JPS58222755A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To improve the cooling effect of a rotary electric machine by arranging a vent guide plate having the prescribed angle inclination to a vent guide in a suction chamber, thereby increasing the suction air amount to a core and a coil. CONSTITUTION:An external fan 15, fans 7, 8 and a rotor core 4 are rotated upon rotating of a rotor shaft 6, heat exchange is performed between outer air and inner air in an air cooler 16, and cooled inner air is sucked from suction ports 19, 21 into suction chambers 20, 22. Cooling air sucked into the chamber 20 is effected by a force which intends to produce swivel flow by the centrifugal effect of the fan 7, but altered toward axial direction in contact with a vent guide plate 23 to be flowed toward a fan 7 side, and swivel flow is not almost produced. Since the interval between the plate 23 and the guide 9 is gradually narrowed toward the downstream side, cooling air is accelerated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cooling device for a rotating electric machine.

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2. In the figure, (1) is a stator core, (2) is a clamper that clamps this stator core (1), (3) is a stator coil wound around the stator core (1), and (4) is a Rotor core, (5) is end ring, (7) (8) H
The fan (6) is a rotor shaft on which the rotor core (4) and the fans (7) and (8) on both sides are attached, and (9) is a rotor shaft that is attached to the clamper (2) and has an opening (9a). This is a ventilation guide with a shape that covers the stator coil end. (10) A frame that supports the LDD stator core (1), (11) and (13) are brackets, and (12) is a shroud that covers between the ventilation guide (9) and bracket (11), as shown in Figure 2. As shown, the bottom plate (12a) and this bottom plate (
12a) and a pair of wall plates (121)) provided vertically upward from both ends of the wall plate 12a).

(14a) is a bottom plate, and together with a wall plate (not shown) constitutes a surrounding plate on the external fan (15) side.

(16) is an air cooler placed on the upper part of the frame (10), and has a large number of cooling pipes (17). (1
8) is an external fan cover placed at the other end of the frame (10), (19x21) ld each way ventilation guide 9) has a cooling air suction port formed on the outer surface side, and (+) is a ventilation guide (9). ) and Glaken) (11) is a cooling air suction chamber formed between the cooling air guide (9) and the bracket (13).

The ventilation guide (9) has at its center an opening (9a) formed close to the fan (7). Frame (10
) at the end of the bottom plate (
12a) and both wall plates (121)X12b). This shroud (1
2), a ventilation guide (9), and a bracket (11) to form a suction chamber (20). Similarly fan (8)
A suction chamber (22) is also formed on the side.

In the above-mentioned rotating electric machine, the cooling air from the external fan (15) passes from the external fan cover (I8) through the numerous cooling pipes (17) in the air cooler (16) and is discharged from the axial end. . On the other hand, as the rotor shaft (6) rotates, the fan (
7) (8) and the rotor core (4) rotate, and as shown by the arrows in Figures 1 and 2, the inside air, which has had heat removed from the outside air in the cooling pipe (17), flows into the suction port (19). From the suction chamber (21
J) into the opening (9a) of the ventilation guide (19).
), a part of it passes through the fan (7) and the stator coil (3
), and the other part advances in the axial direction from the inner circumferential side of the rotor core (4), passes through core ventilation ducts A and B, and enters the air cooler ( 16) People inside are cooled from the outside air. Similarly, on the fan (8) side, the air inside the suction chamber (22) circulates and flows through the rotating electric machine body and the air cooler (16).

However, as shown in Figure 2, the suction chamber (
20) The cooling air sucked into the fan (7) as shown by the arrow C rotates as shown by the arrow DID due to the centrifugal effect caused by the rotation of the fan (7). A part of the suction flow is changed in direction as shown by E as the fan (7) rotates, and is discharged from the suction port (19) as shown by arrow F. In addition, the cooling air sucked into the blades of the fan (7) and the inner periphery of the rotor core (4) must change its direction from the radial direction to the axial direction, but due to the inertia of the swirling flow. It was extremely difficult to change the direction of flow, which resulted in an apparent increase in ventilation resistance, making it impossible to efficiently cool the core and coils.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by providing a ventilation guide plate opposite to the ventilation guide in the suction chamber, the flow of cooling air can be made smoother and the cooling effect can be enhanced. The purpose is to provide rotating electric machines.

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. In the figure, (1) to (22) are the same as the conventional one, so their explanation will be omitted. (23) is the suction chamber (2
0), and is provided opposite to the axial end surface of the ventilation guide (9) so as to have an inclination of a certain angle with respect to the suction port (19), and this ventilation guide The distance between the plate (23) and the ventilation guide (9) is the same as the suction port (1
9) side is wide, and the opposite bottom plate (12a) side is narrow. The ventilation guide plate (23) has both wall plates (1
2bX12k)), and a through hole for the rotor shaft (6) is formed in the center. Similarly, a ventilation guide plate (24) is provided within the suction chamber (22).

Next, the effect will be explained. As the rotor shaft (6) rotates, the external 7-ang (15), 7-ang (7) (8) and the rotor core (4) rotate, and the air cooler (16) creates a gap between outside air and inside air. heat exchange takes place, and the cooled internal air flows from the suction port (19) (21) to the suction chamber (20) (22
) is the same as the conventional one. The cooling air sucked into the suction chamber (K) is subjected to a force that tries to create a swirling flow due to the centrifugal effect of the fan (7), but when it hits the ventilation guide plate (23), its direction is changed in the axial direction. Ann (7
) side, and almost no swirling flow occurs. Since the distance between the ventilation guide plate (23) and the ventilation guide (9) gradually narrows toward the downstream side, as shown in Bernoulli's theorem, cooling occurs as the ventilation cross-sectional area decreases. Since the wind is distorted and further oriented in the axial direction as described above, the axial velocity component increases. Therefore, ventilation loss in the ventilation path between the inner periphery of the rotor core (4) and the rotor shaft (6) is also reduced.

As a result, the amount of circulating air increases, swirling flows and secondary flows are less likely to occur, and the stator core (1) and coils (
The non-uniformity of the axial temperature distribution in 3) can be corrected, and the overall temperature can also be kept low.

In addition, in the double suction ventilation system in which cooling air is sucked in from both sides 1811 of the iron core and discharged from the back of the stator core as shown in Fig. 1, the wind speed in each ventilation duct of the iron core (
In other words, the airflow rate) may be extremely unbalanced (VcfX). In Figure 3, the horizontal axis is the axial dimension of the core shown in Figure 1, and the vertical axis is the wind speed of the ventilation duct at the back of the stator core.As shown in the figure, the wind speed of each ventilation duct is There is an unbalanced state in which the air pressure is low on the fan (7) side and high on the fan (8) side.

This is caused by some reason, for example, the pressure and air path resistance of both fans are not necessarily equal. In this example, the pressure on the fan (7) side is higher and
This is an abnormal phenomenon that occurred because the amount of air sucked into the inner periphery of the rotor core (4) from the ) side was extremely large compared to that from the fan (8) side.

If there is an extremely non-uniform wind speed distribution in each ventilation duct as shown in FIG. 3, the temperature distribution of the stator coils will show a large difference, and as a result, the life of the windings will be significantly shortened.

In the above-mentioned double suction ventilation system, if ventilation guide plates C23) (24) are provided in each suction chamber as shown in Fig. 4, the suction air volume from both sides of the iron core is almost equalized, as shown in Fig. 6. As shown in Figure 3, the wind speed in the ventilation duct of the iron core is averaged, making it difficult for abnormal phenomena like the one shown in Figure 3 to occur. In addition, air is sucked into the ventilation passage on the inner circumference of the rotor core (4).
/i increases compared to when an abnormal phenomenon occurs, and as a result, the temperature of the coil is made uniform, the overall temperature is lowered, and the life of the winding is increased.

In the above embodiment, the ventilation guide plate was flat, but
It may be curved. Further, although the above embodiments have been explained in the case of an external fan-shaped rotating electric machine, it goes without saying that the same young fruit can be obtained even when applied to an open type machine or the like.

As described above, according to the present invention, since the ventilation guide plate having an inclination of a predetermined angle relative to the ventilation guide is arranged in the suction chamber, the cooling air is prevented from swirling back toward the suction port in the suction chamber. As a result, the amount of air sucked into the iron core and coils increases, improving the cooling effect. −

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing a conventional external fan-shaped rotating electric machine, Fig. 2 is a cross-sectional view taken along the line 1 in Fig. 1, and Fig. 3 shows the wind speed distribution in the first duct of the iron core in Fig. 1. 4 is a longitudinal sectional view showing an external fan-shaped rotating electric machine according to an embodiment of the present invention, FIG. 5 is a sectional view taken along line V-V in FIG. 4, and FIG. It is a figure showing wind speed distribution in a duct. (1) l' is the stator core, (3) is the stator coil, (
4) is the rotor core, (6) is the rotor shaft, (7) (8)
h Fan, (9) is ventilation guide, (10) is frame, (19) (21) is suction port, (2t)) (22)
1- is a suction chamber, (23) and (24) are ventilation guide plates. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Makoto Kuzuno - Figure 1 Figure 2 Figure 5 Figure 4 Procedural amendment (method) 2. Name of the invention Rotating electric machine 3. Relationship with the tenant making the amendment 1. n'"Applicant No. 3 No. 3 ■ 5. Date of amendment order: May 25, 1980 (shipment date) 6. Drawings subject to amendment (Figures 1.8, 4.6) 7. Contents of amendment As shown in the attached sheet Figure 1 3 Figure 4 Thief - Jiang H6 715 4 hair Jjii 11-duo, %I15 Figure 4 Figure 6

Claims (1)

[Claims] A stator core around which a stator coil is wound, a frame that supports this stator core, a rotor shaft to which a rotor core and a fan are attached, and an annular ventilation guide that covers the stator coil end portion. In a rotating electric machine, the rotating electric machine is configured to cool the rotor core, stator core, and coils by sucking cooling air from the outer surface side suction port of the ventilation guide by the fan, The rotating electric machine is characterized in that a ventilation guide plate is provided with an inclination of a predetermined angle such that the distance from the ventilation guide is wide on the side of the suction port and narrow on the side opposite to the suction port.