WO2022249411A1

WO2022249411A1 - Electromagnetic device with coil case and coil case

Info

Publication number: WO2022249411A1
Application number: PCT/JP2021/020282
Authority: WO
Inventors: 友和吉田
Original assignee: ファナック株式会社
Priority date: 2021-05-27
Filing date: 2021-05-27
Publication date: 2022-12-01

Abstract

The present invention eliminates the need to change a coil case even when the height of an electromagnetic device changes. An electromagnetic device (6) includes a core body (5) including a plurality of iron cores (41 to 44), coils (51 to 54) to be attached to the iron cores, respectively, and coil cases (61 to 64) that at least partially cover the iron cores, respectively, to insulate the iron cores from the coils. Each of the coil cases is divided, in the axial direction of the core body, into two portions being a first coil case part (61a) and a second coil case part (61b).

Description

Electromagnetic equipment with coil case and coil case

The present invention relates to electromagnetic equipment with a coil case, such as reactors, transformers, linear motors and motors, and coil cases.

In recent years, electromagnetic devices have been developed that include a core body that includes an outer core and a plurality of cores arranged inside the outer core. A coil is wound around each of the plurality of iron cores. Also, there is known a technique of assembling a coil housed in a coil case into an electromagnetic device for the purpose of insulating the core body and the coil. See, for example, US Pat.

JP 2019-004126 A Japanese Patent Application Laid-Open No. 2019-016711

The core body is usually formed by stacking multiple magnetic plates. Therefore, when an electromagnetic device with different characteristics is required, the number of magnetic plates to be laminated is changed to change the characteristics of the electromagnetic device.

However, if the characteristics of the electromagnetic device are changed by changing the number of magnetic plates, the height of the electromagnetic device will change. need to prepare. Since the coil case is usually made of resin, it is necessary to create a new mold in order to prepare another coil case. In particular, when a plurality of electromagnetic devices with different characteristics are required, it is necessary to prepare separate coil cases for each electromagnetic device, which is extremely complicated.

Therefore, there is a demand for an electromagnetic device and the coil case itself that do not require changing the coil case even if the height of the electromagnetic device changes.

According to a first aspect of the present disclosure, a core body provided with a plurality of iron cores, a coil to be attached to each of the plurality of iron cores, and at least partially covering each of the plurality of iron cores, the a coil case insulated from a coil, wherein the coil case includes a first coil case portion and a second coil case portion that are divided into two in the axial direction of the core body.

In the first aspect, since the coil case is divided into two in the height direction of the core body, the divided coil cases are arranged on the upper end side and the lower end side of the coil, respectively. As a result, the coil can be supported by its upper and lower ends, so there is no need to prepare a separate coil case. Therefore, even if the height of the electromagnetic device changes, it is possible to eliminate the need to change the coil case.

The objects, features and advantages of the present invention will become clearer from the following description of the embodiments in conjunction with the accompanying drawings.

4 is a cross-sectional view of a core body included in the electromagnetic device based on the first embodiment; FIG. 1B is a perspective view of the electromagnetic device shown in FIG. 1A; FIG. It is an exploded perspective view of a coil case. 2B is a front view of the coil case shown in FIG. 2A; FIG. FIG. 4 is a perspective view of an outer core portion showing a state in which a coil is housed in a coil case; It is a perspective view of an outer peripheral core portion. FIG. 11 is a perspective view of another outer peripheral core portion; It is a front view of a coil case. It is another front view of a coil case. 3 is a perspective view of a coil case and an iron core; FIG. FIG. 10 is another perspective view of the coil case and core; FIG. 11 is a partial perspective view of a fitting portion in another aspect; FIG. 11 is a partial perspective view of a fitting portion in still another aspect; FIG. 9 is an exploded perspective view of a coil case in another embodiment; 6B is a partial perspective view of an electromagnetic device including the coil case shown in FIG. 6A; FIG. 6B is a partial perspective view of another electromagnetic device including the coil case shown in FIG. 6A; FIG. FIG. 10 is a cross-sectional view of a core body included in the electromagnetic device according to the second embodiment; FIG. 4 is a cross-sectional view of a core body included in an electromagnetic device according to another embodiment; FIG. 11 is a cross-sectional view of a core body included in an electromagnetic device according to yet another embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Corresponding elements are provided with common reference numerals throughout the drawings.
In the following description, a three-phase reactor is mainly described as an example of an electromagnetic device, but the application of the present disclosure is not limited to three-phase reactors, and is widely applicable to multi-phase reactors that require a constant inductance in each phase. applicable and also applicable to transformers. In addition, the reactor according to the present disclosure is not limited to being provided on the primary side and secondary side of inverters in industrial robots and machine tools, and can be applied to various devices.

FIG. 1A is a cross-sectional view of a core body included in the electromagnetic device based on the first embodiment. FIG. 1B is a perspective view of the electromagnetic device shown in FIG. 1A. As shown in FIGS. 1A and 1B, core body 5 of electromagnetic device 6 includes outer core 20 and three core coils 31 to 33 arranged inside outer core 20 . In FIG. 1, core coils 31 to 33 are arranged inside a substantially hexagonal outer peripheral core 20 . These iron core coils 31 to 33 are arranged at regular intervals in the circumferential direction of the core body 5 .

Note that the outer peripheral iron core 20 may have another rotationally symmetrical shape, such as a circular shape. Moreover, the number of core coils may be a multiple of 3, and in that case, the reactor as the electromagnetic device 6 can be used as a three-phase reactor.

As can be seen from the drawing, each of the core coils 31-33 includes cores 41-43 extending only in the radial direction of the outer core 20 and coils 51-53 attached to the cores. At least three coils 51-53 are housed in coil cases 61-63, respectively. The coil cases 61-63 are preferably made of a non-magnetic material such as resin. The coil cases 61-63 serve to at least partially cover the respective cores 41-43 to insulate them from the coils 51-53.

The outer peripheral core 20 is composed of a plurality of, for example, three outer peripheral core portions 24 to 26 divided in the circumferential direction. The outer core portions 24-26 are formed integrally with the cores 41-43, respectively. As can be seen from FIG. 3, which will be described later, the outer core portions 24-26 and the cores 41-43 are formed by laminating a plurality of magnetic plates, such as iron plates, carbon steel plates, and electromagnetic steel plates, or formed from dust cores. When the outer peripheral core 20 is composed of a plurality of outer peripheral core portions 24 to 26 in this way, even if the outer peripheral core 20 is large, such an outer peripheral core 20 can be easily manufactured. can. It should be noted that the number of cores 41-43 does not necessarily have to match the number of outer core portions 24-26.

Furthermore, the radially inner ends of the iron cores 41 to 43 are located near the center of the outer peripheral iron core 20 . In the drawing, the radially inner ends of the cores 41 to 43 converge toward the center of the outer core 20 and have a tip angle of about 120 degrees. The radially inner ends of cores 41-43 are then separated from each other by magnetically coupleable gaps 101-103.

In other words, the radially inner end of the core 41 is separated from the radially inner ends of the two

adjacent cores

42, 43 via the

gaps

101, 103, respectively. The same applies to

other iron cores

42 and 43. It is assumed that the dimensions of the gaps 101 to 103 are equal to each other.

As described above, the configuration shown in FIG. 1A does not require a center iron core positioned at the center of the core body 5, so the core body 5 can be made lightweight and simple. Furthermore, since the three core coils 31-33 are surrounded by the outer core 20, the magnetic fields generated by the coils 51-53 do not leak outside the outer core 20. FIG. In addition, since the gaps 101 to 103 can be provided with an arbitrary thickness at low cost, it is advantageous in terms of design compared to reactors of conventional structure.

Furthermore, in the core body 5 of the present disclosure, the difference in the magnetic path length between the phases is reduced as compared with the electromagnetic device with the conventional structure. Therefore, in the present disclosure, it is also possible to reduce the inductance imbalance caused by the difference in magnetic path length.

As can be seen with reference to FIG. 1B, each of the coils 51 to 53 attached to the iron cores 41 to 43 is formed by winding a single conductive wire having a rectangular cross section, that is, a rectangular wire at least once. It is a rectangular wire coil formed. Note that the coils 51 to 53 (54) may be coils other than rectangular wire coils.

FIG. 2A is an exploded perspective view of the coil case viewed from the inside in the radial direction of the electromagnetic device, and FIG. 2B is a front view of the coil case shown in FIG. 2A. In these drawings and other drawings to be described later, only the coil case 61 is shown as a representative, but the

other coil cases

62, 63, (64) are assumed to have the same configuration. The coil case 61 is divided into two parts in the axial direction of the electromagnetic device 5 . The coil case 61 is composed of a first coil case portion 61a located on the upper side and a second coil case portion 61b located on the lower side.

The first coil case portion 61a supports the upper end side of the coil 51. The first coil case portion 61a includes a housing 81a having an open surface and a lower surface positioned radially outwardly of the electromagnetic device 6, and a hollow projecting portion 82a projecting radially inwardly of the electromagnetic device 6 from the aforementioned surface of the housing 81a. and

Similarly, the second coil case portion 61b supports the lower end side of the coil 51. The second coil case portion 61b also includes an outer housing 81b having an open surface and an upper surface positioned radially outwardly of the electromagnetic device 6, and a hollow projection projecting radially inwardly of the electromagnetic device 6 from the aforementioned surface of the housing 81b. and a portion 82b.

FIG. 2C is a perspective view of the outer core portion showing the state in which the coil is housed in the coil case. As can be seen from FIG. 2C, the coil 51 includes a first coil receiving portion 83a formed between the housing 81a and the hollow protrusion 82a and a second coil formed between the housing 81b and the hollow protrusion 82b. It is housed in the housing portion 83b. In other words, the

hollow protrusions

82 a and 82 b are inserted into the openings of the coil 51 .

As shown in FIG. 2A and the like, the lower portion of the first coil case portion 61a and the upper portion of the second coil case portion 61b are configured as a fitting portion 70 that can be fitted to each other. As shown in FIG. 2B, the fitting portion 70 of the first coil case portion 61a is formed as a thin portion 71a having a thickness T3 that is less than the thickness T1 of the housing 81a and the thickness T2 of the hollow protrusion 82a. there is

Similarly, the fitting portion 70 of the second coil case portion 61b is formed as a thin portion 71b having a thickness T3' smaller than the thickness T1 of the housing 81b and the thickness T2 of the hollow projecting portion 82b. Although not necessarily limited, the thicknesses T1 and T2 are preferably equal to each other. Furthermore, the thicknesses T3, T3' are preferably equal to each other and half the thicknesses T1, T2.

Further, as illustrated, the outer surface of the thin portion 71a on the housing 81a side is flush with the outer surface of the housing 81a. Further, the outer surface of the thin portion 71a on the side of the hollow protruding portion 82a is flush with the inner surface of the hollow protruding portion 82a. Similarly, the inner surface of the thin portion 71b on the housing 81b side is flush with the inner surface of the housing 81b. Further, the inner surface of the thin portion 71b on the side of the hollow protruding portion 82b is flush with the outer surface of the hollow protruding portion 82a.

The distance La between the inner surface of the thin portion 71a of the housing 81a and the inner surface of the thin portion 71a of the hollow protrusion 82a is the distance between the outer surface of the thin portion 71b of the housing 81b and the outer surface of the thin portion 71b of the hollow protrusion 82b. It is the same as or slightly larger than the distance Lb.

Therefore, the fitting portion 70 of the second coil case portion 61b can be slidably inserted into the fitting portion 70 of the first coil case portion 61a. Moreover, the length of the fitting portion 70 of the first coil case portion 61a and the length of the fitting portion 70 of the second coil case portion 61b in the axial direction of the electromagnetic device 6 are preferably equal to each other.

By the way, FIGS. 3A and 3B are perspective views of the outer core portion. The outer core portions 24, 24' shown in these drawings are formed by laminating a plurality of magnetic plates. The number of magnetic plates laminated to form the outer core portion 24 shown in FIG. 4A is greater than the number of magnetic plates laminated to form the outer core portion 24' shown in FIG. 3B. . As a result, the outer core portion 24 shown in FIG. 3A is taller than the outer core portion 24 shown in FIG. 3B.

4A and 4B are front views of the coil case. Furthermore, FIGS. 4C and 4D are perspective views of the coil case and core. 4C is a drawing corresponding to FIGS. 3A and 4A, and FIG. 4D is a drawing corresponding to FIGS. 3B and 4B. In these and other drawings, coil 51 and/or core 41 may be omitted for ease of understanding.

In FIG. 4A, the fitting portion 70 of the second coil case portion 61b is slightly inserted into the fitting portion 70 of the first coil case portion 61a. In other words, the thin portion 71a and the thin portion 71b are slightly engaged with each other. Therefore, the overall height of the

hollow protrusions

82a and 82b in the axial direction of the electromagnetic device 6 is relatively large. The total height of the

hollow protrusions

82a, 82b is determined according to the height of the outer peripheral core portion 24 to be applied, that is, the number of laminated magnetic plates. The height of the coil case 61 shown in FIG. 4A is adjusted to accommodate the relatively tall outer core portion 24' shown in FIG. 3A. In FIG. 4C, since the illustration of the coil 51 is omitted, most of the thin portion 71a of the hollow protruding portion 82a can be seen.

In FIG. 4B, most of the fitting portion 70 of the second coil case portion 61b is inserted into the fitting portion 70 of the first coil case portion 61a. In other words, the thin portion 71a and the thin portion 71b are mostly engaged with each other. Therefore, the overall height of the

hollow protrusions

82a and 82b in the axial direction of the electromagnetic device 6 is relatively small. The height of the coil case 61 shown in FIG. 4B is adjusted to accommodate the relatively low outer core portion 24 shown in FIG. 3B. In FIG. 4D only a portion of the thin portion 71a of the hollow projection 82a is visible.

Thus, in the present disclosure, the coil case 61 is divided into two parts, the first coil case portion 61a and the second coil case portion 61b. The first coil case portion 61 a supports the upper end side of the coil 51 and the second coil case portion 61 b supports the lower end side of the coil 51 . Therefore, even if the height of the outer core portion 24 changes, there is no need to prepare another coil case with a different height.

Furthermore, since the fitting portion 70 of the first coil case portion 61a and the fitting portion 70 of the second coil case portion 61b are slidably fitted, the entire coil case 61 can be Height can be adjusted. For example, when the fitting portion 70 of the second coil case portion 61b is inserted into the fitting portion 70 of the first coil case portion 61a, the height of the entire coil case 61 can be easily adjusted with a simple configuration.

Furthermore, in the first embodiment, as shown in FIG. 4A, the thin portions 71a of the

coil case portions

61a and 61b are at least partially fitted to each other. In other words, the

coil case portions

61a, 61b are never completely separated, and no gap occurs between the

coil case portions

61a, 61b.

Therefore, between the coil 51 to be accommodated in the coil case 61 and the core 41, there are hollow projecting

portions

82a, 82b, or the thin portion 71a of the first coil case portion 61a and/or the second coil. There will be a thin portion 71b of the case portion 61b. That is, the inner and outer peripheral surfaces of the coil 51 are entirely covered with the coil case 61 . Therefore, when the electromagnetic device 6 is driven, a sufficient insulation distance can be secured between the iron core 41 and the coil 51 .

A snap engaging portion 91, which is preferably made of resin, is provided on a portion of the hollow protruding portion 82a. The snap engaging portion 91 includes a plate spring portion 91a extending radially inward in a cantilever manner from the end surface of the housing 81b positioned radially outwardly of the electromagnetic device 6, and a holding portion 91b provided at the tip of the plate spring portion 91a. including. When the coil 51 is accommodated in the

coil accommodating portions

83a and 83b, the leaf spring portion 91a is pushed downward to return to its original position, and the holding portion 91b engages the end face of the coil 51. As shown in FIG. That is, the coil 51 is snap-engaged with the coil case 61 by the snap-engaging portion 91 . Therefore, the coil 51 can be prevented from falling out of the coil case 61 .

FIG. 5A is a partial perspective view of a fitting portion in another aspect. 5A shows the inner surfaces of the

housings

81a and 81b shown on the right side in FIG. 4A and the like. The left side of

housings

81a, 81b, etc. in FIG. 4A etc. shall have the same structure. A recess 71c is formed in the housing 81a of the first coil case portion 61a adjacent to the thin portion 71a of the first coil case portion 61a. The recess 71c and the thin portion 71a are on the same plane. The concave portion 71c extends in the sliding direction of the

coil case portions

61a and 61b.

Similarly, the housing 81b of the second coil case portion 61b is provided with a convex portion 71d that fits into the concave portion 71c adjacent to the thin portion 71b of the second coil case portion 61b. The convex portion 71d and the thin portion 71b are on the same plane. In the sliding direction of the

coil case portions

61a and 61b, the convex portion 71d extends so as to protrude from the tip of the thin portion 71b.

This makes it possible to increase the coupling force between the first coil case portion 61a and the second coil case portion 61b. The convex portion 71d may be formed in the first coil case portion 61a, and the concave portion 71c may be formed in the second coil case portion 61b. Furthermore, a case in which a plurality of recesses 71c and a plurality of projections 71d engaged therewith are formed is also included within the scope of the present disclosure.

FIG. 5B is a partial perspective view of a fitting portion in still another aspect. 5B shows the inner surfaces of the

housings

81a and 81b shown on the right side in FIG. 4A and the like. The left side of

housings

81a, 81b, etc. in FIG. 4A etc. shall have the same structure. In FIG. 5B, the first coil case portion 61a and the second coil case portion 61b do not have thinned

portions

71a, 71b. Instead,

housings

81a, 81b and

hollow projections

82a, 82b extend to positions corresponding to thinned

portions

71a, 71b, respectively. The

housings

81a, 81b and the

hollow projections

82a, 82b are assumed to have the same thickness.

5B, a plurality of through holes 70c are sequentially formed in the housing 81a along the axial direction of the electromagnetic device 6. In FIG. A projecting portion 70a projects upward from the upper end of the housing 81b. The thickness of the projecting portion 70a is the same as the thickness of the housing 81b. Further, an engaging portion 70b that engages with the through hole 70c is provided at the tip of the projecting portion 70a. The projecting portion 70a and the engaging portion 70b are preferably formed integrally with the housing 81b. The fitting portion 70 in the aspect shown in FIG. 5B includes a projecting portion 70a, an engaging portion 70b, and a plurality of through holes 70c.

In FIG. 5B, the engaging portion 70b of the protruding portion 70a is engaged with the lowermost through hole 70c. In this case, the length of the coil case 61 can be set to the longest. It will be understood that the length of the coil case 61 can be adjusted by changing the engaging position of the engaging portion 70b to another through hole 70c. In this case, since it is not necessary to form the

thin portions

71a and 71b, the length of the coil case 61 can be adjusted with a simple configuration.

FIG. 6A is an exploded perspective view of a coil case in another embodiment, similar to FIG. 2A. The upper side of the first coil case portion 61a in FIG. 2A is open. In contrast, the housing 81a of the first coil case portion 61a shown in FIG. 6A has an integral top surface 85 so that the top side of the first coil case portion 61a is closed. Therefore, the coil case 61 shown in FIG. 6A can cover the coil 51 over its entire circumference.

By the way, FIG. 6B is a partial perspective view of an electromagnetic device provided with the coil case shown in FIG. 6A. A linear motor is shown as the electromagnetic device 6 in FIG. 6B. The core body 5 of the electromagnetic device 6 is formed by stacking a plurality of magnetic plates, such as iron plates, carbon steel plates, and electromagnetic steel plates, or formed from a dust core. Note that the lamination direction of the plurality of magnetic plates is perpendicular to the juxtaposition direction of the plurality of iron cores 41 and the like. The core body 5 includes a plurality of

iron cores

41, 42, 43, . The heights of the

iron cores

41, 42, 43, .

Furthermore, FIG. 6C is a partial perspective view of another electromagnetic device provided with the coil case shown in FIG. 6A. FIG. 6C shows a motor stator as the electromagnetic device 6 . As described above, the core body 5 is formed by stacking a plurality of magnetic plates, such as iron plates, carbon steel plates, and electromagnetic steel plates, or from a dust core. Note that the lamination direction of the plurality of magnetic plates is the same as the radial direction of the stator. The core body 5 includes a plurality of

iron cores

41, 42, 43, . The heights of the

iron cores

41, 42, 43, .

As indicated by arrows in FIGS. 6B and 6C,

iron cores

41, 42, 43, . . . are inserted into

coil cases

61, 62, 63, . It has become so. Therefore, also in this case, the same effect as described above can be obtained.

The

coil cases

61, 62, 63, . . . cover the

coils

51, 52, 53, . In such a case, when the electromagnetic device 6 is used, the magnetic flux of the coil 51 and the like can be prevented from leaking to the outside of the coil case 61 and the like. It is advantageous if the motor is a Of course, the coil case 61 shown in FIG. 6A may also be used for other electromagnetic devices 6, such as reactors and transformers.

FIG. 7 is a top view of a core body of an electromagnetic device in another embodiment. The core body 5 shown in FIG. 7 includes a substantially octagonal outer core 20 and four core coils 31 to 34 arranged inside the outer core 20 and similar to those described above. . These core coils 31 to 34 are arranged at regular intervals in the circumferential direction of the core body 5 . Moreover, the number of iron cores is preferably an even number of 4 or more, so that the reactor as the electromagnetic device 6 can be used as a single-phase reactor.

As can be seen from the drawing, the outer peripheral core 20 is composed of four outer peripheral core portions 24 to 27 divided in the circumferential direction. Each core coil 31-34 includes a radially extending core 41-44 and coils 51-54 attached to the core. Radial outer ends of cores 41 to 44 are formed integrally with outer core portions 21 to 24, respectively. It should be noted that the number of cores 41-44 does not necessarily have to match the number of outer core portions 24-27.

Furthermore, the radially inner ends of the iron cores 41 to 44 are located near the center of the outer peripheral iron core 20 . In FIG. 7, the radially inner ends of the cores 41-44 converge toward the center of the outer core 20, and the tip angle is approximately 90 degrees. The radially inner ends of cores 41-44 are then separated from each other by magnetically coupleable gaps 101-104.

Also in FIG. 7, at least three coils 51 to 54 are accommodated in coil cases 61 to 64 similar to those described above. It will therefore be seen that the height of the coil cases 61-64 can be adjusted when the height of the electromagnetic device 6 changes, thereby eliminating the need to change the coil cases.

Furthermore, FIGS. 8A and 8B are cross-sectional views of core bodies included in electromagnetic devices according to other embodiments. A transformer is shown as an example of the electromagnetic device 6 in these drawings. Since FIGS. 8A and 8B are similar to FIGS. 1A and 7, respectively, the description of the members already described will be omitted. 8A and 8B, the radially inner ends of cores 41-43 (44) abut against the radially inner ends of adjacent cores 41-43 (44). Therefore, the electromagnetic device 6 shown in FIGS. 8A and 8B does not include gaps 101-103 (104).

Also in FIGS. 8A and 8B, the coils 51 to 53 (54) are housed in coil cases 61 to (63) 64 similar to those described above. It will therefore be seen that the height of the coil cases 61-63 can be adjusted when the height of the electromagnetic device 6 changes, thereby eliminating the need to change the coil cases.

Aspects of the Present Disclosure According to a first aspect, a core body (5) having a plurality of iron cores (41-44), coils (51-54) to be attached to each of the plurality of iron cores, and a coil case (61 to 64) that at least partially covers each of a plurality of iron cores and insulates them from the coil, wherein the coil case is divided into two in the axial direction of the core body; An electromagnetic device (6) is provided that includes a case portion (61a) and a second coil case portion (61b).
According to a second aspect, in the first aspect, each of the first coil case portion and the second coil case portion includes a fitting portion (70) that slidably fits together.
According to a third aspect, in the second aspect, the fitting portion of the second coil case portion is inserted inside the fitting portion of the first coil case portion.
According to a fourth aspect, in the second aspect, the mating portion of the first coil case portion and the mating portion of the second coil case portion are respectively connected to the first coil case portion and the second coil case portion. It includes thin portions (71a, 71b) that are thinner than the thickness of the two coil case portions, and the thin portion of the first coil case portion extends outside the coil case more than the thin portion of the second coil case portion. placed on one side.
According to a fifth aspect, in the fourth aspect, one of the concave portion (71c) and the convex portion (71d) that are fitted to each other is formed adjacent to the thin portion of the first coil case portion. The other of the concave portion and the convex portion is formed adjacent to the thin portion of the thin portion of the second coil case portion.
According to a sixth aspect, in the first aspect, the coil case covers the coil over its entire circumference.
According to a seventh aspect, in any one of the first to sixth aspects, the core body includes an outer core (20) composed of a plurality of outer core portions (24 to 27). and said plurality of cores are at least three cores coupled to said plurality of outer core portions, wherein radially inner ends of each of said at least three cores converge toward the center of said outer core. ing.
According to an eighth aspect, in any one of the first to sixth aspects, the plurality of iron cores protrude from one surface of the flat or curved substrate portion of the core body at equal intervals.
According to the ninth aspect, in the coil case (61-64), the first coil case portion (61a) and the second and a coil case portion (61b), wherein each of the first coil case portion and the second coil case portion includes a fitting portion (70) slidably fitted to each other.
According to a tenth aspect, in the ninth aspect, the fitting portion of the second coil case portion is inserted into the fitting portion of the first coil case portion.
According to an eleventh aspect, in the ninth aspect, each of the fitting portion of the first coil case portion and the fitting portion of the second coil case portion includes the first coil case portion and the second coil case portion. It includes thin portions (71a, 71b) that are thinner than the thickness of the two coil case portions, and the thin portion of the first coil case portion extends outside the coil case more than the thin portion of the second coil case portion. placed on one side.
According to a twelfth aspect, in the eleventh aspect, one of the concave portion (71a) and the convex portion (71b) that engage with each other is formed adjacent to the thin portion of the first coil case portion. The other of the concave portion and the convex portion is formed adjacent to the thin portion of the thin portion of the second coil case portion.
According to a thirteenth aspect, in the ninth aspect, the coil case covers the entire circumference of the coil.

Effects of Aspects In the first aspect, the coil case is divided into two in the height direction of the core body, so that the divided coil cases are arranged on the upper end side and the lower end side of the coil, respectively. As a result, the coil can be supported by its upper and lower ends, so there is no need to prepare a separate coil case. Therefore, even if the height of the electromagnetic device changes, it is possible to eliminate the need to change the coil case.
In the second and ninth aspects, the height of the coil case can be adjusted.
In the third and tenth aspects, the height of the coil case can be adjusted with a simple configuration.
In the fourth and eleventh aspects, a sufficient insulation distance can be secured between the iron core and the coil.
In fifth and twelfth aspects, bonding strength can be increased.
In the sixth and thirteenth aspects, magnetic flux can be prevented from leaking from the coil case over the entire coil case.
In a seventh aspect, the electromagnetic equipment can be used as a reactor or transformer.
In an eighth aspect, the electromagnetic machine can be used as a linear motor or as a motor stator.

Although the embodiments of the present invention have been described above, it will be understood by those skilled in the art that various modifications and changes can be made without departing from the disclosure scope of the claims to be described later.

5 core body 6 electromagnetic device 20 outer core 24-27, 24' outer core 31-34 core coil 41-44 core 51-54 coil 61-64 coil case 61a first coil case portion 61b second coil case portion 70 fitting portion 70a projection 70b engagement portion 70c through

hole

71a, 71b thin portion 71c recess 71d projection 81a,

81b housing

82a, 82b hollow projection 85 upper surface 101 to 104 gap

Claims

a core body having a plurality of iron cores;
a coil to be attached to each of the plurality of iron cores;
a coil case that at least partially covers each of the plurality of iron cores and insulates them from the coil;
The electromagnetic device, wherein the coil case includes a first coil case portion and a second coil case portion that are divided into two in the axial direction of the core body.
The electromagnetic device according to claim 1, wherein each of said first coil case portion and said second coil case portion includes a fitting portion that is slidably fitted to each other.
The electromagnetic device according to claim 2, wherein said fitting portion of said second coil case portion is inserted into said fitting portion of said first coil case portion.
Each of the fitting portion of the first coil case portion and the fitting portion of the second coil case portion includes a thin portion that is thinner than the thickness of the first coil case portion and the second coil case portion. cage,
3. The electromagnetic device according to claim 2, wherein said thin portion of said first coil case portion is arranged on the outer side of said coil case with respect to said thin portion of said second coil case portion.
one of a concave portion and a convex portion that are fitted to each other is formed adjacent to the thin portion of the first coil case portion;
5. The electromagnetic device according to claim 4, wherein the other of said concave portion and convex portion is formed adjacent to said thin portion of said thin portion of said second coil case portion.
The electromagnetic device according to claim 1, wherein the coil case covers the coil over its entire circumference.
The core body includes an outer core composed of a plurality of outer core parts,
the plurality of cores are at least three cores coupled to the plurality of outer core portions;
7. The electromagnetic device according to any one of claims 1 to 6, wherein the radially inner ends of each of said at least three cores converge toward the center of said outer peripheral core.
The electromagnetic device according to any one of claims 1 to 6, wherein the plurality of iron cores protrude from one surface of the flat or curved substrate portion of the core body at regular intervals.
In the coil case,
comprising a first coil case portion and a second coil case portion which are divided into two in the direction perpendicular to the central axis of the coil to be housed in the coil case;
A coil case, wherein each of the first coil case portion and the second coil case portion includes a fitting portion that is slidably fitted to each other.
The coil case according to claim 9, wherein said fitting portion of said second coil case portion is inserted inside said fitting portion of said first coil case portion.
Each of the fitting portion of the first coil case portion and the fitting portion of the second coil case portion includes a thin portion that is thinner than the thickness of the first coil case portion and the second coil case portion. cage,
10. The coil case according to claim 9, wherein said thinned portion of said first coil case portion is arranged on the outer side of said coil case with respect to said thinned portion of said second coil case portion.
one of a concave portion and a convex portion that are fitted to each other is formed adjacent to the thin portion of the first coil case portion;
12. The coil case according to claim 11, wherein the other of said recess and protrusion is formed adjacent to said thin portion of said thin portion of said second coil case portion.
The coil case according to claim 9, wherein the coil case covers the coil over its entire circumference.