Three-phase electromagnetic coupling mechanism and wireless power transmission system

Abstract

The invention provides a three-phase electromagnetic coupling mechanism and a wireless power transmission system, and relates to the technical field of wireless power transmission. The three-phase electromagnetic coupling mechanism comprises a magnetic core layer, an A-phase coil, a B-phase coil and a C-phase coil, the A-phase coil, the B-phase coil and the C-phase coil are arranged on the magnetic core layer in a stacked mode, the A-phase coil, the B-phase coil and the C-phase coil form a double-layer stacked structure, and each phase of coil is provided with coil sections arranged on different layers of the double-layer stacked structure; and all the coil sections of each phase of coil cover a 240-degree corresponding area along the circumferential direction of the magnetic core layer. The three-phase coils forming the double-layer laminated structure are arranged on the magnetic core layer, so that each phase coil participates in magnetic field establishment in the height direction and the circumferential direction at the same time, the coverage range of each phase coil in the double-layer structure is consistent, the problems of non-uniform magnetic field distribution and unstable magnetic coupling can be solved, and the magnetic field stability is improved. Therefore, the wireless power transmission efficiency and stability are improved.

Description

A three-phase electromagnetic coupling mechanism and a wireless power transfer system Technical Field

[0001] This invention relates to the field of wireless power transmission technology, and more specifically, to a three-phase electromagnetic coupling mechanism and a wireless power transmission system. Background Technology

[0002] Wireless Power Transfer (WPT) technology relies on magnetic field coupling between the transmitting and receiving sides to achieve the wireless and contactless transfer of electrical energy.

[0003] In current wireless power transmission applications, single-phase coils are mostly used to transmit or receive electrical energy. However, the magnetic field generated by a single-phase coil is pulsating, with limited flux coverage and magnetic coupling capability that fluctuates significantly with changes in the relative positions of the coils. This results in limited power density, weak anti-offset capability, and insufficient transmission stability. To address this, related technologies have attempted to use three-phase coil structures to generate a rotating magnetic field, making the magnetic field distribution more uniform and enhancing anti-offset capability. However, existing three-phase coil structures often employ planar arrangements or simple stacking, limiting the spatial participation of each phase coil in the vertical direction. This makes it difficult to effectively utilize the three-dimensional space near the core layer, resulting in an uneven magnetic field distribution across different height planes for each phase coil. This can easily lead to localized flux accumulation or weakening areas, thereby reducing the efficiency and stability of wireless power transmission. Summary of the Invention

[0004] The problem this invention addresses is how to improve the efficiency and stability of wireless power transmission.

[0005] To address the above problems, the present invention provides a three-phase electromagnetic coupling mechanism and a wireless power transmission system.

[0006] In a first aspect, the present invention provides a three-phase electromagnetic coupling mechanism, including a magnetic core layer and an A-phase coil, a B-phase coil, and a C-phase coil stacked on the magnetic core layer. The A-phase coil, the B-phase coil, and the C-phase coil form a double-layer stacked structure, and each phase coil has coil segments disposed in different layers of the double-layer stacked structure. All the coil segments of each phase coil cover a 240° corresponding area along the circumference of the magnetic core layer.

[0007] Optionally, the A-phase coil, the B-phase coil, and the C-phase coil each include four electrically connected coil segments, each coil segment covering a 60° corresponding area along the circumference of the magnetic core layer; the two sets of coil segments of each phase coil are located in different layers of the double-layer stacked structure, and each set of coil segments includes two coil segments arranged opposite each other.

[0008] Optionally, the four coil segments of each phase coil have the same orthographic projection shape on the magnetic core layer and are deflected by 90° in sequence.

[0009] Optionally, the A-phase coil, the B-phase coil, and the C-phase coil located on the same layer of the double-layer stacked structure have the same orthographic projection shape on the magnetic core layer, and are deflected by 60° in sequence.

[0010] Optionally, each of the coil segments is fan-shaped.

[0011] Optionally, the orthographic projection of all the coil segments located in the first layer of the double-layer stacked structure onto the magnetic core layer has the same shape as the orthographic projection of all the coil segments located in the second layer of the double-layer stacked structure onto the magnetic core layer, and is offset relative to each other by 30°.

[0012] Optionally, the average distance from each phase coil to the core layer is equal, and the average distance is the weighted average of the distances from the coil segments of the corresponding phase coils to the core layer in each layer of the double-layer stacked structure.

[0013] In a second aspect, the present invention also provides a wireless power transmission system, including a wireless power transmitting mechanism and a wireless power receiving mechanism, wherein at least one of the wireless power transmitting mechanism and the wireless power receiving mechanism includes a three-phase electromagnetic coupling mechanism as described in the first aspect.

[0014] Optionally, the wireless power transmission mechanism includes a first three-phase electromagnetic coupling mechanism, a primary-side resonant mechanism, a three-phase inverter, and a DC power supply, wherein the DC power supply, the three-phase inverter, the primary-side resonant mechanism, and the first three-phase electromagnetic coupling mechanism are electrically connected in sequence.

[0015] Optionally, the wireless power transmitting mechanism includes a second three-phase electromagnetic coupling mechanism, a secondary resonant mechanism, and a three-phase rectifier, wherein the second three-phase electromagnetic coupling mechanism, the secondary resonant mechanism, and the three-phase rectifier are electrically connected in sequence.

[0016] The beneficial effects of the three-phase electromagnetic coupling mechanism and wireless power transmission system of the present invention are as follows: The three-phase electromagnetic coupling mechanism of the present invention, by arranging A-phase coils, B-phase coils, and C-phase coils in a double-layer stacked structure on the magnetic core layer, enables each phase coil to simultaneously participate in magnetic field establishment in the direction perpendicular to the magnetic core layer, thereby overcoming the space utilization limitation problem caused by the three-phase coils being arranged only in a single plane in related technologies. By ensuring that each phase coil has coil segments arranged in different layers of the double-layer stacked structure, the three-phase coils collaboratively participate in the electromagnetic coupling process at different levels of the double-layer structure, improving the magnetic field coverage capability in the three-dimensional space near the magnetic core layer. Furthermore, by limiting all coil segments of each phase coil to jointly cover a 240° corresponding area along the circumferential direction of the magnetic core layer, the total circumferential coverage range of each phase coil in the double-layer stacked structure remains consistent, facilitating the consistency and symmetry of the spatial distribution of the A-phase, B-phase, and C-phase coils in the double-layer stacked structure. This ensures that each phase coil participates in the circumferential space of the magnetic core layer to the same degree at different levels, helping to avoid differences in magnetic field distribution caused by inconsistent circumferential coverage ranges of different phase coils. Therefore, the three-phase electromagnetic coupling mechanism, through the rational configuration of the double-layer stacked structure and the circumferential coverage of the three-phase coils, enables the three-phase coils to achieve more full and uniform spatial participation in both the height and circumferential directions. This effectively improves the problems of uneven magnetic field distribution, insufficient spatial participation, and poor magnetic coupling stability in related technologies. Thus, it provides a three-phase electromagnetic coupling mechanism for wireless power transmission systems with a more reasonable magnetic field coverage, higher coupling efficiency, and more stable operation, thereby effectively improving the efficiency and stability of wireless power transmission. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the three-phase electromagnetic coupling mechanism in an embodiment of the present invention; Figure 2 is an exploded view of the three-phase electromagnetic coupling mechanism in an embodiment of the present invention; Figure 3 is a schematic diagram of the three-phase electromagnetic coupling mechanism from another perspective in an embodiment of the present invention; Figure 4 is a schematic diagram of the structure of one phase coil in the three-phase coil in an embodiment of the present invention; Figure 5 is a schematic diagram of the structure of the wireless power transmission system in an embodiment of the present invention; Figure 6 is a schematic diagram of the structure of the wireless power transmitting mechanism and the wireless power receiving mechanism, both of which employ the three-phase electromagnetic coupling mechanism in an embodiment of the present invention.

[0018] Reference numerals in the attached diagram: 1. Phase A coil; 2. Phase B coil; 3. Phase C coil; 4. Magnetic core layer; 5. Wireless power transmitting mechanism; 51. First three-phase electromagnetic coupling mechanism; 52. Primary-side resonant mechanism; 53. Three-phase inverter; 54. DC power supply; 6. Wireless power receiving mechanism; 61. Second three-phase electromagnetic coupling mechanism; 62. Secondary-side resonant mechanism; 63. Three-phase rectifier; 7. Load. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0021] Referring to Figures 1-4, this embodiment of the invention provides a three-phase electromagnetic coupling mechanism, including a magnetic core layer 4 and A-phase coil 1, B-phase coil 2 and C-phase coil 3 stacked on the magnetic core layer 4. The A-phase coil 1, B-phase coil 2 and C-phase coil 3 form a double-layer stacked structure, and each phase coil has coil segments disposed in different layers of the double-layer stacked structure; all coil segments of each phase coil cover a 240° corresponding area along the circumference of the magnetic core layer 4.

[0022] In this embodiment, the three-phase electromagnetic coupling mechanism can be applied to the wireless power transmitting mechanism 5 and / or the wireless power receiving mechanism 6 of the wireless power transmission system to improve the efficiency and stability of wireless power transmission between the wireless power transmitting mechanism 5 and the wireless power receiving mechanism 6.

[0023] Specifically, the three-phase electromagnetic coupling mechanism includes a magnetic core layer 4 and three-phase coils (i.e., phase A coil 1, phase B coil 2, and phase C coil 3) disposed on the magnetic core layer 4. The three-phase coils are stacked in a double-layer manner relative to the magnetic core layer 4 along the vertical direction (as shown by the Z-axis in Figure 1, which is perpendicular to the magnetic core layer 4), forming a double-layer stacked structure. The double-layer stacked structure includes a first layer and a second layer arranged sequentially along the vertical direction (such as the direction perpendicular to the magnetic core layer 4). The magnetic core layer 4 is used to provide a magnetic flux channel for the three-phase electromagnetic coupling mechanism, and the magnetic field generated by each phase coil during operation is coupled through the magnetic core layer 4. In order to effectively utilize the three-dimensional space of the three-layer stacked structure and improve the magnetic field coverage capability of the three-phase coils in this three-dimensional space, each phase coil has coil segments distributed in different layers of the double-layer stacked structure. That is, the coil structure of the same phase occupies two different layers in the vertical direction at the same time, so that each phase coil has multi-layer distribution characteristics in the stacked structure.

[0024] All coil segments of each phase coil collectively cover a 240° area along the circumferential direction of the core layer 4. In other words, when each phase coil has multiple coil segments, the sum of the coverage angles of each coil segment in that phase coil along the circumferential direction of the core layer 4 is 240°. Correspondingly, phase A coil 1, phase B coil 2, and phase C coil 3 collectively cover a 720° area along the circumferential direction of the core layer 4. This 720° is the cumulative result of the circumferential coverage of the three phase coils, corresponding to the double-layer structure of the double-layer stacked structure. This allows the three phase coils to collaboratively cover the circumferential space of the core layer 4 at different levels within the double-layer stacked structure, thus facilitating full utilization of space within each layer of the double-layer stacked structure. For example, in each layer of the double-layer stacked structure, the coil segments corresponding to phase A coil 1, phase B coil 2, and phase C coil 3 can jointly cover the 360° area of ​​that layer in the circumferential direction, so that the three-phase coils form a continuous circumferential distribution relationship in that layer. This is beneficial to achieve a uniform distribution of the three-phase coils in each layer of the double-layer stacked structure and avoid the situation of insufficient utilization of circumferential space.

[0025] In summary, the three-phase electromagnetic coupling mechanism of this embodiment overcomes the space utilization limitation caused by the arrangement of three-phase coils in a single plane in related technologies by setting A-phase coil 1, B-phase coil 2, and C-phase coil 3 in a double-layer stacked structure on the magnetic core layer 4. This allows each phase coil to participate in the magnetic field establishment simultaneously in the direction perpendicular to the magnetic core layer 4. By ensuring that each phase coil has coil segments set in different layers of the double-layer stacked structure, the three-phase coils participate in the electromagnetic coupling process collaboratively at different levels of the double-layer structure, improving the magnetic field coverage capability in the three-dimensional space near the magnetic core layer 4. Moreover, by limiting all coil segments of each phase coil to jointly cover a 240° area along the circumferential direction of the magnetic core layer 4, the total circumferential coverage range of each phase coil in the double-layer stacked structure remains consistent. This facilitates the consistency and symmetry of the spatial distribution of A-phase coil 1, B-phase coil 2, and C-phase coil 3 in the double-layer stacked structure, ensuring that each phase coil participates in the circumferential space of the magnetic core layer 4 to the same degree at different levels, thus avoiding differences in magnetic field distribution caused by inconsistent circumferential coverage ranges of different phase coils. Therefore, the three-phase electromagnetic coupling mechanism, through the rational configuration of the double-layer stacked structure and the circumferential coverage of the three-phase coils, enables the three-phase coils to achieve more full and uniform spatial participation in both the height and circumferential directions. This effectively improves the problems of uneven magnetic field distribution, insufficient spatial participation, and poor magnetic coupling stability in related technologies. Thus, it provides a three-phase electromagnetic coupling mechanism for wireless power transmission systems with a more reasonable magnetic field coverage, higher coupling efficiency, and more stable operation, thereby effectively improving the efficiency and stability of wireless power transmission.

[0026] Optionally, phase A coil 1, phase B coil 2 and phase C coil 3 each include four electrically connected coil segments, each coil segment covering a 60° corresponding area along the circumference of the magnetic core layer 4; the two sets of coil segments of each phase coil are located in different layers of the double-layer stacked structure, and each set of coil segments includes two coil segments arranged opposite to each other.

[0027] In this embodiment, to ensure uniform magnetic coupling characteristics of the three-phase coils in the double-layer stacked structure, each layer of the double-layer stacked structure is provided with a set of oppositely arranged coil segments of the three-phase coils. Specifically, phase A coil 1 includes four electrically connected coil segments, phase B coil 2 includes four electrically connected coil segments, and phase C coil 3 includes four electrically connected coil segments. The four electrically connected coil segments of each phase coil constitute two sets of coil segments (each set of coil segments includes two oppositely arranged coil segments). The two sets of coil segments of each phase coil are respectively arranged in the first layer and the second layer, so that a set of coil segments of phase A coil 1, phase B coil 2, and phase C coil 3 exists simultaneously in any layer. By distributing the coil segments of different phases within the same layer, this layer can simultaneously participate in the establishment of the magnetic field of multiple phases during electromagnetic coupling, which helps to create mutually overlapping magnetic field coverage areas between different layers of the three-phase coils. In this structure, since the coil segments of each phase coil are respectively set in different layers of the double-layer stacked structure, the same phase coil participates in the establishment of the magnetic field in the direction perpendicular to the magnetic core layer 4 at the same time. This allows the three-phase coils distributed in each layer of the double-layer stacked structure to play a role in magnetic flux distribution, magnetic flux transmission path and electromagnetic coupling relationship. It can avoid the space utilization limitation problem caused by the three-phase coils being distributed in only a single plane, and avoid the situation where a certain layer only participates in the magnetic coupling of a single phase coil. Moreover, compared with the single-layer arrangement of three-phase coil structure, the double-layer stacked structure can form a magnetic field coverage area with height distribution near the magnetic core layer 4, so that the magnetic flux can be effectively utilized in different height planes. Moreover, each coil segment covers a 60° area along the circumference of the magnetic core layer 4, which facilitates the formation of a continuous and uniform coverage layout of the six coil segments (including a group of coil segments of each phase coil in phase A coil 1, phase B coil 2 and phase C coil 3) in each layer of the double-layer stacked structure. This allows for full utilization of space within each layer of the double-layer stacked structure, avoids local magnetic flux concentration or magnetic flux weakening, and makes the magnetic field distribution in space smoother and more continuous, which is conducive to forming a stable and balanced magnetic coupling basic structure.

[0028] In summary, the three-phase electromagnetic coupling mechanism of this embodiment, by setting A-phase coil 1, B-phase coil 2, and C-phase coil 3 in a double-layer stacked structure on the magnetic core layer 4, allows the three-phase coils to simultaneously participate in magnetic field establishment in the direction perpendicular to the magnetic core layer 4, thereby overcoming the space utilization limitation problem caused by the arrangement of three-phase coils in only a single plane in related technologies. By dividing each phase coil into four electrically connected coil segments and arranging the two sets of opposite coil segments in different layers of the double-layer stacked structure, each layer of the double-layer structure simultaneously contains one set of coil segments of the three-phase coils, thus avoiding the situation where a certain layer only participates in the magnetic coupling of a single phase coil, resulting in uneven magnetic field distribution. Furthermore, by making each coil segment cover a 60° area along the circumference of the magnetic core layer 4, the six coil segments located in each layer of the double-layer stacked structure form a continuous and uniform coverage layout in the circumferential direction of the magnetic core layer 4, effectively avoiding the problem of local magnetic flux concentration or magnetic flux weakening, and making the distribution of the magnetic field in space smoother and more continuous. Therefore, the three-phase electromagnetic coupling mechanism can form a magnetic field coverage area with a balanced distribution in both the height and circumferential directions near the core layer 4, thereby improving the overall utilization efficiency of magnetic flux. Without significantly increasing the structural complexity, it achieves the equalization of the magnetic field distribution of the three-phase coil and the maximization of space utilization. It effectively solves the problems of uneven magnetic field distribution, insufficient spatial participation, and poor magnetic coupling stability in the three-phase coil structure, and provides a three-phase electromagnetic coupling mechanism with higher magnetic coupling efficiency and more stable operation for wireless power transmission systems.

[0029] Optionally, as shown in Figures 1-4, the four coil segments of each phase coil have the same orthographic projection shape on the magnetic core layer 4, and are deflected by 90° in sequence.

[0030] In this embodiment, phase A coil 1 includes four electrically connected coil segments, phase B coil 2 includes four electrically connected coil segments, and phase C coil 3 includes four electrically connected coil segments. The four coil segments of each phase coil are arranged sequentially along the circumference of the magnetic core layer 4, and each coil segment covers a 60° area along the circumference of the magnetic core layer 4, so that the four coil segments of each phase coil together form a circumferential arrangement structure based on the magnetic core layer 4. For any phase coil, the orthographic projection shape of its four coil segments in the direction perpendicular to the magnetic core layer 4 is the same, that is, the shape of the coverage area of ​​each coil segment on the plane of the magnetic core layer 4 is consistent; and the orthographic projection of the four coil segments is deflected by 90° in sequence, that is, the four coil segments are arranged in a equiangular distribution relationship in space (similar to the distribution of four-leaf clover leaves), so that each phase coil can form a uniform circumferential structure composed of four coil segments.

[0031] Optionally, the A-phase coil 1, B-phase coil 2 and C-phase coil 3 located on the same layer of the double-layer stacked structure have the same orthographic projection shape on the magnetic core layer 4, and are deflected by 60° in sequence.

[0032] In this embodiment, the orthographic projections of phase A coil 1, phase B coil 2, and phase C coil 3 on the core layer 4 are identical. Specifically, the planar areas covered by the three coils in the top view have the same shape, and all three form projection areas of equal area and equal contour on the core layer 4. By making the three coils have consistent orthographic projections, the three coils can have consistent geometric ranges in structure. Based on this, the orthographic projections of phase A coil 1, phase B coil 2, and phase C coil 3 are successively deflected by 60° along the circumferential direction of the core layer 4. For example, the orthographic projection of phase A coil 1 is located within a certain initial angle range, the orthographic projection of phase B coil 2 is deflected by 60° relative to phase A coil 1 along the circumferential direction, and the orthographic projection of phase C coil 3 is further deflected by 60° relative to phase B coil 2. This arrangement, with each coil deflected by 60°, serves several purposes. First, it allows for the simultaneous placement of three-phase coils within the same layer of the double-layer stacked structure, ensuring a tight fit and uniform circumferential distribution between the coils in each layer, thus improving space utilization. Second, the periodic, equiangular circumferential distribution of the three-phase coils around the core layer 4 contributes to the symmetry and spatial balance of the three-phase coil structure, providing a stable foundation for the magnetic coupling between each phase coil and the core layer 4 in the three-phase electromagnetic coupling mechanism. Third, it ensures the regularity of the coil segments in the planar arrangement, resulting in a more orderly and symmetrical coil distribution throughout the double-layer stacked structure, which is beneficial for achieving structural stability and consistency in subsequent electromagnetic coupling designs.

[0033] Optionally, each coil segment is fan-shaped.

[0034] In this embodiment, the orthographic projection of each coil segment onto the magnetic core layer 4 is a fan-shaped structure. Specifically, the area covered by the coil segment in the top view is a fan-shaped region extending circumferentially with the center of the magnetic core layer 4 as the center. This fan-shaped region has a preset arc boundary and two radial boundaries, thereby forming a clear angular range and fan-shaped outline. When the coil segment is fan-shaped, the proportion of each coil segment covering the circumferential area of ​​the magnetic core layer 4 can be determined by the ratio between the central angle of the corresponding sector and 360°. For example, when the sector angle covered by a coil segment in the circumferential area of ​​the magnetic core layer 4 is θ°, the coverage proportion of the coil segment can be expressed as θ° / 360°. Since the coverage area of ​​the coil segment in the circumferential direction of this application is a fixed sector angle, the coverage proportion can be directly quantified by the central angle.

[0035] Thus, by adopting a fan-shaped projection structure, the circumferential coverage area of ​​the coil segment can have a clear geometric boundary, which is beneficial for achieving a regular coil arrangement around the core layer 4.

[0036] Optionally, the orthographic projection of all coil segments in the first layer of the double-layer stacked structure onto the core layer 4 has the same shape as the orthographic projection of all coil segments in the second layer of the double-layer stacked structure onto the core layer 4, but is deflected by 30° relative to each other.

[0037] In this embodiment, each layer of the double-layer stacked structure contains coil segments from each phase coil. The orthographic projections of all coil segments in the first layer of the double-layer stacked structure onto the core layer 4 have the same shape as the orthographic projections of all coil segments in the second layer onto the core layer 4. Furthermore, the orthographic projections of the second layer coil segments relative to the first layer coil segments are deflected by 30° along the circumferential direction of the core layer 4. This deflection can be achieved by rotating all coil segments in the second layer 30° relative to the first layer in the circumferential direction when arranging the second layer coil segments. By setting a fixed deflection angle, a regular interlayer offset relationship can be formed between the two layers of coil segments in the spatial structure. This interlayer deflection design ensures that the double-layer stacked structure maintains the consistency of the planar orthographic projection while preventing the two layers of coil segments from overlapping in space and forming a regular angular difference. This facilitates the formation of a periodic and uniform double-layer coverage around the core layer 4. Combined with the phase difference of the three-phase current input to the three-phase coils, this enhances the generated magnetic field and increases mutual inductance.

[0038] Optionally, the arrangement of coil segments, wire connection method, or winding direction of each phase coil can be set according to polarity requirements, so that the coil segments can form a preset magnetic field direction distribution when energized. For example, two opposite coil segments on the same layer of each phase coil have the same polarity, and two adjacent coil segments on different layers have opposite polarities, so as to form a polarity arrangement that changes alternately along the circumference.

[0039] For example, referring to Figure 3 (in the figure, A+ represents the positive polarity coil segment of phase A coil 1, A- represents the negative polarity coil segment of phase A coil 1; B+ represents the positive polarity coil segment of phase B coil 2, B- represents the negative polarity coil segment of phase B coil 2; C+ represents the positive polarity coil segment of phase C coil 3, C- represents the negative polarity coil segment of phase C coil 3), each phase coil consists of four coil segments, which are distributed in two layers of the double-layer stacked structure. Each layer contains two coil segments with opposite angles. In the same layer, because the two coil segments with opposite angles use the same winding direction or wire connection method, they form the same polarity when energized; while adjacent coil segments in the other layer, due to their opposite winding direction or different wire flipping method, can form a different polarity than the previous layer when energized. Through the above arrangement, the four coil segments of each phase coil present a regular distribution of same polarity in the same layer and opposite polarity between layers (or relatively same polarity, adjacent opposite polarity) when viewed from above, thereby forming a periodic, spatially interlaced magnetic field structure around the magnetic core layer 4.

[0040] Referring to Figure 4, the hollow arrows in the figure are used to indicate the direction of magnetic flux generated by the positive and negative coil segments of the corresponding phase coil under the drive of the operating current. Specifically, the four coil segments of the corresponding phase coil in Figure 4 correspond to two different polarity distributions. Two coil segments arranged opposite each other in the same layer form magnetic fields in the same direction after being energized due to the same winding direction or wire connection method, which is indicated by hollow arrows pointing in the same direction. Adjacent coil segments in different layers form magnetic fields in opposite directions after being energized due to opposite winding directions or reversed electron paths, and their magnetic flux directions are also indicated by hollow arrows pointing in opposite directions. After the coil is energized with alternating current, the positive and negative coil segments form alternating magnetic flux paths around the magnetic core layer 4 in the directions shown in the figure, so that the phase coil presents a periodically alternating magnetic field structure in a local area.

[0041] Thus, the A-phase coil 1, B-phase coil 2, and C-phase coil 3 of the three-phase electromagnetic coupling mechanism each form a double-layer coil segment structure with circumferential distribution characteristics on the magnetic core layer 4. The coil segments of each phase coil are arranged in different layers of the double-layer stacked structure, and according to the polarity design, opposite coil segments in the same layer have the same polarity, while adjacent coil segments in different layers have opposite polarities. Through this double-layer bipolar coil structure, the magnetic fields generated by the upper and lower layers of each phase coil superimpose in the same circumferential region during operation, while the magnetic fields in adjacent regions are staggered, thereby forming a magnetic flux distribution with a distinct periodic structure and prominent directionality around the magnetic core layer 4. Furthermore, the three-phase coils are driven by three-phase alternating currents when transmitting magnetic energy, and the phases of the three-phase currents maintain a 120° phase difference, allowing the three-phase coils to sequentially reach the magnetic field peak in the time domain. Combined with the superposition effect of the same-polarity coil segments and the interleaving effect of the opposite-polarity coil segments in the double-layer stacked structure, the three-phase magnetic field forms a uniformly rotating magnetic field structure in space. At any given moment, the total positive and negative magnetic energy of the rotating magnetic field remains essentially constant, achieving a balanced distribution and continuous rotation of magnetic field energy. Through the double-layer bipolar interleaved arrangement and the three-phase 120° phase difference drive, the three-phase electromagnetic coupling mechanism generates a stronger transverse magnetic field component around the core layer 4, enhancing the magnetic flux coverage in the planar direction and improving the coupling strength of the magnetic field to the receiving end. Based on this, since the magnetic field exhibits a multi-level differentiated structure in the circumferential direction, and the rotating magnetic field avoids the problems of magnetic flux pulsation and discontinuous distribution in traditional single-phase structures, the three-phase electromagnetic coupling mechanism can provide stronger magnetic coupling capability and higher transmission performance in high-power-density and high-stability application scenarios.

[0042] Optionally, the average distance from each phase coil to the core layer 4 is equal, and the average distance is the weighted average of the distances from the coil segments of the corresponding phase coils in each layer of the double-layer stacked structure to the core layer 4.

[0043] In this embodiment, since each phase coil has coil segments disposed in different layers, each phase coil forms a different local distance distribution relative to the core layer 4. Based on this, by geometrically designing the position of each phase coil in the coil stack structure, the average distance of the three phase coils relative to the core layer 4 can be made equal. The average distance is the weighted average of the distances from the coil segments of each layer of the corresponding phase coil to the core layer 4. For example, different weights can be assigned to these distances based on the distance between the coil segments of the corresponding phase coil in each layer and the core layer 4 (the weights can be determined based on the proportion of each coil segment in the circumference or space of the corresponding phase coil) and weighted calculations can be performed to obtain the average distance of the phase coil as a whole. By making the average distance of the three phase coils to the core layer 4 equal, the three phase coils can form a consistent equivalent magnetic circuit length electromagnetically, thus making the self-inductance characteristics of the three phase coils basically consistent. Moreover, since the average distance of the three phase coils relative to the core layer 4 is equal, the coupling conditions between each phase coil in the core layer 4 are also consistent, making the equivalent mutual inductance characteristics between the three phases relatively balanced. Specifically, when the three-phase coils are in the same magnetic flux channel of the core layer 4, their magnetic flux coupling strength with the core layer 4 jointly determines the degree of coupling of the magnetic flux between phases. By keeping the average distance between the three-phase coils consistent, the magnetic flux generated by each phase can have a similar distribution range and penetration depth in the core layer 4, thereby achieving a relatively balanced state of equivalent mutual inductance between the three phases. This is beneficial for the three-phase electromagnetic coupling mechanism to form a stable three-phase current relationship and a symmetrical magnetic coupling path during operation.

[0044] In summary, the three-phase electromagnetic coupling mechanism of this embodiment, by arranging A-phase coil 1, B-phase coil 2, and C-phase coil 3 with double-layer distribution characteristics on the magnetic core layer 4 and ensuring that the average distances of the three-phase coils to the magnetic core layer 4 are equal, achieves a consistent equivalent magnetic circuit length for the three-phase coils along the electromagnetic coupling path. This effectively overcomes the problems of pulsating magnetic field distribution, limited magnetic flux coverage, and significant fluctuations in coupling capability with position in related technologies. Furthermore, compared to the defects of traditional three-phase coil structures, which suffer from unbalanced self-inductance and asymmetrical inter-phase mutual inductance due to inconsistent coil distances relative to the magnetic core, leading to unbalanced three-phase current and magnetic field distribution, the three-phase electromagnetic coupling mechanism of this embodiment, through its double-layer arrangement and consistent average distance from the magnetic core layer 4, ensures a high degree of consistency in the self-inductance and mutual inductance of the three-phase coils, enabling a more stable three-phase electromagnetic coupling relationship during wireless power transmission. Therefore, the three-phase electromagnetic coupling mechanism in this embodiment can effectively improve the coupling efficiency and transmission stability between the transmitting and receiving sides of wireless power transmission, providing a general and scalable three-phase electromagnetic coupling structure solution for building a high-efficiency and high-stability wireless power transmission system.

[0045] Optionally, the weight of the weighted average is determined based on the proportion of the coil segment of each phase coil located in each layer of the double-layer stacked structure on the 4-dimensional coverage of the magnetic core layer.

[0046] In this embodiment, each phase coil includes coil segments disposed in two different layers of a double-layer stacked structure, with each coil segment having a different vertical height from the core layer 4. Since each phase coil consists of four coil segments, and these coil segments are located in the two layers according to a preset circumferential distribution, the average distance of the corresponding phase coil as a whole from the core layer 4 can be determined by a weighted average method based on the distance between the layer containing each coil segment of the phase coil and the core layer 4, combined with the proportion of each coil segment of the phase coil in the circumferential coverage as a weight.

[0047] For example, for a given phase coil, two of its four coil segments are located in the first layer, and the other two are located in the second layer. Each coil segment covers an equal area around the core layer 4. Therefore, the average distance of this phase coil can be determined by the weighted average of the distances between the two layers. In another case, if the proportions of circumferential coverage of the coil segments in the first and second layers differ, the average distance can be a weighted average of the inter-layer distances corresponding to the proportions of each coil segment in the circumferential direction, reflecting the effective distance of the entire phase coil relative to the core layer 4.

[0048] Optionally, to ensure that the average distance can effectively determine and reflect the true electromagnetic coupling relationship of each phase coil relative to the core layer 4, it is preferable that each phase coil adopts a relatively uniform circumferential coverage layout, so that the coil segments do not exhibit excessive concentration or excessive sparse distribution in the circumferential direction. By making the coil segments have a more balanced coverage ratio in the circumferential direction, the weight of each coil segment in the average distance calculation can better reflect its contribution to the actual magnetic flux generated in the magnetic circuit, thereby enabling the final average distance to more accurately reflect the overall position of each phase coil in the stacked structure. In addition, the relative uniformity of the circumferential coverage can also reduce the coupling deviation caused by excessively high local magnetic flux density to a certain extent, making the equivalent distance of the three-phase coils in the direction of the core layer 4 more consistent, providing a basic guarantee for the three-phase electromagnetic coupling mechanism to obtain balanced electromagnetic performance.

[0049] For example, the coil segment of each phase coil can be formed by continuously winding a single conductor (excitation wire) along a preset circumferential path. The conductor is unfolded in a multi-turn manner in the circumferential direction, so that the coil segment has an overall fan shape when viewed from above. Since the distribution of each turn of the conductor in the circumferential direction of the coil segment is gradually expanding, and the spacing between each turn remains basically consistent, the coil segment forms a relatively uniform magnetic field contribution within the covered circumferential range. In this way, when calculating the weighted average distance, the weight of each layer of coil segments can be determined based on a clearly defined circumferential coverage ratio, so that the obtained average distance can accurately characterize the equivalent overall coupling position of the corresponding phase coil relative to the magnetic core layer 4, and the electromagnetic position of the phase coil in the double-layer stacked structure can be reasonably quantified.

[0050] It is worth noting that the specific interlayer distribution ratio of phase A coil 1, phase B coil 2, and phase C coil 3 (such as each coil segment covering a 60° area along the circumference of the magnetic core layer 4) is an exemplary interlayer distribution method used to illustrate that by appropriately setting the circumferential coverage ratio of each coil segment in different layers, the average distance of each phase coil relative to the magnetic core layer 4 can reach the same value. This is not the only implementation of the present invention. As long as each phase coil is distributed in different layers of the coil stack structure according to a preset ratio, and the average distance of the three phase coils is calculated to be equal by weighting the circumferential coverage ratio of each layer, the three-phase electromagnetic coupling consistency effect of the present invention can be achieved.

[0051] Referring to Figure 5, another embodiment of the present invention provides a wireless power transmission system, including a wireless power transmitting mechanism 5 and a wireless power receiving mechanism 6, wherein at least one of the wireless power transmitting mechanism 5 and the wireless power receiving mechanism 6 includes the three-phase electromagnetic coupling mechanism described above.

[0052] In this embodiment, the wireless power transmission system includes a wireless power transmitting mechanism 5 and a wireless power receiving mechanism 6. At least one of the wireless power transmitting mechanism 5 and the wireless power receiving mechanism 6 adopts the aforementioned three-phase electromagnetic coupling mechanism as an electromagnetic energy conversion unit.

[0053] The wireless power transmitting mechanism 5 and the wireless power receiving mechanism 6 can both employ a three-phase electromagnetic coupling mechanism, or they can be employed only on the transmitting side or the receiving side. For example, when the wireless power transmitting mechanism 5 employs a three-phase electromagnetic coupling mechanism while the wireless power receiving mechanism 6 employs a conventional receiving coil, the wireless power transmission system can still improve the magnetic flux coverage and the system's anti-offset capability through the three-phase magnetic field formed on the transmitting side. Conversely, when the wireless power receiving mechanism 6 employs a three-phase electromagnetic coupling mechanism, it can also enhance the receiver's adaptability to different spatial magnetic field distributions and improve energy capture efficiency. If the wireless power transmitting mechanism 5 includes a drive circuit for generating AC excitation signals and a three-phase electromagnetic coupling mechanism electrically connected to the drive circuit, when the wireless power transmission system is working, the drive circuit provides three-phase AC signals to the A-phase coil 1, B-phase coil 2 and C-phase coil 3 of the three-phase electromagnetic coupling mechanism, so that it establishes a rotating or periodic magnetic field distribution around the magnetic core layer 4, and radiates electrical energy into space in a magnetic coupling manner; if the wireless power receiving mechanism 6 includes a three-phase electromagnetic coupling mechanism for receiving electromagnetic energy and a rectifier circuit or energy storage device electrically connected to it, when the wireless power transmission system is working, the three-phase electromagnetic coupling mechanism on the receiving side generates an induced voltage in response to the change of the magnetic field on the transmitting side, and provides electrical energy to the load 7 after rectification or conversion.

[0054] Thus, by employing a three-phase electromagnetic coupling mechanism in the wireless power transmitting mechanism 5 and / or the wireless power receiving mechanism 6, the wireless power transmission system can fully utilize the advantages of the three-phase electromagnetic structure in terms of magnetic field distribution continuity, coupling stability, and anti-offset performance, enabling the wireless power transmission system to maintain high coupling efficiency and strong transmission stability under conditions of different position offsets, attitude changes, or working distance changes.

[0055] Optionally, as shown in Figures 5 and 6, the wireless power transmission system further includes a DC power supply 54, a three-phase inverter 53, and a primary-side resonant mechanism 52; the wireless power transmitting mechanism 5 includes a first three-phase electromagnetic coupling mechanism 51, and the DC power supply 54, the three-phase inverter 53, the primary-side resonant mechanism 52, and the first three-phase electromagnetic coupling mechanism 51 are electrically connected in sequence.

[0056] In this embodiment, the wireless power transmitting mechanism 5 includes a first three-phase electromagnetic coupling mechanism 51. Based on this, the wireless power transmission system also includes a DC power supply 54, a three-phase inverter 53, and a primary-side resonant mechanism 52. The DC power supply 54, the three-phase inverter 53, the primary-side resonant mechanism 52, and the first three-phase electromagnetic coupling mechanism 51 are connected in sequence to convert the DC power output by the DC power supply 54 into a high-frequency AC magnetic field suitable for electromagnetic coupling transmission.

[0057] Specifically, the DC power supply 54 provides stable DC power for wireless power transmission and can be a battery pack, rectifier, or other DC power supply device. The three-phase inverter 53 (such as a three-phase high-frequency inverter) is electrically connected to the DC power supply 54. Its internal switching transistors, through high-speed turn-on and turn-off operations, can invert the DC voltage from the DC power supply 54 into a three-phase high-frequency AC signal. The frequency of this three-phase high-frequency signal can be set according to the operating requirements of the wireless power transmission system to match the resonant frequency of the primary-side resonant mechanism 52. The primary-side resonant mechanism 52 is electrically connected to the three-phase inverter 53, and its structure may include three-phase resonant capacitors, three-phase resonant inductors, or other electrical components capable of forming a resonant circuit. Through the resonance effect of the primary-side resonant mechanism 52, the three-phase high-frequency AC signal output by the three-phase inverter 53 can be adjusted to suitable voltage, current, or phase conditions, providing stable excitation for subsequent magnetic coupling. The first three-phase electromagnetic coupling mechanism 51 is electrically connected to the primary-side resonant mechanism 52 and is used to establish a corresponding high-frequency magnetic field around the magnetic core layer 4 according to the three-phase high-frequency AC signal output by the primary-side resonant mechanism 52. When the wireless power transmission system is in operation, the first three-phase electromagnetic coupling mechanism 51 forms a periodic or rotating magnetic field distribution in space, so that magnetic energy is transmitted to the receiving side through spatial coupling, thereby realizing non-contact transmission of wireless power.

[0058] Thus, through the aforementioned electrical connections, the wireless power transmission system can realize a complete energy conversion link from DC input to high-frequency magnetic field excitation, enabling the wireless power transmitting mechanism 5 to establish the required electromagnetic energy transmission environment under conditions of high efficiency and high stability, and providing a stable magnetic coupling input for the wireless power receiving mechanism 6.

[0059] For example, the three-phase inverter 53 includes six (or 6n, where n is a positive integer) power switching devices, such as MOSFETs, IGBTs, or other power semiconductor devices suitable for high-frequency operation. The three-phase inverter 53 controls the switching sequence of each power switching device in a preset manner, causing the output of the DC power supply 54 to be inverted into a high-frequency three-phase alternating current (e.g., 85kHz) to drive the energy exchange process of the primary-side resonant mechanism 52 and excite the first three-phase electromagnetic coupling mechanism 51 to operate.

[0060] Optionally, as shown in Figures 5 and 6, the wireless power transmission system further includes a secondary resonant mechanism 62 and a three-phase rectifier 63; the wireless power transmitting mechanism 5 includes a second three-phase electromagnetic coupling mechanism 61, which, along with the secondary resonant mechanism 62 and the three-phase rectifier 63, are sequentially electrically connected. In this embodiment, the wireless power transmitting mechanism 5 includes a second three-phase electromagnetic coupling mechanism 61. Based on this, the wireless power transmission system further includes a secondary resonant mechanism 62 and a three-phase rectifier 63, which are sequentially electrically connected to convert the AC signal obtained by electromagnetic coupling on the receiving side into DC power usable by the corresponding load 7. Specifically, the second three-phase electromagnetic coupling mechanism 61 is used to induce a three-phase AC signal under the action of the magnetic field established by the wireless power transmitting mechanism 5. When the wireless power transmission system is working, the magnetic field generated on the transmitting side passes through the air gap to reach the receiving side. The second three-phase electromagnetic coupling mechanism 61 forms an induced voltage in its three-phase coils according to the change of the spatial magnetic field, thereby obtaining AC input. The secondary resonant mechanism 62 is electrically connected to the second three-phase electromagnetic coupling mechanism 61. Its structure may include a three-phase resonant capacitor, a three-phase resonant inductor, or other electrical components that can form a resonant network. This resonant mechanism is used to adjust the three-phase AC signal induced on the receiving side to the target frequency or amplitude range, so as to improve the utilization rate of magnetic field energy on the receiving side, reduce resonance loss, and improve the overall energy transfer efficiency. The three-phase signal output by the secondary resonant mechanism 62 is further input to the three-phase rectifier 63. The three-phase rectifier 63 may adopt a three-phase diode bridge, a three-phase synchronous rectifier module, or other rectifier circuits suitable for three-phase AC power conversion. This rectifier is responsible for rectifying the high-frequency three-phase AC signal output by the secondary resonant mechanism 62 into DC power, and can be connected to the downstream filter, energy storage device, or load 7 power supply circuit at its output terminal to achieve stable power supply to the load 7. Thus, through the aforementioned electrical connection, the receiving side of the wireless power transmission system can convert the energy transmitted by magnetic coupling into directly usable DC power, providing a complete receiving link for the wireless power transmission system; and the receiving side has functions such as resonant matching and rectification conversion, which can improve the energy receiving efficiency and transmission stability during the overall operation of the wireless power transmission system.

[0061] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A three-phase electromagnetic coupling mechanism, characterized in that, It includes a magnetic core layer (4) and an A-phase coil (1), a B-phase coil (2) and a C-phase coil (3) stacked on the magnetic core layer (4). The A-phase coil (1), the B-phase coil (2) and the C-phase coil (3) form a double-layer stacked structure. Each phase coil has coil segments disposed in different layers of the double-layer stacked structure. All the coil segments of each phase coil cover a 240° corresponding area along the circumference of the magnetic core layer (4).

2. The three-phase electromagnetic coupling mechanism as described in claim 1, characterized in that, The A-phase coil (1), the B-phase coil (2) and the C-phase coil (3) each include four electrically connected coil segments, each coil segment covering a 60° area along the circumference of the magnetic core layer (4); the two sets of coil segments of each phase coil are located in different layers of the double-layer stacked structure, and each set of coil segments includes two coil segments arranged opposite to each other.

3. The three-phase electromagnetic coupling mechanism as described in claim 2, characterized in that, The four coil segments of each phase coil have the same orthographic projection shape on the magnetic core layer (4) and are deflected by 90° in sequence.

4. The three-phase electromagnetic coupling mechanism as described in claim 2, characterized in that, The A-phase coil (1), B-phase coil (2) and C-phase coil (3) located on the same layer of the double-layer stacked structure have the same orthographic projection shape on the magnetic core layer (4), and are deflected by 60° in sequence.

5. The three-phase electromagnetic coupling mechanism as described in any one of claims 1-4, characterized in that, Each of the coil segments is fan-shaped.

6. The three-phase electromagnetic coupling mechanism as described in any one of claims 1-4, characterized in that, The orthographic projection of all the coil segments located in the first layer of the double-layer stacked structure onto the magnetic core layer (4) has the same shape as the orthographic projection of all the coil segments located in the second layer of the double-layer stacked structure onto the magnetic core layer (4), and is deflected by 30° relative to each other.

7. The three-phase electromagnetic coupling mechanism as described in any one of claims 1-4, characterized in that, The average distance from each phase coil to the magnetic core layer (4) is equal, and the average distance is the weighted average of the distances from the coil segments of the corresponding phase coils to the magnetic core layer (4) in each layer of the double-layer stacked structure.

8. A wireless power transmission system, characterized in that, It includes a wireless power transmitting mechanism (5) and a wireless power receiving mechanism (6), at least one of the wireless power transmitting mechanism (5) and the wireless power receiving mechanism (6) including a three-phase electromagnetic coupling mechanism as described in any one of claims 1-7.

9. The wireless power transmission system as described in claim 8, characterized in that, The wireless power transmitting mechanism (5) includes a first three-phase electromagnetic coupling mechanism (51), a primary-side resonant mechanism (52), a three-phase inverter (53), and a DC power supply (54), wherein the DC power supply (54), the three-phase inverter (53), the primary-side resonant mechanism (52), and the first three-phase electromagnetic coupling mechanism (51) are electrically connected in sequence.

10. The wireless power transmission system as described in claim 8, characterized in that, The wireless power transmitting mechanism (5) includes a second three-phase electromagnetic coupling mechanism (61), a secondary resonant mechanism (62), and a three-phase rectifier (63), which are electrically connected in sequence.

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