Construction of a single-phase choke coil

Abstract

Single-phase choke coil comprising an outer circumferential iron core (20); at least four iron cores (41 to 44) which are in contact with or connected to the inner surface of the outer circumferential iron core (20), wherein the four iron cores (41 to 44) extend radially and are arranged at equal intervals in the circumferential direction such that the angle formed by the center lines of any two adjacent iron cores (41 to 44) is 90 degrees, wherein the iron cores (41 to 44) have inner ends which converge radially towards the center of the outer circumferential iron core (20), the angle of their tip end being 90 degrees; coils (51 to 54) which are wound around each of the four iron cores (41 to 44), wherein magnetically coupling gaps (101 to 104) are formed between two adjacent iron cores of the at least four iron cores (41 to 44), separating the inner ends of the iron cores (41 to 44) from each other; and at least one additional iron core (45) having the cross-section of an isosceles triangle, arranged between two adjacent coils (51, 54), wherein the coils (51, 54) are in contact with the inner surface of the outer circumferential iron core (20) and are surrounded by the two associated iron cores (41, 44), the outer circumferential iron core (20) and the additional iron core (45).

Description

General state of the art 1. Field of invention

[0001] The present invention relates to the construction of a single-phase choke coil. 2. Description of the state of the art

[0002] Up to now, single-phase choke coils, such as those disclosed in patent publications JP 2000-077 242 A and JP 2008210 998 A, have presented the problem that the magnetic flux spreads from the vicinity of the gap, penetrates the windings, and generates an eddy current within them, consequently increasing the winding temperature. Therefore, current approaches involve either not arranging the windings near the gap or keeping them far away from it.

[0003] Fig. Figure 14A is a sectional view of a state-of-the-art single-phase choke coil. As shown in Fig. As shown in Figure 14A, the single-phase choke coil 100 comprises an approximately E-shaped first iron core 150, comprising two first outer leg sections 151, 152 and a first middle leg section 153 arranged between these first outer leg sections 151, 152, and an approximately E-shaped second iron core 160, comprising two second outer leg sections 161, 162 and a second middle leg section 163 arranged between these second outer leg sections 161, 162.

[0004] Furthermore, coils 171 and 172 are wound around the first middle leg section 153 and the second middle leg section 163, respectively. As shown in the figure, the two first outer leg sections 151 and 152 of the first iron core 150 and the two second outer leg sections 161 and 162 of the second iron core 160 are connected to each other. The first middle leg section 153 and the second middle leg section 163 are opposite each other, and a gap G is formed between them.

[0005] DE 10 2017 101 156 A1 discloses a three-phase choke with an outer circumferential iron core and several internally arranged iron-core coils. DE 10 2016 010 901 A1 describes, for example, a three-phase reactor. WO 2015 / 142354 A1 discloses, for example, an electromagnetic device with arms and a core. The arms are in direct contact with the core, so that no gaps are formed between them. US 2009 / 0 261 939 A1, for example, describes a three-phase inductor, and DE 25 08 395 A1 discloses a power supply for a charging circuit, wherein the secondary winding of the mains transformer is connected to a full-wave rectifier via a choke. Another example is known from DE 838 799 B, which describes a reactor for use in single-phase AC circuits. Brief description of the invention

[0006] Fig. 14B is an enlarged partial view of the Fig. The single-phase choke shown in 14A. The one in Fig. The magnetic flux shown by arrow A1 in Figure 14B spreads from the second middle leg section 163 near the gap G and reaches the first middle leg section 153. In contrast, the magnetic fluxes shown by arrows A2 to A4 do not travel from the second middle leg section 163 to the first middle leg section 153, but instead travel from the second middle leg section 163 to the second outer leg section 162. Since these magnetic fluxes A2 to A4 pass through coil 172, an eddy current loss occurs in the coil.

[0007] Fig. 14C is a view that describes the magnetic fluxes in Fig. Figure 14A shows a simulation of the single-phase choke coil. The connection areas between the first outer leg sections 151, 152 and the second outer leg sections 161, 162 correspond to the position of the gap G.

[0008] Furthermore, the first outer leg sections 151, 152 and the first middle leg section 153 are parallel to each other, and the second outer leg sections 161, 162 and the second middle leg section 163 are also parallel to each other. Therefore, the stray magnetic flux from the vicinity of the gap G is as shown in Fig. 14C shown slightly radiated to the connection areas between the first outer leg sections 151, 152 and the second outer leg sections 161, 162.

[0009] Fig. 14D is another view that considers the magnetic fluxes of the Fig. The single-phase choke shown in Figure 14A is shown. As in Fig. As shown in Figure 14D, the magnetic flux scattered from the vicinity of the gap G penetrates coils 171, 172 and flows easily into the adjacent outer leg sections. Therefore, the effect on reducing eddy current losses in the coils is limited even when coils 171, 172 are kept away from the vicinity of the gap G.

[0010] The present invention was made in light of these circumstances and has the objective of providing a single-phase choke coil in which the eddy current loss of the coils is reduced by the stray magnetic flux from the gap or the vicinity of the gap.

[0011] The present invention, for fulfilling the aforementioned problem, relates to a single-phase choke coil comprising an outer circumferential iron core and at least four iron cores that are in contact with or connected to the inner surface of the outer circumferential iron core. The four iron cores extend radially and are arranged at equal intervals in the circumferential direction such that the angle formed by the centerlines of any two adjacent iron cores is 90 degrees, wherein the iron cores have inner ends that converge radially towards the center of the outer circumferential iron core, the angle of their tip end being 90 degrees. The single-phase choke coil further comprises coils wound around each of the four iron cores, wherein magnetically coupling gaps are formed between two adjacent iron cores of the at least four iron cores, separating the inner ends of the iron cores from one another.The single-phase choke coil further comprises at least one additional iron core with the cross-section of an isosceles triangle, which is arranged between two adjacent coils, wherein the coils are in contact with the inner surface of the outer circumferential iron core and are surrounded by the two associated iron cores, the outer circumferential iron core and the additional iron core.

[0012] In the present invention, the magnetically coupled gaps are arranged near the center of the single-phase choke coil. Furthermore, the angle between the iron-core coils adjacent to each other across a gap is less than 180 degrees. Therefore, the stray magnetic flux from one iron core can easily pass into the nearest adjacent iron core, and the stray magnetic flux penetrating the coils can be reduced further than in the prior art. Since the coils can also be arranged further away from the gap, the proportion of stray magnetic flux from the gap penetrating the windings can be reduced. As a result, the eddy current loss inside the coils is reduced.

[0013] This task, features and advantages, as well as other tasks, features and advantages, will become even clearer from the detailed explanation of typical embodiments of the present invention shown in the accompanying drawings. Simple explanation of the drawings Fig. Figure 1A is a sectional view of a single-phase choke coil based on a first embodiment, which is not according to the invention. Fig. 1B is an enlarged partial view of the in Fig. 1A single-phase choke coil shown. Fig. 1C is a view that considers the magnetic fluxes in Fig. 1A shows the single-phase choke coil. Fig. 1D is another view that shows the magnetic fluxes of the Fig. 1A shows the single-phase choke coil. Fig. 2 is a view that shows the relationship between current and time. Fig. Figure 3 is a sectional view of a single-phase choke coil based on a second embodiment, not according to the invention. Fig. Figure 4 is a sectional view of a single-phase choke coil based on a third embodiment, not according to the invention. Fig. Figure 5A is a sectional view of a single-phase choke coil based on a fourth embodiment, which is not according to the invention. Fig. Figure 5B is a sectional view of another single-phase choke coil based on the fourth, non-inventive, embodiment. Fig. Figure 6 is a sectional view of another single-phase choke coil based on a fifth embodiment, which is not according to the invention. Fig. Figure 7 is a sectional view of a single-phase choke coil based on a sixth embodiment, which is not according to the invention. Fig. Figure 8 is a sectional view of a single-phase choke coil based on a seventh embodiment, which is not according to the invention. Fig. Figure 9 is a sectional view of a single-phase choke coil based on an eighth, non-inventive, embodiment. Fig. Figure 10 is a sectional view of a single-phase choke coil based on a ninth embodiment, which is not according to the invention. Fig. Figure 11 is a sectional view of a single-phase choke coil based on a tenth embodiment, which is not according to the invention. Fig. Figure 12 is a sectional view of a single-phase choke coil based on an eleventh embodiment, which is not according to the invention. Fig. Figure 13 is a view showing a machine or device containing a single-phase choke coil according to the present invention. Fig. Figure 14A is a sectional view of a state-of-the-art single-phase choke coil. Fig. 14B is an enlarged partial view of the Fig. 14A single-phase choke coil shown. Fig. 14C is a view that describes the magnetic fluxes in Fig. 14A shows the single-phase choke coil. Fig. 14D is another view that considers the magnetic fluxes of the Fig. 14A shows the single-phase choke coil. Fig. Figure 15 is a sectional view of a single-phase choke coil based on a twelfth embodiment, which is not according to the invention. Fig. Figure 16 is a sectional view of another single-phase choke coil based on the twelfth, non-inventive, embodiment. Fig. Figure 17A is a sectional view of a single-phase choke coil based on a thirteenth, non-inventive embodiment. Fig. Figure 17B is a sectional view of another single-phase choke coil based on the thirteenth, non-inventive embodiment. Fig. Figure 18 is a sectional view of a single-phase choke coil based on a fourteenth, non-inventive, embodiment. Fig. Figure 19 is a sectional view of a single-phase choke coil based on a fifteenth, non-inventive embodiment. Fig. Figure 20 is a sectional view of another single-phase choke coil based on the fifteenth, non-inventive, embodiment. Fig. Figure 21 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 22 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 23 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 24 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 25 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 26 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 27 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 28 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 29 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 30 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 31 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 32 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 33 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 34 is a sectional view of yet another, non-inventive, single-phase choke coil. Fig. Figure 35 is a schematic view showing a state-of-the-art single-phase choke coil. Fig. 36 is a schematic view showing a structure like the one in Fig. 1A shows the single-phase choke coil. Fig. Figure 37 is a sectional view of a single-phase choke coil based on an embodiment of the present invention. Detailed explanation

[0014] Non-inventive embodiments and an inventive embodiment are explained below with reference to the accompanying drawings. In the following drawings, identical elements are designated with the same reference numerals. The scale of these drawings has been adjusted accordingly for ease of understanding.

[0015] Fig. Figure 1A is a sectional view of a single-phase choke coil based on a first embodiment. Furthermore, Fig. 1B an enlarged partial view of the in Fig. 1A single-phase choke coil shown. Fig. 1C and Fig. 1D views are those that show the magnetic fluxes of the in Fig. 1A shows the single-phase choke coil.

[0016] As in Fig. Figure 1A shows a single-phase choke coil 5 comprising an outer circumferential iron core 20 and four iron core coils 31 to 34, which are magnetically coupled to each other with the outer circumferential iron core. Fig. In 1A, the iron core coils 31 to 34 are arranged on the inside of the octagonal outer circumferential iron core 20. The outer circumferential iron core 20 can also have a round or other polygonal shape. These iron core coils 31 to 34 are arranged at equal intervals along the circumference of the single-phase choke coil 5. It is sufficient for the iron core coils to be arranged circumferentially; they do not necessarily need to be equally spaced.

[0017] As can be seen from the drawing, the respective iron core coils 31 to 34 comprise radially extending iron cores 41 to 44 and coils 51 to 54 wound around these iron cores. The respective outer ends in the radial direction of the iron cores 41 to 44 are in contact with the outer circumferential iron core 20 or are formed integrally with the outer circumferential iron core 20.

[0018] Furthermore, the respective inner ends are arranged in the radial direction of the iron cores 41 to 44 near the center of the outer circumferential iron core 20. Fig. In 1A, etc., the inner ends of iron cores 41 to 44 converge radially towards the center of the outer circumferential iron core 20, and the angle of their tip end is approximately 90 degrees. The area of ​​the gap increases as the angle of their tip end becomes larger or smaller than 90 degrees, but saturation of the magnetic flux with a lower current becomes easier. The inner ends of iron cores 41 to 44 in the radial direction are separated from each other by magnetically coupling gaps 101 to 104.

[0019] In other words, in the first embodiment, the inner end of the iron core 41 is separated in the radial direction from the inner ends of the two adjacent iron cores 42 and 44 by means of gaps 101 and 104. This also applies to the other iron cores 42 to 44. Ideally, the dimensions of gaps 101 to 104 should be equal to each other, but they need not be. In embodiments described later, the labeling of gaps 101 to 104 and the iron core coils 31 to 34, etc., may be omitted.

[0020] Consequently, as in Fig. Figure 1A shows that a single, approximately X-shaped gap is formed by the columns 101 to 104 in the center of the single-phase choke coil 5. These columns 101 to 104 are also arranged at equal intervals around the circumference of the single-phase choke coil.

[0021] Since no central iron core is required in the middle section of the single-phase choke coil 5, the single-phase iron core 5 can be lightweight and simple in design. Furthermore, because the four iron core coils 31 to 34 are surrounded by the outer circumferential iron core 20, the magnetic field generated by the coils 51 to 54 does not extend beyond the outer circumferential iron core 20. Since the gaps 101 to 101 can be formed with any desired thickness at low cost, there are also design advantages compared to a choke coil with a conventional design.

[0022] Incidentally, they scatter in Fig. The magnetic fluxes shown by arrows B1 and B2 pass near the gap 104 and reach the other iron core 44. In contrast, the magnetic flux shown by arrow B3 passes through coils 53 and 54, resulting in an eddy current loss in coils 53 and 54.

[0023] The four iron cores 41 to 44 are arranged at equal intervals around the circumference. Therefore, the angle formed by the center lines of any two iron cores adjacent to each other via the gaps 101 to 104 is 90 degrees.

[0024] In contrast, the angle between two iron cores in the state of the art, as in Fig. 14A etc. shows 180 degrees. That is, the angle formed by the center lines of two adjacent iron cores is less than 180 degrees. Therefore, the scattered magnetic flux is less able to dissipate from the vicinity of the gap than in the prior art and easily reaches the nearest adjacent iron core.

[0025] Fig. 1C is a view that considers the magnetic fluxes in Fig. 1A shows the single-phase choke coil through a simulation. Fig. At 1C, the stray magnetic flux density decreases with increasing distance from slits 101 to 104. Furthermore, since the magnetic fluxes in Fig. 1C as in Fig. When 1A flows, the magnetic fluxes repel each other in the central region, and the magnetic flux density is lowest in the central region.

[0026] In the white areas in Fig. 1C, the magnetic flux scattered from columns 101 to 104 is at least 0.03 T. This also applies to Fig. 14C. As a comparison of Fig. 1C and Fig. As can be seen from 14C, the white areas are near the coils in the Fig. 1C smaller than the white areas in the Fig. 14C shown coils. In other words, since the proportion of locations where the magnetic flux density penetrating the coils is low is large, the stray magnetic flux penetrating the coils can be reduced further than in the prior art.

[0027] As from Fig. 1A and Fig. As can be seen in Figure 1D, coils 51 to 54 are also arranged near the inner surface of the outer circumferential iron core 20. That is, coils 51 to 53 are positioned away from the gaps 101 to 104. Consequently, the fraction of the stray magnetic flux from the vicinity of the gaps 101 to 104 that penetrates coils 51 to 54 is, as shown in Figure 1D, Fig. The 1D effect is noticeably small. It will be understood that, as a consequence, the eddy current loss inside the coils is reduced.

[0028] Furthermore, it is advantageous to reduce the thickness of the gap by increasing the cross-sectional area of ​​the iron cores 41 to 44. Since this reduces the stray magnetic flux near the gap and also allows for a reduction in the number of turns of the coils 51 to 54, the magnetic flux penetrating the interior of the coils can be further reduced.

[0029] In Fig. In 1A, coils 51 to 54 are wound such that the magnetic fluxes from the group of opposing iron-core coils 31, 33 flow towards the center of the single-phase choke coil, and the magnetic fluxes from the group of opposing other iron-core coils 32, 34 flow radially outwards from the center. However, coils 51 to 54 can also be wound such that the magnetic fluxes generated by all iron-core coils 31 to 34 are directed towards the center of the single-phase choke coil. In this case, the magnetic fluxes can cancel each other out.

[0030] Fig. Figure 2 is a view that shows the relationship between current and time. The transverse axis of Fig. Figure 2 shows the time, and the longitudinal axis shows the current, when the coils of the single-phase choke 5 were energized with a current for which a three-phase alternating current was subjected to full-wave rectification by a diode. Such a current shows a characteristic as in Fig. 2. Behavior shown. Each simulation shows the result when a current of Fig. 2.

[0031] Fig. Figure 3 is a sectional view of a single-phase choke coil based on a second embodiment. Fig. 3 Each of the iron cores 41 to 44 is provided near its end section on the inner side in the radial direction with a clockwise, approximately fan-shaped projection 41p to 44p. These projections 41p to 44p extend in the region between the end faces of the Fig. 1 adjacent coils. The shape of the tip end faces of the other iron cores 41 to 44, which are opposite these projections 41p to 44p, is also designed accordingly.

[0032] The distance between these projections 41p to 44p and the adjacent iron cores 41 to 44 is as in the case of Fig. 1. Furthermore, it is also in Fig. 3. The shape of the iron cores 41 to 44 is identical to each other. The projections 41p to 44p can also run in a counterclockwise direction.

[0033] In this case, the width of column 101 to 104 (the distance in the radial direction) will be greater than in the case of Fig. 1. It will be understood that the reactance is therefore increased. In the embodiment described in Fig. As shown in Figure 3, the iron cores 41 to 44 have the same shape, but they can also differ from one another. Furthermore, the gap can have a curved shape rather than a straight one. Such a case is also included within the scope of the present invention. This also applies to the embodiment of the invention discussed later.

[0034] Fig. Figure 4 is a sectional view of a single-phase choke coil based on a third embodiment. The in Fig. The single-phase choke coil shown in Figure 4 comprises an outer circumferential iron core 20 and, as previously described, iron core coils 31 to 36, which are magnetically coupled to each other with the outer circumferential iron core 20. Each of the iron core coils 31 to 36 comprises a radially extending iron core 41 to 46 and a coil 51 to 56 wound around this iron core. The tip angle of the respective end section on the inner side in the radial direction of the iron cores 41 to 46 of the in Figure 4 is given by the following formula: Fig. The angle of the single-phase choke coil 5 shown in Figure 4 is approximately 60 degrees. Furthermore, the end sections on the inside are separated from each other in the radial direction of the iron cores 41 to 46 by magnetically coupling gaps 101 to 106. In this way, the single-phase choke coil 5 can also comprise an even number of at least six iron core coils 31 to 36.

[0035] It is clear that the third embodiment generally achieves the same effect as described above. Furthermore, since in the third embodiment the number of iron-core coils 31 to 36 is set to an even number of at least six, there are multiple iron-core coils per phase. By connecting several iron-core coils in parallel, the cross-sectional area of ​​each coil can be reduced. By connecting several iron-core coils in series, the inductance can be increased.

[0036] Fig. Figure 5A is a sectional view of a single-phase choke coil based on a fourth embodiment. The iron core coils 31 to 34 are shown in the radial direction. Fig. The single-phase choke coil 5 shown in Figure 5A comprises the iron cores 41 to 44 each comprising a first iron core section 41a to 44a positioned on the inside in the radial direction, a third iron core section 41c to 44c positioned on the outside in the radial direction, and a second iron core section 41b to 44b positioned between the first iron core section 41a to 44a and the third iron core section 41c to 44c.

[0037] A magnetically coupled first iron core gap 111a to 114a is formed between the first iron core section 41a to 44a and the second iron core section 41b to 44b. Likewise, a magnetically coupled second iron core gap 111b to 114b is formed between the second iron core section 41b to 44b and the third iron core section 41c to 44c. Furthermore, the single-phase choke coil 5 comprises common coils 51 to 54 wound around the second iron core sections 41b to 44b and the third iron core sections 41c to 44c. The coils 51 to 54 may also be wound around the first iron core sections 41a to 44a.

[0038] Since the gap, which was originally only gap 101 with respect to an iron core, for example iron core 41, is in this case divided into gap 101, the first iron core section gap 111a and the second iron core section gap 111b, the thickness per gap becomes small. In this case, the gap thickness is the gap 101 after the division of the gap, the distance between the first iron core section 41a and the second iron core section 41b and the distance between the second iron core section 41b and the third iron core section 41c.

[0039] Since the thickness of the gaps per position becomes small in the fourth embodiment, the stray magnetic fluxes from the gaps also become small. Because the iron cores 41 to 44 are formed by the first iron core section 41a to 44a, the second iron core section 41b to 44b, and the third iron core section 41c to 44d, the single-phase choke coil 5 can be easily assembled. Consequently, in the Fig. In the embodiment shown in 5A, it is not necessary to divide the outer circumferential iron core 20. Naturally, each of the iron cores 41 to 44 can be formed from two or more iron core sections arranged in a row.

[0040] Fig. Figure 5B is a sectional view of another single-phase choke coil based on the fourth embodiment. Fig. 5B are in the range of columns 101 to 104 of Fig. 1A Additional iron cores 41d to 44d are arranged. The cross-section of the additional iron cores 41d to 44d is fan-shaped. The cross-section of the additional iron cores 41d to 44d can also have the shape of an isosceles triangle.

[0041] The end section on the inner side in the radial direction of the iron cores 41 to 44 is formed by two pointed end faces. As in Fig. As shown in Figure 5B, each of the two planar surfaces of the additional iron cores 41d to 44d and the tip end face of the adjacent iron core are parallel to each other. Furthermore, magnetically coupling gaps 101a to 104a and 101b to 104b are formed between the planar surfaces of the additional iron cores 41c to 44d and the tip end faces of the iron cores 41 to 44. It is clear that the angle formed by the two tip end faces of the iron cores 41 to 44 in Fig. 5B form, which is less than 60 degrees.

[0042] In Fig. 5B, the number in column eight is twice the number in column 1. Fig. In the case shown in Figure 1A, the thickness of the gap per position, i.e., the distance between the flat surfaces of the additional iron cores 41d to 44d and the tip end faces of the iron cores 41 to 44, can consequently be halved, thus reducing the stray magnetic flux.

[0043] Fig. Figure 6 is a sectional view of a single-phase choke coil based on a fifth embodiment. The iron core coils 31 to 34 of the in Fig. The single-phase choke coil 5 shown in Figure 6 comprises radially extending iron cores 41 to 44 and coils 51 to 54 wound around these iron cores. The end sections on the inside in the radial direction of the individual iron cores 41 to 41 are adjacent to each other via gaps 101 to 104, as in the embodiments described above.

[0044] In the fifth embodiment, magnetically coupled outer circumferential iron core gaps 111c to 114c are formed between the end sections on the outside in the radial direction of the iron cores 41 to 44 and the outer circumferential iron core 20. During operation of the single-phase choke coil 5, heat is generated at the iron core coils 31 to 34. Since the outer circumferential iron core gaps 111c to 114c are formed in the fifth embodiment, the heat generated by the iron core coils 31 to 34 has difficulty reaching the outer circumferential iron core 20.

[0045] Fig. Figure 7 is a sectional view of a single-phase choke coil based on a sixth embodiment. The iron-core coils 31 to 34 of the in Fig. The single-phase choke coil 5 shown in section 7 is the one referred to in relation to Fig. 1 explained in general the same way. In the sixth embodiment, the outer circumferential iron core 20 is formed by several, for example four, outer circumferential iron core sections 21 to 24. In Fig. 7. The outer circumferential iron core section 21 is in contact with the iron core 41 or is formed integrally with it. The outer circumferential iron core sections 22 to 24 are also each in contact with the iron cores 42 to 44 or are formed integrally with them. In the case of the Fig. In the embodiment shown in Figure 7, such an outer circumferential iron core 20 can also be easily manufactured even if the outer circumferential iron core 20 is large in format.

[0046] Fig. Figure 8 is a sectional view of a single-phase choke coil based on a seventh embodiment. In the seventh embodiment, a magnetically coupled outer-circumferential iron core section gap 61 is formed between the outer-circumferential iron core section 21 and the outer-circumferential iron core section 22. Likewise, magnetically coupled outer-circumferential iron core section gaps 62 to 64 are formed between the outer-circumferential iron core section 22 and the outer-circumferential iron core section 23, between the outer-circumferential iron core section 23 and the outer-circumferential iron core section 24, and between the outer-circumferential iron core section 24 and the outer-circumferential iron core section 21.

[0047] In other words, the outer circumferential iron core sections 21 to 24 are arranged one below the other via iron core outer circumferential section gaps 61 to 64. In such a case, the outer circumferential iron core section gaps 61 to 64 can be regulated by adjusting the length of the outer circumferential iron core sections 21 to 24. It will be understood that, as a result, the imbalance of the inductance of the single-phase choke coil 5 can be regulated.

[0048] The in Fig. The single-phase choke coil 5 shown in Figure 8 differs from the one in Figure 8. Fig. The only difference in the single-phase choke coil shown in Figure 7 is that it has the outer circumferential iron core section gaps 61 to 64. In other words, in the sixth embodiment, no outer circumferential iron core section gaps 61 to 64 are formed between the adjacent outer circumferential iron core sections 21 to 24. In the Fig. 7 and Fig. In the embodiments shown in Figure 8, such an outer circumferential iron core 20 can also be easily manufactured even if the outer circumferential iron core 20 is large in format.

[0049] Fig. Figure 9 is a sectional view of a single-phase choke coil based on an eighth embodiment. Since the in Fig. 9 single-phase choke coil shown 5 of the in Fig. Since the single-phase choke coil 5 shown in 1A is generally the same, a detailed explanation is omitted. However, in Fig. 9. The cross-sectional area of ​​coils 51, 54 of iron core coils 31, 34 is larger than the cross-sectional area of ​​coils 52, 53 of iron core coils 32, 33. Furthermore, the iron cores 41, 44 of iron core coils 31, 34 are narrower than the iron cores 42, 43 of iron core coils 32, 33. The dimensions of columns 101 to 104 are identical.

[0050] In other words, the single-phase choke coil comprises 5 as in Fig. Figure 9 shows a first group consisting of two iron-core coils 31, 34 and a second group consisting of the other two iron-core coils 32, 33. The first group and the second group each contain two adjacent iron-core coils from the four iron-core coils 31 to 34. In the Fig. In the single-phase choke coil 5 shown in Figure 9, the dimensions of the iron cores, as well as the cross-sectional area and the number of turns of the coils, are designed to differ between the first and second groups. The dimensions of the gaps in the first group of the single-phase choke coil 5 can also be designed to differ from the dimensions of the gaps in the second group.

[0051] Therefore, during the in Fig. In the embodiment shown in Figure 9, two choke coils with different properties are effectively incorporated into a single-phase choke coil 5. Consequently, the space required for two choke coils with different properties can be reduced. It will be understood that the inductance value can be regulated by connecting the two choke coils in series or in parallel with each other.

[0052] Furthermore, Fig. Figure 10 shows a sectional view of a single-phase choke coil based on a ninth embodiment. The in Fig. The single-phase choke coil 5 shown in 10 is the one in Fig. The single-phase choke coil 5 shown in Figure 4 is generally the same. However, the iron cores 41, 42 of the in Fig. The single-phase choke coil 5 shown in Figure 10 is wider than the other iron cores 45, 46, and the iron cores 45, 46 are wider than the other iron cores 43, 44. Furthermore, the cross-sectional area of ​​the coils 51, 52 wound around the iron cores 41, 42 is smaller than the cross-sectional area of ​​the coils 55, 56 wound around the other iron cores 45, 46, and the cross-sectional area of ​​the coils 55, 56 is smaller than the cross-sectional area of ​​the coils 53, 54 wound around the other iron cores 43, 44.

[0053] Consequently, the single-phase choke coil comprises 5 as in Fig. Figure 10 shows a first group formed from the two iron core coils 31, 32, a second group formed from two other iron core coils 33, 34, and a third group formed from yet other iron core coils 35, 36. The first to third groups each comprise two adjacent iron core coils of the six iron core coils 31 to 36.

[0054] At the in Fig. In the single-phase choke coil 5 shown in Figure 10, the dimensions of the iron cores, the cross-sectional area, and the number of turns of the coils are designed to differ between the first and third groups. The dimensions of the gap in the first group of the single-phase choke coil 5 can also be designed to differ from the dimensions of the gaps in the other groups. It will be understood that, due to such a design, the same effect as in the Fig. The result is obtained as shown in the embodiment 9. It is also possible to incorporate four or more choke coils, that is, four or more of the aforementioned groups, whose properties differ or are the same, into a single single-phase choke coil 5. It will be clear that the same effect is obtained in this case as well.

[0055] Fig. Figure 11 is a sectional view of a single-phase choke coil based on a tenth embodiment. Since the in Fig. 11 single-phase choke coil 5 shown with reference to Fig. Since the single-phase choke coil explained in section 1A is generally the same, a repeated explanation is omitted. As in Fig. Figure 11 shows that a gap material 71 made of a resin is filled into columns 101 to 104 of the single-phase choke coil 5.

[0056] In this case, the cleft material 71 can be formed by simply filling the gaps 101 to 104 and hardening. Therefore, the cleft material 71 can be easily formed. It is also possible to pre-form a cleft material 71 with an approximate X-shape, as shown in Fig. to form the form shown in Figure 11, or an L-shape or a plate shape, and to insert this fusing material 71 into the gaps 101 to 104 instead of filling them with resin. Since the fusing material in such a case suppresses vibrations of the iron cores in contact with the gaps 101 to 104, the noise generated by the iron cores is reduced. It will be clear that also with regard to the in Fig. 5A shown iron core section gap and the one in Fig. In the outer circumferential iron core section gap shown in Figure 8, a splitting material can be formed just as easily by filling it with resin, and the same effect can be obtained.

[0057] Furthermore, Fig. Figure 12 shows a sectional view of a single-phase choke coil based on an eleventh embodiment. Since the in Fig. 12 single-phase choke coil 5 shown with reference to Fig. Since the single-phase choke coil 5 explained in section 1A is generally the same, a repeated explanation is omitted. As in Fig. Figure 12 shows the inner area of ​​the outer circumference iron core 20 filled with an insulating material 72 made of resin.

[0058] In this case, too, the insulating material 72 can be easily formed by filling the inner area of ​​the outer circumferential iron core 20 with the resin and allowing it to harden. In such a case, any resulting interference noise can be reduced, since the insulating material 72 suppresses vibrations of the iron core coils 31 to 34 and the outer circumferential iron core 20. Furthermore, in the Fig. In the embodiment shown in Figure 12, the thermal equilibrium between the iron core coils 31 to 34 and the outer circumferential iron core 20 is promoted.

[0059] Fig. 15 and Fig. Figure 16 shows sectional views of a single-phase choke coil based on a twelfth embodiment. These drawings depict an approximately square single-phase choke coil 5. As shown, the opposing iron cores 42 and 44 have the same shape as described above.

[0060] In contrast, at the tips of the opposing iron cores 41, 43, a broadened section 41e, 43e is formed, which is wider than the main section of the iron core 41, 43. The shape of these broadened sections 41e, 43e corresponds to part of a rhombus shape. However, the broadened sections 41e, 43e can also have a different shape.

[0061] As shown in the drawing, magnetically coupling gaps 101 to 104 are formed between the widened sections 41e, 43e of the iron cores 41, 43 and the iron cores 42, 44. The total length of the Fig. Columns 101 to 104 shown in Figure 15 are longer than the total column length of another choke coil with the same shape that does not have widened sections. Consequently, it is possible to increase the inductance by extending the total column length.

[0062] At the in Fig. In the single-phase choke coil 5 shown in Figure 16, the opposing iron cores 41, 43 are wider across their entirety than the opposing other iron cores 42, 44. Therefore, in Fig. 16 the tips of the opposing iron cores 41, 43 are flat and an additional gap 105 is formed between the iron cores 41, 43.

[0063] Therefore, the total length of columns 101 to 104 and the additional column 105 in the Fig. The single-phase choke coil 5 shown in Figure 16 is longer than the total length of the column of a choke coil 5 where the width of the iron cores 41, 43 is equal to the width of the iron cores 42, 44. Likewise, in this case, it becomes possible to increase the inductance.

[0064] Furthermore, Fig. 17A and Fig. 17B Sectional views of a single-phase choke coil based on a thirteenth embodiment. The in Fig. 17A and Fig. The choke coil 5 shown in 17B is the one in Fig. The choke coil 5 shown in 15 is generally the same.

[0065] But in Fig. In 17A, the widened sections 41e, 43e are designed so that they can be separated from the main sections of the iron cores 41, 43. However, the widened sections 41e, 43e are in contact with the main sections of the iron cores 41, 43, and no gap is formed between them.

[0066] In this case, the coils 51, 53 can be wound around the main sections of the iron cores 41, 43 in a state where the widened sections 41e, 43e have been removed. The winding of the coils 52, 54 around the iron cores 42, 44 is carried out as usual. Afterwards, the widened sections 41e, 43e are inserted from above, resulting in a configuration as described in Fig. The choke coil 5 shown in 15 can be formed.

[0067] It is difficult to wind the coils around the iron cores 41, 43 when the widened sections 41e, 43e are in an unfinished state. It will therefore be understood that the assembly of the choke coil 5 is difficult when described in Fig. The setup shown in 17A can be easily carried out.

[0068] Likewise, in Fig. 17B The iron cores 41, 43 are designed in such a way that they can be removed from the outer circumferential iron core 20. The iron cores 41, 43 and the outer circumferential iron core 20 are in contact with each other, and no gap is formed between them.

[0069] In this case, the iron cores 41, 43 are removed from the choke coil 5 and the coils 51, 53 are wound around the base end sections of the iron cores 41, 43. The winding of the coils 52, 54 around the iron cores 42, 44 is carried out as usual. Then the iron cores 41, 43 with the coils 51, 53 are inserted from above, resulting in a configuration as described in Fig. The choke coil 5 shown in Figure 15 can be manufactured. It will be clear that the choke coil 5 is also assembled just as easily in this case.

[0070] Furthermore, Fig. 18 a sectional view of a single-phase choke coil based on a fourteenth embodiment. Fig. 18 is a Fig. 1 corresponding view. But in Fig. 18 are in Fig. The coils 52 and 54 shown in section 1 are eliminated. Consequently, in Fig. 18 iron cores 41, 43 with coils 51, 53 and iron cores 42, 44 without coils arranged alternately.

[0071] It is also possible with the other choke coils discussed above (5) to remove some of the iron cores from the coils. However, in this case, it is not absolutely necessary for the coils with iron cores and the coils without iron cores to be arranged alternately.

[0072] Furthermore, Fig. 19 and Fig. 20 sectional views of a single-phase choke coil based on a fifteenth embodiment. In the Fig. In the choke coil 5 shown in Figure 19, iron cores 41 and 43 with a widened section 41e and 43e formed from a portion of a rhombus shape are positioned opposite each other. Coils 51 and 53 are wound around these iron cores 41 and 43. The iron cores 41 and 43 are not divided but are single, unified elements.

[0073] Each of the other iron cores 42, 44 is formed from a U-shaped section 42h, 44h and a receiving area 42g, 44g enclosed within the U-shaped section 42h, 44h. Magnetically coupling gaps are formed between the iron cores 42, 44 and the sides of the widened sections 41e, 43e of the iron cores 41, 43. Fig. 19 The iron cores 41, 43 with the widened sections 41e, 43e and the other iron cores 42, 44 are arranged alternately one another.

[0074] The in Fig. The choke coil 5 shown in 20 is the one in Fig. The 19 shown are generally the same. However, the form of the in Fig. The shape of the iron cores shown in 20, 42, 44 differs from that of the ones in Fig. 19 iron cores shown 42, 44. The in Fig. The 20 iron cores 42, 44 shown are formed from a central section 42i, 44i and side sections 42j, 42k, 44j, 44k coupled to the two sides of the central section.

[0075] As in Fig. 19 and Fig. Figure 20 shows that the choke coil 5 is axially symmetrical, and the iron cores 41, 43 with the widened sections 41e, 43e and the iron cores 42, 44 with the other shape can be arranged alternately. Furthermore, coils can also be wound around the iron cores 42, 44. Alternatively, coils can be wound only around the iron cores 42, 44, and coils 51, 53 can be omitted. Finally, a portion of the iron cores 42, 44 can also be separable into several elements as described above.

[0076] Incidentally, Fig. 21 a sectional view of another single-phase choke coil. As in Fig. Figure 21 shows that the single-phase choke coil 5 comprises an outer circumferential iron core 20 and four iron core coils 31 to 34, which are magnetically coupled to each other with the outer circumferential iron core 20. Furthermore, a square central iron core 80 is arranged in the center of the single-phase choke coil 5. It is not necessary for the central iron core 80 to be square, but it is preferably axially symmetric or rotationally symmetric. It is sufficient if the iron core coils are arranged circumferentially; it is not necessary for them to be equally spaced.

[0077] As can be seen from the drawing, the respective iron core coils 31 to 34 comprise radially extending iron cores 41 to 44 and coils 51 to 54 wound around these iron cores. The end section on the outside in the radial direction of each iron core 41 to 44 is in contact with the outer circumferential iron core 20 or is formed integrally with the outer circumferential iron core 20.

[0078] Furthermore, the respective end sections are positioned on the inside in the radial direction of the iron cores 41 to 44 near the center of the outer circumferential iron core 20. Fig. 21 The respective end sections on the inner side of the iron cores 41 to 44 are flat in the radial direction. Furthermore, the end sections on the inner side of the iron cores 41 to 44 are adjacent to the central iron core 80 in the radial direction via magnetically coupled gaps 101 to 104. The dimensions of the gaps 101 to 104 are identical.

[0079] Since in this case the four iron-core coils 31 to 34 are surrounded by the outer circumferential iron core 20, the magnetic field generated by the coils 51 to 54 does not spread outside the outer circumferential iron core 20. Furthermore, the choke coils described later, which enclose the central iron core, generally exhibit the same effects as the choke coils described previously, which do not have a central iron core 80.

[0080] Furthermore, the in Fig. The choke coil shown in Figure 21 and the other choke coils described later demonstrate that the inductance can be regulated by changing the dimensions of the central iron core 80. This means that, since the gaps can be formed in any desired thickness at low cost, there are also design advantages compared to a choke coil with a conventional structure.

[0081] Furthermore, Fig. 22 a sectional view of another choke coil. In the following embodiment, the same effect is generally achieved as in the one described above. Fig. The choke coil 5 shown in 21 is obtained. The end sections on the inside in the radial direction of the iron cores 41 to 44 of the in Fig. The single-phase choke coil 5 shown in Figure 22 converges towards the center of the outer circumference iron core 20, and the angle of its tip end is approximately 90 degrees.

[0082] A central iron core 80 is arranged in the middle of the single-phase choke coil 5. As shown in the figure, the central iron core 80 has an approximate X-shape with four extension sections 81 to 84. Furthermore, each of the iron cores 41 to 44 is provided, near its end section on the inner surface, with a radially extending, approximately fan-shaped projection 41p to 44p in a clockwise direction. These projections 41p to 44p extend in the region between the end faces of the Fig. 1 adjacent coils. The shape of the end faces of the other iron cores 41 to 44, which are opposite these projections 41p to 44p, is also designed accordingly. The projections 41p to 44p can also run counterclockwise.

[0083] The two respective side surfaces of the extension sections 81 to 84 are adjacent to the end sections on the inside in the radial direction of the iron cores 41 to 44. Magnetically coupling gaps are formed between the two side surfaces of the extension sections 81 to 84 of the central iron core 80 and the iron cores 41 to 44. Consequently, the overall length of the gaps is long, and the inductance can therefore be increased.

[0084] Fig. Figure 23 is a sectional view of yet another single-phase choke coil. The end sections on the inner side in the radial direction of the iron cores 41 to 44 converge towards the center of the outer circumferential iron core 20, and the angle of their tip end is approximately 90 degrees. However, as shown in the drawing, the iron cores 41 and 43 are wider than the other iron cores 42 and 44.

[0085] Furthermore, the in Fig. Figure 23 shows a choke coil 5 with an approximately X-shaped central iron core 80 provided with four expansion sections 81 to 84. The central iron core 80 is shaped such that the end sections are accommodated on the inside in the radial direction of the iron cores 41 to 44 between two adjacent expansion sections 81 to 84. Magnetically coupling gaps are formed between the two side faces of the expansion sections 81 to 84 of the central iron core 80 and the iron cores 41 to 44. It will be understood that the same effect as described above is therefore obtained.

[0086] Furthermore, Fig. 24 a sectional view of another choke coil. The one in Fig. The single-phase choke coil 5 shown in Figure 24 comprises an outer circumferential iron core 20, an approximately hexagonal central iron core 80, and iron core coils 31 to 36 as described above. Each of the iron core coils 31 to 36 comprises an iron core 41 to 46 extending in the radial direction and a coil 51 to 56 wound around this iron core.

[0087] The end section on the inside in the radial direction of each iron core 41 to 46 of the in Fig. The single-phase choke coil 5 shown in Figure 24 is planar. Furthermore, the end sections on the inside of the iron cores 41 to 46 are adjacent to the central iron core 80 in the radial direction via magnetically coupling gaps 101 to 106. In this way, the single-phase choke coil 5 can also comprise an even number of at least six iron core coils 31 to 36.

[0088] Fig. Figure 25 is a sectional view of yet another single-phase choke coil. The iron cores 41 to 44 running in the radial direction of the iron core coils 31 to 34 of the in Fig. The single-phase choke coil 5 shown in Figure 25 each comprises a second iron core section 41b to 44b positioned on the inside in the radial direction and a third iron core section 41c to 44c positioned on the outside in the radial direction.

[0089] Magnetically coupled iron core section gaps 111a to 114a are formed between the central iron core 80 and the second iron core sections 41b to 44b. Furthermore, magnetically coupled iron core section gaps 111b to 114b are formed between the third iron core sections 41c to 44c and the second iron core sections 41b to 44b.

[0090] Since, in this case, with respect to an iron core, for example the iron core 41, a first iron core section gap 111a and a second iron core section gap 111b are formed, the thickness per gap becomes small. Since the thickness of the gap becomes small, the stray magnetic flux from the gap also becomes small. Because the iron cores 41 to 44 are formed from several iron core sections, the single-phase choke coil 5 can be easily assembled. Of course, each iron core 41 to 44 can also be formed from three or more iron core sections arranged in a series.

[0091] Fig. Figure 26 shows a sectional view of yet another single-phase choke coil. Fig. In 26, an additional iron core 41d to 44d is arranged between two adjacent iron cores 41 to 44. The cross-section of the additional iron cores 41d to 44d is part of a fan shape. The cross-section of the additional iron cores 41d to 44d can also be in the shape of an isosceles triangle.

[0092] The end sections on the inner side in the radial direction of the iron cores 41 to 44 comprise two pointed end faces and a flat surface between the two pointed end faces. As in Fig. Figure 26 shows that each of the two flat surfaces of the additional iron cores 41d to 44d runs parallel to the tip end face of the adjacent iron core. Magnetically coupling gaps 101a to 104a and 101b to 104b are formed between the flat surfaces of the additional iron cores 41d to 44d and the tip end faces of the iron cores 41 to 44. Furthermore, magnetically coupling gaps 101 to 104 are formed between the flat surfaces of the iron cores 41 to 44 and the central iron core 80. Additionally, magnetically coupling gaps (not labeled) are formed between the tip ends of the additional iron cores 41d to 44d and the central iron core 80.

[0093] Since in Fig. 26. As the total gap length increases, the inductance can be made larger. Furthermore, since the thickness of the gap per unit can be reduced in this case, the stray magnetic flux is further reduced.

[0094] Furthermore, Fig. 27 shows a sectional view of another single-phase choke coil. In the case of the Fig. In the single-phase choke coil 5 shown in Figure 27, magnetically coupled outer circumferential iron core gaps 111c to 114c are formed between the end sections on the outside in the radial direction of the iron cores 41 to 44 and the outer circumferential iron core 20. During operation of the single-phase choke coil 5, heat is generated at the iron core coils 31 to 34. Since the outer circumferential iron core gaps 111c to 114c are formed in the present embodiment, the heat generated by the iron core coils 31 to 34 has difficulty reaching the outer circumferential iron core 20.

[0095] Fig. Figure 28 is a sectional view of a single-phase choke coil based on a sixteenth embodiment. In the Fig. In the single-phase choke coil 5 shown in Figure 28, the outer circumferential iron core 20 is formed from several, for example four, outer circumferential iron core sections 21 to 24. Fig. 28 The outer circumferential iron core section 21 is in contact with the iron core 41 or is formed integrally with it. Likewise, the outer circumferential iron core sections 22 to 24 are each in contact with the iron cores 42 to 44 or are formed integrally with them. In the case of the Fig. In the embodiment shown in Figure 28, such an outer circumferential iron core 20 can also be easily manufactured even if the outer circumferential iron core 20 is large in format.

[0096] Fig. 29 is a sectional view of another single-phase choke coil. In the Fig. In the single-phase choke 5 shown in Figure 29, the outer circumferential iron core sections 21 to 24 are each arranged over outer circumferential iron core section gaps 61 to 64. In such a case, the outer circumferential iron core section gaps 61 to 64 can be regulated by adjusting the length of the outer circumferential iron core sections 21 to 24. It will be understood that, as a result, the imbalance of the inductance of the single-phase choke 5 can be regulated.

[0097] The in Fig. The single-phase choke coil 5 shown in Figure 29 differs from the one in Figure 29. Fig. The single-phase choke coil 5 shown in Figure 28 differs only in that it has the outer circumferential iron core section gaps 61 to 64. In the case of the Fig. 28 and Fig. In the embodiments shown in Figure 29, such an outer circumferential iron core 20 can also be easily manufactured even if the outer circumferential iron core 20 is large in format.

[0098] Fig. Figure 30 is a sectional view of yet another single-phase choke coil. In the Fig. In the single-phase choke coil 5 shown in Figure 30, the cross-sectional area of ​​coils 51, 54 of iron-core coils 31, 34 is larger than the cross-sectional area of ​​coils 52, 53 of iron-core coils 32, 33. Furthermore, the iron cores 41, 44 of iron-core coils 31, 34 are narrower than the iron cores 42, 43 of iron-core coils 32, 33. The dimensions of columns 101 to 104 are identical.

[0099] In other words, the single-phase choke coil comprises 5 as in Fig. Figure 30 shows a first group consisting of two iron-core coils 31, 34 and a second group consisting of the other two iron-core coils 32, 33. The first group and the second group each contain two adjacent iron-core coils from the four iron-core coils 31 to 34. In the Fig. In the single-phase choke coil 5 shown in Figure 30, the dimensions of the iron cores, as well as the cross-sectional area and the number of turns of the coils, are designed to differ between the first and second groups. The dimensions of the gap in the first group of the single-phase choke coil 5 can also be designed to differ from the dimensions of the gap in the second group.

[0100] Consequently, two choke coils with different characteristics are effectively incorporated into a single-phase choke coil 5. This reduces the space required for the two choke coils with differing characteristics. It will be understood that the inductance value can be adjusted by connecting the two choke coils in series or in parallel.

[0101] Furthermore, Fig. 31 shows a sectional view of another single-phase choke coil. In the Fig. In the single-phase choke coil 5 shown in Figure 31, the iron cores 41, 42 are wider than the other iron cores 45, 46, and the iron cores 45, 46 are wider than the other iron cores 43, 44. Furthermore, the cross-sectional area of ​​the coils 51, 52 wound around the iron cores 41, 42 is smaller than the cross-sectional area of ​​the coils 55, 56 wound around the iron cores 45, 46, and the cross-sectional area of ​​the coils 55, 56 is smaller than the cross-sectional area of ​​the coils 53, 54 wound around the other iron cores 43, 44.

[0102] Consequently, the single-phase choke coil comprises 5 as in Fig. Figure 31 shows a first group formed from the two iron core coils 31, 32, a second group formed from two other iron core coils 33, 34, and a third group formed from yet other iron core coils 35, 36. The first to third groups each comprise two adjacent iron core coils of the six iron core coils 31 to 36.

[0103] At the in Fig. In the single-phase choke coil 5 shown in Figure 31, the dimensions of the iron cores, the cross-sectional area, and the number of turns of the coils are designed to differ between the first and third groups. The dimensions of the gap in the first group of the single-phase choke coil 5 can also be designed to differ from the dimensions of the gaps in the other groups. It will be understood that, due to such a design, the same effect as in the Fig. The embodiment shown in section 30 is obtained. It is also possible to incorporate four or more choke coils, that is, four or more of the aforementioned groups, whose properties differ or are the same, into a single single-phase choke coil 5. It will be clear that the same effect is obtained in this case as well.

[0104] Incidentally, Fig. 32 and Fig. 33 sectional views of other single-phase choke coils. These drawings show an approximately square single-phase choke coil 5.

[0105] As shown in the drawings, the opposing iron cores 42, 44 have the same shape as described above.

[0106] In contrast, at the tips of the opposing iron cores 41, 43, a broadened section 41e, 43e is formed, which is wider than the main section of the iron core 41, 43. The shape of these broadened sections 41e, 43e corresponds to part of a rhombus shape. However, the broadened sections 41e, 43e can also have a different shape.

[0107] Magnetically coupling gaps 101 to 104 are formed between the widened sections 41e, 43e of the iron cores 41, 43 and the iron cores 42, 44. Furthermore, magnetically coupling gaps 121a to 124a are also formed between the widened sections 41e, 43e of the iron cores 41, 43 and the central iron core 80, and between the iron cores 42, 44 and the central iron core 80. The total length of gaps 101 to 104 and 121a to 124a, which are in Fig. Figure 32 shows that the total length of the column of another choke coil of the same shape, which does not have widened sections, is longer than the total length of the column of another choke coil with the same shape.

[0108] At the in Fig. In the single-phase choke coil 5 shown in Figure 33, the opposing iron cores 41, 43 are wider across their entirety than the other opposing iron cores 42, 44. Furthermore, in the planar surfaces of the opposing iron cores 41, 43 of the choke coil 5, Fig. 33 depressions are formed, and the central iron core 80 is arranged in these depressions. Therefore, a rectangular additional gap 105 is formed between the central iron core 80 and the iron cores 41, 43.

[0109] Therefore, the total length of columns 101 to 104 and the additional column 105 is in Fig. The choke coil 5 shown in Figure 33 is longer than the total length of the column of a choke coil 5 where the width of the iron cores 41, 43 is equal to the width of the iron cores 42, 44. If the total length of the column is as shown in Figure 33, the overall length of the column is greater than the total length of the column of a choke coil 5 where the width of the iron cores 41, 43 is equal to the width of the iron cores 42, 44. Fig. 32 and Fig. As shown in diagram 33, it is possible to increase the inductance.

[0110] In the case of the choke coil 5 equipped with the medium iron core 80, it is also possible to do this with reference to Fig. 11 and Fig. 12 declared fission material 71, 72 to be set up.

[0111] Furthermore, Fig. 34 a sectional view of another choke coil. Fig. 34 is a Fig. 21 corresponding view. But in Fig. 34 are the ones in Fig. The coils shown in 21, 52 and 54, are eliminated. Consequently, in Fig. 34 iron cores 41, 43 with coils 51, 53 and iron cores 42, 44 without coils arranged alternately.

[0112] It is also possible with the other choke coils discussed above (5) to remove some of the iron cores from the coils. However, in this case, it is not absolutely necessary for the coils with iron cores and the coils without iron cores to be arranged alternately.

[0113] Fig. Figure 35 is a schematic view showing a state-of-the-art single-phase choke coil. In the Fig. In the single-phase choke coil 100 shown in Figure 35, coils 171, 172 are arranged between two approximately C-shaped iron cores 150, 160. Therefore, the coils 171, 172 are arranged parallel to each other.

[0114] If in Fig. 35. Since magnetic fluxes flow in the two adjacent coils as shown by the broad arrows, the magnetic fluxes on the outside of the coils cancel each other out as shown by the narrow arrows. Because this increases the magnetic resistance, there is a tendency for the value of the inductance of the coils to increase. Fig. The single-phase choke coil shown in Figure 35 is 100 times larger than the theoretical value.

[0115] Fig. 36 is a schematic view of a like in Fig. Figure 1A shows a single-phase choke coil. In this case, two adjacent coils, for example coils 52 and 53, are not parallel to each other, but form an angle of approximately 90°. Therefore, the magnetic fluxes on the outside of the coils, as indicated by the narrow arrows, do not cancel each other out when magnetic fluxes flow in the two adjacent coils, as indicated by the broad arrows. Consequently, the magnetic resistance of the single-phase choke coil 5 does not increase. Therefore, the value of the inductance of the single-phase choke coil 5 is roughly equal to the theoretical value. It will be clear that the value of this inductance approaches the theoretical value more closely the larger the angle formed by the two adjacent coils.

[0116] When an iron core is placed between two adjacent coils, the inductance value approaches the theoretical value even more closely. Therefore, it is advantageous to use an iron core in the coil. Fig. 36 to arrange an additional iron core in the area shown.

[0117] Now is Fig. Figure 37 shows a sectional view of a single-phase choke coil according to an embodiment of the invention. Fig. 37 is at the point that corresponds to area A in Fig. 36 corresponds to an additional iron core 45 with the cross-section of an isosceles triangle. As shown in the drawing, the sides containing the vertex angle of the cross-section of the additional iron core 45 are roughly equal to the thickness of the coils 51, 54. In other words, the arrangement of the iron core coils in Fig. 36. By arranging an iron core close to the outside of adjacent iron-core coils, the magnetic fluxes flowing on the outside of adjacent iron-core coils no longer interfere with each other, and the increase and decrease of the magnetic fluxes occurs as if the two adjacent iron-core coils were one iron-core coil. Since the fluctuation of the inductance of each phase in one period of the current waveform is thereby compared with the arrangement of the iron-core coils in Fig. By gently applying pressure to 35°C, the hysteresis loss of the iron core material can be reduced.

[0118] In Fig. 37. The coils 51, 54 are in contact with the inner surface of the outer circumferential iron core 20. Therefore, the coils 51, 54 are surrounded by the iron cores 41, 44, the outer circumferential iron core 20, and the additional iron core 45. In other words, three sides of the cross-section of the coils 54, 54 are in contact with the iron cores 41, 44, the outer circumferential iron core 20, and the additional iron core 45. It will be understood that in such a case, the effect described above is high. In the Fig. In the single-phase choke coil 5 shown in Figure 37, additional iron cores 45 can also be arranged in at least two areas between the coils 51 to 54. The additional iron cores 45 can also be integrally formed with the outer circumferential iron core 20.

[0119] Fig. Figure 13 is a view of a machine or device containing a single-phase choke coil of the present invention. Fig. 13. The single-phase choke coil 5 is used in a motor drive device. The machine or device contains such a motor drive device.

[0120] As from Fig. As can be seen from Figure 13, the single-phase choke coil 5 can also be included in a rectifying device for converting direct current into alternating current in photovoltaic power generation or the like. Such a rectifying device can also be provided in a charging device, for example, a vehicle charging device. It will be understood that a motor drive device, a rectifying device, a machine, a charging device, or the like, which contains a single-phase choke coil 5, can easily be provided in such a case. Content of the Revelation

[0121] According to a first unclaimed embodiment, a single-phase choke coil is provided, which is provided with an outer circumferential iron core and at least four iron core coils which are in contact with or connected to the inner surface of the outer circumferential iron core, wherein each of the at least four iron core coils comprises an iron core and a coil wound around this iron core, and wherein magnetically coupling gaps are formed between two adjacent iron core coils of the at least four iron core coils.

[0122] According to a second form, the number of at least four iron core coils in the first form is an even number of six or more.

[0123] According to a third form, the iron cores of the at least four iron core coils in the first or second form are formed from several iron core sections.

[0124] According to a fourth form, in the third form magnetically coupling iron core section gaps are formed between the several iron core sections.

[0125] According to a fifth form, magnetically coupling outer circumferential iron core gaps are formed between the iron cores of the at least four iron core coils and the outer circumferential iron core in a form derived from the first to fourth forms.

[0126] According to a sixth form, the outer circumferential iron core is formed from several outer circumferential iron core sections in a form derived from the first to fifth forms.

[0127] According to a seventh form, in the sixth form, outer circumference iron core section gaps are formed between adjacent outer circumference iron core sections of the several outer circumference iron core sections.

[0128] According to an eighth form, the single-phase choke coil, in a form derived from the first to seventh, comprises a first group consisting of at least two iron core coils, and a second group consisting of at least two other iron core coils.

[0129] According to a ninth form, the single-phase choke coil in the eighth form has three or more groups consisting of at least two iron core coils.

[0130] According to a tenth form, in a form derived from the first to ninth, a gap material, which is a non-magnetic material, or insulating paper or resin, is inserted or filled into at least one of the gaps, the iron core section gaps and the outer circumferential iron core gaps of the single-phase choke coil.

[0131] According to an eleventh form, in a form derived from the first to ninth, a gap material, which is a non-magnetic material, or an insulating material or a resin, is filled into the inside of the outer circumferential iron core of the single-phase choke coil.

[0132] According to a twelfth form, a motor drive device is provided which is equipped with the single-phase choke coil according to one of the first to eleventh forms.

[0133] According to a thirteenth form, a machine is provided which is equipped with the single-phase choke coil according to one of the first to eleventh forms.

[0134] According to a fourteenth form, a rectification device is provided which is equipped with the single-phase choke coil according to one of the first to eleventh forms.

[0135] A charging device is provided according to a fifteenth form, which is equipped with the rectifying device according to the fourteenth form. Results of the forms

[0136] In the first design, the magnetically coupled gaps are positioned near the center of the single-phase choke coil. Furthermore, the angle formed by two adjacent iron cores across a gap is less than 180 degrees. Therefore, the stray magnetic flux from one iron core can easily transfer to the nearest adjacent iron core, and the stray magnetic flux penetrating the coils can be reduced further than in the prior art. Since the coils can also be positioned further away from the gap, the proportion of stray magnetic flux from the gap penetrating the windings can be reduced. As a result, the eddy current loss inside the coils is reduced.

[0137] Since the number of iron-core coils in the second configuration is an even number of six or more, there are multiple iron-core coils per phase. Connecting these multiple coils in parallel reduces the cross-sectional area of ​​each individual coil. Connecting the multiple iron-core coils in series or parallel allows for inductance regulation.

[0138] Since the iron cores in the third type are formed from several iron core sections, the assembly of the single-phase choke coil can be carried out easily.

[0139] Since the fourth configuration involves gaps both between the iron-core coils and gaps between the multiple iron-core sections, the dimension of the gaps per position can be reduced. Because this reduces the stray magnetic flux from the gaps, the eddy current loss inside the coils due to the stray magnetic flux can be reduced.

[0140] Since in the fifth form outer circumference iron core gaps are formed between the outer circumference iron core and the iron core coils, the heat generated by the iron core coils only reaches the outer circumference iron core with difficulty.

[0141] Since the outer circumference iron core in the sixth form is subdivided multiple times, the outer circumference iron core can be easily manufactured even if the outer circumference iron core is large in format.

[0142] In the seventh form, the imbalance of inductance can be easily regulated by adjusting the outer circumference iron core gap.

[0143] Since the eighth configuration incorporates two single-phase chokes into a single single-phase choke, the required installation space can be reduced when two single-phase chokes are needed. Furthermore, the inductance can be adjusted by connecting these single-phase chokes in series or parallel.

[0144] Since the ninth design incorporates three or more single-phase chokes into a single single-phase choke, the required installation space can be reduced when three or more single-phase chokes are needed. Furthermore, the inductance can be adjusted by connecting the three or more single-phase chokes in series or parallel.

[0145] In the tenth form, vibrations of the iron cores in contact with the gaps can be suppressed and the noise generated by the iron cores can be reduced.

[0146] In the eleventh form, the thermal equilibrium between the iron core coils and the outer circumferential iron core can be promoted, and the noise generated by the iron cores and the outer circumferential iron core can be reduced.

[0147] In the twelfth and thirteenth forms, a motor drive device containing a single-phase choke coil, or a machine containing a single-phase choke coil, can easily be provided.

[0148] In the fourteenth form and the fifteenth form, a rectifying device characterized in that the single-phase choke coil is designed as at least one of an AC choke coil on the AC side of the rectifying device, as a smoothing choke coil on the DC side, or as a choke coil forming an LC filter, as well as a charging device containing this rectifying device, can easily be provided.

Claims

[1] Single-phase choke coil comprising an outer circumferential iron core (20); at least four iron cores (41 to 44) which are in contact with or connected to the inner surface of the outer circumferential iron core (20), wherein the four iron cores (41 to 44) extend radially and are arranged at equal intervals in the circumferential direction such that the angle formed by the center lines of any two adjacent iron cores (41 to 44) is 90 degrees, wherein the iron cores (41 to 44) have inner ends which converge radially towards the center of the outer circumferential iron core (20), the angle of their tip end being 90 degrees; coils (51 to 54) which are wound around each of the four iron cores (41 to 44), wherein magnetically coupling gaps (101 to 104) are formed between two adjacent iron cores of the at least four iron cores (41 to 44), separating the inner ends of the iron cores (41 to 44) from each other; and at least one additional iron core (45) having the cross-section of an isosceles triangle, arranged between two adjacent coils (51, 54), wherein the coils (51, 54) are in contact with the inner surface of the outer circumferential iron core (20) and are surrounded by the two associated iron cores (41, 44), the outer circumferential iron core (20) and the additional iron core (45). [2] Single-phase choke coil according to claim 1, wherein a gap material (71) which is a non-magnetic material, or insulating paper or resin is inserted or filled in at least one of the gaps (101 to 104) in the single-phase choke coil. [3] Single-phase choke coil according to claim 1 or 2, wherein magnetically coupling outer circumferential iron core gaps (111c to 114c) are formed between the iron cores (41 to 44) and the outer circumferential iron core (20). [4] Single-phase choke coil according to claim 3, wherein a gap material (71) which is a non-magnetic material, or an insulating material or a resin is inserted or filled into at least one of the outer circumferential iron core gaps (111c to 114c) in the single-phase choke coil. [5] Single-phase choke coil according to one of claims 1 to 4, wherein the iron core (41 to 44) is formed from several iron core sections (41a to 44a, 41b to 44b, 41c to 44c). [6] Single-phase choke coil according to claim 5, wherein magnetically coupling iron core section gaps (111a to 114a, 111b to 114b) are formed between the several iron core sections (41a to 44a, 41b to 44b, 41c to 44c). [7] Single-phase choke coil according to claim 6, wherein a gap material (71) which is a non-magnetic material, or insulating paper or resin is inserted or filled into at least one of the iron core section gaps (41a to 44a, 41b to 44b, 41c to 44c) in the single-phase choke coil. [8] Single-phase choke coil according to one of claims 1 to 7, wherein the outer circumferential iron core (20) is formed from several outer circumferential iron core sections (21 to 24). [9] Single-phase choke coil according to claim 8, wherein outer-circumferential iron core section gaps (61 to 64) are formed between adjacent outer-circumferential iron core sections of the several outer-circumferential iron core sections (21 to 24). [10] Single-phase choke coil according to one of claims 9, wherein a gap material (71) which is a non-magnetic material, or insulating paper or resin is inserted or filled in at least one of the outer circumferential iron core section gaps (61 to 64) of the single-phase choke coil. [11] Single-phase choke coil according to any one of claims 1 to 10, wherein the single-phase choke coil comprises a first group consisting of at least two iron cores (41 to 44) around which the coils (51 to 54) are wound, and a second group consisting of the other at least two iron cores (41 to 44) around which the coils (51 to 54) are wound. [12] Single-phase choke coil according to claim 9, wherein a gap material (72) which is a non-magnetic material, or an insulating material or a resin is filled into the inside of the outer circumferential iron core (20) in the single-phase choke coil. [13] Motor drive device which is provided with a single-phase choke coil according to any one of claims 1 to 12. [14] Machine equipped with a single-phase choke coil according to any one of claims 1 to 12. [15] Rectifying device comprising a single-phase choke coil according to any one of claims 1 to 12. [16] Charging device which is equipped with a rectifying device according to claim 15.

Images