JPH09205744A - Stator core for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently radiate heat generated from a stator core by providing a plurality of slits on the outer periphery of the core along the peripheral direction by changing the positions of the slit in the laminated direction of the slits. SOLUTION: A plurality of slits 5 is provided on the outer periphery of a stator core 2 for electric rotary machine along the peripheral direction by changing the positions of the slits 5 in the laminated direction of the slits. The slits 5 are formed by laminating steel sheets 1b having an outer peripheral edge-side size (outside diameter ϕB) smaller than the outer peripheral edge-side size (outside diameter ϕA) of an ordinary steel sheet 1a upon another. The steel sheets 1a and 1b are coupled with each other by putting the coupling projections 4 of the steel sheets in the recessed sections of the adjacent steel sheets on the rear sides of the projections 4 by a progressive laminating method. When the slits 5 are provided on the outer periphery of the core 2 in such a way, the heat radiating area on the outer periphery of the stator core becomes larger and the heat generated from the core 2 can be radiated excellently.

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 rotating electric machine such as a generator.

[0002]

2. Description of the Related Art As a rotating electric machine such as a generator driven by a prime mover such as an internal combustion engine, there is one in which a stator is arranged on the outer circumference of a field rotor.

As shown in FIGS. 4 and 5, a stator of this type of rotating electric machine includes an annular stator core 2 made of a laminate of annular steel plates 1 having an outer diameter of φA, and the stator core 2. It is configured by an armature coil (not shown) wound around each salient pole 3 on the inner circumference.

The laminated body of the steel plates 1 constituting the stator core 2 is bound by the progressive lamination method. In the progressive stacking method, when the steel sheet 1 is punched out, a V-shaped binding protrusion 4 is formed in a part of the steel sheet 1 by punching, and the binding protrusion 4 is punched first. A series of steel plates 1 are sequentially bound by being pressed into a recess formed on the back side of the binding projection 4. In the annular stator core 2, a large number of bundling protrusions 4 are provided at a portion near the outer periphery of the stator core 2 at equal angular intervals.

[0005]

The rated output of a rotating electric machine is limited by the temperature limit of the insulator used in the rotating electric machine. The heat generation of the rotating electric machine is due to both iron loss caused by magnetic flux flowing through the stator core on the stator side and copper loss due to current flowing through the armature coil. When considering the increase in output with the same size, it is necessary to improve heat dissipation due to heat generation of iron loss and copper loss, but the conventional stator core 2 does not have a structure that improves heat dissipation.

An object of the present invention is to provide a stator core for a rotating electric machine which can satisfactorily dissipate heat.

Another object of the present invention is to provide a stator core for a rotary electric machine, which can easily form a structure capable of favorably radiating heat.

[0008]

DISCLOSURE OF THE INVENTION The present invention is to improve a stator core for a rotating electric machine, which is constructed by laminating steel sheets.

In the stator core for a rotary electric machine according to the present invention, a plurality of slits along the circumferential direction are provided on the outer periphery of the stator core at different positions in the stacking direction.

When a plurality of slits are provided on the outer circumference of the stator core along the circumferential direction as described above, the heat radiation area on the outer circumference of the stator core is increased, and the heat radiation from the stator core is favorably performed. it can.

In this case, it is preferable that the slit is formed such that the size of the outer peripheral edge side of the steel sheet is smaller than that of the adjacent steel sheet.

As described above, the size of the outer peripheral edge of the steel sheet is made smaller than that of the adjacent steel sheet to form the slit, so that the stator core which can radiate heat favorably can be easily formed.

Further, it is preferable that the steel sheets are bound by the progressive stacking method.

When the steel plates are bound by the progressive stacking method as described above, the steel plates can be bound easily and at low cost even with the stator core having slits on the outer circumference.

[0015]

1 to 3 (A) and (B) show an example of an embodiment of a stator core for a rotary electric machine according to the present invention.

In the stator core for a rotary electric machine of this example,
A plurality of slits 5 along the circumferential direction are provided on the outer circumference at different positions in the stacking direction. These slits 5 are shown in FIG.
As shown in (A) and (B), the outer peripheral edge side size (outer diameter φA) is larger than the outer peripheral edge side size (outer diameter φA) of the ordinary steel plate 1a.
It is formed by stacking steel plates 1b having a small B). The steel plates 1a and 1b are bound by fitting the binding protrusions 4 of the adjacent steel plates into the recesses on the back side of the binding protrusions 4 of a certain steel plate by the progressive stacking method.

When a plurality of slits 5 are provided on the outer circumference of the stator core 2 along the circumferential direction in this way, the heat radiation area on the outer circumference of the stator core 2 becomes large, and the heat radiation from the stator core 2 is good. Can be done.

In this case, if the slit 5 is formed such that the size of the outer peripheral edge side of the steel plate 1b is smaller than that of the adjacent steel plate 1a, the stator core 2 capable of excellent heat dissipation can be easily formed.

When the steel plates 1a and 1b are bound by the progressive stacking method, the stator core 2 having the slit 5 on the outer circumference can easily bind the steel plates 1a and 1b at low cost.

In the above example, the slits 5 are formed by changing the size of each steel plate one by one, but if the width of the slits 5 is to be widened, the number of stacked steel plates 1b having a small outer diameter size can be increased. Good. Further, by sequentially superposing the plurality of steel plates 1a and the plurality of steel plates 1b, the slit 5 can be provided at a desired position with a required width.

Further, in the above example, the outer shape of the steel plate 1b having a small outer diameter is a circle, but it does not necessarily have to be a circle having the same size.

The present invention can be applied not only to a generator but also to a stator core of a rotating electric machine such as an electric motor. Further, the shape of the stator core 2 can be applied not only to the annular core but also to a rectangular core or the like.

[0023]

In the stator core for a rotary electric machine according to the present invention, since a plurality of slits are provided on the outer periphery along the circumferential direction, the heat dissipation area on the outer periphery of the stator core becomes large, and the stator core It is possible to satisfactorily radiate heat from Therefore, the output can be increased with the same size. Further, by providing the slits on the outer circumference, it is possible to radiate heat without causing magnetic or electrical influences.

By forming the slits so that the size of the outer peripheral edge side of the steel sheet is smaller than that of the adjacent steel sheet, it is possible to easily form the stator core which can favorably radiate heat.

Further, by bundling the steel plates by the progressive stacking method, the bundling of the steel plates can be carried out easily and at low cost even in the stator core having slits on the outer circumference.

[Brief description of drawings]

FIG. 1 is a front view of an example of an embodiment of a stator core for a rotary electric machine according to the present invention.

FIG. 2 is a side view of the stator core for a rotary electric machine shown in FIG.

3 (A) and 3 (B) are front views of steel plates having different sizes that form the stator core for a rotary electric machine shown in FIG. 1.

FIG. 4 is a front view of a conventional stator core for a rotary electric machine.

5 is a side view of the stator core for a rotary electric machine shown in FIG. 4. FIG.

[Explanation of symbols]

 1, 1a, 1b Steel plate 2 Stator iron core 3 Salient pole 4 Bundling protrusion 5 Slit

Claims (3)

[Claims] 1. A stator core for a rotary electric machine, comprising laminated steel plates, wherein a plurality of slits along the circumferential direction are provided on the outer periphery of the stator core at different positions in the stacking direction. Stator core for rotating electrical machines characterized by. 2. The stator core for a rotary electric machine according to claim 1, wherein the slit is formed such that a size of an outer peripheral edge side of the steel plate is smaller than that of an adjacent steel plate. 3. The stator core for a rotary electric machine according to claim 1, wherein the steel plates are bound by a progressive stacking method.