JP2019207962A - Stationary induction apparatus and manufacturing method of the stationary induction apparatus - Google Patents

Abstract

To obtain a stationary induction apparatus capable of simply coating all of an iron core at high accuracy.SOLUTION: A stationary induction apparatus includes: an iron core having a yoke and a leg; a winding 2 formed by being wound to the leg, and having an insertion hole 2I in which the leg is inserted; a cylinder part 51 which is inserted from one end part side to the insertion hole 2I from one end side of the insertion hole 2I, and having a gap 51B formed toward the other end part side from one end part side; an iron core coating member 5 provided in an end part 51T of the cylinder part 51, and having a bending part coating the yoke; a cylinder part 61 that is inserted from one end part side to the insertion hole 2I from the other end side of the insertion hole 2I, and overlapped on one end part side in the cylinder part 51 and the insertion hole 2I; and an iron core coating member 6 provided on the other end part of the cylinder part 61, and having the folding part coating the yoke. The cylinder part 61 has a gap 61B formed toward the other end part side of the cylinder part 61 from one end part side of the cylinder part 61 at a position different from the gap 51B in a part overlapped with the cylinder part 51.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a static inductor having a structure in which a winding is arranged around an iron core and a method for manufacturing the static inductor.

  When the iron core of the stationary inductor is an amorphous alloy, since the amorphous alloy is fragile, the iron core is easily broken. There is a possibility that broken pieces of the iron core will be scattered around the stationary inductor. If iron core fragments are scattered around the stationary inductor, the insulation performance of the stationary inductor may be reduced. For this reason, it is necessary to take measures such as covering the entire core in order to prevent the fragments of the iron core from being scattered around the stationary inductor.

  As a method of covering the entire iron core, Patent Document 1 proposes a method of using an iron core cover having a tube portion and flange portions provided at both ends of the tube portion and inserting the tube portion of the iron core cover into the winding. In the method described in Patent Document 1, the yoke of the iron core is covered with a bent flange portion, and the legs of the iron core are covered with a cylindrical portion inserted into the winding.

JP-A-5-190342

  However, in the technique described in Patent Document 1 described above, in a static inductor having a plurality of windings, an independent flange portion is provided for each winding. Therefore, when covering the yoke of the iron core, the flange portions are pasted together. Work to attach is necessary. For this reason, the man-hour for covering the whole iron core will increase. Further, in the technique described in Patent Document 1 described above, depending on manufacturing errors of the winding or the cylindrical portion, it is difficult to insert the cylindrical portion into the winding, or the contact area between the winding and the cylindrical portion is reduced. End up.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the stationary inductor which can cover the whole iron core easily and accurately.

  In order to solve the above-described problems and achieve the object, a stationary inductor according to the present invention is formed by winding an iron core having a first yoke, a second yoke, and a leg, and the leg is wound. And a winding having an insertion hole inserted therein. The stationary inductor is inserted into the insertion hole from one end side from one end side of the insertion hole, and has a first cut formed from one end side toward the other end side. It has a 1st core covering member which has a cylindrical member and the 1st bent part which is provided in the other end of the 1st cylindrical member, and covers the 1st yoke. The stationary inductor is inserted into the insertion hole from one end side from the other end side of the insertion hole and overlaps with the first cylindrical member on one end side in the insertion hole. And a second iron core covering member that is provided at the other end of the second cylindrical member and has a second bent portion that covers the second yoke. The second cylindrical member is a second cylindrical member from one end side of the second cylindrical member at a position different from the first cut in the portion overlapping the first cylindrical member. 2nd cut | interruption formed toward the other edge part side.

  According to the present invention, the entire iron core can be covered easily and accurately.

1 is a perspective view of a stationary inductor to which an iron core covering member according to a first embodiment of the present invention is applied. The front view of the iron core which the stationary inductor concerning Embodiment 1 of the present invention has The perspective view for demonstrating the iron core covering member concerning Embodiment 1 of this invention Sectional drawing of the iron core covering member in the state by which the iron core covering member concerning Embodiment 1 of this invention was inserted in the coil | winding, and winding The figure for demonstrating the manufacturing method of the stationary inductor concerning Embodiment 1 of this invention. The perspective view for demonstrating the core cover member concerning Embodiment 2 of this invention. The perspective view for demonstrating the modification of the iron core cover member concerning Embodiment 2 of this invention.

  Hereinafter, a stationary inductor according to an embodiment of the present invention and a method for manufacturing the stationary inductor will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
First, the stationary inductor according to the first embodiment of the present invention will be described. FIG. 1 is a perspective view of a stationary inductor to which an iron core covering member according to a first embodiment of the present invention is applied. FIG. 2 is a front view of the iron core included in the stationary inductor according to the first embodiment of the present invention.

  In the first embodiment, stationary inductor 100 is a transformer. More specifically, the static inductor 100 is an amorphous transformer. An amorphous transformer is a transformer whose iron core is an amorphous alloy.

  Static inductor 100 includes an iron core 1 and a winding 2. In Embodiment 1, the iron core 1 is a wound iron core. The iron core 1 is configured by stacking a plurality of thin amorphous alloys into a strip shape and wound up. As shown in FIG. 2, the iron core 1 includes an outer core 10A and inner cores 10B and 10C. The iron core 1 has yokes 11 and 12 and a plurality of legs 13. The yoke 11 corresponds to the first yoke. The yoke 12 corresponds to the second yoke. In the first embodiment, the iron core 1 has three legs 13, but the number of legs 13 is not limited to three. The iron core 1 may have at least two legs 13. The plurality of legs 13 are arranged in a line and are arranged between the yoke 11 and the yoke 12. The plurality of legs 13 are connected to the yoke 11 and the yoke 12, respectively. Each leg 13, the yoke 11, and the yoke 12 need only have at least a magnetic circuit formed thereon.

  In the static inductor 100, the winding 2 is attached to the leg 13 of the iron core 1. Winding 2 is wound around leg 13 of iron core 1. The stationary inductor 100 has a plurality of windings 2. In the first embodiment, in the static inductor 100 using the iron core 1 having the three legs 13, the number of windings 2 is also three. The number of windings 2 varies depending on the number of legs 13 included in the iron core 1.

  Before the core 1 is inserted into the winding 2, the ends A1, A2 and A3 are open. When the ends A1, A2 and A3 of the iron core 1 are open, the iron core 1 has an m-shape when viewed from the front. That is, when the end portions A1, A2, and A3 are open, the three legs 13 are extended downward in the drawing. Here, since the two extended legs 13 on both sides include a portion of the outer core 10 </ b> A that forms the yoke 12, the two extended legs 13 on both sides of the center extended leg 13. Is longer. By opening the end portions A1, A2 and A3, the respective legs 13 can be inserted into the winding 2 and the iron core covering members 3 and 4 described later. After each leg 13 is inserted through the winding 2, the end portions A1, A2 and A3 are closed to form the yoke 12. In this way, the iron core 1, the winding 2, and the iron core covering members 3 and 4 are combined.

  Winding 2 is a conductor, and copper wire is used in the first embodiment. The winding 2 is not limited to a copper wire as long as it is a conductor, and may be an aluminum wire or an aluminum alloy wire. The winding 2 is not limited to an aluminum wire or an aluminum alloy wire.

  When the iron core 1 is an amorphous alloy, since the amorphous alloy is fragile, the iron core 1 is easily broken. The broken pieces of the iron core 1 may be scattered around the stationary inductor 100. When the fragments of the iron core 1 are scattered around the stationary inductor 100, the insulation performance of the stationary inductor 100 may deteriorate. For this reason, in order to prevent the fragments of the iron core 1 from being scattered around the stationary inductor 100, it is necessary to take measures such as covering the entire iron core 1. In the first embodiment, the entire iron core 1 is covered with a pair of iron core covering members 3 and 4 described later.

  FIG. 3 is a perspective view for explaining the iron core covering member according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view of the core cover member and the winding in a state where the core cover member according to the first exemplary embodiment of the present invention is inserted into the winding. FIG. 5 is a diagram for explaining the method for manufacturing the stationary inductor according to the first embodiment of the present invention. The iron core covering member 3 and the iron core covering member 4 are a pair of members, and the iron core covering member 3 and the iron core covering member 4 have the same configuration. The description of the iron core covering member 4 will be made only for parts different from the structure of the iron core covering member 3. The iron core covering member 3 corresponds to the first iron core covering member. The iron core covering member 4 corresponds to a second iron core covering member.

  In Embodiment 1, the iron core covering member 3 is a member having a plurality of cylindrical portions as shown in FIG. Specifically, the iron core covering member 3 has a plurality of cylindrical portions 31 and overhang portions 32. The plurality of cylinder portions 31 and the overhang portions 32 are formed integrally. The cylinder portion 31 corresponds to a first cylindrical member. The overhang portion 32 corresponds to the first overhang portion. In the first embodiment, the iron core covering member 3 has three cylindrical portions 31, but it is only necessary to have the same number of cylindrical portions 31 as the number of windings 2. The iron core covering member 3 only needs to have at least two cylindrical portions 31.

  The iron core covering member 3 has a protruding portion 32 at one end portion 31T of each of the three cylindrical portions 31. The overhang portion 32 is a portion that protrudes from one end portion 31 </ b> T of each of the three cylinder portions 31 outward from the respective open portions of the three cylinder portions 31. The overhang 32 extends over the entire circumference of one end 31T of each of the three cylinders 31.

  The cylinder part 31 has four rectangular side plates 31S. Adjacent side plates 31S are vertically combined with the four side plates 31S. The cylindrical portion 31 has a quadrangular prism shape, and a space 31I surrounded by the four side plates 31S is formed by the four side plates 31S. The space 31I opens to both end portions 31T and 31U of the cylindrical portion 31. The shape of the portion where the space 31I opens is a rectangle. Of the four side plates 31S, the angle at which the adjacent side plates 31S are combined is not limited to 90 degrees. That is, the shape of the portion where the space 31I is opened may not be a rectangle.

  The cylinder part 41 has four rectangular side plates 41 </ b> S, similarly to the cylinder part 31. The cylinder part 41 is inserted into the space 31 </ b> I of the cylinder part 31. The cylinder portion 41 corresponds to a second cylindrical member.

  The cylinder part 31 is a cylindrical member. As shown in FIGS. 3 and 4, the cylindrical portion 31 is inserted into the insertion hole 2 </ b> I of the winding 2 wound in advance in a cylindrical shape. Thereafter, as shown in FIGS. 3 and 4, the cylindrical portion 41 of the iron core covering member 4 is inserted into the cylindrical portion 31. Thereafter, the legs 13 of the iron core 1 are inserted into the cylindrical portion 41. Specifically, each leg 13 of the iron core 1 is inserted into each space 41I of the three cylindrical portions 41 and disposed in the space 41I.

  As illustrated in FIGS. 3 and 4, the overhang portion 32 is a member having three openings 32 </ b> E. The outer shape of the overhang portion 32 is a rectangle. In the first embodiment, the shape of the opening 32E is a rectangle, which is the same shape as the portion where the space 31I opens.

  In the first embodiment, the iron core covering member 3 is an insulating member. More specifically, the iron core covering member 3 is an insulating sheet. In the first embodiment, as shown in FIG. 5, the yoke 11 of the iron core 1 is entirely covered by the bent overhanging portion 32. The overhang portion 32 is bent to cover the yoke 11 of the iron core 1, thereby forming the bent portion 33. The bent portion 33 corresponds to the first bent portion. The yoke 12 of the iron core 1 is entirely covered by the bent overhanging portion 42. The overhang portion 42 corresponds to the second overhang portion. The overhang portion 42 is bent to cover the yoke 12 of the iron core 1, thereby forming a bent portion 43. The bent portion 43 corresponds to the second bent portion. The three legs 13 of the iron core 1 are entirely covered by the three cylindrical portions 41. As a result, the entire iron core 1 is covered by the pair of iron core covering members 3 and 4.

  A method for manufacturing the stationary inductor 100 will be described. First, as described above, a plurality of thin amorphous alloys cut into strips are stacked to form an iron core 1 having open ends A1, A2, and A3, that is, an iron core 1 having an m-shape in front view. Next, an iron core covering member 3 having a plurality of tube portions 31 and a single overhang portion 32 formed integrally with the plurality of tube portions 31 is formed, and a plurality of tube portions 41 and a plurality of tube portions are formed. The iron core covering member 4 having one overhanging portion 42 formed integrally with 41 is formed. Next, the cylindrical portions 31 and 41 of the pair of iron core covering members 3 and 4 are inserted into the insertion holes 2I of the winding 2 wound in a cylindrical shape in advance. Next, the leg 13 of the iron core 1 with the end portions A1, A2, A3 opened is inserted into the tube portion 41. Next, the yoke 12 is formed by bending the extended portion of the extended leg 13 of the iron core 1 with the ends A1, A2, A3 open, and joining the ends A1, A2, A3. Next, the yoke 11 of the iron core 1 is covered by bending the overhang portion 32, and the yoke 12 of the iron core 1 is covered by bending the overhang portion 42.

  Before the core 1 is inserted into the winding 2, the portions other than the ends A1, A2 and A3 in the core 1 are covered, and after the core 1 is inserted into the winding 2, the ends A1, A2 and A2 in the core 1 are covered. In the method of covering the entire iron core 1 by covering A3, the number of steps for covering the entire iron core 1 is increased, and the operation of inserting the iron core 1 into the winding 2 is difficult. According to the present embodiment, the pair of iron core covering members 3 and 4 are inserted into the winding 2, and the yokes 11 and 12 of the iron core 1 inserted through the three cylindrical portions 41 are respectively provided by the overhang portions 32 and 42. Since the entire iron core 1 can be covered only by covering it, the number of steps for covering the entire iron core 1 can be reduced. Further, when the legs 13 of the iron core 1 are inserted into the three cylindrical portions 41, the iron core 1 is not covered with the iron core covering members 3, 4, so that the legs 13 of the iron core 1 are inserted into the three cylindrical portions 41. The work to be done can be made easy. Thereby, the iron core 1 whole can be covered easily and accurately.

  When the three cylindrical portions 31 have independent protruding portions, and the three cylindrical portions 41 have independent protruding portions, the three cylindrical portions 31 are covered when the yoke 11 of the iron core 1 is covered. The operation | work which sticks each overhang | projection part is needed, and when the yoke 12 of the iron core 1 is covered, the operation | work which sticks the overhang | projection parts which the three cylinder parts 41 each have is needed. According to the present embodiment, the three cylindrical portions 31 do not have independent protruding portions, and the three cylindrical portions 41 do not have independent protruding portions. The operation | work which sticks the overhang | projection parts when covering the yokes 11 and 12 of this can be made unnecessary. Thereby, the man-hour for covering the iron core 1 whole further can be decreased.

Embodiment 2. FIG.
Next, a stationary inductor according to the second embodiment of the present invention will be described. FIG. 6 is a perspective view for explaining an iron core covering member according to the second embodiment of the present invention. The stationary inductor according to the second embodiment of the present invention has the above-described first embodiment in that each winding 2 has a pair of iron core covering members 5 and 6 and the configuration of the cylindrical portions 51 and 61 is different. And mainly different. The description of the same configuration and operation as those in the first embodiment is omitted, and a description of the different configuration and operation is given below. Moreover, the iron core covering member 5 and the iron core covering member 6 are a pair of members, and the iron core covering member 5 and the iron core covering member 6 have the same configuration. The description of the iron core covering member 6 will be made only for parts different from the structure of the iron core covering member 5.

  In the second embodiment, the iron core covering member 5 is a member having a cylindrical portion as shown in FIG. Specifically, the iron core covering member 5 includes a tube portion 51 and an overhang portion 52.

  The iron core covering member 5 has a protruding portion 52 at one end 51T of the cylindrical portion 51. The projecting portion 52 is a portion projecting from one end portion 51 </ b> T of the tubular portion 51 toward the outside from the opening portion of the tubular portion 51. The overhanging portion 52 overhangs the entire circumference of one end portion 51 </ b> T of the cylindrical portion 51.

  The cylinder portion 51 includes three rectangular side plates 51S and one rectangular side plate 51Sa having a cut 51B. The cut 51B corresponds to the first cut. In the side plate 51Sa, a cut 51B is formed from the end 51U of the cylindrical portion 51 toward the end 51T. In FIG. 6, the cut line 51B is formed in a straight line, but the cut line 51B does not need to be formed in a straight line. For example, the cut 51B may be formed in a curved shape. The four side plates 51S, 51Sa are vertically combined with the adjacent side plates 51S, 51Sa. The cylindrical portion 51 has an outer shape of a quadrangular prism, and a space 51I surrounded by the four side plates 51S and 51Sa is formed by the four side plates 51S and 51Sa. The space 51I is open to both end portions 51T and 51U of the cylindrical portion 51. The shape of the portion where the space 51I opens is a rectangle. The angle at which the adjacent side plates 51S and 51Sa among the four side plates 51S and 51Sa are combined is not limited to 90 degrees. That is, the shape of the portion where the space 51I is opened may not be a rectangle.

  Similar to the cylinder portion 51, the cylinder portion 61 includes three rectangular side plates 61S and one rectangular side plate 61Sa having a cut 61B. The cut 61B corresponds to the second cut. The cylinder part 51 and the cylinder part 61 have cut lines 51B and 61B at different positions. For example, the cylinder part 51 has a side plate 51Sa on the lower side in FIG. 6, and the cylinder part 61 has a side plate 61Sa on the upper side in FIG.

  The cylinder part 51 is a cylindrical member. The cylindrical part 51 is inserted into the insertion hole 2I of the winding 2 as shown in FIG. Thereafter, as shown in FIG. 6, the cylindrical portion 61 of the iron core covering member 6 is inserted into the cylindrical portion 51. The cylindrical portion 51 and the cylindrical portion 61 overlap each other at one end side in the insertion hole 2I. Thereafter, the leg 13 of the iron core 1 is inserted into the cylindrical portion 61.

  In the method for manufacturing a stationary inductor according to the present embodiment, an iron core covering member 5 having a cylinder portion 51 and an overhang portion 52 is formed, and an iron core covering member 6 having a cylinder portion 61 and an overhang portion 62 is formed. Forming a cut 51B in the cylindrical portion 51, forming a cut 61B in the cylindrical portion 61, and windings in which the cylindrical portions 51 and 61 of the pair of core cover members 5 and 6 are previously wound into a cylindrical shape. 2, the step of inserting the leg 13 of the iron core 1 with the ends A 1, A 2, A 3 open, the yoke 11 of the iron core 1, and the overhanging portion 52. Folding and covering the yoke 12 of the iron core 1 and bending the overhanging portion 62.

  According to the present embodiment, by closing the cuts 51 </ b> B and 61 </ b> B formed in the cylindrical portions 51 and 61, the cylindrical portion 51 can be easily inserted into the winding 2, and the cylindrical portion 61 is connected to the cylindrical portion 51. It can be made easy to insert. Furthermore, by opening the cuts 51B and 61B formed in the cylindrical portions 51 and 61, the contact area between the winding 2 and the cylindrical portion 51 can be increased, and the contact area between the cylindrical portion 61 and the cylindrical portion 51 can be increased. Can be bigger. Thereby, the whole iron core 1 can be covered accurately.

  According to this Embodiment, since the cylinder part 51 and the cylinder part 61 have the cut | interruptions 51B and 61B in a different position, it can cover the leg 13 whole of the iron core 1 without gap. In the cylindrical part 51 and the cylindrical part 61, the part with the cuts 51B and 61B and the part without the cuts 51B and 61B overlap, so that the leg 13 of the iron core 1 is not exposed from the part with the cuts 51B and 61B.

  FIG. 7: is a perspective view for demonstrating the modification of the iron core cover member concerning Embodiment 2 of this invention. In the present embodiment, one cut line 51B, 61B is formed in each of the cylinder parts 51, 61. However, as shown in FIG. 7, two cut lines 51B, 61B are formed in each of the cylinder parts 51, 61. May be. In this case, by closing the two cuts 51 </ b> B and 61 </ b> B formed in the cylindrical portions 51 and 61, the cylindrical portion 51 can be further easily inserted into the winding 2, and the cylindrical portion 61 is further inserted into the cylindrical portion 51. It can be made easy. Furthermore, by opening the two cuts 51B and 61B formed in the cylindrical portions 51 and 61, the contact area between the winding 2 and the cylindrical portion 51 can be further increased. The contact area can be further increased. Three or more cut lines 51B and 61B may be formed in the tube portions 51 and 61, respectively.

  The cut lines 51B and 61B shown in the second embodiment may be formed in the cylindrical portions 31 and 41 of the pair of iron core covering members 3 and 4 shown in the first embodiment. In this case, the entire iron core 1 can be covered easily and accurately.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit and change the part.

  1 Iron core, 2 windings, 2I insertion hole, 3, 4, 5, 6 Iron core covering member, 10A outer core, 10B, 10C inner core, 11, 12 yoke, 13 legs, 31, 41, 51, 61 cylinder part, 31S, 41S, 51S, 51Sa, 61S, 61Sa Side plate, 32, 42, 52, 62 Overhang, 32E, 42E Opening, 33, 43 Bending, 51B, 61B Cut, 51T, 51U End, 100 Stationary guidance vessel.

Claims (5)

An iron core having a first yoke, a second yoke, and legs;
A winding formed around the leg and having an insertion hole into which the leg is inserted;
A first tubular member that is inserted into the insertion hole from one end side from one end side of the insertion hole and has a first cut formed from one end side toward the other end side. And a first iron core covering member provided at the other end of the first cylindrical member and having a first bent portion that covers the first yoke,
A second cylindrical member that is inserted into the insertion hole from one end side from the other end side of the insertion hole and overlaps the first cylindrical member and the one end side in the insertion hole. And a second iron core covering member provided at the other end of the second cylindrical member and having a second bent portion that covers the second yoke,
The second cylindrical member is located at a position different from the first cut at a portion overlapping the first cylindrical member from the one end side of the second cylindrical member. A stationary inductor having a second cut formed toward the other end of the cylindrical member. An iron core having a first yoke, a second yoke, and a plurality of legs arranged side by side and respectively connected to the first yoke and the second yoke;
A plurality of windings each having an insertion hole into which the legs are inserted;
A plurality of first cylindrical members inserted from one end side into the insertion hole from one end side of each insertion hole of the plurality of windings; and a plurality of the first cylindrical members; A first iron core covering member formed on the other end side of the first cylindrical member and having a first bent portion that covers the first yoke;
A plurality of second cylindrical members respectively inserted into the insertion hole from one end side from the other end side of each insertion hole of the plurality of windings; and a plurality of the second cylindrical members And a second iron core covering member formed on the other end side of the plurality of second cylindrical members and having a second bent portion covering the second yoke. Characteristic stationary inductor. Each of the plurality of first cylindrical members has a first cut formed from one end side toward the other end side,
Each of the plurality of second cylindrical members has a second cut formed from one end side toward the other end side,
The said 1st cut and the said 2nd cut are formed in a different position in the part which the said 1st cylindrical member and the said 2nd cylindrical member overlap. The static inductor as described in. A first iron core covering member having a first cylindrical member and a first overhang portion is formed, and a second iron core having a second cylindrical member and a second overhang portion. Forming a covering member;
A first cut is formed in the first cylindrical member from one end side toward the other end side, and the second cylindrical member is provided with one end side from the other end side. A second cut at a position different from the first cut toward
The first cylindrical member is inserted from one end side into the insertion hole from one end side of the insertion hole of the winding, and one end is inserted into the insertion hole from the other end side of the insertion hole of the winding. Inserting the second cylindrical member from the part side;
Inserting a leg of an iron core into the second cylindrical member;
And a step of bending and covering the first yoke of the iron core by bending the first overhanging portion and bending and covering the second yoke of the iron core by bending the second overhanging portion. A method for manufacturing a stationary inductor. A plurality of first cylindrical members, and a first overhang portion formed integrally with the plurality of first cylindrical members and on the other end side of the plurality of first cylindrical members. A first iron core covering member having a plurality of second cylindrical members, and the other of the plurality of second cylindrical members integrated with the plurality of second cylindrical members. Forming a second iron core covering member having a second projecting portion formed on the end side;
The plurality of first cylindrical members are respectively inserted into the insertion holes from one end side of the insertion holes of the plurality of windings, and the insertion is performed from the other end side of the insertion holes of the plurality of windings. Inserting each of the plurality of second cylindrical members into the holes;
Inserting a plurality of legs of the iron core into the plurality of second cylindrical members,
And a step of bending and covering the first yoke of the iron core by bending the first overhanging portion and bending and covering the second yoke of the iron core by bending the second overhanging portion. A method for manufacturing a stationary inductor.