JP6290013B2 - Rotating electric machine - Google Patents

Description

The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine having a cooling configuration in consideration of the relationship with a terminal box.

Generally, as a means for cooling an electric motor which is an example of a rotating electric machine, a method of exchanging heat between the electric motor surface and outside air by flowing cooling air along the electric motor surface is adopted. When the motor is cooled by this method, the cooling effect flows to the maximum along the surface of the motor so that the cooling effect is maximized. On the other hand, it is required to provide an external power cable for supplying power to the motor and a terminal box for connecting the motor to the motor surface. At this time, the terminal box hinders the cooling air flowing along the surface of the electric motor, and there is a problem that effective cooling cannot be performed.
Japanese Unexamined Utility Model Publication No. 60-166252 (Patent Document 1) is known as a background art in this technical field. Patent Document 1 states that “a flat portion is required to provide a seat for attaching a terminal box to a corrugated steel frame that is a stator frame. Therefore, the stator frame has a first frame body having a protrusion and a flat portion. In response to the problem of “need to be manufactured separately from the second frame”, a lead wire insertion hole is provided at the tip of the ridge fin of the frame, and a terminal box seat can be fitted to that portion. "Terminal seat of corrugated steel sheet frame of rotating electric machine" characterized in that the terminal seat thus made is welded.

Japanese Utility Model Publication No. 60-166252

  According to Patent Document 1, a lead wire insertion hole is provided at the tip of a ridge fin of a corrugated steel frame, and a terminal seat is welded to that portion. Therefore, as a result, the second frame body is not necessary, so that the number of fins is increased and the cooling efficiency is improved. However, since the width of the ridge fin is limited by the size of the lead wire insertion hole, the amount of air passing between the ridge fins is limited, and a greater cooling effect cannot be expected. is there.

  When arranging the terminal box on the housing outer peripheral surface side of the rotating electrical machine, it is desired to efficiently cool the outer periphery of the housing.

  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-mentioned problems. To give an example, a cylindrical housing, an output shaft side that supports a rotating shaft rotatably and is joined to both end portions of the housing, and an opposite side. An output shaft side bracket, a cooling fan provided on the side facing the rotating shaft across the bracket on the opposite output shaft side, and cooling air generated by rotation of the cooling fan A fan cover that deflects from the non-output shaft side toward the output shaft side, and a predetermined height from the outer periphery of the housing toward the outer side in the radial direction, and disposed from the counter-output shaft side toward the output shaft side. At least one first plate-like member, and a second plate-like member disposed at a predetermined interval from the first plate-like member, and the top of the first plate-like member is Fixed to the bottom of the terminal box The terminal plate is supported, and the second plate-like member is disposed at a position where the top of the second plate member faces the bottom of the terminal box, and has at least a through hole for drawing out the lead wire of the motor to the outside of the housing. A streamline having one, the side surface in the rotational axis rotation direction of the portion of the second plate-like member provided with the through hole extends from the opposite output shaft side to the output shaft side with the through hole as a center It is a rotary electric machine which has the shape of.

  Furthermore, another example includes a cylindrical housing, a rotation shaft that rotatably supports the output shaft side and the opposite output shaft side brackets that are joined to both ends of the housing, and the opposite output shaft side bracket. An outer fan that is provided on the end of the rotating shaft that passes through and rotates together with the rotating shaft, and cooling air generated by the rotation of the outer fan is deflected from the non-output shaft side toward the output shaft side. A fan cover, at least two having a predetermined height from the outer periphery of the housing to the outer side in the radial direction and arranged from the counter-output shaft side to the output shaft side at a predetermined interval in the rotation direction of the rotary shaft A first plate-like member; and a second plate-like member disposed at a predetermined interval between the first plate-like member, the first plate-like member having a terminal at the top of the head A support member that supports the terminal box by mounting and fixing the box. The second plate-like member is provided with at least one through hole extending from the inside of the housing toward the lead-in hole provided in the terminal box in order to pull out the lead wire of the electric motor; A rotating electrical machine having a streamlined shape in which a side surface in the rotation axis rotation direction of a portion of the second plate-like member provided with the through hole extends from the opposite output shaft side toward the output shaft side with the through hole as a center. It is.

According to the present invention, even when a terminal box is installed on the outer peripheral side of the housing, the surface of the rotating electrical machine can be efficiently cooled.
Other problems, effects, and configurations of the present invention will become apparent from the following description.

It is the side view which showed the partial cross section of the electric motor in Example 1 to which this invention is applied. It is the fragmentary sectional view and partial top view of the electric motor in Example 1. It is the fragmentary sectional view and partial top view of the electric motor in Example 2 to which the present invention is applied. It is the fragmentary sectional view and partial top view of the electric motor in Example 3 to which the present invention is applied.

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

  FIG. 1 is a side view showing a partial cross section of an electric motor according to an embodiment to which the present invention is applied. The electric motor includes a substantially cylindrical housing 1 that supports a stator on an inner cylinder, and brackets 2 and 3 that support both ends of a rotating shaft 7 fixed to the rotor via bearings. This is a radial gap type motor whose part is combined with brackets 2 and 3.

  The side opposite to the output shaft of the rotating shaft 7 penetrates from the bracket 2 to the outside, and the outer end of the rotating shaft 7 rotates around the rotating shaft 7 to generate cooling air for cooling the outer surface of the housing 1. A fan 5 is provided. A fan cover 6 that covers the outer fan 5 is partially fixed to the outer peripheral end of the housing 1 or the bracket 2 by screws or the like. The diameter of the opening on the output shaft side of the fan cover 6 is larger than the diameter of the housing 1, and when the fan cover 6 is partially fixed to the housing 1 or the bracket 2, the cooling air generated by the external fan 5 counteracts the surface of the housing 1. It deflects from the output shaft side to the output shaft side.

  And the outer surface of the housing 1 is provided with the terminal box support part 13 extended with a predetermined | prescribed height in parallel with a rotating shaft, and the several radiation fin 4. As shown in FIG.

  In FIG. 2, the fragmentary sectional view and partial top view of the electric motor in a present Example are shown. 2A is a partial cross-sectional view taken along the line BB ′ of FIG. 1 when the electric motor is observed from the side opposite to the output shaft. FIG. 2B is an electric motor shown in FIG. It is a partial top view in the vicinity of -B ′.

  The terminal box support portion 13 is composed of at least two plate-like members 13a and 13b that extend the outer periphery of the housing 1 in parallel with the rotation axis. The plate-like members 13 a and 13 b are provided at a predetermined interval in the extending direction and the horizontal direction, and form a flow path 14 through which the cooling air A from the outer fan fan 5 flows. And the plate-shaped members 13a and 13b also exhibit the function as a radiation fin.

  The terminal box 9 is placed in the vicinity of both ends of the terminal box bottom surface portion 15 in contact with the respective top portions of the terminal box support portion 13, and the top portion and the terminal box bottom surface portion 15 are connected with screws or the like. These are fixed by a fixing member. As described above, it is preferable that the thickness of the plate-like member is ensured to have a sufficient width for fixing the terminal box. Further, since the plate-like member also has a function as a heat radiating fin, it is made as thin as possible within an allowable range of heat (heat dissipation). It is preferable that the same as the fin 4).

  Between the plate-like members of the terminal box support portion 13, a through hole 17 is provided for drawing out a lead wire 18 such as a stator to the outside of the housing 1. In the present embodiment, the through hole 17 has a substantially cylindrical configuration that penetrates a plate-like member 13c described later from the inside of the housing 1 toward the outside. The lead wire 18 is converged by a guide tube portion made of a soft resin or rubber, and is guided from the inside of the housing 1 toward the lead-in hole 12 provided in the terminal box bottom surface portion 15 through the through hole 17. It is like that.

  As shown in FIG. 2B, the plate-like member 13c extends between the end portions of the housing 1 in the same manner as 13a and 13b. The top of the plate-like member 13c also faces the terminal box bottom surface portion 15. To be arranged. A through hole 17 for drawing out the lead wire 18 is disposed (formed) at an arbitrary position of the plate-like member 13c. In the plate-like member 13c, the portion where the through hole 17 is disposed has a wide side surface width according to the diameter of the through hole 17, and the side surface in the rotation axis rotation direction of the portion where the through hole 17 is provided is the through hole. It has a streamlined shape extending from the non-output shaft direction to the output shaft direction with 17 as the center. The reason for the streamline shape is to prevent the turbulent flow of the cooling air A flowing through the flow path 14 in the portion widened by the through hole 17. For example, when the lead wire 18 and the guide tube portion 10 have a large diameter and the through hole 17 must be enlarged due to the request, the through hole 17 is particularly effective when there is a possibility that the through hole 17 may be an obstacle to cooling air. Become.

  Further, the plate-like member 13c has a streamline shape extending from the counter-output shaft direction to the output shaft direction with the through hole 17 as the center, and further, both end portions in the axial direction are extended in the same manner as the heat radiation fins 4 as heat radiation fins. It also has the function of.

  As described above, according to the present embodiment, the terminal box 9 is placed on the terminal box support portion 13 provided in the housing 1, thereby providing the flow path 14, through which the cooling air A flows. This improves the cooling performance. Further, since the cooling air A can be prevented from diffusing in the outer peripheral direction of the electric motor by the terminal box bottom surface portion 15 of the terminal box 9, a higher cooling and rectifying effect can be obtained as compared with the conventional electric motor. Further, according to this embodiment, since the terminal box 9 does not interfere with the cooling air A, the shape of the terminal box 9 can be freely determined.

  In addition, since the plate-like member 13c including the through hole 17 through which the lead wire 18 and the guide cylinder portion 10 pass has a streamline shape, the occurrence of turbulent flow of the cooling air A flowing through the flow path 14 is prevented. Can do. Moreover, the plate-like member 13c is extended in the axial direction at both ends in the same manner as the heat radiation fins 4, and also has a function as a heat radiation fin, so that the cooling air rectifying effect and the motor cooling performance can be improved.

  In addition, the streamline shape of the plate-like member 13c is not necessarily streamlined on the outlet side only on the cooling air inlet side. That is, the rotation shaft rotation direction side surface of the portion where the through hole 17 is provided has a streamline shape only from the counter-output shaft side toward the side surface of the portion where the rotation direction diameter of the through hole 17 is maximum, and thereafter It has a side surface shape that extends in the output axis direction with the same width (the streamline shape is only the lower half of the line BB ′ in FIG. 2B, and the same width thereafter). According to this configuration, it is possible to improve the rectifying effect of the cooling air and ensure the strength. Further, the configuration may be such that the side surfaces of the through-hole 17 where the diameter in the rotational direction is maximum are thicker than the width of the cooling air inlet side and thinner than the width of the side surface portion where the diameter is maximum.

  Moreover, it may replace with the plate-shaped member 13c and the structure which provides the hollow pipe which has a separate streamline shape may be sufficient. That is, a configuration in which one end portion of the hollow pipe is welded, screwed, or fitted to the housing 1 and the other end portion is screwed, abutted, or fitted to the bottom surface portion 15 of the terminal box 9 may be employed. Alternatively, various configurations such as a configuration in which the terminal box 9 is integrated with at least the bottom surface portion 15 and fitted or screwed into the through hole 17 can be applied. In addition, as a hollow pipe, various materials, such as a metal, resin, rubber | gum, can be applied as needed.

  Further, the both ends of the plate member 13c in the rotation axis direction are not extended to both ends of the housing 1, but are configured shorter than the plate members 13a and 13b, and only the portion where the through hole 17 is disposed extends in the rotation axis direction. You may comprise as a streamline shape. Alternatively, the side surface extending in the rotation axis direction may be configured as a streamlined guide tube portion 10.

  Moreover, it is also possible to utilize the guide cylinder part 10 and both extending parts of the present embodiment for supporting the terminal box in the same manner as the terminal box support parts 13a and 13b.

  As described above, in this embodiment, a space in which the cooling air efficiently flows is provided between the motor surface and the terminal box. Thereby, the electric motor which the cooling effect improves without the cooling wind which flows along the electric motor surface interfering with a terminal box can be provided.

  In the present embodiment, each of the two plate-like members 13 a and 13 b constituting the terminal box support portion 13 includes a through hole 17 for drawing out the lead wire 18, and a terminal is provided at the top of each plate-like member 13. One of the features is that the bottom of the terminal box 9 is provided with a hole that matches the position of the through hole 17 when the box 9 is placed. By dispersing the conducting lead wires 18, the diameters of the respective through holes 17 can be reduced, and thereby the width of the vicinity of the through holes 17 of the respective plate-like members constituting the terminal box support portion 13 is reduced. And the rectifying effect of the cooling air can be maintained.

  In FIG. 3, the fragmentary sectional view and partial top view of the electric motor in a present Example are shown. 3A is a partial cross-sectional view taken along the line BB ′ of FIG. 1 when the electric motor is observed from the side opposite to the output shaft, and FIG. 3B is an electric motor shown in FIG. It is a partial top view in the vicinity of -B ′.

  As shown in FIG. 3B, each of the two plate-like members 13a and 13b constituting the terminal box support portion 13 includes a through hole 17 corresponding to the lead-in hole 12 provided in the terminal box bottom surface portion 15, The terminal box bottom surface 15 and the top of the head are fixed by a fixing member such as a screw. And the partial side surfaces of each of the plate-like members 13 a and 13 b are widened according to the diameter of the through hole 17. Further, the side surface of the plate-like member provided with the through hole 17 has a streamline shape extending from the counter output shaft direction to the output shaft direction with the through hole 17 as a center. The whole including the fixing screw portion of the bottom surface of the terminal box may be streamlined. Further, only the inlet side of the cooling air may be streamlined, and the outlet side is not necessarily streamlined. That is, it is set as the structure which has the streamline shape from the non-output-shaft side to the through-hole 17 part in the rotating shaft rotation direction side surface of the part in which the through-hole 17 was provided.

  Each of the through holes 17 is provided at a position parallel to the rotation axis direction and the horizontal direction. In addition, the position of each through-hole 17 is not restricted to this, One side may be located near the output shaft side, and the other may be located on the non-output shaft side.

  Thus, according to the present embodiment, by providing a plurality of through holes 17, each diameter can be reduced, the side width of each plate-like member of the terminal box support portion 13 can be reduced accordingly, and the cooling air can be reduced. Can be further maintained, and the cooling efficiency of the motor can be improved.

  In the present embodiment, the area of the terminal box bottom surface portion 15 placed on the terminal box support portion 13 is larger than the area of the terminal box lid portion 11, and the terminal box bottom surface portion 15 covers the housing 1 in a wide range. Is one of the features.

  In FIG. 4, the fragmentary sectional view and partial top view of the electric motor in a present Example are shown. 4A is a partial cross-sectional view taken along the line BB ′ of FIG. 1 when the electric motor is observed from the side opposite to the output shaft, and FIG. 4B is an electric motor shown in FIG. It is a partial top view in the vicinity of -B ′.

  As shown in FIG. 4A, the terminal box bottom surface portion 15 is configured to have a larger area than the terminal box lid portion 11 and covers the housing 1. In addition, when the radiation fin arrange | positioned in parallel with the terminal box support part 13 exists, you may cover including this. The terminal box bottom surface portion 15 is configured as a separate member from the terminal box side surface portion, and is joined by welding, screwing, fitting, or the like, for example. For this reason, the terminal box side surface portion can be disposed at any position within the range of the terminal box bottom surface portion 15.

  As in the first embodiment, the plate-like members 13 a and 13 b that are the terminal box support portions 13 and the through holes 17 that are arranged between the plate-like members 13 a and 13 b and that are used to pull out the lead wires 18 such as a stator to the outside of the housing 1. A plate-like member 13c including a guide tube portion 10 extending toward the lead-in hole 12 provided in the terminal box bottom surface portion 15 is provided at a corresponding position, and a lead wire passes through the inside of the guide tube portion 10 to the terminal box. 9 is guided inside. In the plate-like member 13 c, the portion where the through hole 17 is disposed has a wide side surface according to the diameter of the through hole 17, and the side surface shape further extends from the counter output shaft direction around the through hole 17 to the output shaft. It has a streamlined shape extending in the direction. Note that only the inlet side of the cooling air is streamlined and the outlet side is not necessarily streamlined. That is, it is good also as a structure which has the streamline shape from the non-output-shaft side to the through-hole 17 part in the rotating shaft rotation direction side surface of the part in which the through-hole 17 was provided.

  Therefore, by providing the through hole 17 and the lead-in hole 12 in the terminal box bottom surface part 15 in accordance with the arrangement position of the terminal box side surface part, the connection between the terminal box interior and the motor interior can be configured as in the first embodiment, and the motor The cooling air A flowing on the surface can be distributed efficiently.

  As described above, according to the present embodiment, the terminal box bottom portion 15 prevents the cooling air from diffusing in the outer peripheral direction of the electric motor in a wide range, so that not only can a higher cooling effect be obtained, but also the terminal box position can be set to the terminal box bottom. It can be arranged freely within the range of the surface portion 15. In addition, temperature unevenness can be improved.

In addition, although the present Example demonstrated using the structure of Example 1, it is good also as a structure provided with the through-hole 17 for drawing out the lead wire 18 in the terminal box support part 13 by Example 2. FIG.
The present invention is not limited to the above-described embodiments, and includes various modifications. 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. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

For example, in the present embodiment, the electric motor having a plurality of heat radiation fins 4 on the outer periphery of the housing 1 is taken as an example. However, in a small motor having a relatively small rated value, the cooling of the external fan fan without such heat radiation fins 4 is provided. It is also possible to apply the configuration of the present embodiment to a type in which the jacket is cooled by wind. This is because even with this type, the terminal box hinders cooling air flow. In this case, the plate-like members 13a, 13b, 13c and the like may be configured to have a length shorter than that and a streamlined side surface without extending from the opposite output shaft side of the housing 1 to the output shaft side.
Further, in the present embodiment, an example in which a plurality of plate-like members are provided above and in a part of the housing 1 has been described. That is, when the electric motor is mounted on a specific device, the direction in which the electric motor is installed may vary vertically and horizontally. At this time, the position of the terminal box often becomes a problem due to other parts of the device and other factors. Therefore, by arranging the plate-like members 13a, 13b and 13c as the heat radiating fins and the supporting members in advance on the upper side surface and the left and right side surfaces of the housing 1, the location of the terminal box can be easily selected. It can greatly contribute to productivity.

  Further, in the present embodiment, the radial gap type electric motor has been described as an example, but the present invention can also be applied to an electric motor that uses outer housing cooling such as an axial gap type electric motor. It can also be applied to a generator.

1: Housing, 2: Bracket, 3: Bracket, 4: Radiation fin, 5: Outer fan,
6: fan cover, 7: rotating shaft, 9: terminal box, 10: guide tube, 11: terminal box cover, 12: lead-in hole, 13: terminal box support, 13a: plate member, 13b: plate Member, 13c: plate-like member, 14: flow path, 15: bottom surface of terminal box, 17: through hole, 18: lead wire

Claims (8)

A tubular housing;
A bracket on the output shaft side and the opposite output shaft side that rotatably supports the rotation shaft and is joined to both ends of the housing;
An outer fan fan provided on the end side of the rotary shaft that passes through the bracket on the side opposite to the output shaft , and rotates together with the rotary shaft ;
A fan cover to the cooling air generated by the rotation of the outside fan fan is deflected toward the output shaft side from the counter-output shaft side,
At least two plate-like members having a predetermined height from the outer periphery of the housing toward the outer side in the radial direction and arranged from the counter-output shaft side to the output shaft side with a predetermined interval in the rotation direction of the rotary shaft And
The plate-like member functions as a support member that supports the terminal box by placing and fixing the terminal box on the top of the head , and the plate-like member has an armature lead wire outside the housing. At least one through hole extending from the housing through hole for pulling out toward the lead hole provided in the terminal box is provided , and the side surface of the plate-like member in which the through hole is provided in the rotational axis rotation direction side However, the rotating electrical machine has a streamlined shape extending from the non-output shaft side toward the output shaft side with the through hole as a center. The rotating electrical machine according to claim 1,
The terminal box is fixed in contact with the bottom of the terminal box at the top of the support member,
Rotating electric machine area of the terminal box bottom portion, and wherein the wider than the area of the terminal box lid, those and having a shape which extends the in schematic parallel to the shape of the housing periphery. The rotating electrical machine according to claim 2,
The housing has a plurality of heat radiation fins arranged in parallel to the support member,
The rotating electric machine according to claim 1, wherein the bottom surface of the terminal box has a shape covering a part of at least one top of the plurality of heat dissipating fins . The rotating electrical machine according to claim 2 ,
The terminal box has a bottom part and a side part as separate members, and the side part is fixed to the bottom part at a free position within the range of the bottom part. Rotating electric machine. The rotating electrical machine according to claim 1 ,
Both ends of the plate member in the rotation axis direction extend from the vicinity of one end of the housing in the rotation axis direction to the vicinity of the other end . The rotating electrical machine according to claim 1 ,
A rotating electrical machine characterized in that a side surface of the plate-like member in which a through hole is provided has a streamlined shape in a rotating shaft rotation direction side surface from the opposite output shaft side toward the through hole portion . The rotating electrical machine according to claim 1 ,
A streamlined shape in which the side of the rotating shaft rotating direction of the portion for fixing the terminal box of the plate-like member and the portion provided with the through hole extends from the non-output shaft side to the output shaft side with the through hole as the center rotating electric machine characterized in that it comprises a. The rotating electrical machine according to any one of claims 1 to 7 ,
At least one of the plate-like members is a heat radiating fin .

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