JPH0614482A - Stator iron core of rotary electrical equipment - Google Patents

Abstract

PURPOSE:To construct a stator iron core of a valve water turbine generator in such a structure that a laminated iron core may be mounted within a stator frame easily and a space between the stator frame and the stator iron core may be formed with accuracy. CONSTITUTION:Projections 3 are formed in an outer part of a sector-shaped thin iron plate 1 which constitutes a stator iron core. The height of the projections 3 would comply with a space delta between a stator frame 2 and a stator iron core. Adjacently to the projections 3, a recess 4 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core of a rotary electric machine such as a valve turbine generator.

[0002]

2. Description of the Related Art FIG. 5 is a perspective view of a stator core of a valve turbine generator, and includes a plurality of sector-shaped thin iron plates 1 (7 in the figure).
To form an annular plate shape, and a plurality of these are stacked in the axial direction to be laminated. FIG. 6 is an enlarged front view of a portion viewed from an arrow P in a state where the stator core of FIG. 5 is inserted into the stator frame. In the figure, 2A indicated by a mesh is a dovetail key,
The stator frame 2 is fixed to the inner diameter of the stator frame 2 with screws at equal intervals in the axial direction. Two dovetail portions 1A that can be fitted into the dovetail keys 2A are provided on the outer peripheral side of the sector-shaped thin iron plate 1, and a groove 1 for accommodating the stator winding is provided on the inner peripheral side.
A plurality of Bs are provided. The stator core requires a certain gap δ between itself and the inner wall of the stator frame 2 to allow thermal expansion during operation. In this way, the stator core and the stator frame 2
When the stator iron core is loaded on the inner diameter portion of the stator frame 2 while maintaining a constant gap δ between the sector iron thin plate 1 and
Dovetail part 1A of the dovetail key 2A of the stator frame 1
Then, the sector-shaped thin iron plate 1 is pulled inward and positioned so that a gap δ is formed between the inner periphery of the stator frame 2 and the outer periphery of the sector-shaped thin iron plate 1. Next, this sector-shaped thin iron plate 1
Insert the sector-shaped thin iron plate next to, and similarly position it by pulling it inward. Such an operation is repeated a plurality of times (7 times in the figure) to form an annular plate shape, and the stator cores laminated in the stator frame 2 are fixed by stacking the annular plate shape.

[0003]

Since the conventional iron core stacking work is performed by pulling the sector-shaped thin iron plates inward with reference to the taper portion of the dovetail key 2A of the stator core, the sector-shaped thin iron plates on both sides of the sector are drawn. In addition, it is extremely difficult to form the gap δ and the workability is poor, and the working time for ensuring the accuracy of the gap δ is long.

The object of the present invention is to solve the above-mentioned problems.
An object of the present invention is to provide a structure of a stator iron core of a rotating electric machine, which has good workability of iron core stacking and ensures a clearance δ with high accuracy.

[0005]

According to the present invention, a plurality of sector-shaped thin iron plates having a dovetail portion on which the dovetail key can be fitted are provided on the dovetail key axially provided on the inner diameter portion of the stator frame. A stator core of a rotary electric machine in which a plurality of sheets are sequentially fitted into each other to form an annular shape, and a plurality of these layers are stacked in layers in the axial direction and a constant gap is provided between the inner diameter portion of the stator frame and the outer circumference of the stator core. In the above, a protrusion having low rigidity is provided on the outer peripheral side of the sector-shaped thin iron plate of the stator core. The height of this protrusion is a size commensurate with the gap formed between the inner diameter of the stator frame and the outer periphery of the stator core, and the protrusion is provided adjacent to the protrusion provided on the outer periphery of the sector thin iron core. Set up. The protrusions are provided at the left and right end positions on the outer peripheral side of the sector-shaped thin iron plate.

[0006]

[Function] By using the projection and the taper of the dovetail key as a guide and accommodating and stacking the sector-shaped thin iron plates inside the stator frame, the gap δ between the inner periphery of the stator frame and the outer periphery of the stator core can be accurately and Stacking workability is also good, and stator cores can be stacked.

[0007]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG.
Is a detailed view of a portion viewed from the arrow Q in FIG. 1, and the same reference numerals as those in FIG. 4 are the same parts. This embodiment is different from the conventional example in that the projection 3 is provided on the outer peripheral side of the sectoral thin iron plate 1. That is, the height dimension of the protrusion 3 is selected to be equal to the gap δ between the inner diameter of the stator frame 2 and the outer diameter of the stator core, and its rigidity is selected to be small. Further, it is preferable that the protrusions 3 are provided at both ends of the outer periphery of the sectoral thin iron plate 1. This is because the projection 3 serves as a guide for the inner circumference of the stator frame 2. As shown in FIG. 2, a ridge portion 4 is provided adjacent to the protrusion 3. This is to enter when the projection 3 is crushed by thermal expansion, and at that time, the crushed projection 3 is prevented from protruding from the outer periphery of the sectoral thin iron plate 1. To fit the iron core into the inner circumference of the stator frame 2, the dovetail portion 1A of the sector-shaped thin iron plate 1 is fitted into the dovetail key 2A of the stator frame 2 to form the sector-shaped thin iron plate 1.
The projections 3 and the dovetail portion 1A at both ends of the guide serve as a guide, and the gap δ between the stator frame 2 and the sector thin iron plate 1 and the gap δ between the tip of the dovetail key 2A and the bottom of the dovetail portion 1A.
Is secured. The sector-shaped thin iron plate 1 is sequentially fitted into the dovetail key 2A at its dovetail portion 1A to form an annular thin iron plate, and a plurality of the thin iron plates are stacked and laminated in the stator frame 2. When the generator operates, the stator core thermally expands due to the heat generated and expands to the outer peripheral side. At this time, the projections 3 of the sector-shaped thin iron plate 1 are crushed and sneak into the pocket portion 4, as shown in FIGS. 3 and 4. It will be in a state.

[0008]

According to the present invention, by providing the projections on the outer peripheral side of the sector-shaped thin iron plate 1, a gap is secured between the thin iron plate 1 and the stator core formed by stacking the thin iron plates on the inner diameter of the stator frame, and the workability of stacking the iron core is improved. Improved. The thermal expansion of the stator core caused by the heat generated during the operation of the generator can be dealt with by the crushing of the protrusions and the elimination of the gap.

[Brief description of drawings]

FIG. 1 is a front view of an essential part of an embodiment of the present invention.

FIG. 2 is a detailed view of a portion viewed from an arrow Q in FIG.

FIG. 3 is a front view of an essential part of the state where the stator core is thermally expanded in FIG. 1 and the protrusions are crushed by the thermal expansion.

FIG. 4 is a detailed view of an R arrow portion in FIG.

FIG. 5 is a perspective view of a stator core of a valve turbine generator.

FIG. 6 is a detailed view of a portion viewed from an arrow in FIG.

[Explanation of symbols]

 1 Sector-shaped thin iron plate 1A Dovetail part 2 Stator frame 2A Dovetail key 3 Protrusion 4 Groove part δ Gap

Claims (4)

[Claims] 1. A plurality of sector-shaped thin iron plates having a dovetail portion on which the dovetail key can be fitted, are sequentially fitted to a dovetail key axially provided on an inner diameter portion of a stator frame to form an annular shape. , A sector core of a stator core of a rotating electric machine in which a plurality of these are stacked in the axial direction and a constant gap is provided between the inner diameter portion of the stator frame and the outer circumference of the stator core. A stator core of a rotary electric machine, characterized in that a protrusion having low rigidity is provided on the outer peripheral side of a thin iron plate. 2. The rotating electric machine according to claim 1, wherein the height of the protrusion is a size commensurate with a gap formed between the inner diameter portion of the stator frame and the outer circumference of the stator core. Stator core. 3. A stator core for a rotating electric machine according to claim 1, wherein a sector is provided adjacent to a protrusion provided on the outer peripheral side of the sector-shaped thin iron core. 4. The stator core of a rotating electric machine according to claim 1, wherein the projections are provided at left and right end positions on the outer peripheral side of the sectoral thin iron plate.