JPH0122376Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a totally enclosed rotating electrical machine equipped with a fan for external ventilation on the upper part of the opposite load side.

Fig. 1 shows a conventional example of this type of rotating electric machine. In the figure, 1 is a rotating shaft, 2 is a rotor core, 3 is an end ring, 4 is a stator core, 5 is a stator coil, 6 is a frame, and 7 is a rotary electric machine. is a load side bracket, 8 is an anti-load side bracket, 9 is a load side bearing, 10 is an anti-load side bearing, 11 is an external ventilation fan for cooling the motor, 12 is connected to the anti-load side bracket 8,
A fan mounting cover that supports the external ventilation fan 11 on the upper part; 13, a speed detection generator fixed to the outside of the fan mounting cover 12 and supported on the end of the rotating shaft 1; 14, an end cover; A frame cover 15 covers the outer circumference of the frame 6 and forms a ventilation passage 16 between the frame 6 and the frame 6.

With the above configuration, the inside of the motor becomes high temperature due to the heat generated during operation, but by operating the external ventilation fan 11, cooling air is drawn from the load side of the ventilation passage 16 as shown by arrow A. , after cooling the outer periphery of the frame 6, the external ventilation fan 1
Discharge above 1. Further, the cooling air that has cooled the lower half of the outer periphery of the frame 6 cools the outer surface of the anti-load side bracket 8 and is then discharged to the outside. In addition,
A heat dissipation fin 7a is provided on the outer periphery of the load side bracket 7.
is provided, and is cooled by cooling air drawn into the ventilation passage 16.

As described above, the temperature rise inside the electric motor during operation is reduced, but since the load applied to the bearings 9 and 10 is larger on the load side, the load side bearing 9 is normally used in comparison with the counter-load side bearing 10. Although the capacity is set to be large, the load side bearing 9 is hardly cooled by cooling air, so it becomes high temperature, and the bearing life is shortened due to deterioration of the lubricating grease, which may lead to ball burnout accidents. It was hot.

The purpose of this invention is to improve the above-mentioned drawbacks of the conventional fully enclosed rotating electric machine that is equipped with a fan for external ventilation at the upper part of the opposite load side.

An embodiment of this invention will be described below with reference to FIGS. 2 and 3. In the figure, the same reference numerals as in FIG. 1 indicate the same or equivalent parts, and 17 is a load side bracket, which has a plurality of cooling fins 17a formed on the load side end surface, and a part 17 of the cooling fins 17a.
b extends in the outer circumferential direction, and constitutes an outer circumferential plate 17c whose ends are integrally connected. In addition, the outer peripheral plate 17c
The outer diameter of the intake port 18 is made to match the outer diameter of the frame cover 15 to draw cooling air into the inner circumference.
form.

With the above configuration, the heat dissipation area of the load side bracket 17 is increased, and the heat dissipation fin 1 is
7a, 17b and the outer peripheral plate 17c are cooled,
The temperature rise of the load-side bracket 17 is reduced, and the temperature of the load-side bearing 9 is also reduced accordingly.

As described above, according to this devised device, in a fully enclosed rotating electrical machine equipped with a fan for external ventilation at the upper part of the opposite load side, the heat dissipation area of the load side bracket is increased, so that the heat dissipation area of the load side bracket and the load side bearing is increased. This has the effect of reducing temperature rise and improving reliability.

[Brief explanation of drawings]

FIG. 1 shows a conventional example, a front view showing a cross section of the upper half, FIGS. 2 and 3 show an embodiment of the invention, and FIG. 2 is a front view showing a cross section of the upper half. FIG. 3 is a side view. In the figures, the same reference numerals indicate the same or equivalent parts, 1 is the rotating shaft, 2 is the rotor core, 4 is the stator core, 6 is the frame, 8 is the anti-load side bracket,
9 and 10 are bearings, 11 is a fan for external ventilation, 12
15 is the fan mounting cover, 15 is the frame cover,
16 is a ventilation path, 17 is a load side bracket, 17
a, 17b are heat radiation fins, 17c is an outer peripheral plate, 18
is the intake port.

Claims (1)

[Scope of utility model registration request] A frame 6 to which a stator core is fixed, a rotating shaft 1 to which a rotary core is fixed, a load side bracket 17 and an anti-load side bracket 8 that support this rotating shaft 1 via bearings and are fixed to both sides of the frame 6, A frame cover 1 that covers the outer periphery of the frame 6 and forms a ventilation passage 16 between the frame 6 and the frame 6.
5. A fan 11 for external ventilation that sucks cooling air from the load side of the ventilation passage 16, and a fan mounting cover 12 that is connected to the anti-load side bracket 8 and supports the fan 11 for external ventilation on the upper part. In the fully enclosed rotating electrical machine, a plurality of cooling fins 17a, 17b are formed radially on the load side end surface of the load side bracket 17, and a portion 17b of these cooling fins is extended in the outer circumferential direction so that the end thereof is An intake port 18 is connected integrally to form an outer circumferential plate 17c, and is connected to the air passage 16 between the outer circumferential plate 17c and the outer circumferential surface of the load side bracket 17.
A totally enclosed rotating electrical machine characterized by forming: