JPS58212350A - Manufacture of stator - Google Patents

Abstract

PURPOSE:To improve the productivity of a stator by spraying an end part with ultraviolet curable varnish before shaping a coil end, emitting ultraviolet ray to the varnish to semi-dried state, shaping the end, and then immersing it with the varnish, thereby eliminating bundling with a yarn or the like. CONSTITUTION:A billet-shaped jig 4 is inserted from below into the stator core 2 of semicompleted product 1 to expand the coil end 3b. Then, ultraviolet curable varnish 8 in a storage tank 7 is injected and sprayed to the coil ends 3a, 3b and the inner peripheral surface of the core 2 through an injection hole 6. After the spraying step, ultraviolet ray is emitted by an ultraviolet lamp 13 to a semi- dried state. Subsequently, the coil ends 3a, 3b are shaped by a shaping die 14 in the shaping step, and a finishing varnish 15 is dripped and immersed with the coil ends 3a, 3b. In this manner, it can eliminate the bundling step of coil end with a yarn, thereby improving the productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a method for manufacturing a stator in which fill ends are impregnated with varnish and shaped.

[Technical background of the invention and its problems] For example, in the stator of a motor, it is common to use a low-viscosity coil varnish to impregnate the coil. It was unavoidable that the magnet wire A7 at the end part would fray. For this reason, in the past, when manufacturing a stator, a very troublesome process of binding the coil ends with tape, thread, etc. was required, resulting in poor productivity.

[Object of the Invention] Therefore, an object of the present invention is to make it possible to eliminate the need for the process of binding the coil ends with tape, thread, etc., thereby improving productivity, and to eliminate the risk of damage to the magnet wire at the coil end portion. An object of the present invention is to provide a method for manufacturing a stator that has the advantage of eliminating the problem.

[Summary of the Invention] The present invention involves spraying an ultraviolet curable varnish onto the coil end before shaping the coil end, and making the sprayed ultraviolet curable varnish semi-dry by irradiating it with ultraviolet rays. The coil is characterized in that the coil is impregnated with varnish after the coil end is shaped.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIG.

FIG. 1(a) shows a semi-finished product 1 of a stator of a motor. This semi-finished product 1 is composed of a stator core 2 made of laminated silicon steel plates and a rectangular frame-shaped coil 3 wound around the stator core 2 by being housed in the slot of the stator core 2. In the semi-finished product 1 after winding the coil 3, the lower coil end 3a of the coil 3 is expanded, so there is no problem, but the upper coil end 3b is tilted inward. In order to obtain a narrow mouth state, the coil end 3b is shaped in a temporary shaping process shown in FIG. 1(b). In the above-mentioned temporary shaping step, a bullet-shaped jig 4 is inserted from below into the stator core 2 of the semi-finished product 1 to expand the coil ends 3b. After this preliminary shaping step, a spraying step shown in FIG. 1(C) is performed. 1st. ,
In Figure (C), reference numeral 1.11.11 5 is an airtight container for storing the semi-finished product 1, and has injection holes 6.6 at its upper and lower parts, respectively. Further, 7 is a storage tank containing ultraviolet curing varnish 8, 9 is a pump, 10 is a filter, and 11 is a supply pipe. In the spraying step, the ultraviolet curing varnish 8 in the storage tank 7 is applied to the coil end 3a of the coil 3 through the filter 10, the supply pipe 11 and the injection hole 6.6 in response to the drive of the pump 9.
3b and the inner peripheral surface of the stator core 2. At this time, since the ultraviolet curable varnish 8 has a low viscosity, it easily penetrates between the bundles of magnet wires in the coil ends 3a and 13b.

After such a spraying step, a temporary drying step shown in FIG. 4(d) is performed. That is, in the temporary drying process, the drying chamber 12
By irradiating and drying the semi-finished product 1 stored in the interior with an ultraviolet lamp 13, which is an ultraviolet irradiation device, the ultraviolet curable varnish 8 sprayed on the coil ends 3a and 3b is semi-dry, thereby forming an ultraviolet curable varnish. By increasing the viscosity of the varnish 8, its adhesive properties 1') are increased. After this, in the shaping process shown in FIG. 1(e), the semi-finished product 1
The coil ends 3a and 3b are shaped by the shaping die 14, but in this case, as mentioned above, the adhesiveness of the ultraviolet curing varnish 8 that has penetrated between the magnet wires of the coil ends 3a and 3b is enhanced. Since the magnet wires are in a closed state, the magnet wires are firmly bonded to each other.

After this shaping process, as shown in Figure 1 ([), an impregnation process is carried out in which the coil ends 3a and 3b are drip-impregnated with finishing varnish 15, and then final drying is carried out in a drying process not shown in the figure. By doing so, the semi-finished product 1 is made into a finished product.

According to this embodiment described above, the magnet wires of the coil ends 3a and 3b of the semi-finished product 1 are firmly bonded to each other by the ultraviolet curable varnish 8 through the spraying process, temporary drying process and shaping process. Because it becomes a state,
There is no risk of fraying of the magnet wire at the coil ends 3a, 3b, and the coil ends 3a,
The troublesome process of binding the 31+ with tape, thread, etc. is no longer necessary. Moreover, after the semi-drying process, the ultraviolet curing varnish 8 with a high viscosity adheres to the entire surface of the magnet wire at the coil ends 3a, 3b, and the coil ends 3a, 3b are deformed for shaping. The so-called springback amount when
During this quick shaping process, the coil ends 3a, 3b
When deforming for shaping, there is no need to greatly deform the coil ends 3a and 3b in anticipation of a large amount of springback, and the insulation coating of the magnet wire 7 at the coil ends 3a and 13b may be damaged due to excessive deformation. There is no need to worry about it. In addition, in the spraying process, since the ultraviolet curable varnish 8 can also be sprayed on the inner circumferential surface of the stator core 2, the coil 1 ends 3a, 3b can be sprayed in the impregnation process.
Even when drip impregnation is performed in which only the varnish 15 is impregnated, there is no need to separately perform rust prevention treatment on the inner circumferential surface of the stator core 2.

A second embodiment of the present invention is shown in FIG. 2, and the same effects as those of the first embodiment can be obtained even if the second embodiment is configured like this. That is, this second embodiment differs from the first embodiment only in the spraying process and the temporary drying process. Figure 2 (a
) In the spraying step shown in Fig. 1, the semi-finished product 1 is sprayed with ultraviolet hardening varnish R in the storage tank 16 through the nozzle 17.17 without using the airtight container 5.
In addition, in the first preliminary drying step shown in FIG. 2(b), the semi-finished product 1 is irradiated with ultraviolet rays using an ultraviolet lamp for one day without storing it in the drying chamber 12. be. Further, in FIG. 2(a), 19 is a pump. It goes without saying that the present invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications within the scope of the invention.

[Effects of the Invention] As is clear from the above description, according to the present invention, it is possible to eliminate the need for the process of binding coil ends with tape, thread, etc., thereby improving manufacturability, and it is possible to improve the shaping of coil ends. Effects such as eliminating the risk of damage to the magnet wire at the coil end portion during the process can be achieved.

4. Brief description of the drawings: Fig. 1 is a process explanatory diagram showing a first embodiment of the present invention, and Fig. 2 is a process explanatory diagram showing a second embodiment of the present invention.

In the figure, 1 is a stator, 3a and 3b are coil ends, 8 is an ultraviolet curable varnish, and 13 is an ultraviolet lamp (ultraviolet irradiation device).

Applicant: Tokyo Shibaura Electric Co., Ltd. Agent: Bensokushi Kensuke Norichika (and 1 other person): 11' ! IAI diagram tc+ Figure 2

Claims (1)

[Claims] 1. A spraying process in which an ultraviolet curable varnish that is cured by ultraviolet irradiation is sprayed onto the coil end; a temporary drying process in which the ultraviolet curable varnish sprayed on the coil end is semi-dried using an ultraviolet irradiation device; A method for manufacturing a stator comprising a shaping step of shaping the coil end and an impregnation step of impregnating the shaped coil end with varnish.