vertical axis (longitudinal axis) can be oriented perpendicular to the vertical axis (vertical spatial axis). Such a vertical axis preferably extends towards the other of the first and second sides and / or is parallel to the main direction of power transmission. Also, the vertical axis may be oriented along the direction of gravity, but preferably it is oriented oppositely thereto. The terms related to directions used in this disclosure that refer to directions such as "up", "down", "sideways" or their respective equivalents can be used in relation to the aforementioned vertical axis, horizontal axis, and longitudinal axis.

[0039] References to the first coil, second coil, and third coil are generally interchangeable unless otherwise specified or otherwise apparent. That is, the terms first, second, and third do not define a definite order. Furthermore, in a preferred embodiment, one of the coils is arranged between the other coils along the longitudinal axis, i.e., it is the third coil that is arranged at a greater distance from the other coils.

[0040] More precisely, according to one embodiment of the arrangement and method of the present invention, the third coil is preferably at least partially arranged between the first coil and the second coil when viewed along the longitudinal axis. This is beneficial in that the central coil is most likely to be most affected by the electromagnetic interaction with the outer coils. Therefore, the overall electromagnetic interaction within the conductor arrangement can be significantly reduced, and it is particularly advantageous to isolate the central coil from the outer coils using the means of the present invention.

[0041] Generally, the first distance and the second distance are preferably measured along any common axis, and according to the following embodiments, they can be measured particularly along a vertical axis or a horizontal axis, for example, a lateral axis.

[0042] Specifically, according to one aspect of the conductor arrangement and the method of forming the conductor arrangement of the present invention, the first distance and the second distance preferably extend along an axis parallel to the plane in which at least one of the plurality of coils is formed. Such a plane is preferably the main plane as described above. Also, such a plane is preferably a horizontal plane extending orthogonally to a predetermined vertical axis (spatial axis). On the other hand, the axis along which the distance is measured is preferably the lateral axis as described above. By configuring in this way, the horizontal displacement of the coil can be provided.

[0043] Therefore, along a predetermined axis, in the winding head, it is preferable to arrange two coils or their conductor sections respectively, preferably at the same position, for example, at the same lateral position. On the other hand, it is preferable to arrange the conductor section of the third coil at a different lateral position compared to the other conductor sections. In particular, the different lateral positions can be arranged closer to the inside and / or closer to the geometric center with respect to the geometric center of the conductor arrangement.

[0044] Therefore, for example, it is preferable that the conductor sections of the first coil and the second coil respectively form the outer sections of the winding head, and the conductor section of the third coil forms the inner conductor section. Such an inner conductor section preferably faces, for example, the opposite winding head, and conversely, is preferably located closer than the outer section.

[0045] In this regard, the third coil preferably has a reduced lateral dimension, or in other words, a reduced height, compared to the first and second coils. And such a lateral dimension preferably extends between the winding heads. Specifically, the lateral dimension is preferably measured along the above-described lateral axis that extends perpendicular to the longitudinal axis. Considering the practical dimensions of the coil, this may not have a significant impact on the characteristics of the coil, such as the induced current. However, in order to compensate for this limited dimension, it is also possible to appropriately adjust other measured values and characteristics of the third coil. For this purpose, in the conductor of the third coil, for example, its diameter and / or the longitudinal dimension along the longitudinal axis are adjusted, and it is particularly preferable to increase them.

[0046] Alternatively, the first distance and the second distance preferably extend along an axis that is non-parallel to the plane in which at least one of the plurality of coils is formed. In particular, the first distance and the second distance preferably extend along a vertical axis. Thus, for example, the conductor sections of the first to third coils are preferably arranged one above the other within the winding head, or in other words, preferably arranged one above the other. However, they are preferably separated from each other by different distances. In particular, two coils (the first coil and the second coil) are preferably arranged close to each other, while the remaining third coil is preferably arranged at a second distance that is greater than that. By doing so, the electromagnetic interaction between this third coil and either the first coil or the second coil can be restricted.

[0047] As described above, the first distance and the second distance are generally vertical distances, that is, preferably measured along the vertical axis.

[0048] Furthermore, according to a further embodiment of the conductor arrangement and the method of forming the conductor arrangement of the present invention, within each winding head, it is preferable that a magnetizable material is disposed between the conductor section of the third coil and the conductor section of one of the first and second coils. Specifically, it is preferable that the magnetizable material is disposed between the third coil and one adjacent to each of the first and second coils. For this purpose, it is particularly effective to increase the distance of the third coil from the remaining coils. More specifically, as part of a shield door assembly extending along the winding head (W), having a magnetizable material, when the third coil is disposed on the lower side, the magnetizable material is disposed to cover the upper and side surfaces of the first to third coils and the lower portion of the third coil, and within at least one of the winding heads (W), when viewed along an axis non-parallel to the plane in which at least one of the first to third coils is formed, it is disposed between at least two conductor sections, and the magnetizable material extends at least partially parallel to the plane in which at least one of the first to third coils is formed and is formed as a protrusion protruding along the lateral axis, and the protrusion protrudes with a length of at least half of the length of the winding head.

[0049] Generally, since the magnetizable material is not completely permeable to magnetic flux, the electromagnetic field, more precisely the magnetic flux of adjacent coils, can be induced in a desired manner. Instead, the magnetic flux may be at least partially directed in the direction of the magnetizable material. Therefore, such a magnetizable material helps to concentrate the magnetic flux near each coil, and as a result, adjacent coils can be magnetically shielded from each other. Preferably, it is performed in such a way that closed or short magnetic field lines are formed. Also, the magnetizable material can avoid or at least limit the intersection of the magnetic fields of adjacent coils by appropriately guiding the magnetic flux and in particular the magnetic field lines of each electromagnetic field.

[0050] In one example of the conductor arrangement and the method of forming the conductor arrangement of the present invention, the magnetizable material is preferably arranged so as to promote the formation of closed magnetic field lines around the third coil. Furthermore, or alternatively, it is preferable to arrange the magnetizable material so as to promote the formation of closed magnetic field lines of the first coil and / or the second coil. For this purpose, the magnetizable material preferably forms a protrusion extending between the third coil and at least one of the first coil and the second coil. Such a protrusion preferably protrudes along a lateral axis and preferably extends along a longitudinal axis for a defined length, for example at least half the length of the winding head. Generally, the magnetizable material surrounds the third coil and / or at least one, or preferably both, of the first coil and the second coil within the winding head on at least two sides, preferably three sides.

[0051] Generally, the magnetizable material preferably has low conductivity, for example, is ferrite. As a result, the influence of the current induced in the shielding material is reduced.

[0052] More generally, the magnetizable material is preferably ferromagnetic, paramagnetic or ferrimagnetic. Such a magnetizable material preferably has a magnetic susceptibility of at least 10, more preferably at least 50.

[0053] In a further embodiment of the conductor arrangement and the method of forming the conductor arrangement of the present invention, when viewed along an axis non-parallel to the plane in which at least one of the plurality of coils is formed, the magnetizable material is preferably arranged between the respective conductor sections.

[0054] As described above, according to an embodiment of the conductor arrangement and the method of forming the conductor arrangement of the present invention, the magnetizable material is formed as a protrusion. Such protrusions preferably extend at least partially parallel to the plane in which at least one of the coils is formed, and more specifically, preferably protrude in a certain direction. For example, such protrusions preferably project horizontally into the space formed between the third coil and at least one of the first and second coils.

[0055] According to one aspect of the conductor arrangement and the method of forming the conductor arrangement of the present invention, the magnetizable material is preferably part of a shield door assembly extending along each winding head. Such a shield door assembly is generally preferably configured to shield the surroundings from the electromagnetic field generated by the conductor arrangement. Examples of each shield door assembly can be found, for example, in the publication EP2841293 B1 of the applicant's previous disclosure. The magnetizable material extending between the conductor sections can be directly arranged and / or formed as part of the shield door assembly, so this aspect is beneficial in terms of cost. Therefore, no additional carrier members of the fixture are required to arrange the magnetizable material in the desired manner.

[0056] In order to further reduce the manufacturing cost, it may be preferable to provide an integrated design in which the magnetizable material, such as protrusions, arranged between the conductor sections in the above-described manner forms a larger part of the shield door assembly. For example, such protrusions preferably project from an elongated shield member extending longitudinally along, for example, the winding head. Such an elongated shield member preferably has at least one cross-section of C-shaped, U-shaped, or L-shaped so as to cover the outside and / or upper part and the side surface of the conductor arrangement, separately from the material arranged between the conductor sections.

[0057] Also, in each winding head, it is preferable to arrange the magnetizable material on the surface of the conductor section of the third winding on the side opposite to the first and second windings. Also, within each winding head, it is preferable to cover or shield, with respective magnetizable materials, the side facing the outside of the conductor section of the third winding, particularly the other of the primary side or the secondary side. Also, with respect to the vertical axis, it is preferable that the magnetizable material is disposed below the conductor section of the third winding. Furthermore, it is preferable that each magnetizable material is disposed above the first and / or second coil in the vertical direction. These materials above and below the coil are preferably connected to each other by further portions of the magnetizable material, thereby forming an overall C profile.

[0058] This can preferably be done by horizontal protrusions of such materials, which preferably extend parallel to the respective materials when each material is also disposed between the conductor sections in the above-described manner. Each material preferably forms the horizontal leg of the cross-sectional profile of the shield assembly, for example, the lower leg of the C profile or E profile of each outer shape. The E profile may be achieved when a magnetizable material is provided between the conductor sections in the above-described manner, in which case the magnetizable material forms the intermediate leg or intermediate protrusion of the E profile. As some general aspects, the shield assembly preferably has an E cross-sectional profile.

[0059] Any of the profiles described herein is preferably the cross-sectional profile of the shield assembly. The plane of such a cross-section preferably extends orthogonally to the conductor section within the winding head and / or preferably extends orthogonally to the horizontal spatial plane.

[0060] Furthermore, the present invention relates to a conductor arrangement including at least three coils arranged along a longitudinal axis and formed of at least one conductor. Such a conductor arrangement includes at least two winding heads that are arranged opposite each other, and the conductor sections of each coil not only extend along the longitudinal axis but also along each other, and a magnetizable material object is arranged between at least two conductor sections inside at least one winding head.

[0061] The conductor arrangement of the present invention preferably includes any of the features, embodiments, and aspects discussed above or below regarding the conductor arrangement consisting of the first and second distances. Specifically, the definitions, explanations, embodiments, and modifications described above regarding similarly named features are preferably also applicable to this conductor arrangement consisting of a magnetizable material object.

[0062] More specifically, it is preferable to arrange a magnetizable material between the conductor section of the third coil described above, for example, a coil arranged between a plurality of coils along the longitudinal direction, and one of the first coil and the second coil. Moreover, the magnetizable material object is preferably formed as, for example, a horizontal protrusion. However, the difference is that, contrary to the conductor arrangement consisting of the first and second distances, such an unequal spacing of the conductor sections within the winding head is not essential. On the contrary, even when the spacing between the conductor sections is equal or generally different, it has been determined that when a magnetizable material object is arranged between at least two conductor sections (for example, between vertical directions), especially between segments extending along the longitudinal axis, the advantages of the present invention are at least partially achieved.

[0063] The present invention further relates to an inductive power transmission device comprising a primary side configured to generate an electromagnetic field and a secondary side configured to receive the electromagnetic field, thereby generating magnetic induction on the secondary side, wherein at least one of the primary side and the secondary side comprises a predetermined conductor arrangement. The primary side and the secondary side are preferably generally configured according to any of the examples described above and below. For example, it is preferable that the primary side is stationary and, for example, provided around the periphery, while the secondary side is movable and, for example, mounted on a vehicle. As a general aspect of the present invention, the conductor arrangements disclosed herein can be used on either the primary side or the secondary side. On the other hand, restricting the electromagnetic interaction between the coils is particularly beneficial on the secondary side.

[0064] In summary, it is preferable to arrange the secondary side mounted on a land vehicle, and the primary side around the land vehicle, for example, on the ground where the land vehicle moves.

[0065] Furthermore, the present invention relates to a method for forming a conductor arrangement for inductive power transfer. In this forming method, it is preferable to form at least three coils of the conductor arrangement such that the coils are arranged along the longitudinal axis. And it is preferable that at least two winding heads are formed which are arranged opposite to each other and the conductor sections of each coil not only extend along the longitudinal direction but also extend along each other. And in at least one of the two winding heads, the conductor sections of the first coil and the second coil extending along the longitudinal axis are preferably arranged at a first distance from each other. Furthermore, the first distance is equal to or greater than zero, and the conductor section of the third coil extending along the longitudinal axis is arranged at a second distance from a further conductor section, that is, the conductor sections of the first coil and the second coil, and the second distance is preferably made greater than the first distance.

[0066] Furthermore, the present invention relates to a method for forming a further conductor arrangement for inductive power transfer. In this forming method, it is preferable to form at least three coils of the conductor arrangement such that the coils are arranged along the longitudinal axis. And it is preferable that at least two winding heads are formed which are arranged to face each other, and the conductor sections of each coil not only extend along the longitudinal direction but also extend along each other. And it is preferable that a magnetizable material is arranged between at least two conductor sections extending, for example, along the longitudinal axis within at least one winding head.

[0067] According to the method of forming the conductor arrangement of the present invention, it preferably includes any further steps, any developments, or any further features in order to provide any of the interactions, operating states, and functions described previously and subsequently. Specifically, it is preferable that any of the previous and subsequent descriptions and developments regarding the features of the conductor arrangement also apply to the features of equivalent methods. And generally, the method of forming the conductor arrangement is preferably realized and / or implemented with the conductor arrangement according to any of the previous and subsequent embodiments.

Brief Description of the Drawings

[0068]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0069] Hereinafter, an embodiment of the present invention will be described with reference to the attached schematic diagrams. Features corresponding to each other with respect to their types and / or functions can be assigned the same reference numerals throughout the figures.

[0070] FIG. 1 schematically shows an inductive power transmission device 100 according to an embodiment of the present invention. Such an inductive power transmission device 100 is configured to inductively charge an electric vehicle or the like as the vehicle 4. Further, the vehicle 4 preferably includes wheels 7a and 7b for traveling on a track 2 such as a road or a rail track. For example, such a vehicle 4 is preferably a land vehicle such as a passenger car or a bus for traveling on a road surface, and is also preferably a vehicle on a track such as a railway vehicle. Note that in FIG. 1, details of the road or the railway are not shown and are appropriately omitted.

[0071] Further, an arrangement pattern of, for example, an embedded conductive material combined with the track 2 is also preferable. For example, during operation, there are phase conductors 1a, 1b, and 1c for carrying three phases of a three-phase alternating current. Such phase conductors 1a, 1b, and 1c form a conductor arrangement 90 for inductive power transmission, each of which is an outer coil 92 (hereinafter, may be referred to as a first coil or a second coil) and a central coil 94 (hereinafter, may be referred to as a third coil) (see the description of FIG. 2 below).

[0072] Together with the arrangement pattern of the conductive material embedded in the track 2 or being a part of the track 2, the conductor arrangement 90 forms the primary side 102 of the inductive power transmission device 100, or in other words, forms a primary side conductor assembly. During operation, the primary side 102 generates an electromagnetic field. The magnetic force lines F (hereinafter, may be referred to as magnetic flux lines) are schematically shown in FIG. 1. However, the magnetic force lines F are not shown completely. Rather, only a substantially homogeneous region of the magnetic field in the gap between the primary side 102 and the secondary side 104 of the inductive power transmission device 100 mounted on the vehicle 4 is illustrated by the magnetic flux lines.

[0073] Vehicle 4 includes a receiver 4b for receiving an electromagnetic field and generating electrical energy by magnetic induction. For this purpose, the receiver 4b is the secondary side 104 of the inductive power transmission device 100, in other words, it constitutes the secondary side conductor assembly. In the illustrated specific embodiment, it is preferable that this secondary side 104 consists of three phase lines 5a, 5b, 5c for generating a three-phase alternating current. That is, these phase lines 5a, 5b, 5c are preferably coils consisting of a plurality of windings of an elongated electrical conductor, and thus represent the outer coil 92 and the central coil 94 of the conductor arrangement 90 described above. Optionally, these phase lines 5a, 5b, 5c are preferably composed of a plurality of coils, and more precisely, are preferably formed by a plurality of coils.

[0074] Also, in FIG. 1, an energy storage device 4a for storing the electrical energy generated by the receiver 4b is schematically shown. Such generated electrical energy can be used to supply any electrical consumer, but other electrical and / or electronic components mounted on the vehicle 4 are not shown in FIG. 1 and are appropriately omitted.

[0075] FIG. 2 schematically shows either a plan view seen from above or a bottom view seen from below of the primary side 102 or the secondary side 104 of the inductive power transmission device 100 in FIG. 1. In particular, it shows a plan view seen from above or a bottom view seen from below of the conductor arrangement 90 on each of the primary side 102 or the secondary side 104. The direction connecting the primary side and the secondary side, that is, the direction of the magnetic field lines F extending therebetween as shown in FIG. 1, preferably extends perpendicular to the image plane of FIG. 2. Also, in FIG. 1, the phase lines 5c, 5a and the phase conductors 1c, 1a as the outer members of each conductor arrangement 90 correspond to the outer coil 92 in FIG. 2, while the phase line 5b and the phase conductor 1b as the central members correspond to the central coil 94 in FIG. 2.

[0076] In FIG. 2, the longitudinal axis LO is shown. Such a longitudinal axis LO preferably extends, for example, parallel to the track 2 from left to right in FIG. 1. Also, a lateral axis LA extending orthogonally to the longitudinal axis LO is shown. In FIG. 1, the lateral axis LA extends orthogonally to the plane of this figure, for example, toward the observer. The lateral axis LA and the longitudinal axis LO extend in or define a horizontal plane. Note that the horizontal plane corresponds to the plane in which at least the active section A of the outer coil 92 and the central coil 94 is formed. As described above, it is preferable to consider this as the main plane in which the outer coil 92 and the central coil 94 are formed. Furthermore, the vertical spatial axis Z extends orthogonally to both the lateral axis LA and the longitudinal axis LO and faces the observer in FIG. 2. Note that the direction of the vertical spatial axis Z is also depicted in FIG. 1.

[0077] Also, the outer coil 92 and the central coil 94 are each shown by distinct lines. Specifically, the outer coil 92 is shown by a dotted line and a dashed line, while the central coil 94 is shown by a continuous line. Each coil is formed as an elliptical or rectangular closed electrical conductor arrangement, and it can be seen that this conductor is a cable. The outer coil 92 and the central coil 94 preferably have the same shape and size but are not arranged in coincidence. Instead, they are preferably shifted relative to each other along the longitudinal axis LO but are arranged at the same height along the lateral axis LA.

[0078] The outer coil 92 and the central coil 94 each consist of two long conductor sections extending along the lateral axis LA and two short conductor sections extending along the longitudinal axis LO. Each pair of the respective conductor sections is preferably parallel to each other and located on opposite sides of each other. The conductor sections extending along the lateral axis LA form the active section A of each of the outer coil 92 and the central coil 94, and thus form the active section A of the overall conductor arrangement. The conductor sections extending along the longitudinal axis LO form two opposing winding heads W that connect the active section A. Specifically, the active sections A are spaced apart from each other along the longitudinal axis LO. However, they are connected by the conductor sections of the winding heads. To fill the longitudinal gap between the active sections A, the conductor sections of the winding heads extend along the longitudinal axis LO, even if they are curved in the case of an elliptical winding. For the sake of explanation, in FIG. 2, a relatively large area of the winding head W is surrounded. However, strictly speaking, only the area where the short conductor sections of each of the three outer coils 92 and the central coil 94 extend along each other is considered to represent the actual winding head W. This corresponds to the area of the short longitudinal conductor section of the central coil 94 in each of the surrounded areas. Note that only the conductor sections extending along the longitudinal axis LO are referred to as "conductor sections within / of the winding head" etc. in the context of the embodiment.

[0079] Therefore, in the example of FIG. 2, the outer coil 92 and the central coil 94 are arranged at the same position, i.e., the same height, along the lateral axis LA. However, they are arranged sequentially, particularly adjacent to each other, along the longitudinal axis LO.

[0080] More specifically, for each of the outer coil 92 and the central coil 94, geometric centers 92M, 94M are shown, that is to say, the centers of the circular equivalent areas of the outer coil 92 and the central coil 94, namely, the centers of the regions surrounded by the outer coil 92 and the central coil 94 are shown. It can be seen that such a central coil 94 is arranged between the outer coils 92 along the longitudinal axis LO, particularly with respect to its geometric center 94M, especially between the geometric centers 92M of these outer coils 92.

[0081] Therefore, the outer coil 92 and the central coil 94, particularly their geometric centers 92M, 94M, are arranged at intervals from each other, that is to say, preferably displaced relative to each other by an equal distance along the longitudinal axis LO, for example, one-third of the longitudinal dimension, that is, the width, of each outer coil 92 and the central coil 94.

[0082] As a general result of the conductor arrangement depicted in FIG. 2, each outer coil 92 and the central coil 94 preferably form coils that can generate different phases of a three-phase alternating current or carry one phase of a three-phase alternating current during operation, depending on whether the primary side 102 or the secondary side 104 is considered.

[0083] Furthermore, FIG. 2 shows a shield assembly 96 made of a magnetic material as a magnetizable material object. As will be apparent from the following figures, such a shield assembly 96 preferably covers at least a part of the winding head W or extends below it with respect to the vertical spatial axis Z. Also, although the shield assembly 96 is only depicted as extending outside and along the winding head W, it preferably surrounds the conductor arrangement 90 entirely. For example, by connecting the longitudinal section depicted in FIG. 2 with additional transverse sections (not shown), it preferably has a generally rectangular outer shape. Furthermore, at least a part of the shield assembly 96 preferably extends along the side surface of the conductor arrangement 90 facing away from the further conductor arrangement 90 on each respective other side of the primary side 102 or the secondary side 104. An example of the shield assembly 96 can be found in the above-mentioned prior disclosure in EP2841293 B1.

[0084] Hereinafter, a cross-section through the conductor arrangement 90 according to an embodiment of the invention will be described. The plane of such a cross-section includes the lateral axis LA and the vertical spatial axis Z, or extends parallel to the lateral axis LA. Also, although only one of the winding heads W is depicted in the cross-section, it should be understood that the winding heads W on the opposite sides are similarly configured. This is indicated by the symmetry axis S about which the depicted members and components are mirrored in the following figures. Furthermore, the following cross-sectional views relate to the secondary side 104, but for example, the primary side 102 can be configured in the same way by simply turning the depicted conductor arrangement 90 upside down.

[0085] However, first, an example of a prior art solution is shown in FIG. 3. More precisely, a cross-section of the winding head W of the prior art conductor arrangement 90 is shown. The outer coils 92 and the central coil 94 in different embodiments are represented by the same line types (i.e., dotted lines, dashed lines, solid lines) as in the case of FIG. 2. A part of the active section A of these outer coils 92 and the central coil 94 can be seen. In the region of the winding head W, the conductor sections of the outer coils 92 and the central coil 94 are angled with respect to the active section A and extend in the plane of FIG. 3 towards the opposite active section A, i.e., facing away from the observer.

[0086] In a generally known method, the conductor sections of each outer coil 92 and the central coil 94 are arranged perpendicular to each other, or in other words, vertically stacked along a predetermined axis (refer to each vertical spatial axis Z). For this reason, adjacent conductor sections inside the winding head W are arranged at intervals in a direction perpendicular to each other. This interval is regular, that is, the conductor sections have the same perpendicular distance with respect to each directly adjacent conductor section. Also, the distance is relatively small, for example, on the order of several centimeters, and does not exist when adjacent conductor sections come into contact. When contact is not desired, an electrically insulating material spacer such as plastic can be arranged between adjacent conductor sections.

[0087] Furthermore, it is shown to include a shield door assembly 96 including a magnetizable material object 110. Such a shield door assembly 96 covers the upper side in the vertical direction of the conductor arrangement 90 and has a predetermined region 112 with an enlarged angle for receiving the winding head W near the side edge. Note that the shield door assembly 96 also covers the lateral outer edge of the winding head W, in other words, the lateral surface 114.

[0088] Also, FIG. 3 shows the main course of the magnetic field lines 116 generated in the region of the winding head W, and such magnetic field lines 116 are generated when operating the conductor arrangement 90, that is, when inductively transmitting electrical energy thereto. Due to the shape of the shield door assembly 96, most of the generated electromagnetic flux does not enter the surroundings and follows the shape of the shield door assembly 96. Specifically, after leaving the winding head W vertically upward, the magnetic field lines 116 are guided toward the lower part of the winding head W through this part of the shield door assembly 96 that covers the lateral surface 114 of the winding head W. In this way, a closed circle of the magnetic field lines 116 is generated.

[0089] However, the inventors have observed that these magnetic field lines 116 extend through all the conductor sections present in the winding head W, and thus extend through all the outer coils 92 and the central coil 94. As a result, although these outer coil 92 and central coil 94 are actually supposed to generate independent alternating current phases, the electromagnetic interaction between the outer coil 92 and the central coil 94 becomes stronger. In particular, since the central coil 94 is disposed between the outer coils 92, it has already experienced a strong electromagnetic interaction in the region of its active section A.

[0090] The present invention attempts to overcome these problems by electromagnetically isolating at least a part of the outer coil 92 and the central coil 94. For example, according to the following embodiments, at least a part of the outer coil 92 and the central coil 94 can be electromagnetically isolated.

[0091] That is, in FIG. 4, a cross section similar to that in FIG. 3 is shown. In this case, only the conductor sections of the outer coil 92 are arranged close to each other inside the winding head W. Specifically, they are arranged at a relatively small first distance D1 from each other, which is preferably several cm (for example, 5 cm or less), and preferably zero. On the other hand, the conductor sections of the central coil 94 are arranged at a larger second distance D2 from each conductor section of the outer coil 92 inside the winding head W. Although the second distances D2 are of course different from each other, similar labels are attached to indicate their relationship with the distances between the conductor sections of the central coil and other conductor sections. Furthermore, the first distance D1 and the second distance D2 are vertical distances as is clear from the coordinate system in FIG. 3, and this is also valid for each of FIGS. 4 to 6.

[0092] Therefore, inside the winding head W, the conductor sections of the outer coil 92 are arranged closer to each other (first distance D1) than to the conductor sections of the central coil 94 (second distance D2). The air gap formed between the outer coil 92 and the central coil 94 can limit the electromagnetic interaction between these outer coil 92 and central coil 94, particularly the undesirable influence of the outer coil 92 on the central coil 94.

[0093] Therefore, as depicted in FIG. 3, adjusting the distance between the outer coil 92 and the central coil 94 represents such an embodiment of the present invention, regardless of the further features of the shield assembly 96 described hereinafter.

[0094] Nevertheless, a further advantageous embodiment is formed by the illustrated design of the shield assembly 96, particularly by the portion of the magnetizable material 110 that extends between the conductor sections of the winding head W.

[0095] More specifically, FIG. 3 shows that the shield assembly 96 again has a portion that covers the lateral face 114 of the conductor section inside the winding head W. At the position between the conductor section of the outer coil 92 and the conductor section of the central coil 94, there are formed protrusions of the magnetizable material 110 that project horizontally, i.e., along the lateral axis LA (see FIG. 3), and along the length of the winding head W, i.e., along the longitudinal axis LO (see FIG. 3). Therefore, such protrusions of the magnetizable material 110 preferably extend into the air gap formed by the increased second distance D2 between the outer coil 92 and the central coil 94 in this way. That is, when viewed along the vertical spatial axis Z, such protrusions of the magnetizable material 110 are preferably arranged between the conductor sections of the outer coil 92 and the central coil 94.

[0096] As is apparent from the following FIG. 5, providing respective protection for the magnetizable material 110 itself represents an embodiment of the present invention. This feature may help to limit the electromagnetic interaction between the outer coil 92 and the central coil 94, particularly by shielding these outer and central coils 92 and 94 from each other inside the winding head W. Specifically, as will be described below with reference to FIG. 4, it may help to concentrate the respective magnetic field lines 116 of the outer coil 92 and the central coil 94 near their respective outer and central coils 92 and 94. However, with respect to the central coil 94, since the shield assembly 96 does not cover the side and bottom surfaces of the central coil 94, this can be achieved to a lesser extent compared to the embodiment of FIG. 4.

[0097] Returning to FIG. 4, it will be appreciated that the shield assembly 96 also covers the lateral surface 114 of the central coil 94 and constitutes a further horizontal projection 120 of the magnetizable material 110 that extends parallel to the horizontal projections between the outer coil 92 and the central coil 94. Thus, it is preferred that the laterally angled portion of the shield assembly 96, or generally the portion of the shield assembly 96 that shields or surrounds the winding head W, has an E-shaped cross-section. Depending on the exact configuration, it is preferred that the legs of such an E-shaped cross-section have different lengths. For example, in FIG. 4, the upper leg is preferably longer than the central and lower legs formed by the respective projections 120 of the magnetizable material 110.

[0098] Each of the lateral surfaces 114 of the outer coil 92 and the central coil 94 is partially surrounded inside the winding head W and thus by the shield assembly 96, and more specifically, is surrounded by three sides. This helps to concentrate the electromagnetic fields generated by these outer and central coils 92 and 94 near them. More precisely, as depicted in FIG. 4, most of the magnetic field lines 116 are induced by the shield door assembly 96, particularly with the assistance of the horizontal protrusions between the conductor sections, and closed circles of each magnetic field line 116 can be generated. In particular, most of the magnetic field lines 116 of the outer coil 92 can be prevented from extending through the central coil 94, and as a result, the electromagnetic interaction between these outer coil 92 and the central coil 94 can be restricted.

[0099] A further embodiment of the present invention is shown in FIG. 6. In this case, the conductor sections inside the winding head W are spaced apart horizontally rather than vertically. More precisely, they are preferably spaced apart along the lateral axis LA, that is, within the plane in which at least the active sections of the outer coil 92 and the central coil 94 are formed. Specifically, the conductor section of the central coil 94 is preferably spaced apart from the conductor section of the outer coil 92 by a second distance D2 as depicted in FIG. 6 along the lateral axis LA. This distance is particularly with respect to the lateral faces 114 of these conductor sections. In other words, it is measured between these lateral faces 114. On the other hand, the vertical distance between the conductor sections can be made regular, such as the equidistant intervals according to FIG. 3. Thereby, although the vertical size of the winding head W is particularly restricted, the vertical distance can also be configured according to the embodiments of FIGS. 4 and 5 in order to achieve a particularly strong electromagnetic decoupling between the outer coil 92 and the central coil 94 inside the winding head W.

[0100] Note that in FIG. 6, the horizontal / lateral distance between the conductor sections of the outer coil 92 is zero. Therefore, each first distance D1 between these conductor sections is not depicted in FIG. 6. Also, the second horizontal / lateral distance D2 between the outer coil 92 and the central coil 94 is preferably equal with respect to both of these outer coils 92. Therefore, in the language of this claim, the second distance D2 of the central coil 94 with respect to each of the further conductor sections of the outer coil 92 is thus equivalent to each other.

[0101] On the other hand, the shield door assembly 96 is preferably configured in the same manner as in the example of FIG. 3. This also means that the magnetic field lines 116 are similarly guided through all the conductor sections inside the winding head W, but it is preferable that the horizontal length of the magnetic field lines 116 is increased by the second distance D2. This means that, particularly in the region of the air gap formed by the second distance D2 in the horizontal direction, the magnetic flux becomes weaker. Also in this case, the electromagnetic interaction between the outer coil 92 and the central coil 94 is restricted, and particularly the influence of the outer coil 92 on the central coil 94 is restricted.

[0102] FIG. 7 shows the conductor arrangement 90 of FIG. 6 without the shield door assembly 96 when viewed from above. Here too, the horizontal displacement of the central coil 94 with respect to the outer coil 92 can be seen. Note that the term "outer" relates to the position of the outer coil 92 along the longitudinal axis LO. As is clear from the described symmetry axis S, the lateral dimension of the central coil 94 is smaller than that of the outer coil 92. However, such a configuration can be said not to have a great influence on the characteristics of the outer coil 92 and the central coil 94 when considering the actually relevant dimensions, for example, dimensions much larger along the longitudinal axis than those depicted. Therefore, even with such an outer coil 92 and central coil 94, when exposed to an electromagnetic field, an equivalent current will still be induced.

Explanation of reference numerals

[0103] 1a, 1c: Phase conductor (outer member), 1b: Phase conductor (central member), 2: Track, 4: Vehicle, 4a: Energy storage device, 4b: Receiver, 5a, 5c: Phase line (outer member), 5b: Phase line (central member), 7a, 7b: Wheels, 90: Conductor arrangement, 92: Outer coil (first coil, second coil), 92M: Geometric center, 94: Central coil (third coil), 94M: Geometric center, 96: Shield door assembly, 100: Inductive power transmission device, 102: Primary side, 104: Secondary side, 110: Magnetizable material object, 112: Predetermined region having an enlarged angle, 114: Lateral plane, 116: Magnetic field lines, 120: Protrusion, A: Active section, D1: First distance, D2: Second distance, F: Magnetic field lines (magnetic flux lines), LA: Lateral axis, LO: Longitudinal axis, S: Axis of symmetry, W: Winding head, Z: Vertical spatial axis

Claims

1. A conductor arrangement for inductive power transfer, wherein the conductor arrangement comprises first to third coils which are arranged along a longitudinal axis (LO) and are formed by at least one conductor and are at least three coils, with a direction orthogonal to the longitudinal axis (LO) being a lateral axis (LA), along which, arranged opposite to each other, each of the first to third coils includes at least two winding heads (W) extending along the longitudinal axis (LO), and which has a magnetizable material as part of a shield assembly extending along the winding head (W), wherein, when the third coil is arranged at the lowermost position among the first to third coils, the magnetizable material is arranged to cover the upper and side surfaces of the first to third coils and the lower surface of the third coil, furthermore, the magnetizable material extends at least partially parallel to a plane in which at least one of the first to third coils is formed and is formed as a protrusion protruding along the lateral axis (LA), the protrusion is arranged between at least two of the coils inside at least one of the winding heads (W) such that the magnetizable material forms an E-shaped cross section when viewed from the longitudinal axis (LO), and extends by at least half the length of the winding head along the longitudinal axis (LO), a conductor arrangement for inductive power transfer, characterized in that.

2. The conductor arrangement for inductive power transfer according to claim 1, characterized in that the third coil is at least partially arranged between the first coil and the second coil when viewed along the longitudinal axis (LO).

3. The conductor arrangement for inductive power transfer according to claim 1 or 2, characterized in that the third coil has a lateral dimension along the lateral axis (LA) which is smaller than those of the first coil and the second coil, and the lateral dimension extends between two of the winding heads (W).

4. The conductor arrangement for inductive power transfer according to claim 1 or 2, characterized in that the magnetizable material is arranged between the third coil and one of the first coil and the second coil inside each winding head (W).

5. When cut in a plane along the transverse axis (LA), the transverse dimension of the magnetizable material object disposed at the upper part is longer than the transverse dimension of the magnetizable material object disposed at the lower part of the conductor arrangement and the magnetizable material object disposed between the two coils. The conductor arrangement for inductive power transmission according to claim 1 or 2, characterized in that.

6. An inductive power transmission device comprising the conductor arrangement for inductive power transmission according to claim 1 or 2, Comprising a primary side configured to generate an electromagnetic field and a secondary side configured to receive an electromagnetic field, thereby generating magnetic induction on the secondary side, The inductive power transmission device, characterized in that at least one of the primary side and the secondary side comprises the conductor arrangement.

7. The inductive power transmission device according to claim 6, characterized in that the secondary side is mounted on a land vehicle and the primary side is disposed around the land vehicle.

8. A method for forming a conductor arrangement for inductive power transmission, In order to form the conductor arrangement, a step of arranging first to third coils, which are at least three coils, along the longitudinal axis (LO); With the direction perpendicular to the longitudinal axis (LO) as the transverse axis (LA), along the transverse axis (LA), at least two winding heads (W) that are arranged opposite to each other and each of the first to third coils is along the longitudinal axis (LO) and extend along each other are formed; A step of arranging a magnetizable material object as a part of a shield door assembly extending along the winding head (W); When the third coil is viewed in the state of being disposed at the lowermost among the first to third coils, a step of arranging the magnetizable material object so as to cover the upper part and the side surface of the first to third coils and the lower part of the third coil. When the third coil is arranged at the lowermost position among the first to third coils, the magnetizable material is at least partially parallel to the plane in which at least one of the first to third coils is formed, and is a protrusion protruding along the lateral axis (LA), and the protrusion is arranged between at least two of the coils inside at least one of the winding heads (W) such that the magnetizable material forms an E-shaped cross section when viewed from the longitudinal axis (LO), and extending the protrusion with a length of at least half of the length of the winding head along the longitudinal axis (LO). A method for forming a conductor arrangement for inductive power transmission, characterized by including the steps of:

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