JPH0347425Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used, for example, in drive coils or power generation coils for brushless motors, linear motors, etc., and a patterned conductor is formed like a laminated sheet coil in which multiple sheet coils are laminated and bonded and solidified. This invention relates to a laminated wiring body in which insulating sheets are laminated.

The sheet coil has a conductor 74 in the coil cross section,
75 and the drive coil terminals 53a to 53d protrude as the terminal portion 50. Speed detection coil 73
The length in the radial direction is assumed to be almost uniform, but
Drive coils 45a, 45b ₁ , 45b ₂ , 45C ₁ , 4
Regarding the portion where the connection is made at each inner end of the coil _5c2 , a coil is formed only in the portion outside the connection line, and a short coil 73a is formed. Corresponding to the portion where the length of some of the coils is shortened in this way, some of the coils are lengthened inward, for example, as shown by 73b, in order to balance the vibration of the output. In order to increase the space factor of the coil 73, the insulating layer is made as thin as possible, for example, several μm.

When stacking multiple sheet coils to make a laminated sheet coil, at least two lead wires are pulled out from each sheet coil and connected by soldering etc. in order to make connections between each sheet coil. Ta. Therefore, as the number of laminated layers increases, the space for connection increases proportionally.This connection part is not involved in electrical action as a coil, and the increase in the space occupied by this connection part is due to the conductor's occupation. This results in a result that is contrary to the purpose of increasing the product moment.

That is, in the conventional laminated sheet coil, as shown in FIG. 1, a coil 112 is formed on an insulating sheet 111, and n sheet coils 113 113 ₁ to 113 _o
The laminated adhesive is solidified. Each sheet coil 113 ₁
Lead wire portions 114 are formed to protrude from the laminate from ~113 _o , and adjacent lead wire portions 114 are connected to each other by soldering so that the entire coil 112 is connected in series. In this case, the lead wire portions 114 are sequentially shifted so that they do not overlap so that the lead wire portions 114 can be easily connected and are not connected to unnecessary lead wire portions.
Therefore, the space for connection increases in proportion to the number of stacked sheet coils 113.

The purpose of this invention is to provide a laminated wiring body that can reduce the space required for the connection between insulating sheets on which patterned conductors are formed, and can be constructed in a compact size as a whole.

According to this invention, insulating sheets on which patterned conductors are formed are stacked to form a laminate, and at the connection part between the sheets, the connection piece is connected to the conductor on each insulating sheet, and the connection piece corresponds to the connection part. and each insulating sheet interposed between these extended connection pieces has a corresponding connection piece that is not connected to the pattern conductor on the insulation sheet. These connecting pieces reach the edges of the insulating sheets, and a conductive layer is formed in the thickness direction of the laminate so as to be in continuous contact with the edges of the insulating sheets and connecting pieces. Connections between the upper pattern conductors are made. Therefore, it is not necessary to lead out the terminal portion from the laminate for connection, and the structure can be made compact.

Prior to explaining this invention, a general configuration example of a motor to which a laminated wiring body according to this invention is applied will be explained first. FIG. 2 shows an axial flux type motor, in which a motor case 11 is made of a flat magnetic material, and a rotating shaft 12 is inserted through the motor case 11.
4, it is rotatably held in the motor case 11. Rotating shaft 12 inside motor case 11
A parallel permanent magnet rotor 15 is mounted on the top, and this rotor 15 has a rotating shaft 12 on its end surface.
Magnetic poles that generate magnetic flux parallel to the rotation axis 12 are formed at equal angular intervals around the rotating shaft 12. This rotor 1
A first phase drive coil 16 and a second phase drive coil 17 are provided opposite the end surfaces of the coils 5 and 5, respectively. Drive coils 16 and 17 are mounted on a wiring board 18 on which wiring for these drive coils and an angular position detecting element for the rotor 15 are mounted. 1st
For example, as shown in FIG. 3, the phase drive coil 16 is composed of a plurality of coils 19 arranged at equal angular intervals on a circumference centered on the rotating shaft 12. In this example, eight coils 19 are used, and these are of the same size, and the relationship between the coils 19 and the magnetic poles of the permanent magnet 15 is as shown in the figure.
and each pole of S and in a certain rotational state, the coil 1
The number of poles and the number of coils are selected to be the same so that the centers of the coils 9 and 9 face each other. 2nd phase coil 1
7 is the coil 1 angularly relative to the first phase coil 16.
They are arranged shifted by half a pitch of 9. This axial flux type motor is configured such that magnetic flux generated from the rotor 15 and parallel to the rotating shaft 12 passes through the first phase coil 16 and the second phase coil. The rotation of the motor by supplying power to the first phase coil and the second phase coil, that is, the rotation operation of the rotor 15, is conventionally known, so a description thereof will be omitted.

In such a motor, a speed detection coil 21 for detecting the rotational speed of the motor is attached to the substrate 18 in order to perform speed control, for example.
The rotating magnetic flux of the drive coil was detected at a higher frequency than the rotation itself by the drive coil. Conventionally, the speed detection coil 21 has been attached to the substrate 18 instead of being attached to an insulating substrate, and the space occupied by the coil 21 has been relatively large.

4 and 5 show an example of a sheet coil as a driving coil used in this invention, FIG. 4 shows one side, for example, the front side, and FIG. 5 shows the back side. In this example, a conductor layer, for example, a copper foil 32, is formed over almost the entire surface of the insulating sheet 31, and the coils ₁₁ to ₁₈ are adjacent to this copper foil 32 on the same circle with a point 33 as the center. An array is formed at equal intervals. Each coil is configured as a substantially triangular spiral coil, each configured as a right-handed winding in FIG. ing. Therefore, between each adjacent groove 34 is a coil winding, ie, a coil conductor 35.

As will be explained later, in the center of the arrangement of the coils ₁₁ to ₁₈ , connection pieces for connecting the coils when sheet coils are provided in multiple layers are radially formed. That is, the connection pieces 36a ₁ and 36a ₂ are connected to the outer end (start of winding) 46 of the coil 1 ₁ and the outer end (end of winding) 49 of the coil 1 ₈ , respectively.
Furthermore, auxiliary connecting pieces 37a ₁ and 37a ₂ are formed radially next to these connecting pieces 36a ₁ and 36a ₂ , respectively. Furthermore, in this example, in the case of a three-phase motor, these connection pieces 36 constitute connection pieces for the second and third phases.
connecting pieces 36b 1 , 36b ₂ , 37b ₁ , 36b ₂ , which are angularly shifted by 120 _° around point 33 in correspondence with a ₁ , 36a ₂ , 37a ₁ , 37a ₂ , and further 120° from this The connecting pieces 36c ₁ , 36 are shifted from each other.
c ₂ , 37c ₁ , and 37c ₂ are formed radially around the point 33, respectively. Connection piece 36b ₁ , 36
b ₂ , 37b ₁ , 37b ₂ , 36c ₁ , 36c ₂ , 37c ₁ ,
37 _c2 is not connected to any of the coils 1 ₁ to 1 _S. The inner end of each coil 1 ₁ to 1 ₈ is the connection part 2 ₁
In addition, positioning patterns 54 are formed on the outside of the coils 1 ₁ to 1 ₈ at intervals of 30° in the _figure .

As shown in FIG. 5, a copper foil 32 is formed on the back side of the insulating sheet 31 in almost the same way as on the front side, and furthermore, coils 1 ₁ to 1 ₈ and coils 3 ₁ to 3 ₈ facing each other with the insulating sheet 31 interposed therebetween are formed. It is formed. When viewed from the back side, the coils 3 ₁ to 3 ₈ are formed into right-handed, almost triangular spirals in this example, similar to the coils on the front side, and these coils 1 ₁ to 1 ₈ and coils 3 ₁ to 3 ₈ When viewed from the same side, it is wound in the opposite direction. The center of the array of coils 3 ₁ to 3 ₈ is point 3
It is said to be 3. Furthermore, radial connection pieces 36a _{1 ′} to 36 are provided at the center surrounded by the coils ₃ 1 to 3 ₈ .
c ₂ ′, 37a ₁ ′ to 37c ₂ ′ are connected to the connection pieces 36a ₁ ′ to 36c ₂ ′, 37a ₁ to 37 via the insulating sheet 31
It is formed in the same way as c ₂ . However, for the coil sheet on the back side, these connection pieces are coil 3.
It is not connected to any of ₁ to ₃₈ . Connection portions 4 ₁ to 4 ₈ are provided at the inner ends of each coil 3 ₁ to 3 ₈ respectively.
are provided and are electrically connected to the connecting portions 2 ₁ to 2 ₈ on the front side through an insulating sheet 31 .

The coils 1 ₁ to 1 ₈ on the front side and the coils 3 ₁ to 3 ₈ on the back side are all connected in series. For this reason, the coils 3 ₁ to 3 ₂ are connected to each other in their outer adjacent parts, the coils 1 ₂ and 1 ₃ are likewise connected to each other in their adjacent outer parts, and so on in the outer parts of the adjacent coils. Two connections are made between the front side coil and the back side coil,
Moreover, the connection position is shifted by one coil between the front side and the back side.

As a result, for example, a current supplied from the outer end (start of winding) 46 of the coil on the front side flows outside the coil 1 ₁ to reach the connection part 2 ₁ , and from there passes through the connection part 4 ₁ on the back side of the coil 3 ₁ . flows outward,
From this outer end _, pass through the outside of coil 3 ₂
Flows inside the coil 1 ₂ on the front side from its inner end 4 ₂
flows from the inside to the outside, and from this coil 1
₃ flows from the outside to the inside, reaches the inner end of the coil 3 ₃ , flows from the inside of this coil 3 ₃ to the outside,
In the same way, current flows through the front side coil and the opposing back side coil, flows through the adjacent coils on the same side, and sequentially flows through the coils.Finally, the current flows through coil 1 from the inside to the outside, and the current flows to the outer end of coil ₁₈ . , that is, the winding end 49 is reached. In this way, the magnetic fluxes generated by the currents flowing through the front side coil and the back side coil were added.

To make a coil sheet in which a plurality of coils are formed on both sides of the insulating sheet 31 shown in FIGS. 4 and 5, for example, as shown in FIG. Insulating thin film 6 on foil 32
5 is formed. The copper foil 32 is, for example, 10μ to 1mm.
For example, a thickness of about
The insulating thin film 65 can be coated on the copper foil 32, has heat resistance, and has excellent electrical insulation properties, such as polyurethane resin, epoxy resin, or phenol resin. A baking paint such as can be used. The insulating thin film 65 is formed to have a thickness of, for example, 1 μ to 20 to 30 μ, preferably about 3 to 5 μ, and is free from pinholes. Formation of such an insulating thin film 65 can be carried out in the same manner as coating an insulating coating on enameled wires, formal wires, etc., and the insulating coating for these enameled wires and formal wires has a thickness of about 2 to 3 μm. Moreover, it is an excellent product with no pinholes. Similar to the insulating coating for such conductors, the coating of the insulating thin film 65 can be applied, for example, by impregnating felt with a baking paint, applying this to the conductor layer 32, and then drying it, for example.
It is dried by passing it through an oven at 150°C for about 2 to 3 seconds. The thickness of the insulating thin film 65 can be adjusted to a desired thickness by applying it once, drying it, and then repeatedly applying it again to control the number of times it is applied. Two insulating thin films 65 formed on the conductor layer 32 in this manner are bonded together with the insulating thin films mutually aligned. That is, as shown in FIG. 6B, the insulating thin film 6
An adhesive 66 is applied on top of 5, and the adhesive is preferably an adhesive with excellent heat resistance such as a polyester resin adhesive or an epoxy adhesive, and such an adhesive is diluted with a solvent such as thinner. Similar to the coating of the insulating thin film 65 described above, the insulating thin film 65 is coated by impregnating it into felt or the like and then being dried naturally or in a vacuum chamber to evaporate the solvent. In this case, the adhesive 66 can be dried by heating at a temperature that does not harden the adhesive. Furthermore, as shown in FIG. 6C, a similarly formed copper foil 32' with an insulating thin film 67 formed on the bottom surface is placed on the adhesive 66, and the insulating thin film 6 is placed on the adhesive 66.
By arranging and adhering the 7 sides and passing the overlapping state between a pair of rollers, the two can be strongly adhered. Depending on the type of adhesive 66, the adhesive 66 is cured by natural drying or heating. In this way, the insulating sheet 31 is constituted by the insulating thin films 65 and 67 and the adhesive 66. Copper foils 32 and 32' are formed on both sides of the insulating sheet 31.

In this embodiment, two sheet coils shown in FIGS. 4 and 5 are used for each phase of the motor. That is, as shown in FIG. 7, the back sides of the sheet coils 41 and 42 shown in FIGS. 4 and 5, that is, the coils ₃₁ to ₃₈ , are arranged to face each other, and there is, for example, a surface between them. The outer end 4 of the coil ₁₈ , which is the end of winding of the sheet coil 41, is coated with an insulating film or overlapped with an insulating sheet.
9 is connected to the outer end 49 of the corresponding coil ₁₈ of the sheet coil 42. Therefore, the sheet coils 41, 4
The coils 1 ₁ to 1 ₈ and 3 ₁ to 3 ₈ of No. 2 are connected in series with each other, and the front and back sides of the sheet coils 41 and 42 are reversed, and the input and output ends of the current are also reversed. , the magnetic fluxes generated by the corresponding four stacked coils add to each other.

In this way, a laminated sheet coil 43 is constructed by stacking the sheet coils 41 and 42 and connecting the coils in series, and this is provided for each phase of the coil. That is, as shown in FIG. 8, a first phase laminated sheet coil 43a, a second phase laminated sheet coil 43b, and a third laminated sheet coil 43c are provided, and these are sequentially shifted angularly by 120 degrees with respect to the center point 33. Lay them out and stack them on top of each other. In this case, as a matter of course, the coils are laminated with an insulating coating or an insulating sheet interposed therebetween so that the coils do not come into contact with each other.

Furthermore, as shown as a sheet coil 44 in FIG. 8, a speed detection coil and a drive coil each formed thereon are further laminated on these laminated sheet coils.

As shown in FIG.
A coil 45a is formed corresponding to the coil 1 _{8 of} the laminated coil 43b, and coils 45b ₂ and 45b ₁ are formed at positions facing the coils 1 ₄ and 1 ₈ of the laminated coil 43b, _respectively . Coils 45c ₂ and 45c ₁ are formed at positions facing each other. Furthermore, connection pieces 36a ₁ , 36a ₂ , 37b ₁ , 37
b ₂ to 36c ₁ , 36c ₂ , 37c ₁ , and 37c ₂ are formed, respectively. In this case, unlike the previous adhesive piece for the laminated coil, the connecting pieces 36a ₁ 37a ₁ are connected to each other by the connecting part 47a, and similarly the connecting piece 3
6b ₂ and 37b ₂ are connected to the connection piece 36 by the connection part 47b.
c ₁ and 37c ₁ are connected to each other by a connecting portion 47c. The inner ends of the coils 45a ₂ , 45b ₂ , 45c ₂ are led out through the insulating sheet 31 to the back side, that is, the speed detection coil formation surface, and are connected to each other through wiring 48 formed on the back side as shown in FIG. One end 51 of the wiring 48 is connected to a connecting portion 52 passing through the insulating sheet 31, led out to the drive coil side, and then connected to a common terminal, that is, a neutral point terminal 53d.

The first phase terminal 53 provided in parallel with the terminal 53d
a reaches the back side through the connecting part 55 at its inner end,
A wiring 57 is passed through the back side connection part 56, and then comes out from the connection part 58 to the front side and connected to the connection piece _37a2 .
This connecting piece _37a2 is the outer end 46 of the coil ₁₁ of the second layer sheet coil 42 of the first phase laminated coil 43a.
connected to. Coil 1 of this second layer sheet 42
The outer end 49 of ₈ is the connecting piece 36a ₂ is the sheet coil 44
The first layer sheet coil 41 of the first phase laminated coil 43a is further connected through the connection pieces 37a ₁ , 47a, 36a _{1 of}
is connected to the outer end 46 of the coil 1 ₁ through the connecting piece 36a ₁ . Coil 1 of this sheet coil 41 ₈
The outer end 49 of is connected to the connecting piece 36a ₂ of the sheet coil 44 through the connecting piece 46a ₂ . Therefore, the current supplied from the terminal 53a is supplied to the coil 1 ₁ of the sheet coil 42 of the laminated coil 43a, and the current sequentially flows through each coil of the sheet coil 42.
Furthermore, the current flows from the outer end of the coil 1 ₈ of the sheet coil 42 to the outer end of the coil 1 ₁ of the sheet coil 41 through the connecting portion 47a, and the current flows through the coils of the sheet coil 41 in sequence, and from the outer end 49 of the coil 1 ₈ . It reaches the outer end of the coil 45a of the sheet coil 44, flows through this coil toward the inner end, and from there flows to the neutral point terminal 53d.

The connection between the connection pieces of the laminated sheet is, for example, the 11th
This is done as shown in the figure. This FIG. 11 shows the first layer sheet coil 41 of the first phase laminated coil 43a.
This is a case where the connecting piece 36a ₁ on the sheet coil sheet 44 is connected to the connecting piece 36a on the sheet coil sheet 44. Each laminated coil and sheet coil are laminated with an insulating film 61 interposed between them. Connection pieces 36a 1 ' _{, 36} of each laminated coil in the lamination direction correspond to connection piece 36a ₁ of sheet coil 41 of laminated coil 43a.
a ₂ ′, 36a ₂ , 36c ₂ . . . are opposed to each other through insulating sheets in order, and these connection pieces are located in contact with the edges of each insulating sheet 31, and the insulating sheets 31 and 61 are It is extremely thin, and the thickness of the connecting piece is generally considered to be greater. A connection conductor layer 62 such as solder or conductive adhesive is applied to the laminated side surfaces of these connection pieces. The conductive layer 62 is adhered and held between adjacent connecting pieces across the thin insulating sheet 31 or 61. In this way, the connecting piece 36a ₁ of the sheet coil 41 of the laminated coil 43a is connected to the connecting piece 36a of the sheet coil 44 through the conductor layer 62.

Note that after the laminated coils 43a to 43c and the sheet coil 44 are laminated and bonded and solidified, the laminated coils are cut into a predetermined shape, and the cross section of the cut connection piece is compared with the conductor layer 62. Deposition takes place.

In FIG. 9, the outer end of the coil 45b is led out to the back side from the connecting portion 64 through the inner wiring 63, and connected to the inner end of the coil 45b ₁ through the conductor 68 on the back side. The outer end of this coil _45b1 is connected to the coil ₁₈ of the first layer sheet coil ₄₁ of the second layer laminated coil through the connection piece 47b1.
Connected through _A2 . Further, a terminal 53b for the second phase coil is provided almost parallel between the terminals 53d and 53a, and this terminal 53a is connected to the connecting piece _36b1 , which connects the second phase coil 43b to the second phase coil 43b.
Connection piece 36a ₁ for coil 1 ₁ on sheet coil
connected to. Therefore, the current from the terminal 53b flows through the coil of the second layer sheet coil of the laminated coil 43b, the current flows through the coil of the first layer sheet coil, and then passes through the coils 45b ₁ and 45b ₂ to become neutral. The current flows to the point terminal 53d.

The outer end of the coil _45c2 on the sheet coil 44 is led to the back side through the connection part 69, and from this the wiring 7
1 to the inner end of the coil 45c ₁ . The outer end of the coil 45c ₁ is connected to the connecting piece 36c ₂ , and from this to the outer end of the coil ₁₈ of the first layer sheet coil of the third phase laminated sheet coil 43c. On the other hand, a terminal 35c provided in parallel with the terminal 53d is connected to a connecting piece 37c, which is connected to the coil 1 ₁ of the first layer sheet coil of the third phase laminated coil 43c. In this way, the third phase laminated coil 43
The coil c and the coils 45c ₁ and 45c ₂ are connected in series, and a current is passed between the terminals 53c and 53d.

As shown in FIG. 10, the speed detection coil has connection pieces 36a _{1 ′, 36a 2 ′, etc. formed in the same way as the connection pieces 36a 1 , 36a 2} , etc. of the drive coil on the front side, and is formed around them. Wires 57 and 71 mentioned earlier
A speed detection coil 73 is formed on the outside thereof in a zigzag manner in the radial direction with respect to the center point 33, and the conductor portion in the radial direction effectively functions as speed detection. Both ends of this coil 73 are led out as terminals 74 and 75, and each part of these ends is the same.

In each part of the sheet coil 44, the drive coil on the front side and the speed detection coil 73 on the back side, the strength of the sheet coil is weak in the parts where they do not overlap each other with the insulating sheet 31 in between, especially in the parts where they do not cross and overlap. Become. Therefore, this sheet coil is reinforced by appropriately forming a reinforcing conductor 76 extending in the circumferential direction so as to intersect with the speed detection coil 73 on the back side when viewed from the same side, between adjacent drive coils. I can do it. Similarly, a reinforcing coil 77 can be formed along the inner peripheral surface of the speed detection coil 73 in the circumferential direction.

As described above, according to the laminated wiring body of this invention, the pattern conductor on the insulating sheet, for example, in the example of FIG.
Similarly, connecting pieces 36a1 of the sheet coils 44 are provided at corresponding positions, and the connecting pieces ₃₆ of the sheet coils 43a to be connected are extended at _6a1 .
Each insulating sheet sandwiched between a ₁ and the connecting piece 36a ₁ of the sheet coil 44 has connecting pieces 36a ₁ ′, 36 that are not connected to the pattern conductor of that insulating sheet.
b ₂ ′, 36c ₁ ′, etc. are formed, and these are formed up to the edges of the insulating sheet, and since this insulating sheet is thin and the connection piece is thicker than this sheet, the thickness of the laminate is When the conductor layer 62 is formed on the edge, the conductor layer 62 is continuously formed by connecting the adjacent conductors over the insulating sheet, and the conductor layer 62 is strongly fixed to the laminate. Therefore, as described with reference to FIG. 1, there is no need to lead out the terminals for connection to the outside, and the overall space occupied can be small and the device can be constructed in a compact size.

The configuration of this connection piece is preferably such that the sheet coils are solidified as a laminate, and then the portions to be connected are cut in the thickness direction, and the conductor layer 62 is formed on the cut surface.
In addition, in order to more reliably attach the conductor layer 62 to the laminate, for example, as shown in FIG.
A wedge-shaped recess 96 is formed on the circumferential surface of the laminate, or an arc-shaped recess 96 is formed as shown in FIG. 12B, or a wave-shaped recess 96 is formed as shown in FIG. 12C. The conductor layer 6 is formed in these recesses 96.
2 can also be embedded.

In the above, this idea was applied to a stack of sheet coils, but in general, not only the coil but also the pattern conductor is formed on an insulating sheet, and the conductor on the insulating sheet is It can be applied when connecting patterns to each other.

As previously described in Figure 6, forming conductive foil on both sides of an insulating sheet and forming a patterned coil on the conductive foil by etching, etc. The method shown in FIG. 6 is not limited to the method shown in FIG.
As shown in FIG. 3, a double-sided adhesive tape 79 is fed out from a roller 78, and, for example, conductive foils 83 and 84 are fed out from rollers 81 and 82, respectively. Conductor foil 8 on both sides
3 and 84 are superimposed and heated and bonded to each other. This heating can be performed, for example, by steam, and if necessary, the bonded and sent-out laminate is cooled by a cooling means 86. , cut into a predetermined length by a cutter 87.

For example, as shown in FIG. 14, the double-sided adhesive tape 79 has an adhesive layer 89 attached to both sides of an insulator 88, and a release sheet 91 attached to one side of the adhesive layer 89. In this state, the double-sided adhesive tape 79 is wound around the roll 78. When the release sheet 91 is pulled out from this, the release sheet 91 is wound up on a winding roll 92. The insulating sheet 88 is made of a material that does not soften at the maximum temperature that the sheet coil 31 is exposed to, such as polyester resin, polyurethane resin, polyamide resin, polyimide resin, phenol resin, polypropylene resin, polycarbonate resin, fibers of these resins, glass, etc. It is a paper-like sheet made from fibers, etc., and has a thickness of, for example, about 5 μm. The adhesive 89 softens or dissolves when heated and then hardens. For example, the adhesive 89 is solid at room temperature or has a sufficiently high viscosity, such as polyester-modified epoxy resin, phenol resin, phenol-modified epoxy resin, silicone resin, silicone-modified epoxy resin, etc. Resin that has been cured to the B stage, that is, a thermosetting resin that has not yet reached its final cure but is partially cured.
It is formed to a thickness of about 5μ. The release sheet 91 may be a film made of polyethylene, silicone resin, polytetrafluoroethylene, or the like, or a paper coated with resin. Note that instead of using such a double-sided adhesive film, an adhesive may be applied to a simple insulating film and before superimposing it on the conductor foil. In any case, the thickness of the insulating sheet 31 is 30 μm or less, preferably about 5 μm to 12 μm, and the thickness of the insulating sheet 31 is thinner than the thickness of the conductor of the coil attached thereto.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional laminated sheet coil, Figure 2 is a sectional view showing an axial flux motor, Figure 3 is a diagram showing the relationship between the coil and magnetic poles, and Figure 4 is a small motor. A plan view showing one side of the drive coil portion of the coil, FIG. 5 is a rear view thereof,
Fig. 6 is a diagram showing the process for forming an insulating sheet on conductor foil, Fig. 7 is an explanatory exploded view of a laminated coil,
FIG. 8 is an exploded perspective view showing an example of a sheet coil for a small motor, FIG. 9 is a plan view showing the surface of the sheet coil 44 on the drive coil side, and FIG. 10 is a surface of the sheet coil 44 on the speed detection coil side. A plan view showing
Fig. 11 is a cross-sectional view for explaining the connection between laminated coils showing one embodiment of this invention, Fig. 12 is a perspective view showing a partial modification of the laminated wiring body of this invention, and Fig. 13 is a sheet FIG. 14, which is a diagram showing another example of forming a conductive foil, is a sectional view showing the double-sided adhesive sheet. 1 ₁ to 1 ₈ , 3 ₁ to 3 ₈ , 45a, 45b ₁ , 4
5b ₂ , 45c ₁ , 45c ₂ : Drive coil as pattern conductor, 31 : Insulating sheet, 36a ₁ to 36c ₁ ,
36a ₂ ~ 36c ₂ , 37a ₁ ~ 37c ₁ , 37a ₂ ~ 37
c ₂ : Connection piece, 62: Conductor layer.

Claims (1)

[Claims for Utility Model Registration] 1. A patterned conductor is formed on an insulating sheet that is thinner than the thickness thereof, and at least three or more of the insulating sheets are laminated to form a laminate, and the insulating sheet has a laminate near the edge of each of the insulating sheets. When reaching the edge, connection pieces having the same thickness as the pattern conductor are sequentially formed facing each other with insulating sheets interposed therebetween, and a conductor layer is continuously formed over all the connection pieces and the edges of all the insulating sheets. , among the plurality of insulating sheets, only in some of the insulating sheets on which patterned conductors to be connected to each other are formed, the patterned conductors and connection pieces are connected to each other, and the patterned conductors on different insulating sheets are connected to the above-mentioned conductors. A laminated wiring body in which required connections are made through layers. 2. The laminated wiring body according to claim 1 of the utility model registration claim, wherein the stacked portion of the connecting pieces has a recessed portion along the stacking direction formed at the peripheral edge thereof, and the conductive layer is embedded in the recessed portion. .