The present invention relates to an automatic winding machine for manufacturing an air core coil insertable to a core installed in a rectifying circuit, a noise prevention circuit, a resonance circuit, and the like in various AC devices. The present invention also relates to an air core coil including a plurality of coil layers, and a winding method of the same.
A coil device installed in the rectifying circuit, the noise prevention circuit, the resonance circuit, and the like of the AC devices is formed by winding a coil around a core.
The applicant proposed a method of manufacturing a coil device by inserting an air core coil preliminarily wound in a spiral form to a core in which a gap is opened in the tangential direction from the gap (for example, refer to Patent Document 1: Japanese Patent Laid-open Publication No. 2000-277337).
An automatic winding machine of Patent Document 1 described above includes a pair of winding core members having a substantially rectangular section and being integrally rotated by a rotation drive mechanism, and manufactures an air core coil in which an inner circumferential length on the inner circumferential side of the core and an outer circumferential length on the outer circumferential side of the core are different by rotating while changing an interval between the winding core members and directly winding a conductive wire around the winding members.
As a method of manufacturing an air core coil in which an inner circumferential length and an outer circumferential length are different, a method of using a stepped winding jig corresponding to a hollow shape of the air core coil (Patent Document 2: Japanese Patent Laid-open Publication No. 2003-86438) and an automatic winding machine for winging a conductive wire around a winding core member while changing a form of the winding core member for each wire winding step of a unit wound portion (Patent Document 3: Japanese Patent Laid-open Publication No. 2006-339407) are known.
When the air core coil manufactured by an automatic winding machine of Patent Document 2 or 3 described above is installed to a core, a part of the conductive wire on the inner circumferential side of the core is overlapped in the radial direction, so that the conductive wire can be closely wound.
As shown in
As a winding method of such an air core coil 200, a method of forming a first unit wound portion 25, a second unit wound portion 26, and a third unit wound portion 27 having different inner circumferential lengths from each other continuously in the winding shaft direction by winding a conductive wire in a swirl form as shown in
An automatic winding machine configured to manufacture an air core coil in which unit coil portions formed by winding at least one conductive wire in a swirl form are repeatedly placed side by side in a winding shaft direction, each of the unit coil portions is formed by a plurality of unit wound portions having different inner circumferential lengths from each other, and when inserted to a core having a gap, at least a part of the unit wound portion having a small inner circumferential length is pushed inside the unit wound portion having a large inner circumferential length, the automatic winding machine comprising: a rotation drive mechanism; four winding core shafts protruding from the rotation drive mechanism and being rotated integrally with a rotation center of the rotation drive mechanism, the winding core shafts whose axial centers are parallel to the rotation center; a reciprocating mechanism for sliding and moving the winding core shafts between a first position where the axial centers of the winding core shafts serve as apex positions of a substantial rectangle surrounding the rotation center and two facing sides connecting the winding core shafts are an inner circumferential length and an outer circumferential length, and a second position where the axial centers of the winding core shafts serve as apex positions of a substantial trapezoid whose outer circumferential length is the same as the first position and whose inner circumferential length is long, so as to bring the winding core shafts close to or away from the rotation center of the rotation drive mechanism; at least one pressing roller biased in the direction of bringing close to a rotation passage of the winding core shafts from the outer circumferential side; and a conductive wire supply mechanism for continuously supplying the conductive wire between the winding core shafts and the pressing roller.
A winding method of an air core coil in which unit coil portions formed by winding at least one conductive wire in a swirl form are repeatedly placed side by side in the winding shaft direction, each of the unit coil portions is formed by a plurality of unit wound portions having different inner circumferential lengths from each other, at least a part of the unit wound portion having a small inner circumferential length is pushed inside the unit wound portion having a large inner circumferential length, and each of the plurality of unit wound portions forming the unit coil portion is formed in a polygonal shape having a plurality of corner parts, wherein a plurality of winding core mechanisms matching with the number of the polygonal corner parts is arranged around a rotation shaft serving as the winding shaft so as to be driven and rotated about the rotation shaft, a plurality of winding core pieces reciprocatable in the direction of crossing the winding shaft is installed in each of the winding core mechanisms, the winding method has a first step of setting the pluralities of winding core pieces of the winding core mechanisms at predetermined positions; and a second step of winding the conductive wire around the pluralities of winding core pieces forming the winding core mechanisms by rotating the plurality of winding core mechanisms in a state that the pluralities of winding core pieces are set at the predetermined positions, and the plurality of unit wound portions forming one of the unit coil portions is formed by repeating the first step and the second step while changing the positions of the pluralities of winding core pieces in the direction of bringing away from the rotation shaft or in the opposite direction thereof in a plane orthogonal to the rotation shaft.
The methods, systems, and apparatuses are set forth in part in the description which follows, and in part will be obvious from the description, or can be learned by practice of the methods, apparatuses, and systems. The advantages of the methods, apparatuses, and systems will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the methods, apparatuses, and systems, as claimed.
In the accompanying figures, like elements are identified by like reference numerals among the several preferred embodiments of the present invention.
a) to (f) are a series of front views showing a wire winding step of using the automatic winding machine.
a) to (c) are sectional views respectively along lines a-a, b-b, c-c of
a) to (b) are front views showing a structure of major parts of an automatic winding machine for manufacturing the air core coil according to the second embodiment of the present invention, and actions of a plurality of winding core pieces.
a) to (b) are views showing a compressing step of the air core coil.
The foregoing and other features and advantages of the invention are apparent from the following detailed description of exemplary embodiments, read in conjunction with the accompanying drawings. The detailed description and drawings are merely illustrative of the invention rather than limiting, the scope of the invention being defined by the appended claims and equivalents thereof.
A starting end of a conductive wire forming an air core coil is attached on a rotation drive mechanism side of a winding core member, and the wire is successively wound in the direction of bringing away from the rotation drive mechanism. Therefore, after the air core coil is manufactured, tasks of detaching the air core coil from the wire winding member and installing the starting end of the conductive wire to the winding core member are required again. Since these tasks are required every time when a predetermined length of air core coil is manufactured and there is a need for once stopping the automatic winding machine, an automatic winding machine capable of improving working efficiency is demanded.
In the air core coil manufactured by the automatic winding machine, not only the inner circumferential length is different but also the outer circumferential length is changed in accordance with the inner circumferential length. Therefore, when wound around the core, a part of the conductive wire on the coil outer circumferential side, the part having a long outer circumferential length is not closely attached to the coil, and there is a possibility that slack is generated.
A first object of the present invention is to provide an automatic winding machine capable of manufacturing an air core coil having unit wound portions which have different inner circumferential lengths but the same outer circumferential lengths.
In the conventional winding method of the air core coil including the plurality of coil layers, by repeating a step of utilizing a corner part 30a of a winding core piece 30 and bending and deforming a conductive wire by about 90 degrees as shown in
Accordingly, there is a problem that a space factor of the conductive wire in the air core coil is lowered.
In order to solve this problem, as shown in
Accordingly, the bent parts of the unit wound portions on the inner circumferential side and the outer circumferential side are closely connected to each other, so that the space factor of the conductive wire is increased.
However, in order to change an arc shape of the corner part for each unit wound portion, in the wire winding step of using the winding core piece 30 shown in
Thus, a second object of the present invention is to provide an air core coil capable of increasing a space factor of a conductive wire more than in the conventional example and a winding method capable of easily manufacturing such an air core coil.
In order to achieve the first object, an automatic winding machine of the present invention is an automatic winding machine for manufacturing an air core coil in which unit coil portions formed by winding at least one conductive wire in a swirl form are repeatedly placed side by side in the winding shaft direction, each of the unit coil portions is formed by a plurality of unit wound portions having different inner circumferential lengths from each other, and when inserted to a core having a gap, at least a part of the unit wound portion having a small inner circumferential length is pushed inside the unit wound portion having a large inner circumferential length, the automatic winding machine having a rotation drive mechanism, four winding core shafts protruding from the rotation drive mechanism and being rotated integrally with a rotation center of the rotation drive mechanism, the winding core shafts whose axial centers are parallel to the rotation center, a reciprocating mechanism for sliding and moving the winding core shafts between a first position where the axial centers of the winding core shafts serve as apex positions of a substantial rectangle surrounding the rotation center and two facing sides connecting the winding core shafts are an inner circumferential length and an outer circumferential length, and a second position where the axial centers of the winding core shafts serve as apex positions of a substantial trapezoid whose outer circumferential length is the same as the first position and whose inner circumferential length is long, so as to bring the winding core shafts close to or away from the rotation center of the rotation drive mechanism; at least one pressing roller biased in the direction of bringing close to a rotation passage of the winding core shafts from the outer circumferential side, and a conductive wire supply mechanism for continuously supplying the conductive wire between the winding core shafts and the pressing roller.
As specific mode, a pusher member arranged closely to the near side of the rotation direction of a position where the conductive wire supplied from the conductive wire supply mechanism is firstly abutted with any of the winding core shafts, the pusher member for pushing out the conductive wire wound around the winding core shafts to the free end side of the winding core shafts is desirably provided.
Further, in order to achieve the second object, in an air core coil of the present invention, unit coil portions formed by winding at least one conductive wire in a swirl form are repeatedly placed side by side in the winding shaft direction, each of the unit coil portions is formed by a plurality of unit wound portions having different inner circumferential lengths from each other, and at least a part of the unit wound portion having a small inner circumferential length is pushed inside the unit wound portion having a large inner circumferential length.
Each of the plurality of unit wound portions forming the unit coil portion is formed in a polygonal shape having a plurality of corner parts, each of all the corner parts of the unit wound portion is formed by a plurality of bent parts formed by bending the conductive wire at obtuse angle, and one or a plurality of connection parts for connecting the adjacent bent parts.
In the corner parts of the plurality of the unit wound portions forming the unit coil, the plurality of bent parts overlapping with each other at the same phase position is placed side by side on one straight line extending from the inner side to the outer side of the unit coil portion.
It should be noted that in the present invention, the air core coil has a concept including not only a coil in which a core does not exist in a space of a coil center part of a final product but also a coil in which a core exists in a space of a coil center part of a final product (coil device).
Specifically, in each of the corner parts, one straight line on which the plurality of bent parts formed in the plurality of unit wound portions, the bent parts overlapping at a first phase position are placed side by side, and one straight line on which the plurality of bent parts formed in the plurality of unit wound portions, the bent parts overlapping at a second phase position are placed side by side cross each other at one point on the inner side of the unit coil portion.
A winding method of an air core coil of the present invention is a winding method of the air core coil of the present invention in which a plurality of winding core mechanisms matching with the number of the polygonal corner parts is arranged around a rotation shaft serving as the winding shaft so as to be driven and rotated about the rotation shaft, a plurality of winding core pieces reciprocatable in the direction of crossing the winding shaft is installed in each of the winding core mechanisms, and the plurality of unit wound portions forming one of the unit coil portions is formed by repeating a first step of setting the pluralities of winding core pieces of the winding core mechanisms at predetermined positions and a second step of winding the conductive wire around the pluralities of winding core pieces forming the winding core mechanisms by rotating the plurality of winding core mechanisms in a state that the pluralities of winding core pieces are set at the predetermined positions, while changing the positions of the pluralities of winding core pieces in the direction of bringing away from the rotation shaft or in the opposite direction thereof in a plane orthogonal to the rotation shaft.
Specifically, upon forming continuous first and second unit wound portions, after forming the first unit wound portion, while pushing out the unit wound portion from outer circumferential surfaces of the pluralities of winding core pieces by the conductive wire to be the second unit wound portion, the conductive wire to be the second unit wound portion is wound on the outer circumferential surfaces of the pluralities of winding core pieces, and the second unit wound portion is formed.
Further specifically, after the plurality of unit coil portions is formed by repeating the first step and the second step, by compressing the unit coil portions in the winding shaft direction, at least a part of the unit wound portion having a small inner circumferential length is pushed inside the unit wound portion having a large inner circumferential length, and the air core coil including a plurality of coil layers is completed.
According to the automatic winding machine of the present invention, by integrally rotating the winding core shafts while reciprocating, a coil portion having the unit coil portions which include the unit wound portions having different inner circumferential lengths can be continuously manufactured.
In the coil portion manufactured by the automatic winding machine of the present invention, the substantially trapezoid unit wound portions having the changed inner circumferential lengths while having the same outer circumferential lengths as the substantially rectangular unit wound portions can be formed. Thus, when the obtained coil portion is inserted to the core having the gap, not only a part of the conductive wire can be overlapped on an inner circumferential surface of the core but also the conductive wire can be wound around an outer circumference of the core more closely than in the conventional example due to the same outer circumferential lengths.
The manufactured unit wound portions are successively pushed out to the free end side of the winding core shafts by the pusher member. Thus, unlike the conventional example, a task of attaching the conductive wire again to the automatic winding machine after the automatic winding machine is stopped and the coil portion is detached can be omitted.
Further, in the air core coil of the present invention, in an ideal structure that the pluralities of bent parts of the plurality of unit wound portions are formed in an arc shape, the corner part corresponds to a shape formed by approximating the arc shape by the polygonal shape (polygonal lines). Thus, the gaps between the bent parts in the corner part become smaller than in the conventional example, and the space factor of the conductive wire is increased.
The winding core shafts 31, 32, 33, 34 are arranged so as to be rotated integrally with the center foundation shaft 20 and installed in slide blocks 41, 42, 43, 44 sliding so as to be brought close to and away from the center foundation shaft 20. More specifically, the winding core shafts 31, 32, 33, 34 are attached to corners of the slide blocks 41, 42, 43, 44 on the center foundation shaft 20 side, and leading ends thereof project from the slide blocks 41, 42, 43, 44. The winding core shafts 31, 32, 33, 34 can be square columns whose parts on the center foundation shaft 20 side are cut out. As described later, by making the slide blocks 41, 42, 43, 44 slide in parallel to the center foundation shaft 20, the winding core shafts 31, 32, 33, 34 can be brought close to and away from each other.
The leading ends of the winding core shafts 31, 32, 33, 34 protrude from leading end surfaces 45 of the slide blocks 41, 42, 43, 44 so as to be slightly longer than a diameter of a conductive wire 70. A protruding length of the winding core shafts 31, 32, 33, 34 is favorably 1 to 3 mm longer than the diameter of the conductive wire 70, and specifically, the protruding length is desirably about 2 to 5 mm.
One or a plurality of pressing rollers 51, 52, 53 is arranged on an outer circumference of a rotation passage of the winding core shafts 31, 32, 33, 34. In the present embodiment, as shown in
More specifically, as shown in
The pressing trunk portion 55 and the pressing plate 56 can be integrally formed. In the pressing trunk portion 55 and the pressing plate 56, a shaft hole 57 is opened through the center, and the bias means for biasing in the direction of bringing close to the rotation passage is connected to the shaft hole 57.
Between the upper pressing roller 51 and the rotation passage of the winding core shaft 32, the conductive wire 70 forming an air core coil is supplied from the upstream side of the rotation direction of the winding core shaft 31. The conductive wire 70 can be supplied by a conductive wire supply mechanism (not shown). As the conductive wire supply mechanism, a configuration that the conductive wire 70 is successively supplied from a tubular guide 76 whose leading end is opened between the upper pressing roller 51 and the rotation passage of the winding core shafts 31, 32, 33, 34 via a plurality of guide rollers (not shown) can be shown as an example.
On the lower side of an opening of the guide 76, that is, on the upstream side of the rotation direction, a pusher member 77 for pushing out the conductive wire 70 wound around the winding core shafts 31, 32, 33, 34 to the free end side of the winding core shafts 31, 32, 33, 34 is provided. The pusher member 77 is placed in the non-rotation casing (not shown) of the automatic winding machine 10 and arranged closely to the rotation passage of the winding core shafts 31, 32, 33, 34. It should be noted that as well as the pressing rollers 51, 52, 53, the pusher member is desirably biased in the direction of bringing close to the rotation passage of the winding core shafts 31, 32, 33, 34 by bias means or the like.
Further, as shown in
The automatic winding machine 10 with the above configuration has a reciprocating mechanism formed by a cam mechanism or the like, so that the rotated slide blocks 41, 42, 43, 44 can slide in the directions of bringing close or away in a plane orthogonal to axial centers of the winding core shafts 31, 32, 33, 34. More specifically, by the reciprocating mechanism, the slide blocks 41, 42, 43, 44 can slide while being integrally rotated about the center foundation shaft 20 between a state that the winding core shafts 31, 32, 33, 34 are positioned at apexes of an oblong as shown in
Hereinafter, a winding process of the conductive wire 70 of the automatic winding machine 10 of the present invention will be described. Firstly, in a state that the winding core shafts 31, 32, 33, 34 are positioned at apexes of an oblong as shown in
At this time, as shown in
From this state, by actuating the rotation drive mechanism and actuating the reciprocating mechanism, winding of the conductive wire 70 is started.
When the winding core shafts 31, 32, 33, 34 are rotated as shown in
When the winding core shafts 31, 32, 33, 34 are rotated by about 270 from start of winding of the conductive wire 70, as shown in
By rotating the winding core shafts 31, 32, 33, 34 by the predetermined number of times, for example twice, the conductive wire 70 becomes unit wound portions 80, 81 of double substantial oblongs. Next, by actuating the reciprocating mechanism while actuating the rotation drive mechanism, as shown in
After the above process, by rotating the rotation drive mechanism, as shown in
By rotating the winding core shafts 31, 32, 33, 34 in this state, a unit wound portion 82 having inner and outer circumferential lengths which are slightly longer than the oblong is formed.
Further, by successively moving the winding core shafts 31, 32, 33, 34 in the direction of bringing away from the center foundation shaft 20 further from the interim position while rotating the winding core shafts 31, 32, 33, 34, and rotating the winding core shafts 31, 32, 33, 34 while moving the winding core shafts 31, 32, 33, 34 to positions serving as apexes of a substantial trapezoid, the conductive wire 70 forms unit wound portions 83, 84 of a substantial trapezoid having outer and inner circumferential lengths which are longer than in the interim position as shown in
Next, by rotating while successively returning the winding core shafts 31, 32, 33, 34 to the above interim position, further returning the winding core shafts 31, 32, 33, 34 to the positions where the winding core shafts 31, 32, 33, 34 become apexes of a substantial oblong as described above, and repeating an action of rotating by the predetermined number of times, a unit coil portion 79 in which the unit wound portions 80, 81, 82, 83, 84 as shown in
When the air core coil having a predetermined length is formed, the automatic winding machine 10 is once stopped and the conductive wire 70 is cut off on the winding assisting member 21, so that the air core coil can be obtained. By actuating the automatic winding machine 10 again, manufacture of the air core coil is continued.
The manufactured air core coil is inserted to the core 87 in which a gap 86 is opened in the connection direction as shown in
Since the air core coil is formed by the unit wound portions 80, 82, 83 having different inner circumferential lengths, as shown in
Next, an automatic winding machine 1 of a second embodiment of the present invention will be specifically described along the drawings.
As shown in
In each of the corner parts 23a of the air core coil 2, the first unit wound portion 25 has two bent parts 25a, 25a, the second unit wound portion 26 has two bent parts 26a, 26a, and the third unit wound portion 27 has two bent parts 27a, 27a. A bent angle of the bent parts is set to be 45 degrees.
In the corner part 23a, the two bent parts 25a, 25a of the first unit wound portion 25 are connected to each other by a linear connection part 25b, the two bent parts 26a, 26a of the second unit wound portion 26 are connected to each other by a linear connection part 26b, and the two bent parts 27a, 27a of the third unit wound portion 27 are connected to each other by a linear connection part 27b.
In the corner part 23a, the three unit wound portions 25, 26, 27 in a corresponding positional relationship, that is, the three bent parts 25a, 26a, 27a at the same phase position are placed in line on a straight line extending from one point P.
As a result, in the corner part 23a, the conductive wire of the first unit wound portion 25 and the conductive wire of the second unit wound portion 26 are in contact with each other over substantially entire lengths, and the conductive wire of the second unit wound portion 26 and the conductive wire of the third unit wound portion 27 are in contact with each other over substantially entire lengths.
In other words, the corner part 23a of the air core coil 2 according to the present invention corresponds to a shape formed by approximating an arc shape of three bent parts 25c, 26c, 27c of a first unit wound portion 25, a second unit wound portion 26, and a third unit wound portion 27 shown in
The air core coil 2 according to the present invention can be easily manufactured with using an altered version of the automatic winding machine 10 used in the above first embodiment shown in
In the air core coil manufactured with using the automatic winding machine 10 of the first embodiment, gaps G are generated between the bent parts of the first unit wound portion 25, the second unit wound portion 26, and the third unit wound portion 27 as shown in
Thus, in the present embodiment, in place of the automatic winding machine 10 including the winding core shafts 31, 32, 33, 34 shown in
These four winding core mechanisms 11, 12, 13, 14 can be reciprocated in the direction of bringing away from the center foundation shaft 20 and in the direction of bringing close to the center foundation shaft 20 as well as the four winding core shafts 31, 32, 33, 34 shown in
As shown in
The second winding core mechanism 12 includes a first winding core piece 63 driven and reciprocated along a straight line A3 extending outward from one point S2 on the center foundation shaft 20 side, and a second winding core piece 64 driven and reciprocated along a straight line A4 extending outward from the one point S2. The first winding core piece 63 and the second winding core piece 64 exert a function corresponding to the second winding core shaft 32 of the first embodiment.
The third winding core mechanism 13 includes a first winding core piece 65 driven and reciprocated along a straight line A5 extending outward from one point S3 on the side of the center foundation shaft 20, and a second winding core piece 66 driven and reciprocated along a straight line A6 extending outward from the one point S3. The first winding core piece 65 and the second winding core piece 66 exert a function corresponding to the third winding core shaft 33 of the first embodiment.
The fourth winding core mechanism 14 includes a first winding core piece 67 driven and reciprocated along a straight line A7 extending outward from one point S4 on the side of the center foundation shaft 20, and a second winding core piece 68 driven and reciprocated along a straight line A8 extending outward from the one point S3. The first winding core piece 67 and the second winding core piece 68 exert a function corresponding to the fourth winding core shaft 34 of the first embodiment.
The above eight winding core pieces 61 to 68 can be driven and reciprocated for example by installing a driving and reciprocating mechanism such as a solenoid for each of the winding core pieces in the winding core mechanisms.
Regarding each of the above eight winding core pieces 61 to 68, a surface on which the conductive wire 22 is wound is formed into a mountain shape having a vertex angle of 135 degrees. Therefore, by winding the conductive wire 22 on the pair of two winding core pieces, the two bent parts 25a, 25a of the first unit wound portion 25, the two bent parts 26a, 26a of the second unit wound portion 26, and the two bent parts 27a, 27a of the third unit wound portion 27 forming the corner parts of the air core coil 2 shown in
As a result, a loop shape regulated by the surfaces of the eight winding core pieces 61 to 68 corresponds to a loop shape of the unit wound portions 25, 26, 27 of the air core coil 2 shown in
Configurations of the automatic winding machine 1 of the air core coil 2 according to the second embodiment, the configurations being other than the above description are the same as the automatic winding machine 10 of the first embodiment shown in
In a wire winding step of the air core coil by the automatic winding machine 1 shown in
Next, when the second unit wound portion 26 is wound, by moving all the winding core pieces 61 to 68 to the outer circumferential side by a wire diameter of the conductive wire 22 as in
After that, when the third unit wound portion 27 is wound, by further moving all the winding core pieces 61 to 68 to the outer circumferential side by the wire diameter of the conductive wire 22 and rotating the automatic winding machine 1 in that state, the conductive wire 22 is wound around these winding core pieces 61 to 68. By successively winding the conductive wire 22 on the surfaces of the eight winding core pieces 61 to 68, the eight bent parts 27a to 27a of the third unit wound portion 27 are successively formed, and the bent angle of the bent parts is regulated to be 45 degrees.
In a winding step of the next unit coil portion 23, by rotating the automatic winding machine 1 while gradually moving all the winding core pieces 61 to 68 to the inner circumferential side by the wire diameter of the conductive wire 22, the conductive wire 22 is wound around these winding core pieces 61 to 68.
It should be noted that upon forming two continuous unit wound portions, after forming a first unit wound portion, while pushing out the conductive wire 22 of the unit wound portion from outer circumferential surfaces of the eight winding core pieces 61 to 68 by the conductive wire 22 to be a second unit wound portion, the conductive wire 22 to be the second unit wound portion is wound on the outer circumferential surfaces of the eight winding core pieces 61 to 68, and the second unit wound portion is formed.
By repeating the above actions, an interim product of the air core coil shown in
In the air core coil 2 obtained in such a way, in the corner part 23a as shown in
It should be noted that the configurations of the parts of the present invention are not limited to the above embodiments but can be variously modified within the technical scope described in the claims. For example, a type and the number of times of winding of the unit wound portion are not limited to the above description as a matter of course. It should be understood that regarding the unit wound portion, the type may be two types of the above substantial oblong and the substantial trapezoid and the number of times of winding may be variously set as once, twice, or three times. The number of the bent parts of the unit wound portion in the corner part of the air core coil is not limited to two but may be plural numbers of three or more.
The conductive wire 22 is not limited to a round wire having a circular section but may be a square wire having a rectangular section.
While the invention has been described in connection with various embodiments, it will be understood that the invention is capable of further modifications. This application is intended to cover any variations, uses or adaptations of the invention following, in general, the principles of the invention, and including such departures from the present disclosure as, within the known and customary practice within the art to which the invention pertains.
Number | Date | Country | Kind |
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2011-060706 | Mar 2011 | JP | national |
2011-240798 | Nov 2011 | JP | national |
The present application claims priority from and is a continuation from PCT International Application No. PCT/JP2012/056410, filed Mar. 13, 2012, which claims priority from Japanese Patent Application Serial No. 2011-060706, filed Mar. 18, 2011 and Japanese Patent Application Serial No. 2011-240798, filed Nov. 2, 2011, all of which are incorporated by reference in their entireties.
Number | Date | Country | |
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Parent | PCT/JP2012/056410 | Mar 2012 | US |
Child | 14029530 | US |