Three-phase symmetrical coupling inductor

Abstract

The utility model discloses a three-phase symmetrical coupling inductor which comprises a shell, and a first magnetic core is arranged in the shell. The second magnetic core is provided with a connecting middle column and three connecting side columns, one end of the connecting middle column is connected with the lower side of the first magnetic core, the other end of the connecting middle column is connected with the upper side of the second magnetic core, the connecting middle column is used for adjusting the inductive coupling coefficient, and the connecting side columns are used for adjusting the inductive coupling coefficient; one end of each connecting side column is connected with the first magnetic core, the other end of each connecting side column is connected with the second magnetic core, and coils are wound on the outer surfaces of the three connecting middle columns. According to the technical scheme of the embodiment, the three-phase winding inductors are symmetrically designed, so that the three-phase current ripples and the magnetic field of the coupling inductor are uniformly distributed.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic devices, in particular to a three-phase symmetric coupled inductor. Background Art

[0002] With the development of new energy technologies, the volume and mass of DC converters are fundamental to improving the power performance of fuel cell vehicles. However, in the existing technology of magnetic components of converters, the magnetic resistances of the three-phase windings cannot be made exactly the same, resulting in asymmetry of the three-phase winding inductances, and non-uniform distribution of the three-phase current ripples and magnetic fields. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a three-phase symmetric coupled inductor, which can make the three-phase windings of the inductor symmetrically distributed, the three-phase current ripples balanced, and the magnetic field uniformly distributed and concentrated.

[0004] On the one hand, the three-phase symmetric coupled inductor according to the embodiment of the utility model includes:

[0005] A housing, in which a first magnetic core is arranged;

[0006] A second magnetic core, which is provided with a connecting middle column and three connecting side columns. One end of the connecting middle column is connected to the lower side of the first magnetic core, and the other end of the connecting middle column is connected to the upper side of the second magnetic core. The connecting middle column is used to adjust the inductance coupling coefficient. One end of the connecting side column is connected to the first magnetic core, and the other ends of a plurality of the connecting side columns are all connected to the second magnetic core. Coils are wound around the outer surfaces of the three connecting middle columns.

[0007] According to some embodiments of the utility model, the outer shapes and dimensions of the three connecting side columns are the same, the structures of the three connecting side columns are staggered by 120° from each other, and the three connecting side columns are symmetrically arranged with respect to the first central axis of the connecting middle column.

[0008] According to some embodiments of the utility model, the first magnetic core is provided with three first protruding parts, and a first protrusion is arranged at a position away from the second central axis of the first magnetic core. The first protrusion is adapted to the shape of the connecting side column.

[0009] According to some embodiments of the present utility model, the housing is provided with a shielding aluminum shell and a bottom plate. The shielding aluminum shell is provided with three second protruding portions, which are adapted to the first magnetic core. The bottom plate is connected to the bottom of the second magnetic core and the coil. The bottom plate is provided with three third protruding portions. A third protrusion is provided on the third protruding portion away from the third central axis of the bottom plate, and the third protruding portion is designed in a rectangle.

[0010] According to some embodiments of the present utility model, each of the three third protrusions is provided with a first through hole and a second through hole. One end of the coil passes through the first through hole, and the other end of the coil passes through the second through hole.

[0011] According to some embodiments of the present utility model, the connecting middle column and the connecting side columns are both cylindrical.

[0012] According to some embodiments of the present utility model, the three connecting side columns and the first magnetic core are connected by epoxy glue.

[0013] According to some embodiments of the present utility model, an air gap is provided between the connecting middle column and the housing.

[0014] The three-phase symmetric coupled inductor according to the embodiments of the present utility model has at least the following beneficial effects:

[0015] A housing, in which a first magnetic core is provided; a second magnetic core, the second magnetic core is provided with a connecting middle column and three connecting side columns. One end of the connecting middle column is connected to the lower side of the first magnetic core, and the other end of the connecting middle column is connected to the upper side of the second magnetic core. The connecting middle column is used to adjust the inductance coupling coefficient. One end of the connecting side column is connected to the first magnetic core, and the other ends of the plurality of connecting side columns are all connected to the second magnetic core. Coils are wound around the outer surfaces of the three connecting middle columns. According to the technical solution of this embodiment, by symmetrically designing the three-phase winding inductance, the three-phase current ripple and magnetic field of the coupled inductor are evenly distributed.

[0016] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0018] Figure 1 is a schematic diagram of the overall structure of the three-phase symmetric coupled inductor according to the embodiment of the present utility model;

[0019] Figure 2Schematic diagram of the internal structure of the three-phase symmetric coupled inductor according to an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the bottom plate structure of the three-phase symmetric coupled inductor according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] Housing 100; first magnetic core 110; first protrusion 111; shielding aluminum shell 120; second protrusion 121; bottom plate 130; third protrusion 131; first through hole 132; second through hole 133; second magnetic core 200; connecting middle column 210; connecting side column 220. Detailed implementation manners

[0023] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0024] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two, "greater than", "less than", "exceeding", etc. are understood as not including the number itself, and "above", "below", "within", etc. are understood as including the number itself. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0026] Refer to Figures 1 to 3, this embodiment provides a three-phase symmetric coupled inductor, including a housing 100, within which a first magnetic core 110 is disposed; a second magnetic core 200, which is provided with a connecting middle column 210 and three connecting side columns 220. One end of the connecting middle column 210 is connected to the lower side of the first magnetic core 110, and the other end of the connecting middle column 210 is connected to the upper side of the second magnetic core 200. The connecting middle column 210 is used to adjust the inductance coupling coefficient. One end of each connecting side column 220 is connected to the first magnetic core 110, and the other ends of multiple connecting side columns 220 are all connected to the second magnetic core 200. Coils are wound around the outer surfaces of the three connecting middle columns 210. According to the technical solution of this embodiment, by symmetrically designing the three-phase winding inductors, the three-phase current ripple and magnetic field of the coupled inductor are evenly distributed.

[0027] It should be noted that by winding coils around the outer surfaces of the three middle columns, a three-phase winding is formed. The three-phase windings are symmetrically distributed and have the same magnetic resistance. The three-phase inductances are consistent, and the three-phase current ripples are balanced, which can effectively improve the interference of electromagnetic interference on electronic devices. In this embodiment, by connecting the first magnetic core 110 and the second magnetic core 200 in a symmetric manner through the three connecting side columns 220, the symmetry of the entire inductor structure in the three phases is ensured, thereby reducing the generation of unbalanced currents and harmonics and improving the overall operating efficiency and reliability of the inductor.

[0028] It should be noted that the first magnetic core 110 is an I-shaped magnetic core, and the second magnetic core 200 is an E-shaped magnetic core. By pairing the first magnetic core 110 and the second magnetic core 200, a complete closed magnetic circuit of the three-phase symmetric coupled inductor is formed. When adjusting the air gap, the adjustment of the air gap can be completed by adjusting the distance between the middle column of the magnetic core and the first magnetic core 110.

[0029] The external shapes and sizes of the three connecting side columns 220 are all the same. The structures of the three connecting side columns 220 are staggered by 120° from each other, and the three connecting side columns 220 are symmetrically arranged with respect to the first central axis of the connecting middle column 210. It should be noted that by staggering the structures of the connecting side columns 220 by 120° from each other to simulate the phase relationship of three-phase alternating current, the three-phase symmetry of the inductor in electrical performance is ensured. And the magnetic fields generated by each connecting side column 220 can balance each other, reducing unnecessary magnetic flux leakage and mutual interference, thereby improving the inductor energy conversion efficiency and reducing electromagnetic radiation. Further, the three connecting side columns 220 are symmetrically arranged with respect to the first central axis of the connecting middle column 210, which can enhance the stability of the entire inductor structure and improve the reliability of the inductor in a complex working environment. Since the external shapes and sizes of the three connecting side columns 220 are the same and the structures are symmetric, the three-phase symmetric coupled inductor can achieve higher precision and consistency in the manufacturing process, reduce the manufacturing cost, and improve the reliability and durability of the product.

[0030] The first magnetic core 110 is provided with three first protruding portions 111. A first protrusion is provided at a position away from the second central axis of the first magnetic core 110, and the first protrusion is adapted to the shape of the connecting side column 220. It should be noted that the close fit between the first protruding portion 111 and the connecting side column 220 can effectively improve the overall stability of the inductor structure. In this embodiment, the electromagnetic coupling effect of the three-phase symmetric coupled inductor can also be optimized by reducing the air gap and magnetic resistance between the magnetic core and the connecting side column 220, improving the electromagnetic performance of the inductor, increasing the inductance, reducing losses and reducing harmonics. In addition, the shape of the first protruding portion 111 is adapted to the connecting side column 220, which can simplify the assembly process of the inductor and improve the assembly efficiency.

[0031] The housing 100 is provided with a shielding aluminum shell 120 and a bottom plate 131. The shielding aluminum shell 120 is provided with three second protruding portions 121, and the second protruding portions 121 are adapted to the first magnetic core 110. The bottom plate 131 is connected to the bottom of the second magnetic core 200 and the coil. The bottom plate 131 is provided with three third protruding portions 131. A third protrusion is provided at a position away from the third central axis of the bottom plate 131, and the third protruding portion 131 is designed in a rectangle.

[0032] It should be noted that setting the shielding aluminum shell 120 can effectively reduce the influence of external electromagnetic interference on the internal circuit and components of the inductor, and improve the electromagnetic compatibility of the inductor; the second protruding portion 121 is adapted to the first magnetic core 110 to ensure close contact between the magnetic cores, further enhancing the electromagnetic shielding effect of the shielding aluminum shell 120 and reducing electromagnetic leakage and radiation; the second protruding portion 121 can increase the contact area and friction between the magnetic core and the housing 100, improving the stability and seismic resistance of the inductor structure. Further, the setting of the third protruding portion 131 increases the connection points between the bottom plate 131 and the second magnetic core 200 and the coil, improving the rigidity and strength of the inductor structure.

[0033] Each of the three third protrusions is provided with a first through hole 132 and a second through hole 133. One end of the coil passes through the first through hole 132, and the other end of the coil passes through the second through hole 133. It should be noted that by passing the two ends of the coil through the first through hole 132 and the second through hole 133 of the third protrusion respectively, the fixation of the coil in the inductor is realized, reducing the loosening or displacement of the coil under vibration or restart conditions, and ensuring the long-term stable operation of the inductor. Further, since the two ends of the coil pass through different through holes respectively, the current can be more evenly distributed when flowing through the coil, reducing the non-uniformity of the current density, thereby reducing the resistance loss and heat generation of the inductor.

[0034] Both the connecting middle column 210 and the connecting side column 220 are cylindrical. It should be noted that both the connecting middle column 210 and the connecting side column 220 are set to be cylindrical to ensure the uniform distribution and concentration of the magnetic field of the inductor, reducing the building magnetic flux of the inductor; and the winding process of the cylindrical magnetic column and the side column is simple, which is beneficial to the automated production of the inductor.

[0035] The three connecting side columns 220 are connected to the first magnetic core 110 through epoxy glue. It should be noted that the epoxy glue can firmly connect the connecting side column 220 and the first magnetic core 110 together. As an insulating material, the epoxy glue helps to reduce the electromagnetic interference and leakage between the first magnetic core 110 and the connecting side column 220. At the same time, the stable connection can reduce the resistance and loss caused by poor contact or looseness, further improving the electromagnetic performance of the inductor. Specifically, in this embodiment, the three coils are respectively wound around the three connecting side columns 220 of the second magnetic core 200, and epoxy glue is applied at the connection points between the connecting side columns 220 and the first magnetic core 110; the first magnetic core 110 is covered and ground, and the static inductance and leakage inductance of the three phases are tested. After the qualified leakage inductance is put into the oven to dry the epoxy glue, the inductor is then installed on the bottom plate 131.

[0036] An air gap is provided between the connecting middle column 210 and the housing 100. It should be noted that the air gap can change the distribution of the magnetic field of the inductor, making the magnetic flux pass more concentratedly through the connecting middle column 210, reducing the occurrence of magnetic leakage. At the same time, the electromagnetic coupling effect can also be optimized by adjusting the size of the air gap. In this embodiment, by grinding the connecting middle column 210, the relative distance between the connecting middle column 210 and the first magnetic core 110 is adjusted to complete the adjustment of the air gap, thereby optimizing the electromagnetic coupling of the inductor.

[0037] In the description of this specification, the descriptions referring to terms such as "one embodiment", "further embodiment", "some specific embodiments" or "some examples" etc. mean that the specific features, structures or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0038] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A three-phase symmetric coupled inductor, characterized in that, Comprising: A housing, within which a first magnetic core is provided; A second magnetic core, the second magnetic core is provided with a connecting middle column and three connecting side columns, one end of the connecting middle column is connected to the lower side of the first magnetic core, the other end of the connecting middle column is connected to the upper side of the second magnetic core, the connecting middle column is used to adjust the inductive coupling coefficient, the connecting middle column is used to adjust the inductive coupling coefficient, one end of the connecting side column is connected to the first magnetic core, and the other ends of multiple connecting side columns are all connected to the second magnetic core, and coils are wound around the outer surfaces of the three connecting middle columns.

2. The three-phase symmetric coupled inductor according to claim 1, characterized in that, The outer shapes and dimensions of the three connecting side columns are all the same, the structures of the three connecting side columns are staggered by 120° from each other, and the three connecting side columns are symmetrically arranged with respect to the first central axis of the connecting middle column.

3. The three-phase symmetrical coupled inductor according to claim 1, wherein The first magnetic core is provided with three first protruding parts, and a first protrusion is provided at a position away from the second central axis of the first magnetic core, and the first protrusion is adapted to the shape of the connecting side column.

4. The three-phase symmetrical coupled inductor according to claim 1, wherein The housing is provided with a shielding aluminum shell and a bottom plate, the shielding aluminum shell is provided with three second protruding parts, the second protruding parts are adapted to the first magnetic core, the bottom plate is connected to the bottom of the second magnetic core and the coil, the bottom plate is provided with three third protruding parts, and a third protrusion is provided at a position away from the third central axis of the bottom plate, and the third protruding parts are designed in a rectangular shape.

5. The three-phase symmetrical coupled inductor according to claim 4, characterized in that, Each of the three third protrusions is provided with a first through hole and a second through hole, one end of the coil passes through the first through hole, and the other end of the coil passes through the second through hole.

6. The three-phase symmetrical coupled inductor according to claim 1, characterized in that The connecting middle column and the connecting side column are both cylindrical.

7. The three-phase symmetric coupled inductor according to claim 1, characterized in that, The three connecting side columns and the first magnetic core are connected by epoxy glue.

8. The three-phase symmetrical coupled inductor according to claim 1, wherein An air gap is provided between the connecting middle column and the housing.

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