JPH0357113Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention is for forming the coil end of a coil housed in a slot in a stator core of a rotating electric machine into a predetermined shape and size. In particular, the present invention relates to a stator coil forming device that prevents the coil end of the previous step from getting in the way when inserting the next phase coil.

(Prior art) In the stator of a rotating electric machine, coils are sequentially stored in the slots of the stator core, but at this time, the coil ends of the first inserted coil that protrude from both ends of the stator core are inserted into the next slot. Before inserting the next coil, the coil end is shaped into an open shape using a forming blade so as not to obstruct the insertion of the next coil. This conventional example will be explained with reference to FIGS. 1 to 3. Figure 1 is a front view of the molding device, and Figure 2 is the
FIG. 3 is an enlarged plan view of the main part of the coil end. In the figure,
A bullet-shaped guide 1 is provided at the tip, and the outer periphery of the guide tube 3, which loosely fits into the inner diameter of the stator core 2, has slots 5, 5 in which stator coils 4 for one phase or one pole are housed. A molded blade 6 is formed to be inserted only into the plurality of slots 5a between the two.
This molded blade 6 has a cross section slightly smaller than that of the slot 5, extends parallel to the axial direction, and has an inclined portion with respect to the bullet-shaped guide 1 so that it can be easily inserted into the slot 5a of the stator core 2. . The coil ends 4a and 4b expanded in the radial direction by the forming blade 6 are finally finished into the desired shape and dimensions by means of tapered forming molds 7a and 7b whose outer shape is formed into the required shape. It is pressed from both sides and formed into an open shape.

Next, the molding operation will be explained. First, the stator core 2 containing the stator coil 4 for one phase or one pole is inserted into the guide tube 3. At this time, the molded blades 6 of the guide tube 3 are aligned with the positions of the plurality of slots 5a between the slots 5, 5 in which the stator coils 4 are housed. During this insertion, the coil ends 4a, 4b are expanded in the radial direction at the tip of the forming blade 6. As the insertion progresses further, one coil end 4a is pressed against the mold 7a and formed into an open shape. 11 is a wedge for fixing the coil 4 inserted into the slot 5. Next, the other coil end 4b is formed into an open shape by fitting the mold 7b into the guide tube 3 and sliding it to the left in FIG. 1 to press it.

As shown in FIG. 2, in the conventional forming apparatus, all the forming blades 6 have the same cross-sectional shape and are inserted up to the bottom 8 of the slot 5a, so the coil ends 4a and 4b are inserted near the bottom 8 of the slot 5a. It can be molded up to.

(Problem to be solved by the invention) However, the rising portions 9 of the coil ends 4a and 4b, which are bent in the direction of the outer diameter of the stator core 2, are suddenly bent to a nearly right angle at the tip of the forming blade 6 adjacent from the inside. It will be done. This tendency becomes particularly strong when the stator core 2 has a large number of slots and the width between the slots is narrow, or when the slots 5 are deep. In addition, the coil ends 4a, 4b are slid in the axial direction while being pressurized by the tip of the forming blade 6. As a result, the coil ends 4a, 4 are bent at a steep angle as shown in FIG.
In case b, scratches occurred at the bent portions, resulting in a decrease in insulation function. Furthermore, it is desirable to make the average winding length of the stator coil 4 as short as possible in order to improve the motor characteristics, but in the case of the shaped blade 6 having the above shape, the average winding length of the coil 4 is shortened. Then, the rising portions 9 of the coil ends 4a, 4b are molded up to the bottom 8 of the slot 5, so that the slot insulator containing the stator coil 4 inscribed in the molded blade 6 adjacent to the rising portion 9, as shown in FIG. 10 had the disadvantage that it was easily damaged at the end face of the stator core 2 by being pushed by the coil end 4a.

The present invention was made in order to solve the above problems, and aims to provide a stator coil forming device that prevents the coil ends from being damaged and allows easy insertion of the next phase coil. be.

[Structure of the idea]

(Means for Solving the Problems) The stator coil forming device of the present invention includes a cylindrical guide tube that fits into the inner diameter of the stator core, and a cylindrical guide tube that is provided radially in the axial direction on the outer circumference of the guide tube. It consists of a rib-shaped molded blade that is inserted into a slot where no coil is inserted to expand the coil end, and a pair of coil end molds that are fixed at one end of the guide tube and are slidable from the other end. The present invention is characterized in that the radius of curvature of the portion of the molded blade that contacts the coil, which is inscribed in the rising portion of the coil end, is increased.

(Function) In the stator coil forming device of the present invention, by increasing the radius of curvature of the portion of the forming blade that contacts the coil, which is inscribed in the rising portion of the coil end, Since the parts are not bent sharply, there is no reduction in the insulation of the stator coil, and no damage to the coil is caused. Furthermore, it is also possible to prevent the slot insulator located inside the stator coil from being damaged by the end face of the core.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 4 to 7. It should be noted that the same parts as those in the prior art described above are given the same reference numerals and detailed explanations will be omitted. Fourth
The figure is a front view of the main part of the stator coil forming device, FIG. The figure is an enlarged plan view of the main parts of the coil end. In the figure,
The guide tube 3 is provided with a bullet-shaped guide 1 at its tip to facilitate insertion into the stator core 2, and the inner diameter of the stator core 2 is loosely fitted to the outer periphery of the guide tube 3. A molded blade 6 is formed to be inserted only into a plurality of slots 5a located between the slots 5, 5 in which stator coils 4 are housed. The shaped blade 6 has two types of shapes, and the shaped blade 6 is inserted into the inner slot 5a adjacent to the rising portion 9 of the stator coil 4.
A is formed so that the outer periphery of the portion in contact with the rising portion 9 of the stator coil 4 has a large radius of curvature. Therefore, the height of the shaped blade 6a formed by this radius of curvature is reduced. Further, the other molded blades 6 are the same as the conventional ones, and have a shape that is substantially the same as the slot 5 and a height up to the bottom 8 of the slot 5a. These molded blades 6, 6a extend parallel to the axial direction of the guide tube 3, and are provided with an inclined portion so as to be easily inserted into the slot 5a of the stator core 2 relative to the bullet-shaped guide 1. In order to finally finish the coil ends 4a, 4b expanded in the radial direction by the forming blades 6, 6a into the desired shape and dimensions, forming molds 7a, 7b are placed on both sides of the guide tube 3 as shown in FIG. One mold 7a is fixed to one end of the guide tube 3, and the other mold 7b is inserted into the guide tube 3 so that it can slide freely on its outer peripheral surface and be moved by a drive device (not shown). establish. The molds 7a and 7b are fitted with the guide tube 3 and the molding blades 6 and 6a on the inner diameter side, and are tapered to form the shape required for forming the coil ends 4a and 4b on the outer diameter side. There is.

Next, the operation of the molding apparatus configured as described above will be explained. First, the stator core 2 containing the stator coil 4 for one phase or one pole is inserted into the outer periphery of the guide tube 3 by operating a drive device (not shown). At this time, the molded blades 6, 6a of the guide tube 3 are aligned with the positions of the plurality of slots 5a in which no coils have been inserted yet, which are between the positions of the slots 5, 5 in which the stator coils 4 are housed. During this insertion, the coil ends 4a, 4b are expanded in the radial direction at the tips of the forming blades 6, 6a. As the insertion progresses further, one coil end 4a is pressed against the mold 7a and formed into an open shape. Next, the other coil end 4b is formed into an open shape by fitting the mold 7b into the guide tube 3 and sliding it to the left in FIG. 4 to press it. This allows the fifth
As shown in the figure, since the shaping blade 6 is inserted up to the bottom 8 of the slot 5a in the center of the coil end 4a, the coil end 4a is shaped up to nearly the bottom 8 of the slot 5. Further, the coil end 4b can also be molded in the same manner. However, since the rising portions 9 of the coil ends 4a, 4b in the outer radial direction of the stator core 2 are formed by the inscribed forming blades 6a, they are formed halfway to the bottom 8 of the slot 5, but the forming blades 6
Due to the shape of a, the radius of curvature of the portion of the coil end 4a, 4b that abuts against the rising portion 9 is large, so that it will not be bent at a steep angle. Especially stator core 2
The effect of this large radius of curvature is great for devices with a large number of slots or when the depth of the slot 5 is deep. Therefore, the stator coil 4 will not be damaged and its insulation function will not deteriorate. Next, when inserting the stator coil of another phase, the cross-sectional area of the molded blade 6a is 70 to 80% of the cross-sectional area of the slot 5a, as shown in FIGS. bottom 8
Since the molding blade 6 is inserted close to the
The previously formed coil 4 does not get in the way. Furthermore,
The bottom part 8 of the upper slot 5 allows the dimension of the molded blade 6a in the slot depth direction to be sufficiently lower than that of the slot 5 even if the average winding length of the stator coil 4 is somewhat shortened.
Since the radius of curvature of the tip of the forming blade 6a that comes into contact with the rising part 9 of the coil 4 is increased, the rising part 9 of the stator coil 4 formed after stator coil storage is not pulled, and the stator The slot insulator 10 located inside the coil is not damaged at the end face of the stator core 2, as shown in FIG.

[Effect of idea]

As described above, according to the present invention, the rising portion of the coil end that protrudes from the end face of the stator core is not bent suddenly, so there is no reduction in the insulation of the stator coil, and there is no damage to the coil. Furthermore, even if the average winding length of the coil is somewhat shortened, the rising part of the stator coil will not be stretched, so the slot insulator located inside the stator coil will not be damaged by the end face of the iron core. This has the effect of improving the reliability of the rotating electric machine.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional stator coil forming device, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is an enlarged plan view of the main part of the coil end by the conventional forming device. 4 is a front view of a stator coil forming apparatus showing an embodiment of the present invention, FIG. 5 is a sectional view taken along the line - in FIG. 4, and FIG. 6 is a main view of FIG. 5. FIG. 7 is an enlarged plan view of the main part of the coil end by the stator coil forming apparatus of the present invention. 1... Bullet-shaped guide, 2... Stator core, 3...
...Guide tube, 4...Coil, 4a, 4b...Coil end, 5...Slot, 5a...Slot in which the coil is not inserted, 6, 6a...Forming blade, 7a, 7b...Forming mold, 8 ...Bottom of the slot, 9...Rising part of the coil, 10, 10a...
End of slot insulation.

Claims (1)

[Scope of utility model registration request] One phase or one pole of coil is inserted into the slot of the stator core, and the coil end of the stator coil is formed into an open shape. , a rib-shaped molded blade that is radially provided in the axial direction on the outer periphery of the guide tube and is inserted into a slot in which the coil is not inserted to expand the coil end; and a rib-like molded blade that is fixed at one end of the guide tube and the other end In a stator coil forming device comprising a pair of coil end forming molds that are freely slidable from the above, the forming blades include:
A stator coil forming device characterized in that the radius of curvature of the portion of the forming blade inscribed in the rising portion of the coil end that contacts the coil is increased.