JP7364491B2 - core body - Google Patents

Description

The present invention relates to a core body.

In recent years, reactors have been developed that include a core body including an outer peripheral core and a plurality of cores arranged inside the outer peripheral core. The outer circumferential core may be composed of a plurality of circumferentially divided outer circumferential core portions (for example, see Cited Document 1).

Japanese Patent Application Publication No. 2018-195783

However, when the outer core portions are assembled to each other to create a core body, a gap may occur between adjacent outer core portions. A reactor equipped with a core body including such a gap has a problem of reduced inductance.

In order to deal with such problems, it is conceivable to wrap a metal band member around the outer peripheral surface of the core body to tighten the core body. However, since the step of winding the band member is increased, the manufacturing time is increased. Furthermore, since the tightening accuracy differs depending on the operator, a situation may arise in which an unskilled operator is unable to eliminate the gap between adjacent outer peripheral core portions. Therefore, operator skill is required to properly tighten the core body.

Therefore, there is a need for a core body that can easily eliminate gaps between adjacent outer core portions in a short time without requiring a high level of skill on the part of the operator.

According to a first aspect of the present disclosure, in the core body, an outer circumferential core configured of a plurality of circumferentially divided outer circumferential core portions, and a plurality of outer circumferential core portions each coupled to an inner surface of the plurality of outer circumferential core portions at least three cores, a radially inner end of each of the at least three cores converging toward the center of the outer core, and converging with one of the at least three cores. A magnetically connectable gap is formed between the one iron core and another adjacent iron core, and the radially inner ends of the at least three iron cores form the magnetically connectable gap. and a tightening portion that tightens the outer peripheral iron core in the axial direction of the core body; and pressing members that press against each other radially inwardly.

In the first aspect, the outer peripheral core portions are automatically pressed against each other toward the radially inner side of the core body in response to the tightening action of the tightening portion. Therefore, the gap between the adjacent outer peripheral core portions can be easily eliminated in a short time without requiring a high level of skill on the part of the operator.

Objects, features, and advantages of the present invention will become more apparent from the following description of embodiments in conjunction with the accompanying drawings.

It is an exploded perspective view of a reactor based on a first embodiment. FIG. 1B is a perspective view of the reactor shown in FIG. 1A. It is a sectional view of a core body included in a reactor based on a first embodiment. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. FIG. 7 is a top view of a reactor based on another embodiment. FIG. 7 is a top view of a reactor based on yet another embodiment. It is a figure showing a modification of the first embodiment. FIG. 1A is a diagram similar to FIG. 1A showing another modification of the first embodiment. It is an exploded perspective view of a reactor based on a second embodiment. FIG. 7A is a perspective view of the reactor shown in FIG. 7A. FIG. 7A is a diagram similar to FIG. 7A showing a modification of the second embodiment. FIG. 7 is an end view of a reactor based on another embodiment. FIG. 7 is a partial end view of a reactor based on yet another embodiment. FIG. 2 is a perspective view of a reactor in the prior art.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Corresponding components are given common reference numerals throughout the drawings.

In the following description, a three-phase reactor will be mainly explained as an example, but the application of the present disclosure is not limited to three-phase reactors, but can be widely applied to multi-phase reactors that require a constant inductance in each phase. be. Further, the reactor according to the present disclosure is not limited to being provided on the primary side and secondary side of an inverter in an industrial robot or a machine tool, but can be applied to various devices.

FIG. 1A is an exploded perspective view of a reactor based on the first embodiment, and FIG. 1B is a perspective view of the reactor shown in FIG. 1A. The reactor 6 shown in FIGS. 1A and 1B mainly includes a core body 5, an annular end plate 81 and a pedestal 60 that are fastened to sandwich the core body 5 in the axial direction. The end plate 81 and the pedestal 60 are in contact with the outer circumferential core 20 over the entire edge of the end face of the outer circumferential core 20, which will be described later, of the core body 5.

The end plate 81 and the pedestal 60 are preferably made of a non-magnetic material such as aluminum, SUS, resin, etc. The pedestal 60 is formed with an opening 68 having an outer shape suitable for placing the end surface of the core body 5. The end plate 81 has an outer shape that partially corresponds to the end surface of the outer peripheral core 20, and the opening 88 formed in the end plate 81 generally corresponds to the inner peripheral surface of the outer peripheral core 20. It is the shape. The opening 68 formed in the base 60 and the opening 88 formed in the end plate 81 are large enough to allow the coils 51 to 53 (described later) to protrude from the end surface of the core body 5. Further, the height of the pedestal 60 is slightly longer than the protruding height of the coils 51 to 53 protruding from the end of the core body 5.

FIG. 2 is a sectional view of the core body included in the reactor based on the first embodiment. As shown in FIG. 2, the core body 5 includes an outer peripheral core 20 and three core coils 31 to 33 that are magnetically connected to the outer peripheral core 20. In FIG. 2, core coils 31 to 33 are arranged inside an outer peripheral core 20 having a substantially hexagonal cross section. These iron core coils 31 to 33 are arranged at equal intervals in the circumferential direction of the core body 5. Note that the outer peripheral core 20 may be circular or other approximately regular even-numbered square shape. Moreover, it is preferable that the number of iron core coils is a multiple of 3, so that the reactor 6 can be used as a three-phase reactor.

As can be seen from the drawings, each of the core coils 31 to 33 includes cores 41 to 43 extending only in the radial direction of the outer peripheral core 20, and coils 51 to 53 wound around the cores. The radially outer end of each of the cores 41 to 43 is in contact with the outer core 20 or is formed integrally with the outer core 20. Note that in some of the drawings, illustration of the coils 51 to 53 is omitted for the purpose of brevity.

In FIG. 2, the outer circumferential core 20 is composed of a plurality of, for example, three outer circumferential core portions 24 to 26, which are divided at equal intervals in the circumferential direction. The outer peripheral core portions 24 to 26 are integrally formed with the cores 41 to 43, respectively. The outer core 20 and the outer core parts 24 to 26 are made by laminating a plurality of magnetic plates, such as iron plates, carbon steel plates, and electromagnetic steel plates, or from a dust core. In this way, when the outer circumferential core 20 is composed of a plurality of outer circumferential core parts 24 to 26, even if the outer circumferential core 20 is large-sized, such an outer circumferential core 20 can be easily manufactured. can. In addition, through holes 29a to 29c are formed in the outer peripheral core portions 24 to 26.

Further, the radially inner end portions of each of the cores 41 to 43 are located near the center of the outer peripheral core 20. In the drawing, the radially inner ends of each of the cores 41 to 43 converge toward the center of the outer core 20, and the tip angle thereof is about 120 degrees. The radially inner ends of the iron cores 41 to 43 are spaced apart from each other via magnetically connectable gaps 101 to 103.

In other words, the radially inner end of the iron core 41 is spaced apart from the radially inner ends of the two adjacent iron cores 42, 43 via the gaps 101, 102. The same applies to the other cores 42 and 43. Note that the dimensions of the gaps 101 to 103 are assumed to be equal to each other.

In this manner, the present invention does not require a central iron core located at the center of the core body 5, so that the core body 5 can be constructed in a lightweight and simple manner. Furthermore, since the three core coils 31 to 33 are surrounded by the outer core 20, the magnetic fields generated from the coils 51 to 53 do not leak to the outside of the outer core 20. Furthermore, since the gaps 101 to 103 can be provided with any thickness at low cost, this is advantageous in terms of design compared to reactors with conventional structures.

Furthermore, in the core body 5 of the present invention, the difference in magnetic path length between phases is reduced compared to a reactor having a conventional structure. Therefore, in the present invention, it is also possible to reduce the unbalance of inductance caused by the difference in magnetic path length.

FIG. 3 is a cross-sectional view taken along line AA in FIG. As shown in FIG. 3, a plurality of inclined members 70 are provided on the back surface of the end plate 81 and are arranged at an angle with respect to the end plate 81. The inclined member 70 extends downward from the back surface of the end plate 81 toward the outside in the radial direction of the reactor 6 . Further, it is preferable that the angle formed between the back surface of the end plate 81 and the inclined member 70 is an acute angle.

Similarly, a plurality of inclined members 70 are provided on the top surface of the pedestal 60 so as to be inclined with respect to the top surface of the pedestal 60. The inclined member 70 extends upward from the top surface of the pedestal 60 toward the outside in the radial direction of the reactor 6. Similarly, it is preferable that the angle between the top surface of the pedestal 60 and the inclined member 70 is an acute angle.

As can be seen from FIG. 1A and the like, the inclined member 70 is provided on the end plate 81 and the pedestal 60 at a position corresponding to the outer peripheral surface of the outer peripheral core portions 24 to 26. More specifically, the inclined member 70 is provided on the end plate 81 and the pedestal 60 at a position corresponding to the center position of the outer peripheral surface of the outer peripheral core portions 24 to 26 corresponding to the cores 41 to 43. The end plate 81 and the inclined member 70 of the pedestal 60 are preferably formed by bending the plate materials that constitute the end plate 81 and the pedestal 60. Thereby, the inclined member 70 can be easily formed.

After winding the coils 51 to 53 around the cores 41 to 43, the outer core portions 24 to 26 are assembled together to form the core body 5. Then, as can be seen with reference to FIG. 1A, one end of the core body 5 is placed on the pedestal 60, and the end plate 81 is placed on the other end of the core body 5. When the plurality of bolts 99 are inserted into the through holes 89 of the end plate 81, each of the shaft portions of the plurality of bolts 99 passes through the through holes 29a to 29c of the outer peripheral core 20, and the tips of the plurality of bolts 99 are attached to the pedestal. It is screwed into the through hole 69 of 60. Thereby, the outer peripheral core 20 can be tightened in the axial direction of the core body 5 and can be firmly fixed between the end plate 81 and the pedestal 60. For this purpose, threads may be formed on the inner peripheral surfaces of the through holes 69 and/or the through holes 89, and screws, nuts, etc. (not shown) may be used instead of the bolts 99. good.

Since the through holes 29a to 29c are formed in the outer core portions 24 to 27, the outer core 20 is tightened in the axial direction of the core body 5 by the bolts 99. In other words, the bolts 99 and the like serve as a tightening portion that tightens the outer peripheral core 20. Since the outer peripheral core portions 24 to 26 are engaged with the pressing member 70, the outer peripheral core portions 24 to 27 are automatically pressed radially inward due to such tightening action. In other words, the inclined member 70 and the later-described inclined members 70', 70A, and 70B push the outer peripheral core portions 24 to 26 toward each other toward the inside of the core body 5 in the radial direction in response to the tightening action of the bolt 99. It fulfills its role as a member.

Therefore, the gaps between the mutually adjacent outer peripheral core portions 24 to 27 can be eliminated easily and in a short time without requiring the operator's skill. Note that the inclined member 70 and the like are preferably formed from the same material as the base 60 or the end plate 81. Furthermore, since the end plate 81 and the pedestal 60 are provided with the inclined member 70, etc., the above-mentioned effects can be obtained with a simple configuration. Furthermore, since the inclined member 70 is disposed at a position corresponding to the center of the outer peripheral surface of the outer peripheral core portions 24 to 26, the inclined member 70 can press the outer peripheral core toward the center axis of the reactor with an even force. , As a result, the above-mentioned gap can be easily eliminated.

FIG. 11 is a perspective view of a reactor in the prior art. As shown in FIG. 11, in the prior art, it was necessary to wind the band member B around the outer peripheral surface of the outer peripheral core 20. For this reason, in the conventional technology, not only does the manufacturing time increase, but also the skill level of the operator is required to wrap the band member B.

FIG. 4A is a top view of a reactor according to another embodiment. For clarity, end plate 81 is not shown in FIG. 4A. In FIG. 4A, a pair of inclined members 70 are provided on the base 60 at positions corresponding to the outer peripheral core portions 24 to 26, respectively. Each of the pair of inclined members is arranged at a position corresponding to the side surface of the iron cores 41 to 43. Since the pair of inclined members 70 are used for each of the outer core portions 24 to 26, the outer core portions 24 to 26 can be pressed radially inward of the core body 5 more accurately. Therefore, it will be understood that the above-mentioned effects can be enhanced.

Furthermore, in FIG. 4A, an additional ramp member 70' is further positioned on the pedestal 60. More specifically, a pair of inclined members 70' are further arranged at positions corresponding to the engagement surfaces between the mutually adjacent outer peripheral core portions 24-26. For example, one of the pair of inclined members 70' is disposed on the outer circumferential core portion 24, and the other inclined member is disposed on the adjacent outer circumferential core portion 25. Therefore, the engagement surface between the outer peripheral core portions 24 and 25 is located between the pair of inclined members 70'. In such a case, the outer circumferential core portions 24 to 26 can be pressed toward each other inward in the radial direction of the core body 5 without the adjacent outer circumferential core portions 24 to 26 being displaced from each other.

FIG. 4B is a top view of a reactor based on yet another embodiment. In FIG. 4B, one inclined member 70A is arranged to straddle the engagement surface between two adjacent outer peripheral core portions 24 to 26. In this case, even if the inclined member 70 is removed, the inclined member 70A alone can move the outer circumferential core portions 24 to 26 into the core body without causing the adjacent outer circumferential core portions 24 to 26 to shift relative to each other. 5 can be pressed against each other radially inwardly. Further, if the inclined member 70 is not removed, the outer peripheral core portions 24 to 26 can be pressed even more firmly toward the radially inward side of the core body 5.

FIG. 5 is a diagram showing a modification of the first embodiment. In FIG. 5, the engaging surfaces of two adjacent outer peripheral core portions 24 and 25 are shown. The end plate 81 and pedestal 60 shown in FIG. 5 are larger than those shown in FIG. 1A. The through hole 89 of the end plate 81 and the through hole 69 of the pedestal 60 are arranged radially outward compared to the case shown in FIG. 1A. As a result, the bolts 99 inserted into the through holes 89 and 69 are positioned radially outside of the inclined member 70.

In FIG. 5, since the bolt 99 is located radially outward than the inclined member 70, when the bolt 99 is tightened, a force that presses the outer peripheral core portions 24 to 26 toward the radially inward side of the core body 5 is applied. is easy to act on. Therefore, it is possible to reliably eliminate gaps between adjacent outer peripheral core portions 24 to 26.

FIG. 6 is a diagram similar to FIG. 1A showing another modification of the first embodiment. The inclined member 70B in FIG. 6 is a separate member from the end plate 81 and the pedestal 60. The inclined member 70B is a bar inserted into a hole formed in advance in the end plate 81 and the pedestal 60 so as to be inclined at a predetermined angle. Therefore, compared to the case of bending (FIG. 1A), the inclination angle of the inclination member 70 can be managed more accurately. Therefore, in the case shown in FIG. 6, it is easier to eliminate gaps between adjacent outer peripheral core portions 24-26.

FIG. 7A is an exploded perspective view of a reactor based on the second embodiment, and FIG. 7B is a perspective view of the reactor shown in FIG. 7A. In these drawings, instead of the inclined member 70, a pair of other pressing members 70C are shown. Each pressing member 70C is provided with leg portions 71a to 71c in the same number as the plurality of iron cores 41 to 43. It is preferable that the width of the leg portions 71a to 71c is less than or equal to the width of the iron cores 41 to 43. These leg portions 71a to 71c extend radially outward from the center of one end of the outer peripheral core 20. It is preferable that the length of the legs 71a to 71c is equal to or longer than the radius of the outer peripheral core 20.

Extension portions 72a to 72c extend from the tips of the legs 71a to 71c in the axial direction of the core body 5 toward the other end of the outer peripheral core 20. Preferably, the length of the extensions 72a to 72c is approximately half the height of the core body 5 in the axial direction. Further, plate-shaped support portions 73a to 73c extend radially outward from the tips of the extension portions 72a to 72c. Therefore, legs 71a-71c and extensions 72a-72c are generally perpendicular to each other, and extensions 72a-72c and supports 73a-73c are generally perpendicular to each other. Therefore, the legs 71a-71c and the supports 73a-73c are generally parallel to each other.

Furthermore, through holes are formed in the support parts 73a to 73c. It is preferable that the pressing member 70C is made by bending a single plate material, thereby avoiding an increase in the manufacturing cost of the pressing member 70C.

As shown in FIG. 7A, the pair of pressing members 70C are positioned so that the outer peripheral core 20 is accommodated therebetween. As a result, the inner surfaces of the legs 71a to 71c of one pressing member 70C come into contact with one end of the iron cores 41 to 43, and the inner surfaces of the legs 71a to 71c of the other pressing member 70C contact the other ends of the iron cores 41 to 43. come into contact.

Then, as shown in FIG. 7B, the respective extensions 72a to 72c of the pair of pressing members 70C are arranged on the outer peripheral surface of the outer peripheral core 20. Further, the support portions 73a to 73c of one pressing member 70C face the support portions 73a to 73c of the other pressing member 70C, respectively, or come into contact with each other.

Next, short bolts 99 (not shown in FIG. 7B) are passed through the through holes of the two opposing supports 73a to 73c and tightened. Preferably, threads are formed in the through holes of the supporting parts 73a to 73c. Nuts (not shown) may be used in addition to bolts 99 to enhance the tightening action.

Since the extensions 72a to 72c and the supports 73a to 73c are substantially perpendicular to each other, when the two opposing supports 73a to 73c are tightened with the bolts 99, the tightening force is transmitted to the extensions 72a to 72c. Since the extensions 72a to 72c are connected to each other via the legs 71a to 71c, the tightening action of the bolts 99 forces the outer core portions 24 to 26 toward each other inward in the radial direction of the core body 5. It becomes like this. Therefore, it can be seen that the same effect as described above can be obtained. Furthermore, in this case, the end plate 81 and the pedestal 60 are not required, so a simple configuration is sufficient. Note that the lengths of the respective extension portions 72a to 72c may be different from each other between the pair of pressing members 70C.

FIG. 8 is a diagram similar to FIG. 7A showing a modification of the second embodiment. In FIG. 8, two pressing members 70C' and 70C'' are used instead of the pair of pressing members 70C. In one pressing member 70C', the extension portions 72a to 72c of the pressing member 70C described above are removed, and the legs 71a to 71c and the supporting portions 73a to 73c are connected to each other. In other words, the pressing member 70C' is a flat member. The other pressing member 70C'' has the same shape as the pressing member 70C described above, except that it has approximately twice the length of the extensions 72a to 72c of the pressing member 70C described above.

The outer peripheral core 20 is inserted into the extensions 72a to 72c of the pressing member 70C'', and the pressing member 70C' is placed on the top surface of the outer peripheral core 20 so as to have the same positional relationship as in FIG. 7B. Then, the support parts 73a to 73c of the pressing member 70C' and the support parts 73a to 73c of the pressing member 70C'' are tightened with the bolts 99 as described above. In this way, even when the pressing members 70C' and 70C'' are used, the same effects as described above can be obtained.

FIG. 9 is an end view of a reactor based on another embodiment. The core body 5 shown in FIG. 9 includes a substantially octagonal outer peripheral core 20 and four core coils 31 to 34 similar to those described above, which are arranged inside the outer peripheral core 20. . These iron core coils 31 to 34 are arranged at equal intervals in the circumferential direction of the core body 5. Moreover, it is preferable that the number of iron cores is an even number of 4 or more, so that the reactor provided with the core body 5 can be used as a single-phase reactor.

As can be seen from the drawings, the outer peripheral core 20 is composed of four outer peripheral core parts 24 to 27 divided in the circumferential direction. Each of the core coils 31 to 34 includes a radially extending core 41 to 44 and a coil 51 to 54 attached to the core. The radially outer end portions of the cores 41 to 44 are integrally formed with the outer core portions 21 to 24, respectively. Note that the number of cores 41 to 44 and the number of outer core portions 24 to 27 do not necessarily have to match.

Furthermore, the radially inner end portions of each of the cores 41 to 44 are located near the center of the outer peripheral core 20. In FIG. 9, the radially inner ends of each of the cores 41 to 44 converge toward the center of the outer core 20, and the tip angle thereof is about 90 degrees. The radially inner ends of the cores 41 to 44 are spaced apart from each other via magnetically connectable gaps 101 to 104.

It is clear to those skilled in the art that the pedestal 60 and end plate 81 having a shape corresponding to the reactor shown in FIG. 9 and having the inclined member 70 similar to those described above can be applied. Further, it is clear to those skilled in the art that pressing members 70C, 70C', 70C'', etc. having corresponding shapes can be applied to the reactor shown in FIG. 9.

FIG. 10 is a partial end view of a reactor based on yet another embodiment. In FIG. 10, a groove 25A extending in the axial direction is formed on the outer peripheral surface of the outer peripheral core portion 25 at a position corresponding to the core 42. As shown in FIG. Similar grooves 24A, 26A may be formed at similar positions in the outer core portions 24, 26. The inclined member 70 of the base 60 engages with these grooves and serves to properly position the outer core portions 24-26. Therefore, the tightening action by the inclined member 70 and the like can be easily performed, and as a result, the gaps between the adjacent outer peripheral core portions 24 to 26 can be more easily eliminated.

Aspects of the Present Disclosure According to a first aspect, in the core body (5), an outer circumferential core (20) configured from a plurality of circumferentially divided outer circumferential core portions (24 to 27); at least three cores (41 to 44) each coupled to an inner surface of an outer core portion of the core, and a radially inner end of each of the at least three cores extends toward the center of the outer core. a magnetically connectable gap (101 to 104) is formed between one of the at least three iron cores and another iron core adjacent to the one iron core; The radially inner ends of the at least three cores are spaced apart from each other via a magnetically connectable gap, and further include a tightening portion (99) for tightening the outer peripheral core in the axial direction of the core body. ), a pressing member (70, 70', 70A, 70B, 70C) that presses the outer peripheral core portions toward each other inward in the radial direction of the core body in accordance with the tightening action of the tightening portion; A core body is provided.
According to a second aspect, the core body according to the first aspect further includes an end plate (81) attached to one end surface of the core body, and a pedestal (60) attached to the other end surface of the core body. However, the pressing member is an inclined member (70, 70', 70A, 70B) arranged at an angle with respect to the end plate and the pedestal.
According to a third aspect, in the second aspect, the inclined member is arranged at a position corresponding to each of the cores on the outer peripheral surface of the plurality of outer peripheral core portions.
According to a fourth aspect, in the second or third aspect, the inclined member is arranged at a position corresponding to an engagement surface between mutually adjacent outer peripheral core portions.
According to the fifth aspect, the first aspect includes two pressing members (70C), and at least one of the two pressing members extends radially outward from the center of the end face of the outer peripheral core. at least three extending legs (71a to 71c); at least three extensions (72a to 72c) extending from the tips of the at least three legs in parallel to the axial direction of the outer peripheral core; and at least three support portions (73a to 73c) extending radially outward from the outer peripheral core.
According to a sixth aspect, in any one of the first to fifth aspects, the outer peripheral surface of the outer peripheral core portion is provided with grooves (24A to 26A) extending parallel to the axial direction of the outer peripheral core. is formed.
According to a seventh aspect, in any one of the first to sixth aspects, the number of the at least three iron cores is a multiple of three.
According to an eighth aspect, in any one of the first to sixth aspects, the number of the at least three iron cores is an even number of 4 or more.

Effects of Aspects In the first aspect, the outer peripheral core portions are automatically pressed toward each other inward in the radial direction of the core body in response to the tightening action of the tightening portion. Therefore, the gap between the adjacent outer peripheral core portions can be easily eliminated in a short time without requiring a high level of skill on the part of the operator.
In the second aspect, since the pressing member is provided on the end plate and the pedestal, a simple configuration is required.
In the third aspect, the inclined member can press the outer peripheral core toward the central axis of the reactor with uniform force.
In the fourth aspect, the outer peripheral core portion can be more firmly pressed radially inward of the core body.
In the fifth aspect, an end plate and a pedestal are not required, so a simple configuration is possible.
In a sixth embodiment, the reactor can be used as a three-phase reactor.
In a seventh aspect, the reactor can be used as a single phase reactor.

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

5 Core body 6 Reactor 20 Outer core 24-27 Outer core 24A-26A Groove 29a-29c Through-hole 31-34 Core coil 41-44 Core 51-54 Coil 60 Pedestal 69 Through-hole 70, 70', 70A, 70B Inclined member (pressing member)
70C Pressing member 71a-71c Leg portion 72a-72c Extension portion 73a-73c Support portion 81 End plate 89 Through hole 99 Bolt (tightening portion)
101-104 Gap

Claims (8)

In the core body,
an outer core composed of a plurality of outer core portions divided in the circumferential direction;
at least three cores each coupled to an inner surface of the plurality of outer peripheral core portions,
radially inner ends of each of the at least three cores converge toward the center of the outer core;
A magnetically connectable gap is formed between one of the at least three iron cores and another iron core adjacent to the one iron core, and the radially inner side of the at least three iron cores is formed. the ends are spaced apart from each other via a magnetically connectable gap;
moreover,
a tightening portion that tightens the outer peripheral iron core in the axial direction of the core body;
A core body comprising: a pressing member that presses the outer peripheral core portions toward each other inward in the radial direction of the core body in response to a tightening action of the tightening portion. Furthermore, an end plate attached to one end surface of the core body;
and a pedestal attached to the other end surface of the core body,
The core body according to claim 1, wherein the pressing member is an inclined member arranged at an angle with respect to the end plate and the pedestal. The core body according to claim 2, wherein the inclined member is arranged at a position corresponding to each of the cores on the outer peripheral surface of the plurality of outer peripheral core portions. The core body according to claim 2 or 3, wherein the inclined member is arranged at a position corresponding to an engagement surface between adjacent outer peripheral core portions. It includes two of the pressing members,
At least one of the two pressing members has at least three legs extending radially outward from the center of the end face of the outer peripheral core, and a portion extending from the tips of the at least three legs in the axial direction of the outer peripheral core. The core body according to claim 1, comprising at least three extensions extending in parallel and at least three support parts extending radially outward of the outer core from the at least three extensions. The core body according to any one of claims 1 to 5, wherein a groove extending parallel to an axial direction of the outer peripheral core is formed on the outer peripheral surface of the outer peripheral core. A core body according to any one of claims 1 to 6, wherein the number of at least three iron cores is a multiple of three. The core body according to any one of claims 1 to 6, wherein the number of the at least three iron cores is an even number of 4 or more.

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