JP5677151B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

  The rotating electrical machine needs to be cooled because it generates heat due to loss of the rotor and stator. Patent Document 1 discloses a fully-enclosed rotating electrical machine, which includes an outer fan fan on a rotating shaft on the end bracket side of the motor, and cools the outer fan by sending air to the outer peripheral portion of the frame. .

JP-A-11-289716

  In a rotating electrical machine, a stator or a rotor serves as a heating element, and thus it is required to cool them. This is particularly noticeable in a rotating electrical machine having a structure in which a heating element is covered with a frame or the like. In the rotating electric machine, a cooling fan (outer fan fan) is attached to a rotating shaft that protrudes out of the frame, and cooling is performed by flowing air over the surface of the frame. Such a rotating electric machine is also called a jacket cooling type, and is a cooling method used in a fully-closed rotating electric machine that does not actively communicate internal and external air.

  In many cases, the outer fan is formed by integrally forming a blade portion, a boss portion to be attached to a rotating shaft, and a rectifying guide plate.

  The amount of air required for cooling of a rotating electrical machine changes due to specification changes. For example, when variable speed operation is performed using an inverter, the air volume is adjusted by changing the outer fan itself in the above structure, so that it may be difficult to finely adjust the air volume and it may be difficult to obtain optimal cooling performance.

  Therefore, the present invention provides a rotating electrical machine that can obtain optimum cooling performance by adopting an external fan fan structure that can finely adjust the air volume according to the specifications of the rotating electrical machine.

In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. For example, an end bracket to which a frame that covers the rotor and the stator and a bearing that supports the rotating shaft fixed to the rotor is attached. A fan cover that covers the end of the rotating shaft protruding from the end bracket and has an opening at a position facing the end of the rotating shaft, and is located on the frame side of the opening, and the end bracket A set of a plurality of blade members each having a discharge port for discharging air from the space surrounded by the fan cover to the outer peripheral portion of the frame and detachable from the outer periphery of the rotating shaft end protruding from the end bracket. A rotating electrical machine in which at least one of the groups is arranged along the direction of the rotation axis .

  According to the present invention, it is possible to finely adjust the air volume according to the specifications of the rotating electrical machine, and a desired cooling performance can be obtained.

  Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

1 is a structural diagram of a rotating electrical machine provided with the present embodiment. The principal part enlarged view of the rotary electric machine provided with the present Example. The figure which shows the shape of the external fan of a present Example. The figure which shows the other shape of the external fan fan in a present Example. FIG. 6 is a structural diagram of a rotating electrical machine of a comparative example. The principal part enlarged view of the rotary electric machine of a comparative example. The figure which shows the shape of the external fan fan used as a comparative example. The figure which shows the other shape of the external fan fan in a present Example. The figure which shows the other shape of the external fan fan in a present Example.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

  In this embodiment, an example of an external fan that allows fine adjustment of the air volume by attaching and detaching divided blades will be described. FIG. 1 is a structural diagram of a rotating electrical machine according to this embodiment, and FIG. 2 is an enlarged view of a main part thereof.

  First, the overall configuration of a rotating electrical machine according to an embodiment of the present invention will be described with reference to FIG. The frame 1 is formed in a substantially cylindrical shape from cast iron, aluminum, a thin steel plate, etc., and constitutes the outer casing of the rotating electrical machine. For the purpose of improving the cooling performance, radiating fins 1a are often provided on the outer periphery of the frame 1. The end brackets 2A and 2B are attached to the opening portions on both sides of the frame 1 by using inlay fitting or the like. As described above, the rotating electrical machine according to the present embodiment is a fully-enclosed and jacket-cooled rotating electrical machine in which the inside is substantially sealed by the frame 1 and the end brackets 2A and 2B and there is no positive communication between the inside and outside air. .

  Next, the cooling structure by the external fan 4 will be described with reference to FIG. Since the external fan 4 is fixed to the rotating shaft 3, it rotates in synchronization with the rotation of the rotating shaft 3. Since this outer fan 4 is mounted outside the sealed space, it is covered with a cover (hereinafter referred to as “fan cover 5”). The rotating electric machine is cooled by the outside fan 4 rotating to take in outside air from the opening 5a of the fan cover and flow the air taken in from the outlet 5b toward the outer periphery of the frame 1.

  FIG. 3 is a view showing the shape of an external fan used in the rotating electrical machine of this embodiment. In the present embodiment, the blade 4a, the boss portion 6 and the guide plate 8 constituting the outer fan 4 are separate parts, and the blade 4a has several blade members 7 divided into the circumferential direction of the rotary shaft 3, the shaft Arbitrary number of blade members 7 are attached to a plurality of attachment structures 12 provided in the direction to form one blade 4a. Thereby, the blade member 7 required for cooling can be used, and desired cooling performance can be obtained.

  3 shows an example in which a groove is used as the mounting structure 12, but the mounting structure 12 is not limited to this. For example, as shown in FIG. It is also possible to stop.

4 to 6 show the structure of a rotating electrical machine of a comparative example. At present, most of the external fan 4 used in rotating electrical machines is manufactured by resin injection molding or the like. FIG. 6 is a view showing the shape of an external fan 4 as a comparative example. That is, it is an external fan 4 that is often used in conventional rotating electrical machines, and this shape is composed of a blade 4a, a boss portion 6 (hereinafter referred to as a boss portion) for attachment to the rotary shaft 3, and a rectifying guide plate 8 (hereinafter referred to as a guide plate). Since it has an integrated structure and it is desired to change the air volume for cooling the rotating electrical machine, the external fan 4 itself is changed, so that the air volume cannot be finely adjusted.

On the other hand, in this embodiment, since the air volume can be adjusted by the external fan 4 , the cooling performance in accordance with the usage mode of the rotating electrical machine is obtained as compared with the conventional example (comparative example) shown in FIGS. be able to.

  In this embodiment, an example of the outer fan 4 that can be easily rotated in one direction by changing the mounting position of the divided blade member 7 will be described.

  In the case of a general-purpose rotating electrical machine, the rotating direction of the shaft of the rotating electrical machine is a target of selection in both clockwise and counterclockwise directions, and the rotating electrical machine is required to exhibit the same performance in both directions of rotation. Therefore, it is essential that the fan has the same performance in both directions of rotation. Therefore, the blade shape of the outer fan 4 is often a radial fan shape in which the blades 4a are arranged radially.

  On the other hand, by adding a twist to the blade 4a, the outer fan fan 4 can secure the air volume even if the outer fan fan 4 is downsized.

  FIG. 8 is a diagram showing the shape of the outer fan 4 according to this embodiment. A plurality of attachment structures 12 of the blade members 7 provided on the rotary shaft 3 shown in FIG. 3 are provided so as to be adjacent to each other in the rotation direction, and apparently by shifting the attachment positions of the blade members 7 attached in a row in FIG. With the structure in which the blades 4a are twisted, the air volume can be secured.

  Moreover, since the structure of the present embodiment is based on the premise that the blade member 7 can be attached and detached, it is natural that when the blade member 7 is attached, the shifting method in FIG. 8 is shifted in the direction opposite to the rotation direction. Is possible. Therefore, since it becomes possible to easily cope with a reverse rotation operation as in FIG. 8, a desired air volume can be secured even when the rotating electrical machine rotates in the reverse direction. Further, as can be seen from FIG. 8, when the mounting structure is a groove, the blade member 7 can be easily shifted without a gap when the mounting positions are adjacent.

  In addition, regarding the attachment method of the blade member 7, you may attach not only the said method but a well-known method.

  In the structure of the above embodiment, a more preferable structure will be described. Specifically, the attachment structure 12 of the blade member 7, that is, a structure in which the attachment portions (grooves) are not provided radially with respect to the axial center, but a pair of adjacent attachment portions is provided perpendicular to the axial center.

  An example will be described with reference to FIG. In this example, the attachment structure 12 corresponding to one blade 4a is composed of three grooves. These three grooves are not formed radially from the axial center, but are parallel to each other. In other words, adjacent mounting structures 12 are not installed perpendicular to the axis center, but a set of several adjacent mounting structures is perpendicular to the plane passing through the axis center. It is said.

  As a result, the gap between the blade members 7 attached to the three grooves can be reduced. Therefore, when the blade member 7 has a twisted structure as in the second embodiment, it can function as one blade 4a. Become.

  The above configuration is based on the premise that a rotating electrical machine capable of rotating in both directions is used in one direction in an actual usage mode, and an external fan fan secures an air volume corresponding to the one direction. In this way, the blade member 7 is attached.

  On the other hand, when bi-directional rotation is required even in an actual usage mode, it is not preferable that there is a difference in cooling performance depending on the rotational direction. In this case, the blade member 7 is attached to a groove passing through the center point among a plurality of adjacent attachment structures. By doing in this way, it becomes possible to attach the blade | wing 4a radially from an axial center, and it can be set as the structure which does not produce a performance difference with a rotation direction. In the example of FIG. 8, since the central groove is formed radially from the center of the three grooves, it is preferable to use the central groove.

  In the present embodiment, an example of the outer fan 4 that has a structure that makes it possible to stabilize the blades 4a that have become unstable due to the division, with respect to the outer fan 4 having the shape shown in the first and second embodiments. explain.

  By dividing the blade 4a and attaching it directly to the rotary shaft 3, the blade 4a becomes unstable, and there is a possibility that strength reduction, vibration noise, dropping of the blade member 7, etc. may occur.

  FIG. 9 is a view showing the shape of the outer fan 4 according to this embodiment and a ring-shaped plate (hereinafter referred to as a ring-shaped plate) 9 for fixing blades. The shape of the outer fan 4 is the same as that shown in FIG. The contact surface between the ring-shaped plate 9 and the blade 4a has a structure in which the blade can be fixed regardless of the number of the blades 4a in the circumferential direction. For example, it is preferable to provide at least the same number of grooves as the blade mounting structure.

  By attaching the ring-shaped plate 9 and the blade 4a, it becomes an apparently integrally molded product, and the blade 4a can be stably fixed.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Frame, 1a ... Radiation fin, 2 (2A, 2B) ... End bracket, 3 ... Rotating shaft, 4 ... Outer fan fan, 4a ... Outer fan fan blade part, 5 ... Cover, 5a ... Opening part of cover 5b ... discharge port of cover, 6 ... boss, 7 ... blade member, 8 ... guide plate, 9 ... ring plate, 12 ... blade mounting structure.

Claims (8)

A frame covering the rotor and the stator;
An end bracket to which a bearing supporting a rotating shaft fixed to the rotor is attached;
A cover that covers the end of the rotary shaft protruding from the end bracket and has an opening at a position facing the end of the rotary shaft;
Located on the frame side of the opening, and a discharge and mouth for discharging the air from the space enclosed by said cover and said end bracket to the outer periphery of said frame,
A rotating electrical machine in which a plurality of blade members each detachable from an outer periphery of a rotating shaft end projecting from the end bracket are used as a set, and at least one set is disposed along the rotating shaft direction . In the rotating electrical machine according to claim 1,
A rotating electrical machine in which a plurality of sets of blade members are arranged adjacent to each other in the circumferential direction of the end portion of the rotating shaft. The rotating electrical machine according to claim 2,
A rotating electrical machine in which a plurality of sets of blade members are arranged adjacent to each other at equal intervals in the circumferential direction of the rotating shaft end portion. In the rotary electric machine according to any one of claims 1 to 3,
A rotating electrical machine in which each of the blade members forming a set of the plurality of blade members is arranged in parallel with the same plane passing through the axis of the rotation shaft. In the rotating electrical machine according to any one of claims 1 to 4,
A rotating electrical machine in which each of the blade members forming the set of the plurality of blade members is displaced in the same circumferential direction according to the arrangement order of the rotation axis direction. In the rotating electrical machine according to any one of claims 2 to 5,
The axial center and the hole center of the rotating shaft end are the same,
A rotating electrical machine in which an inner diameter is larger than a shaft diameter and a ring that can be attached in the frame direction from the cover side joins a part of the plurality of blade members. In the rotating electrical machine according to any one of claims 1 to 6,
A rotating electrical machine having a groove for attaching each blade member forming the set of the plurality of blade members on an outer periphery of the rotation shaft. In the rotating electrical machine according to any one of claims 1 to 7,
A rotating electrical machine in which the plurality of blade members are attached to the outer periphery of the rotating shaft by bolts.

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