JP3318647B2 - Method and apparatus for inserting coil for rotary transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
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 technology has been employed for mounting a coil used in a rotary transformer. That is, grooves are formed on the inner periphery of the outer core of the rotary transformer, and coils are inserted into these grooves to form the outer core. Before inserting the coil into the outer core, the coil is formed into a perfect circle outside, and then deformed into a cross or a concave shape to reduce the outer dimensions of the coil and to fit the groove inside the outer core. I was putting in.

[0003]

However, in such a method of mounting and inserting a coil, the operation of deforming the coil is complicated and the amount of deformation is considerably large. Therefore, when the shape is restored in the groove, distortion remains in the coil, and the coil does not become a completely circular coil. Therefore, there is a possibility that the coil may protrude from the groove inside the outer core, and it is necessary to always perform press molding with a roller or the like.

Further, in order for the coil to deform as described above, it is necessary to grasp and change a predetermined jig several times, and in such a case, unstable factors such as unnecessary twisting and dropping of the coil remain. (Japanese Unexamined Patent Publication No. Sho 62-54)
411, JP-A-60-130807).

Further, the method in which the coil is formed by directly winding the coil in the groove for the coil has a disadvantage that a notch in the outer core is required, and it becomes difficult to increase the number of turns of the coil (Japanese Patent Laid-Open No. 59-149015 and JP-A-62-150703).

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and when the coil is inserted into the outer core, no distortion remains in the coil, and further, there is no need for working with a forming roller after the insertion. In particular, it is an object of the present invention to provide a coil insertion method and an insertion device for a rotary transformer that can insert a coil regardless of the number of coil windings.

[0007]

[0008]

According to a first aspect of the present invention, there is provided an insertion device for inserting a circular coil into a groove formed inside an outer core constituting a rotary transformer. An insertion jig is provided to be inclined with respect to the shaft and inserted into the outer core. Means for holding the projecting member in a protruding state by the holding means, and rotating the insertion jig, thereby winding a wire around the insertion jig through the projecting member to form an elliptical or oblong coil. A rotor having a configuration in which a protruding member is inserted into the outer core against elasticity so that a deformed coil is inserted into a groove formed inside the outer core to restore the circular shape. The coil insertion apparatus for over transformers, can be achieved.

According to a second aspect of the present invention, there is provided the configuration according to the first aspect.
The projecting member has a curved surface on which the coil slides when the coil is inclined with respect to the center axis of the outer core, and the holding means rotates the projecting member to rotate the outer periphery of the insertion jig. It is characterized in that it is configured to protrude more. According to a third aspect of the present invention, in the configuration of the second aspect, a cam shaft for driving the projecting member , which is a projection of the jig , is provided. The amount of protrusion of the protruding member provided when restoring a circular shape in the outer core, and the amount of protrusion of the protruding member provided when rotating the insertion jig to press the coil against the groove bottom in the outer core, Is changed.

According to a fourth aspect of the present invention , a rotary transformer is constructed.
Insert a circular coil inside the outer core
In the insertion method, an elliptical or elliptical deformed coil is created by projecting and winding a projecting member from an insertion jig, and this deformed coil is placed inside an outer core constituting a rotary transformer. A coil for a rotary transformer, which is inserted into the premises formed inside the outer core by tilting with respect to the center axis of the protruding member and inserting the deformed coil into the yard formed inside the outer core to restore the coil to a circular shape. Insertion method. The invention of claim 5 is
In the insertion method of inserting a circular coil inside the outer core that constitutes the rotary transformer, the coil is deformed into an oval shape, inserted into the outer core at an angle to the center axis of the outer core, and the coil is formed into a circular shape. After restoring,
This is a coil insertion method for a rotary transformer, in which a projection is projected to press a coil against a groove bottom formed in an outer core, and furthermore, an insertion jig is rotated to cause the entire coil to follow the groove bottom by the projection. . The invention of claim 6 is
In the configuration of claim 5, when to restore the coil into a circular shape, and wherein rotating the insertion jig in the winding direction and the same direction of the coil Surru.

[0012]

[Action] A circular coil is transformed into an elliptical shape or an oval shape.
Moreover, the outer core is inserted into the outer core while being inclined with respect to the center 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 oval to circular. By this restoration, it is possible to maintain a stable insertion state of the coil in the coil groove due to the elasticity of the coil itself.

An elliptical or elliptical coil is formed on the insertion jig by projecting a projection (206 in the embodiment), which is a projecting member, around the insertion jig and winding it.
Then, the deformed coil is inserted into the outer core while being inclined with respect to the center axis of the outer core, and is inserted into the groove of the outer core to be converted into a circular coil.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are
Since it is a preferred specific example of the present invention, various technically preferred limitations are added, but the scope of the present invention is limited to the following description unless otherwise specified to limit the present invention.
It is not limited to these embodiments.

FIGS. 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 configured to be coaxial and vertical. Inside the outer core 1,
A plurality of grooves 2 formed along the circumferential direction for coil mounting
And a vertical groove 6 for drawing out a coil end (hereinafter referred to as a lead wire) 8. A terminal 7 is attached to the outside of the outer core 1. Each groove 2 of outer core 1
A plurality of coils 5 each having the shape shown in FIG. The lead wire 8 is inserted along the lead groove 6 and is fixed by being connected to the terminal 7.
By repeating this procedure, the outer core 1 shown in FIGS. 1 and 2 is produced.

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

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

As a result, the perfect circular coil 5 is formed.
At this stage, as shown in FIG.
1 is larger than the inner diameter dimension L2 of the outer core 1. For this reason, 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 inclined at a certain angle θ to make the apparent dimension L3 smaller than the inner diameter dimension L2 of the outer core 1. Next, FIG.
As shown in (1), 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 into an ellipse or an ellipse. The set dimension L4 is, for example, the dimension of the ellipse in the minor axis direction.

While maintaining the state of the coil, as shown in FIG. 7, the outer core 1 is formed by using a cylindrical pressing jig 13 having a tip inclined at a predetermined angle and a cylindrical stopper 14 as shown in FIG. 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 pressing jig 13 is smaller than or substantially equal to the inner diameter 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. Also, the stopper 14
Is 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. In the stopper 14, a clearance groove 14b for guiding the lead wire 8 is formed in the axial direction.

The coil 5 is inserted until it comes into contact with the stopper 14 by the pushing jig 13. The pushing jig 13 is rotated about the central axis C as shown in FIG. Thereby, the coil 5 is moved to the stopper 1 by the tip portion 13b of the pushing jig 13.
Since the coil 5 is pushed to the side, the coil 5 gradually enters the groove 2. Since the coil 5 remains deformed in an elliptical or elliptical shape, the portion of the coil 5 that has entered the groove 2 does not come out.
As the pressing jig 13 makes one rotation, the winding of the coil 5 is pushed into the coil groove 2 while being wrung along the wire, and is corrected into a circular shape. After this Figure 9
Then, as shown in FIG. 10, the stopper 14 and the pressing jig 13 are removed 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 insertion device. In the figure, one end of an insertion jig 30 is fixed by a fixing part 31. Fixed part 31
Is configured to be movable in the direction of the arrow along the support table 32. The shaft 16 of the insertion jig 30 is provided with an escape groove 21 for a lead wire and a step 22.

The step 22 serves as a substitute for the stopper 14 in the embodiment shown in FIG. The sleeve 17 is mounted around the shaft 16 via a bearing 19. The sleeve 17 is provided with a distal end portion 23 that replaces the pressing jig 13 of the embodiment of FIG. 7 and a step portion 24. Further, a collar 18 is provided outside the sleeve 17 for guiding during coil winding and for moving the coil after winding fusion. The step part 24 is for winding to make a perfect circular coil.

The outer core 1 is positioned so as to face the insertion jig 30 coaxially. 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 an escape groove 26 for a lead wire. Slope 25
Is inclined at an inclination angle opposite to that of the distal end portion 23 of the sleeve 17 as shown. 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 configured as described above.
Next, the insertion operation of the coil by the insertion device of FIG.
This will be described with reference to FIGS. As shown in FIG. 12, the wire is wound by a so-called flyer method or a spindle rotation method using a self-bonding wire at the step 24 of the sleeve 17. Thereby, the coil 5 and its lead wire 8 are formed. As shown in FIG. 13, the coil 5 is moved in the direction of the arrow with the collar 18 while holding the lead wire 8, and the coil 5 is dropped into the gap between the tip 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 FIG. 23 and the inclined surface 25 of the insertion guide, the coil 5 is gradually inclined and follows the sleeve distal end 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 as shown in FIG. 15, when the position of the step 2 between the groove 2 and the insertion shaft 30 is aligned, the insertion jig 3
Stop 0.

Next, as shown in FIG.
When the coil 5 is rotated about the central axis C, the coil 5
The tip 7 is pushed by the projection 27 and gradually enters the coil groove 2. When the sleeve 17 makes one rotation,
The entire circumference of the coil 5 enters the groove 2 for the coil. After this, FIG.
As shown in FIG. 7, the insertion jig 30 is withdrawn and the lead wire 8 is wound around the terminal 7. In such a 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 parts 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, 29 expands or contracts in the direction of the arrow (radially outward) as shown in FIG. 19, and is movable in the direction of the arrow in FIG.

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

Fourth Embodiment In a fourth embodiment of the coil insertion device shown in FIG. 24, one end of an insertion jig 200 is fixed by a fixing portion 210. The main shaft 20 in which the cam shaft 209 is inserted via the bearing 205
1 is attached. The camshaft 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 mounted, and a sleeve 203 is mounted on the outside thereof via a bearing 204. Therefore, the main shaft 201 and the sleeve 202 are integrated, and can be rotated in the direction of arrow A with respect to the fixed portion 210, and the sleeve 203 can be independently rotated in the direction of B with respect to the main shaft 201 and the sleeve 202.

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

This embodiment is configured as described above.
Next, the coil winding operation will be described. As shown in FIGS. 25 and 26, the first protrusion 20 is rotated by rotating the cam shaft 209.
The coil 215 is wound in a state where 6 is put out. First, the wire W1 is inserted into the groove 219 of the step 211 of the sleeve 208.
And fix the spindle 201 and the sleeve 202 with the arrow A
, The sleeve 203 is rotated in the direction of the arrow B, that is, at the same speed and at the same timing. The rotation is stopped when a predetermined number of rotations is reached. The wire W is fused using a self-fusing wire by solvent fusion, hot air fusion, energization heating fusion, or a combination thereof to form a coil 21.
5 is formed.

Next, the terminal W2 of the wire W is inserted into the groove 219 of the step 211 of the sleeve 208 and fixed. Thus, the elliptical or oval coil 215 is completed. FIG.
As shown in FIG.
06. Then, the coil 215 tries to contract due to the tension applied to the wire W1 at the time of winding, but is balanced by the elastic force H of the first projection 206 and held 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
5 enter the insertion guide 214, the edge 216 of the first projection 206
7 (see FIGS. 29 and 30). Then, the first protrusion 206 forcibly and gradually starts to be pulled in the direction of arrow D, and at the same time, the coil 215 starts to tilt while entering the insertion guide 214, and the curved surface 220 on the first protrusion 206
And move in the direction of arrow G.

This state is shown schematically in FIGS. 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 projection 206 until the coil completely enters the insertion guide 214, and the coil 215 is separated from the gap 221 formed by the sleeve 211 and the sleeve 212. Never.

Further, in the direction of arrow F in FIG.
00 by moving the coil 215 of the outer core 213.
When the position of the gap 221 of the insertion jig 200 is matched, the operation is stopped.

As shown in FIG. 32, when the sleeve 203 is rotated one or more turns in the direction of arrow B, the coil 215
Is inserted into the groove of the outer core 213. The camshaft 209 is rotated in the direction of arrow C as shown in FIG.
Of the second projection 2 in the direction of arrow E.
07 is applied to the coil 215. This coil 215
After removing the terminals W1 and W2 from the insertion jig 200 and fixing the terminals W1 and W2 to the outer core 213, the main shaft 201 and the sleeve 202 are synchronized in the direction of arrow B, that is, one rotation at the same speed and the same timing, The coil is formed by applying pressure.

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

Incidentally, the present invention is not limited to the above embodiment. For example, a structure without the second protrusion 207 in FIG. 24 can be employed. The reason for this configuration is that 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 enter and exit from the upper surface of the outer core, the coil can be directly wound 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 shape or an elliptical shape into a groove formed inside the outer core of a cylindrical rotary transformer, and is inserted obliquely with respect to the center axis of the outer core. In the insertion device that restores the position of the coil, by providing a projection that can drive in and out with a cam on the part of the insertion jig that tilts and holds the coil, it is possible to directly wind the coil holding part, and from the coil winding The operation up to 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 mounted on the coil holding portion on the insertion jig of the device, or the coil winding having a larger diameter than the coil holding portion is placed on the insertion jig. There is no need to provide a wire portion and move it to the coil holding portion wound there. For this reason, a mechanism or device for grasping and moving the coil unit formed with the winding is unnecessary, and the entire insertion device can be simplified.

Further, since it is not necessary to remove the coil after the formation of the winding from the winding jig and mount it on the insertion jig, the coil is not deformed more than necessary, so that the coil can be positioned on the coil holding portion on the insertion jig. It is possible to avoid difficulties in mounting.
Furthermore, since a mechanism is provided for pressing the coil attached to the coil holding portion when inserting the coil into the outer core, there is no danger of cutting the coil during insertion.

Fifth Embodiment In a fifth embodiment of the coil insertion device shown in FIG. 34, one end of an insertion jig 200 is fixed by a fixing portion 210. The main shaft 20 in which the cam shaft 209 is inserted via the bearing 205
1 is attached. The camshaft 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 mounted, and a sleeve 203 is mounted on the outside thereof via a bearing 204. Therefore, the main shaft 201 and the sleeve 202 are integrated, and can be rotated in the direction of arrow A with respect to the fixed portion 210, and the sleeve 203 can be independently rotated in the direction of B with respect to the main shaft 201 and the sleeve 202.

On the sleeve 202, the first projection 20
6 and the second projection 207 are attached, and can be moved in and out in directions of arrows D and E by a cam shaft 209, respectively.
Further, a step 211 is formed by covering the sleeve 208 from above.

The fifth embodiment is configured as described above. Next, the coil winding operation will be described. FIG. 35 and FIG.
As shown in FIG. 6, the coil 215 is wound while the cam shaft 209 is 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, and the main shaft 201 and the sleeve 202 are synchronized in the direction of arrow A and the sleeve 203 in the direction of arrow B, that is, at the same speed and at the same timing. Rotate. The rotation is stopped when a predetermined number of rotations is reached. The wire W is fused using a self-fusing wire by solvent fusion, hot air fusion, electric heating fusion, or a combination thereof to form the coil 215.

Next, the terminal W2 of the wire W is inserted into the groove 219 of the step 211 of the sleeve 208 and fixed. Thus, the elliptical or oval coil 215 is completed. FIG.
As shown in FIG.
06. Then, the coil 215 tries to contract due to the tension applied to the wire W1 at the time of winding, but is balanced by the elastic force H of the first projection 206 and held 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
5 enter the insertion guide 214, the edge 216 of the first projection 206
7 (see FIGS. 39 and 40). Then, the first protrusion 206 forcibly and gradually starts to be pulled in the direction of arrow D, and at the same time, the coil 215 starts to tilt while entering the insertion guide 214, and the curved surface 220 on the first protrusion 206
And move in the direction of arrow G.

FIG. 39 to FIG. 41 schematically show this state. 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 projection 206 until the coil completely enters the insertion guide 214, and the coil 215 is separated from the gap 221 formed by the sleeve 211 and the sleeve 212. Never.

Further, in the direction of arrow F in FIG.
00 by moving the coil 215 of the outer core 213.
When the position of the gap 221 of the insertion jig 200 is matched, the operation is stopped.

As shown in FIG. 42, when the sleeve 203 is rotated one or more turns in the direction of arrow C, the coil 215
Is inserted into the groove 215 of the outer core 213. What is important in the fifth embodiment is that the sleeve 2
The rotation direction 03 (arrow C) is the same as the winding direction of the coil 215. Thus, the sleeve 203
Is set to be the same as the winding direction of the coil 215, there is no danger that the winding of the coil W will be separated. Otherwise, if sleeve 203
Is set opposite to the winding direction of the coil 215, when the sleeve 203 is rotated, the coil W is restored to a circular shape in the outer core 213 when the fusion force of the winding of the coil W is weak. In this case, the coil W may be separated.

As shown in FIG. 43, the cam shaft 209 is
, The second protrusion 207 is extended in the direction of arrow E, and 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 being removed from the outer core 213 and fixed to the outer core 213, the main shaft 201 and the sleeve 202 are rotated once in the direction of arrow B, that is, once at the same speed and at the same timing, and pressure is applied to the coil to form.

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 camshaft 209 having a sectional shape as shown in FIG. 44 is used. This cross-sectional shape has a so-called irregular shape. This camshaft 209
Is rotated counterclockwise in the direction of arrow D as shown in FIG. 45 from the initial position (see FIG. 44). Camshaft 20
9 protrudes the projection 207 in the direction of the arrow (upward in the drawing).
Thereby, as shown in FIG. 46 and FIG.
The protrusion 207 is further protruded so that the protrusion 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. As described above, the protrusion amount of the projection 207 provided when the elliptical coil is restored to the circular shape in the outer core, and the rotation amount of the insertion jig for pressing the coil against the groove bottom in the outer core are provided. The amount of protrusion is changed.

When the coil is to be restored to the circular shape only by rotating the sleeve of the insertion jig in the outer core, it depends on the rigidity of the coil itself and the degree of sliding of the groove and the coil W in the outer core. I do. For this reason, as illustrated in FIG. 46, a part of the coil does not always completely restore to a circular shape, and there is a possibility that a part of the coil may protrude inward from the groove 215. 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 face of the stopper and cut. However, according to the method of the sixth embodiment as described above, such cutting of the coil W can be completely prevented.

[0057]

As described above, claims 1 and 2 and
According to the invention of claim 4, since the circular coil is deformed into an elliptical shape or an elliptical shape and inserted into the outer core by tilting the coil with respect to the center axis of the outer core, the circular coil is restored to a circular shape. Also, the coil has almost no distortion and can be easily inserted. Then, the elliptical or oval coil can be inserted into the groove to easily restore the circular shape, so that the coil is closely attached to the groove of the coil and does not protrude into the space in the outer core. That is, the insertion and holding state of the coil can be reliably maintained, and the manufacturing accuracy of the rotary transformer is improved.
At the same time, since coil winding is performed on the insertion jig, there is no need for transfer or movement in the coil. For this reason, it is not necessary to separately provide means for transferring or moving the coil in the insertion device, which simplifies the device and eliminates the possibility of inadvertent deformation due to the transfer of the coil. Since the projections projecting during coil winding have elasticity, they serve as a coil presser when inserting the coil, and the outer core of the coil can be stably inserted. According to the invention of claims 3 and 5 , 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 sixth aspect of the invention, when the coil is restored to the circular shape, the coil can be set correctly without winding the coil.

[Brief description of the 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 the rotary transformer.

FIG. 3 is a perspective view showing a coil used in the 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 showing a preferred embodiment of the present invention in which a coil is arranged to be inclined with respect to an outer core.

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

FIG. 7 is a view showing a state in which the inclined coil is inserted into the outer core using the insertion device of the first embodiment.

FIG. 8 is a diagram showing a state in which the insertion shaft of the insertion device of 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 into the groove of the outer core.

FIG. 10 is a view of the first embodiment with the insertion shaft removed.

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

FIG. 12 is a diagram in which a coil is mounted on a sleeve of the insertion device of FIG. 11;

FIG. 13 is a diagram in which a coil moves on a sleeve and is fixed to a distal 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 a coil has entered a groove of an outer core.

FIG. 16 is a diagram showing a state where the entire circumference of the coil has entered the groove of the outer core.

FIG. 17 is a diagram in which an insertion shaft is removed from an outer core and an insertion guide.

FIG. 18 shows a second embodiment of the insertion device of the present invention.

FIG. 19 is an end view of the embodiment of the insertion device of FIG. 18;

20 is a sectional view taken along the line AA in FIG. 19;

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

FIG. 22 is a diagram showing a state where the coil is inserted into the outer core according to the embodiment of FIG. 21;

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

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

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

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

FIG. 27 is a diagram showing a state where the cam shaft is separated from one of the protrusions protruding in FIG. 25;

FIG. 28 is a diagram showing an attempt to insert a coil into the outer core.

FIG. 29 is a diagram showing a state immediately before a coil is inserted into an insertion guide.

FIG. 30 is a view showing a state where a coil is inserted into an insertion guide and one protrusion is pressed inward.

FIG. 31 is a diagram showing a state where the coil has entered the insertion guide.

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

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

FIG. 34 shows an insertion device according to a fifth preferred embodiment of the present invention.

FIG. 35 is a view showing a state in which one projection of the insertion device in FIG. 34 is extended by a cam shaft.

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

FIG. 37 is a view showing a state where the cam shaft is separated from one of the protrusions shown in FIG. 35;

FIG. 38 is a diagram showing an attempt to insert a coil 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 diagram showing a state where the coil is inserted into the insertion guide and one protrusion is pressed inward.

FIG. 41 is a diagram showing a state where the coil has entered the insertion guide.

FIG. 42 is a view showing a state where the coil has entered a 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 view showing a cam shaft and a projection in a sixth preferred embodiment of the present invention.

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

46 is a view corresponding to the position of the cam shaft in FIG. 44,
The figure which shows a mode that some windings of a coil have protruded from the groove of the outer core.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer core 2 Coil groove 5, 215 coil 8 Lead wire 13 Inserting device pushing jig 14 Stopper 20 Inserting guide 30 Inserting jig

Claims (6)

(57) [Claims] 1. An insertion device for inserting a circular coil into a groove formed inside an outer core constituting a rotary transformer, wherein the coil is inclined with respect to a center axis of the outer core so as to be inserted into the outer core. An insertion jig for insertion is provided. The insertion jig includes a protruding member that can freely move in and out and is elastically deformable, and holding means for forcibly holding the protruding member in a protruding 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. The rotary transformer is characterized in that it is inserted into the outer core so that the deformed coil is inserted into the groove formed inside the outer core and restored to a circular shape. Coil insertion device. 2. The projecting member has a curved surface on which the coil slides when the coil is inclined with respect to the center axis of the outer core, and the holding means rotates and inserts and projects the projecting member. Characterized by projecting from the outer periphery of the tool,
A coil insertion device for a rotary transformer according to claim 1 . 3. A cam shaft for driving the projecting member , which is a projection of a jig, wherein the cam shaft has an indeterminate cross-sectional shape, and restores an oval coil to a circular shape in the outer core. The amount of protrusion of the projecting member given at the time and the amount of projecting of the projecting member given when rotating the insertion jig to press the coil against the bottom of the groove in the outer core are changed. Claim 2
4. A coil insertion device for a rotary transformer according to claim 1. 4. An outerco constituting a rotary transformer.
A) In the insertion method of inserting a circular coil into the inside, an elliptical or elliptical deformed coil is created by projecting a projecting member from an insertion jig and winding the coil, and the deformed coil is used as a rotary transformer. Insert the deformed coil into the inside of the outer core to be inserted into the premises formed inside the outer core by inclining with respect to the center axis of the outer core and resisting the elasticity of the protruding member. A coil insertion method for a rotary transformer, characterized by restoring to a shape. 5. An insertion method for inserting a circular coil inside an outer core constituting a rotary transformer, wherein the coil is deformed into an oval shape, and inserted into the outer core while being inclined with respect to a center axis of the outer core. After the coil is restored to a circular shape, the protrusion is projected and the coil is pressed against the groove bottom formed in the outer core. A method for inserting a coil for a rotary transformer, comprising: 6. The coil insertion method for a rotary transformer according to claim 5 , wherein when the coil is restored to a circular shape, the insertion jig is rotated in the same direction as the winding direction of the coil.