JPH03143250A - Rotor of dynamo-electric machine - Google Patents

Abstract

PURPOSE:To reduce stress and also to enable the maximum stress to be sought accurately even in calculation by providing a stress relaxing groove at the fitting end between a rotor iron core and an arm. CONSTITUTION:A stress relaxing groove 5 is provided at the inside periphery of a rotor iron core 3, and besides it is arranged at the position adjacent to the fitting part 4 with an arm 2. By having installed the stress relaxing groove 5 at the fitting part 4 between the rotor iron core 3 and the arm 2, the structure form becomes smooth. For this reason, it becomes gentle stress distribution without peak-shaped high stress occurring at the fitting face end. Moreover, since the coupling form between the rotor iron core 3 and the arm 2 becomes smooth, the maximum stress can be sought accurately by the analysis using a finite element method, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotor for a rotating electrical machine, and particularly to a rotor suitable for a motor that is subjected to repeated centrifugal force due to variable speed, such as a motor for a rolling mill. .

[Conventional technology]

FIG. 3 is a cross-sectional view of a conventional rotor disclosed in, for example, Japanese Patent Application Laid-open No. 54-48008, and FIG. 4 is a stress distribution diagram of the fitting part iron core. In the figure, 1 is a rotating shaft, 2 is an arm radially fixed to the rotating shaft, 3 is a ring-shaped rotor core, and 4 is a fitting portion between the arm 2 and the core 3.

The rotor core 3 is integrated with the rotating shaft l to which the arm 2 is fixed by shrink fitting, press fitting, etc., and transmits torque.

[Problem to be solved by the invention]

As mentioned above, in the conventional rotor, the arm and core are shrink-fitted and fitted with a press-fit cap, so as shown in Figure 4, high stress is generated at the fitting end, which reduces the mechanical strength of the core. In addition to this, there were problems such as it was difficult to accurately determine the maximum stress by calculation or the like.

This invention was made to solve the above-mentioned problems, and aims to provide a rotor that can reduce stress and calculate maximum stress with high accuracy.

[Means to solve the problem]

The rotor according to the present invention is provided with stress relaxation grooves such as round holes at the ends of the rotor core that fit with the arms.

[Effect]

In the stress relaxation groove according to the present invention, the maximum stress is reduced by making the structural shape continuous, and the maximum stress can be determined with high accuracy through calculation.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a sectional view of the rotor, and FIG. 2 is a stress distribution diagram of the fitting part iron core. In the figure, 5 is a stress relaxation groove provided on the inner periphery of the rotor core 3, and is installed at a position adjacent to the fitting portion with the arm 2.

Note that the same parts as in FIG. 3 are denoted by the same reference numerals, and explanations thereof will be omitted.

Next, the operation will be explained. By installing the stress relaxation grooves 5 in the rotor core 3 adjacent to the fitting portion, the structural shape becomes smoother. There will be no peak-like high stress in the area, resulting in a gentle stress distribution. In addition, in the conventional m-structure, the joint shape between the rotor core and the arm has sharp edges, making it difficult to analyze, but since the shape is smooth, the maximum stress can be determined with high accuracy through analysis such as the finite element method.

In the above embodiment, the stress relaxation grooves 5 of the rotor core are round grooves, but they may be square grooves.

〔Effect of the invention〕

As described above, according to the present invention, since stress relaxation grooves are provided at the mating end of the rotor core, the maximum stress generated in the mating part can be reduced, and the stress can be calculated with high precision. It has the effect of being able to

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a rotor according to an embodiment of the present invention, Fig. 2 is a stress distribution diagram of the fitting part iron core, Fig. 3 is a sectional view showing a conventional rotor, and Fig. 4 is a conventional It is a stress distribution diagram of the iron core of the fitting part of the structure. In the figure, 1 is a rotating shaft, 2 is an arm, 3 is a rotor core, 4 is a fitting portion between the arm and the core, and 5 is a stress M joint. (3) In addition, the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In a rotor including a rotating shaft, a plurality of arms attached radially around the rotating shaft, and a ring-shaped rotor core fitted to the outer periphery of the arm, the inner periphery of the rotor core is A rotor for a rotating electric machine, characterized in that a stress relaxation groove is arranged at a position adjacent to a fitting portion with the arm.