JPH05161288A - Rotor of rotating machine - Google Patents

Abstract

PURPOSE:To provide a rotor of a rotating machine which has simplified and completed the laminating work within a short period to remarkably lower the cost thereof even though the lamination thickness of iron core is thick in a large size machine. CONSTITUTION:A cutout part 7 having a width larger than the thickness of the iron core 3 is provided in the adequate position in the axial direction of a dovetail projected in the external circumference of a spider arm 2 and a sector type iron core 3 is easily inserted into the cutout part 7 so that the projected dovetail may just easily be engaged with the recessed dovetail of the iron core 3. Therefore, the iron core may be easily laminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a rotary electric machine, and more particularly to a rotor suitable for large DC motors, induction motors and the like.

[0002]

2. Description of the Related Art In a conventional rotor, a projecting tab tail arranged on the outer circumference of a spider arm is engaged with a concave dovetail provided on the inner circumference of an iron core to stack thin plate-shaped fan-shaped iron cores. The rotor is formed such that the centrifugal force of the iron core during operation is held by the dovetail engaging portion.

Further, air ducts are arranged in the annular core at predetermined intervals in the axial direction, and cooling gas is circulated through the air duct to cool the rotor. This is for cooling the coil arranged on the outer peripheral portion of the annular core.

[0004]

This prior art does not take into consideration the iron core laminating work for a large-sized iron core having a laminating thickness of, for example, more than 3 m, and the laminating work takes a very long time. However, there is a problem that the cost becomes high.

That is, when stacking the fan-shaped divided iron cores, it is necessary to insert the iron cores from the ends of the projecting dovetails and stack them at a predetermined position. When the stacking thickness is 3 m,
At the beginning, it was necessary to move by 3 m and stack, and the number of stacking steps was extremely large.

It is an object of the present invention to provide a rotor for a rotating electric machine, which facilitates the stacking work and completes it in a short period of time even when the core thickness is large in a large machine and the cost is greatly reduced. is there.

[0007]

In order to achieve the above object, the present invention provides a notch having a width larger than the thickness of the iron core at an appropriate axial position of a dovetail projecting on the outer circumference of a spider arm. The fan-shaped iron core is easily inserted from the cut portion so that the protruding dovetail arranged on the outer circumference of the spider arm and the concave dovetail arranged on the iron core can be engaged very easily, and the iron core is laminated. Is made easy.

[0008]

The notch is arranged only in the air duct portion in the axial direction and is not provided in the iron core portion, and the iron core is completely engaged with the spider arm by the dovetail over the entire axial length. The centrifugal force of the iron core inside is completely retained by the dovetail of the spider, so that the iron core is not scattered by the centrifugal force.

[0009]

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

FIG. 1 is a vertical cross-sectional view showing a main part of a rotor of the present invention. A rotor 11 has a rotating shaft 1, a spider arm 2 radially provided on the rotating shaft 1, and a spider arm. 2, an annular iron core 3 formed by stacking fan-shaped divided pieces on the outer periphery of the coil 2, and a coil 4 arranged on the outer periphery of the iron core 3.
It is composed by.

An air duct 5 is arranged in the iron core 3 at a predetermined interval in the axial direction, and a cooling gas is circulated through the air duct 5 to cool the rotor. Further, a notch 7 for facilitating the stacking work of the iron cores 3 is arranged in a part of the air ducts 5 arranged in the axial direction.

As shown in FIG. 6, the notch 7 is composed of a notch 7a and a notch 7b on the side surface of the dovetail 6b. When the iron core 3 and the air duct 5 are laminated, the notch 7a is formed as shown in FIGS. Insert the dovetail 6a shown into the notch 7. This insertion situation will be described with reference to FIG.

Next, the width T2 of the notch 7 is made larger than the thickness T1 of the air duct contact plate 5a shown in FIG. 4, smaller than the height T3 of the duct piece 5b, and larger than the thickness of the iron core 3. ing.

Therefore, the iron core 3 and the air duct 5
Can be easily inserted from the notch 7, and the iron core 3 and the air duct abutting plate 5a are completely engaged with the dovetails 6a and 6b over the entire axial length, so that the centrifugal force of the iron core 3 and the air duct 5 can be prevented. It can be held by the projecting dovetail 6b provided on the core 2, and the iron core 3 and the air duct 5 do not scatter.

8 and 9 show another embodiment of the present invention, in which an annular rotor rim 9 is arranged on the inner peripheral portion of the iron core 3, and a dovetail key 8 is provided between the iron core 3 and the rim 9. Although inserted, the short-shaped key 10 is engaged with the inner periphery of the rim 9 and connected to the spider arm 2, but notches 7a and 7b shown in FIG. 6 are formed at appropriate positions in the axial direction of the dovetail key 8. Of course, the same effect as in FIG. 1 can be obtained.

FIG. 10 shows another embodiment of the present invention, in which the dovetail key 8 is inserted between the spider arm 2 and the iron core 3, and the notch shown in FIG. 6 at an appropriate axial position of the dovetail key 8. Of course, 7a and 7b are provided, and the same effect as that of FIG. 1 is obtained.

It is needless to say that a plurality of the notches 7 provided in the protruding dovetail 6b may be provided in the axial direction according to the laminated thickness L of the iron core 3 shown in FIG. Of course, it is provided at the place where the air duct 5 is located.

[0018]

According to the present invention, the notch 7 having a width larger than the thickness of the iron core 3 and the air duct contact plate 5a is formed at an appropriate axial position of the projecting dovetail 6b engaging with the inner peripheral portion of the iron core 3. Since it is provided, the iron core 3 and the air duct 5
Can be easily inserted from the notch 7, and the work of stacking the iron core 3 becomes extremely easy. That is, for example, when the laminated thickness of the iron core is 3 m, conventionally, it was necessary to insert the iron core 3 from the end portion of the protruding dovetail 6b and move it by 3 m to laminate, but in the present invention, the notch 7 is formed in the axial direction. When it is provided in two places, the iron core 3 may be inserted through the notch 7 and moved by 1 m for lamination, and the lamination work becomes extremely easy.

Further, since the width T2 of the cut 7 is smaller than the height T of the duct piece 5b, the iron core 3 and the dovetail groove 6a of the air duct contact plate 5a are completely engaged with the dovetail 6b, and the iron core 3 and the air duct. A centrifugal force of 5 can be retained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a rotor of a rotary electric machine that is an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a front view of the air duct portion of FIG.

4 is a vertical cross-sectional view taken along the line IV-IV of FIG.

FIG. 5 is an enlarged perspective view of FIG. 3.

FIG. 6 is an enlarged perspective view showing a spider arm portion of FIG. 2.

FIG. 7 is an explanatory diagram for inserting the iron core and the air duct into the dovetail.

FIG. 8 is a vertical sectional view of another embodiment of the present invention.

9 is a lateral cross-sectional view taken along the line IX-IX in FIG.

FIG. 10 is a longitudinal sectional view showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotation axis, 2 ... Spider arm, 3 ... Iron core, 4 ... Coil, 5 ... Air duct, 5a ... Contact plate, 5b ... Duct piece, 6a ... Dovetail, 6b ... Protruding dovetail, 7 ...
Notch, 8 ... Dovetail key, 9 ... Rotor rim, 10 ...
Key, 11 ... Main part of the rotor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Nakata 3-1-1 1-1 Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi factory

Claims (4)

[Claims] 1. A rotating shaft, a spider arm mounted on the rotating shaft, and a protruding dovetail circumferentially arranged on the outer circumference of the spider arm or a rotor rim arranged on the outer circumference of the spider arm. A ring-shaped iron core engaged with the dovetail and attached, and an air duct arranged along the axial direction of the iron core,
A rotor of a rotating electric machine, wherein a cut is provided in an axial direction of the dovetail, and a width of the cut is made larger than thicknesses of the iron core and the air duct contact plate. 2. The cut width T of the dovetail is smaller than the height of the air duct piece.
The rotor of the rotating electric machine described. 3. The dovetail is separated from other parts, and the dovetail is also provided on the inner peripheral side to engage with the spider arm or the rotor rim. Rotating electric machine rotor. 4. The rotor of a rotary electric machine according to claim 1, wherein the dovetail is provided on an outer circumference of the rotor rim arranged on an outer circumference of the spider arm.