JPH0510024B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to preforming or final forming of a coil wound around an iron core of a rotating electric machine.

[Prior art and its problems]

The coil, which is inserted into the slot of the iron core through the insulating material, is preformed and then terminal-treated. Terminal processing is usually done on a linear conveyor,
It consists of multiple steps such as inserting insulation between phases, wiring, connecting leads, and fastening the ends of the coil with strings, etc. After the terminal treatment, the coil is finished molded and insulated with varnish to complete the rotor or stator.

The finishing molding must be as small and precise as possible in order to reduce the outer dimensions of the rotating electric machine as much as possible, to ensure contact during rotation, and to improve penetration and retention of varnish.
On the other hand, it is necessary to apply an appropriate pressing force to avoid damage to the coil insulation due to molding or minute flaws that may cause dielectric breakdown in the future.

In addition, in preforming, although the final shape is not as much formed as in final forming, the end of the coil still inserted in the slot must be shaped into a shape suitable for the next step of terminal treatment. Care must be taken to avoid damage to the insulation. Furthermore, when the coil is inserted by an inserter (automatic coil insertion machine), the tip of the coil in the insertion direction is closed in the inner diameter direction, so an open end forming process is performed to partially form the closed coil end into an almost cylindrical shape. This is preceded by the preforming described above.

Conventionally, for example, in the final forming or preforming of stators, the coil ends or the coils in the slots have been formed manually using spatulas, wooden hammers, etc., while the coil ends have been formed by power press machines that collectively form the inner and outer diameters and heights. For coils in slots, improvements have been made to methods using powered machines to insert jigs into the slots. Similarly, in the case of inserters, machines are also used for open-end forming.

However, even when such equipment and machinery are used, poor insulation or dimensional defects at the ends of the coils as described above sometimes occur, so additional manual work is required, or the coil ends are preoccupied with forming the ends of the slots. There were drawbacks such as the risk of the wedge insulation protruding into the inner diameter of the stator. In addition, since the products to be molded are carried in and out of the conveyor after terminal processing in order to perform final molding, there is a drawback that the conveyor is lengthened and the floor space is increased due to coil end molding, slot molding, and these auxiliary operations. Ta. The same goes for preforming prior to terminal processing, and in particular, in the case of coils attached to inserters, there is a drawback that an open end forming process and a bed for this are required.

When we carefully cut and observe a stator in which poor insulation was discovered after varnish treatment, we found that some of the conductors were bent in a much more complicated manner than others at the ends of the coils and within the slots, and that the conductors crossed and were strongly pressed together. It turns out that there are some cases.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks and aims to fully automate the forming process by eliminating auxiliary manual work, preventing insulation failures, and minimizing and precise dimensions of the coil ends for use in electrical appliances. It is an object of the present invention to provide a continuous forming apparatus for coils, which is expected to minimize the size of the coil and can reduce the conveyor and floor area for forming.

[Key points of the invention]

The continuous coil forming apparatus according to the present invention includes a rotary table that rotates around a vertical axis and has a plurality of insertion seats having the same pitch angle on a pitch circle, on which an iron core wound with a coil is removably placed. a drive device that advances the rotary table at each pitch angle;
A device for shaping the inner and outer diameters of the coil end, a device for forming the height of the coil end, and a device for forming the coil in the slot of the iron core are provided in a vertical direction facing the insertion seat at a position where the rotary table stops, and each of the forming devices is characterized in that the partial forming jig for forming the coil is replaceable.

[Embodiments of the invention]

An embodiment of the invention will be explained based on FIGS. 1 to 5.

These figures relate to preforming including open end forming, and four partial forming operations are performed: open end forming, inner and outer diameter forming, height forming and slot internal forming. The final molding is almost the same as the following example, except that the open end molding is omitted and the dimensions of the jig are slightly different so that the final shape can be achieved.

Now, referring to FIGS. 1 and 2, reference numeral 1 denotes a machine frame, and a rotary table 2 is attached to the machine frame 1 by appropriate means so as to be rotated by a shaft 3. An insertion seat 1 is mounted on the rotary table 2 so that a stator 5 on which a coil 4 is wound is removably fitted.
0 is placed on the pitch circle of 1 with the same pitch angle.

In FIG. 2 showing the top surface of the rotary table 2,
The electric motor 6 is fixed to the inside of the machine frame 1, and the drive roller 7 driven by the electric motor 6 is connected to the rotary table 2.
The rotary table 2 is moved forward to a desired rotation angle, and the positioning block 8 is actuated by a command to lock the positioning roller 9, thereby ensuring accurate movement. There are a plurality of positioning rollers 9, which act to lock each station and maintain the molding time in response to the advancement of the rotary table 2, which will be described later. Note that the rotary table 2 may be rotated by having a highly rigid shaft only at the bottom thereof, and its drive device or stepping device may be an intermittent gear device, a rattle drive system, a servo motor, a step motor, etc. good. In this embodiment, five insertion seats 10 are provided on the rotary table 2, and corresponding to the insertion seats 10, the four partial forming stations A, B, C, and D are provided with open-end forming, which will be described later. A device IN, an inner/outer diameter forming device NG, a height forming device HH, and an in-slot forming device SS are provided in the machine frame 1. Note that the station E is for transporting molded products into and out of the apparatus.

The open end forming apparatus IN at station A will be explained with reference to FIG. 14 is a comb-shaped push-out rod that is biased by an air cylinder 16 under the upper mounting plate 15 of the machine frame 1. 17 is a fin-type inserter that is energized by an air cylinder 18. The comb-shaped pushing rod 14 is urged by the cylinder 18 below while pushing the closed inner diameter of the coil 4 at both ends to a predetermined diameter through the hollow part of the stator 5 provided on the rotary table 2 by the urging of the air cylinder 16. It is fitted with the rising fin-type inserter 17. In this way, the ends of the coil which are significantly closed at both ends are subjected to open-end forming as rough forming. At this time, as shown in the figure, a concave fitting portion 14 provided in each of the comb-shaped pushing rod 14 and the line-shaped inserter 17
A and 17A are fitted with circular side walls 4A and 4B of the coil 4 to prevent the aligned winding layer from collapsing during molding. The comb-shaped pushing rod 14 and the fin-shaped inserter are provided with longitudinal grooves to effectively spread the coil.

Next, the inner and outer diameter forming equipment at station B
NG will be explained with reference to FIG. A cylinder 20 is placed on the upper mounting plate 15 fixed to the machine frame 1,
An intermediate mounting plate 27A is fixed to the tip of the operating rod of the cylinder 20 together with the push rod 22. A mounting plate 30A is fixed to the lower end of the support shaft 26 inserted through the intermediate mounting plate 27A, and the mounting plate 30A is attached to the spring 24.
The intermediate mounting plate 27A is biased in the opening direction to a predetermined dimension by the intermediate mounting plate 27A. Further, the lower end of a guide rod 15A that passes through the intermediate mounting plate 27A and the upper mounting plate 15 is fixed to the mounting plate 30A. The mounting plate 30A is provided with a three-split molding device 23 and a flange portion 30 that are guided by grooves in the radial direction of the mounting plate 30A. The collar portion 30 has a side wall 25 facing the outer periphery of the cylindrical portion of the former 23 . The control body 27 having the slope 28 fixed to the intermediate mounting plate 27A is connected to the flange 3.
A roller 13 provided on the outer diameter portion of the roller 10 is brought into contact with the roller 13.

Now, when the pushing rod 22 is lowered together with the intermediate mounting plate 27A by the cylinder 20, the mounting plate 30A, which is biased by the spring 24, is guided by the guide rod 15A and lowered. When the clamp 11 at the upper end of the guide rod 15A abuts against the stopper 12 provided on the upper mounting plate, the lowering of the mounting plate 30A is stopped. Further, when the cylinder is gradually biased, the push rod 22 and the intermediate mounting plate 27A further descend, so that the push rod 22 is pushed into the tapered hole 23 of the forming machine 23.
A, the three-split molding machine 23 is pushed outward, and the slope 28 of the control body 27 is pressed against the roller 1.
3, the collar portion 30 is compressed inwardly.

Thus, by the above two-stage operation, the former 23 and the side wall 25 are lowered to a predetermined position with respect to the coil 4, and then are pressed between the outer wall OW and the inner wall IW to form the inner and outer diameters of the coil 4. . The coils on the lower side of the stator 5 are also formed at the same time by similar means (not shown). In this way, the shaping of the inner and outer diameters of the coil 4 is completed. When the cylinder 20 is deenergized, these mechanical functions are restored.

Furthermore, the height shaping device at station C
HH will be explained with reference to FIG. 32 is an air cylinder, and an extruder 33 is provided with a flange 33A under an upper mounting plate 15 that is integrated with the machine frame 1.
energize. A lower mounting plate 34 is fixed to the lower end of the guide shaft 35 through the upper mounting plate 15.
Reference numeral 36 designates a sliding rod communicating with the lower mounting plate 34, one of which is provided with a ring body 37 disposed at the collar portion 33A, and the other with a ring body 37 disposed below the lower mounting plate 34. 38 is a circular side wall body, one side is open and the other side is a lower mounting plate 34.
Attach it under the 39 is an inset and a ring body 3
7 and is attached to the bottom of the lower mounting plate 34. Inside the insert 39, a spring 40 that resists repulsion is accommodated under the collar portion 33A. When the air cylinder 32 is energized, the pusher 33 is lowered, and the coil 4 of the stator 5 is inserted between the insert 39 and the side wall body 38. When 34, 38, and 39 are lowered to a predetermined position with respect to the coil 4, they are stopped by a stopper (not shown) provided on the upper part of the guide shaft 35, and only the ring body 37 is further lowered, so that the upper side of the coil 4 is moved to the ring body 37. It is molded to a predetermined height.
During this molding, the inner diameter of the coil 4 is
9, the outer diameter is held between the side wall bodies 38, so that the inner and outer diameter dimensions of the coil 4 are not changed unnecessarily. Incidentally, the coils on the lower side of the stator 5 are also formed at the same time by the same means (not shown) as before. The height shaping is thus completed.

Finally, install the coil in-slot forming device SS into the fifth
This will be explained using figures. 41 is an air cylinder, and the air cylinder 41 penetrates the upper mounting plate 15 and is fixed to the lower mounting plate 50. Further, the extruded rod 42 penetrates the lower mounting plate 50 and inserts a circular inserter 48.
is provided on the outside. 44 connects one side to the lower mounting plate 5
0, and the other is a guide shaft passing through the upper mounting plate 15, which is biased by a cylinder (not shown). 4
Reference numeral 5 designates a molded body in a slot that surrounds the inserter 48 and is open at the bottom, and the other is attached to the lower mounting plate 50. Molded body in slot 4
5 is provided with a plurality of thin blades 46 that are inclined along the outer periphery as shown in the figure.

When the cylinder 41 is energized, as the molded body 45 enters the hollow part of the stator 5, the extrusion rod 42
The inserter 43, which is provided for this purpose, slides from above the inside of the blade 46 and continues to push outward through the wedge 47 of the slot 48 so as to spread it outward, and then descends over the effective length of the slot 48. As a result, the coil in the slot 48 is closely aligned with the wedge 47 and molded, and all molding is completed. Then, when the cylinder 41 is released, the stator is advanced to the next station E.

In this way, the molded stator is taken out at station E, a new stator is placed, and the above-described molding process is repeated again. In stations A to D, each partial molding is performed simultaneously and in parallel. In addition, the comb-shaped extrusion rod 14, the fin-type inserter 17, and the extrusion rod 2 at each station
2. The mold 23 and other jigs can be detachably replaced from the device depending on the type of coil 4.

〔Effect of the invention〕

According to this invention, the following effects can be obtained.

a) The molding equipment can be used for general purposes.

In other words, since the partial forming device is replaceable, it can be used for both preforming and final forming, and even if the partial forming process is changed or the coil design has unnecessary processes in some parts, it can be used for both preforming and final forming. This is a general-purpose molding machine that can be used for various purposes.

b Process time does not become long.

Since each partial forming process operates at the same time as it advances and stops, the process time does not become long.

c Connections with other processes can be shortened.

One insertion seat on the rotary table can be used as a loading/unloading station for this molding device, which shortens the connection to the insert, terminal processing, and varnishing processes, shortens the handling length for loading/unloading, and
Floor space will also be significantly reduced.

d The device is rotary and simple.

Since stepping is performed by a rotary table, the drive and stepping mechanisms are simpler than linear types that use rails or belts.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is a sectional view taken along line X-X in Fig. 1, Fig. 3 is a side sectional view of the inner and outer diameter forming device NG, and Fig. 4 is height forming. Apparatus HH, FIG. 5, is an in-slot forming apparatus. 2... Rotating table, 4... Coil, 5... Stator, 6... Electric motor, 7... Drive roller, 10...
...Insertion seat, IN...Open end forming device, NG...Inside/outside diameter forming device, HH...Height forming device, SS...Slot inside forming device.

Claims (1)

[Claims] 1. A rotary table on which a coil-wound iron core is removably placed and a plurality of insertion seats having the same pitch angle on a pitch circle and rotates around a vertical axis, and this rotary table is rotated in steps at each pitch angle. a drive device for advancing the rotary table, and a device for forming the inner and outer diameters of the coil end, a device for forming the height of the coil end, and a device for forming the coil in the core slot in a vertical direction facing the insertion seat at a position where the rotary table stops, respectively. , a continuous coil forming apparatus characterized in that each of these forming apparatuses has replaceable partial forming jigs for forming the coil.