JPH077898A - Rotor of induction motor and metal mold for use in manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent melted resin from extending to a nonfilling space by forming a flat circular projection on an end face of a secondary conductor, securing a caster rotor, composed of the secondary rotor and an iron core, and a rotary shaft in a lower die, and placing an upper die thereon with the bottoms face of the upper die in contact with the projection. CONSTITUTION:A flat circular projection 22 is formed on the end face 12a of the secondary conductor 16 of a caster rotor that is composed of an iron core 14 and the secondary conductor 16. The caster rotor and the rotary shaft are secured in a lower die 24, and an upper die 26 is placed thereon with its bottom face 26a in contact with the top of the projection 22. Thus resin 20 poured into a filling space 27 is stopped in the circular projection 22 and prevented from flowing to a non-filling space 28. This prevents the occurrence of burrs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of an induction motor and a mold used for manufacturing the rotor.

[0002]

2. Description of the Related Art As shown in FIG. 4, in a rotor 100 of an induction motor, in order to fix a caster rotor 112 having a secondary conductor 116 and an iron core 114 integrated with a rotary shaft 118, a resin is conventionally used. Some are integrally molded with 120.

As shown in FIG. 5, in the method of manufacturing the rotor 100, the caster rotor 112 and the rotating shaft 11 are provided in the lower mold 124 of the molds including the upper mold 126 and the lower mold 124.
8 is fitted and the upper die 126 is put on it. Then, a space (hereinafter referred to as a filling space) for pouring and filling the resin 120 formed between the upper mold 126 and the lower mold 124 1
The caster rotor 112 and the rotary shaft 118 are integrally molded into the caster 27 by pouring the molten resin 120.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the manufacturing method of No. 00, when the caster rotor 118 has a variation in dimension, as shown in the enlarged vertical sectional view of the main part of FIG. 6, a slight gap is generated between the secondary conductor 116 and the upper die 126. 131 is formed, and the resin 12 is placed in a space 128 in which the resin 120 is not poured (hereinafter referred to as a non-filled space) 128.
There are cases where 0 flows in and burr occurs.

In view of the above problems, the present invention provides a rotor for preventing resin from flowing out to an extra portion of the rotor and a mold used for manufacturing the rotor.

[0006]

According to a first aspect of the present invention, there is provided a rotor for an induction motor in which a rotating shaft is integrated with a secondary conductor and an iron core by resin. One end face is provided with a projected ridge of a planar ring shape.

The mold used for manufacturing the rotor of the induction motor according to claim 2 of the present invention is used when integrally molding the rotating shaft with resin on the secondary conductor and the iron core of the rotor of the induction motor. A mold comprising an upper mold and a lower mold, wherein a partition wall is provided at a position between a resin filled space and a non-filled space on one of the surfaces where the upper mold and the lower mold face each other. It was done.

[0008]

[Operation] According to the rotor of claim 1, the caster rotor and the rotating shaft, each of which is composed of the secondary conductor and the iron core, are fixed to the lower mold, and the upper mold is covered therewith. In this case, since the end face of the secondary conductor has a projecting ring of a planar ring, the lower surface of the upper die is brought into contact with this projecting line. In this state, the molten resin is poured into the filling space. The molten resin hits the ridge and does not flow into the non-filled space. Therefore, burrs unlike the conventional manufacturing method do not occur.

According to another aspect of the present invention, there is provided a mold used for manufacturing an induction motor, wherein one of the molds is fixed to the caster rotor and the rotary shaft, and the other mold is covered. In this case, since the partition wall is projected on either the upper mold or the lower mold, the partition wall is brought into contact with the surface of the opposing mold. Therefore, the resin poured into the mold is not blocked by the partition wall and flows out into the non-filled space, and no burr is generated.

[0010]

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

FIG. 1 is a vertical cross-sectional view of the rotor 10.
Reference numeral 12 is a caster rotor including an iron core 14 and a secondary conductor 16. The end face 12a of the secondary conductor 16 has a planar annular projection 22 protruding therefrom. The height of the ridge 22 is 0.5 mm to 1 mm. Reference numeral 18 denotes a rotary shaft arranged at the center of the caster rotor 12, which is fixed to the caster rotor 12 by the resin 20.

A method of manufacturing the rotor 10 having the above structure will be described.

As shown in FIG. 2, the caster rotor 12 and the rotary shaft 18 are fixed to the lower mold 24 as in the conventional case.
Cover the upper mold 26. In this case, the lower surface 26a of the upper mold 26
Then, the upper end of the ridge 22 is brought into contact with. As a result, the filling space 27 and the non-filling space 28 are partitioned. Then, the molten resin 20 is poured into the filling space 27. The poured resin 20 is blocked by the protrusions 22 as described above and does not flow out into the non-filled space 28, and burr does not occur.

FIG. 3 shows a second embodiment of the rotor 10, which is different from the first embodiment in that the protrusion 22 is not provided on the end face of the secondary conductor 16 but the lower surface of the upper mold 26. 26a is provided with a ridge 30.

As a result, when the upper die 26 is put on the lower die 24, the lower end of the protrusion 30 abuts on the end face of the secondary conductor 16 to partition the space between the filling space 27 and the non-filling space 28. ,
No burr occurs.

[0016]

As described above, in the rotor according to the first aspect of the present invention, the protrusion allows the molten resin to be prevented from flowing out of the filling space, and the burr does not occur.

In the mold used for manufacturing the rotor of the induction motor of claim 2, since the partition wall provided in the upper mold or the lower mold partition between the filling space and the non-filling space, the non-filling is performed. Resin does not flow out into the space and burrs do not occur.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotor showing a first embodiment of the present invention.

FIG. 2 is likewise an enlarged vertical sectional view of a main part.

FIG. 3 is an enlarged vertical sectional view of a main part of the second embodiment.

FIG. 4 is a vertical sectional view of a conventional rotor.

FIG. 5 is a vertical cross-sectional view showing a method for manufacturing a conventional rotor.

FIG. 6 is likewise an enlarged vertical sectional view of an essential part.

[Explanation of symbols]

 10 Rotor 12 Caster Rotor 14 Iron Core 16 Secondary Conductor 18 Rotating Shaft 20 Resin 22 Projection 24 Lower Mold 26 Upper Mold 27 Filling Space 28 Non-filling Space

Claims (2)

[Claims] 1. A rotor of an induction motor in which a rotating shaft is integrated with a secondary conductor and an iron core by a resin, and a projection of a planar circular ring is provided on either end face of the secondary conductor. Induction motor rotor characterized by. 2. A mold comprising an upper mold and a lower mold used when integrally molding a rotating shaft with a resin on a secondary conductor and an iron core of a rotor of an induction motor, the upper mold and the lower mold. A mold used for manufacturing a rotor of an induction motor, in which a partition wall is provided at a position between a space filled with resin and a space not filled with resin on one of the surfaces facing the lower die. .