JPH05122912A - Manufacture of cage type rotor - Google Patents

Abstract

PURPOSE:To produce a cage type rotor, without leaving vacant holes within a secondary conductor and without leaving spaces at each corner between the secondary conductor and slot. CONSTITUTION:A secondary conductor piece 13 is loaded into a slot hole 12 for every sheet of a core component plate 11. After this core plate 11 is laminated or it is laminated and a skew is applied thereto, the elements are heated to couple the secondary conductor piece 13 through the melting. Thereafter, these elements are hardened. In this case, since the secondary conductor 13 is initially loaded into the slot hole 12 for each sheet of the core plate 11, the interior of the secondary conductor is hardened in the dense condition. Moreover, the entire part of slot is filled with the secondary conductor almost without clearance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a squirrel-cage rotor, which is an improved method for filling a secondary conductor.

[0002]

2. Description of the Related Art Conventionally, in a squirrel cage rotor, as shown in FIG. 4, iron core base plates 1 are stacked, and then, generally, the positions of the slot holes 2 are changed in order to improve electrical characteristics. Each iron core sheet 1 is skewed little by little in the circumferential direction, and then aluminum or copper is cast into each row of the slot holes 2 (each slot 3) to further solidify the two. The next conductor 4 is formed, and at the same time, the end ring portion 5 is formed.
It is manufactured by a method of forming.

[0003]

However, in the method of manufacturing as described above, holes peculiar to casting, so-called "voids", are formed inside the secondary conductor 4, which causes heat transfer. Is not sufficient, or the cross-sectional area of the secondary conductor 4 is not sufficiently obtained, so that there is a problem that electrical characteristics are not sufficiently obtained.

Further, in the skewed type, a space 6 remains at each corner between the stepped slot 3 and the secondary conductor 4, and due to this space 6, heat transfer similar to that described above. There was a problem that the electrical characteristics could not be sufficiently obtained due to the lack of degree and the cross-sectional area of the secondary conductor 4.

The present invention has been made in view of the above circumstances, and therefore an object of the present invention is to leave no holes inside the secondary conductor and to add a slot and a secondary conductor in the case where the secondary conductor is skewed. It is an object of the present invention to provide a method for manufacturing an excellent cage rotor, which can be manufactured in good condition without leaving a space in each corner between and.

[0006]

In order to achieve the above object, in the method of manufacturing a squirrel cage rotor of the present invention, a secondary conductor piece is loaded into the slot hole for each of the iron core base plates,
After the iron core element plates are laminated or laminated and skewed, the secondary conductor pieces are melt-bonded by heating and then solidified.

[0007]

According to the above means, the secondary conductor pieces are loaded into the slot holes from the beginning for each of the iron core element plates, and the secondary conductor pieces are heated after being laminated or after being laminated and skewed. Since it is melt-bonded by, and then solidified, the inside of the secondary conductor is solidified in a dense state, and
All of the slots are filled with the secondary conductor with almost no space.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the method of the present invention will be described below with reference to FIGS.

First of all, FIG. 1 shows one iron core element plate 11, into which a slot 13 is filled with a secondary conductor piece 13 made of aluminum, copper or the like. In this case, for example, the secondary conductor pieces 13 may be placed on the iron core plate 11 and punched at the same time, and the punched secondary conductor pieces 13 may be directly loaded into the lower slot holes 12. To do.

Next, the required number of iron core element plates 11 having the secondary conductor pieces 13 loaded in the slot holes 12 are laminated to form the slots 14 shown in FIG.

Thereafter, the secondary conductor piece 13 is melted and bonded by heating while applying pressure from the outside.
As a result, the secondary conductor piece 13 becomes the secondary conductor 15.
However, in this case, it is necessary that the melting temperature of the secondary conductor piece 13 be lower than the melting temperature of the iron core element plate 11.

After that, the secondary conductor 15 is solidified.

The end ring portion 16 is also shown in FIG. 2, which is heated at the same time when the secondary conductor piece 13 is melt-bonded to be melt-bonded, or the secondary conductor 15 is solidified. After that, they are integrated with the secondary conductor 15 by welding or the like.

According to the above-mentioned manufacturing method, the secondary conductor pieces 13 are loaded in the slot holes 12 for each of the iron core element plates 11, and the secondary conductor pieces 13 are laminated and heated to be melt-bonded to each other. Since the secondary conductor 15 is formed and then solidified, the interior of the secondary conductor 15 is solidified in a dense state.

Therefore, no holes (voids) are left inside the secondary conductor 15 as in the case of conventional casting, whereby heat transfer can be sufficiently performed and the cross-sectional area of the secondary conductor 15 is sufficient. It is possible to obtain sufficient electric characteristics.

FIG. 3 shows a different embodiment of the present invention, in which the core holes 11 with the secondary conductor pieces 13 loaded in the slot holes 12 are laminated, and the positions of the slot holes 2 are arranged one by one. Is formed so that the diagonal slot 17 is formed by gradually shifting in the circumferential direction, the secondary conductor piece 13 is melt-bonded, and the end ring portion 16 is further integrated. In this case, since all of the slots 17 are filled with the secondary conductors 18 with almost no space, there is no space left at each corner between the secondary conductors 18 and the slots 17 as in the conventional case. It is possible to obtain good electrical characteristics of

[0017]

The present invention is as described above,
It has the following effects.

In the squirrel cage rotor manufacturing method according to the first aspect of the invention, the secondary conductor pieces are loaded in the slot holes for each of the iron core element plates, and the iron core element plates are laminated and then heated. Since the secondary conductor pieces are melt-bonded and solidified after that, the inside of the secondary conductor can be solidified in a dense state and can be manufactured without leaving voids. Both the cross-sectional areas of the secondary conductors can be made sufficient, and sufficient electrical characteristics can be obtained.

In the squirrel-cage rotor manufacturing method according to the second aspect of the present invention, the secondary conductor pieces are loaded in the slot holes for each of the iron core element plates, and the iron core element plates are stacked and skewed. After that, since the secondary conductor pieces are melt-bonded by heating and then solidified, no holes are left inside the secondary conductor, and further, each corner between the secondary conductor and the slot is left. It is possible to manufacture without leaving a space in the part, and in this case as well, both the heat transfer and the cross-sectional area of the secondary conductor can be made sufficient, and sufficient electrical characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of one iron core element plate showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of main parts

FIG. 3 is a view corresponding to FIG. 2 showing a different embodiment of the present invention.

FIG. 4 is a view corresponding to FIG. 2 showing a conventional example.

[Explanation of symbols]

Reference numeral 11 is an iron core element plate, 12 is a slot hole, 13 is a secondary conductor piece, 14 is a slot, 15 is a secondary conductor, 17 is a slot, and 18 is a secondary conductor.

Claims (2)

[Claims] 1. A secondary conductor piece is loaded into a slot hole for each of the iron core element plates, the iron core element plates are laminated, and then the secondary conductor pieces are melt-bonded by heating, and thereafter, A method for manufacturing a squirrel-cage rotor characterized by solidifying. 2. A secondary conductor piece is loaded in each slot hole of each iron core element plate, the iron core element plates are stacked, skewed, and then heated to melt-bond the secondary conductor elements. A method of manufacturing a squirrel-cage rotor, wherein the method is performed and then solidified.