JP3953457B2 - Variable inductor and contactless power supply equipment using this variable inductor - Google Patents

Description

  The present invention relates to a variable inductor that adjusts the inductance of a primary induction line of a contactless power supply facility, and a contactless power supply facility that uses the variable inductor.

  In the conventional contactless power supply equipment, a series capacitor is connected to the (primary side) induction line, a series resonance circuit having a constant frequency, for example, a resonance frequency of 10 kHz, is formed, and a large current can be efficiently supplied. Has been. However, the induction line is laid along the moving path of the mobile body that receives power from the induction line, and the installation length differs in each facility, that is, the inductance of the induction line varies depending on each facility. In order to form a resonant circuit, it is necessary to adjust the inductance of the induction line.

A variable inductor used for adjusting the inductance is disclosed in Patent Document 1, for example.
That is, in a state where a cylindrical winding frame, a coil made of a bare lead wire spirally wound around the outer peripheral surface of the winding frame, and an inner peripheral surface of the coil made of a conductive material are in contact with the outer peripheral surface of the coil. A short-circuit cylinder movable along the axis of the reel, and a drive mechanism for reciprocating the short-circuit cylinder along the axis of the reel, and moving the short-circuit cylinder by the drive mechanism The number of turns of the coil to be short-circuited can be changed, and the effective number of turns that can function as an inductor without being short-circuited can be changed from the actual number of turns of the coil to almost zero.

However, in such a variable inductor configuration, since there is a sliding contact portion (a contact portion between the outer peripheral surface of the coil and the short-circuited cylinder), a large current cannot flow.
For example, Patent Document 2 discloses a variable inductor that can solve such a problem and can flow a large current.

That is, a coil bobbin wound with a winding, a first core incorporated in the coil bobbin, a second core that abuts against an end of the first core to form a closed magnetic path, an end of the abutted first core, and a first core An elastic member that is placed between two cores to form a core gap, a fixing member that fastens and fixes the first core, the second core, and the elastic member, and a tightening adjustment unit that adjusts the tightening degree by the fixing member. By adjusting the tightening degree of the first core and the second core by the tightening adjustment unit, the variable range of the inductance value can be linearly increased even when a large current flows.
Japanese Patent Laid-Open No. 11-144963 JP 2002-75743 A

  However, in the variable inductor disclosed in Patent Document 2, the core cannot be removed from the coil, so that the inductance cannot be changed to almost zero, unlike the variable inductor disclosed in Patent Document 1. There was a problem. Therefore, the inductance of the induction line cannot be adjusted depending on the length of the induction line.

  Further, in the variable inductor disclosed in Patent Document 2, if it is possible to remove the core from the coil, the structure becomes complicated and a considerable space is required for separating the core, resulting in an increase in size. There was a problem.

  Accordingly, an object of the present invention is to provide a small variable inductor capable of flowing a large current and adjusting an inductance to near 0 in a wide range.

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is characterized in that two hollow coil bobbins each having a winding wound thereon, and two first cores that can be respectively inserted into and removed from the coil bobbins. A second core joined to the two coil bobbins and abutted against one end of the two first cores to form a magnetic path; and joined to the other end of the two first cores. A core and a third core that forms a closed magnetic circuit with the second core, the second core and the two coil bobbins, and the two first cores and the third core are configured to be close to and away from each other,
Two windings are wound around one coil bobbin of the two coil bobbins, and the number of windings of these two windings and one winding wound around the other coil bobbin is different from each other. And the distribution of magnetic flux generated in each coil bobbin when the number of windings wound around each of the two coil bobbins is used in series with the winding wound around each of the two coil bobbins is averaged. This is characterized in that the number of windings to be changed is used.

According to the above configuration, the number of windings is selected by the combination of the three windings wound around the two coil bobbins, and the second core and the two coil bobbins are connected to the first core and the third core. The inductance of the variable inductor is adjusted by approaching and moving away. At this time, if the windings are selected so that the number of windings is reduced and the coil bobbin is separated (separated) from the first core, the inductance is reduced and reduced to near zero, and the number of windings is increased. When the winding is selected and the coil bobbin is moved closer to the first core, the inductance increases, and the variable width of the inductance increases. A closed magnetic path is formed of one first core, the third core, the other first core, the second core, and the one first core. Further, the winding is divided into two for one coil bobbin and one for the other coil bobbin, so that the length occupied by one winding and the distance to be removed from the first core can be reduced. It is possible to reduce the size.
In addition, since the three windings wound around the two coil bobbins have different numbers of windings, the range of selection of combinations of the number of windings is widened.
Further, when the number of windings wound around the two coil bobbins is used by connecting the windings wound around the two coil bobbins in series, the magnetic flux distribution generated in each coil bobbin is averaged. By using the number of wires , the leakage magnetic flux is reduced and the efficiency is improved. If there is a deviation in the magnetic flux distribution on one side, the leakage magnetic flux increases in one of the first cores, and the other first core generates heat.

The invention according to claim 2 is the invention according to claim 1, wherein the first core is formed by stacking hollow ferrite blocks, and the ferrite block at the joint portion with the third core The ferrite block is filled with ferrite .

  According to the above configuration, when the coil bobbin approaches the first core, the first core generates heat due to the magnetic flux. However, by adopting a hollow structure, heat dissipation is promoted, the first core generates heat, and the operating temperature limit is reached. It is avoided that it exceeds. Also, at the joint with the third core where the magnetic flux is concentrated, the magnetic flux easily passes by filling the hollow with ferrite, and heat generation is suppressed.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the second core and the third core are formed by combining fine ferrite pieces. Is.

  According to the above configuration, by combining fine ferrite pieces, a fine gap is formed and a leakage magnetic flux is intentionally generated. Therefore, heat generation due to eddy current loss in the second core and the third core is reduced, and heat generation. Thus, exceeding the operating temperature limit is avoided.

The invention described in claim 4 is the invention described in claim 3, characterized in that a heat radiation sheet is attached to the second core.
According to the above configuration, when the heat generated by the second core is dissipated by the heat radiating sheet, the fine unevenness of the surface of the ferrite piece is formed by the heat radiating sheet, and a flat surface having no unevenness is formed, and the heat radiating sheet fixes the second core Because it functions as a cushioning material, it is resistant to vibration.

The invention according to claim 5 is the invention according to any one of claims 1 to 4 , wherein the surface of the third core is joined to the surface to which the two first cores are joined. Further, it is characterized in that it is expanded outward by the width of the winding wound around each coil bobbin.

According to the above configuration, the inductance is increased by expanding the third core, and when the first core is accommodated in each coil bobbin, the leakage magnetic flux is reduced and the heat generation is reduced.
According to a sixth aspect of the present invention, an induction line is disposed along a moving path of a moving body, and a power supply device that supplies a high-frequency current to the induction line is provided. A coil is provided, and the moving body is a non-contact power feeding facility that feeds a load by an electromotive force induced in the pickup coil,
A variable inductor and a capacitor connected in series to the induction line and forming a resonant circuit having a frequency of the high-frequency current, the variable inductor including a hollow first coil bobbin wound with one or a plurality of windings A hollow second coil bobbin around which one or a plurality of windings are wound, two first cores that can be put in and out of the first coil bobbin and the second coil bobbin, and one end portions of the two first cores And a second core that forms a magnetic path, and a second core that is joined to the other ends of the two first cores and forms a closed magnetic path with the two first cores. The second core and the two coil bobbins are configured to be close to and away from the first core and the third core, and one coil bobbin of the two coil bobbins has two windings. The winding, these two windings and the other of the coil bobbin in both the one winding number of different number of turns to each other of the windings and of the wound, the winding number of the two respective wound winding bobbin When the windings wound around the two coil bobbins are connected in series, the magnetic flux distribution generated in each coil bobbin is averaged to the number of windings, and the windings wound around the first coil bobbin and the winding Of the windings wound around the second coil bobbin, one or a combination thereof is connected to the induction line, and the inductance of the connected winding is such that the second core and the two coil bobbins are the first core and the first winding. It is characterized in that it is adjusted by approaching and moving away from the three cores.

According to the above configuration, the number of windings is selected by a combination of three windings wound around two coil bobbins , and the second core and the two coil bobbins are further connected to the first core and the third core. The inductance of the variable inductor is adjusted by making it approach and separate. At this time, if the windings are selected so that the number of windings is reduced and the coil bobbin is separated (separated) from the first core, the inductance is reduced and reduced to near zero, and the number of windings is increased. When the winding is selected and the coil bobbin is brought closer to the first core, the inductance increases.

In the variable inductor according to the present invention, the number of windings is selected by a combination of three windings wound around two coil bobbins, and the second core and the two coil bobbins are connected to the first core and the third core. By moving close to and away from each other, the inductance of the variable inductor can be adjusted to near zero in a wide range, and since there is no contact portion, a large current can flow, and two windings are provided on one coil bobbin, Since the other coil bobbin is divided into one, the length occupied by one winding and the distance from the first core can be reduced, and the variable inductor can be miniaturized. Have.
Furthermore, the variable inductor of the present invention can widen the selection range of the combination of the number of windings by making the three windings wound around the two coil bobbins different from each other. The number of windings in which the magnetic flux distribution generated in each coil bobbin is averaged when the number of windings wound around each of the two coil bobbins is used by connecting the windings wound around the two coil bobbins in series. more that a the may be leakage flux to increase the efficiency is reduced, has the effect that.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a variable inductor according to an embodiment of the present invention, and FIG. 2 is an exploded view of the variable inductor.

  As shown in FIGS. 1 and 2, the variable inductor F includes two hollow coil bobbins 1 and 2, two first cores 3 that can be put in and out of the coil bobbins 1 and 2, and two coil bobbins 1 and 2. 2 and joined to one end of the two first cores 3 to form a magnetic path, and joined to the other end of the two first cores 3, A third core 5 that forms a closed magnetic path with the second core 4 is provided.

  Each of the coil bobbins 1 and 2 has four U-shaped bobbin bodies 7 made of bakelite, as shown in FIGS. 2 to 4, with a gap between them and a concave portion of the bobbin body 7 facing outward. These bobbin bodies 7 are arranged in a square shape, and are fixed to a flat plate-like upper plate 8 made of bakelite with the four corners cut off. Of these coil bobbins, the first coil bobbin 1 is wound with a first coil winding 9 having 3 turns (the number of windings) on the inside, and a further 4 turns of the second coil winding on the outside of the first coil winding 9. The wire 10 is wound, and the second coil bobbin 2 is wound with a third coil winding 11 having a total of 6 turns, 3 turns on the inside and 3 turns on the outside, and the coil windings wound on the coil bobbins 1 and 2 are wound. The numbers of windings of the wires 9, 10, and 11 are different from each other, and the total number of windings wound around the two coil bobbins 1 and 2 is substantially the same. Further, as shown by arrows in FIG. 4, the coil windings 9, 10, and 11 are wound at the terminal block (described later) side on the inner side where the coil bobbins 1 and 2 are opposed, and are wound outside. . The upper plate 8 is provided with a round hole 12 in the center.

  In addition, as shown in FIG. 5, the second core 4 has a first core portion 17 to which the first coil bobbin 1 is joined via a floor plate 13 and the upper plate 8 on a flat bed plate 13 made of Bakelite. A second core portion 18 to which the second coil bobbin 2 is joined via the floor plate 13 and the upper plate 8, and a first magnetic flux passage between the core portions 17, 18 in contact with the core portions 17, 18. A three-core portion 19 is provided.

  Each of the core portions 17, 18, and 19 is formed by combining fine ferrite pieces. That is, the first core portion 17 is formed by joining the convex portions of the two E-shaped ferrite cores 14 and inserting the I-shaped ferrite cores 15 in the spaces resulting from the joining, thereby forming the blocks 16. Sixteen 16 are arranged in contact with a quadrangular shape, and the second core portion 18 is formed by arranging six blocks 16 in contact with the quadrangular shape. The third core portion 19 is formed by arranging I-shaped ferrite cores 15 across the gap between the core portions 17 and 18 and the side surfaces thereof. The floor plate 13 is provided with a round hole 20 at the center of the gap so as to face the round hole 12 at the center of the upper plate 8.

  Further, as shown in FIGS. 6 (a) and 6 (b), the first core 3 forms a hollow ferrite block 21 by joining the convex portions of the two E-shaped ferrite cores 14, and the formed hollow ferrite Three blocks 21 are arranged in a straight line and stacked in five stages. At the lowest stage, which is the joint with the third core 5, the hollow ferrite block 21 is filled with an I-shaped ferrite core 15, and the side surfaces of these ferrite blocks 21 are filled. A thin wall plate 22 made of bakelite is arranged, and a glass tape 23 is wound around the wall plate 22 and fixed so as not to lose its shape.

  Further, as shown in FIG. 6, the third core 5 is formed in the same manner as the second core 4 by combining fine ferrite pieces, and the first core portion 17, the second core portion 18, and the third core 5 are formed. The core part 19 is provided on a floor plate 24 made of bakelite. Further, the surface of the third core 5 is expanded outwardly by the width of the coil windings 9, 10, 11 wound around the coil bobbins 1, 2 than the surface where the two first cores 3 are joined. . On the floor plate 24, bakelite collars 25 having the same height as the third core 5 are arranged at the four corners of each first core 3, and the first core 3 is formed by a bakelite presser plate 26 passed between the collars 25. The third core 5 is fixed on the floor plate 24, and two collars 25 are arranged outside the third core 5 at the center of the floor plate 24 (between the first cores 3). The made receiving block 27 is fixed. At the center of the receiving block 27, a screw hole 28 for a bolt described later is provided.

In the variable inductor F, the second core 4 and the two coil bobbins 1 and 2 and the two first cores 3 and the third core 5 are configured to be close to and away from each other.
That is, a Bakelite flat upper base plate 31 to which the second core 4 and the two coil bobbins 1 and 2 are joined, and the first core 3 and the third core 5 are joined to face the upper base plate 31. A flat base plate 32 made of aluminum is provided, and these base plates 31 and 32 can be moved apart from each other.

  The upper base plate 31 is provided with round holes 34, 35, 36 penetrating perpendicularly to the center, the four ends, and the center of the left and right ends, and the round hole 34 is formed at the center of the upper base plate 31. An adjustment bolt 37 that passes through the circular hole 20 of the floor plate 13 and the circular hole 12 of the upper plate 8 and is screwed into the screw hole 28 provided at the center of the floor plate 24 of the fifth core 5, and the adjustment bolt 37 A fixed base 38 made of bakelite is provided to support a proper posture, and bushes 39 made of bearing bearings penetrating through the respective round holes 35 are provided on four sides of the upper base plate 31.

  The lower base plate 32 includes a bakelite fixing plate 41, a shaft 42 supported and guided by the bushes 39, and a holder 43 that supports the shaft 42 in a vertical posture via the fixing plate 41. The positioning shaft 45 that passes through the round holes 36 at the center of the left and right ends of the upper base plate 31, the lower plate 46 for positioning made of bakelite that supports the shaft 45 in a vertical posture, and the first coil winding 9 A terminal block 47 having four terminals to which the external terminals of the second coil winding 10 and the third coil winding 11 are connected, and a terminal block fixing plate 48 for supporting the terminal block 47 are provided and joined. The three cores 5 and the first core 3 are fixed. Each positioning shaft 45 is provided with a nut 49.

  Then, the floor plate 13 (second core 4) is joined to the upper plate 8 on which the two coil bobbins 1 and 2 are fixed, the round hole 12 of the upper plate 8 and the round hole 20 of the second core 4 are joined together. Via a heat dissipating sheet 52 having a round hole 51 through which the adjustment bolt 35 is passed in the center, which is attached to cover the surface of the core 4 (the round hole 51 is made to coincide with the round holes 12 and 20), and the second core 4 The upper base plate 31 is joined with the collar 53 having the same height as that of the upper base plate 31. At this time, the adjustment bolt 37 passes through the round hole 51 of the heat dissipation sheet 52, the round hole 20 of the second core 4, and the round hole 12 of the upper plate 8.

  The shafts 42 of the lower base plate 32 are passed through the bushes 39 of the joined upper base plate 31, and the positioning shaft 45 of the lower base plate 32 is inserted into the round holes 36 at the center of the left and right ends of the upper base plate 31. The adjustment bolt 37 is temporarily tightened into the screw hole 28, and then the upper base plate 31 is temporarily fixed by the nut 49 of the positioning shaft 45. Subsequently, the external terminals of the coil windings 9 and 10 and the coil winding 11 are connected in series at the four terminals of the terminal block 47 so that the start and end of winding are conducted as shown in FIG.

  Due to the configuration of the variable inductor F, the nut 49 is loosened and the adjustment bolt 37 is adjusted, whereby the upper base plate 31 is guided by the four shafts 42 to move up and down, and the coil bobbins 1 and 2 are connected to the first core 3. Approaches and leaves (in and out), and the inductance of the variable inductor F is adjusted.

  In the terminal block 47, the number of windings of the coil is selected by one of the coil windings 9, 10, 11 or a combination thereof. That is, 3 turns, 4 turns, 6 turns, 7 (= 3 + 4) turns, 9 (= 3 + 6) turns, 10 (= 4 + 6) turns, or 13 (= 3 + 4 + 6) turns are selected.

  Then, when the windings are selected so that the number of windings is reduced, and the coil bobbins 1 and 2 are separated (separated) from the first core 3 as shown in FIG. The windings are selected so that the number of windings is reduced to the vicinity and the number of windings is increased, and the coil bobbins 1 and 2 are brought closer to the first core 3, and as shown in FIG. When one core 3 is accommodated, the inductance increases, and therefore the inductance can be varied to near 0 in a wide range. At this time, the closed magnetic path is formed with one first core 3 -the third core 5 -the other first core 3 -the second core 4 -the one first core 3.

When the adjustment of the inductance is completed, the nut 49 of the positioning shaft 45 is tightened to fix the position of the upper base plate 31, that is, the positions of the coil bobbins 1 and 2 and the first core 3.
FIG. 8 shows a circuit configuration of a contactless power supply facility using the variable inductor F having the above configuration. The moving body that receives power from the non-contact power supply facility is used as a transport cart.

  A guide line 62 is disposed along the movement path of the transport carriage 61, and a power supply device 63 that feeds high-frequency current to the guide line 62 is provided. A pickup coil 64 is provided on the transport carriage 61 so as to face the dielectric line 62. 61 feeds a load (not shown) by an electromotive force induced in the pickup coil 64.

  The power supply device 63 includes an AC200 V3-phase AC power supply 71, a converter 72, an inverter 73, a transistor 74 and a diode 75 for overcurrent protection. The converter 72 includes a full-wave rectifier diode 76, a coil 77, a capacitor 78, a resistor 79, and a transistor 80 that short-circuits the resistor 79. The inverter 73 is driven by a rectangular wave signal. It comprises a transistor (switch element) 81 assembled in a full bridge and a current limiting coil 83.

  An induction line 62 is connected to the inverter 73, and a variable inductor F and a capacitor C are connected to the induction line 62 in series to form a resonant circuit having a frequency of a high-frequency current.

The effect | action by the circuit structure of the said power supply device 63, the induction track | line 62, and the conveyance trolley | bogie 61 is demonstrated.
First, the inductance of the induction line 62 is adjusted by the variable inductor F so as to resonate at a frequency of a high-frequency current fed from the inverter 73 to the induction line 62, for example, a frequency of 10 kHz. That is, the induction line 62 is laid along the movement path of the transport carriage 61 that receives power from the induction line 62, and the installation length is different in each facility, that is, the inductance of the induction line 62 is different. Is adjusted so that the inductance of the induction line 62 satisfies the resonance condition.

  Next, AC 200 V 3 phase AC is output from the AC power supply 71. This AC200 V3-phase alternating current is converted into direct current by the converter 72, converted to a high frequency (for example, 10 kHz) by the inverter 73, and supplied to the induction line 62. For example, a 120 A high frequency current is supplied. A large electromotive force is generated in the pickup coil 64 of the transport carriage 61 due to the magnetic flux generated in the two upper and lower induction lines 62, and the alternating current generated by the electromotive force is fed to a load, for example, a travel motor, and is transported. 61 is run.

  As described above, according to the present embodiment, the coil winding is divided into at least two by the coil bobbins 1 and 2, and the number of windings is selected by selecting any one or a combination of the windings, Further, by moving the second core 4 and the two coil bobbins 1 and 2 closer to and away from the first core 3 and the third core 5, the inductance of the variable inductor F can be adjusted to near 0 in a wide range, and contact can be made. Since there is no portion, a large current can flow, and the winding is divided into at least two by the coil bobbins 1 and 2 so that the length occupied by one winding (the length of the coil bobbin is 4 turns). And the distance to be removed from the first core 3 can be reduced, and the variable inductor F can be reduced in size.

  Further, according to the present embodiment, when the coil bobbins 1 and 2 are approached to the first core 3 (when the first core 3 is accommodated in the coil bobbins 1 and 2), the first core 3 is buried with ferrite. If it is, the magnetic flux generated by the large current flowing in the coil windings 9, 10, and 11 generates heat immediately and exceeds the operating temperature limit, but the heat dissipation is promoted by making the first core 3 have a hollow structure, Further, since the coil bobbins 1 and 2 are formed with four gaps between the four bobbin bodies 7, heat generated from the first core 3 in the coil bobbins 1 and 2 can be radiated by these gaps. It is possible to avoid 3 exceeding the operating temperature limit due to heat generation. Further, by filling the hollow with ferrite at the junction with the third core 5 where the magnetic flux concentrates, the magnetic flux can easily pass and heat generation can be suppressed.

  Further, according to the present embodiment, the second core 4 and the third core 5 are formed by combining fine ferrite pieces, that is, the E-shaped ferrite core 14 and the I-type ferrite core 15, thereby forming a fine gap. By intentionally generating the leakage magnetic flux, the heat generation due to the eddy current loss in the second core 4 and the third core 5 can be reduced, and it is possible to avoid exceeding the operating temperature limit due to the heat generation.

  Further, according to the present embodiment, the heat generation of the second core 4 is radiated by the heat dissipation sheet 52, so that the second core 4 can be prevented from generating heat and exceeding the operating temperature limit. The surface of the ferrite piece, that is, the E-shaped ferrite core 14 and the I-type ferrite core 15, is formed on a flat surface having no irregularities by the heat radiating sheet 52, and the buffer when the heat radiating sheet 52 fixes the second core 4. Since it functions as a material, it can be made strong against vibration.

  Further, according to the present embodiment, the number of windings is selected by the combination of the three coil windings 9, 10, 11 wound around the two coil bobbins 1, 2, and the number of windings is different from each other. Thus, the range of selection of combinations can be widened.

  In addition, according to the present embodiment, when the coils wound around the two coil bobbins 1 and 2 are connected in series, the amount of magnetic flux generated in each coil bobbin 1 and 2 is substantially the same, and the magnetic flux distribution is By averaging, leakage flux is reduced and efficiency can be improved. If there is a deviation in the number of windings on one side, the leakage flux increases in the one first core 3 and the other first core 3 generates heat.

  Further, according to the present embodiment, the inductance can be increased by expanding the third core 5 further outward from the position of the first core 3, and when the first core 3 is accommodated in the coil bobbins 1 and 2, the leakage magnetic flux And heat generation can be reduced.

  In the present embodiment, the number of windings wound around the two coil bobbins 1 and 2 is set to 3 turns, 4 turns, and 6 turns. It is only necessary that the number of turns (the number of windings) wound around is substantially the same. The number of windings wound around the two coil bobbins 1 and 2 is two and one, but the number is not limited to one and may be one or more.

  In the present embodiment, the two coil bobbins 1 and 2 are moved up and down to bring the coil bobbins 1 and 2 and the third core 3 close to each other. However, the third core 3 and the fourth core 5 can be moved. The coil bobbins 1 and 2 and the third core 3 may be moved closer to and away from each other.

  In the present embodiment, the second core 4 and the third core 5 are configured by combining the E-shaped ferrite core 14 and the I-type ferrite core 15, but are limited to such ferrite cores 14 and 15. However, it may be composed of fine ferrite pieces.

It is a perspective view of the variable inductor in an embodiment of the invention. It is an exploded block diagram of the variable inductor. It is the front and bottom view of the coil bobbin of the variable inductor. It is a figure which shows how to wind the coil winding of the coil bobbin of the variable inductor. It is the top and front view of the 2nd core of the variable inductor. FIG. 4 is a plan view and a front view of a first core and a third core of the variable inductor, and a plan view of a third core. It is action | operation explanatory drawing of the variable inductor. It is a circuit block diagram of the non-contact electric power supply equipment provided with the variable inductor.

Explanation of symbols

1, 2 Coil bobbin 3 First core 4 Second core 5 Third core 9, 10, 11 Coil winding 14 E-shaped ferrite core 15 I-shaped ferrite core 21 Ferrite block 31 Upper base body 32 Lower base body 37 Adjustment bolt 39 Bush 42 Shaft 45 Positioning shaft 47 Terminal block 52 Heat radiation sheet 61 Carriage carriage 62 Induction line 63 Power supply device 64 Pickup coil F Variable inductor C Capacitor

Claims (6)

Two hollow coil bobbins each wound with a winding;
Two first cores that can be put in and out of the coil bobbins,
A second core joined to the two coil bobbins and abutted against one end of the two first cores to form a magnetic path;
A second core joined to the other ends of the two first cores, and a first core and a third core forming a closed magnetic circuit with the second core;
The second core and the two coil bobbins, and the two first cores and the third core are configured to be close to and away from each other,
Two windings are wound around one coil bobbin of the two coil bobbins, and the number of windings of these two windings and one winding wound around the other coil bobbin is different from each other. And the distribution of magnetic flux generated in each coil bobbin when the number of windings wound around each of the two coil bobbins is used in series with the winding wound around each of the two coil bobbins is averaged. A variable inductor characterized in that the number of windings is reduced . 2. The variable inductor according to claim 1, wherein the first core is formed by stacking hollow ferrite blocks, and the ferrite block is filled with ferrite in a ferrite block at a joint portion with the third core. The variable inductor according to claim 1 or 2, wherein the second core and the third core are formed by combining fine ferrite pieces. The variable inductor according to claim 3, wherein a heat radiation sheet is attached to the second core. The surface of the third core is further expanded outwardly by the width of the winding wound around each coil bobbin from the surface where the two first cores are joined. Item 5. The variable inductor according to any one of Item 4. An induction line is disposed along a moving path of the moving body, and a power supply device that supplies high-frequency current to the induction line is provided. A pickup coil is provided on the moving body so as to face the dielectric line. A non-contact power supply facility that supplies power to a load by electromotive force induced in a coil,
A variable inductor and a capacitor connected in series to the induction line and forming a resonant circuit having a frequency of the high-frequency current;
The variable inductor includes a hollow first coil bobbin wound with one or more windings, a hollow second coil bobbin wound with one or more windings, the first coil bobbin and the second coil bobbin. Two first cores that can be inserted into and removed from the coil bobbin, a second core that abuts against one end of the two first cores to form a magnetic path, and is joined to the other end of the two first cores. Two first cores and a third core that forms a closed magnetic circuit with the second core, and the second core and the two coil bobbins are configured to be able to approach and separate from the first core and the third core. Of the two coil bobbins, two windings are wound around one coil bobbin, and the number of windings of these two windings and one winding wound around the other coil bobbin is different from each other. And two Each winding number of the wound winding the coil bobbin, and the winding number of the magnetic flux distribution is averaged generated in each coil bobbin when to use each wound winding the two coil bobbins are connected in series ,
Of the winding wound around the first coil bobbin and the winding wound around the second coil bobbin, one or a combination thereof is connected to the induction line,
The non-contact power supply facility, wherein the inductance of the connected winding is adjusted by moving the second core and the two coil bobbins closer to and away from the first core and the third core.

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