JPS622933Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a fully enclosed electric motor that is equipped with a cooling fan that sucks cooling air from the load side to the anti-load side, and has an electric device such as a speed generator attached to the anti-load side bracket. be.

BACKGROUND ART Conventionally, in a totally enclosed electric motor that is equipped with a cooling fan on the anti-load side for cooling the outer circumference of the motor, the direction of the cooling air is generally from the anti-load side toward the load side. However, when the load is directly connected to and drives a machine tool, for example, it is undesirable for the cooling air whose temperature has increased due to cooling of the motor to be directed toward the load, as this may affect machining accuracy. In such a case, it is required to change the direction of the cooling air from the load side to the anti-load side.

Figure 1 shows a conventional example of a fully enclosed, externally cooled electric motor with a speed generator installed on the opposite side of the load, which is used in such cases. A side bracket, 2 is a frame provided with axial cooling fins 2a on the outer periphery, 3 is an anti-load side bracket, 4 is a speed generator supported by the anti-load side bracket 3, 5 is provided on the anti-load side, A cooling fan sucks cooling air from the load side as shown by arrow A and cools the outer periphery of the frame 2. Reference numeral 6 denotes an outer fan cover that covers the outer periphery of the frame 2 and guides the cooling air.

With the above structure, cooling air is sucked in from the load side as shown by arrow A, and cools the electric motor via the cooling fins 2a on the outer periphery of the frame 2.
The air is discharged from the opposite-load side exhaust port 6a of the outer fan cover 6. By the way, when using such a ventilation method, air heated by the heat generated by the electric motor passes through the outer periphery of the speed generator 4, so the ambient temperature rises and the cooling of the speed generator 4 is reduced. There were drawbacks such as insufficient performance and malfunction.

The purpose of this invention is to improve the drawbacks of the conventional ones as described above.

An embodiment of this invention will be described below with reference to FIGS. 2 to 4. In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts, and 7 is a fan guide that is spaced at a predetermined distance from the outer circumference of the speed generator 4;
One of the openings of the fan guide 7 is closed by the anti-load side bracket 3, and the other opening faces the cooling fan 5. Reference numeral 8 denotes a cylindrical body that penetrates the outer fan cover 6 from the outer circumferential direction and guides cooling air into the fan guide 7. In addition, in the figure, fan guide 7
Although one tubular body 8 is shown attached to the outer periphery of the tube, a plurality of tubular bodies 8 may be attached at appropriate intervals as necessary.

With the above structure, the cooling air sucked from the load side passes between the cooling fans 2a of the frame 2, as shown by arrow A, and then passes between the cylindrical bodies 8 along the outer periphery of the fan guide 7. The air is sucked into the cooling fan 5 through the cooling fan 5 and discharged through the exhaust port 6a of the outer fan cover 6. On the other hand, the cooling air sucked in from the outer circumferential direction is guided by the cylindrical body 8 and into the fan guide 7 as shown by arrow B, cools the outer circumference of the speed generator 4, and is sucked into the cooling fan 5. The air is combined with the cooling air sucked from the load side and is discharged from the exhaust port 6a.

In the above embodiment, a speed generator is used as the electrical device supported by the anti-load side bracket, but the invention is not limited to this, and any electrical device in which overheating is undesirable can be implemented to achieve the same effect. I can get it.

As described above, according to this invention, a fan guide is provided to cover the outer periphery of the electrical equipment supported on the opposite side of the load, and air heated by the electric motor from the load side is guided to the cooling fan on the outside of the fan guide. Since the cooling air is not allowed to pass through the electric device and is supplied from the outer circumferential direction into the fan guide through the cylindrical body, overheating of the electric device can be prevented and normal function can be maintained.

[Brief explanation of the drawing]

Fig. 1 shows a conventional example, a front view showing the outer fan cover cut away, and Figs. 2 to 4 show an embodiment of this invention. FIG. 3 is a front view, side view, and plan view of the main part, and FIG. 4 is a perspective view of the main part. In the figures, the same reference numerals indicate the same or equivalent parts, 2 is the frame, 3 is the load side bracket, 4 is the
5 is a speed generator, 5 is a cooling fan, 6 is an outer fan cover, 7 is a fan guide, and 8 is a cylindrical body.

Claims (1)

[Scope of utility model registration request] A cooling fan that is installed on the opposite load side and sucks cooling air from the load side in the axial direction, an outer fan cover that covers the outer periphery of the frame and guides the cooling air from the load side to the cooling fan, and a bracket on the opposite load side. an electrical device supported by the electrical device; and a fan guide that guides the cooling air guided by the outer fan cover from the load side to the cooling fan, and guides the cooling air supplied from the cylindrical body inside to the cooling fan. Features a fully enclosed electric motor.