THREE-VOLTAGE CHARGE WITH IRON CORE UNITS AND COILS

Abstract

Three-phase choke, which includes the following: an outer circumferential iron core (20), wherein the outer circumferential iron core (20) comprises a plurality of outer circumferential iron core units (21 to 23), and at least three iron core coils (31 to 33) that come into contact with or are connected to an inner surface of the outer circumferential iron core (20), wherein the at least three iron core coils (31 to 33) comprise corresponding iron cores (41 to 43) and corresponding windings (51 to 53) wound around the iron cores (41 to 43), each of the iron cores (41 to 43) extending in a radial direction of the outer circumferential iron core (20), the three-phase choke further comprises a plurality of intermediate coil iron cores (81 to 83) arranged between the at least three iron core coils (31 to 33), and Columns (101 to 103), which can magnetically connect the at least three iron core coils (31 to 33) and the intermediate coil iron cores (81 to 83), are formed between the at least three iron core coils (31 to 33) and the intermediate coil iron cores (81 to 83).

Description

STATE OF THE ART 1. Field of the invention

[0001] The present invention relates to a three-phase choke comprising iron core units and windings. 2. Description of the state of the art

[0002] Three-phase chokes typically have three iron cores and three windings wound around the iron cores. JP H02-203 507 A discloses a three-phase choke having three coils placed side by side. WO 2014 / 033830 A1 discloses that the corresponding central axes of several coils are arranged around the central axis of a three-phase choke. JP 2008-177 500 A discloses a three-phase choke having several straight magnetic cores arranged radially, connecting magnetic cores that join the straight magnetic cores, and windings wound around the straight magnetic cores and the connecting magnetic cores.

[0003] From DE 10 2016 010 901 A1 a three-phase reactor with iron core units and coils is known, comprising a central iron core; an outer circumferential iron core surrounding the central iron core; and at least three connecting units that magnetically connect the central iron core and the outer circumferential iron core, wherein each of the connecting units contains at least one connecting iron core, at least one coil wound around the connecting iron core and at least one gap. BRIEF SUMMARY OF THE INVENTION

[0004] A three-phase current flows through a coil of a three-phase choke in each phase. In a conventional three-phase choke (JP H02-203 507 A), the length of a magnetic path, due to the magnetism generated when currents flow through the coils in two possible phases, can depend on the combination of phases. Consequently, a problem arose because, even when three-phase currents flow in a balanced manner through the corresponding phases of a three-phase choke, the magnetic flux densities flowing through the iron cores in the corresponding phases are different, and the inductances are also unbalanced.

[0005] In a conventional three-phase choke (JP H02-203 507), it may be impossible to arrange the iron-core coils symmetrically in the corresponding phases. Consequently, the magnetic fluxes generated by the iron coils cause unbalanced inductances. If the inductances in a three-phase choke are unbalanced, as described above, it is impossible to output an ideal three-phase current, even if the three-phase current is input perfectly.

[0006] In conventional three-phase chokes (JP H02-203 507 A and WO 2014 / 033830 A1), the dimensions of the gaps (the thicknesses of the gaps) depend on the dimensions of commercially available gap elements. The number of turns and the cross-sectional area of ​​a coil can therefore be limited by the size of a gap element when determining the construction of the three-phase choke. The precision of the inductances in a three-phase choke depends on the precision of the thickness of a gap element. Since the precision of a gap element thickness is usually ±10%, the precision of the inductances in a three-phase choke also depends on it. It is also possible to produce a gap element with a desired size, although this increases the cost of the gap element.

[0007] To assemble a three-phase choke, the assembly of the core elements is performed individually, while the joining of some core elements to each other is preferably performed multiple times. A challenge arises from the difficulty in precisely controlling the dimensions of the gap. Furthermore, improving the precision of the gap element's thickness increases manufacturing costs.

[0008] A gap element is usually formed by stacking several steel sheets on top of each other to create a layer. A three-phase choke preferably has a section in which core elements come into contact with each other. It is also preferred to stack the steel sheets alternately to improve the precision of the contact section. Such processes were very complicated.

[0009] Furthermore, conventional three-phase chokes (JP H02-203 507 A and WO 2014 / 033830 A1) have a problem: a magnetic field leaks into the air space surrounding the coil because the coil is exposed to the outside. This leaked magnetic field can interfere with a pacemaker and heat any magnetic material around the choke. More recently, amplifiers, motors, and similar devices have tended to be driven by high-frequency switching. The frequency of high-frequency noise can therefore increase. It is thus conceivable that the influence of the leaked magnetic field could also become stronger.

[0010] Furthermore, conventional three-phase chokes (JP H02-203 507 A and WO 2014 / 033830 A1) have a problem: magnetic flux leaking from a gap causes eddy current loss in the coil, increasing the coil's losses because the coil is located close to the gap. A method for manufacturing a setup where the coil is located away from the gap can be provided to solve this problem. However, this method has a weakness: it increases weight and cost because the core and winding diameter of the coil become large.

[0011] The problem of unbalanced inductances can be solved by increasing the gap of only one central phase. However, increasing the gap allows a magnetic field to leak out further.

[0012] In chokes with conventional designs (JP H02-203507 A and WO 2014 / 033830 A1), the temperatures of the coil and core tend to become unbalanced due to the high thermal resistance between them. To eliminate this temperature imbalance, the entire coil can be resin-molded to bring the coil into close contact with the core. However, this increases the cost. Furthermore, to suppress noise generated by a gap, the design can be modified to reduce the magnetic flux density, and resin molding can be performed as described above. However, this also increases the cost.

[0013] Methods for solving the problems described above—inductance imbalance, magnetic field leakage due to an externally exposed coil, and gap size—include a technique similar to that described in JP 2008-177 500 A. It describes how inductances can be provided by supplying current to a control winding without a gap in the design. However, the technique has a drawback: it requires a control circuit to regulate the current passing through the control winding, resulting in unnecessary power consumption from the winding. Furthermore, the technique also suffers from magnetic field leakage into the surrounding area due to the control winding's external exposure.

[0014] The present invention was realized under such circumstances with the objective of providing a three-phase choke with gaps that prevents inductances from being unbalanced and a magnetic field from leaking outwards, and in which a control winding is unnecessary and a loss caused by leakage flux can be reduced.

[0015] To solve the problem described above, a three-phase choke according to claim 1 is provided.

[0016] According to a first aspect of an unclaimed embodiment, a three-phase choke is provided comprising: an outer circumferential iron core and at least three iron core coils which come into contact with or are attached to an inner surface of the outer circumferential iron core, wherein the at least three iron core coils have corresponding iron cores and corresponding windings wound around the iron cores, and gaps which can magnetically connect an iron core coil of the at least three iron core coils and an iron core coil adjacent to the one iron core coil, between the one iron core coil and the at least three iron core coils and the iron core coil adjacent to the one iron core coil.

[0017] According to a second aspect of an unclaimed embodiment, the number of at least three iron core coils in the first aspect of an unclaimed embodiment is a multiple of 3.

[0018] According to a third aspect of an unclaimed embodiment, the iron cores of the at least three iron core coils have multiple iron core units, and iron core unit gaps that can magnetically connect the multiple iron core units are formed between the multiple iron core units in the first or second aspect of an unclaimed embodiment.

[0019] According to a fourth aspect of an unclaimed embodiment, outer circumferential iron core gaps connecting the iron cores of the at least three iron core coils and the outer circumferential iron core are formed between the iron cores of the at least three iron core coils and the outer circumferential iron core in any one of the first to third aspects of an unclaimed embodiment.

[0020] According to a fifth aspect of an unclaimed embodiment, in any one of the first to fourth aspects of an unclaimed embodiment, the outer circumferential iron core has multiple outer circumferential iron core units.

[0021] According to a sixth aspect of an unclaimed embodiment, outer circumferential iron core unit gaps are formed between outer circumferential iron core units adjacent to each other of the several outer circumferential iron core units in the fifth aspect of an unclaimed embodiment.

[0022] According to a seventh aspect of an unclaimed embodiment, the at least three iron core coils are arranged rotationally symmetrically in any one of the first to sixth aspects of an unclaimed embodiment.

[0023] According to an eighth aspect of an unclaimed embodiment, the three-phase choke comprises: a first set having at least three iron core coils, and a second set having at least three other iron core coils at any one aspect of the first to seventh of an unclaimed embodiment.

[0024] According to a ninth aspect of an unclaimed embodiment, the three-phase choke has no fewer than three sets, each of which, according to the eighth aspect of an unclaimed embodiment, has three iron core coils.

[0025] According to a tenth aspect of an unclaimed embodiment, in any one of the first to ninth aspects of an unclaimed embodiment, a gap element, insulating paper or resin, which is a non-magnetic material, is inserted or filled into the gap of the three-phase choke.

[0026] According to an eleventh aspect of an unclaimed embodiment, in any one of the first to ninth aspects of an unclaimed embodiment, a gap element, insulating material or resin, which is a non-magnetic material, is inserted or filled into an interior of the outer circumferential iron core of the three-phase choke.

[0027] According to a twelfth aspect of the present invention, a three-phase choke is provided, comprising, among other things, an outer circumferential iron core and at least three iron core coils which come into contact with or are attached to an inner surface of the outer circumferential iron core, wherein the at least three iron core coils have corresponding iron cores and corresponding windings wound around the iron cores, wherein the three-phase choke further comprises intermediate coil iron cores which are arranged between the at least three iron core coils, and gaps which can magnetically connect the at least three iron core coils and the intermediate coil iron cores to one another, are formed between the at least three iron core coils and the intermediate coil iron cores.

[0028] According to a thirteenth aspect of the present invention, each of the intermediate coil iron cores has two surfaces that form an acute angle to each other, and the two surfaces are opposite corresponding iron core coils via the corresponding gaps in the twelfth aspect of the present invention.

[0029] According to a fourteenth aspect of the present invention, the number of at least three iron core coils in the twelfth or thirteenth aspect of the present invention is a multiple of 3.

[0030] According to a fifteenth aspect of the present invention, the iron cores of the at least three iron core coils have multiple iron core units, and iron core unit gaps, which can magnetically connect the multiple iron core units, are formed between the multiple iron core units at any one aspect of the twelfth to fourteenth aspects of the present invention.

[0031] According to a sixteenth aspect of the present invention, external circumferential iron core gaps, which can magnetically connect the iron cores of the at least three iron core coils and the external circumferential iron core, can be formed between the iron cores of the at least three iron core coils and the external circumferential iron core at any one aspect of the twelfth to fifteenth aspects of the present invention.

[0032] According to a seventeenth aspect of the present invention, the intermediate coil iron cores comprise multiple intermediate coil iron core units, and intermediate coil iron core unit gaps, which can magnetically connect the multiple intermediate coil iron core units, are formed between the multiple intermediate coil iron core units at any one aspect of the twelfth to sixteenth aspects of the present invention.

[0033] According to an eighteenth aspect of the present invention, as claimed, in any one of the twelfth to seventeenth aspects of the present invention, the outer circumferential iron core comprises several outer circumferential iron core units.

[0034] According to a nineteenth aspect of the present invention, outer circumferential iron core unit gaps are formed between outer circumferential iron core units adjacent to each other of the several outer circumferential iron core units in the eighteenth aspect of the present invention.

[0035] According to a twentieth aspect of the present invention, the three iron core coils are arranged rotationally symmetrically in any twelfth to nineteenth aspect of the present invention.

[0036] According to a twenty-first aspect of the present invention, the three-phase choke comprises: a first set comprising three iron core coils, and a second set comprising three other iron core coils at any one of the twelfth to twentieth aspects of the present invention.

[0037] According to a twenty-second aspect of the present invention, the three-phase choke has no fewer than three sets, each of which, according to the twenty-first aspect of the present invention, has three iron core coils.

[0038] According to a twenty-third aspect of the present invention, in any one of the twelfth to twenty-second aspects of the present invention, a gap element, insulating paper or resin, which is a non-magnetic material, is inserted or filled into the gap of the three-phase choke.

[0039] According to a twenty-fourth aspect of the present invention, in any one of the twelfth to twenty-second aspects of the present invention, a gap element, insulating material or resin, which is a non-magnetic material, is inserted or filled into an interior of the outer circumferential iron core of the three-phase choke.

[0040] According to a twenty-fifth aspect of the present invention, a motor drive device is provided which has the throttle according to any one of the twelfth to twenty-fourth aspects of the present invention.

[0041] According to a twenty-sixth aspect of the present invention, a machine is provided which has the motor drive device according to the twenty-fifth aspect of the present invention.

[0042] According to a twenty-seventh aspect of the present invention, a power conditioner is provided which has the throttle according to any one of the twelfth to twenty-fourth aspects of the present invention.

[0043] According to a twenty-eighth aspect of the present invention, a machine or apparatus is provided which includes the power conditioner according to the twenty-seventh aspect of the present invention.

[0044] These and other objects, features and advantages of the present invention will become clearer with reference to detailed descriptions of exemplary embodiments of the present invention, which are illustrated in the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a top view of a three-phase choke according to a first unclaimed embodiment, Fig. 1B is a cross-sectional view of the three-phase choke, which is in Fig. 1A illustrates Fig. 1C is a perspective view of the three-phase choke, which is in Fig. 1A illustrates Fig. Figure 2 is a cross-sectional view of a three-phase choke according to a second unclaimed embodiment, Fig. Figure 3A is a cross-sectional view of a three-phase choke according to the third unclaimed embodiment. Fig. 3B is a cross-sectional view of another three-phase choke according to a third unclaimed embodiment, Fig. 4 is a cross-sectional view of a three-phase choke according to a fourth unclaimed embodiment, Fig. 5 is a cross-sectional view of a three-phase choke according to a fifth embodiment of the present invention, Fig. Figure 6 is a cross-sectional view of a three-phase choke according to a sixth embodiment of the present invention, Fig. Figure 7 is a cross-sectional view of a three-phase choke according to a seventh unclaimed embodiment, Fig. Figure 8 is a cross-sectional view of a three-phase choke according to an eighth unclaimed embodiment, Fig. Figure 9 is a cross-sectional view of a three-phase choke according to a ninth unclaimed embodiment, Fig. Figure 10 is a cross-sectional view of a three-phase choke according to a tenth unclaimed embodiment, Fig. Figure 11 is a cross-sectional view of a three-phase choke according to an unclaimed example, Fig. Figure 12 is a top view of the three-phase choke according to another unclaimed example, Fig. 13A is a top view of a conventional three-phase choke, Fig. 13B is a view of the magnetic fluxes in the three-phase choke, which is in Fig. 13A illustrates, illustrates, Fig. 13C is a partially enlarged view of the Fig. 13B, Fig. Figure 14A is a cross-sectional view of a three-phase choke according to an eleventh unclaimed embodiment, Fig. 14B is a perspective view of the three-phase choke, which is in Fig. 14A illustrates Fig. 14C is a view of the magnetic fluxes in the three-phase choke, which is in Fig. 14A illustrates, illustrates, Fig. 14D is a partially enlarged view of the Fig. 14C, Fig. 15A is a view illustrating an alternative example of the eleventh unclaimed embodiment, Fig. 15B is a view illustrating another alternative example of the eleventh unclaimed embodiment, Fig. 15C is a view that illustrates yet another alternative example of the eleventh unclaimed embodiment, Fig. Figure 16A is a cross-sectional view of a three-phase choke according to a twelfth unclaimed embodiment, Fig. 16B is a view of the magnetic fluxes in the three-phase choke, which is in Fig. 16A illustrates, illustrates, Fig. 16C is a partially enlarged view of the Fig. 16B, Fig. 17 is a cross-sectional view of a three-phase choke according to a thirteenth embodiment of the present invention, Fig. 18A is a cross-sectional view of a three-phase choke according to a fourteenth unclaimed embodiment, Fig. 18B is a cross-sectional view of another three-phase choke according to the fourteenth unclaimed embodiment, Fig. Figure 18C is a cross-sectional view of yet another three-phase choke according to the fourteenth unclaimed embodiment, Fig. Figure 19 is a cross-sectional view of a three-phase choke according to a fifteenth embodiment of the present invention, Fig. Figure 20 is a cross-sectional view of a three-phase choke according to a sixteenth embodiment of the present invention, Fig. Figure 21 is a cross-sectional view of a three-phase choke according to a seventeenth embodiment of the present invention, Fig. 22 is a cross-sectional view of a three-phase choke according to an eighteenth unclaimed embodiment, Fig. 23 is a cross-sectional view of a three-phase choke according to a nineteenth unclaimed embodiment, Fig. 24A is a cross-sectional view of a three-phase choke according to yet another unclaimed embodiment, Fig. 24B is a cross-sectional view of another three-phase choke according to yet another unclaimed embodiment, Fig. 25 is a cross-sectional view of a three-phase choke according to yet another unclaimed embodiment, Fig. Figure 26 is a view illustrating a machine or device comprising a three-phase choke of the present invention, and Fig. Figure 27 is a view illustrating another machine or device having a three-phase choke of the present invention. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following drawings, similar elements are designated by similar reference numerals. The scale of the drawings is varied appropriately to facilitate understanding.

[0046] Fig. Figure 1A is a top view of a three-phase choke according to a first unclaimed embodiment. Furthermore, Fig. 1B a cross-sectional view of the three-phase choke, which is in Fig. 1A is illustrated, and Fig. 1C is a perspective view of the three-phase choke, which is in Fig. 1A is illustrated.

[0047] As in Fig. 1A, Fig. 1B and Fig. As illustrated in Figure 1C, a three-phase choke 5 has the following: an outer circumferential iron core 23 and iron core coils 31 to 33, each magnetically connected to the outer circumferential iron core 20. Fig. In 1A, the iron core coils 31 to 33 are arranged inside the outer circumferential iron core 20, which has a ring shape. The iron core coils 31 to 33 are spaced apart from each other circumferentially at regular intervals in the three-phase choke 5.

[0048] As can be seen from the drawings, the iron core coils 31 to 33 have the following: corresponding iron cores 41 to 43 extending radially, and corresponding windings 51 to 53 wound around the iron cores. The radially outer end of each of the iron cores 41 to 43 comes into contact with the outer circumferential iron core 20 or is formed from a single piece with the outer circumferential iron core 20.

[0049] Furthermore, the radially inner end of each of the iron cores 41 to 43 is located near the center of the outer circumferential iron core 20. Fig. In 1A and the like, the radially inner end of each of the iron cores 41 to 43 converges to the center of the outer circumferential iron core 20, and the leading-end angle of the radially inner end is approximately 120 degrees. The radially inner ends of the iron cores 41 to 43 are spaced apart from each other by gaps 101 and 103, which can magnetically connect the radially inner ends.

[0050] In other words, in the first embodiment, the radially inner end of the iron core 41 is spaced from each of the radially inner ends of the two adjacent iron cores 42, 43 by each of the gaps 101, 102. This also applies to the other iron cores 42, 43. The dimensions of the gaps 101 to 103 are to be equal to each other. In embodiments described below, illustrations of the gaps 101 to 103 can be omitted.

[0051] The three-phase choke 5 can be designed to be lightweight and simple because a central iron core, located in the middle of the three-phase choke 5 as described above, is unnecessary. Furthermore, the three iron-core coils 31 to 33 are surrounded by the outer circumferential iron core 20, and consequently, a magnetic field generated by the windings 51 to 53 does not leak out to the outside of the outer circumferential iron core 20. Since the columns 101 to 103 also have optional thicknesses, they can be arranged cost-effectively, and the choke is therefore more advantageous in terms of design than chokes with conventional structures.

[0052] Furthermore, the differences in magnetic path lengths between phases in the three-phase choke 5 are smaller than those in chokes with conventional designs. Therefore, an imbalance in inductances caused by differences in magnetic path lengths can be reduced.

[0053] Fig. Figure 2 is a cross-sectional view of a three-phase choke according to a second, unclaimed embodiment. A three-phase choke 5, which is in Fig. Figure 2 illustrates the following: an outer circumferential iron core 20 and iron core coils 31 to 36, each magnetically connected to the outer circumferential iron core 20 and similar to those described above. The iron core coils 31 to 36 comprise: corresponding iron cores 41 to 46 extending radially, and corresponding windings 51 to 56 wound around the iron cores.

[0054] The front end angle of the radially inner end of each of the iron cores 41 to 46 of the three-phase choke 5, which is in Fig. As illustrated in Figure 2, the angle is approximately 60 degrees. The radially inner ends of the iron cores 41 to 46 are spaced apart from each other by gaps 101 to 106, which can magnetically connect the radially inner ends. As described above, the three-phase choke 5 can have the iron core coils 31 to 36, the number of which is a multiple of 3.

[0055] It is evident that effects generally similar to those described above can also be obtained in the second embodiment. Furthermore, it is intended that in the second embodiment the number of iron-core coils 31 to 36 is a multiple of 3, and therefore that several iron-core coils exist for each phase. The cross-sectional area of ​​each of the iron-core coils can be reduced by connecting the multiple iron-core coils in parallel.

[0056] Fig. Figure 3A is a cross-sectional view of a three-phase coil according to a third, unclaimed embodiment. Iron cores 41 to 43, which extend radially into iron core coils 31 to 33 in a three-phase choke, which is in Fig. As illustrated in Figure 3A, each section has first iron core units 41a to 43a located on radially inner sides and second iron core units 41b to 43b located on radially outer sides. Iron core unit gaps 111 to 113, which magnetically connect the first iron core units 41a to 43a and the second iron core units 41b to 43b, are formed between the first iron core units 41a to 43a and the second iron core units 41b to 43b. Furthermore, the three-phase choke has 5 windings 51 to 53, each wound around both the first iron core units 41a to 43a and the second iron core units 41b to 43b.

[0057] Furthermore, Fig. 3B a cross-sectional view of another three-phase choke according to the unclaimed third embodiment. Iron cores 41 to 43 extending radially into iron core coils 31 to 33 in a three-phase choke, which is in Fig. As illustrated in Figure 3A, each of the three-phase chokes has first iron core units 41a to 43a located on radially inner sides and second iron core units 41b to 43b located on radially outer sides. Iron core unit gaps 111 to 113, which can magnetically connect the first iron core units 41a to 43a and the second iron core units 41b to 43b, are formed between the first iron core units 41a to 43a and the second iron core units 41b to 43b. Furthermore, a three-phase choke 5 has first windings 51a and 53a wound around the first iron core units 41a to 43a and second windings 51b to 53b wound around the second iron core units 41b to 43b.

[0058] In other words, the embodiments described in Fig. 3A and Fig. Figure 3B illustrates that each of the iron cores 41 to 43 has two iron core units arranged in a single row. Each of the iron core coils 31 to 33 has the iron core unit column 111 to 113 formed between the iron core units.

[0059] In the embodiments described in Fig. 3A and Fig. As illustrated in Figure 3B, iron core unit columns 111 to 113 and columns 101 to 103 are formed, and therefore the dimensions of the columns and iron core unit columns that the iron core coils 31 to 33 have can be reduced. Furthermore, the magnetic fluxes leaking out of columns 101 to 103 and iron core unit columns 111 to 113 can be reduced. It is estimated that each of the iron cores 41 to 43 can have three or more iron core units arranged in a single row.

[0060] Fig. Figure 4 is a cross-sectional view of a three-phase choke according to a fourth, unclaimed embodiment. Iron core coils 31 to 33 in a three-phase choke 5, which is in Fig. As illustrated in Figure 4, the following are present: iron cores 41' to 43' extending radially, and corresponding windings 51 to 53 wound around the iron cores. As in the embodiments described above, the radially inner ends of the iron cores 41' to 43' are adjacent to each other by the gaps 101 to 103.

[0061] In the fourth embodiment, corresponding outer circumferential iron core gaps 121 to 123 are formed between the radial outer ends of the iron cores 41' to 43' and an outer circumferential iron core 20, which can magnetically connect these outer ends. Heat is generated in the iron core coils 31 to 33 when the three-phase choke 5 is operated. The fourth embodiment prevents the transfer of heat generated by the iron core coils 31 to 33 to the outer circumferential iron core 20 because of the outer circumferential iron core gaps 121 to 123.

[0062] Fig. Figure 5 is a cross-sectional view of a three-phase choke according to a fifth embodiment of the present invention. Iron core coils 31 to 33 in a three-phase choke 5, which are in Fig. As illustrated in point 5, these are generally those who, with reference to Fig. 1 are similar. In the fifth embodiment, an outer circumferential iron core 20 has several, for example three, outer circumferential iron core units 21 to 23, which have an arc shape. In Fig. 5. The outer circumferential iron core unit 21 comes into contact with an iron core 41 or is formed as a single unit with the iron core 41. Similarly, the outer circumferential iron core units 22, 23 come into contact with iron cores 42, 43 or are each integrally formed with the iron cores 42, 43. In the embodiment described in Fig. As illustrated in Figure 5, the outer circumferential iron core 20 can be manufactured without difficulty, even if the outer circumferential iron core 20 is large.

[0063] Fig. Figure 6 is a cross-sectional view of a three-phase choke according to a sixth embodiment of the present invention. In the sixth embodiment, an outer circumferential iron core unit gap 61, which can magnetically connect an outer circumferential iron core unit 21 and an outer circumferential iron core unit 22, is formed between the outer circumferential iron core unit 21 and the outer circumferential iron core unit 22. Similarly, outer circumferential iron core unit gaps 62, 63, which magnetically connect an outer circumferential iron core unit 22 and an outer circumferential iron core unit 23 and an outer circumferential iron core unit 21 respectively, are formed between the outer circumferential iron core unit 22 and the outer circumferential iron core unit 23 and between the outer circumferential iron core unit 23 and the outer circumferential iron core unit 21 respectively.

[0064] In other words, each of the outer circumferential iron core units 21 to 23 is configured by each of the outer iron core unit columns 61 to 63. In such a case, the outer circumferential iron core unit columns 61 to 63 can be adjusted by adjusting the lengths of the outer circumferential iron core units 21 to 23. It is evident that, as a result, an imbalance of inductances in the three-phase choke 5 can be established.

[0065] A three-phase choke 5, which is in Fig. The three-phase choke shown in figure 6 differs from the three-phase choke shown in figure 5. Fig. Figure 5 illustrates this only with regard to the fact that it has the outer circumferential iron core unit gaps 61 to 63. In other words, in the fifth embodiment, the outer circumferential iron core unit gaps 61 to 63 are not formed between the adjacent outer circumferential iron core units 21 to 23. In the embodiments shown in Figure 5, the outer circumferential iron core unit gaps 61 to 63 are not formed between the adjacent outer circumferential iron core units 21 to 23. Fig. 5 and Fig. As illustrated in Figure 6, the outer circumferential iron core 20 can be manufactured without difficulty, even if the outer circumferential iron core 20 is large.

[0066] Fig. 7 is a cross-sectional view of a three-phase choke according to a seventh unclaimed embodiment. Since a three-phase choke 5, which is in Fig. Figure 7 illustrates, in general, the three-phase choke 5, which is in Fig. As illustrated in Figure 2, detailed descriptions of the three-phase choke 5 are omitted. Fig. 7 the dimensions of corresponding iron cores 41 to 46 and windings 51 to 56 in iron core coils 31 to 36 as well as columns 101 to 106 are the same as each other.

[0067] Furthermore, the iron-core coils 31 to 36 in the three-phase choke 5 are arranged rotationally symmetrically. It is therefore obvious that an imbalance of inductances caused by the arrangement of the six iron-core coils 31 to 36 in the three-phase choke 5, which is in Fig. 7 illustrates how this can be minimized. This also applies to the embodiment shown in Fig. Figure 1 illustrates the three iron core coils 31 to 33.

[0068] Furthermore, Fig. Figure 8 shows a cross-sectional view of a three-phase choke according to an eighth unclaimed embodiment. A three-phase choke 5, which is in Fig. As illustrated in Figure 8, this is generally the three-phase choke 5, which is in Fig. Figure 7 illustrates a similar situation. The iron cores 41, 43 and 45 in the three-phase choke 5, which is in Fig. However, as illustrated in Figure 8, they are wider than the iron cores 42, 44 and 46. Furthermore, the cross-sectional areas of the windings 51, 53 and 55, which are wound around the iron cores 41, 43 and 45, are smaller than those of the windings 52, 54 and 56, which are wound around the other iron cores 42, 44 and 46.

[0069] In other words, the three-phase choke 5, which is in Fig. Figure 8 illustrates a first set comprising three iron-core coils 31, 33, and 35, and a second set comprising three other iron-core coils 32, 34, and 36. Both the first and second sets alternately feature three of the six iron-core coils 31 to 36. The iron-core coils are arranged rotationally symmetrically in both the first and second sets.

[0070] In the case of the three-phase choke 5, which is in Fig. As illustrated in Figure 8, the dimensions of the iron cores and the cross-sectional areas and number of turns of the coils are intended to differ between the first and second sets. The dimensions of the column in the first set of the three-phase choke 5 may also be intended to differ from the dimensions of the column in the second set.

[0071] In the embodiment that is in Fig. As illustrated in Figure 8, two chokes with different properties can essentially be contained within a three-phase choke 5. In the embodiment shown in Figure 8, the chokes are arranged in a three-phase choke. Fig. As illustrated in Figure 7, two chokes with the same property can be contained in a three-phase choke 5. In the embodiments shown in Figure 7, two chokes with the same property can be contained in a three-phase choke 5. Fig. 7 and Fig. As illustrated in Figure 8, the installation space can be reduced because the two chokes, which have the same or different properties, can be contained within a single choke. It is obvious that inductance values ​​can be adjusted by connecting two chokes in series or parallel. Three or more chokes, which have different or the same properties—that is, the three or more sets described above—can be contained within a three-phase choke 5. It is evident that similar effects can be obtained in such a case as well.

[0072] Fig. Figure 9 is a cross-sectional view of a three-phase choke according to a ninth unclaimed embodiment. A three-phase choke 5, which is in Fig. As illustrated in 9, this is generally the three-phase choke 5, which is shown with reference to Fig. 1A illustrates a similar situation, which is why descriptions of the three-phase choke 5 are omitted. As in Fig. Figure 9 illustrates that a gap element 71, made of resin, is filled into the gap 101 to 103 in the three-phase choke 5.

[0073] In such a case, the gap element 71 can be produced by simply filling the gap 101 to 103 with resin and allowing the resin to harden. The gap element 71 can therefore be produced without further ado. A generally Y-shaped gap element 71, which corresponds to the gap element 71 that is in Fig. Figure 9 illustrates a similar process, and it can be pre-generated and inserted into columns 101 to 103 instead of filling with resin. In such a case, the gap element 71 suppresses vibrations of iron cores that come into contact with columns 101 to 103, and therefore noise from the iron cores can be reduced.

[0074] Furthermore, Fig. Figure 10 shows a cross-sectional view of a three-phase choke according to a tenth unclaimed embodiment. A three-phase choke 5, which is in Fig. As illustrated in 10, the three-phase choke 5 is generally used, which is shown with reference to Fig. As described in 1A, similar, which is why descriptions of the three-phase choke 5 are omitted. As in Fig. Figure 10 illustrates that an insulating material 72, made of resin, is filled into the interior of an outer circumferential iron core 20 in the three-phase choke 5.

[0075] In such a case, the insulating material 72 can also be readily produced by simply filling the interior of the outer circumferential iron core 20 with the resin and allowing the resin to harden. In such a case, the insulating material 72 suppresses vibrations of the iron core coils 31 to 33 and the outer circumferential iron core 20, thereby reducing generated noise. Furthermore, the temperature equilibrium between the iron core coils 31 to 33 and the outer circumferential iron core 20 can be maintained in the embodiment described in Fig. As illustrated in point 10, it should be promoted.

[0076] Fig. Figure 11 is a cross-sectional view of a three-phase choke according to an unclaimed example. Furthermore, Fig. 12 A top view of the three-phase choke according to an unclaimed example. A three-phase choke 5, which is in Fig. 11 and Fig. Figure 12 illustrates an outer circumferential iron core 20, which is generally hexagonal. The outer circumferential iron core 20 comprises three outer circumferential iron core units 24 to 26. The outer circumferential iron core units 24 to 26 are in contact with, or integrally formed with, iron cores 41 to 43. As illustrated in the drawings, the outer circumferential iron core units 24 to 26 consist only of even units.

[0077] As in Fig. 11 and Fig. As illustrated in Figure 12, the outer circumferential iron core 20 does not necessarily have a ring shape, as long as it has a shape that surrounds the iron core coils 31 to 33. Furthermore, an outer circumferential iron core 20 with a shape other than the hexagonal shape can be used. It is obvious to the person skilled in the art that some of the embodiments described above can be combined as appropriate.

[0078] Furthermore, Fig. 13A a top view of a three-phase choke, which is the Fig. 3A is similar. Fig. In the three-phase choke, the iron-core coils 31 to 33 are each formed from iron cores 41 to 43 and windings 51 to 53, and the gaps 101 to 103, which connect the adjacent iron-core coils 31 to 33, are formed between the adjacent iron-core coils 31 to 33. Furthermore, the iron cores 41 to 43 each have several iron-core units 41a, 41b, several iron-core units 42a, 42b, and several iron-core units 43a, 43b. The iron-core unit gaps 131 to 133, which can magnetically connect the iron-core units, are formed between the iron-core units.

[0079] Furthermore, Fig. 13B a ​​view of the magnetic fluxes in the three-phase choke, which is in Fig. 13A illustrates this. As in Fig. As illustrated in Figure 13B, there is a problem that leakage flows from the vicinity of the iron core unit gaps 131 to 133 penetrate into the windings 51 to 53 in their vicinity, causing eddy current losses to occur in the windings.

[0080] Fig. 13C is a partially enlarged view of the Fig. 13B. As in Fig. As illustrated in Figure 13C, the magnetic flux density B at locations PD and PE in the radially outer vicinity of windings 52 and 53 is relatively low, for example, 0.001 T. In contrast, the magnetic flux density B in the gap between adjacent iron core units 42a and 43a is 0.08 T or higher. The magnetic flux densities B at locations PB and PC in the iron core gaps 1320 and 1330 are also as high as 0.08 T or higher. Eddy current losses occur in windings at such locations, as described above.

[0081] Fig. Figure 14A is a cross-sectional view of a three-phase choke according to an eleventh unclaimed embodiment. Furthermore, Fig. 14B a perspective view of the three-phase choke, which is in Fig. 14A illustrates this.

[0082] As in Fig. 14A and Fig. As illustrated in Figure 14B, a three-phase choke 5 has the following: an outer circumferential iron core 20 and three iron-core coils 31 to 33 which come into contact with the outer circumferential iron core 20 or are attached to the inner surface of the outer circumferential iron core 20. Fig. In 14A, the iron core coils 31 to 33 are arranged inside the outer circumferential iron core 20, which has a hexagonal shape. The iron core coils 31 to 33 are spaced from each other circumferentially at regular intervals in the three-phase choke 5. The three-phase choke 5 is rotationally symmetrical. The outer circumferential iron core 20 can have a different polygonal or ring shape.

[0083] As can be seen from the drawings, the iron core coils 31 to 33 have the following: corresponding iron cores 41 to 43 extending radially, and corresponding windings 51 to 53 wound around the iron cores. The radially outer end of each of the iron cores 41 to 43 comes into contact with the outer circumferential iron core 20 or can be formed from a single piece with the outer circumferential iron core 20.

[0084] Furthermore, the radially inner end of each of the iron cores 41 to 43 is located near the center of the outer circumferential iron core 20. Fig. In 14A and the like, the radially inner end of each of the iron cores 41 to 43 converges to the center of the outer circumferential iron core 20, and the front end angle of the radially inner end is about 120 degrees.

[0085] In Fig. In 14A, three intermediate coil iron cores 81 to 83 are arranged between the iron core coils 31 to 33. In particular, the intermediate coil iron cores 81 to 83 are arranged near the radially inner ends of the iron cores 41 to 43 of the iron core coils 31 to 33. Fig. The intermediate coil iron cores 81 to 83 have the same shapes. The cross-sections of the intermediate coil iron cores 81 to 83 are pentagons, two sides of which are parallel to each other.

[0086] Furthermore, a gap 101, which can magnetically connect the intermediate coil iron core and the iron cores 41, 42, can be formed between the intermediate coil iron core 81 and the iron cores 41, 42. Similarly, a gap 102, which can magnetically connect the intermediate coil iron core 82 and the iron cores 42, 43, is formed between the intermediate coil iron core 82 and the iron cores 42, 43. A gap 103, which can magnetically connect the intermediate coil iron core 83 and the iron cores 43, 41, is formed between the intermediate coil iron core 83 and the iron cores 43, 41. The dimensions of gaps 101 to 103 are to be equal to each other. For embodiments described below, illustrations in columns 101 to 103 may be omitted.

[0087] Fig. 14C is a view of the magnetic fluxes in the three-phase choke, which is in Fig. 14A illustrates how comparisons between Fig. 14C and Fig. As can be seen in diagram 13B, leakage flows from the vicinity of gaps 101 to 103 are relatively weak and therefore do not penetrate much into the windings 51 to 53 in their vicinity. The occurrence of eddy current losses in the windings is thus prevented.

[0088] Furthermore, Fig. 14D a partially enlarged view of the Fig. 14C. Magnetic flux densities B at locations P1, P2 in the gap 102 on both sides of the intermediate coil iron core 82 are relatively high, such as 0.08 T or more. In contrast, magnetic flux densities B at locations P3, P4 in the radially outer vicinity of the windings 52, 53 are as low as 0.001 T.

[0089] Positions that are in Fig. 14D have a magnetic flux density B of 0.08 T or more, the only points P1, P2 in the gap 102 on both sides of the intermediate coil iron core 82. Compare between Fig. 14D and Fig. Evidence 13C can therefore show that the number of locations where leakage currents are generated near gap 102 is small, and that the leakage fluxes therefore do not penetrate much into winding 52 in its vicinity. In other words, gap 102 is formed between iron cores 42, 43 and the intermediate coil iron core 82, and consequently, the leaked magnetic fluxes are weak, thus suppressing eddy current losses occurring in windings 52, 53. The other gaps 101 and 103 have similar effects.

[0090] The Fig. Figures 15A to 15C are views illustrating an alternative example of the eleventh unclaimed embodiment and the Fig. 14A are similar. In Fig. In 15A, the cross-sections of the intermediate coil iron cores 81 to 83 are rectangular, and an opening 60 is formed between the intermediate coil iron cores 81 to 83. In such a case, the columns 101 to 103 are similar to those described above.

[0091] Furthermore, an intermediate coil iron core 84, which has an isosceles triangular shape, is additionally located in the opening 60 in the configuration shown in Fig. As illustrated in Figure 15B, columns similar to columns 101 to 103 are formed between the additional intermediate coil iron core 84 and the intermediate coil iron cores 81 and 83.

[0092] Furthermore, in Fig. In 15C, a single intermediate coil iron core 80 is arranged between iron core coils 31 to 33. As illustrated in the drawing, the columns 101 to 103 described above are formed between the intermediate coil iron core 80 and iron cores 41 to 43. As described above, even if the number of intermediate coil iron cores 81 is varied, similar effects can be obtained because the columns 101 to 103 are similar to those described above.

[0093] Fig. Figure 16A is a cross-sectional view of a three-phase choke according to a twelfth unclaimed embodiment. Fig. In 16A, the front-end angle of the radial inner end of each of the iron cores 41 to 43 is approximately 90 degrees. This results in the cross-sections of the intermediate coil iron cores 81 to 83 having an isosceles triangular shape. In other words, each of the intermediate coil iron cores 81 to 83 has two surfaces that form an acute angle with each other. The gaps 101 to 103, which can magnetically connect each of the two surfaces and the iron cores 41 to 43, are formed between the two surfaces and the iron cores 41 to 43.

[0094] Fig. 16B is a view of the magnetic fluxes in the three-phase choke, which is in Fig. 16A illustrates how comparisons between Fig. 16B and Fig. As can be seen in Figure 13B, the number of locations where leakage currents are generated from the vicinity of columns 101 to 103 is small, and therefore the leakage currents do not penetrate into windings 51 to 53 in their vicinity. The occurrence of eddy current losses is therefore prevented in the windings.

[0095] Fig. 16C is a partially enlarged view of the Fig. 16B. Magnetic flux densities B at locations P1, P2 in the gap 102 on both sides of the intermediate coil iron core 82 are relatively high, such as 0.08 T or more. In contrast, magnetic flux densities B at locations P3, P4 in the radially outer vicinity of the windings 52, 53 are as low as 0.001 T. Locations that are in Fig. 16C have a magnetic flux density B of 0.08 T or more, only the points P1, P2 in the gap 102 on both sides of the intermediate coil iron core 82. Effects similar to those described above can therefore also be obtained in the twelfth embodiment.

[0096] Furthermore, in the twelfth embodiment, the cross-sections of the intermediate coil iron cores 81 to 83 are isosceles triangular, and the areas of the gaps 101 to 103 are therefore larger than those of the eleventh embodiment. It is therefore evident that the twelfth embodiment is more efficient than the eleventh. The number of intermediate coil iron cores 81 to 83 can also be reduced.

[0097] Furthermore, Fig. Figure 17 shows a cross-sectional view of a three-phase choke according to a thirteenth embodiment of the present invention. A three-phase choke 5, which is in Fig. Figure 17 illustrates the following: an outer circumferential iron core 20 and iron core coils 31 to 36 similar to those described above. The iron core coils 31 to 36 have the following: corresponding iron cores 41 to 46 extending radially, and corresponding windings 51 to 56 wound around the iron cores.

[0098] The front end angle of the radially inner end of each of the iron cores 41 to 46 of the three-phase choke 5, which is in Fig. As illustrated in 17, the angle is approximately 60 degrees. Fig. The intermediate coil iron cores 81 to 86 have the same shapes. The cross-sections of the intermediate coil iron cores 81 to 86 are pentagons, two sides of which are parallel to each other. In a manner similar to that described above, gaps 101 to 106 (not illustrated), which can magnetically connect the intermediate coil iron cores 81 to 86 and the iron cores 41 to 46, are formed between the intermediate coil iron cores 81 to 86 and the iron cores 41 to 46. As described above, the three-phase choke 5 can have the iron core coils 31 to 36, the number of which is a multiple of 3.

[0099] It is evident that effects generally similar to those described above can also be obtained in the thirteenth embodiment. Furthermore, it is intended that in the thirteenth embodiment the number of iron-core coils 31 to 36 is a multiple of 3, and therefore several iron-core coils exist for each phase. The cross-sectional area of ​​each of the iron-core coils can be reduced by connecting the multiple iron-core coils in parallel.

[0100] Fig. Figure 18A is a cross-sectional view of a three-phase choke according to a fourteenth unclaimed embodiment. Inter-coil iron cores 81 to 83 of a three-phase choke 5, which are in Fig. As illustrated in Figure 18A, the following are present: corresponding first intermediate coil iron core units 81a to 83a, and corresponding second intermediate coil iron core units 81b to 83b. The first intermediate coil iron core unit 81a and the second intermediate coil iron core unit 81b are placed side by side. This also applies to the first intermediate coil iron core units 82a, 83a and the other second intermediate coil iron core units 82b, 83b.

[0101] Furthermore, the intermediate coil iron core unit gaps 131 to 133, which can magnetically connect the first intermediate coil iron core units 81a and 83a and the second intermediate coil iron core units 81b to 83b, are formed between the first intermediate coil iron core units 81a to 83a and the second intermediate coil iron core units 81b to 83b. It is intended that such a gap, as described above (in Fig. (18A or the like, not illustrated) is formed between the first intermediate coil iron core unit 81a and an iron core 41, and between the second intermediate coil iron core unit 81b and an iron core 42. Other columns 102 and 103 are to be formed in a similar manner.

[0102] Furthermore, Fig. Figure 18B shows a cross-sectional view of another three-phase choke according to the fourteenth unclaimed embodiment. In such a case, the intermediate coil iron cores 81 to 83 also have corresponding first intermediate coil iron core units 81a to 83a and corresponding second intermediate coil iron core units 81b to 83b, which are placed side by side. This also applies to the first intermediate coil iron core units 82a, 83a and the other second intermediate coil iron core units 82b, 83b. Furthermore, intermediate coil iron core unit gaps 131 to 133, which enable magnetic connections, and such gaps 101 to 103 are also formed similarly to those described above.

[0103] In other words, the configuration that is in Fig. Figure 18A illustrates a configuration in which the intermediate coil iron cores 81 to 83, which are in Fig. 14A illustrates that the planes are divided in half by planes parallel to columns 101 to 103. Furthermore, the configuration shown in Fig. Figure 18B illustrates a configuration in which the intermediate coil iron cores 81 to 83, which are in Fig. Figure 15A illustrates that the intermediate coil iron cores 81 to 83 are divided in half. The intermediate coil iron core units have the corresponding intermediate coil iron core unit gaps 131 to 133, which are formed between the intermediate coil iron core units 81a to 83a and 81b to 83b.

[0104] Furthermore, Fig. 18C shows a cross-sectional view of another three-phase choke according to the fourteenth unclaimed embodiment. In the configuration shown in Fig. As illustrated in 18C, the front-end units of the iron cores 41 to 43 are in the configuration shown in Fig. 18B is illustrated, with intermediate coil iron cores 81c to 83c replaced. The configuration shown in Fig. As illustrated in 18C, it therefore has first intermediate coil iron core units 81a to 83a, second intermediate coil iron core units 81b to 83b and third intermediate coil iron core units 81c to 83c.

[0105] As from Fig. As can be seen from Figure 18C, the first intermediate coil iron core units 81a to 83a and the second intermediate coil iron core units 81b to 83b have shapes that are symmetrical to each other. However, the third intermediate coil iron core units 81c to 83c have isosceles triangular shapes, which differ from those of the first intermediate coil iron core units 81a to 83a and the second intermediate coil iron core units 81b to 83b. Furthermore, the third intermediate coil iron core units 81c to 83c do not come into contact with any adjacent intermediate coil iron core units or with iron cores 41 to 43, and gaps are formed.

[0106] As described above, in the fourteenth embodiment both the gaps 101 to 103 and the intermediate coil iron core unit gaps 131 to 133 are formed, and therefore the dimension of each gap can be reduced at each position. Therefore, magnetic fluxes leaking out of the gaps can be reduced, and therefore eddy current losses in the windings caused by the magnetic leakage fluxes can be further reduced. It is appreciated that each of the intermediate coil iron cores 81 to 83 can have three or more intermediate coil iron core units arranged in a single row.

[0107] Fig. Figure 19 is a cross-sectional view of a three-phase choke according to a fifteenth embodiment of the present invention. Iron core coils 31 to 33 in a three-phase choke 5, which are in Fig. As illustrated in 19, these are generally those who, with reference to Fig. 14A are described similarly. In the fifteenth embodiment, an outer circumferential iron core 20 has several, for example three, outer circumferential iron core units 21 to 23. The outer circumferential iron core units 21 to 23 each have iron cores 41 to 43. In Fig. 19 The outer circumferential iron core units 21 to 23 come into contact with each other. In the embodiment described in Fig. As illustrated in Figure 19, the outer circumferential iron core 20 can be readily manufactured, even if the outer circumferential iron core 20 is large. In the embodiment shown in Figure 19, the outer circumferential iron core 20 can be manufactured without difficulty. Fig. As illustrated in Figure 17, the outer circumferential iron core 20 has several outer circumferential iron core units 21 to 26.

[0108] Fig. Figure 20 is a cross-sectional view of a three-phase choke according to a sixteenth embodiment of the present invention. In the sixteenth embodiment, an outer circumferential iron core unit gap 21a, which can magnetically connect an outer circumferential iron core unit 21 and an outer circumferential iron core unit 22, is formed between the outer circumferential iron core unit 21 and the outer circumferential iron core unit 22. Similarly, outer circumferential iron core unit gaps 21b, 21c, which can magnetically connect an outer circumferential iron core unit 22 and an outer circumferential iron core unit 23 and the outer circumferential iron core unit 23, respectively, are formed between the outer circumferential iron core unit 22 and an outer circumferential iron core unit 23 and between the outer circumferential iron core unit 23 and the outer circumferential iron core unit 21.

[0109] In other words, each of the outer circumferential iron core units 21 to 23 is configured by each of the outer iron core unit columns 21a to 21c. In such a case, the outer circumferential iron core unit columns 21a to 21c can be adjusted by adjusting the lengths of the outer circumferential iron core units 21 to 23. It is evident that, as a result, an imbalance of inductances in the three-phase choke 5 can be established.

[0110] A three-phase choke 5, which is in Fig. 20 illustrates this, which differs from the three-phase choke 5, which is shown in Fig. Figure 19 illustrates this only with regard to the fact that it has the outer circumferential iron core unit gaps 21a to 21c. In other words, in the fifteenth embodiment, the outer circumferential iron core unit gaps 21a to 21c are not formed between the adjacent outer circumferential iron core units 21 to 23. In the embodiments illustrated in Fig. 19 and Fig. As illustrated in Figure 20, the outer circumferential iron core 20 can be manufactured without difficulty, even if the outer circumferential iron core 20 is large.

[0111] Fig. Figure 21 is a cross-sectional view of a three-phase choke according to a seventeenth embodiment of the present invention. A three-phase choke 5, which is in Fig. As illustrated in 21, the three-phase choke 5 is generally used. Fig. Figure 4 illustrates a similar situation. The iron cores 41, 43 and 45 in the three-phase choke 5, which is in Fig. However, as illustrated in Figure 21, they are wider than the iron cores 42, 44 and 46. Furthermore, the cross-sectional areas of the windings 51, 53 and 55, which are wound around the iron cores 41, 43 and 45, are smaller than those of the windings 52, 54 and 56, which are wound around the other iron cores 42, 44 and 46.

[0112] In other words, the three-phase choke 5, which is in Fig. Figure 21 illustrates a first set comprising three iron-core coils 31, 33, and 35, and a second set comprising three other iron-core coils 32, 34, and 36. Both the first and second sets alternately feature three of the six iron-core coils 31 to 36. The iron-core coils are arranged rotationally symmetrically in both the first and second sets.

[0113] In the case of the three-phase choke 5, which is in Fig. As illustrated in Figure 21, the dimensions of the iron cores and the cross-sectional areas and number of turns of the coils are intended to differ between the first and second sets. The dimensions of the column in the first set of the three-phase choke 5 may be intended to differ from the dimensions of the column in the second set.

[0114] In the embodiment that is in Fig. As illustrated in Figure 21, two chokes with different properties can essentially be contained within a three-phase choke 5. In the embodiment shown in Figure 21, the chokes are arranged in a three-phase choke. Fig. As illustrated in Figure 4, two chokes with the same property can be contained in a three-phase choke 5. In the embodiments shown in Figure 4, two chokes with the same property can be contained in a three-phase choke 5. Fig. 17 and Fig. As illustrated in Figure 21, the installation space can be reduced because the two chokes, which have the same or different properties, can be contained within a single choke. It is evident that inductance values ​​can be adjusted by connecting two chokes in series or parallel. Three or more chokes, which have different or the same properties—that is, the three or more sets described above—can be contained within a three-phase choke 5. It is obvious that similar effects can be obtained in such a case as well.

[0115] Fig. 22 is a cross-sectional view of a three-phase choke according to an eighteenth unclaimed embodiment. A three-phase choke 5, which is in Fig. 22 is illustrated, in general, the three-phase choke 5, which is illustrated with reference to Fig. 14A is described similarly, which is why descriptions of the three-phase choke 5 are omitted. As in Fig. Figure 22 illustrates that a gap element 71, made of resin, is filled into the gap 101 to 103 in the three-phase choke 5.

[0116] In such a case, the gap element 71 can be produced by simply filling the gaps 101 to 103 with resin and allowing the resin to harden. The gap element 71 can therefore be easily produced. A gap element 71 that has a shape corresponding to the shape of the gap element 71 that is in Fig. Figure 22 illustrates a similar process, and it can be pre-generated and inserted into columns 101 to 103 instead of filling with resin. In such a case, the gap element 71 suppresses vibrations of iron cores that come into contact with columns 101 to 103 and intermediate coil iron cores 81 to 83, and therefore noise from the iron cores can be reduced. The gap elements 71 can be made of an insulating material.

[0117] Furthermore, Fig. 23 A cross-sectional view of a three-phase choke according to a nineteenth unclaimed embodiment. A three-phase choke 5, which is in Fig. 23 is illustrated, in general, the three-phase choke 5, which is illustrated with reference to Fig. 14A is described similarly, which is why descriptions of the three-phase choke 5 are omitted. As in Fig. Figure 23 illustrates that an insulating material 72, made of resin, is filled into the interior of an outer circumferential iron core 20 in the three-phase choke 5. The insulating material 72 can be a gap element.

[0118] In such a case, the insulating material 72 can also be readily produced by simply filling the interior of the outer circumferential iron core 20 with resin and allowing the resin to harden. In such a case, the insulating material 72 suppresses vibrations of the iron core coils 31 to 33, the outer circumferential iron core 20, and the intermediate coil iron cores 81 to 83, thereby reducing generated noise. Furthermore, the temperature equilibrium between the iron core coils 31 to 33, the outer circumferential iron core 20, and the intermediate coil iron cores 81 to 83 can be maintained in the embodiment described in Fig. 23 illustrates how to promote.

[0119] Fig. 24A and Fig. Figure 24B shows cross-sectional views of another three-phase choke according to yet another unclaimed embodiment. Fig. 24A and Fig. 24B are views that are generally in Fig. 3A and Fig. 3B are similar, therefore redundant descriptions for them are omitted. This also applies to the other drawings.

[0120] In Fig. 24A and Fig. In 24B, the three intermediate coil iron cores 81 to 83 are arranged between the iron cores 41 to 43 in the iron core coils 31 to 33. Specifically, the intermediate coil iron cores 81 to 83 are arranged near the radially inner ends of the iron cores 41 to 43. Furthermore, a gap 101, which magnetically connects the intermediate coil iron core 81 and the iron cores 41, 42, can be formed between the intermediate coil iron core 81 and the iron cores 41, 42. This also applies to the other intermediate coil iron cores 82, 83.

[0121] In such a case, both the gaps 101 to 103 and the iron core unit gaps 111 to 113 are formed, and the dimensions of each gap at each position can therefore be reduced. As described above, in the fourteenth embodiment, both the gaps 101 to 103 and the intermediate coil iron core unit gaps 111 to 113 are formed, and therefore the dimension of each gap at each position can be reduced. It is evident that, consequently, magnetic fluxes leaking out of the gaps can be reduced, and therefore eddy current losses in the windings caused by the magnetic leakage fluxes can be reduced.

[0122] Furthermore, Fig. 25 A cross-sectional view of a three-phase choke similar to the one in Fig. 4 according to yet another unclaimed embodiment. Iron core coils 31 to 33 in a three-phase choke 5, which is in Fig. As illustrated in Figure 25, the following are present: radially extending iron cores 41' to 43' and corresponding windings 51 to 53 wound around the iron cores. Three intermediate coil iron cores 81 to 83 are arranged between the iron core coils 41' to 43'. Furthermore, a gap 101, which can magnetically connect the intermediate coil iron core 81 and the iron cores 41, 42, can be formed between the intermediate coil iron core 81 and the iron cores 41, 42. This also applies to the other intermediate coil iron cores 82, 83.

[0123] In such a case, both columns 101 to 103 and the iron core unit columns 121 to 123 are formed, and the dimensions of each column per position can therefore be reduced. Furthermore, the effect of preventing the transfer of heat generated by the iron core coils to the outer circumferential iron cores can be maintained.

[0124] Fig. Figure 26 is a view illustrating a machine or device comprising a three-phase choke of the present invention. Fig. 26. A three-phase choke 5 is used in a motor drive device. The machine or device has such a motor drive device.

[0125] Fig. Figure 27 is a view illustrating another machine or device incorporating a three-phase choke of the present invention. Fig. 27. A power conditioner has a three-phase choke 5. The machine or device has such a power conditioner.

[0126] It is obvious that a motor drive device or the like, comprising the three-phase choke 5, can readily be provided in such a case. Combinations of some of the embodiments described above as suitable are within the scope of the present invention. Advantageous effects of the invention

[0127] Regarding the first unclaimed aspect, the differences in magnetic field lengths between phases are small compared to chokes with conventional designs, and therefore an imbalance of inductances caused by differences in magnetic path lengths can be reduced. Furthermore, most of the at least three iron-core coils are enclosed by the outer circumferential iron core, and the rate of magnetic field leakage from the windings to the outside of the outer circumferential iron core can be reduced. Additionally, since the gaps 101 to 103 have optional thicknesses, they can be arranged cost-effectively, and the choke is therefore more advantageous in design than chokes with conventional designs. The choke also has a design in which the gap is arranged to preserve inductances, thus eliminating the need for a control winding.The three-phase choke can therefore be easily and simply shaped.

[0128] The second, unclaimed aspect aims to ensure that the number of iron-core coils is a multiple of 3, and therefore multiple iron-core coils exist for each phase. The cross-sectional area of ​​each iron-core coil can be reduced by connecting the multiple coils in parallel. The number of turns in each iron-core coil can be reduced by connecting the multiple coils in series.

[0129] In the third, unclaimed aspect, both the gaps between the iron-core coils and the gaps between the multiple iron-core units are formed, and the dimension of each gap at each location can therefore be reduced. Therefore, magnetic fluxes leaking out of the gaps can be reduced, and therefore eddy current losses in the windings caused by the magnetic leakage fluxes can be reduced.

[0130] In the fourth unclaimed aspect, the outer circumferential iron core gaps are formed between the outer circumferential iron core and the iron core coils, and heat generated by the iron core coils is further prevented from being transferred to the outer circumferential iron core.

[0131] In the fifth unclaimed aspect, the outer circumferential iron core is divided into several units, and therefore the outer circumferential iron core can be readily manufactured, even if the outer circumferential iron core is large.

[0132] In the sixth unclaimed aspect, an imbalance of the inductances can be easily adjusted by adjusting the outer circumferential iron core unit gaps.

[0133] The seventh, unused aspect can minimize any imbalance in inductances caused by the arrangement of at least three iron core coils.

[0134] In the eighth, unused aspect, two chokes can be contained within a single choke, and the installation space can therefore be reduced if two chokes are preferred. Inductance values ​​can be adjusted by connecting the chokes in series.

[0135] In the ninth, unclaimed aspect, three chokes can be contained within a single choke, and the installation space can therefore be reduced when three or more chokes are preferred. Inductance values ​​can be adjusted by connecting the three or more chokes in series.

[0136] In the tenth, unused aspect, vibrations of the iron cores that come into contact with the fissures can be suppressed, and noise generated by the iron cores can be reduced.

[0137] The eleventh unclaimed aspect can promote the temperature equilibrium between the iron core coils and the outer circumferential iron core, and noise generated by the iron core coils and the outer circumferential iron core can be reduced.

[0138] In the twelfth aspect of the present invention, gaps are formed between the iron core coils and the intermediate coil iron cores, and each gap at each location is therefore narrower than in the case of the absence of intermediate coil iron cores. Leaking magnetic fluxes are therefore small. Since the distances between the gaps and the intermediate coils are long, magnetic fluxes penetrating the windings are further reduced, eddy currents generated in the windings are decreased, and therefore eddy current losses occurring in the windings can be reduced.

[0139] In the thirteenth aspect, since the areas of the gaps are increased, the magnetic flux densities of the gaps are reduced, thereby reducing magnetic fluxes that leak out, making magnetic fluxes that enter the windings small, and thus further reducing eddy current losses that occur in the windings.

[0140] The fourteenth aspect aims to ensure that the number of iron-core coils is a multiple of 3, and therefore multiple iron-core coils exist for each phase. The cross-sectional area of ​​each iron-core coil can be reduced by connecting the multiple coils in parallel. The number of turns in each iron-core coil can be reduced by connecting the multiple coils in series.

[0141] In the fifteenth aspect, both the gaps between the iron-core coils and the gaps between the iron-core units are formed, and the size of each gap at each location can be reduced. Therefore, magnetic fluxes leaking out of the gaps can be reduced, and consequently, eddy current losses in the windings caused by these magnetic leakage fluxes can be reduced.

[0142] In the sixteenth aspect, the outer circumferential iron core gaps are formed between the outer circumferential iron core and the iron core coils, and heat generated by the iron core coils is prevented from being transferred to the outer circumferential iron core.

[0143] In the seventeenth aspect, both the gaps between the iron-core coils and the inter-coil iron-core unit gaps are formed, and therefore the dimension of each gap can be reduced at each location. Therefore, magnetic fluxes leaking out of the gaps can be reduced, and therefore eddy current losses in the windings caused by the magnetic leakage fluxes can be further reduced.

[0144] In the eighteenth aspect of the present invention, the outer circumferential iron core is divided into several units, and therefore the outer circumferential iron core can be easily manufactured, even if the outer circumferential iron core is large.

[0145] In the nineteenth aspect, an imbalance of the inductances can be readily adjusted by adjusting the outer circumferential iron core unit gaps.

[0146] The twentieth aspect can minimize an imbalance in inductances caused by the installation of at least three iron core coils.

[0147] In the twenty-first aspect, two chokes can be contained within a single choke, thus reducing the installation space required when two chokes are preferred. Inductance values ​​can be adjusted by connecting the chokes in series.

[0148] In the twenty-second aspect, three chokes can be contained within a single choke, and the installation space can therefore be reduced when three or more chokes are preferred. Inductance values ​​can be adjusted by connecting the three or more chokes in series.

[0149] In the twenty-third aspect, vibrations of the iron cores that come into contact with the fissures can be suppressed, and noise generated by the iron cores can be reduced.

[0150] The twenty-fourth aspect can promote the temperature equilibrium between the iron core coils, the outer circumferential iron cores and the intermediate coil iron cores, and reduce noise generated by the iron core coils, the outer circumferential iron cores and the intermediate coil iron cores.

[0151] In the twenty-fifth to twenty-eighth aspects of the present invention, the motor drive device comprising the throttle, the machine comprising such a motor drive device, the power conditioner comprising the throttle, and the machine or device comprising such a power conditioner can be readily provided.

Claims

[1] Three-phase choke comprising the following: an outer circumferential iron core (20), wherein the outer circumferential iron core (20) comprises a plurality of outer circumferential iron core units (21 to 23), and at least three iron core coils (31 to 33) that come into contact with or are connected to an inner surface of the outer circumferential iron core (20), wherein the at least three iron core coils (31 to 33) comprise corresponding iron cores (41 to 43) and corresponding windings (51 to 53) wound around the iron cores (41 to 43), each of the iron cores (41 to 43) extending in a radial direction of the outer circumferential iron core (20), the three-phase choke further comprises a plurality of intermediate coil iron cores (81 to 83) arranged between the at least three iron core coils (31 to 33), and columns (101 to 103) which can magnetically connect the at least three iron core coils (31 to 33) and the intermediate coil iron cores (81 to 83) are formed between the at least three iron core coils (31 to 33) and the intermediate coil iron cores (81 to 83). [2] Three-phase choke according to claim 1, further comprising an additional intermediate coil iron core (84) arranged between the intermediate coil iron cores (81 to 83) and wherein gaps which can magnetically connect the additional intermediate coil iron core (84) and the intermediate coil iron cores (81 to 83) are formed between the additional intermediate coil iron core (84) and the intermediate coil iron cores (81 to 83). [3] Three-phase choke according to claim 11 or 2, wherein each of the intermediate coil iron cores (81 to 83) comprises two surfaces which form an acute angle to each other, and the two surfaces are opposite the corresponding iron core coils (31 to 33) via the corresponding gaps. [4] Three-phase choke according to one of claims 1 to 3, wherein the number of at least three iron core coils (31 to 33) is a multiple of 3. [5] Three-phase choke according to any one of claims 1 to 4, wherein the iron cores (41 to 43) of the at least three iron core coils (31 to 33) comprise a plurality of iron core units (41a to 43a, 41b to 43b), and Iron core unit gaps (111 to 113) that can magnetically connect the multitude of iron core units (41a to 43a, 41b to 43b) are formed between the multitude of iron core units (41a to 43a, 41b to 43b). [6] Three-phase choke according to claim 5, wherein the windings each comprise two windings (51a-53a, 51b-53b) wound around the iron core units (41a to 43a, 41b to 43b). [7] Three-phase choke according to any one of claims 1 to 6, wherein the intermediate coil iron cores (81 to 83) comprise intermediate coil iron core units (81a-81b, 82a-82b, 83a-83b) and wherein intermediate coil iron core unit gaps (131-133) which can magnetically connect the intermediate coil iron core units (81a-81b, 82a-82b, 83a-83b) are formed between the intermediate coil iron core units (81a-81b, 82a-82b, 83a-83b). [8] Three-phase choke according to one of claims 1 to 7, wherein outer circumferential iron core unit gaps (61 to 63) are formed between outer circumferential iron core units (21 to 23) adjacent to each other of the plurality of outer circumferential iron core units (21 to 23). [9] Three-phase choke according to one of claims 1 to 8, wherein the at least three iron core coils (31 to 33) are arranged rotationally symmetrically. [10] Three-phase choke according to any one of claims 1 to 9, wherein a gap element, insulating paper or resin (71) which is a non-magnetic material, is inserted or filled into the gap of the three-phase choke. [11] Three-phase choke according to any one of claims 1 to 9, wherein a gap element, insulating material or resin (72) which is a non-magnetic material is filled into the interior of the outer circumferential iron core (20) of the three-phase choke. [12] Three-phase choke according to one of the preceding claims, wherein each of the radially inner ends of the iron cores (41 to 43) converge to a center point of the outer circumferential iron core (20). [13] Motor drive device comprising the throttle according to any of the preceding claims. [14] Machine comprising the motor drive device according to claim 13. [15] Power conditioner comprising the throttle according to any one of claims 1 to 12. [16] Machine or apparatus comprising the power conditioner according to claim 15.

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