JPH0661064A - Insertion method of coil for rotary transformer and its insertion equipment - Google Patents

Abstract

PURPOSE:To insert a coil into a trench of an outer coil without leaving strain in a coil. CONSTITUTION:A coil 5 molded in a circular type is transformed into an elliptical type or an oblong type. The transformed coil 5 is inserted slantingly to the center axis of an outer core 1 constituting a rotary transformer. The transformed coil 5 is inserted into a trench 2 formed inside the outer core 1 and restored to the initial circular form. Thereby the coil for a rotary transformer is inserted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to, for example, VTRs and Ds.
The present invention relates to a method and an apparatus for inserting a coil mounted on a rotary transformer used in an AT.

[0002]

2. Description of the Related Art Conventionally, the following techniques have been adopted for mounting coils used in rotary transformers. That is, grooves are formed on the inner circumference of the outer core of the rotary transformer, and coils are fitted into these grooves to form the outer core. Before being inserted into the outer core, this coil is formed into a perfect circle in advance, and then it is transformed into a cross shape or a concave shape to reduce the outer dimensions of the coil and form a groove inside the outer core. I put it in.

[0003]

However, in such a coil mounting and inserting method, the work of deforming the coil is complicated, and the amount of deformation is considerably large. For this reason, when the shape is restored in the groove, distortion remains in the coil and the coil does not become a perfect circular shape. Therefore, there is a possibility that the coil may stick out of the groove inside the outer core, and it is necessary to press-mold with a roller or the like.

Further, in order for the coil to be deformed as described above, it is necessary to grasp and change a predetermined jig several times, and at that time, there remains an instability factor such as unnecessary twisting or dropping of the coil. There is a problem that there is (JP-A-62-54
411, JP-A-60-130807).

Furthermore, the method of forming the coil by directly winding the coil in the groove for the coil requires a notch in the outer core or has a drawback in that it becomes difficult when the number of turns of the coil is large (Japanese Patent Laid-Open No. Sho 6-96). 59-149015, JP-A-62-150703).

The present invention has been made in order to solve the above-mentioned problems, and when the outer core is inserted into the coil, no distortion remains in the coil, and further, there is no need for processing by a forming roller after the insertion. In particular, it is an object of the present invention to provide a coil insertion method and insertion device for a rotary transformer, which can insert a coil regardless of the number of coil windings.

[0007]

According to the present invention, the above object is achieved by deforming a circular coil into an elliptical shape or an oval shape, and by deforming the coil into an outer core of a rotary transformer. , The rotary transformer that inserts the deformed coil into the groove formed inside the outer core while tilting with respect to the central axis of the outer core, and restores the coil to the original circular shape. It is achieved by a coil insertion method for the.

Further, the above-mentioned object is, in an insertion device for inserting a circular coil into a groove formed inside an outer core constituting a rotary transformer, an elliptic or oval shape is formed from the circular coil. The deformed product is provided with an insertion jig that is inclined with respect to the center axis of the outer core and is inserted into the outer core, and the insertion jig is inserted into the outer core while holding the coil. This can also be achieved by a coil inserting device for a rotary transformer configured to insert a deforming coil into a groove formed inside the core and restore the circular shape.

Further, the above-mentioned object is, in an insertion device for inserting a circular coil into a groove formed inside an outer core which constitutes a rotary transformer, inclining the coil with respect to a central axis of the outer core. An insertion jig for insertion into the outer core is provided, and the insertion jig has a projecting member that can freely move in and out and elastically deformable, and a holding unit that forcibly holds the projecting member in a projecting state. By rotating the insertion jig with the protruding member in the protruding state by the holding means, the wire can be wound around the insertion jig through the protruding member to form an elliptical or oval coil. Is inserted inside the outer core against the elasticity, so that the deformation coil is inserted into the groove formed inside the outer core to restore the circular shape. By-yl insertion device can be achieved.

Further, the projecting member has a curved surface on which the coil slides when the coil is tilted with respect to the central axis of the outer core, and the holding means rotates to insert the projecting member. It may be configured to project from the outer periphery of the tool.

Further, the above object is to produce a deformed elliptical or oval coil by projecting and winding a projecting member from an insertion jig, and the deformed coil constitutes an outer core constituting a rotary transformer. The coil is restored into a circular shape by inserting it inside the outer core by tilting it with respect to the central axis of the outer core and against the elasticity of the projecting member, and inserting the deformed coil inside the premises formed inside the outer core. It can also be achieved by a coil insertion method for a rotary transformer. In the insertion method of inserting a circular coil into the outer core that constitutes the rotary transformer, the above-mentioned object is to deform the coil into an oval shape and insert the coil into the outer core while tilting it with respect to the central axis of the outer core. After being restored to a circular shape, the protrusion is projected to press the coil against the groove bottom formed in the outer core, and the insertion jig is further rotated to make the entire periphery of the coil follow the groove bottom by the protrusion. It is achieved by a coil insertion method for the. Preferably, when the coil is restored to the circular shape, the insertion jig is rotated in the same direction as the winding direction of the coil. The above-mentioned purpose is provided with a cam shaft for driving the projection of the jig, the cross-sectional shape of this cam shaft is indefinite, and the projection of the projection given when the elliptical coil is restored to the circular shape in the outer core. This is achieved by a coil insertion device for a rotary transformer configured to change the amount and the amount of protrusion of a protrusion provided when the insertion jig is rotated to press this coil against the bottom of the groove in the outer core.

[0012]

[Operation] By transforming a circular coil into an elliptical or oval shape,
Moreover, it is inserted in the outer core in a state of being inclined with respect to the central axis of the outer core. Therefore, even if the outer diameter of the circular coil is larger than the inner diameter of the outer core, the deformed coil can be easily inserted into the outer core. Then, after inserting the deformed coil into the groove of the outer core, it is only necessary to restore the shape of the coil from elliptical or elliptical to circular. This restoration allows the elasticity of the coil itself to maintain a stable coil insertion state in the coil groove.

An oblong or elliptical coil is formed on the insertion jig by protruding and winding a projection (206 in the embodiment) which is a protruding member around the insertion jig.
Then, the deformed coil is tilted with respect to the central axis of the outer core, inserted into the outer core, and inserted into the groove of the outer core to form a circular coil.

[0014]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

1 and 2 show an outer core 1 of a rotary transformer used in an embodiment of the present invention.
This rotary transformer is of a cylindrical type and is of a coaxial type and a vertical type. Inside the outer core 1,
A plurality of grooves 2 formed along the circumferential direction for coil mounting
And a longitudinal groove 6 for drawing out a coil end (hereinafter referred to as a lead wire) 8 is formed. A terminal 7 is attached to the outer side of the outer core 1. Each groove 2 of the outer core 1
A plurality of coils 5 having the shape shown in FIG. The lead wire 8 is fixed by being inserted along the lead-out groove 6 and further connected to the terminal 7.
By repeating this procedure, the outer core 1 shown in FIGS. 1 and 2 is manufactured.

On the other hand, the inner core 12 shown in FIG. 2 has a cylindrical shape, and a plurality of outer grooves 14 are formed on the outer periphery thereof, and coils 16 are attached to the outer grooves 14, respectively. The coils 16 are connected to the pins 18.

[First Embodiment] The coil 5 is provided with a lead wire 8 as shown in FIG. The coil 5 has already been fused with the winding in advance. Specifically, the coil 5 is wound on the outside of the outer core 1 by a winding jig (not shown), and the wire is fused by a solvent or hot air.
Here, for example, the wire of the coil 5 is a self-bonding wire, which is wound around a shaft to form a coil, which is then dripped with alcohol and naturally dried.

As a result, the perfect circular coil 5 is formed.
At this stage, as shown in FIG. 4, the outer diameter dimension L of the coil 5 is
1 is larger than the inner diameter dimension L2 of the outer core 1. Therefore, the coil 5 cannot be inserted into the groove 2 of the outer core 1 as it is. Therefore, as shown in FIG. 5, the coil 5 is tilted by an angle θ so that the apparent dimension L3 is smaller than the inner diameter dimension L2 of the outer core 1. Next, FIG.
As shown in FIG. 5, one diameter of the coil 5 is deformed so as to be smaller than not only the outer diameter dimension L1 of the coil 5 but also the inner diameter dimension L2 of the outer core 1, and the set dimension L4 is set. At this time, the coil 5 is transformed from a perfect circle to an ellipse or an ellipse. The set dimension L4 is, for example, a dimension in the minor axis direction of the ellipse.

While maintaining the state of the coil, as shown in FIG. 7, the coil 5 is provided with a cylindrical pushing jig 13 whose tip has a predetermined inclination, and a cylindrical stopper 14 so as to use the outer core 1. Insert inside. Here, the pushing jig 13 and the stopper 14 constitute a coil insertion device. The coil is inserted using this coil insertion device. The outer diameter L5 of the pushing jig 13 is smaller than or substantially the same as the inner diameter dimension L2 of the outer core 1. Moreover, the end surface 13a of the pushing jig 13 is formed of an inclined surface having the same angle as the inclination angle θ of the coil 5. In addition, the stopper 14
The outer diameter of is also the same as the outer diameter L5 of the pressing jig 13, and the stopper 14 is inserted into the outer core 1 in advance.
The end surface 14a of the stopper 14 is aligned with the end of the groove 2. An escape groove 14b for guiding the lead wire 8 is formed in the stopper 14 in the axial direction.

The coil 5 is inserted by the pushing jig 13 until it comes into contact with the stopper 14. The pushing jig 13 is rotated about the central axis C as shown in FIG. As a result, the coil 5 is stopped by the tip portion 13b of the pushing jig 13
Since it is pushed to the 4 side, the coil 5 gradually enters the groove 2. Since the coil 5 remains deformed into an ellipse or an ellipse, the portion of the coil 5 that has entered the groove 2 does not come out.
As the pushing jig 13 makes one rotation, the winding of the coil 5 is pushed into the coil groove 2 while being squeezed along the wire and is corrected into a circular shape. After this
Then, as shown in FIG. 10, the stopper 14 and the pushing jig 13 are pulled out from the outer core 1.

Thus, the coil 5 can be reliably inserted into the groove 2 of the outer core 1 and no distortion remains.

[Second Embodiment] FIG. 11 shows a second embodiment of the coil inserting device. In the figure, one end of the insertion jig 30 is fixed by a fixing portion 31. Fixed part 31
Is configured to be movable in the arrow direction along the support base 32. The shaft portion 16 of the insertion jig 30 is provided with a lead wire escape groove 21 and a step 22.

This step 22 plays a role of the stopper 14 in the embodiment shown in FIG. The sleeve 17 is attached around the shaft portion 16 via a bearing 19. The sleeve 17 is provided with a tip portion 23 and a step portion 24, which replace the pushing jig 13 of the embodiment shown in FIG. Further, a collar 18 for guiding the coil winding and for moving the coil after fusion of the windings is provided outside the sleeve 17. The step portion 24 is for winding to form a perfect circular coil.

The outer core 1 is positioned and positioned coaxially with the insertion jig 30 so as to face it. An insertion guide 20 is detachably attached to the outer core 1.
The inner diameter of the insertion guide 20 is set to be the same as the inner diameter of the outer core 1. The insertion guide 20 has an inclined surface 25 and a lead wire clearance groove 26. Slope 25
Is inclined at an inclination angle opposite to that of the distal end portion 23 of the sleeve 17, as shown in the figure. The escape groove 26 for the lead wire is
It is aligned with the escape groove 6 of the lead wire of the outer core 1.

This embodiment is constructed as described above,
Next, the insertion operation of the coil by the insertion device of FIG. 11 will be described with reference to FIG.
~ It demonstrates, referring to FIG. As shown in FIG. 12, a wire is wound by a so-called flyer method or a spindle rotation method by using a self-bonding wire at the step 24 of the sleeve 17. This forms the coil 5 and its lead wire 8. As shown in FIG. 13, while holding the lead wire 8, the coil 5 is moved in the arrow direction by the collar 18 to drop the coil 5 into the gap between the tip portion 23 of the sleeve 17 and the step 22.

In this state, as shown in FIG. 14, the insertion jig 30 is moved in the direction of the arrow, or the outer core 1 and the insertion guide 20 are moved to the left in the figure, and the tip portion of the sleeve 17 is moved. 23 and the inclined surface 25 of the insertion guide, the coil 5 is gradually inclined and follows the sleeve tip portion 23. At this time, the lead wire 8 is in the clearance groove 6 of the outer core 1 and the clearance groove 26 of the insertion guide 20. Further, the insertion jig 30 is moved, and when the groove 2 and the step 22 of the insertion shaft 30 are aligned with each other as shown in FIG.
Stop 0.

Next, as shown in FIG. 16, the sleeve 17
Is rotated about the central axis C, the coil 5
It is pushed by the convex portion 27 of the tip portion 23 of 7 and gradually enters the groove 2 for the coil. When the sleeve 17 rotates once,
The entire circumference of the coil 5 enters the groove 2 for the coil. After this,
As shown in FIG. 7, the insertion jig 30 is withdrawn and the lead wire 8 is wound around the terminal 7. In this procedure, the coil 5 is inserted into each groove 2 of the outer core 1 to complete the outer core 1.

[Third Embodiment] In the embodiment shown in FIGS. 18 and 19, the insertion jig 130 is divided into strip-shaped components 28 and 29 by slits or grooves. this house,
As shown in FIG. 20, the component 28 is provided with an escape groove 80 for a lead wire. Each of these parts 28 and 29 expands in the arrow direction (radially outside) or contracts inward in the radial direction as shown in FIG. 19, and is movable in the arrow direction in FIG.

When winding the coil 5, as shown in FIG. 21, the strip-shaped components 28 and 29 are expanded to have a required diameter. Forming coil winding and lead wire by flyer method or spindle rotation method,
The coil 5 and the lead wire 8 are formed. Next, the parts 28, 29
While contracting as shown in FIGS. 22 and 23, each component 29 moves a different distance in the axial direction and shifts its position. Thereby, the coil 5 can be tilted as shown in FIG. 22 for inserting the coil 5. In this state, after being inserted into an outer core (not shown) and moved to the position of the coil groove of the outer core, the component 2 shown in FIG.
9-1, 29-2, 29-3, and 29-4 are moved in this order in the direction of arrow F. This allows the coil 5 to be inserted into the groove of the outer core.

[Fourth Embodiment] In the fourth embodiment of the coil inserting device shown in FIG. 24, one end of the inserting jig 200 is fixed by a fixing portion 210. The main shaft 20 in which the cam shaft 209 is inserted into the fixed portion 210 via the bearing 205
1 is attached. The cam shaft 209 can rotate in the direction of arrow C independently of the main shaft 201.

A sleeve 202 is provided outside the main shaft 201.
Is attached, and further, the sleeve 203 is attached to the outside thereof via a bearing 204. Therefore, the main shaft 201 and the sleeve 202 are integrated and can rotate in the direction of arrow A with respect to the fixed portion 210, and the sleeve 203 can rotate in the direction B independently of the main shaft 201 and the sleeve 202.

On the sleeve 202, the first protrusion 20 is provided.
6 and the second protrusion 207 are attached, and the cam shaft 209 allows them to move in and out in the directions of arrows D and E, respectively.
Further, a step 211 is formed by covering the sleeve 208 from above.

The present embodiment is configured as described above,
Next, the coil winding operation will be described. As shown in FIGS. 25 and 26, the cam shaft 209 is rotated to rotate the first projection 20.
The coil 215 is wound in the state where 6 is output. First, the wire W1 is attached to the groove 219 of the step 211 of the sleeve 208.
The main shaft 201 and the sleeve 202 with the arrow A
, The sleeve 203 is rotated in synchronization with the direction of arrow B, that is, at the same speed and at the same timing. The rotation is stopped when the predetermined number of rotations is reached. The wire W is fused by solvent fusion, hot air fusion, electric heating fusion, or a combination of the two using a self-bonding wire to form the coil 21.
5 is formed.

Next, the end W2 of the wire W is inserted into the groove 219 of the step 211 of the sleeve 208 and fixed. This completes the elliptical or oval coil 215. FIG. 27
, The cam shaft 209 is rotated to move the first protrusion 2
It is separated from 06. Then, the coil 215 tries to contract due to the tension applied to the wire W1 at the time of winding, but the elastic force H of the first projection 206 balances and holds the coil 215 in that state.

As shown in FIG. 28, the outer core 2 of the rotary transformer fixed on the same axis as the insertion jig 200.
The insertion jig is moved in the direction of arrow F toward 13 and the insertion guide 214 attached thereto. Coil 21
As edge 5 enters the insertion guide 214, the edge 216 of the first protrusion 206 causes the inner diameter surface 21 of the insertion guide 214 to move.
7 (see FIGS. 29 and 30). Then, the first projection 206 is forcibly gradually pulled in the direction of the arrow D, and at the same time, the coil 215 begins to tilt while entering the insertion guide 214, and the curved surface 220 on the first projection 206.
And slide in the direction of arrow G.

This state is schematically shown in FIGS. 29 to 31. At this time, if the curved surface 220 is appropriately formed, the coil 215 can be always held by the elastic force of the first protrusion 206 until the coil completely enters the insertion guide 214, and the coil 215 is disengaged from the gap 221 formed by the sleeve 211 and the sleeve 212. There is no such thing.

Further, the insertion jig 2 is moved in the direction of arrow F in FIG.
00 to move the coil 215 of the outer core 213.
Then, it is stopped when the position of the gap 221 of the insertion jig 200 is aligned.

As shown in FIG. 32, when the sleeve 203 is rotated once or more in the direction of arrow B, the coil 215 is rotated.
Are inserted into the grooves of the outer core 213. As shown in FIG. 33, the cam shaft 209 is rotated in the direction of arrow C, and the second
The protrusion 207 of the second protrusion 2 in the direction of arrow E.
The tip of 07 is applied to the coil 215. This coil 215
After removing the terminals W1 and W2 from the insertion jig 200 and fixing them to the outer core 213, the main shaft 201 and the sleeve 202 are synchronized in the direction of the arrow B, that is, rotated once at the same speed and at the same timing, Mold the coil by applying pressure.

Finally, the cam shaft 209 is rotated to retract the second protrusion 207, the insertion jig 200 is returned in the direction of arrow I, and the next winding is inserted.

The present invention is not limited to the above embodiment. For example, in FIG. 24, the one without the second protrusion 207 can be adopted. This configuration is because the operation shown in FIG. 33 is unnecessary if the coil after insertion is not deformed.

As described above, in the fourth embodiment, the insertion jig 2
By providing the first protrusions 206 and 207 that can be moved in and out on the 00, the winding of the coil can be directly performed on the insertion jig 200, and the stable insertion of the coil into the outer core is possible.

That is, a circular coil is deformed into an elliptical or elliptical shape in a groove formed inside the outer core of a cylindrical rotary transformer, and the coil is inserted at an angle with respect to the central axis of the outer core. In the insertion device that restores to, by providing a protrusion that can be driven in and out by a cam on the portion of the insertion jig where the coil is tilted and held, the coil can be wound directly on the coil holding part. The coil insertion operation can be performed in the same part of the insertion jig.

Therefore, in the fourth embodiment, the coil wound by another device is attached to the coil holding part on the insertion jig of the device, or the coil winding having a larger diameter than the coil holding part is inserted on the insertion jig. It is not necessary to provide a wire portion or move it to the coil holding portion wound there. Therefore, there is no need for a mechanism or a device for gripping and moving a coil having a wound wire, and the entire insertion device can be simplified.

Further, since it is not necessary to remove the coil after forming the winding from the winding jig and attach it to the insertion jig, the coil can be positioned and positioned on the coil holding portion on the insertion jig without being deformed more than necessary. It is possible to avoid difficult mounting.
Furthermore, since a mechanism for pressing the coil attached to the coil holding portion when inserting it into the outer core is provided, there is no risk of cutting the coil during insertion.

[Fifth Embodiment] In the fifth embodiment of the coil inserting device shown in FIG. 34, one end of the inserting jig 200 is fixed by a fixing portion 210. The main shaft 20 in which the cam shaft 209 is inserted into the fixed portion 210 via the bearing 205
1 is attached. The cam shaft 209 can rotate in the direction of arrow C independently of the main shaft 201.

A sleeve 202 is provided outside the main shaft 201.
Is attached, and further, the sleeve 203 is attached to the outside thereof via a bearing 204. Therefore, the main shaft 201 and the sleeve 202 are integrated and can rotate in the direction of arrow A with respect to the fixed portion 210, and the sleeve 203 can rotate in the direction B independently of the main shaft 201 and the sleeve 202.

On the sleeve 202, the first protrusion 20 is provided.
6 and the second protrusion 207 are attached, and the cam shaft 209 allows them to move in and out in the directions of arrows D and E, respectively.
Further, a step 211 is formed by covering the sleeve 208 from above.

The fifth embodiment is constructed as described above. Next, the coil winding operation will be described. 35 and 3
As shown in FIG. 6, the winding of the coil 215 is performed with the cam shaft 209 rotated so that the first protrusion 206 is exposed. First, the wire W1 is inserted and fixed in the groove 219 of the step 211 of the sleeve 208, the main shaft 201 and the sleeve 202 are synchronized in the direction of arrow A, and the sleeve 203 is synchronized in the direction of arrow B, that is, at the same speed and at the same timing. Rotate. The rotation is stopped when the predetermined number of rotations is reached. The wire W is fused by solvent fusion, hot air fusion, electric heating fusion, or a combination thereof using a self-bonding wire to form the coil 215.

Next, the end W2 of the wire W is inserted into the groove 219 of the step 211 of the sleeve 208 and fixed. This completes the elliptical or oval coil 215. FIG. 37
, The cam shaft 209 is rotated to move the first protrusion 2
It is separated from 06. Then, the coil 215 tries to contract due to the tension applied to the wire W1 at the time of winding, but the elastic force H of the first projection 206 balances and holds the coil 215 in that state.

As shown in FIG. 38, the outer core 2 of the rotary transformer fixed on the same axis as the insertion jig 200.
The insertion jig is moved in the direction of arrow F toward 13 and the insertion guide 214 attached thereto. Coil 21
As edge 5 enters the insertion guide 214, the edge 216 of the first protrusion 206 causes the inner diameter surface 21 of the insertion guide 214 to move.
7 (see FIGS. 39 and 40). Then, the first projection 206 is forcibly gradually pulled in the direction of the arrow D, and at the same time, the coil 215 begins to tilt while entering the insertion guide 214, and the curved surface 220 on the first projection 206.
And slide in the direction of arrow G.

This state is schematically shown in FIGS. 39 to 41. At this time, if the curved surface 220 is appropriately formed, the coil 215 can be always held by the elastic force of the first protrusion 206 until the coil completely enters the insertion guide 214, and the coil 215 is disengaged from the gap 221 formed by the sleeve 211 and the sleeve 212. There is no such thing.

Further, the insertion jig 2 is moved in the direction of arrow F in FIG.
00 to move the coil 215 of the outer core 213.
Then, it is stopped when the position of the gap 221 of the insertion jig 200 is aligned.

As shown in FIG. 42, when the sleeve 203 is rotated once or more in the direction of arrow C, the coil 215 is rotated.
Is inserted into the groove 215 of the outer core 213. What is important in this fifth embodiment is that the sleeve 2
The rotation direction of 03 (arrow C) is the same as the winding direction of the coil 215. Thus, the sleeve 203
By setting the rotation direction (arrow C) to be the same as the winding direction of the coil 215, there is no fear that the winding of the coil W will be scattered. If not, sleeve 203
When the rotation direction of the coil W is set to be opposite to the winding direction of the coil 215, when the sleeve 203 is rotated, the coil W is restored to a circular shape inside the outer core 213 when the fusion force of the winding of the coil W is weak. At that time, the coil W may be separated.

As shown in FIG. 43, the cam shaft 209 is moved in the direction of arrow C.
In the direction of arrow E, the tip of the second protrusion 207 is applied to the coil 215. Insert the terminals W1 and W2 of the coil 215 into the insertion jig 2
After removing from No. 00 and fixing to the outer core 213, the main shaft 201 and the sleeve 202 are synchronized with each other in the direction of arrow B, that is, rotated once at the same speed and at the same timing, and pressure is applied to the coil for molding.

Next, a sixth embodiment particularly related to the fifth embodiment will be described. As shown in FIG. 43, when rotating the last main shaft 201 and sleeve 202 in the direction of arrow B, a cam shaft 209 having a cross-sectional shape as shown in FIG. 44 is used. This sectional shape has a so-called irregular shape. This cam shaft 209
45 is rotated counterclockwise from the initial position (see FIG. 44) indicated by arrow D in FIG. Cam shaft 20
9 makes the projection 207 project in the arrow direction (upward in the drawing).
As a result, as shown in FIGS. 46 and 47, the coil 21
The protrusion 207 is further protruded so that 5 is completely pushed into the coil groove 215a of the outer core 213. Then, the main shaft 201 and the sleeve 202 are rotated once at the same speed and at the same timing to form the coil 215, so that a better coil forming state can be obtained. That is, the circular coil 21 can be arranged in the coil groove 215a. In this way, the protrusion amount of the protrusion 207 that is given when the elliptical coil is restored to the circular shape inside the outer core, and when the insertion jig is rotated to press the coil against the groove bottom portion inside the outer core, The amount of protrusion of the protrusion is changed.

When the coil is to be restored to the circular shape by simply rotating the sleeve of the insertion jig in the outer core, it depends on the rigidity of the coil itself and the sliding condition between the groove in the outer core and the coil W. To do. For this reason, as illustrated in FIG. 46, a part of the coil is not necessarily completely restored to the circular shape, and there is a possibility that a part of the coil may jump out from the groove 215 inward. In such a case, the insertion jig 200
When pulling out from the outer core 213, a part of the coil is applied to the end surface of the stopper and cut. However, according to the method of the sixth embodiment as described above, such disconnection of the coil W can be completely prevented.

[0057]

As described above, according to the present invention, a circular coil is deformed into an elliptical shape or an oval shape, and the coil is inserted into the outer core by inclining the coil with respect to the central axis of the outer core. Even if the coil is restored to a circular shape, there is almost no distortion in the coil and insertion is easy. Then, an elliptical or oval coil can be inserted into the groove to be easily restored to a circular shape, whereby the coil is closely attached to the groove of the coil and does not protrude into the space inside the outer core. That is, the insertion / holding state of the coil can be reliably maintained, and the manufacturing accuracy of the rotary transformer is improved. Further, according to the inventions of claims 3 to 5, since the coil winding is performed on the insertion jig, the transfer or movement of the coil is unnecessary. For this reason, it is not necessary to separately provide means for transferring or moving the coil in the insertion device, the device is simplified, and there is no risk of accidental deformation due to transfer of the coil. Since the protrusion protruding during the coil winding has elasticity, it plays a role of pressing the coil when the coil is inserted, and it becomes possible to stably insert the outer core of the coil. According to the invention of claims 6 and 8, when the coil is restored to the circular shape, a part of the coil does not protrude into the outer core, and the coil is completely inserted into the groove of the outer core and arranged. It is possible to do According to the invention of claim 7, when the coil is restored to have a circular shape, the winding of the coil does not come apart and the coil can be set correctly.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outer core of a rotary transformer.

FIG. 2 is a diagram showing an outer core and an inner core of a rotary transformer.

FIG. 3 is a perspective view showing a coil used in this embodiment.

FIG. 4 is a diagram showing an initial setting state of an outer core and a coil in a preferred embodiment of the present invention.

FIG. 5 is a view in which the coil is arranged to be inclined with respect to the outer core in the preferred embodiment of the present invention.

FIG. 6 is a view showing a state in which the coil is deformed in the preferred embodiment of the present invention.

FIG. 7 is a diagram showing a state where a tilted coil is being inserted into the outer core using the insertion device of the first embodiment.

8 is a diagram showing a state in which the insertion shaft of the insertion device in FIG. 7 is rotated to push the coil into the groove of the outer core.

FIG. 9 is a view showing a state in which the coil is completely fitted in the groove of the outer core.

FIG. 10 is a diagram with the insertion shaft removed according to the first embodiment.

FIG. 11 is a sectional view showing a second embodiment of the insertion device of the invention.

12 is a diagram in which a coil is attached to the sleeve of the insertion device in FIG.

FIG. 13 is a diagram in which a coil moves on a sleeve and is fixed to a front end surface.

FIG. 14 is a diagram in which a coil is inserted into an insertion guide and an outer core.

FIG. 15 is a view showing a state in which a part of the coil has entered the groove of the outer core.

FIG. 16 is a view showing a state in which the entire circumference of the coil has entered the groove of the outer core.

FIG. 17 is a view with the insertion shaft removed from the outer core and the insertion guide.

FIG. 18 is a view showing a second embodiment of the insertion device of the invention.

FIG. 19 is an end view of the embodiment of the insertion device of FIG.

20 is a cross-sectional view taken along the line AA in FIG.

FIG. 21 is a view showing a third embodiment of the insertion device of the invention.

22 is a view showing a state where the coil is inserted into the outer core according to the embodiment of FIG.

23 is an end view of the embodiment of FIG. 22.

FIG. 24 is a view showing an insertion device according to the fourth embodiment of the present invention.

FIG. 25 is a view showing a state where one projection of the insertion device in FIG. 24 is projected by a cam shaft.

26 is a sectional view taken along line XX of FIG. 25.

FIG. 27 is a view showing a state in which the cam shaft is separated from one protrusion protruding in FIG. 25.

FIG. 28 is a diagram in which a coil is about to be inserted into the outer core side.

FIG. 29 is a view showing a state immediately before the coil is inserted into the insertion guide.

FIG. 30 is a view showing a state in which the coil is inserted in the insertion guide and one protrusion is pushed inward.

FIG. 31 is a view showing a state in which the coil has entered the insertion guide.

FIG. 32 is a view showing a state in which the coil has entered the groove of the outer core.

FIG. 33 is a view showing a state where the coil is completely inserted into the groove of the outer core by the protrusion of another protrusion.

FIG. 34 is a view showing an inserting device according to a preferred fifth embodiment of the present invention.

35 is a view showing a state where one protrusion of the insertion device in FIG. 34 is projected by the cam shaft.

36 is a sectional view taken along line XX of FIG. 35.

FIG. 37 is a diagram showing a state where the cam shaft is separated from one protrusion that protrudes in FIG. 35.

FIG. 38 is a diagram in which a coil is about to be inserted into the outer core side.

FIG. 39 is a view showing a state immediately before the coil is inserted into the insertion guide.

FIG. 40 is a view showing a state in which the coil is inserted in the insertion guide and one protrusion is pushed inward.

FIG. 41 is a view showing a state where the coil is inserted in the insertion guide.

FIG. 42 is a view showing a state where the coil has entered the groove of the outer core.

FIG. 43 is a view showing a state where the coil is completely inserted into the groove of the outer core by the protrusion.

FIG. 44 is a diagram showing a cam shaft and a protrusion in a sixth preferred embodiment of the present invention.

45 is a view showing a state in which the cam shaft shown in FIG. 44 is rotated and the protrusion is projected.

46 is a view corresponding to the position of the cam shaft in FIG. 44,
The figure which shows a mode that a part of coil winding has protruded from the groove | channel of an outer core.

47 is a diagram corresponding to the position of the cam shaft in FIG. 45,
FIG. 46 is a diagram showing a state in which all the windings of the coil are pushed into the bottom portion by the protrusions protruding toward the groove side of the outer core as shown in FIG. 45.

[Explanation of symbols]

 1 Outer core 2 Grooves for coil 5, 215 Coil 8 Lead wire 13 Push jig for insertion device 14 Stopper 20 Insertion guide 30 Insertion jig

Claims (8)

[Claims] 1. A circularly shaped coil is deformed into an elliptical shape or an oval shape, and the deformed coil is inserted inside the outer core constituting the rotary transformer while being inclined with respect to the central axis of the outer core. A coil insertion method for a rotary transformer, in which a deformed coil is inserted into a groove formed inside the outer core and the coil is restored to the original circular shape. 2. An insertion device for inserting a circular coil into a groove formed inside an outer core which constitutes a rotary transformer, wherein the circular coil is deformed into an elliptical or oval shape, An inserting jig that is inclined with respect to the central axis of the outer core and is inserted into the outer core is provided, and the inserting jig is inserted into the outer core while holding the coil, and is formed inside the outer core. A coil inserting device for a rotary transformer, characterized in that the deforming coil is inserted into the groove to restore the circular shape. 3. An insertion device for inserting a circular coil into a groove formed inside an outer core that constitutes a rotary transformer, wherein the coil is tilted with respect to a central axis of the outer core and placed inside the outer core. An inserting jig for inserting is provided, and the inserting jig has a projecting member that can freely move in and out and is elastically deformable, and a holding unit that forcibly holds the projecting member in a projecting state. When the insertion jig is rotated in a protruding state, the wire can be wound around the insertion jig through the protruding member to form an elliptical or oval coil, and the protruding member resists elasticity. For a rotary transformer, the deformation coil is inserted into a groove formed inside the outer core to restore a circular shape by being inserted inside the outer core. Coil insertion device. 4. The projecting member has a curved surface on which the coil slides when the coil is tilted with respect to the central axis of the outer core, and the holding means rotates to insert the projecting member. Characterized in that it is configured to protrude from the outer periphery of
Coil insertion device for rotary transformer. 5. An elliptical or oval deformed coil is produced by projecting a projecting member from an insertion jig and winding the coil, and the deformed coil is placed inside an outer core constituting a rotary transformer. It is characterized in that it is inclined with respect to the central axis of the core and inserted against the elasticity of the projecting member, and the deformed coil is inserted into the premises formed inside the outer core to restore the coil into a circular shape. , Coil insertion method for rotary transformer. 6. An insertion method for inserting a circular coil into an outer core which constitutes a rotary transformer, wherein the coil is deformed into an oval shape, and the coil is inserted into the outer core while being inclined with respect to a central axis of the outer core, After restoring the coil to a circular shape, project the protrusion and press the coil against the groove bottom formed in the outer core, and then rotate the insertion jig to make the protrusion follow the entire circumference of the coil to the groove bottom. A method for inserting a coil for a rotary transformer, characterized by: 7. The coil insertion method for a rotary transformer according to claim 6, wherein the insertion jig is rotated in the same direction as the winding direction of the coil when the coil is restored to the circular shape. 8. A cam shaft for driving a projection of a jig is provided, and the cross-sectional shape of this cam shaft is indefinite, and a projection provided when the elliptical coil is restored to a circular shape in the outer core. Coil insertion for a rotary transformer, characterized in that the amount of protrusion and the amount of protrusion of a protrusion given when the insertion jig is rotated to press this coil against the bottom of the groove in the outer core are changed. apparatus.