JPH114554A - Rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the outer diameter of a stator core without reducing cooling performance and to miniaturize a rotating machine, by forming a ventilation hole at a cooling fin and allowing cooling air to flow outside the cooling fin and in the ventilation hole. SOLUTION: In a rotating machine 25, cooling air flows through a space 14 between a frame 13 and a stator core 11 in an axial direction outside a cooling fin 15, and at the same time flows in an axial direction also in a ventilation hole 23 being provided at the cooling fin 15. More specifically, by providing a ventilation hole 23 at the cooling fin 25, a cooling area at the part of the cooling fin 15 increases and the cooling efficiency of the stator core 11 increases. As a result, even if the stator core 11 is miniaturized to reduce the size of the rotating machine 25, a required cooling area can be secured. Also, even if the height of the cooling fin 15 is lowered, a cooling effect that is at least equivalent to a conventional one can be obtained. Therefore, by reducing the outer diameter of the stator core 11 and miniaturizing the stator core 11, the rotating machine 25 can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine, and is useful when applied to a rotating electric machine having cooling fins on the outer periphery of a stator core.

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view showing a function of a stator core in a rotating electric machine, FIG. 5 is a cross-sectional view showing a main part structure of a stator core in a conventional rotating electric machine, and FIG. It is a cross-sectional view which shows the principal part structure of another stator core.

As shown in FIG. 4, a stator core (laminated core formed by laminating electromagnetic steel sheets) 1 provided in a rotating electric machine 1
Consists of a coil groove 5 provided with a yoke part 2, tooth parts (teeth part) 3, and a stator coil 4, but as shown by an arrow in FIG. It is important to secure a magnetic path having a constant cross-sectional area so that the magnetic path can be formed.

On the other hand, the magnetic path and the stator coil 4 generate iron loss and copper loss and generate heat, so that cooling is required. Conventionally, as shown in FIG. 5, cooling fins (folds) 7 are formed on an outer peripheral portion of the stator core 1 to increase a heat radiation area, and a space between a frame (not shown) and the stator core 1 is formed. Is configured to be efficiently cooled by the cooling air flowing in the axial direction. Alternatively, as shown in FIG. 6, a cooling air hole 8 is provided in the yoke portion 2 of the stator core 1, and cooling air is allowed to flow in the cooling air hole 8 in the axial direction for cooling. .

[0005]

However, when the cooling fins 7 are provided on the outer peripheral portion of the stator core 1, the cooling fins 7 do not serve as a magnetic path at all (the part B in FIG. The height H of the cooling fins 7 is desired to be as small as possible because an extra core material (magnetic steel sheet) is required.

When the stator core 1 is made smaller in order to reduce the size of the rotating electric machine, the outer peripheral area of the stator core 1, that is, the heat radiation area becomes smaller in proportion to the outer diameter of the stator core 1, so that cooling is performed. It becomes increasingly difficult.

Also, when the cooling air holes 8 are provided in the yoke portion 2 of the stator core 1, the magnetic path is narrowed by the integral of the cross section of the cooling air holes 8, so that the outer shape of the stator core 1 is reduced. Must be bigger.

Accordingly, in view of the above prior art, the present invention has cooling fins on the outer periphery of the stator core, and further reduces the outer diameter of the stator core without deteriorating the cooling performance, thereby reducing the overall size. An object of the present invention is to provide a rotating electric machine that can perform the above.

[0009]

According to the present invention, there is provided a rotating electric machine having a stator core having cooling fins on its outer periphery, wherein the cooling fins are provided with cooling ventilation holes, The cooling wind is configured to flow outside the cooling fins and inside the cooling ventilation holes.

Therefore, according to the rotating electric machine of the present invention, the cooling air flows outside the cooling fins, and also flows into the cooling ventilation holes provided in the cooling fins. That is, by providing the cooling ventilation holes in the cooling fins, the heat radiation area in the cooling fins is increased as compared with the case where the cooling fins are simply provided as in the related art.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1A is a cross-sectional view of a rotary electric machine according to an embodiment of the present invention, in which a lower half is omitted, and FIG. 1B is a sectional view taken along line AA of FIG. Longitudinal section, FIG. 2 is FIG. 1
It is a B section enlarged view of (a).

As shown in FIG. 1, a stator 10 is provided inside a frame 13, and a rotor 17 is provided inside the stator 10. Both sides in the axial direction of the shaft 9, which is the rotation axis of the rotor 17, are rotatably supported by bearings 20 and 21. A blade 8 is fixed to the shaft 9, and the blade 8 rotates together with the shaft 9 so that cooling air flows into the frame 13.

The stator 10 includes a stator core (laminated core formed by laminating electromagnetic steel sheets) 11 and a stator coil 16. The stator core 11 is supported by an iron core receiver 12 provided on the inner peripheral surface of the frame 13, and the stator coil 11 is provided in a coil groove 22 on the inner peripheral portion of the stator core 11.

Cooling fins (folds) 15 are formed on the outer periphery of the stator core 11, and cooling fins 15 are formed with cooling ventilation holes 23, as shown in FIG. The cooling vent hole 23 has a circular cross section formed at the base end portion of the cooling fin 15 and has a large diameter and a cooling vent hole 23a having a large diameter. The cooling vent 23b has a small diameter.

The shape and number of the cooling vents 23 are not limited to those shown in FIG. 2, but may be set appropriately according to the height and width of the cooling fins 15. For example, as shown in FIG. 3, the cooling ventilation hole 23 may be a single cooling ventilation hole having a substantially triangular cross section.

Therefore, according to the rotating electric machine 25 having the above-described structure, the cooling air passes through the space 14 between the frame 13 and the stator core 11 as shown by the arrow in FIG. 15 flows in the axial direction, and also flows in the cooling ventilation holes 23 provided in the cooling fins 15 in the axial direction.
That is, by providing the cooling air vents 23 in the cooling fins 25, the heat radiation area at the cooling fins 15 is increased and the cooling efficiency of the stator core 11 is increased as compared with the conventional case where cooling fins are simply provided. Can be Therefore, even if the stator core 11 is reduced in size to reduce the size of the rotating electric machine 25, a required heat radiation area can be secured.

The height of the cooling fins 15 (H in FIG. 5)
), A cooling effect equal to or higher than that of the related art can be obtained. Therefore, by reducing the outer diameter of the stator core 11 and downsizing the stator core 11, the rotating electric machine 25 can be downsized. Can be planned.

In order to form the cooling ventilation holes 23 in the cooling fins 15, the cooling ventilation holes 23 are added to the cooling fins 15 formed by stamping out the electromagnetic steel sheet constituting the stator core 11 by pressing. Just need. Therefore, the stator core 1
1 does not increase the cost.

[0020]

As described above in detail with the embodiments of the present invention, according to the rotating electric machine of the present invention, the cooling air flows outside the cooling fins 15 and the cooling ventilation provided on the cooling fins. It also flows into the hole. That is, by providing the cooling ventilation holes in the cooling fins, the heat radiation area in the cooling fin portion is increased and the cooling efficiency of the stator core is increased as compared with the case where the cooling fins are simply provided as in the related art.
For this reason, even if the stator core is downsized in order to downsize the rotating electric machine, a required heat dissipation area can be secured.

Further, even if the height of the cooling fins is reduced, a cooling effect equal to or higher than that of the conventional one can be obtained. Therefore, by reducing the outer diameter of the stator core and miniaturizing the stator core,
The size of the rotating electric machine can be reduced.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a rotary electric machine according to an embodiment of the present invention, in which a lower half is omitted, and FIG.
FIG. 2 is a vertical cross-sectional view taken along line A.

FIG. 2 is an enlarged view of a portion B in FIG.

FIG. 3 is a cross-sectional view showing an example of another cooling ventilation hole formed in a cooling fin.

FIG. 4 is an explanatory diagram showing a function of a stator core in the rotating electric machine.

FIG. 5 is a cross-sectional view showing a main structure of a stator core in a conventional rotating electric machine.

FIG. 6 is a cross-sectional view showing a main structure of another stator core in a conventional rotating electric machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stator 11 Stator iron core 15 Cooling fin 23 Cooling ventilation hole 25 Rotating electric machine

Claims (1)

[Claims] 1. A rotating electric machine having a stator core having cooling fins on an outer periphery thereof, wherein said cooling fins are provided with cooling ventilation holes, and cooling air flows between said cooling fins and said cooling ventilation holes. A rotating electric machine characterized by being configured to flow.