JPH0376103B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method and apparatus for forming a stator coil for a rotating electric machine.

[Technical background of the invention and its problems]

In general, the stator of a three-phase rotating electrical machine has a slot 15 in a stator core 10, for example, as shown in FIG.
It houses a U-phase coil 14U, a V-phase coil 14V, and a W-phase coil 14W.

The stator coil is molded, for example, by a molding device as shown in FIG. That is, numeral 1 in the figure is a machine stand, and a core holder 4 is provided on the machine stand 1. Further, a coil forming jig 3 is provided at a position facing the core pedestal 4, and further,
A coil insertion jig 2 is provided parallel to the coil forming jig 3. The core pedestal 4 is a slide bar 5
It is placed movably on top and moves in the direction of arrow 6. On the other hand, the coil insertion jig 2 and the coil forming jig 3 are mounted on the machine base 1 via a slide bar 8 that faces the core holder 4 and can move in the direction of an arrow 7. and the coil forming jig 3 are integrated via a base 9 so as to slide simultaneously. Further, the forming jig 3 is used to form the coil end 11 of the stator core 10.
It has an extension piece 13 divided into a plurality of parts at a portion located at .

Therefore, when forming the coil 14, first, with the coil forming jig 3 in the position shown by the two-dot chain line in FIG.
4 onto the coil insertion jig 2, and insert the coil 14 into the stator core 10 of the core holder 4. Thereafter, the base 9 is moved until the coil forming jig 3 reaches the position shown by the solid line in FIG. Subsequently, the core pedestal 4 is moved in the direction of the arrow 6 to fit the stator core 10 into the coil forming jig 3. On the other hand, the expansion mechanism (not shown) of the coil forming jig 3 is activated to expand the expansion piece 13 to form the coil end 11.
to form. During this coil forming operation, the operator transfers the coil 14 to the coil insertion jig 2 in the same manner as described above in order to insert the next coil. The above operations are repeated multiple times depending on the number of coils to complete the coil insertion, molding, and work for one machine.

By the way, conventionally, as shown by the two-dot chain line in FIG. 3, the expansion piece 13 smaller than the inner diameter of the stator core 10 is radially expanded to the position shown by the solid line by the operation of an expansion mechanism (not shown), and the coil end 11 is pushed and expanded to the outer diameter of the stator core 10.

However, since this expansion piece 13 expands radially, the slot 15a adjacent to which the coil 14 is inserted is not completely formed. This slot 1
When the coil 14 was inserted into the coil 5a, the insertion resistance became so large that the coil 14 could not be inserted in some cases.

In addition, there were cases where a part of the coil 14 during molding got caught in the space between adjacent expansion pieces 13 that expanded radially, causing damage to the coil 14. In order to prevent this, it is possible to increase the number of extension pieces 13, but this
The holding mechanism becomes complicated, and gaps still exist between adjacent expansion pieces 13 when expanded, and the number of gaps further increases, resulting in frequent jamming phenomena.

Furthermore, it is necessary to change the forming position and the amount of expansion of the expansion piece 13 depending on the insertion position of each phase coil 14U, 14V, 14W. The mounting position had to be adjusted, which resulted in a complicated structure and increased costs.

[Purpose of the invention]

The present invention has been made focusing on the above circumstances,
The purpose of this is to reduce coil insertion resistance and improve quality by eliminating coil jamming, and to simplify the structure of the coil forming jig, making it easier to adjust when changing the lamination of the stator core. It is an object of the present invention to provide a method for forming a stator coil and an apparatus therefor.

[Summary of the invention]

The present invention is a method and an apparatus for forming coil ends by sequentially inserting coils of each phase into slots of a stator core, and inserting forming blades into slots in which no coils have been inserted each time. .

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIGS. 4 to 6. Note that the same parts as those shown in FIGS. 1 to 3 are designated by the same numbers, and the explanation thereof will be omitted. A feed screw 16 is provided at the bottom of the core pedestal 4, and the feed screw 16 is connected to a motor (not shown). A feed screw 8 for moving the base 9 is provided at the bottom of the base 9, and the feed screw 8 is driven by a motor 18. On the other hand, the coil forming jig 3 has a jig main body 3a inserted into the stator core 10 as shown in FIG. are combined and protruded. The shaping blades 19 are inserted into the slots 15, and the number of shaping blades 19 is the same as the number of slots 15 into which the U-phase coils 14U are inserted. Further, as shown in FIG. 5, a mold 20 for spreading the coil end 11 is provided at the mounting portion of the coil forming jig 3. As shown in FIG.
Then, the main body 3a of the coil forming jig 3 described above,
The molding blade 19 and the mold 20 are configured to be rotatable at any angle by means of a rack and pinion (not shown).

Next, the operation of the above embodiment will be explained. First, the stator core 10 is attached to the core pedestal 4 by hand. On the other hand, the coil 14 wound in a separate process is manually transferred to the coil insertion jig 2. After this transfer, the motor 18 is operated to rotate the feed screw 17, and the coil insertion jig 2 and coil forming jig 3 are integrally moved in the direction of the arrow 7 on the slide bar 8 to two points. It will stop at the position indicated by the chain line. Then, by operation of a motor (not shown), the feed screw 16 is rotated to move the core holder 4 in the direction of the arrow 6, fit into the coil insertion jig 2, and stop. Next, the coil 14 is inserted into the slot 15 of the stator core 10 using the coil insertion jig 2. When the insertion of the coil 14 is completed, the core pedestal 4 is moved in the opposite direction, the stator core 10 is removed from the coil insertion jig 2, and at the same time the coil forming jig 3 is moved together with the coil insertion jig 2 in the same manner as above. By the reverse operation, it is moved laterally to the position indicated by the solid line in FIGS. 4 and 5. The coil forming jig 3 drives a rack (not shown) to rotate a pinion,
The front part is also rotated so that the positional relationship with the stator core 10 is as shown by the two-dot chain line in FIG. After the coil forming jig 3 moves in the horizontal direction, the core pedestal 4 moves forward in the vertical direction toward the coil forming jig 3, and the stator core 10 is fitted into the coil forming jig 3, as shown in FIG. The coil end 11 located in the slot 15 shown by the two-dot chain line is molded. Next, iron core cradle 4
is moved backward in the direction of arrow 6, the pinion is rotated by driving a rack (not shown), and the core holder 4 is placed in the coil forming jig so that it is in the positional relationship with the stator core 10 shown by the solid line in FIG. When the stator core 10 is fitted into the coil forming jig 3, the forming blade 19 is inserted into the slot 15 of the stator core 10 as shown by the solid line in FIG.
The coil end 11 will be molded.

During this forming operation, the operator transfers the next phase coil 14V to the coil insertion jig 2 in preparation for the next coil insertion.

The above-mentioned operations are repeated to complete the coil insertion molding work for one machine, but the V-phase coil 14V only needs to be molded in the slot 15 shown by the two-dot chain line in FIG.

In this way, at the stage of inserting the next phase coil after inserting the first phase coil into the slot of the stator core, a plurality of forming blades (two in this example) to be inserted into the slot for inserting the final coil are inserted into the coil-free slot. The third phase of insertion is inserted into the insertion slot to form the coil end. These two expansion moldings ensure that the coil end is expanded to the bottom of the slot for inserting the next phase coil, so that the next phase coil can be easily inserted with low insertion resistance. Then, the plurality of forming blades for inserting the final coil into the corresponding slot expand the already inserted coil end by inserting and removing the forming blades of the corresponding slot before inserting the coil into the corresponding slot for final coil insertion. The number is selected for open molding.

Therefore, since the number of forming blades is the same as the number of slots for final coil insertion, the number of shaping blades can be reduced, and the jig main body can be simplified, resulting in an inexpensive device.

In the above-mentioned embodiment, the coil forming jig 3 is configured to be rotatable, but the present invention is not limited to this, and the stator core 10 of the pedestal 4 may be rotated by any angle.

〔Effect of the invention〕

As explained above, the present invention forms the coil end using a plurality of molded blades inserted into the slot for inserting the final coil, thereby expanding the coil end to the bottom of the slot for inserting the next phase coil. The resistance to inserting the coil into this slot is reduced and the coil can be easily inserted. In addition, the number of forming blades is small, and the jig body and thus the winding forming apparatus can be manufactured at low cost. Furthermore, unlike the conventional method, there is no biting phenomenon when using an expansion piece, and there is no occurrence of scratches, resulting in improved quality. Also, rotate the jig body to the insertion position of each phase coil.
It only needs to be molded twice, making adjustment and setup work easier. In addition, even if the stacking thickness of the stator core changes, it is only necessary to provide a sufficient length of the formed blade in advance, and there are many benefits such as no adjustment required, the structure can be simplified, and costs can be reduced. It is something that plays.

[Brief explanation of drawings]

Fig. 1 is a layout diagram of a stator coil of a three-phase rotating electric machine, Fig. 2 is a plan view showing a conventional rotor coil forming device, Fig. 3 is an explanatory drawing showing the forming of the coil end, and Fig. 4 6 to 6 show one embodiment of the present invention, FIG. 4 is a front view showing a stator coil forming device, FIG. 5 is a plan view thereof, and FIG. 6 is a view showing forming of the coil end. It is an explanatory diagram. 3a... Jig body, 4... Core cradle, 10...
Stator core, 11... Coil end, 15... Slot, 19... Molded blade.

Claims (1)

[Scope of Claims] 1. Three-phase coils are inserted into a plurality of slots formed on the inner circumferential surface of a stator core of a rotating electrical machine in multiple steps, and the coil ends are shaped using a blade. In the method, the first phase coil is inserted into the first phase insertion slot in the slot, and then the forming blade is inserted into the third phase insertion slot to form the coil end, and then the coil end is formed. A method for forming a stator coil, the method comprising: taking out a coil end, and then rotating a jig main body or an iron core to insert the forming blade into a slot for inserting a second phase, thereby forming a coil end. 2. An iron core that supports the stator core in a rotary electric machine in which coils are inserted in multiple slots in three phases into a plurality of slots formed in the inner circumferential surface of a stator core, and the coil ends are formed. a cradle, a jig body that is inserted into and removed from the stator core, and a moving mechanism that reciprocates the core cradle or the jig body to insert and remove the jig body from the stator core. , a plurality of molded blades that protrude in the axial direction on the outer peripheral surface of the jig body and are inserted into corresponding slots when the jig body is inserted into the stator core; and the stator core or the jig. A stator coil forming apparatus comprising: a rotation mechanism for rotating a main body to select a slot position into which the forming blade is inserted. 3. The stator coil forming apparatus according to claim 2, wherein the number of forming blades is the same as the number of slots into which the coils are inserted in the final step.