JPH0433531A - Rotary electric machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rotating electric machine in which a stator core having a notch and an arcuate portion is fitted into a machine frame.

(Prior Art) A conventional example (first conventional example) of an open rotating electric machine is shown in FIGS. 10 and 11. That is, a stator core 2 having a notch 2a and an arcuate part 2b on the outer periphery is fitted into a cylindrical stator frame 1 that forms part of a machine frame, and bearing brackets are attached to both ends of this stator frame. 3.3 is attached with bolts 4 and nuts 5. The rotor 6 has a rotating shaft 7 connected to a rotor core 8.
The rotary shaft 7 is rotatably supported by the bearing bracket 3.3 via bearings 9, 9. A cooling fan 10 is attached to the end of the rotor core 8, and windbreak plates 11 corresponding to the fan are attached to both ends of the stator frame 1. Due to the blowing action of these fans 10, outside air is drawn into the stator frame 1 through the intake port 12 of the bearing bracket 3, and the stator core 2
After being cooled, it is discharged from an exhaust port 13.

In addition, the conventional example (second conventional example) of a sealed rotating electrical machine is
This is shown in FIGS. 2 and 13. That is, like the first conventional example, the stator frame 1. Stator core 2, bearing bracket 3. Bolt 4. Nut 51 Rotor 62 Rotator 72 Rotor core 8. The stator frame 1 and the bearing bracket 3 have an exhaust port 13 and an intake port 1.
2 is not formed. One end of the rotating shaft 7 projects outward from the bearing bracket 3, and a cooling fan 14 is attached to the projecting end. A plurality of cooling fins 15 attached to the cooling fins 15 are used for cooling.

(Problem to be solved by the invention) In the first and second conventional examples described above, the stator core 2
Although the circular arc portion 2b and the inner surface of the stator frame 1 are in close contact with each other and the heat transfer coefficient is high, a space is formed between the notch portion 2a and the inner surface of the stator frame 1, which reduces heat transfer. rate is low. Therefore, when the rotating electric machine is operated and the temperature of the stator core 2 increases, most of the heat of the stator core 2 is transmitted to the stator frame 1 through the arc portion 2b and dissipated. Therefore, there is a problem that the temperature of the portion of the stator frame 1 corresponding to the arcuate portion 2b becomes higher than the temperature of the portion corresponding to the notch portion 2a.

The present invention has been made in view of the above circumstances, and its purpose is to increase the heat dissipation area of the portion of the machine frame corresponding to the circular arc portion of the stator core, thereby quickly dissipating the heat generated in the stator core. To provide a rotating electric machine which can uniformize the temperature rise of each part of the machine frame and reduce the temperature rise of the whole machine by dissipating the heat.

[Structure of the Invention (Means for Solving the Problems) The rotating electric machine according to claim 1 has a stator core consisting of a circular arc portion and a cutout portion fitted into the machine frame, and a cooling fan provided therein. The present invention is characterized in that a plurality of cooling fins are provided only in a portion of the outer peripheral portion of the machine frame that corresponds to the circular arc portion of the stator core.

A rotating electric machine according to a second aspect of the present invention includes a stator core having a circular arc portion and a cutout portion fitted into a machine frame having a large number of cooling fins on the outer periphery, and a cooling fan externally blowing air to the cooling fins. In the sealed type, the cooling fins in the portion corresponding to the circular arc portion of the stator core are set larger in height than the cooling fins in the portion corresponding to the cutout portion of the stator core. Has characteristics.

A rotating electric machine according to a third aspect of the present invention is one in which a stator core consisting of a circular arc portion and a cutout portion is fitted into a machine frame, and a cooling fan is provided inside the machine frame, wherein the stator core is disposed in an outer peripheral portion of the machine frame. The cooling fins are characterized in that a plurality of cooling fins are provided only in portions corresponding to the arcuate portions of the cooling fins, and each cooling fin is set such that the height dimension of the central portion is maximum.

(Function) According to the rotating electric machine described in Claims, a plurality of cooling fins are provided only in a portion of the outer circumferential portion of the machine frame that corresponds to the circular arc portion of the stator core. The heat dissipation area of the portion corresponding to the arc portion of the stator core can be increased.

According to the rotating electric machine according to claim 2, in the closed type, among the many cooling fins on the outer peripheral part of the machine frame, the cooling fins in the part corresponding to the circular arc part of the stator core are replaced with the cooling fins in the part corresponding to the notch part. Since the height dimension is made larger than that of the cooling fins, it is possible to increase the heat dissipation area of the portion corresponding to the circular arc portion of the stator core in the outer peripheral portion of the machine frame.

According to the rotating electric machine according to claim 3, the cooling fins are provided only in the portion corresponding to the circular arc portion of the stator core on the outer periphery of the machine frame, and each cooling fin has a maximum height at the center portion. Therefore, it is possible to increase the heat dissipation area of the portion corresponding to the circular arc portion of the stator core in the outer peripheral portion of the machine frame.

(Example) Hereinafter, a first example in which the present invention is applied to an open rotating electrical machine will be described with reference to FIGS. 1 to 4.

First, in FIGS. 1 and 2, 20 is a machine frame, which has bearing brackets 22 at both ends of a cylindrical stator frame 21.
．． 22 is fixed by a stud 23 and a nut 24. A stator 25 is fitted inside the stator frame 21. The stator 25 is composed of a stator core 26 and a coil 27 wound around the stator core 26. The stator core 26 is made of a band-shaped electromagnetic steel plate 26 as shown in FIG.
The punched plates 26b punched from the blanks 26b are stacked as shown in FIG. are formed, and the four arcuate portions 26d are in close contact with the inside of the stator frame 21. 28. Windproof plates 28 are sandwiched between both ends of the stator frame 21 and the bearing brackets 25, 25, and correspond to both ends of the coil 27. 29
is a rotor, which is constructed by press-fitting a rotating shaft 31 into a rotor core 30, and the rotating shaft 30 is attached to a bearing bracket 25.
．． 25 via bearings 32, 32 so as to be rotatable. A cooling fan 33 is integrally cast with the end ring 30a at the end of the rotor core 30, and faces the inner end of the windshield plate 28. Reference numeral 34 indicates an intake port formed on the side surface of the bearing bracket 25, and reference numeral 35 indicates an exhaust port formed at both ends of the stator frame 21. 36a to 3
6e is a plurality of cooling fins, which are connected to the stator frame 21.
It is provided only at a portion of the outer peripheral portion of the stator core 26 corresponding to the arc portion 26d of the stator core 26. The height dimensions of these cooling fins 36a to 36e are such that the height dimension Ha of the cooling fins 36a, 36a at both ends in the circumferential direction is the minimum,
The height increases as it approaches the center, and the height He of the central cooling fin 36e becomes maximum. Furthermore, each of the cooling fins 36a to 36e has a small end portion in the axial direction and a large center portion.

Next, the operation of the first embodiment will be explained.

When the coil 27 of the stator 25 is energized, the temperature of the coil 27 and the stator core 26 rises, and this heat is transferred to the arc portion 26d.
It is transmitted to the stator frame 21 through the cooling fins 36a to 36e and radiated from the cooling fins 36a to 36e.

On the other hand, when the rotor 28 rotates, the cooling fan 33 rotates, and the air blowing action of the cooling fan 33 cools the side surface of the stator core 26 and the end of the coil 27 with the outside air taken in from the intake port 34, and then It is discharged from 35.

The first embodiment described above has the following effects.

□ Immediately, the arc portion 26d of the stator core 26 of the stator frame 21
A plurality of cooling fins 36a to 36e are provided at locations corresponding to
As a result, the heat dissipation area of the outer circumferential portion of the stator core 2 corresponding to the arcuate portion 26d to which heat is easily transferred can be increased.

Therefore, the heat of the stator core 26 transmitted to the stator frame 21 through the arc portion 26d is quickly dissipated into the air from the plurality of cooling fins 36a to 36e, and unlike the first conventional example, The rise in temperature of the child frame 21 and the stator core 26 can be reduced, and the temperature of each part can be made uniform. In particular, in the central part of the stator core 26 in the stacking direction, the temperature rise is large because the cooling effect of the cooling fan 33 does not reach the central part, but in the above embodiment, each of the cooling fins 36a to 36e
Since the height of the central cooling fin 36e is maximized, it is possible to more effectively reduce the temperature rise and equalize the temperature of each part.

5 and 6 show a second embodiment in which the present invention is applied to a sealed rotating electric machine, and the same parts as in the first embodiment shown in FIGS. 1 to 4 are designated by the same reference numerals. The different parts will be explained below. However, the stator frame 21 and the bearing bracket 22 are not provided with the exhaust port 35 and the intake port 34, and the stator frame 21 is not provided with the windbreak plate 28.

37 is a cooling fan, which is attached to the end of the rotating shaft 31 that protrudes to the left from the bearing bracket 22. Reference numeral 38 denotes a cover attached to the bearing bracket 22 so as to cover the side surface thereof and the cooling fan 37. A suction port 39 is formed at one end surface, and a cover 38 is installed between the other end and the outer circumference of the bearing bracket 25. A discharge port 40 is formed. A plurality of cooling fins 41a to 41e are attached to a portion of the outer circumference of the stator frame 21 that corresponds to the arcuate portion 26d. 42 is a plurality of cooling fins,
These are attached to a portion of the outer peripheral portion of the stator frame 21 that corresponds to the flat portion 26c. In this case, the height dimensions of the cooling fins 41a to 41e are such that the height dimension Ha of the cooling fins 41a at both ends in the circumferential direction is the minimum, and the height dimension Ha of the cooling fins 41a at both ends in the circumferential direction is the minimum height dimension.
The cooling fins 41e at the center of the stator core 26 in the stacking direction become larger as they get closer to the center in the stacking direction of the stator core 26.
The height dimension He of is the maximum. Furthermore, each cooling fin 41
In a to 41e, the height Hf of the introduction part on the cover 38 side is smaller than the height Ha to He of the other parts, and the height of the cooling fin 42 is equal to Hf. .

Next, the operation of the second embodiment will be explained.

When the coil 27 of the stator 25 is energized and the rotor 28 rotates, the temperature of the coil 27 and the stator core 26 increases,
This heat is transmitted to the stator frame 21 and the cooling fins 41a to 41e and 42 through the arc portion 26d. on the other hand,
When the cooling fan 37 is rotated, the outside air sucked in from the suction port 39 is discharged from the discharge port 40 due to the blowing action of the cooling fan 37, cooling the cooling fins 41a to 41e and 42, and dissipating the heat of the stator core 26 into the air. is dissipated into.

The second embodiment described above has the following effects.

That is, the cooling fins 41a to 41- in the stator frame 21 at the portions corresponding to the arcuate portions 26d of the stator core 26
The height of the stator core 2 is set larger than the height of the cooling fin 42 at the portion corresponding to the flat portion 26c to increase the heat dissipation area at the portion corresponding to the arcuate portion 26d.
6 can be quickly dissipated, and unlike the second conventional example, the temperature rise of the stator frame 21 and stator core 26 can be reduced, and the temperature of each part can be made uniform.

7 and 8 show a third embodiment in which the present invention is applied to a sealed rotating electric machine, and the same parts as in the second embodiment shown in FIGS. 5 and 6 are designated by the same reference numerals. The explanation will be omitted and only the different parts will be explained.

43a to 43e are a plurality of cooling fins, and these are attached only to a portion of the outer circumferential portion of the stator frame 21 that corresponds to the circular arc portion 26d. Cooling fins 43a to 43e
The height dimensions of the introduction part on the cover 38 side and the introduction part on the opposite side are equal to Hf, and in the remaining parts, the height becomes larger as it approaches the center in the stacking direction of the stator core 26, and the height of the center part increases. The dimensions Hg to Hk are maximum.

In addition, the above height dimensions Hg to Hk are Hk > He >
Hj>Hd>Hi>Hc>Hh>Hb>Hg>Ha>H
It is set like f.

This third embodiment also provides the same effects as the second embodiment.

FIG. 9 shows a fourth embodiment in which the present invention is applied to an open type rotating electric machine, and the difference from the first embodiment is that the stator frame 2
A plurality of cooling fins 44a to 4 are provided in the axial direction at a portion of the outer peripheral portion of the stator core 26 corresponding to the circular arc portion 26d of the stator core 26.
4h, and the height of the cooling fins 44a to 44h is set such that the height of the cooling fins 44a at both ends in the axial direction is the minimum, and increases as the height approaches the center of the stator Vζ core 26 in the stacking direction. The height of the central cooling fin 44h is set to be the maximum.

This embodiment also provides the same effects as the first embodiment.

[Effects of the Invention] Since the present invention has been described above, it has the following effects.

In the rotating electric machine described in [Claim], a plurality of cooling fins are provided only in a portion of the outer periphery of the machine frame that corresponds to the circular arc portion of the stator core. It can increase the heat dissipation effect, quickly dissipate the heat generated in the stator core, and thereby equalize the temperature rise of each part of the machine frame and stator core, and reduce the temperature rise of the entire rotating electric machine. can.

In the sealed rotating electric machine according to claim 2, the height of the cooling fins in a portion of the machine frame corresponding to the arc portion of the stator core is larger than that of the cooling fins in a portion of the machine frame corresponding to the notch portion of the stator core. Since it is set so that It is possible to equalize the temperature rise of each part of the iron core and to reduce the temperature rise of the entire rotating electric machine.

The rotating electric machine according to claim 3 is provided with a plurality of cooling fins only at a portion of the machine frame corresponding to the arc portion of the stator core,
Since each cooling fin is set so that the height dimension of the central part is maximum, it is possible to increase the heat dissipation effect of the stator frame part corresponding to the arc part of the stator core, and to reduce the heat generated in the stator core. This can be quickly dissipated, thereby making it possible to equalize the temperature rise in each part of the machine frame and stator core.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a vertical side view, FIG. 2 is a vertical front view, and FIG. 3 is a manufacturing process for punching a stator core. 4 is a perspective view of the stator core, and FIGS. 5 and 6 are views corresponding to FIGS. 1 and 2, and FIGS. 7 and 6 are views showing the second embodiment of the present invention. 8 is a view corresponding to FIGS. 1 and 2 showing a third embodiment of the present invention, FIG. 9 is a view corresponding to FIG. 1 showing a fourth embodiment of the present invention, and FIG. 11 are views corresponding to FIGS. 1 and 2 of the first conventional example, and FIGS. 12 and 13 are views equivalent to FIGS. 1 and 2 of the second conventional example. In the figure, 20 is a machine frame, 21 is a stator frame, 26 is a stator core, 26c is a flat part (notch part), 26d is an arcuate part, 33 and 37 are cooling fans, 36a to 36e, 41a to 4
1e, 42, 43a to 43e, and 44a to 44h indicate cooling fins. Agent Patent Attorney Noriyuki Chika

Claims (1)

[Scope of Claims] 1. A stator core consisting of a circular arc portion and a cutout portion is fitted into a machine frame, and a cooling fan is provided inside the machine frame, wherein the stator core is included in the outer peripheral portion of the machine frame. A rotating electric machine characterized in that a plurality of cooling fins are provided only in portions corresponding to the arc portions of the rotating electrical machine. 2. In a closed type stator core consisting of a circular arc portion and a cutout portion is fitted into a machine frame having a large number of cooling fins on the outer periphery, and a cooling fan is provided outside to blow air to the cooling fins, A rotating electrical machine characterized in that the cooling fins at the portions corresponding to the arcuate portions of the stator core are set larger in height than the cooling fins at the portions corresponding to the notches of the stator core. 3. In a machine frame in which a stator core consisting of an arcuate portion and a notch is fitted and a cooling fan is provided inside, a part of the outer circumferential portion of the machine frame that corresponds to the arcuate portion of the stator core 2. The rotating electric machine according to claim 1, wherein a plurality of cooling fins are provided only at one portion, and each cooling fin is set such that the height dimension of the central portion thereof is maximum.