JP2003068546A - Rotary transformer and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary transformer that is stable and has an excellent yield and a structure that can be manufactured for a shorter lead time than before, and to provide a method for manufacturing the rotary transformer. SOLUTION: In a rotary transformer 1, a rotor 10 and a stator 20 are arranged so that a rotor-side core 12 and a stator-side core 22 are opposite each other, coils 14 and 24 are wound in a coil groove that is formed on a surface at a side opposite to a mutually opposite surface of the rotor- and stator-side cores 12 and 22, and a signal is transmitted and received between the rotor- and stator-side cores 12 and 22 by electromagnetic induction. Additionally, the coil groove is formed on the surface at the side opposite to the mutually opposite surface of the rotor- and stator-side cores 12 and 22, the coils 14 and 24 are wound into the coil groove, and the rotor 10 and stator 20 are assembled so that the rotor- and stator-side cores 12 and 22 are opposite to each other, thus manufacturing the rotary transformer 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary transformer in which a rotor-side core and a stator-side core each having a coil wound around each other are opposed to each other, and signals are transmitted and received between the cores by electromagnetic induction, and a manufacturing method thereof. Involved in

[0002]

2. Description of the Related Art A VCR (Video Cassette Recorder) device for business use is equipped with a head drum section consisting of a rotary drum having a magnetic head attached and a fixed drum. , A rotary transformer is incorporated. This rotary transformer is configured by incorporating a rotary drum side portion, that is, a rotor and a fixed drum side portion, that is, a stator, so as to face each other.

FIG. 11 is a schematic sectional view of a rotary transformer.
Shown in. This rotary transformer 51 is a rotor 60
And the stator 70 are assembled so as to face each other.

The rotor 60 is a flange 6 for the rotor.
1, the rotary cores 62 and the short ring-shaped spacers (spacers) 63 are alternately assembled. A hole 61A that vertically penetrates is formed near the central axis of the flange 61. In the stator 70, a rotary flange 72 and short ring-shaped spacers (spacers) 73 are alternately incorporated in a stator flange 71. The bottom surface of the flange 71 has an opening 71A.

Ferrite, for example, is used as a material for the rotary cores 62 and 72 of the rotor 60 and the stator 70. The ferrite (soft ferrite) used for these cores (rotary cores) 62 and 72 is mainly made of Fe ₂ O ₃ and further MnO · NiO · CuO · ZnO.
It is manufactured by mixing auxiliary raw materials such as

A coil groove is formed in each of the core 62 of the rotor 60 and the core 72 of the stator 70, and coils 64 and 74 made of a wire are wound so as to be embedded in the coil grooves.

Usually, the coil groove of the core 62 of the rotor 60 is formed on the outer peripheral surface of the ring-shaped core 62, and the coil groove of the core 72 of the stator 70 is formed on the inner peripheral surface of the ring-shaped core 72. That is, coil grooves are formed on the surfaces of the rotor 60 and the stator 70, which face each other.

By the way, the rotor 60 and the stator 7
No. 0 flanges 61, 71, rotary cores 62, 72
When alternately assembling the spacers (spacers) 63, 73, a regulating assembly jig is used.

12A and 12B are schematic diagrams showing the construction of a conventional assembly jig for regulation. Assembly jig 65 for rotor
12A, as shown in FIG. 12A,
6 attach a centering rod 67 with a thin circular cross section to the screw 6
It is configured to be fixed at 8. As shown in FIG. 12B, the assembly jig 75 for the stator uses a flat plate-shaped flange receiving base 76, a thick substantially columnar centering rod 77, and a cylindrical member 78 that regulates the outside with screws 79. It is fixedly configured.

The rotor 60 is assembled as follows. First, as shown in the sectional view of FIG. 13A and the enlarged sectional view of FIG. 13B, the coil 64 is wound in the coil groove 62A of the rotary core 62, and the coil 64 is fixed with an adhesive, for example, an instant adhesive. Next, as shown in FIG. 14, the rotary core 62 is attached to the flange 61 for the rotor 60.
The spacer 63 and the rotary core 62 are assembled in this order. Then, as shown in FIG. 15, the rotary core 62 and the spacer 63 are temporarily fixed.

Subsequently, as shown in FIG. 16, the flange 6
The assembly jig 65 shown in FIG. 12A is inserted into the hole 61A penetrating the vicinity of the central axis of 1. Then, as shown in FIG. 17, the upper tightening screw 69 is tightened to fix the tip of the centering rod 67 of the assembly jig 65 to the upper portion of the flange 61. Next, as shown in FIG. 18, the core outer diameter regulating jig 5
1 is inserted to cover the rotary core 62 and the spacer 63. After the outer diameter of the rotary core 62 is regulated by the core outer diameter regulation jig 51, a designated (predetermined) adhesive is applied. Leave for 3 to 5 minutes, depending on the application of the adhesive.
As the adhesive at this time, an adhesive having a high adhesive strength, which cures relatively slowly, is used.

Next, in order to reduce the variation in the bonding position of the rotary core 62 by removing the core outer diameter regulating jig 51 and the assembly jig 65, as shown in FIG. 19A, the outer surface of the rotary core 62 is processed by a dedicated processing machine. 52 grinding wheel 53
To process. This processing reduces the variation in the position of the rotary core 62 as shown in FIG. 19B. The processing amount is, for example, about 0.1 mm. By this processing, for example, the roundness before processing (FIG. 19A) is 0.04 mm.
However, the roundness after processing (FIG. 19B) is 0.0
It will be about 1 mm.

On the other hand, the stator 70 is assembled as follows. The procedure of assembling is generally the same as that of the rotor 60. First, as shown in FIGS. 20A and 20B, the coil 74 is wound in the coil groove 72A of the rotary core 72, and the coil is fixed with an adhesive, for example, an instant adhesive. Next, as shown in FIG. 21, the rotary core 72, the spacer 73, and the rotary core 72 are assembled in the flange 71 for the stator 70 in this order. Then, as shown in FIG. 22, the rotary core 72 and the spacer 73 are temporarily fixed.

Subsequently, as shown in FIG. 23, the flange 7
The assembly jig 75 shown in FIG. Then, as shown in FIG. 24, the upper tightening screw 80 is tightened to fix the tip portion of the centering rod 77 of the assembly jig 75 to the upper portion of the flange 71. The outer side of the flange is supported by a cylindrical member 78, and the inner diameter of the rotary core 72 is regulated by the center output rod 77. Then, a designated (predetermined) adhesive is applied. Leave for 3 to 5 minutes, depending on the application of the adhesive. As the adhesive at this time, an adhesive having a high adhesive strength, which cures relatively slowly, is used.

Next, the stator 70 is taken out of the assembly jig 75, and the inner surface of the rotary core 72 is processed by a dedicated processing machine 54 as shown in FIG. 25A in order to reduce variations in the bonding position of the rotary core 72. Processing is performed using the grinding wheel 55. This processing reduces the variation in the position of the rotary core 72 as shown in FIG. 25B. The processing amount is, for example, about 0.1 mm. By this processing, for example, the roundness before processing (FIG. 25A) is 0.04 mm.
However, the roundness after processing (Fig. 25B) is 0.0
It will be about 1 mm.

[0016]

However, in the above-described rotary transformer 50, both the rotor assembly jig 65 and the stator assembly jig 75 used during assembly have the centering rods 67 and 77. Screw 6
The structure is such that it is fixed to the flange pedestals 66 and 76 by 8, 79. Therefore, due to loosening of the screws 68 and 79, the roundness accuracy of the product deteriorates over time, and the quality of the rotary transformer 50 becomes unstable. As a result, it is necessary to correct (position) the assembly jigs 65 and 75 in a cycle of about 3 months, for example.

Therefore, as shown in FIGS. 19A and 25A, after assembling the rotor 60 and the stator 70, it is necessary to further process by the processing machines 52 and 54 to stabilize the accuracy of the product. For this reason, the lead time becomes longer and the number of steps increases as the fabrication process is further performed. In addition, the manufacturing cost increases due to the processing cost.

In the structure of the rotary transformer 50 described above, as shown in the cross-sectional view of FIG. 26, due to variations in the winding method of the coils 64 and 74 and variations in the adhesive force of the adhesive agent that fixes the coils 64 and 74. The coils 64 and 74 may protrude from the coil grooves 62A and 72A of the rotary cores 62 and 72.

In this way, the coils 64 and 74 are arranged in the coil groove 6
If the coils are left outside the 2A and 72A, the coils 64 and 74 may be damaged or insulation failure may occur due to the contact with the opposing rotary cores 72 and 62. Therefore, the coils 64 and 74 are pushed in by the working tool so that the coils 64 and 74 do not protrude from the coil grooves 62A and 72A.
4 may be broken. As a result, when the rotary transformer 50 is manufactured, defective products are generated and the manufacturing yield is deteriorated.

Further, the coils 64 and 74 are wound on the rotary cores 62 and 72, and the portions protruding from the coil grooves 62A and 72A are pushed in by a working tool, and then the coils 64 and 74 are completely adhered by using an instant adhesive. I am trying to fix it. As described above, since the instant adhesive is used to fix the coils 64 and 74, it takes a cleaning time to remove the excess adhesive. The lead time becomes long because the number of man-hours required for the visual inspection in each of the above-mentioned steps is long.

In order to solve the above-mentioned problems, the present invention provides a rotary transformer having a stable yield and a structure which can be manufactured with a shorter lead time than the conventional one. Further, the present invention provides a method for manufacturing a rotary transformer, which can stably manufacture the rotary transformer with a good yield and a shorter lead time than conventional ones.

[0022]

According to the rotary transformer of the present invention, the rotor and the stator are arranged so that the rotor side core and the stator side core around which the coils are wound face each other, and the rotor side core is formed by electromagnetic induction. Signals are transmitted and received between the stator side core and the stator side core, and the rotor side core and the stator side core each have a coil groove formed on the surface opposite to the surface where the rotor side core and the stator side core face each other. Then, the coil is wound in the coil groove.

According to the above-described structure of the rotary transformer of the present invention, the rotor-side core and the stator-side core have coil grooves formed on the surfaces opposite to the surfaces on which the rotor-side core and the stator-side core face each other. As a result, the coil wound in the coil groove does not face the surface where the rotor-side core and the stator-side core face each other (the rubbing surface between the rotor and the stator). This prevents the coil from contacting the opposing core.

According to the method of manufacturing a rotary transformer of the present invention, the rotor and the stator are arranged so that the rotor side core and the stator side core around which the coil is wound face each other, and the rotor side core and the stator side are arranged by electromagnetic induction. When manufacturing a rotary transformer in which signals are transmitted and received between cores, a coil groove is formed on the surface opposite to the surface on which the cores face each other with respect to the rotor-side core and the stator-side core. A coil is wound in the coil groove of each core, and the rotor and the stator are assembled so that the rotor-side core and the stator-side core face each other.

According to the above-described method of manufacturing a rotary transformer of the present invention, the rotor side core and the stator side core are formed with coil grooves on the surface opposite to the surface on which the cores face each other. A coil is wound in the coil groove of each core, and the rotor and the stator are assembled so that the rotor-side core and the stator-side core face each other. It is possible to form a rotary transformer having a structure in which the stator-side core does not face the facing surfaces (the rubbing surface of the rotor and the stator) so that the coils do not come into contact with the facing cores.

According to the method of manufacturing a rotary transformer of the present invention, a cylindrical unit rotor side core and a cylindrical unit stator side core, which are divided for each coil corresponding to a predetermined channel, are overlapped and integrally joined to a flange. A rotary transformer in which a rotor and a stator formed by slicing are arranged so that an inner rotor and an outer stator face each other with a common central axis, and signals are transmitted and received between the rotor-side core and the stator-side core by electromagnetic induction. During manufacturing, each unit rotor side core is placed on the rotor flange, and a cylindrical part with an outer diameter that fits in the center hole of the rotor flange is press-fitted vertically into a plate-shaped part. Use the rotor assembly jig whose surfaces have been polished, and then attach the rotor assembly jig to the rotor flange. At the same time as assembling, cover the rotor flange and the outside of the assembly jig with a cylindrical part having an inside diameter that fits the outside diameter of the rotor side core, fix the unit rotor side core from the outside, and bond the unit rotor side cores together. The rotor is formed by joining with the agent,
Each unit stator-side core is placed on the stator flange, and a cylindrical part that fits within the inner diameter of the stator-side core is press-fitted vertically into the plate-shaped part to polish the surface of the plate-shaped part. Using the assembly jig for the stator and the cylindrical part that can be fitted to the outside of the flange of the stator, the assembly jig for the stator and the cylindrical part and the flange of the stator are assembled to form the core on the unit stator side. Is fixed from the inside, and the stator is formed by joining the unit stator side cores with an adhesive, and the rotor and stator are combined so that the unit rotor side cores and the unit stator side cores face each other to form a rotary transformer. To form.

According to the above-described method of manufacturing a rotary transformer of the present invention, each unit rotor-side core is arranged on the flange of the rotor, and a cylindrical component having an outer diameter fitted to the center hole of the flange of the rotor is formed into a plate. The rotor assembly jig is assembled with the rotor flange by using the rotor assembly jig in which the surface of the plate-shaped component is polished by vertical press-fitting into the plate-shaped component. The plate-shaped part of the rotor assembly jig is ground by covering the outer surface of the rotor flange and the assembly jig with a cylindrical part having an inside diameter that can be fitted to the unit rotor side core. The outer surface and the cylindrical parts are formed with high precision. Assemble this rotor assembly jig with the rotor flange to cover the cylindrical parts from the outside. More can be arranged with high precision by regulating the unit rotor-side core. Also, each unit stator side core is placed on the flange of the stator, and a cylindrical part that fits into the inner diameter of the stator side core is press-fitted vertically into the plate part, and the surface of the plate part is polished. Using the machined assembly jig for the stator and a cylindrical part that can be fitted to the outside of the flange of the stator, the assembly jig for the stator and the cylindrical part and the flange of the stator are assembled to form a unit stator. By fixing the side cores from the inside, the polished surface of the plate-shaped component of the stator assembly jig and the columnar component are formed with high accuracy, and the stator assembly jig and the cylindrical component are formed. By assembling the stator and the flange of the stator, each unit stator side core can be regulated and arranged with high accuracy.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a rotor and a stator are arranged such that a rotor side core and a stator side core, each having a coil wound around them, face each other. The rotor-side core and the stator-side core each have a coil groove formed on the surface opposite to the surface on which the rotor-side core and the stator-side core face each other. It is a rotary transformer in which a coil is wound in a groove.

According to the present invention, the rotor and the stator are arranged such that the rotor side core and the stator side core each having a coil wound around each other face each other, and signals are transmitted and received between the rotor side core and the stator side core by electromagnetic induction. A method for manufacturing a rotary transformer in which a coil groove is formed on a surface of a rotor-side core and a stator-side core opposite to a surface on which the cores face each other, and a coil of each core is formed. This is a method for manufacturing a rotary transformer in which a coil is wound in a groove and the rotor and the stator are assembled so that the rotor-side core and the stator-side core face each other.

According to the present invention, a rotor and a stator are formed by stacking a cylindrical unit rotor side core and a cylindrical unit stator side core, which are divided for each coil corresponding to a predetermined channel, and joining them to a flange so as to be integrated. But,
A method of manufacturing a rotary transformer in which a central axis is common, an inner rotor and an outer stator are arranged to face each other, and signals are transmitted and received between a rotor-side core and a stator-side core by electromagnetic induction, Each unit rotor side core is placed on the rotor flange, and the surface of the plate-shaped component is formed by vertically press-fitting a cylindrical component with an outer diameter that fits in the center hole of the rotor flange into the plate-shaped component. Using a ground rotor assembly jig, assemble the rotor assembly jig with the rotor flange, and also assemble the rotor flange with a cylindrical part with an inner diameter that fits the outer diameter of the rotor core. By covering the unit rotor side core from the outside by covering it on the outside of the jig, and joining the unit rotor side cores with an adhesive, the rotor Is formed by arranging each unit stator-side core on the flange of the stator, and press-fitting a cylindrical component vertically into a plate-shaped component so that it fits into the inner diameter of the stator-side core. Using a ground stator assembly jig and a cylindrical part that can be fitted to the outside of the stator flange, assemble the stator assembly jig and cylindrical part with the stator flange. The unit stator side core is fixed from the inside, the unit stator side cores are joined together with an adhesive to form a stator, and rotors and stators are combined so that the unit rotor side cores and the unit stator side cores face each other. It is a method of manufacturing a rotary transformer in which a rotary transformer is formed.

Further, according to the present invention, in the method of manufacturing a rotary transformer, the cylindrical parts of the respective assembly jigs are displaced by 5 μm or less from a line perpendicular to the flat plate parts.

Further, according to the present invention, in the method of manufacturing a rotary transformer, the polishing accuracy of the surface of the flat plate-shaped component of each assembly jig is ∇∇∇ or higher.

FIG. 1 is a schematic sectional view of a rotary transformer as an embodiment of the present invention. The rotary transformer 1 is configured by incorporating a rotor 10 and a stator 20 so as to face each other with a common central axis.

This rotary transformer 1 is, for example, a VC
In the head drum portion composed of the R rotary drum and the fixed drum, it is used as a transducer for transmitting signals and electric power in a non-contact manner between the rotary drum and the VCR main body (amplifier etc.). Then, the rotor 10 is attached to the rotating drum, and the stator 20 is attached to the fixed drum.

The rotor 10 is a flange 1 for the rotor.
1, a plurality of rotary cores 12 as unit cores and short ring-shaped spacers (spacers) 13 are alternately incorporated. A hole 11A that vertically penetrates is formed near the central axis of the flange 11. The stator 20 is
The flange 21 for the stator has a rotary core 22 as a unit core and a spacer (spacer) in the form of a short ring.
23 and 23 are incorporated alternately. The bottom surface side of the flange 21 has an opening 21A. Then, signals can be transmitted and received between the rotary cores 12 and 22 of the rotor 10 and the stator 20 facing each other by electromagnetic induction.

The rotary cores 12 and 22 of the rotor 10 and the stator 20 are made of ferrite, for example. The ferrite (soft ferrite) used for these cores (rotary cores) 12 and 22 is mainly composed of Fe ₂ O ₃ and further contains MnO / NiO / CuO / ZnO.
It is manufactured by mixing auxiliary raw materials such as

The spacers (spacers) 13 and 23 are
For example, a non-magnetic conductive material such as brass is used.

Then, the rotary core 1 of the rotor 10
2 and coil grooves 12A and 22A (see FIG. 2 and FIG. 4) are formed in the rotary core 22 of the stator 20, respectively, so that the coils 14 and 24 made of wire are embedded in the coil grooves 12A and 22A. It is wound.

Surfaces (rotation surfaces) where the rotary cores 12 and 22 of the rotor 10 and the stator 20 face each other.
The gap is set to, for example, about 50 μm.

In this embodiment, in particular, the coil grooves 12 are formed on the surfaces of the rotor 10 and the stator 20 opposite to the surfaces on which the rotary cores 12 and 22 face each other.
A and 22A are formed. That is, the coil groove 12A of the rotary core 12 on the rotor 10 side is the ring-shaped core 1
The coil groove 22 </ b> A of the rotary core 22 on the side of the stator 20 is formed on the outer peripheral surface of the ring-shaped core 22.

As for the rotary core 12 of the rotor 10, as shown in the sectional view of FIG. 2A and the enlarged sectional view of FIG. 2B, the coil is formed in the coil groove 12A formed on the inner peripheral surface of the rotary ring 12 having a short ring shape. Winding 14
The coil 14 is fixed with an adhesive such as an instant adhesive.
Next, as shown in FIG. 3, the flange 1 for the rotor 10
1 is assembled in the order of the rotary core 12, the spacer 13 and the rotary core 12, and the rotary core 12 and the spacer 13 are temporarily fixed. After that, the rotor 10 can be assembled using the assembly jig as in the conventional case.

On the other hand, the rotary core 2 of the stator 20
As for No. 2, as shown in the sectional view of FIG. 4A and the enlarged sectional view of FIG.
The coil 24 is wound in the coil groove 22A formed on the outer peripheral surface of the coil, and the coil 24 is fixed with an adhesive, for example, an instant adhesive. Next, as shown in FIG. 5, the rotary core 22 → the spacer 23 → the rotary core 22 are assembled in the flange 21 for the stator 20 in this order, and the rotary core 22 and the spacer 23 are temporarily fixed. After that, the stator 20 can be assembled using the assembly jig as in the conventional case.

In the stator 20, although not shown, the lead wire of the coil 24 of each rotary core 22 is extended to the outside of the rotary core 22 (flange 21 side) to form a lead wiring. Similarly, in the rotor 10, although not shown, the lead wire of the coil 14 of each rotary core 12 is extended to the inner side of the rotary core 12 (flange 11 side) to form a lead wiring.

Since coil grooves 12A and 22A are formed on the surfaces of the rotor 10 and the stator 20 opposite to the surfaces on which the rotary cores 12 and 22 face each other, the enlarged cross-sectional view of FIG. As shown, the coil 14,
24 does not face the surfaces of the rotor 10 and the stator 20 where the rotary cores 12 and 22 face each other,
It is arranged on the side away from each other. Thereby, if the coils 14 and 24 are arranged in the coil grooves 12 of the rotary cores 12 and 22,
Even if it protrudes beyond A and 22A, it does not come into contact with the opposing rotary cores 22 and 12. Therefore, it is possible to prevent the coils 14 and 24 from being damaged or having insulation failure due to contact with the opposing rotary cores 22 and 12.

Further, since the coils 14 and 24 are arranged on the surface of the rotary cores 12 and 22 on the side where accuracy is not so demanded, the coil 1 is placed deep inside the coil grooves 12A and 22A.
It is not necessary to force 4,4 and 24, and it is only necessary to press lightly with a work tool, and the coils 14 and 24 are not broken.

Further, even in the case where the rotary cores 12 and 22 are ground with a processing grindstone in order to reduce the variation of the surfaces facing each other, the coils 14 and 24 are mounted on the surfaces to be ground.
Is not exposed, the coils 14 and 24 are located in the coil groove 12A,
Even if it doesn't go all the way to 22A, no problem occurs.

Therefore, the coils 14 and 24 are arranged in the coil groove 12
It is not necessary to inspect whether or not it is inside the A and 22A, and the coils 14 and 2 of the rotary cores 12 and 22
It is possible to omit the step 4 of inspecting the winding state.

Further, conventionally, since the coil groove faces the opposing surfaces (rubbing surfaces) of the rotary core, the instant adhesive for fixing the coil may stick out to the rubbing surface, and the organic solvent The rubbed surface is cleaned with, etc. to remove the protruding adhesive. On the other hand, in the configuration of the rotary transformer 1 of the present embodiment, the coil groove 1 is formed on the mutually facing friction surfaces of the rotary cores 12 and 22.
Since 2A and 22A are not exposed, the instant adhesive for fixing the coils 14 and 24 does not stick out to the rubbing surface. That is, the step of cleaning the rubbing surface can be omitted.

According to the present embodiment described above, the coil 1
Eliminates scratches and insulation failure on coils 4, 24
The disconnection of 4 will not occur. As a result, the production of defective products in the manufacture of the rotary transformer 1 can be reduced, and the manufacturing yield can be improved. Further, since the process of inspecting the winding state of the coils 14 and 24 and the process of cleaning the rubbed surfaces of the rotary cores 12 and 22 are not required and the number of working steps can be reduced, the lead time can be shortened. .

Therefore, according to the present embodiment, the workability can be improved, the quality and the production can be stabilized, and the rotary transformer can be produced at a low cost.

Next, as another embodiment of the present invention, a method of manufacturing the rotary transformer 1 shown in FIG. 1 will be described. The rotary transformer 1 shown in FIG. 1 can be assembled in the same manner as the conventional rotary transformer 50 by using the conventional assembly jigs 65 and 75 shown in FIGS. 12A and 12B. However, when the conventional assembling jigs 65 and 75 are used, a processing step by a processing machine is required as in the conventional case.

Therefore, in the present embodiment, the assembly jig has a structure different from that of the conventional assembly jigs 65 and 75.
The rotary transformer 1 is manufactured (assembled).

First, FIG. 7 shows a schematic configuration diagram of the rotor assembly jig of the present embodiment. 7A shows a side view of the assembly jig, and FIG. 7B shows a sectional view of the assembly jig. As shown in FIGS. 7A and 7B, in this assembly jig 15, a flat plate-shaped flange receiving base 16 is made thicker than in the conventional case, and a thin cylindrical center output rod 17 is press-fitted into a hole formed in the flange receiving base 16. To do. The thin columnar centering rod 17 has an outer diameter that fits into the center hole of the flange 11 of the rotor 10. And the center stick 17
The press-fitted portion of is welded to the upper portion of the flange receiving base 16. Reference numeral 18 in FIG. 7B indicates this welded portion.

The center output rod 17 is attached to the flange pedestal 16
Although the accuracy of the assembly jig 15 can be ensured only by press-fitting into the flange, by welding the centering rod 17 in this manner, the portion press-fitted into the flange receiving base 16 can be prevented from loosening.

Further, the surface (upper surface) 16A of the flange pedestal 16 is polished. At this time, the center stick 17
The welded portion 18 and the welded portion 18 are not polished. That is, for example, while rotating the assembly jig 15, a necessary portion is polished.

If necessary, as shown in FIG. 7C, the back surface (lower surface) 16B of the flange receiving base 16 is subjected to shaving (thinning) processing and polishing processing. In this way, the back surface 16 of the flange pedestal 16 of the assembly jig 15 is
If B is processed, the accuracy can be surely secured.

With respect to this assembly jig 15, it is desirable that the deviation of the centering rod 17 from the line perpendicular to the flange receiving base 16 be within 5 μm.

The surface (upper surface) of the flange receiving base 16
It is desirable that the polishing accuracy of 16A be ▽▽▽ or higher.
That is, with respect to this surface 16A, the maximum roughness Rmax ≦ 6.3.
μm, ten-point average roughness Rz ≦ 6.3 μm, and center line average roughness Ra ≦ 1.6 μm.

Using this assembly jig 15, the rotor 10
Assemble. That is, as shown in FIG.
Then, the rotary core 12 and the spacer 13 are sequentially assembled, and then the centering rod 17 of the assembly jig 15 is attached to the flange 11.
Insert into the center hole (hole penetrating near the center axis). Then, tighten the upper tightening screw 19 to remove the centering rod 1.
The tip of 7 is fixed to the upper part of the flange 11. Further, the outer diameter of each rotary core 12 is regulated by fitting the outer diameter regulating jig 31 onto the outer side of the flange 11 incorporating the rotary core 12 and the outer side of the flange receiving base 16 of the assembling jig 15. To do. The core outer diameter restricting jig 31 is formed in a cylindrical shape having an inner diameter such that it can be fitted to the outer diameter of the rotary core 12. And this state is shown in FIG. After that, a designated (predetermined) adhesive is applied and cured to fix the rotary core 12 to the flange 11. Then, the core outer diameter regulation jig 31 and the assembly jig 15 are removed to complete the rotor 10.

In FIG. 8, since the flange pedestal 16 and the rotary core 12 have substantially the same outer diameter, the inner surface of the core outer diameter regulating jig 31 has a uniform upper and lower surface. When the outer diameter of the flange pedestal 16 is larger, the flange pedestal 1 is provided below the core outer diameter regulating jig 31.
A recess for inserting 6 may be formed.

Further, FIG. 9 shows a schematic configuration diagram of a stator assembly jig of the present embodiment. 9A shows a side view of the assembly jig, and FIG. 9B shows a sectional view of the assembly jig. As shown in FIGS. 9A and 9B, in the assembly jig 25, the flange pedestal 26 is made thicker than the conventional assembly jig 75, and the upper disk having a slightly smaller diameter is formed on the lower disk. It has a plate-like configuration. Further, a thick columnar centering rod 27 is press-fitted into a hole having a slightly large diameter and formed in the center of the flange receiving base 26. The columnar centering rod 27 has an outer diameter such that it can be fitted into the inner diameter of the rotary core 22 of the stator 20. Then, the press-fitted portion of the center ejecting rod 27 is connected to the flange receiving base 2
Weld to the upper disc of 6. Reference numeral 28 in FIG. 9B shows this welded portion.

The center output rod 27 is attached to the flange pedestal 26.
Although the accuracy of the assembly jig 25 can be ensured only by press-fitting into the flange, by welding the centering rod 27 as described above, the portion press-fitted into the flange receiving base 26 can be prevented from loosening.

Further, the surface (upper surface of the upper disk) 26A of the flange pedestal 26 is ground. At this time, the center ejecting rod 27 and its welded portion 28 are not polished. That is, for example, while rotating the assembly jig 25, a necessary portion is polished.

Although not shown, the back surface (lower surface) of the flange pedestal 26 is subjected to shaving (thinning) processing and polishing processing as necessary. By processing the back surface of the flange pedestal 26 of the assembly jig 25 in this way, the accuracy can be reliably ensured.

Also in this assembling jig 25, it is desirable that the deviation of the centering rod 27 from the line perpendicular to the flange receiving base 26 is within 5 μm.

The surface (upper surface) of the flange pedestal 26
It is desirable that the polishing accuracy of 26A be ▽▽▽ or higher.
That is, with respect to this surface 26A, the maximum roughness Rmax ≦ 6.3.
μm, ten-point average roughness Rz ≦ 6.3 μm, and center line average roughness Ra ≦ 1.6 μm.

Using this assembling jig 25, the stator 2
Assemble 0. That is, as shown in FIG. 5, the flange 2
The rotary core 22 and the spacer 23 are sequentially assembled in the inside of 1, and then the centering rod 27 of the assembly jig 25 is inserted into the inside of the flange 21. At this time, the outer side of the flange 21 is supported by being fitted into the cylindrical member 32 so as to surround the upper disk of the flange receiving base 26 of the assembly jig 25 and the flange 21. This cylindrical member 32 is the flange 2
1 and the inner diameter of the upper part of the flange pedestal 26 so that they can be fitted to the outer diameter of the disk. Then, the upper tightening screw 29 is tightened to fix the tip end portion of the center output rod 27 to the upper portion of the flange 21.
The inner diameter of the rotary core 22 is regulated by 7. This state is shown in FIG. After that, a designated (predetermined) adhesive is applied and cured to fix the rotary core 22 to the flange 21. Then, the assembly jig 25 and the cylindrical member 32 are removed to complete the rotor 20.

Although the cylindrical member 32 is fitted in the upper disc of the flange receiving base 26 in FIG. 10, it is not shown in the drawing, but a (ring-shaped) recess is formed in the lower disc of the flange receiving base 26. And the lower end of the cylindrical member 32 may be press-fitted into this recess. By press-fitting the cylindrical member 32 into the recess formed in the flange receiving base 26 in this way, the cylindrical member 32 can also be an assembly jig integrated with the flange receiving base 26, and is more stable. The flange 21 of the stator 20 can be regulated.

According to the present embodiment described above, the rotor 1
Assembly jig 15 for 0 and assembly jig 25 for stator 20
By pressing the center ejecting rods 17 and 27 into the holes of the flange pedestals 16 and 26, respectively, the accuracy of the assembly jigs 15 and 25 changes little over time, and as a result, the rotary core 12 , 22 in the roundness deviation can be suppressed.

Further, each flange receiving base 1 of the assembly jig 15 for the rotor 10 and the assembly jig 25 for the stator 20.
By polishing the surfaces 16A and 26A of 6 and 26, the rotary cores 12 and 22 can be arranged with high accuracy by the flange receiving bases 16 and 26 and the centering rods 17 and 27.

With these assembly jigs 15 and 25, each unit rotary core 1 of the rotor 10 and the stator 20 is
Since the centers of the respective unit rotary cores 12 and 22 can be arranged at the same positions as the centers of the flanges 11 and 21 when the two and 22 are overlapped and fixed in position, the outer diameter of the rotary core 12 of the rotor 10 and Stator 20
The inner diameter of the rotary core 22 can be made closer to a perfect circle.

As a result, it is possible to reduce the rate of defective products during manufacturing due to variations in roundness. Further, since the accuracy of the roundness is ensured, the processing steps by the processing machine or the like after assembling the rotor 10 and the stator 20 are not necessary, and the number of steps is reduced, the lead time of the manufacturing process is shortened, and the manufacturing cost is reduced. Can be reduced.

Further, assembling jigs 15 for polishing the front surface (upper surface) of the flange pedestals 16 and 26 and shaving and polishing the back surface (lower surface) of the flange pedestals 16 and 26.
You only have to do 25, each rotary transformer 1
Since it is not necessary to process the rotor 10 and the stator 20 with a processing machine or the like, the processing cost can be reduced.

Therefore, the rotary transformer 1 of good quality can be manufactured at low cost and with high yield.

Further, the lower surface (back surface) side of the flange receiving bases 16 and 26 of the assembling jigs 15 and 25 is machined to change the accuracy of the assembling jigs 15 and 25 (change over time.
(Deterioration) is further reduced and the accuracy of roundness is less changed.

In this embodiment, the assembly jigs 15 and 25 are manufactured (assembled) into the rotary transformer 1 shown in FIG.
However, the assembling jigs 15 and 25 of the present embodiment can also be used for manufacturing (assembling) rotary transformers having other configurations.

For example, the conventional rotary transformer 50 shown in FIG. 11 can be manufactured by using the assembling jigs 15 and 25 of the present embodiment.
It is possible to reduce the number of steps by omitting the processing steps (FIGS. 19A and 25A) by 2, 54.

The present invention is not limited to the above-mentioned embodiments, and various other configurations can be adopted without departing from the gist of the present invention.

[0079]

According to the present invention described above, the coil groove is formed on the surface opposite to the surface where the rotor-side core and the stator-side core face each other, so that the coil is formed on the rotor-side core and the stator-side. Since the cores do not face the surfaces facing each other, the coils do not come into contact with the facing cores even if they protrude from the coil groove. As a result, it is possible to prevent the coil from being damaged and the insulation from being defective, and to prevent the coil from breaking.

Therefore, the production yield can be improved by reducing the occurrence of defective products, and the number of working steps can be reduced by omitting the step of inspecting the winding state of the coil and the step of cleaning the surface where the rotor and the stator face each other. It is possible to reduce the lead time. That is, according to the present invention, it is possible to improve the workability, stabilize the quality and production, and inexpensively produce the rotary transformer.

According to the present invention described above, the rotor assembling jig and the stator assembling jig are configured such that the cylindrical parts are press-fitted into the plate-like parts, respectively. The change over time can be made very small, and longer time accuracy can be maintained. That is, it is possible to prolong the cycle of the correction timing of the assembly jig and reduce the cost for correction and replacement. Further, by polishing the surface of the plate-shaped component of each assembly jig, it becomes possible to assemble the rotor and stator by arranging each unit rotor-side core and each unit stator-side core with high accuracy. . That is, it is possible to suppress variations in roundness of the rotor side core and the stator side core, for example.

As a result, it is possible to reduce the occurrence rate of defective products during manufacturing due to variations in roundness and maintain stable quality. Further, since the roundness accuracy of each unit rotor-side core and each unit stator-side core is ensured, there is no need for a processing process such as a processing machine after assembling the rotor and the stator, and the number of processes is reduced. The lead time of the manufacturing process can be shortened and the manufacturing cost can be reduced. Further, the processing cost can be reduced.
Therefore, according to the present invention, a rotary transformer of good quality can be manufactured at low cost and with high yield.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram (cross-sectional view) of a rotary transformer according to an embodiment of the present invention.

2 is a cross-sectional view of a rotary core of the rotor of the rotary transformer of FIG. B is an enlarged cross-sectional view of the rotary core of FIG. 2A.

FIG. 3 is a process diagram showing an assembly process of the rotor of FIG.

4A is a sectional view of a rotary core of a stator of the rotary transformer of FIG. 1. FIG. B is an enlarged cross-sectional view of the rotary core of FIG. 4A.

FIG. 5 is a process drawing showing an assembly process of the stator of FIG.

FIG. 6 is an enlarged sectional view of a main part of the rotary transformer of FIG.

FIG. 7 is a view showing an embodiment of a rotor assembly jig used in the manufacturing method of the present invention. It is a side view of an A assembly jig. B is a cross-sectional view of the assembly jig. It is sectional drawing at the time of grind | polishing the bottom face and upper face of a C flange receiving stand.

8 is a cross-sectional view showing a state where the assembly jig shown in FIG. 7 is incorporated in a rotor.

FIG. 9 is a view showing one form of a stator assembly jig used in the manufacturing method of the present invention. It is a side view of an A assembly jig. B is a cross-sectional view of the assembly jig.

10 is a cross-sectional view showing a state where the assembly jig of FIG. 9 is incorporated in a stator.

FIG. 11 is a schematic configuration diagram (cross-sectional view) of a conventional rotary transformer.

FIG. 12 is a side view of a conventional assembly jig for a rotor. B is a side view of a conventional assembly jig for a stator.

FIG. 13 is a sectional view of a rotary core of an A rotor. B is an enlarged sectional view of the rotary core of FIG. 13A.

FIG. 14 is a process diagram showing a conventional rotor assembly process.

FIG. 15 is a process diagram showing a conventional rotor assembling process.

FIG. 16 is a process diagram showing a conventional rotor assembling process.

FIG. 17 is a process diagram showing a conventional rotor assembling process.

FIG. 18 is a process diagram showing a conventional rotor assembling process.

19A and 19B are process diagrams showing a conventional rotor machining process.

FIG. 20 is a cross-sectional view of a rotary core of an A stator. B is an enlarged cross-sectional view of the rotary core of FIG. 20A.

FIG. 21 is a process diagram showing a conventional stator assembly process.

FIG. 22 is a process diagram showing a conventional stator assembly process.

FIG. 23 is a process diagram showing a conventional stator assembly process.

FIG. 24 is a process diagram showing a conventional stator assembly process.

25A and 25B are process diagrams showing a conventional stator machining process.

FIG. 26 is an enlarged cross-sectional view of a main part showing a problem of the conventional rotary transformer.

[Explanation of symbols]

1 rotary transformer, 10 rotors, 11, 21
Flange, 12,22 Rotary core, 13,23
Spacer, 14, 24 coil, 15, 25 assembly jig, 2
0 stator

Claims (5)

[Claims] 1. A rotor and a stator are arranged such that a rotor-side core and a stator-side core each having a coil wound around each other face each other, and signals are transmitted and received between the rotor-side core and the stator-side core by electromagnetic induction. The rotor-side core and the stator-side core each have a coil groove formed on a surface opposite to a surface where the rotor-side core and the stator-side core face each other. A rotary transformer, characterized in that the coil is wound in a coil groove. 2. A rotor and a stator are arranged such that a rotor-side core and a stator-side core each having a coil wound around each other face each other, and signals are transmitted and received between the rotor-side core and the stator-side core by electromagnetic induction. A method for manufacturing a rotary transformer, wherein a coil groove is formed on a surface of the rotor-side core and a surface of the stator-side opposite to a surface on which the cores face each other, and 2. A method for manufacturing a rotary transformer, comprising winding a coil in the coil groove, and assembling the rotor and the stator such that the rotor-side core and the stator-side core face each other. 3. A rotor and a stator formed by stacking a cylindrical unit rotor-side core and a cylindrical unit stator-side core, which are divided for each coil corresponding to a predetermined channel, and joining them to a flange so as to be integrated. A method of manufacturing a rotary transformer in which a central axis is common, an inner rotor and an outer stator are arranged to face each other, and signals are transmitted and received between a rotor-side core and a stator-side core by electromagnetic induction, Each unit rotor-side core is arranged on the flange of the rotor, and a cylindrical part having an outer diameter that is fitted in the center hole of the flange of the rotor is vertically press-fitted into a plate-shaped part. When the rotor assembly jig whose surface is polished is used and the rotor assembly jig is assembled with the rotor flange, , A cylindrical part having an inner diameter fitted to the outer diameter of the rotor side core is placed on the flange of the rotor and the outside of the assembly jig to fix the unit rotor side core from the outside, and the unit rotor side core A rotor is formed by joining them together with an adhesive, and each unit stator-side core is arranged on the flange of the above-mentioned stator, and a cylindrical part that fits within the inner diameter of the stator-side core An assembly jig for a stator, which is formed by press-fitting into the plate-shaped part and whose surface is polished, and a cylindrical part that is fitted to the outside of the flange of the stator, are used to assemble the stator part. The unit and the cylindrical part and the flange of the stator are assembled to fix the unit stator side core from the inside, and the unit stator side cores are connected to each other. A rotary transformer, wherein a stator is formed by joining with a binder, and the rotor and the stator are combined so that the unit rotor-side cores and the unit stator-side cores face each other to form a rotary transformer. Manufacturing method. 4. The cylindrical member of each of the assembly jigs,
The method for manufacturing a rotary transformer according to claim 3, wherein the deviation is within 5 μm from a line perpendicular to each of the flat plate-shaped parts. 5. The method for manufacturing a rotary transformer according to claim 3, wherein the polishing accuracy of the surface of the flat plate-shaped component of each assembly jig is ∇∇∇.