JP2900685B2 - Fixing device for stator press ring of short circuit generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator press ring fixing device applied to a short-circuit generator.

[0002]

2. Description of the Related Art FIG. 4 is a longitudinal sectional view of a stator of a conventional rotating electric machine. In FIG. 4, the stator core 3 is laminated and attached to the dovetail beam on the inner diameter side of the stator frame 2, and a pair of stator press rings 1 are applied to both ends of the stator core 3 and fastened with the fastening studs 5. . Conventionally, the stator press ring 1 is fixed only by a frictional force for fastening the stator press ring 1 to the stator core 3. The stator winding 4 is inserted and connected to a groove of the stator core 3. When a current flows through the stator winding 4, a circumferential electromagnetic force acts on an end of the stator winding.

[0003]

The short-circuit generator is mainly used for an AC circuit breaker test, and generates a large current in a short time. Therefore, a short-circuit generator is required to have a structure capable of sufficiently withstanding an abnormally large mechanical force caused by the large current. . Therefore, when an abnormally large electromagnetic force in the circumferential direction acts on the end of the stator winding, the short-circuit generator, like a conventional rotating electric machine, has a stator press ring 1 and a stator core 3 formed by tightening a tightening stud. The structure in which the stator press ring 1 is fixed only by the frictional force described above was insufficient.

It is an object of the present invention to provide a stator press ring fixing device in which a short-circuit generator stator press ring is completely fixed to a stator frame.

[0005]

A stator press ring fixing device for fixing a stator press ring of a short-circuit generator to a stator frame, wherein the stator press ring is attached to both ends in the axial direction of the stator frame and has radial recesses. A seat having a pair of stator press rings having a radial projection fitted into a recess of the seat, and a cotter for filling a circumferential gap between the projection and the recess. To achieve.

The seats of the stator frame are arranged at positions where the outer circumference of the stator frame is equally divided, and the projections of the stator press ring are fitted into the recesses of the respective seats. It is suitable for fixing the stator press ring.

Further, the seats of the stator frame are symmetrically arranged at four positions, that is, up and down and left and right of the stator frame, and the convex portions of the stator press ring are fitted into the concave portions of the respective seats. This is suitable for fixing the stator press ring.

[0008]

In the present invention, the protrusion of the stator press ring is fitted into the recess of the seat of the stator frame, and a cotter is buried in the circumferential gap between the protrusion and the recess to eliminate the gap. The stator press ring of the short-circuit generator can be completely fixed to the stator frame against the circumferential electromagnetic force acting on the stator winding end of the generator.

[0009]

1 is a longitudinal sectional view of a stator of a short-circuit generator having a stator press ring fixing device according to an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow II in FIG. 1, and FIG. II III-II
It is I sectional drawing. In FIG. 1, the same parts as those in FIG. 4 are denoted by the same reference numerals. In the figure, a stator core 3 is laminated and attached to a dovetail beam on the inner diameter side of a stator frame 2. At the positions at both ends in the axial direction of the stator frame 2 at which the outer periphery of the stator frame 2 is equally divided, seats having radial concave portions 6a are attached. A pair of stator press rings 1 are applied to both ends of the laminated stator core 3, and the protrusions 1 a of the stator press ring 1 are fitted into the recesses 6 a of the respective seats 6, and the stator core 3
With the fastening studs 5. Stator press ring 1
The cotter 7 is buried in a circumferential gap between the convex portion 1a of the seat 6 and the concave portion 6a of the seat 6.

In the example shown in FIG. 2, the seats 6 are arranged at four positions on the upper and lower sides and on the left and right sides of the stator frame 2 at positions where the outer periphery of the stator frame 2 is equally divided. 1a
Are fitted in the concave portions 6 of the respective seats 6. The seat 6 of the stator frame may be provided at a position where the outer circumference of the stator frame 2 is equally divided, and the number of seats may be two or three.
Since the stator press ring 1 is fixed to the stator frame 2 in this manner, the stator press ring 1 can be completely fixed so as not to move against a circumferential electromagnetic force acting on the stator winding end. .

[0011]

According to the present invention, the convex portion of the stator press ring is fitted into the concave portion of the seat attached to the stator frame, and the cotter is filled in the circumferential gap between the convex portion and the concave portion. Therefore, during the test using the short-circuit generator, the stator press ring does not move in response to the abnormally large electromagnetic force acting on the end of the stator winding, and the test can be performed safely.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a stator of a short-circuit generator showing an embodiment of the present invention.

FIG. 2 is a view in the direction of arrow II in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a longitudinal sectional view of a stator of a conventional rotating electric machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator press ring 1a Convex part 2 Stator frame 3 Stator core 4 Stator winding 5 Tightening stud 6 Seat 6a Recess 7 Cotter

Claims (3)

(57) [Claims] 1. A stator press ring fixing device for fixing a stator press ring of a short-circuit generator to a stator frame.
Attached to both ends of the stator frame in the axial direction, a seat having a radial concave portion, a pair of stator press rings having a radial convex portion fitted into the concave portion of the seat, the convex portion and the concave portion. And a cotter for filling a circumferential gap of the stator. 2. A fixing device for a stator press ring of a short-circuit generator according to claim 1, wherein a seat of the stator frame is disposed at a position for equally dividing an outer periphery of the stator frame. The fixing device of the stator press ring of the short-circuit generator, wherein the convex portion is fitted into the concave portion of each seat. 3. The stator press ring fixing device for a short-circuit generator according to claim 2, wherein the stator frame seats are symmetrically disposed at four positions on the upper, lower, left and right sides of the stator frame. The protrusions of (1) and (2) are fitted into the recesses of the respective seats, wherein the stator press ring of the short-circuit generator is fixed.