JP6764823B2 - Rotating electric machine - Google Patents

Description

An embodiment of the present invention relates to a rotary electric machine having an improved ventilation cooling structure.

Generally, in a rotary electric machine such as a generator, a cooler is integrally provided on the frame of the rotary electric machine main body, hot air generated in the rotary electric machine main body is guided to the cooler, and cooled air is returned to the inside of the rotary electric machine main body. A circulation type cooling method is adopted. In this method, since air is circulated between the main body of the rotary electric machine and the cooler to cool it, it can be configured as a fully closed type that shuts off the outside air, and has features such as being able to install in any environment.

However, on the other hand, since the cooler is integrally provided on the frame of the rotating electric machine body, the overall structure becomes large and heavy.

Recently, there is a demand for so-called mobile power generation equipment in which power generation equipment is installed in a trailer container. As described above, when the power generation equipment is mounted on the trailer, the generator is required to be small and lightweight.

Japanese Unexamined Patent Publication No. 2016-88315

This is because the weight and shape of a fully closed rotary electric machine that integrally has the above-mentioned cooler are large when used as a generator. It was difficult to mount it in a trailer container and configure it in a mobile manner.

An object of the present invention is to provide a rotary electric machine having a sufficient ventilation cooling function and capable of being compact and lightweight.

The rotary electric machine according to the embodiment of the present invention is a rotary electric machine having a rotor integrated with a rotating shaft and a stator arranged so as to face the outer periphery of the rotor, and surrounds the outer periphery of the stator. A bearing that supports the rotating shaft is provided on the end face portion, and a frame having an intake port formed around the bearing on the end face portion and a funnel shape are formed, and the inner surface of the funnel shape is the intake port. In a state of facing each other, the outer circular edge portion is attached to the inner surface of the end face portion of the frame, the inner circular portion is arranged at a distance from the outer circumference of the rotating shaft, and the rotation of the inner fan provided on the rotating shaft. Along with this, the cooling air taken in through the intake port is provided with an air guiding member that guides the air through the axial direction of the rotor .
The air guide member is divided into a plurality of parts, and each of these divided parts is tangentially formed on the leeward side of the cooling air at a portion that comes into contact with each other when assembled into the funnel shape, and is joined to each other. It is characterized in that a piece is provided .

According to this embodiment, the outside air is efficiently taken in to enhance the internal cooling effect, the size and weight can be reduced, and it can be applied to various applications.

It is a front view which shows the end face part of the rotary electric machine which concerns on one Embodiment of this invention. It is a partial cross-sectional view which shows the internal structure at the end part of the rotary electric machine shown in FIG. It is a perspective view which shows the shape of the baffle plate used in the rotary electric machine shown in FIG. The shape of the baffle plate shown in FIG. 3 is shown, (a) is a front view, and (b) is a side view.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In this embodiment, as an example of a rotary electric machine, a brushless generator installed in a container of a trailer or the like is illustrated, FIG. 1 shows an end face shape of one end thereof, and FIG. 2 shows FIG. The internal configuration of the shown portion is explained, and the upper half of the side surface is shown as a cross-sectional shape.

The brushless generator (hereinafter, simply referred to as a generator) 11 has a rotor 13 integrated with the rotating shaft 12 and a stator 14 having an inner circumference facing each other with a gap on the outer circumference of the rotor 13. Have. The outer circumference of the stator 14 and the main body of the rotary electric machine including the rotor 13 and the stator 14 are surrounded by the frame 15.

In the figure, 16 indicates the coil end of the stator coil. Reference numeral 17 denotes a cross section of the winding portion of the rotor coil, which is fixed by a retaining ring 18 and an end plate 19.

A bearing 22 is provided on the end surface portion 15a of the frame 15 via a bracket 21, and the rotating shaft 12 is rotatably supported. Further, an intake port 23 is formed around the bearing 22 of the end face portion 15a. An inner fan 24 is integrally attached to the rotating shaft 12 near the bearing 22 in the frame 15, and as shown by an arrow in FIG. 2, cooling is performed via the intake port 23 as the rotating shaft 12 rotates. Inhale the outside air.

Here, the generator 11 in this embodiment is installed in a relatively clean outside air environment such as inside a trailer container as described above, and adopts an outside air introduction type ventilation cooling system. Therefore, exhaust ports (not shown) are formed on both upper side surfaces of the frame 15 facing the upper outer circumference of the stator 14.

A wind guide member 27 is provided near the bearing 22 in the frame 15. The wind guide member 27 has a funnel shape as shown in FIGS. 3 and 4. Then, with the funnel-shaped inner surface (air guide surface) 27a facing the intake port 23, the outer circular edge portion 27b is integrally attached to the inner surface of the end surface portion 15a of the frame 15 as shown in FIG. .. Further, as shown in FIG. 2, the tubular inner circular portion 27c of the air guiding member 27 is arranged at a distance from the outer circumference of the rotating shaft 12. That is, as shown in FIG. 2, the inner circular portion 27c of the wind guide member 27 is located near the outer edge portion of the inner fan 24 attached to the rotating shaft 12. Then, as the inner fan 24 rotates, the cooling air taken in through the intake port 23 is guided along the axial direction of the rotor 13.

The opposite end of the rotating shaft 12 (although the illustration on the right side of the drawing is omitted, the configuration is almost the same as the above-described configuration.

Here, the cross-sectional shape of the wind guide member 27 along the radial direction from the outer circular edge portion 27b to the inner circular portion 27c is an elliptical arc curve. The air guide member 27 is molded from an FRP material using a molding die, but by forming an elliptical arc curve as described above, it can be easily manufactured by applying a known elliptical formula when creating the molding die. This simplifies the manufacturing process. Further, since the air guiding surface 27a of the air guiding member 27 has an elliptical arc shape, the outside air from the intake port 23 can be smoothly guided in a wide range from the outer circular edge portion 27b to the inner fan portion. The ventilation efficiency is improved.

The wind guide member 27 is divided into a plurality of parts. In the example of FIGS. 3 and 4, it is divided into upper and lower parts, and each of the divided parts 27A and 27B is assembled into a funnel shape. A joint piece 27d formed in contact with each other on the leeward side of the cooling air (the back surface side of the air guide surface 27a) is provided at a portion in contact with each other at the time of assembly. In assembling into a funnel shape, these joint pieces 27d are connected to each other.

By forming the joint piece 27d in contact with the leeward side of the cooling air in this way, the air guiding surface 27a has no protrusions and can smoothly guide the air. Further, the distance between the air guide surface 27a and the inner surface of the end surface portion 15a of the frame 15 facing the wind guide surface 27a can be shortened, and the axial dimension of the frame 15 can be shortened.

In the above configuration, the rotation shaft 12 integrated with the rotor 13 also rotates the inner fan 24, and the outside air is introduced from the intake port 23. The introduced outside air is guided along the air guide surface 27a of the air guide member 27, flows from the inner circle portion 27c to the rotor 13 and the stator 14, and is provided on both upper side surfaces of the frame 15 after cooling these. Exhaust to the outside of the machine through an exhaust port (not shown).

Here, since the air guide surface 27a of the air guide member 27 is formed by the curve of the elliptical arc as described above, the outside air from the intake port 23 is widely applied from the outer circular edge portion 27b to the inner fan portion. Can guide the air smoothly and improve the ventilation efficiency.

In addition, since the cooler on the upper part of the frame used in the conventional fully closed type is not used, it is possible to significantly reduce the weight and size. Further, in the case of circulating ventilation with the conventional cooler, ventilation passages for guiding the air from the cooler in the rotation axis direction of the rotating electric machine main body must be provided at both ends in the axial direction of the frame in the axial direction. The size of is getting bigger. However, in the structure according to the embodiment, since the ventilation passages at both ends of the frame for circulating and ventilating the air from the cooler are not required, the axial dimension of the frame can be shortened. This also promotes miniaturization.

In the above embodiment, as the rotary electric machine, a brushless generator installed in a container of a trailer or the like is illustrated, but the present invention is not limited to this, and the present invention is also applied to a general rotary electric machine including an electric motor. can do.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

11 ... Rotating machine 12 ... Rotating shaft 13 ... Rotor 14 ... Stator 15 ... Frame 15a ... End face 21 ... Bracket 22 ... Bearing 23 ... Intake port 24 ... Inner fan 25 ... Exhaust port 27 ... Wind guide member 27a ... Wind guide Surface 27b ... Outer circle edge 27c ... Inner circle 27d ... Joint piece

Claims (2)

A rotary electric machine having a rotor integrated with a rotating shaft and a stator arranged opposite to the outer circumference of the rotor.
A frame that surrounds the outer circumference of the stator and is provided with a bearing that supports the rotating shaft at its end face, and an intake port is formed around the bearing at the end face.
A funnel shape is formed, and the outer circular edge portion is attached to the inner surface of the end face portion of the frame with the inner surface of the funnel shape facing the intake port, and the inner circular portion is spaced from the outer circumference of the rotating shaft. An air guiding member that is arranged while being maintained and that guides the cooling air that is taken in through the intake port as the internal fan provided on the rotating shaft rotates along the axial direction of the rotor.
Equipped with a,
The air guide member is divided into a plurality of parts, and each of these divided parts is tangentially formed on the leeward side of the cooling air at a portion that comes into contact with each other when assembled into the funnel shape, and is joined to each other. A piece is provided,
Rotating electric machine. The rotary electric machine according to claim 1, wherein the cross-sectional shape of the wind guide member along the radial direction from the outer circular edge portion to the inner circle is an elliptical curve.

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