Inductor core structure, inductor and inverter

Abstract

The utility model discloses an inductor core body structure, an inductor and an inverter. The inductor core body structure comprises a first phase core body group, a first coupling column, a second phase core body group, a second coupling column and a third phase core body group which are sequentially distributed along a first direction, each of the three-phase core body groups comprises a core column and two yoke columns; in a second direction which is straight to the first direction, the two yoke columns are respectively positioned at two ends of the core column; the core column in the first-phase core body group is a first-phase core column, and the yoke column is a first-phase yoke column; the core column in the second-phase core body group is a second-phase core column, and the yoke column is a second-phase yoke column; the core column in the third-phase core body group is a third-phase core column, and the yoke column is a third-phase yoke column; the second-phase yoke column magnetic resistance is greater than the first-phase yoke column magnetic resistance, and the first-phase yoke column magnetic resistance is equal to the third-phase yoke column magnetic resistance; and / or, the magnetic resistance of the second-phase core column is greater than that of the first-phase core column, and the magnetic resistance of the first-phase core column is equal to that of the third-phase core column. The inductor core body structure is convenient for realizing equal magnetic resistance of three-phase magnetic circuits and realizing three-phase magnetic circuit balance of the inductor.

Description

Technical Field

[0001] The present application relates to the technical field of inverters, and more specifically, to an inductor core structure, an inductor, and an inverter. Background Art

[0002] A photovoltaic inverter is a power conversion device applied to a new energy power generation system, which can convert direct current into alternating current. A power inductor is one of the important components of an inverter circuit, and undertakes functions such as energy transfer, storage, and filtering. In existing inverters, magnetic integration inductor technology is gradually used for power inductors, and three separate inductors are made into a three-phase magnetic integrated inductor through magnetic integration to pursue higher power density and lower cost.

[0003] In a three-phase magnetic integrated inductor, the most typical structure is a three-phase five-column magnetic integrated inductor (three-phase five-column inductor). Through three core columns and two coupling columns, three independent inductors are integrated into a three-phase five-column inductor, and finally it is protected and cooled by potting with thermal conductive silicone in a metal shell with heat dissipation teeth.

[0004] However, in a three-phase five-column inductor, compared with the R phase and the T phase, the magnetic resistance of the S phase is smaller, resulting in inconsistent magnetic resistance of the three-phase magnetic circuit and unbalanced three-phase magnetic circuit.

[0005] In summary, how to design an inductor to improve the magnetic resistance consistency of the three-phase magnetic circuit and facilitate the realization of the three-phase magnetic circuit balance of the inductor is an urgent problem to be solved by those skilled in the art at present. Utility Model Content

[0006] In view of this, the purpose of the present application is to provide an inductor core structure, an inductor, and an inverter to improve the magnetic resistance consistency of the three-phase magnetic circuit and facilitate the realization of the three-phase magnetic circuit balance of the inductor.

[0007] To achieve the above object, the present application provides the following technical solutions:

[0008] An inductor core structure includes: a first-phase core body group, a first coupling column, a second-phase core body group, a second coupling column, and a third-phase core body group that are sequentially distributed along a first direction;

[0009] Wherein, the first-phase core body group, the second-phase core body group, and the third-phase core body group each include a core column and two yoke columns; in a second direction, the two yoke columns are respectively located at both ends of the core column; the second direction is perpendicular to the first direction;

[0010] In the first-phase core body group, the core column is a first-phase core column, and the yoke column is a first-phase yoke column; in the second-phase core body group, the core column is a second-phase core column, and the yoke column is a second-phase yoke column; in the third-phase core body group, the core column is a third-phase core column, and the yoke column is a third-phase yoke column;

[0011] The reluctance of the second phase yoke column is greater than that of the first phase yoke column, and the reluctance of the first phase yoke column is equal to that of the third phase yoke column; and / or, the reluctance of the second phase core column is greater than that of the first phase core column, and the reluctance of the first phase core column is equal to that of the third phase core column.

[0012] Optionally, the magnetic path length of the second phase yoke column is greater than that of the first phase yoke column, and the magnetic path length of the first phase yoke column is equal to that of the third phase yoke column; wherein, the magnetic path length direction of the yoke column is parallel to the first direction.

[0013] Optionally, the cross-sectional area of the second phase yoke column is smaller than that of the first phase yoke column, and the cross-sectional area of the first phase yoke column is equal to that of the third phase yoke column; wherein, the cross-sectional area of the yoke column is perpendicular to the first direction.

[0014] Optionally, at least part of the thickness of the second phase yoke column is smaller than that of the first phase yoke column, and the thickness of the first phase yoke column is equal to that of the third phase yoke column; wherein, the thickness direction of the yoke column is perpendicular to the first direction and the second direction.

[0015] Optionally, the second phase yoke column has an equal-thickness structure.

[0016] Optionally, the thickness of the second phase yoke column is 0.5 times that of the first phase yoke column.

[0017] Optionally, the second phase yoke column has a non-equal-thickness structure.

[0018] Optionally, in the first direction, both end portions of the second phase yoke column have an equal-thickness structure and are of equal thickness, and the thickness of the middle portion of the second phase yoke column is smaller than that of the end portions; the thicknesses of the two end portions of the second phase yoke column, the thickness of the first coupling column, and the thickness of the second coupling column are equal;

[0019] and / or, in the thickness direction of the second phase yoke column, the second phase yoke column is recessed from the first side to the second side and / or the second phase yoke column is recessed from the second side to the first side.

[0020] Optionally, the second phase yoke column has a symmetric structure, and the second phase yoke column is symmetric about a first symmetry plane and / or a second symmetry plane; wherein, the first symmetry plane is parallel to the first direction, or the second symmetry plane is parallel to the thickness direction of the second phase yoke column.

[0021] Optionally, the width of at least a part of the second yoke post is less than the width of the first yoke post, and the width of the first yoke post is equal to the width of the third yoke post; wherein, the width direction of the yoke post is the second direction.

[0022] Optionally, the second yoke post has a constant-width structure.

[0023] Optionally, the width of the second yoke post is 0.5 times the width of the first yoke post.

[0024] Optionally, the second yoke post has a non-constant-width structure.

[0025] Optionally, in the first direction, both ends of the second yoke post have a constant-width structure and are equal in width, and the width of the middle part of the second yoke post is less than the width of the ends; the widths of both ends of the second yoke post, the width of the first coupling post, and the width of the second coupling post are equal;

[0026] And / or, in the second direction, the first side of the second yoke post is recessed towards the second side, and the second side of the second yoke post is close to the second yoke core post;

[0027] And / or, the second yoke post is a symmetric structure, and the symmetry plane of the second yoke post is parallel to the second direction.

[0028] Optionally, the magnetic permeability of the second yoke post is less than the magnetic permeability of the first yoke post, and the magnetic permeability of the first yoke post is equal to the magnetic permeability of the third yoke post;

[0029] And / or, the magnetic permeability of the second yoke core post is less than the magnetic permeability of the first yoke core post, and the magnetic permeability of the first yoke core post is equal to the magnetic permeability of the third yoke core post.

[0030] Optionally, the second yoke post includes a first air gap.

[0031] Optionally, the first air gaps are distributed at both ends of the second yoke post in the first direction, and the first air gaps are in contact with the corresponding coupling posts.

[0032] Optionally, the material of the second yoke post is different from the material of the first yoke post, and the material of the first yoke post is the same as the material of the third yoke post.

[0033] Optionally, in the second yoke core group, the yoke core post includes a second air gap.

[0034] Optionally, the material of the second yoke core post is different from the material of the first yoke core post, and the material of the first yoke core post is the same as the material of the third yoke core post.

[0035] Based on the inductance core structure provided above, the present application further provides an inductor, which includes: an inductor housing, and an inductor body located within the inductor housing; the inductor body includes: a winding, and the inductance core structure described in any one of the above; wherein, the winding includes a first winding, a second winding, and a third winding, the first winding is sleeved on the first-phase core column, the second winding is sleeved on the second-phase core column, and the third winding is sleeved on the third-phase core column.

[0036] Optionally, the inductor housing is a heat dissipation housing;

[0037] Wherein, the inductor housing includes a first internal heat dissipation portion and a second internal heat dissipation portion, the first internal heat dissipation portion is located between the second winding and the first coupling column, and the second internal heat dissipation portion is located between the second winding and the second coupling column;

[0038] And / or, the inductor housing includes a third internal heat dissipation portion and a fourth internal heat dissipation portion, the third internal heat dissipation portion is located between the first winding and the first coupling column, and the fourth internal heat dissipation portion is located between the third winding and the second coupling column;

[0039] And / or, when the cross-sectional area of the second-phase yoke column is smaller than the cross-sectional area of the first-phase yoke column, and the cross-sectional area of the first-phase yoke column is equal to the cross-sectional area of the third-phase yoke column: the inductor housing includes a yoke column placement cavity; in the yoke column placement cavity, there is an adaptation structure at the position corresponding to the second-phase yoke column, the adaptation structure is adapted to the second-phase yoke column, and the adaptation structure is a heat dissipation structure.

[0040] Based on the inductor provided above, the present application further provides an inverter, which includes the inductor described in any one of the above.

[0041] In the inductance core structure provided by the present application, on the one hand, the magnetic resistance of the second-phase yoke column is greater than that of the first-phase yoke column, and the magnetic resistance of the first-phase yoke column is equal to the magnetic resistance of the third-phase yoke column. In this way, the magnetic resistance of the second-phase core group can be increased, the magnetic resistance consistency of the three-phase magnetic circuit can be improved, so as to facilitate the realization of equal magnetic resistance of the three-phase magnetic circuit, and further facilitate the realization of the three-phase magnetic circuit balance of the inductor; on the other hand, the magnetic resistance of the second-phase core column is greater than that of the first-phase core column, and the magnetic resistance of the first-phase core column is equal to the magnetic resistance of the third-phase core column. In this way, the magnetic resistance of the second-phase core group can be increased, the magnetic resistance consistency of the three-phase magnetic circuit can be improved, so as to facilitate the realization of equal magnetic resistance of the three-phase magnetic circuit, and further facilitate the realization of the three-phase magnetic circuit balance of the inductor.

[0042] The above two aspects can be combined to further increase the magnetic resistance of the second-phase core group, improve the magnetic resistance consistency of the three-phase magnetic circuit, so as to facilitate the realization of equal magnetic resistance of the three-phase magnetic circuit, and further facilitate the realization of the three-phase magnetic circuit balance of the inductor.

[0043] Therefore, the inductance core structure provided by this application increases the magnetic resistance of the second-phase core group, improves the consistency of the magnetic resistance of the three-phase magnetic circuit, facilitates the achievement of equal magnetic resistance in the three-phase magnetic circuit, and thus facilitates the achievement of three-phase magnetic circuit balance of the inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0045] Figure 1 FIG. 10 is a schematic structural diagram of an inductor body in an inductor provided by the prior art;

[0046] Figure 2 FIG. 14 is Figure 1 a schematic diagram of an equivalent magnetic circuit of the inductor core structure in FIG. 16;

[0047] Figure 3 FIG. 20 is a schematic structural diagram of an inductor provided by the prior art;

[0048] Figure 4 FIG. 24 is a schematic structural diagram of an inductor core structure provided by Embodiment 1 of this application;

[0049] Figure 5 FIG. 28 is a schematic diagram of an equivalent magnetic circuit of the inductor core structure provided by Embodiment 1 of this application;

[0050] Figure 6 FIG. 32 is a schematic structural diagram of an inductor body in an inductor provided by Embodiment 1 of this application;

[0051] Figure 7 FIG. 36 is a schematic structural diagram of an inductor provided by Embodiment 1 of this application;

[0052] Figure 8 FIG. 40 is a cross-sectional view of an inductor provided by Embodiment 1 of this application;

[0053] Figure 9 FIG. 44 is a schematic structural diagram of an inductor housing in an inductor provided by Embodiment 1 of this application;

[0054] Figure 10 FIG. 48 is a partial schematic structural diagram of an inductor housing in an inductor provided by Embodiment 1 of this application;

[0055] Figure 11 FIG. 52 is a schematic structural diagram of an inductor body in an inductor provided by Embodiment 2 of this application;

[0056] Figure 12Another structural schematic diagram of the inductor body in the inductor provided in the second embodiment of the present application;

[0057] Figure 13 Partial structural schematic diagram of the inductor housing in the inductor provided in the second embodiment of the present application;

[0058] Figure 14 For Figure 13 Front view of the structure shown;

[0059] Figure 15 One structural schematic diagram of the inductor body in the inductor provided in the third embodiment of the present application;

[0060] Figure 16 Another structural schematic diagram of the inductor body in the inductor provided in the third embodiment of the present application;

[0061] Figure 17 Structural schematic diagram of the inductor housing in the inductor provided in the third embodiment of the present application;

[0062] Figure 18 Structural schematic diagram of the inductor core structure provided in the third embodiment of the present application;

[0063] Figure 19 Schematic diagram of the equivalent magnetic circuit of the inductor core structure provided in the third embodiment of the present application;

[0064] Figure 20 Structural schematic diagram of the inductor body in the inductor provided in the third embodiment of the present application;

[0065] Figure 21 Partial structural schematic diagram of the inverter provided in the embodiment of the present application.

[0066] Explanation of reference numerals:

[0067] 011 is the R-phase core column, 012 is the S-phase core column, 013 is the T-phase core column, 021 is the first coupling column, 022 is the second coupling column, 03 is the yoke column, 041 is the R-phase inner window, 042 is the S-phase inner window, 043 is the T-phase inner window, 051 is the R-phase winding, 052 is the S-phase winding, 053 is the T-phase winding, 06 is the inductor housing;

[0068] 100 is the inductor core structure, 10 is the R-phase core group, 20 is the S-phase core group, 30 is the T-phase core group, 111 is the R-phase core column, 112 is the S-phase core column, 113 is the T-phase core column, 121 is the first coupling column, 122 is the second coupling column, 131 is the R-phase yoke column, 132 is the S-phase yoke column, 133 is the T-phase yoke column, 134 is the recessed part, 141 is the R-phase inner window, 142 is the S-phase inner window, 143 is the T-phase inner window, 150 is the first air gap;

[0069] 210 is the R-phase winding, 220 is the S-phase winding, and 230 is the T-phase winding;

[0070] 300 is the inductor housing, 311 is the R-phase placement cavity, 312 is the S-phase placement cavity, 313 is the T-phase placement cavity, 321 is the first coupling post placement cavity, 322 is the second coupling post placement cavity, 331 is the first yoke post placement cavity, 332 is the second yoke post placement cavity, 340 is the heat dissipation tooth, 351 is the first internal heat dissipation part, 352 is the second internal heat dissipation part, 3311 is the first adaptation structure, and 3321 is the second adaptation structure. Detailed implementation manners

[0071] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0072] Next, the technical solutions in the embodiments of the present application will be clearly and completely described. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and claims of the present application, the singular forms "a", "an", "the", "above", "said", "this" are also intended to include, for example, the expression form of "one or more", unless there is a clear indication to the contrary in the context. It should also be understood that in the embodiments of the present application, "one or more" means one, two or more than two; " / ", describing the association relationship of associated objects, indicates that three relationships can exist; for example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0073] The reference to "one embodiment" or "some embodiments" etc. described in this specification means that specific features, structures or characteristics described in conjunction with the embodiment are included in one or more embodiments of the present application. Thus, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0074] The "multiple" involved in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, terms such as "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0075] The "parallel" and "perpendicular" involved in the present application are "substantially parallel" and "substantially perpendicular" in actual operations. "Substantially parallel" can be understood as parallel with a certain error. Similarly, "substantially perpendicular" can be understood as perpendicular with a certain error.

[0076] The "plane" involved in the present application is a "plane substantially parallel to the horizontal plane" in actual operations.

[0077] The "magnetic resistance" involved in the present application is the equivalent magnetic resistance in the equivalent magnetic circuit of an inductor (inductor core structure); the "magnetic permeability" involved in the present application is the equivalent magnetic permeability in the equivalent magnetic circuit of an inductor (inductor core structure).

[0078] Figure 1 It is a schematic structural diagram of the inductor body in an existing inductor. As Figure 1 shown, the inductor body of the inductor mainly includes an inductor core structure and a winding. Among them, the inductor core structure includes three core columns, two coupling columns, and two yoke columns 03. The three core columns are respectively an R-phase core column 011, an S-phase core column 012, and a T-phase core column 013. The two coupling columns are respectively a first coupling column 021 and a second coupling column 022. Among them, the R-phase core column 011, the first coupling column 021, the S-phase core column 012, the second coupling column 022, and the T-phase core column 013 are arranged in sequence; one yoke column 03 is located at one end of the three core columns, and the other yoke column 03 is located at the other end of the three core columns.

[0079] In the inductor core structure, there is a gap between the core column and the coupling column, and this gap can be called the inner window. There are four such inner windows, and the sizes of the four inner windows are the same. The four inner windows are respectively an R-phase inner window 041, two S-phase inner windows 042, and a T-phase inner window 043.

[0080] In the inductor core structure, the magnetic resistances of the three core columns are equal and are all R 1 , and the magnetic permeabilities of the three core columns are equal and are all μ 1 , the magnetic resistances of the two coupling columns are equal and are all R 2 , and the magnetic permeabilities of the two coupling columns are equal and are all μ 2 , the magnetic resistances of the partial yoke columns corresponding to each inner window are equal and are all R 3 , and the magnetic permeabilities of the partial yoke columns corresponding to each inner window are equal and are all μ 3 . Among them, μ 2 is much greater than μ 1 , μ2 much greater than μ 3 , for example, μ 1 ≤ 125, μ 2 = 2000, μ 3 ≤ 125.

[0081] Figure 2 is a schematic diagram of the equivalent magnetic circuit of the inductor core structure. According to Figure 2 the shown equivalent magnetic circuit, since μ 2 is much greater than μ 1 , μ 2 is much greater than μ 3 , the magnetic resistance R 2 of the coupling column can be equivalently regarded as zero. It can be understood that the coupling column will magnetically short-circuit the magnetic circuits of the R, S, and T phases, making the magnetic resistance R R of the R phase and the magnetic resistance R T of the T phase equal, and R R = R T = R 1 + 2R 3 ; the magnetic resistance R S of the S phase = R 1 + 2R 3 / 2 = R 1 + R 3 . Therefore, the magnetic resistances of the R, S, and T phases are inconsistent, resulting in an unbalanced magnetic circuit of the three-phase five-column inductor, poor inductance consistency of the three phases, inconsistent inductor current characteristics, and thus more difficult inverter control and poorer output consistency of the inverter.

[0082] In the inductor, there are three windings, namely the R-phase winding 051, the S-phase winding 052, and the T-phase winding 053. The R-phase winding 051 is sleeved on the R-phase core column 011, the S-phase winding 052 is sleeved on the S-phase core column 012, and the T-phase winding 053 is sleeved on the T-phase core column 013.

[0083] Figure 3 is a schematic diagram of the structure of the existing inductor. As Figure 3 shown, the contact area between the R-phase winding 051 and the heat dissipation housing 06 and the contact area between the T-phase winding 053 and the heat dissipation housing 06 are both larger than the contact area between the S-phase winding 052 and the heat dissipation housing 06. The heat conduction distance from the R-phase winding 051 to the heat dissipation housing 06 and the heat conduction distance from the T-phase winding 053 to the heat dissipation housing 06 are both smaller than the heat conduction distance from the S-phase winding 052 to the heat dissipation housing 06, resulting in a significantly weaker heat dissipation ability of the S phase than that of the R phase and the T phase, causing unbalanced three-phase heat dissipation and inconsistent three-phase temperatures (the S-phase temperature rise is too high), affecting the maximum operating temperature of the three-phase five-column inductor and being prone to adverse consequences such as winding thermal resistance deviation, uneven current, and increased loss.

[0084] To solve the above problems, an inductor core structure, an inductor, and an inverter are provided in an embodiment of the present application. By increasing the S-phase magnetic reluctance of the S-phase magnetic path, the magnetic reluctance consistency of the R, S, and T-phase magnetic paths is improved, facilitating the achievement of the three-phase magnetic path balance of the inductor.

[0085] As Figure 4 , Figure 15 and Figure 18 shown, the inductor core structure 100 provided in an embodiment of the present application includes: an R-phase core group 10, a first coupling column 121, an S-phase core group 20, a second coupling column 122, and a T-phase core group 30 that are sequentially distributed along a first direction.

[0086] It should be noted that the R, S, and T phases can also be represented by other letters, such as the A, B, and C phases, etc. The embodiment of the present application does not limit this. The R-phase core group 10 can be understood as a form of the first-phase core group, the S-phase core group 20 can be understood as a form of the second-phase core group, and the T-phase core group 30 can be understood as a form of the third-phase core group.

[0087] The R-phase core group 10, the S-phase core group 20, and the T-phase core group 30 each include a core column and two yoke columns. In a second direction perpendicular to the first direction, the two yoke columns are respectively located at both ends of the core column.

[0088] For ease of subsequent description, the core column in the R-phase core group 10 can be referred to as the R-phase core column 111, and the yoke column in the R-phase core group 10 can be referred to as the R-phase yoke column 131; the core column in the S-phase core group 20 can be referred to as the S-phase core column 112, and the yoke column in the S-phase core group 20 can be referred to as the S-phase yoke column 132; the core column in the T-phase core group 30 can be referred to as the T-phase core column 113, and the yoke column in the T-phase core group can be referred to as the T-phase yoke column 133. The first coupling column 121 and the second coupling column 122 can both be referred to as coupling columns. Among them, the R-phase core column 111, the first coupling column 121, the S-phase core column 112, the second coupling column 122, and the T-phase core column 113 are sequentially distributed along the first direction.

[0089] It should be noted that the R-phase core column 111 can be understood as a form of the first-phase core column, and the R-phase yoke column 131 can be understood as a form of the first-phase yoke column; the S-phase core column 112 can be understood as a form of the second-phase core column, and the S-phase yoke column 132 can be understood as a form of the second-phase yoke column; the T-phase core column 113 can be understood as a form of the third-phase core column, and the T-phase yoke column 133 can be understood as a form of the third-phase yoke column.

[0090] In actual situations, the magnetic permeabilities of the first coupling column 121 and the second coupling column 122 are both greater than those of the R-phase core column 111, the S-phase core column 112, and the T-phase core column 113, and the magnetic permeabilities of the first coupling column 121 and the second coupling column 122 are also both greater than those of the R-phase yoke column 131, the S-phase yoke column 132, and the T-phase yoke column 133. In this way, in the equivalent magnetic circuit of the inductor core structure 100, the coupling columns short-circuit the R-phase magnetic circuit, the S-phase magnetic circuit, and the T-phase magnetic circuit magnetically.

[0091] In actual situations, both the core column and the yoke column can adopt low-magnetic-permeability materials, and the coupling column can adopt high-magnetic-permeability materials to ensure that in the equivalent magnetic circuit of the inductor core structure 100, the coupling column magnetically short-circuits the R-phase magnetic circuit, the S-phase magnetic circuit, and the T-phase magnetic circuit.

[0092] Exemplarily, both the core column and the yoke column can be low-magnetic-permeability powder core materials with distributed air gaps, such as iron-silicon, iron-silicon-aluminum, or iron-nickel, etc. Both the core column and the yoke column can also be high-magnetic-permeability materials with air gaps. After adding air gaps, the high-magnetic-permeability materials will also be equivalent to low-magnetic-permeability materials. The high-magnetic-permeability materials can be amorphous, nanocrystalline, ferrite, or silicon steel sheets, etc. Therefore, it can be understood that: the equivalent magnetic permeabilities of the core column and the yoke column are relatively low, the equivalent magnetic permeability of the core column is lower than that of the coupling column, and the equivalent magnetic permeability of the yoke column is lower than that of the coupling column. The coupling column is a high-magnetic-permeability material, and the high-magnetic-permeability materials can be ferrite, amorphous, or nanocrystalline, etc.

[0093] The cross-section of the core column (perpendicular to the magnetic circuit inside the core column) can be circular, racetrack-shaped, rectangular, polygonal, or rounded polygonal (such as rounded rectangular), etc. The shape of the cross-section of the yoke column (perpendicular to the magnetic circuit inside the yoke column) can be the same as or different from that of the core column. For example, the cross-section of the core column is racetrack-shaped, and the cross-section of the yoke column is rectangular.

[0094] It should be noted that the racetrack shape can be understood as: being enclosed by two parallel straight lines and two arcs, one arc connecting one end of the two straight lines, and the other arc connecting the other end of the two straight lines, and the arcs protruding away from the straight lines.

[0095] In order to increase the S-phase magnetic resistance of the S-phase magnetic circuit to improve the magnetic resistance consistency of the R, S, and T three-phase magnetic circuits, on the one hand, it can be selected that the magnetic resistance of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131, and the magnetic resistance of the T-phase yoke column 133 is equal to that of the R-phase yoke column 131. In this way, the magnetic resistance of the S-phase core body group 20 can be increased, the magnetic resistance consistency of the three-phase magnetic circuits is improved, it is convenient to achieve equal magnetic resistances of the three-phase magnetic circuits, and thus it is convenient to achieve the three-phase magnetic circuit balance of the inductor.

[0096] It should be noted that in the S-phase core group 20, the magnetic reluctances of the two S-phase yoke columns 132 are equal; in the T-phase core group 30, the magnetic reluctances of the two T-phase yoke columns 133 are equal; in the R-phase core group 10, the magnetic reluctances of the two R-phase yoke columns 131 are equal.

[0097] In the above-mentioned one aspect, the magnetic reluctance of the S-phase core column 112 can be selected to be greater than, equal to, or less than the magnetic reluctance of the R-phase core column 111, and the magnetic reluctance of the T-phase core column 113 is equal to the magnetic reluctance of the R-phase core column 111. In actual situations, by adjusting the magnetic reluctance of the S-phase yoke column 132, it is only necessary to ensure that the magnetic reluctance consistency of the R-phase magnetic circuit, S-phase magnetic circuit, and T-phase magnetic circuit can be improved.

[0098] In order to increase the S-phase magnetic reluctance of the S-phase magnetic circuit, in another aspect, the magnetic reluctance of the S-phase core column 112 can be selected to be greater than the magnetic reluctance of the R-phase core column 111, and the magnetic reluctance of the T-phase core column 113 is equal to the magnetic reluctance of the R-phase core column 111. In this way, the magnetic reluctance of the S-phase core group 20 can be increased, the magnetic reluctance consistency of the three-phase magnetic circuit is improved, it is convenient to make the magnetic reluctances of the three-phase magnetic circuits equal, and thus it is convenient to achieve the three-phase magnetic circuit balance of the inductor.

[0099] In the above-mentioned another aspect, the magnetic reluctance of the S-phase yoke column 132 can be selected to be greater than, less than, or equal to the magnetic reluctance of the R-phase yoke column 131, and the magnetic reluctance of the T-phase yoke column 133 is equal to the magnetic reluctance of the R-phase yoke column 131. In actual situations, by adjusting the magnetic reluctance of the S-phase core column 112, it is only necessary to ensure that the magnetic reluctance consistency of the R-phase magnetic circuit, S-phase magnetic circuit, and T-phase magnetic circuit can be improved.

[0100] The above two aspects can be combined to further increase the magnetic reluctance of the S-phase core group 20. It can be understood that the magnetic reluctance of the S-phase magnetic circuit is further increased, the magnetic reluctance consistency of the three-phase magnetic circuit is further improved, it is convenient to make the magnetic reluctances of the three-phase magnetic circuits equal, and thus it is convenient to achieve the three-phase magnetic circuit balance of the inductor.

[0101] Therefore, the inductor core structure 100 provided by the embodiment of the present application can increase the magnetic reluctance of the S-phase core group 20, improve the magnetic reluctance consistency of the three-phase magnetic circuit, facilitate the equality of the magnetic reluctances of the three-phase magnetic circuits, thereby facilitating the three-phase magnetic circuit balance of the inductor, and further improving the inductance consistency and inductor current characteristics of the three phases, facilitating the control of the inverter, and also facilitating the improvement of the output consistency of the inverter.

[0102] It should be noted that the S-phase magnetic reluctance of the S-phase magnetic circuit is affected by the magnetic reluctance of the S-phase yoke column 132, and the S-phase magnetic reluctance of the S-phase magnetic circuit is positively correlated with the magnetic reluctance of the S-phase yoke column 132; the S-phase magnetic reluctance of the S-phase magnetic circuit is also affected by the magnetic reluctance of the S-phase core column 112, and the S-phase magnetic reluctance of the S-phase magnetic circuit is positively correlated with the magnetic reluctance of the S-phase core column 112.

[0103] In the equivalent magnetic circuit, the magnetic reluctance formula is:

[0104]

[0105] Among them, l is the magnetic path length, μ is the magnetic permeability, and μ 0 is the magnetic permeability of vacuum, and A C is the cross-section of the magnetic path.

[0106] According to the above magnetic resistance formula, the magnetic resistance of the S-phase yoke column 132 can be increased by increasing the magnetic path length of the S-phase yoke column 132, and / or decreasing the magnetic permeability of the S-phase yoke column 132, and / or decreasing the magnetic path area of the S-phase yoke column 132, so as to achieve that the magnetic resistance of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131.

[0107] Based on the above, on the one hand, as Figure 4 shown, it can be selected that the magnetic path length of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131, and the magnetic path length of the T-phase yoke column 133 is equal to that of the R-phase yoke column 131; among them, the magnetic path length direction of the yoke column is parallel to the first direction. In this way, by increasing the magnetic path length of the S-phase yoke column 132, the magnetic resistance of the S-phase yoke column 132 can be increased, so as to achieve that the magnetic resistance of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131, which is convenient for operation and also convenient for manufacturing the S-phase yoke column 132 and the inductor.

[0108] On the other hand, as Figure 11 , Figure 12 and Figure 15 shown, it can be selected that the cross-sectional area of the S-phase yoke column 132 is smaller than that of the R-phase yoke column 131, and the cross-sectional area of the T-phase yoke column 133 is equal to that of the R-phase yoke column 131; among them, the cross-sectional area of the yoke column is perpendicular to the first direction. It should be noted that the above cross-sectional areas are all the areas of the magnetic path cross-sections of the yoke columns. In this way, by decreasing the cross-sectional area of the S-phase yoke column 132, the magnetic resistance of the S-phase yoke column 132 can be increased, so as to achieve that the magnetic resistance of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131, which is convenient for operation and also convenient for manufacturing the S-phase yoke column 132 and the inductor.

[0109] On the other hand, it can be selected that the magnetic permeability of the S-phase yoke column 132 is smaller than that of the R-phase yoke column 131, and the magnetic permeability of the T-phase yoke column 133 is equal to that of the R-phase yoke column 131. In this way, by decreasing the magnetic permeability of the S-phase yoke column 132, the magnetic resistance of the S-phase yoke column 132 can be increased, so as to achieve that the magnetic resistance of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131, which is convenient for operation and convenient for manufacturing the inductor.

[0110] The above three aspects can be combined arbitrarily or implemented separately, and the embodiments of the present application do not make any limitations in this regard.

[0111] According to the above magnetoresistance formula, the magnetoresistance of the S-phase core column 112 can be increased by increasing the magnetic path length of the S-phase core column 112, and / or decreasing the magnetic permeability of the S-phase core column 112, and / or decreasing the magnetic path area of the S-phase core column 112, so as to make the magnetoresistance of the S-phase core column 112 greater than that of the R-phase core column 111.

[0112] In actual situations, generally, the magnetic path lengths of the S-phase core column 112, the R-phase core column 111, and the T-phase core column 113 are equal, and the magnetic path areas of the S-phase core column 112, the R-phase core column 111, and the T-phase core column 113 are equal. If the magnetic path length and magnetic path area of the S-phase core column 112 are changed, it will affect the overall assembly of the inductor, increase the size of the inductor, make the overall shape of the inductor irregular, increase the manufacturing difficulty of the inductor, and affect the inductor performance. To facilitate making the magnetoresistance of the S-phase core column 112 greater than that of the R-phase core column 111, the magnetic permeability of the S-phase core column 112 can be selected to be decreased. In some embodiments, the magnetic permeability of the S-phase core column 112 is less than that of the R-phase core column 111, and the magnetic permeability of the T-phase core column 113 is equal to that of the R-phase core column 111. In this way, by decreasing the magnetic permeability of the S-phase core column 112, the magnetoresistance of the S-phase core column 112 can be increased, the magnetoresistance of the S-phase core column 112 can be made greater than that of the R-phase core column 111, which is convenient for operation and manufacturing of the inductor.

[0113] The following uses different embodiments to illustrate the inductor core structure and inductor provided by the embodiments of the present application.

[0114] Embodiment 1 of the present application

[0115] In Embodiment 1 of the present application, by increasing the magnetic path length of the S-phase yoke column, the magnetoresistance of the S-phase yoke column is increased, thereby increasing the S-phase magnetoresistance, and the magnetoresistances of the three-phase magnetic paths can be made consistent.

[0116] As Figure 4 shown, the inductor core structure 100 provided in Embodiment 1 of the present application includes: an R-phase core body group 10, a first coupling column 121, an S-phase core body group 20, a second coupling column 122, and a T-phase core body group 30 that are sequentially distributed along a first direction; wherein, the R-phase core body group 10, the S-phase core body group 20, and the T-phase core body group 30 each include a core column and two yoke columns. In a second direction, the two yoke columns are respectively located at both ends of the core column; the second direction is perpendicular to the first direction. The description of this part can refer to the foregoing text and will not be elaborated here.

[0117] In Embodiment 1 of the present application, the magnetic path length of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131, and the magnetic path length of the T-phase yoke column 133 is equal to that of the R-phase yoke column 131; wherein, the magnetic path length directions of the R-phase yoke column 131, the S-phase yoke column 132, and the T-phase yoke column 133 are all parallel to the first direction.

[0118] It should be noted that the magnetic path length of the R-phase yoke column 131 can be understood as the width of the inner window 141 in the R-phase, and the width of the inner window 141 in the R-phase is a R ; the magnetic path length of the S-phase yoke column 132 can be understood as the width of the inner window 142 in the S-phase, and the width of the inner window 142 in the S-phase is a S ; the magnetic path length of the T-phase yoke column 133 can be understood as the width of the inner window 143 in the T-phase, and the width of the inner window 143 in the T-phase is a T . Based on this, a S > a R , a R = a T . Among them, a S - a R = x, and x > 0.

[0119] When the magnetic path length of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131, compared with the prior art, the magnetic path length of the S-phase yoke column 132 is increased. According to the above magnetic resistance formula, the magnetic resistance of the S-phase yoke column 132 is increased, thereby increasing the magnetic resistance of the S-phase magnetic path. In this case, by adjusting the magnetic path length of the S-phase yoke column 132, the magnetic resistances of the R-phase magnetic path, the S-phase magnetic path, and the T-phase magnetic path can be made equal, that is, R R = R S = R T , where R R is the magnetic resistance of the R-phase magnetic path, R S is the magnetic resistance of the S-phase magnetic path, and R T is the magnetic resistance of the T-phase magnetic path.

[0120] According to the above magnetic resistance formula, the magnetic resistance of the S-phase yoke column 132 is also affected by the magnetic permeability. In the first embodiment of the present application, in order to effectively increase the magnetic resistance of the S-phase yoke column 132, the magnetic permeability of the S-phase yoke column 132 is less than or equal to the magnetic permeability of the R-phase yoke column 131, and the magnetic permeability of the T-phase yoke column 133 is equal to the magnetic permeability of the R-phase yoke column 131, that is, μ 3-1 ≤ μ 1 , μ 3-1 is the magnetic permeability of the S-phase yoke column 132, and μ 3 is the magnetic permeability of the T-phase yoke column 132 and the magnetic permeability of the R-phase yoke column 131. Compared with the prior art, the magnetic permeability of the S-phase yoke column 132 is reduced. According to the above magnetic resistance formula, the magnetic resistance of the S-phase yoke column 132 is increased, thereby increasing the magnetic resistance of the S-phase magnetic path. In this case, by adjusting the magnetic path length and magnetic permeability of the S-phase yoke column 132, the magnetic resistances of the R-phase magnetic path, the S-phase magnetic path, and the T-phase magnetic path can be made equal, that is, R R = R S = R T .

[0121] There are various ways to achieve that the magnetic permeability of the S-phase yoke column 132 is less than or equal to that of the R-phase yoke column 131. Refer to the foregoing content. Embodiment 1 of this application does not limit this.

[0122] In actual situations, it is also possible to choose that the magnetic permeability of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131, as long as it is ensured that the magnetic resistance of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131.

[0123] As described above, the magnetic resistance of the S-phase magnetic circuit is also affected by the magnetic resistance of the S-phase core column 112. In Embodiment 1 of this application, in order to effectively increase the magnetic resistance of the S-phase magnetic circuit, it is possible to choose that the magnetic permeability of the S-phase core column 112 is less than or equal to that of the R-phase core column 111, and the magnetic permeability of the T-phase core column 113 is equal to that of the R-phase core column 111, that is, μ 1-1 ≤μ 1 ,μ 1-1 is the magnetic permeability of the S-phase yoke column 132, and μ 1 is the magnetic permeability of the T-phase yoke column 132 and the magnetic permeability of the R-phase yoke column 131. Compared with the prior art, the magnetic permeability of the S-phase core column 112 is reduced. From the above magnetic resistance formula, it can be seen that the magnetic resistance of the S-phase core column 112 is increased, thereby increasing the magnetic resistance of the S-phase magnetic circuit. In this case, by adjusting the magnetic circuit length and magnetic permeability of the S-phase yoke column 132, and adjusting the magnetic permeability of the S-phase core column 112, it is possible to make the magnetic resistances of the R-phase magnetic circuit, the S-phase magnetic circuit, and the T-phase magnetic circuit equal, that is, R R =R S =R T .

[0124] There are various ways to achieve that the magnetic permeability of the S-phase core column 112 is less than or equal to that of the R-phase core column 111. Refer to the foregoing content. Embodiment 1 of this application does not limit this.

[0125] In actual situations, it is also possible to choose that the magnetic permeability of the S-phase core column 112 is greater than that of the R-phase core column 112, as long as it is ensured that the magnetic resistance of the S-phase core column 112 is greater than that of the R-phase core column 112.

[0126] In Embodiment 1 of this application, it is possible to choose that the magnetic circuit length of the S-phase yoke column 132 is greater than that of the R-phase yoke column 131, and the magnetic circuit length of the T-phase yoke column 133 is equal to that of the R-phase yoke column 131; the magnetic permeability of the S-phase yoke column 132 is less than that of the R-phase yoke column 131, and the magnetic permeability of the T-phase yoke column 133 is equal to that of the R-phase yoke column 131; the magnetic permeability of the S-phase core column 112 is less than that of the R-phase core column 111, and the magnetic permeability of the T-phase core column 113 is equal to that of the R-phase core column 111.

[0127] Among them, the magnetic permeabilities of the R-phase core column 111 and the T-phase core column 113 are both μ1 The reluctances of the R-phase core column 111 and the T-phase core column 113 are both R 1 The reluctance of the S-phase yoke column 132 is R 2 The permeability of the S-phase yoke column 132 is μ 2 The permeabilities of the R-phase yoke column 131 and the T-phase yoke column 133 are both μ 3 The reluctances of the R-phase yoke column 131 and the T-phase yoke column 133 are both R 3 The permeability of the S-phase yoke column 132 is μ 3-1 The reluctance of the S-phase yoke column 132 is R 3-1 .

[0128] Figure 5 The equivalent magnetic circuit of the inductor core structure 100 is shown. According to the equivalent magnetic circuit of the inductor core structure 100, it can be known that the R-phase reluctance R R and the T-phase reluctance R T are equal, and R R =R T =R 1 +2R 3 ; the S-phase reluctance R S =R 1-1 +2R 3-1 / 2=R 1-1 +R 3-1 . In this way, by adjusting R 1-1 and R 3-1 , it can be understood that: by adjusting the magnetic path length and permeability of the S-phase yoke column 132, and adjusting the permeability of the S-phase core column 112, R R =R T =R S .

[0129] As Figures 6 - 10 shown, the inductor provided in the first embodiment of the present application includes: an inductor housing 300, and an inductor body located inside the inductor housing 300; wherein, the inductor body includes: a winding, and the above-mentioned inductor core structure 100.

[0130] In the inductor, the winding includes an R-phase winding 210, an S-phase winding 220, and a T-phase winding 230. The R-phase winding 210 is sleeved on the R-phase core column 111 of the R-phase core group 10, the S-phase winding 220 is sleeved on the S-phase core column 112 of the S-phase core group 20, and the T-phase winding 230 is sleeved on the T-phase core column 113 of the T-phase core group 30.

[0131] It should be noted that the R-phase winding 210 can be understood as a form of the first-phase winding, the S-phase winding 220 can be understood as a form of the second-phase winding, and the T-phase winding 230 can be understood as a form of the third-phase winding.

[0132] Since the inductance core structure 100 provided in the above-mentioned first embodiment has technical effects, and the inductor provided in the embodiment of the present application includes the above-mentioned inductance core structure 100, the above-mentioned inductor also has corresponding technical effects, which will not be elaborated here.

[0133] The wire structures of the R-phase winding 210, the S-phase winding 220, and the T-phase winding 230 can adopt round wires, flat wires, trapezoidal wires, or Litz wires, etc., and the first embodiment of the present application does not limit this. The wires of the R-phase winding 210, the S-phase winding 220, and the T-phase winding 230 can be copper wires or aluminum wires, etc., and the first embodiment of the present application also does not limit this.

[0134] The connection methods of the incoming and outgoing wires of the R-phase winding 210, the S-phase winding 220, and the T-phase winding 230 can adopt soft connections, hard connections, or a combination of soft and hard connections. Exemplarily, the connection structures of the incoming and outgoing wires of the R-phase winding 210, the S-phase winding 220, and the T-phase winding 230 are all hard connection structures or soft connection structures; or, among the incoming and outgoing structures of the R-phase winding 210, the S-phase winding 220, and the T-phase winding 230, one is all hard connection structures and the other is all soft connection structures.

[0135] In the inductor provided in the first embodiment of the present application, the inductor housing 300 includes: an R-phase placement cavity 311, an S-phase placement cavity 312, a T-phase placement cavity 313, a first coupling post placement cavity 321, a second coupling post placement cavity 322, a first yoke post placement cavity 331, and a second yoke post placement cavity 332; wherein, the R-phase placement cavity 311 is used to place the R-phase core post 111 and the R-phase winding 210, the S-phase placement cavity 312 is used to place the S-phase core post 112 and the S-phase winding 220, the T-phase placement cavity 313 is used to place the T-phase core post 113 and the T-phase winding 230, the first coupling post placement cavity 321 is used to place the first coupling post 121, the second coupling post placement cavity 322 is used to place the second coupling post 122, the first yoke post placement cavity 331 is used to place the first yoke post, and the second yoke post placement cavity 332 is used to place the second yoke post.

[0136] It should be noted that both the first yoke post and the second yoke post can be understood as yoke posts, and both the first yoke post and the second yoke post include an R-phase yoke post 131, an S-phase yoke post 132, and a T-phase yoke post 133. The first yoke post placement cavity 331 and the second yoke post placement cavity 332 can both be referred to as yoke post placement cavities. The first coupling post placement cavity 321 and the second coupling post placement cavity 322 can both be referred to as coupling post placement cavities. The above-mentioned respective placement cavities cooperate with the corresponding structures in the inductor body, so that the shapes of the respective placement cavities and the shapes of the corresponding structures in the inductor body form complementary structures, which is convenient for the assembly of the inductor body and the inductor housing 300.

[0137] To meet the requirements of protection level and heat dissipation, the inductor body can be encapsulated in the inductor housing 300. Exemplarily, the inductor body is encapsulated in the inductor housing 300 by potting glue. In the inductor, all the potting glue can be potting glue with the same thermal conductivity, or potting glue with different thermal conductivities. Exemplarily, the thermal conductivity of the potting glue in the inductor is 2.0 W / (m·K), or the thermal conductivity of the potting glue in the first part of the inductor housing 300 is 2.0 W / (m·K) and the thermal conductivity of the potting glue in the second part of the inductor housing 300 is 1.5 W / (m·K). It can be understood that potting is performed from one end in the second direction of the inductor housing 300, the first part is the lower half of the inductor housing 300, and the second part is the upper half of the inductor housing 300.

[0138] In actual situations, other potting methods can also be selected, and Embodiment 1 of this application does not limit this.

[0139] To ensure the heat dissipation performance of the inductor, the inductor housing 300 is a heat dissipation housing. Exemplarily, the inductor housing 300 is a metal housing. For the heat dissipation structure of the inductor housing 300, it is selected according to actual situations. Exemplarily, heat dissipation teeth 340 are provided on the outer wall of the inductor housing 300, and Embodiment 1 of this application does not limit this.

[0140] In the inductor core structure 100, to improve the heat dissipation effect of the S phase, the inductor housing 300 includes a first internal heat dissipation part 351 and a second internal heat dissipation part 352. The first internal heat dissipation part 351 is located between the S-phase winding 220 and the first coupling post 121, and the second internal heat dissipation part 352 is located between the S-phase winding 220 and the second coupling post 122.

[0141] For the heights of the first internal heat dissipation part 351 and the second internal heat dissipation part 352, they are selected according to actual situations. To facilitate installation and reduce the volume of the inductor, it can be selected that the height of the first internal heat dissipation part 351 is not greater than the height of the S-phase winding 220, and the height of the second internal heat dissipation part 352 is not greater than the height of the S-phase winding 220. Among them, the height direction is the second direction.

[0142] As described above, the magnetic path length of the S-phase yoke post 132 is greater than the magnetic path length of the R-phase yoke post 131, and the magnetic path length of the T-phase yoke post 133 is equal to the magnetic path length of the R-phase yoke post 131, effectively increasing the width a of the inner window in the S phase S then the first gap between the S-phase winding 220 and the first coupling post 121 increases, and the second gap between the S-phase winding 220 and the second coupling post 122 increases, so that the space in the inductor housing 300 corresponding to the first gap and the space in the inductor housing 300 corresponding to the second gap increase. In this case, it is more convenient to arrange the first internal heat dissipation part 351 and the second internal heat dissipation part 352.

[0143] For the thicknesses of the first inner heat dissipation part 351 and the second inner heat dissipation part 352, they are selected according to the actual situation. For the convenience of overall assembly, the thickness of the first inner heat dissipation part 351 in the first direction is not greater than the inner window difference, and the thickness of the second inner heat dissipation part 352 in the first direction is not greater than the inner window difference. The inner window difference is the difference between the inner window width of the S-phase core group 20 and the inner window width of the R-phase core group 10.

[0144] It should be noted that the thickness of the first inner heat dissipation part 351 in the first direction and the thickness of the second inner heat dissipation part 352 in the first direction are both b, then b ≤ x, and x = a S -a R 。

[0145] In actual situations, for the specific value of b, it is designed according to the heat dissipation requirements of the S phase. Embodiment 1 of the present application does not limit this.

[0146] In actual situations, it is also possible to choose b > x, which is not limited to the above embodiments.

[0147] For the specific structures of the first inner heat dissipation part 351 and the second inner heat dissipation part 352, they are designed according to the gap shape between the S-phase winding 220 and the coupling column. Embodiment 1 of the present application does not limit this.

[0148] Based on the above content, it can be seen that in the inductor provided in Embodiment 1 of the present application, by arranging the first inner heat dissipation part 351 and the second inner heat dissipation part 352, the contact area between the S-phase winding 220 and the inductor housing 300 is effectively increased, and the heat conduction distance between the S-phase winding 220 and the inductor housing 300 can also be reduced, greatly improving the heat conduction rate between the S-phase winding 220 and the inductor housing 300, improving the heat dissipation consistency of the R, S, and T phases, facilitating the realization of the thermal balance of the R, S, and T phases, reducing the operating temperature of the inductor during normal operation, for example, reducing the maximum operating temperature of the inductor during normal operation, and also avoiding adverse consequences such as winding thermal resistance deviation, current unevenness, and increased loss; it is also convenient to ensure the assembly of the inductor body and the inductor housing 300.

[0149] To improve the heat dissipation effect of the inductor, the inductor housing 300 may further include a third internal heat dissipation portion (not shown in the figure) and a fourth internal heat dissipation portion (not shown in the figure). Among them, the third internal heat dissipation portion is located between the R-phase winding 210 and the first coupling post 121, and the fourth internal heat dissipation portion is located between the T-phase winding 230 and the second coupling post 122. In this way, the third internal heat dissipation portion increases the heat dissipation area of the inductor housing 300, and can also reduce the heat conduction distance between the R-phase winding 210 and the inductor housing 300, greatly improving the heat conduction rate between the R-phase winding 210 and the inductor housing 300, thereby improving the heat dissipation effect and heat dissipation efficiency of the R-phase winding 210; the fourth internal heat dissipation portion increases the heat dissipation area of the inductor housing 300, and can also reduce the heat conduction distance between the T-phase winding 230 and the inductor housing 300, greatly improving the heat conduction rate between the T-phase winding 230 and the inductor housing 300, thereby improving the heat dissipation effect and heat dissipation efficiency of the T-phase winding 230.

[0150] For the heights of the third internal heat dissipation portion and the fourth internal heat dissipation portion, they are selected according to the actual situation. For the convenience of installation and to reduce the volume of the inductor, it can be selected that the height of the third internal heat dissipation portion is not greater than the height of the R-phase winding 210, and the height of the fourth internal heat dissipation portion is not greater than the height of the T-phase winding 230. Among them, the height direction is the second direction.

[0151] For the thicknesses of the third internal heat dissipation portion and the fourth internal heat dissipation portion in the first direction, they are selected according to the actual situation, and Embodiment 1 of the present application does not limit this.

[0152] For the specific structures and shapes of the third internal heat dissipation portion and the fourth internal heat dissipation portion, they are selected according to the actual situation, and Embodiment 1 of the present application does not limit this.

[0153] As shown above, the inductor core structure provided in Embodiment 1 of the present application improves the magnetic resistance consistency of the magnetic paths of the R, S, and T phases, facilitating the realization of three-phase magnetic path balance. Therefore, the inductor provided in Embodiment 1 of the present application is not only convenient for realizing the three-phase magnetic path balance of R, S, and T, but also convenient for realizing the three-phase heat balance of R, S, and T, facilitating the engineering application of the inductor.

[0154] Embodiment 2 of the present application

[0155] In Embodiment 2 of the present application, by reducing the thickness of the S-phase yoke post 132, the cross-sectional area of the S-phase yoke post 132 is reduced to increase the magnetic resistance of the S-phase yoke post, thereby increasing the S-phase magnetic resistance, and the magnetic resistance consistency of the three-phase magnetic paths can be achieved (the magnetic resistances of the three-phase magnetic paths are equal or approximately equal).

[0156] As Figure 11 and Figure 12As shown, the inductor core structure 100 provided in the second embodiment of the present application includes: an R-phase core group, an S-phase core group, a T-phase core group, a first coupling column 121, and a second coupling column 122. For the description of this part, reference can be made to the foregoing text, and details will not be elaborated here.

[0157] In the inductor core structure 100 provided in the second embodiment of the present application, for the description of the core column, the R-phase yoke column 131, and the T-phase yoke column 133, reference can be made to the foregoing description, and details will not be elaborated here.

[0158] In the inductor core structure 100 provided in the second embodiment of the present application, at least part of the thickness of the S-phase yoke column 132 is less than the thickness of the R-phase yoke column 131, and the thickness of the T-phase yoke column 133 is equal to the thickness of the R-phase yoke column 131; wherein, the R-phase yoke column 131, the S-phase yoke column 132, and the T-phase yoke column 133 can all be understood as yoke columns, and the thickness direction of the yoke column is perpendicular to the first direction and the second direction; the thickness direction of the yoke column can be understood as Figure 11 and Figure 12 the third direction in

[0159] In the second embodiment of the present application, the cross-sectional area of the S-phase yoke column 132 is rectangular, and the thickness of the S-phase yoke column 132 is one side length of the cross-sectional area of the S-phase yoke column 132. In this way, by making at least part of the thickness of the S-phase yoke column 132 less than the thickness of the R-phase yoke column 131, the thickness of at least part of the S-phase yoke column 132 can be reduced, thereby reducing the cross-sectional area of the S-phase yoke column 132; it is also convenient for processing and manufacturing the S-phase yoke column 132, and thus convenient for assembling the inductor.

[0160] As Figure 11 shown, the S-phase yoke column 132 is a constant-thickness structure, which can be understood as: in the third direction, the thickness at any two positions of the S-phase yoke column 132 is equal. In this way, it is convenient for processing and manufacturing the S-phase yoke column 132 and also convenient for assembling the inductor. In this case, if the inner window sizes of the three phases are kept unchanged and the magnetic permeabilities of the three phases are unchanged, the thickness of the S-phase yoke column 132 can be selected to be 0.5 times the thickness of the R-phase yoke column 131. In this way, referring to Figure 5 it can be known that R 1-1 =R 1 , R 3-1 =2R 3 , R S =R 1 +(2*2R 3 ) / 2 = R 1 +2R 3 =R R =R T . It can be seen from this that it is convenient to make the magnetic resistances of the three-phase magnetic circuits equal.

[0161] As Figure 12As shown, the S-phase yoke column 132 has a non-uniform thickness structure. In this way, it is convenient to adjust the magnetic resistance of the S-phase yoke column 132, thereby facilitating the improvement of the magnetic resistance consistency of the three-phase magnetic circuit; it is also convenient to increase the assembly area (such as the bonding area) between the S-phase yoke column 132 and the coupling column, facilitating the guarantee of the stability of the mechanical structure.

[0162] In some embodiments, it can be selected that in the first direction, both end portions of the S-phase yoke column 132 have a uniform thickness structure and are of equal thickness, and the thickness of the middle portion of the S-phase yoke column 132 is less than the thickness of the end portions. In this case, the thickness of both end portions of the S-phase yoke column 132 is equal to the thickness of the coupling column. It can be understood that: the thickness of one end portion of the S-phase yoke column 132 is equal to the thickness of the first coupling column 121, and the thickness of the other end portion of the S-phase yoke column 132 is equal to the thickness of the second coupling column 122. In this way, the cross-section of the connection surface between the S-phase yoke column 132 and the coupling column is ensured to be unchanged, facilitating the production and manufacturing of the inductor.

[0163] Exemplarily, as Figure 12 shown, the thicknesses of the two equal-thickness segments are the largest, and the thickness of one equal-thickness segment is the smallest. In this way, the S-phase yoke column 132 can have a "concave" shape structure or a double "concave" shape structure. It should be noted that Figure 12 the shown S-phase yoke column 132 has a double "concave" shape structure.

[0164] In the above structure, the middle portion of the S-phase yoke column 132 can have a uniform thickness structure or a non-uniform thickness structure, which is selected according to the actual situation.

[0165] Of course, the non-uniform thickness structure of the S-phase yoke column 132 can be selected as other structures. Exemplarily, in the first direction, both end portions of the S-phase yoke column 132 have a non-uniform thickness structure. Embodiment 2 of the present application does not limit this.

[0166] As Figure 11 and Figure 12 shown, the first side of the S-phase yoke column 132 is recessed toward the second side, and the second side of the S-phase yoke column 132 is recessed toward the first side. Among them, the first side and the second side are sequentially distributed along the third direction. In this way, the bilateral reduction of the S-phase yoke column 132 is achieved. Of course, the unilateral reduction of the S-phase yoke column 132 can be selected. For example, the first side of the S-phase yoke column 132 is recessed toward the second side, or the second side of the S-phase yoke column 132 is recessed toward the first side.

[0167] As Figure 11 shown, the S-phase yoke column 132, the first coupling column 121, and the second coupling column 122 form two recessed portions 134; as Figure 12 shown, the S-phase yoke column 132 itself forms two recessed portions 134.

[0168] In the second embodiment of the present application, the S-phase yoke column 132 may be a symmetric structure. The S-phase yoke column 132 is symmetric about the first symmetry plane and / or the S-phase yoke column 132 is symmetric about the second symmetry plane. Among them, the first symmetry plane is parallel to the first direction, and the second symmetry plane is parallel to the third direction. In this way, it is convenient to process and manufacture the S-phase yoke column 132, and it is also convenient to assemble the S-phase yoke column 132 in the inductor, so as to obtain the inductor conveniently.

[0169] Of course, it is also possible to select that the S-phase yoke column 132 is symmetric about other planes, or the S-phase yoke column 132 is an asymmetric structure. The second embodiment of the present application does not limit this.

[0170] In the second embodiment of the present application, on the basis of reducing the thickness of the S-phase yoke column 132, the magnetic resistance of the S-phase yoke column 132 can be further increased by reducing the magnetic path length of the S-phase yoke column 132 and / or reducing the magnetic permeability of the S-phase yoke column 132, etc., and it is not limited to the above method (reducing the thickness of the S-phase yoke column 132).

[0171] The inductor provided in the second embodiment of the present application includes: an inductor housing 300, and an inductor body located inside the inductor housing 300; among them, the inductor body includes: a winding and the above-mentioned inductor core structure. Among them, the description of the winding and the description of the assembly of the winding and the inductor housing 300 can be referred to the previous text, and will not be elaborated here.

[0172] In the second embodiment of the present application, for the inductor housing 300, reference can be made to the previous text, and it will not be elaborated here.

[0173] As described above, at least part of the thickness of the S-phase yoke column 132 is less than the thickness of the R-phase yoke column 131, and the thickness of the T-phase yoke column 133 is equal to the thickness of the R-phase yoke column 131. Based on this, in the second embodiment of the present application, the structure of the inductor housing 300 is different from that of the first embodiment of the present application.

[0174] In the second embodiment of the present application, in the S-phase yoke column placement cavity of the inductor housing 300, an adaptation structure is provided at a position corresponding to the S-phase yoke column 132. The adaptation structure is adapted to the S-phase yoke column 132, and the adaptation structure is a heat dissipation structure.

[0175] Exemplarily, as Figure 13 and Figure 14 shown, the yoke column placement cavity of the inductor housing 300 includes a first yoke column placement cavity 331 and a second yoke column placement cavity 332. The first yoke column placement cavity 331 has a first adaptation structure 3311, the first adaptation structure 3311 is adapted to one S-phase yoke column 132, the second yoke column placement cavity 332 has a second adaptation structure 3321, the second adaptation structure 3321 is adapted to the other S-phase yoke column 132, and both the first adaptation structure 3311 and the second adaptation structure 3321 are heat dissipation structures.

[0176] It should be noted that Figure 13 and Figure 14 the inductor housing 300 shown is adapted to Figure 11 the inductor body shown. In the third direction, the first adaptation structure 3311 protrudes, and the second adaptation structure 3321 protrudes, so that the first adaptation structure 3311 and a recess 134 of the S-phase yoke column 132 are in concave-convex fit, and the second adaptation structure 3321 and another recess 134 of the S-phase yoke column 132 are in concave-convex fit. In the case where the S-phase yoke column 132 has only one recess 134, there is only the first adaptation structure 3311 or the second adaptation structure 3321. Figure 11 The shape of the first adaptation structure 3311 or the second adaptation structure 3321 shown can be adjusted to adapt to Figure 12 the inductor body shown.

[0177] In the second embodiment of the present application, through the adaptation structure being adapted to the S-phase yoke column 132, and the adaptation structure being a heat dissipation structure, it is convenient to ensure the heat conduction distance between the S-phase yoke column 132 and the inductor housing 300, and also reduce the heat conduction distance between the S-phase winding 220 and the inductor housing 300. It can also increase the contact area between the S-phase yoke column 132 and the inductor housing 300, thereby improving the heat dissipation effect of the S-phase and facilitating meeting the heat dissipation requirements of the S-phase; it is also convenient to ensure the assembly of the inductor body and the inductor housing 300; it also increases the heat dissipation area of the entire inductor housing 300 and improves the heat dissipation effect of the entire inductor.

[0178] In the third embodiment of the present application

[0179] In the third embodiment of the present application, by reducing the width of the S-phase yoke column 132, the cross-sectional area of the S-phase yoke column 132 is reduced to increase the magnetic resistance of the S-phase yoke column, thereby increasing the S-phase magnetic resistance, and the magnetic resistance of the three-phase magnetic circuit can be made consistent (the magnetic resistances of the three-phase magnetic circuits are equal or approximately equal).

[0180] As Figure 15 and Figure 16 shown, the inductor core structure 100 provided in the third embodiment of the present application includes: an R-phase core group 10, an S-phase core group 20, a T-phase core group 30, a first coupling column 121, and a second coupling column 122. For the description of this part, reference can be made to the foregoing, and details are not repeated here.

[0181] Regarding the description of the core column, the R-phase yoke column 131, and the T-phase yoke column 133 in the inductor core structure 100 provided in the third embodiment of the present application, reference can be made to the foregoing description, and details are not repeated here.

[0182] In the inductor core structure 100 provided in the third embodiment of the present application, the width of at least a part of the S-phase yoke column 132 is smaller than the width of the R-phase yoke column 131, and the width of the T-phase yoke column 133 is equal to the width of the R-phase yoke column 131; wherein, the width direction of the R-phase yoke column 131, the S-phase yoke column 132, and the T-phase yoke column 133 is the second direction.

[0183] In the third embodiment of the present application, the cross-sectional area of the S-phase yoke column 132 is rectangular, and the width of the S-phase yoke column 132 is one side length of the cross-sectional area of the S-phase yoke column 132. In this way, by making the width of at least a part of the S-phase yoke column 132 smaller than the width of the R-phase yoke column 131, the width of at least a part of the S-phase yoke column 132 can be reduced, so that the cross-sectional area of the S-phase yoke column 132 can be reduced; it is also convenient to process and manufacture the S-phase yoke column 132, so as to facilitate obtaining the inductor.

[0184] As Figure 16 shown, the S-phase yoke column 132 is a constant-width structure. It can be understood that: in the second direction, the widths of any two positions of the S-phase yoke column 132 are equal. In this way, it is convenient to process and manufacture the S-phase yoke column 132, so as to facilitate obtaining the inductor. In this case, if the inner window sizes of the three phases remain unchanged and the magnetic permeabilities of the three phases remain unchanged, the width of the S-phase yoke column 132 can be selected to be 0.5 times the width of the R-phase yoke column 131. In this way, referring to Figure 5 it can be known that R 1-1 =R 1 , R 3-1 =2R 3 , R S =R 1 +(2*2R 3 ) / 2 = R 1 +2R 3 =R R =R T . Therefore, it is convenient to make the magnetic resistances of the three-phase magnetic circuits equal.

[0185] As Figure 15 shown, the S-phase yoke column 132 is a non-constant-width structure. In this way, it is convenient to adjust the magnetic resistance of the S-phase yoke column 132 and improve the magnetic resistance consistency of the three-phase magnetic circuit.

[0186] In some embodiments, it is possible to select that in the first direction, both ends of the S-phase yoke column 132 have an equal-width structure and the widths are equal, and the width of the middle part of the S-phase yoke column 132 is smaller than the width of the ends. In this case, the widths of both ends of the S-phase yoke column 132 are equal to the width of the coupling column. It can be understood that: the width of one end of the S-phase yoke column 132 is equal to the width of the first coupling column 121, and the width of the other end of the S-phase yoke column 132 is equal to the width of the second coupling column 122. In this way, it is ensured that the cross-section of the connection surface between the S-phase yoke column 132 and the coupling column remains unchanged, which is convenient for the production and manufacturing of the inductor. In the above structure, the middle part of the S-phase yoke column 132 can be an equal-width structure or a non-equal-width structure, which is selected according to the actual situation.

[0187] Exemplarily, such as Figure 15 shown, the widths of the two equal-width segments are the largest, and the width of one equal-width segment is the smallest. In this way, the S-phase yoke column 132 can be in a "concave" shape structure or a double "concave" shape structure. It should be noted that Figure 15 the S-phase yoke column 132 shown is in a "concave" shape structure.

[0188] Of course, the non-equal-width structure of the S-phase yoke column 132 can be selected as other structures. Exemplarily, in the first direction, both ends of the S-phase yoke column 132 are non-equal-width structures. Embodiment 3 of the present application does not limit this.

[0189] In Embodiment 3 of the present application, in order to facilitate the cooperation between the S-phase yoke column 132 and the S-phase core column 112, it is possible to select that in the second direction, the first side of the S-phase yoke column 132 is recessed towards the second side, and the second side of the S-phase yoke column 132 is close to the S-phase core column 112. In this case, the S-phase yoke column 132 can be in a "concave" shape structure. Of course, the S-phase yoke column 132 can be selected as other structures. Embodiment 3 of the present application does not limit this.

[0190] In Embodiment 3 of the present application, the S-phase yoke column 132 can be a symmetric structure, and the symmetry plane of the S-phase yoke column 132 is parallel to the second direction. In this way, it is convenient to process and manufacture the S-phase yoke column 132; it is also convenient to assemble the S-phase yoke column 132, thereby facilitating the obtaining of the inductor.

[0191] Of course, it is also possible to select that the S-phase yoke column 132 is symmetric about other planes, or the S-phase yoke column 132 is an asymmetric structure. Embodiment 3 of the present application does not limit this.

[0192] In Embodiment 3 of the present application, on the basis of reducing the width of the S-phase yoke column 132, the magnetic resistance of the S-phase yoke column 132 can be further increased by reducing the magnetic path length of the S-phase yoke column 132, and / or reducing the magnetic permeability of the S-phase yoke column 132, and / or reducing the thickness of the S-phase yoke column 132, etc., and it is not limited to the above method (reducing the thickness of the S-phase yoke column 132).

[0193] The inductor provided in the third embodiment of the present application includes: an inductor housing 300 and an inductor body located inside the inductor housing 300; wherein, the inductor body includes: a winding and the above-mentioned inductor core structure. Among them, the description of the winding and the description of the assembly of the winding and the inductor housing 300 can be referred to the previous text and will not be elaborated here.

[0194] In the third embodiment of the present application, for the inductor housing 300, reference can be made to the previous text and will not be elaborated here.

[0195] As described above, at least part of the width of the S-phase yoke column 132 is smaller than the width of the R-phase yoke column 131, and the width of the T-phase yoke column 133 is equal to the width of the R-phase yoke column 131. Based on this, in the third embodiment of the present application, the structure of the inductor housing 300 is different from that of the first and second embodiments of the present application.

[0196] In the third embodiment of the present application, in the S-phase yoke column placement cavity of the inductor housing 300, an adaptation structure is provided at a position corresponding to the S-phase yoke column 132. The adaptation structure is adapted to the S-phase yoke column 132, and the adaptation structure is a heat dissipation structure.

[0197] Exemplarily, as Figure 17 shown, the yoke column placement cavity of the inductor housing 300 includes a first yoke column placement cavity 331 and a second yoke column placement cavity 332. The first yoke column placement cavity 331 has a first adaptation structure 3311, the first adaptation structure 3311 is adapted to one S-phase yoke column 132, the second yoke column placement cavity 332 has a second adaptation structure 3321, the second adaptation structure 3321 is adapted to the other S-phase yoke column 132, and both the first adaptation structure 3311 and the second adaptation structure 3321 are heat dissipation structures.

[0198] It should be noted that Figure 17 the inductor housing 300 shown is adapted to Figure 16 the inductor body shown. In the second direction, the first adaptation structure 3311 protrudes, and the second adaptation structure 3321 protrudes, so that the first adaptation structure 3311 and a recess 134 of the S-phase yoke column 132 are in concave-convex fit, and the second adaptation structure 3321 and the other recess 134 of the S-phase yoke column 132 are in concave-convex fit. In the case where the S-phase yoke column 132 has only one recess 134, there is only the first adaptation structure 3311 or the second adaptation structure 3321. Figure 17 The shape of the first adaptation structure 3311 or the second adaptation structure 3321 shown can be adjusted to adapt to Figure 15 the inductor body shown.

[0199] It should be noted that, as Figure 15 shown, the S-phase yoke column 132 itself forms two recesses 134. As Figure 16As shown, the S-phase yoke column 132, the first coupling column 121, and the second coupling column 122 form two recessed portions 134.

[0200] In the third embodiment of the present application, through the adaptation structure adapted to the S-phase yoke column 132, and the adaptation structure is a heat dissipation structure, it is convenient to ensure the heat conduction distance between the S-phase yoke column 132 and the inductor housing 300, and also reduce the heat conduction distance between the S-phase winding 220 and the inductor housing 300. It can also increase the contact area between the S-phase yoke column 132 and the inductor housing 300, thereby improving the heat dissipation effect of the S-phase and facilitating meeting the heat dissipation requirements of the S-phase; it is also convenient to ensure the assembly of the inductor body and the inductor housing 300; it also increases the heat dissipation area of the entire inductor housing 300 and improves the heat dissipation effect of the entire inductor.

[0201] The fourth embodiment of the present application

[0202] For the inductor core structure provided in the fourth embodiment of the present application, by reducing the magnetic permeability of the S-phase yoke column 132 to increase the magnetic resistance of the S-phase yoke column, thereby increasing the S-phase magnetic resistance, the magnetic resistance of the three-phase magnetic circuit can be made consistent (the magnetic resistances of the three-phase magnetic circuits are equal or approximately equal).

[0203] Such as Figure 18 and Figure 20 As shown, based on the first embodiment of the present application, for the inductor core structure provided in the fourth embodiment of the present application, by including the first air gap 150 in the S-phase yoke column 132, the magnetic permeability of the S-phase yoke column 132 is reduced to achieve that the magnetic permeability of the S-phase yoke column 132 is less than the magnetic permeability of the R-phase yoke column 131, and the magnetic permeability of the T-phase yoke column 133 is the same as the magnetic permeability of the R-phase yoke column 131.

[0204] For the inductor core structure, the first air gap 150 can be distributed at any position of the S-phase yoke column 132. For the convenience of installation, it can be selected that the first air gap 150 is distributed at both ends of the S-phase yoke column 132 in the first direction, and the first air gap 150 is in contact with the corresponding coupling column. In this case, there are four first air gaps 150 in the inductor core structure, which can be understood as being distributed between the S-phase yoke column 132 and the first coupling column 121, and between the S-phase yoke column 132 and the second coupling column 122.

[0205] For the size of the first air gap 150, it is selected according to the actual situation, and the fourth embodiment of the present application does not limit this.

[0206] The magnetic permeability of the first air gap 150 is μ gap , μ gap = 1; the magnetic resistance of the first air gap 150 is R gap . Figure 19 Shows Figure 18 the equivalent magnetic circuit of the inductor core structure shown in Figure 19 It can be known fromS = R 1-1 + 2(R 3-1 + R gap ) / 2 = R 1-1 + R 3-1 + R gap 。In this case, μ 1-1 can be any magnetic permeability, μ 31 can be any magnetic permeability. By adjusting R 1-1 , R 3-1 , R gap , it is possible to achieve R R = R S = R T .

[0207] In actual situations, a filler can be placed or not placed in the first air gap 150. The magnetic permeability of the filler is less than that of the R-phase yoke column 131.

[0208] In the above inductor core structure, in addition to increasing the magnetic path length of the S-phase yoke column 132 to balance the magnetic resistance, the equivalent magnetic permeability of the S-phase yoke column 132 is adjusted by adding the first air gap 150 to the S-phase yoke column 132, which is convenient for improving the magnetic resistance consistency of the three-phase magnetic path.

[0209] In the fourth embodiment of the present application, it is also possible to select different materials for the S-phase yoke column 132 and the R-phase yoke column 131, and the same material for the T-phase yoke column 133 and the R-phase yoke column 131, so as to achieve that the magnetic permeability of the S-phase yoke column 132 is less than that of the R-phase yoke column 131 and the magnetic permeability of the T-phase yoke column 133 is the same as that of the R-phase yoke column 131. Such an operation is also convenient for achieving that the magnetic permeability of the S-phase yoke column 132 is less than that of the R-phase yoke column 131.

[0210] It should be noted that different materials can be understood as different material grades. The same materials can be understood as the same material grades.

[0211] In the fourth embodiment of the present application, an air gap can also be added to the S-phase core column 112 to reduce the magnetic permeability of the S-phase core column 112, thereby reducing the magnetic resistance of the S-phase core column 112 and further reducing the magnetic resistance of the S-phase magnetic path. In some embodiments, the S-phase core column 112 includes a second air gap to achieve that the magnetic permeability of the S-phase core column 112 is less than that of the R-phase core column 111 and the magnetic permeability of the T-phase core column 113 is the same as that of the R-phase core column 111. In this way, it is convenient for operation and also convenient for achieving that the magnetic permeability of the S-phase core column 112 is less than that of the R-phase core column 111.

[0212] The specific position of the second air gap in the S-phase core column 112 and the specific size of the second air gap are selected according to actual situations, and the fourth embodiment of the present application does not limit this.

[0213] In actual situations, a filler may or may not be placed in the second air gap, and the magnetic permeability of the filler is less than that of the R-phase yoke column 131.

[0214] In the fourth embodiment of the present application, reducing the magnetic permeability of the S-phase core column 112 can also be achieved by other means. In some embodiments, the material of the S-phase core column 112 is different from that of the R-phase core column 111, and the material of the T-phase core column 113 is the same as that of the R-phase core column 111, so as to achieve that the magnetic permeability of the S-phase core column 112 is less than that of the R-phase core column 111 and the magnetic permeability of the T-phase core column 113 is the same as that of the R-phase core column 111. Such an operation also facilitates achieving that the magnetic permeability of the S-phase core column 112 is less than that of the R-phase core column 111.

[0215] As described above, different materials can be understood as different material grades, and the same materials can be understood as the same material grades.

[0216] It should be noted that the solutions mentioned in the fourth embodiment of the present application can also be carried out on the basis of the second or third embodiment of the present application, so as to achieve that the magnetic permeability of the S-phase yoke column 132 is less than that of the R-phase yoke column 131 and the magnetic permeability of the T-phase yoke column 133 is the same as that of the R-phase yoke column 131, and to achieve that the magnetic permeability of the S-phase core column 112 is less than that of the R-phase core column 111 and the magnetic permeability of the T-phase core column 113 is the same as that of the R-phase core column 111.

[0217] The inductor provided in the fourth embodiment of the present application includes: an inductor housing 300 and an inductor body located inside the inductor housing 300; wherein, the inductor body includes: a winding and the above-mentioned inductor core structure 100. For the description of this part, reference can be made to Embodiment 1, and details will not be elaborated here.

[0218] The above four embodiments can be combined according to actual situations, and the technical solutions provided by the present application are not limited to the above four embodiments.

[0219] The inductor provided by the embodiment of the present application is a three-phase five-column inductor. By adopting magnetic integration technology, magnetic resistance balance technology, and thermal resistance balance technology, three single-phase independent inductors in the three-phase power circuit of the inverter are integrated together, which can meet performance indicators such as the stability of the inverter system, ripple current, total harmonic current distortion rate of the three-phase circuit, three-phase magnetic consistency, three-phase low mutual inductance, and three-phase thermal balance. At the same time, this integrated inductor reduces the usage amount of the magnetic core compared with three single-phase independent inductors, reduces the volume, and reduces the weight, which is beneficial to the spatial layout of the inverter system, and also reduces the magnetic core loss and improves the efficiency of the system.

[0220] Based on the inductor provided by the embodiments of the present application, the embodiments of the present application further provide an inverter, which includes the inductor provided by the above embodiments. Among them, the inverter can be understood as a three-phase inverter.

[0221] As Figure 21 shown, the above inverter may further include a DC / AC circuit (direct current / alternating current circuit), and the three windings (R-phase winding 210, S-phase winding 220, T-phase winding 230) in the inductor are respectively the three filter inductors of the inverter, and the three-phase output terminals of the DC / AC circuit are respectively connected to the three filter inductors.

[0222] The present application does not limit the specific application scenarios of the inverter. For example, the inverter can be applied to a photovoltaic power generation scenario. The input terminal of the inverter is used to connect to a photovoltaic array, and the inverter is used to convert the direct current output by the photovoltaic array into alternating current to provide for an AC load or for grid-connected power generation.

[0223] Since the inverter provided by the embodiments of the present application includes the inductor provided by the above embodiments, and the volume of the above inductor is small and the weight is light, therefore, it is beneficial to reduce the volume of the inverter, reduce the weight of the inverter, facilitate the spatial layout inside the inverter cabinet, and can reduce the cost of the photovoltaic system when the inverter is applied to a photovoltaic system; moreover, the number of magnetic cores is small, reducing the magnetic core loss and improving the power generation efficiency; the inductor has magnetic balance technology and thermal balance technology, which is beneficial to improving the power quality of the circuit, reducing the internal heat concentration of the inductor and improving heat dissipation, and improving the device life and reliability.

[0224] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An inductor core structure, characterized in that: include: A first phase core group, a first coupling column, a second phase core group, a second coupling column and a third phase core group are sequentially distributed along a first direction; Wherein, the first phase core group, the second phase core group and the third phase core group each include a core column and two yoke columns; in the second direction, the two yoke columns are respectively located at two ends of the core column; the second direction is perpendicular to the first direction; In the first phase core group, the core column is a first phase core column, and the yoke column is a first phase yoke column; in the second phase core group, the core column is a second phase core column, and the yoke column is a second phase yoke column; in the third phase core group, the core column is a third phase core column, and the yoke column is a third phase yoke column; The magnetic resistance of the second phase yoke column is greater than the magnetic resistance of the first phase yoke column, and the magnetic resistance of the first phase yoke column is equal to the magnetic resistance of the third phase yoke column; and / or, the magnetic resistance of the second phase core column is greater than the magnetic resistance of the first phase core column, and the magnetic resistance of the first phase core column is equal to the magnetic resistance of the third phase core column.

2. The inductor core structure according to claim 1, characterized in that: The magnetic path length of the second phase yoke column is greater than that of the first phase yoke column, and the magnetic path length of the first phase yoke column is equal to that of the third phase yoke column; wherein the magnetic path length direction of the yoke column is parallel to the first direction.

3. The inductor core structure according to claim 1 or 2, characterized in that: The cross-sectional area of ​​the second phase yoke column is smaller than the cross-sectional area of ​​the first phase yoke column, and the cross-sectional area of ​​the first phase yoke column is equal to the cross-sectional area of ​​the third phase yoke column; wherein the cross-sectional area of ​​the yoke column is perpendicular to the first direction.

4. The inductor core structure according to claim 3, characterized in that: The thickness of at least part of the second phase yoke column is smaller than the thickness of the first phase yoke column, and the thickness of the first phase yoke column is equal to the thickness of the third phase yoke column; wherein the thickness direction of the yoke column is perpendicular to the first direction and the second direction.

5. The inductor core structure according to claim 4, characterized in that: The second phase yoke column is a structure of equal thickness.

6. The inductor core structure according to claim 5, characterized in that: The thickness of the second phase-conjugated column is 0.5 times the thickness of the first phase-conjugated column.

7. The inductor core structure according to claim 4, characterized in that: The second phase yoke column is a non-uniform thickness structure.

8. The inductor core structure according to claim 7, characterized in that: In the first direction, both ends of the second phase yoke column are equal thickness structures and have equal thickness, and the middle thickness of the second phase yoke column is smaller than the end thickness; the thickness of both ends of the second phase yoke column, the thickness of the first coupling column, and the thickness of the second coupling column are equal; And / or, in the thickness direction of the second phase yoke column, the first side of the second phase yoke column is recessed toward the second side, and / or the second side of the second phase yoke column is recessed toward the first side.

9. The inductor core structure according to claim 7, characterized in that: The second yoke column is a symmetrical structure, and the second yoke column is symmetrical about the first symmetry plane and / or the second symmetry plane; wherein the first symmetry plane is parallel to the first direction, or the second symmetry plane is parallel to the thickness direction of the second yoke column.

10. The inductor core structure according to claim 3, characterized in that: The width of at least part of the second yoke column is smaller than the width of the first yoke column, and the width of the first yoke column is equal to the width of the third yoke column; wherein the width direction of the yoke column is the second direction.

11. The inductor core structure according to claim 10, characterized in that: The second phase yoke column is a structure of equal width.

12. The inductor core structure according to claim 11, characterized in that: The width of the second phase-conjugated column is 0.5 times the width of the first phase-conjugated column.

13. The inductor core structure according to claim 10, characterized in that: The second phase yoke column is a non-uniform width structure.

14. The inductor core structure according to claim 13, characterized in that: In the first direction, both ends of the second phase yoke column are equal-width structures and have equal widths, and the width of the middle part of the second phase yoke column is smaller than the width of the end part; the widths of both ends of the second phase yoke column, the width of the first coupling column and the width of the second coupling column are equal; and / or, in the second direction, the first side of the second phase yoke column is recessed toward the second side, and the second side of the second phase yoke column is close to the second phase core column; And / or, the second phase-conjugated column is a symmetrical structure, and a symmetry plane of the second phase-conjugated column is parallel to the second direction.

15. The inductor core structure according to claim 1 or 2, characterized in that: The magnetic permeability of the second phase yoke column is less than the magnetic permeability of the first phase yoke column, and the magnetic permeability of the first phase yoke column is equal to the magnetic permeability of the third phase yoke column; And / or, the magnetic permeability of the second phase core column is less than the magnetic permeability of the first phase core column, and the magnetic permeability of the first phase core column is equal to the magnetic permeability of the third phase core column.

16. The inductor core structure according to claim 15, characterized in that: The second phase-yoke column includes a first air gap.

17. The inductor core structure according to claim 16, characterized in that: The first air gaps are distributed at two ends of the second phase-conjugate column in the first direction, and the first air gaps are in contact with corresponding coupling columns.

18. The inductor core structure according to claim 15, characterized in that: The material of the second phase-yoke column is different from that of the first phase-yoke column, and the material of the first phase-yoke column is the same as that of the third phase-yoke column.

19. The inductor core structure according to claim 15, characterized in that: In the second phase core group, the core column includes a second air gap.

20. The inductor core structure according to claim 15, characterized in that: The material of the second phase core column is different from the material of the first phase core column, and the material of the first phase core column is the same as the material of the third phase core column.

21. An inductor, characterized in that: include: An inductor shell, an inductor body located in the inductor shell; the inductor body comprises: a winding, and an inductor core structure as described in any one of claims 1 to 20; wherein the winding comprises a first winding, a second winding and a third winding, the first winding is sleeved on the first phase core column, the second winding is sleeved on the second phase core column, and the third winding is sleeved on the third phase core column.

22. The inductor according to claim 21, characterized in that: The inductor housing is a heat dissipation housing; The inductor housing includes a first inner heat dissipation portion and a second inner heat dissipation portion, the first inner heat dissipation portion is located between the second winding and the first coupling column, and the second inner heat dissipation portion is located between the second winding and the second coupling column; And / or, the inductor housing comprises a third inner heat dissipation portion and a fourth inner heat dissipation portion, the third inner heat dissipation portion is located between the first winding and the first coupling column, and the fourth inner heat dissipation portion is located between the third winding and the second coupling column; And / or, when the cross-sectional area of ​​the second phase yoke column is smaller than the cross-sectional area of ​​the first phase yoke column and the cross-sectional area of ​​the first phase yoke column is equal to the cross-sectional area of ​​the third phase yoke column: the inductor housing includes a yoke column placement cavity; in the yoke column placement cavity, an adaptation structure is provided at a position corresponding to the second phase yoke column, the adaptation structure is adapted to the second phase yoke column, and the adaptation structure is a heat dissipation structure.

23. An inverter, characterized in that: Comprising an inductor as claimed in claim 21 or 22.

Images