rotating electrical machines

Abstract

To provide a rotary electric machine having a cooling fin that is capable of easily avoiding possible interference of a part of the fin with outside depending on the location of installation while sufficiently securing cooling performance.SOLUTION: A rotary electric machine according to an embodiment comprises: a stator iron core structured by stacking a magnetic steel sheet; and a plurality of cooling fin members provided on an outer peripheral surface part of the stator iron core while extending in an axial direction. Each of the cooling fin members is constructed of a plate material having a spring property that is doubly folded so as to have a form that enables cooling air to flow inside and so as to extend in the axial direction to an outer circumferential side to have a folded portion and, with an attachment flange integrally provided on opposite sides of an edge part located in the inner circumferential side. On the outer peripheral surface of the stator iron core, the cooling fin member is detachably attached so as to be in surface contact with the stator core.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a rotating electric machine having a cooling fin member. [Background technology]

[0002] For example, some rotating electrical machines, such as motors, for various industrial equipment are configured with a cooling fan attached to the rear end of the rotating shaft (see, for example, Patent Document 1). This motor is configured by attaching motor brackets to both the front and rear ends of a cylindrical frame with bolts, and attaching, for example, a propeller-type fan to the rear end of the rotating shaft that protrudes rearward from the motor bracket. A plurality of cooling fins, aligned circumferentially and extending axially, are integrally provided on the outer periphery of the frame, and cooling air flows along these fins. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-146346 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a motor having cooling fins on the periphery as described above, depending on the user's installation location, the height of some of the cooling fins protruding in the circumferential direction may interfere with other machinery, etc. Conventionally, in such cases, a solution has been to remove part of the cooling fin by cutting it off, but this requires the tedious work of cutting off part of the cooling fin and also raises concerns that the cooling performance of the motor may be reduced. To provide a rotating electric machine equipped with cooling fins that can easily prevent a part of the fins from interfering with the outside depending on the installation location while ensuring sufficient cooling performance. [Means for solving the problem]

[0005] The first embodiment of the rotating electric machine includes a stator core formed by laminating electromagnetic steel sheets, and a coil spring provided on the outer peripheral surface of the stator core and extending in the axial direction. Ru cold a cooling fin member; The cooling fin member includes a plurality of divided fins divided in the axial direction, the cooling fin member Multiple split fins is formed by folding a springy plate material in half so that cooling air can flow inside and the folded portion extends in the axial direction on the outer periphery, and is provided with mounting flanges integrally on both sides of the edge portion located on the inner periphery, and on the outer periphery surface of the stator core, The plurality of segmented fins are so as to come into surface contact with the stator core Inserted from one end side and the other end side of the axial direction It can be attached detachably.

[0006] The second embodiment of the rotating electric machine comprises a cylindrical frame, a stator core provided on the inner periphery of the frame, a motor bracket provided at the axial end of the frame and supporting a rotating shaft, and a plurality of cooling fin members provided on the outer periphery of the frame and extending in the axial direction, the cooling fin members being formed by folding a springy plate material in half so that cooling air can flow inside and that the fin members extend axially on the outer periphery with a folded portion, and are formed with mounting flanges integrally formed on both sides of the edge portion located on the inner periphery, and are removably attached to the outer periphery of the frame so as to be in face contact with the frame. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a vertical cross-sectional side view showing a schematic overall configuration of a motor according to a first embodiment. [Figure 2] Longitudinal side view of the stator [Figure 3] Vertical cross-sectional front view of the outer periphery of the stator [Figure 4] A perspective view of a cooling fin member [Figure 5] FIG. 1 is a diagram showing a front view and a side view of a cooling fin member side by side; [Figure 6]FIG. 10 is a longitudinal sectional side view showing the main configuration of a motor according to a second embodiment. [Figure 7] FIG. 10 is a vertical cross-sectional side view showing the state of attachment of the cooling fin member according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment in which the present invention is applied to a motor as a rotating electric machine for various industrial equipment will be described with reference to the drawings. Parts common to multiple embodiments will be assigned the same reference numerals, and detailed explanations and additional illustrations will be omitted. In the drawings, the axial direction of the motor, i.e., the direction in which the center line of the rotating shaft extends, is shown as the left-right direction. In Figure 1 and other figures, the left side is the front side, which is the load side, and the right side is the rear side, which is the anti-load side.

[0009] (1) First embodiment A first embodiment will be described with reference to Figures 1 to 5. In this embodiment, the motor is applied to an SPM motor used as a drive source for an elevator hoist, for example, and is configured as a so-called frameless motor 1. Figure 1 shows a schematic diagram of the overall configuration of the motor 1 according to this embodiment. Here, the motor 1 is configured with motor brackets 3 and 4 at both axial ends of a stator 2 that is cylindrical overall. A rotor 5 is disposed on the inner periphery of the stator 2.

[0010] The rotor 5 is configured with a plurality of permanent magnets 7 on the outer periphery of the rotor core 6, and a rotating shaft 8 is fixed so as to pass through the center of the rotor core 6. Bearings 9 and 10 are attached to the motor brackets 3 and 4, respectively. The rotating shaft 8 is rotatably supported by these bearings 9 and 10. Although not shown, a pulley called a sheave is attached to the tip end (left side in the figure) of the rotating shaft 8. A cooling fan 11 is attached to the rear end of the rotating shaft 8. This fan 11 is configured to blow cooling air forward (left side in the figure) as it rotates. A fan cover 16 that covers the fan 11 is attached to the motor bracket 4.

[0011] The stator 2 will now be described with reference to Figures 2 to 5. The stator 2 is configured by mounting windings 13 on a stator core 12. As is well known, the stator core 12 is configured, for example, by punching out an electromagnetic steel sheet 12a into a predetermined shape, i.e., into a substantially ring-shaped plate having slots opening to the inner periphery, and then stacking a number of the punched electromagnetic steel sheets 12a in the axial direction. A plurality of axially extending cooling fin members 14 for heat dissipation are provided on the outer circumferential surface of the stator core 12, lined up in the circumferential direction.

[0012] The cooling fin member 14 is made of a metal plate, such as a thin aluminum plate, that has good thermal conductivity and spring properties. As shown in FIGS. 4 and 5, the cooling fin member 14 integrally comprises a heat dissipation section 14a, a mounting flange 14b, and a binding section 14c. Specifically, the heat dissipation section 14a is formed by folding the plate in half, i.e., in the axial direction, so that the folded portion extends axially toward the outer periphery, i.e., the upper side in FIG. 4, and thus has a rectangular shape that is long in the axial direction when viewed from the side. The axial length of the heat dissipation section 14a is equal to the axial length of the stator core 12. The cooling air from the fan 11 also flows through the inside of the U-shaped folded portion of the heat dissipation section 14a.

[0013] The mounting flange 14b is integrally formed so as to extend to both sides (left and right in FIG. 5) from the entire edge (lower end in FIG. 4, etc.) on the base end side opposite the folded-back side of the heat dissipation portion 14a. The binding portions 14c are integrally formed so as to extend and protrude in the axial direction from the front and rear ends of the mounting flange 14b, and are provided in a total of four locations. As will be described later, the binding portions 14c are located at both axial ends of the stator core 12 and are configured to be bent inward so as to engage with the ends of the stator core 12 and bind the electromagnetic steel sheets 12a together.

[0014] In contrast to the cooling fin member 14 having the above configuration, in this embodiment, the outer periphery of the stator core 12 is provided with a plurality of grooves 15, into which the mounting flanges 14b can be axially inserted, extending circumferentially and extending over the entire axial direction of the stator core 12. As shown in FIG. 3 , each groove 15 forms a recess that opens on the outer periphery of the stator core 12, and is formed so that a cavity extends from the bottom of the recess to both sides in the circumferential direction, i.e., has a convex shape when viewed in the axial direction. The grooves 15 open on both end faces of the stator core 12. The grooves 15 are formed into a corresponding shape during the punching process of the electromagnetic steel sheets 12a that constitute the stator core 12, and a large number of electromagnetic steel sheets 12a are stacked together to form the axially continuous grooves 15.

[0015] The cooling fin member 14 configured as described above is detachably attached to the groove 15 of the stator core 12 by being inserted axially so that the base end of the heat dissipation portion 14a is positioned in the recess of the groove 15 and both mounting flanges 14b are positioned in the respective expansion portions. Since the cooling fin member 14 is made of a leaf spring material, its spring property is utilized to obtain a holding force within the groove 15, and the mounting flanges 14b are brought into close contact with the inner wall of the groove 15 to obtain a surface contact force. The cooling fin member 14 may be attached to all of the grooves 15, or it may be selectively attached to only the necessary positions among the multiple grooves 15. After inserting the cooling fin member 14 into the groove 15, the binding portion 14c is bent inward to engage with the end of the stator core 12, thereby obtaining a binding force between the electromagnetic steel sheets 12a.

[0016] The stator 2 of the motor 1 of this embodiment provides the following functions and advantages. Specifically, in this embodiment, the multiple cooling fin members 14 provided on the outer peripheral surface of the stator core 12 are separate from the stator core 12 and are detachably attached to the stator core 12. Therefore, the cooling fin members 14 can be removed or not attached to positions on the outer peripheral surface of the stator core 12 where they may interfere with the outside, and can be provided only in positions where they will not interfere with the outside. In this case, the mounting flange 14b of the cooling fin members 14 is in surface contact with the stator core 12, and the heat dissipation portion 14a of the cooling fin member 14 is folded in half. This allows a single cooling fin member 14 to provide a wide heat dissipation area without increasing the size of the stator core 12 in the outer peripheral direction, and cooling air flows inside the heat dissipation portion 14a.

[0017] This makes it possible to improve the cooling performance of a single cooling fin member 14, or in other words, to obtain the required overall cooling performance even if the number of attached members is reduced. Also, by utilizing the spring properties of the cooling fin members 14, it is possible to attach them to the stator core 12 or to bring them into close contact with the stator core 12. As a result, according to this embodiment, it is possible to obtain the excellent effect that, in a device equipped with cooling fins 14, sufficient cooling performance is ensured while easily preventing portions of the fins 14 from interfering with the outside depending on the installation location.

[0018] In particular, in this embodiment, the outer periphery of the stator core 12 is provided with a plurality of grooves 15 into which the mounting flanges 14b of the cooling fin member 14 can be inserted in the axial direction. This makes it possible to easily mount the cooling fin member 14 in a predetermined position by axially inserting the mounting flanges 14b into the grooves 15. At this time, the springiness of the cooling fin member 14 is used to obtain a holding force within the grooves 15, and it is also possible to obtain a surface contact force by bringing the mounting flanges 14b into close contact with the inner surface of the grooves 15. This also makes it easy to remove the cooling fin member 14 from the grooves 15 of the stator core 12.

[0019] Furthermore, in this embodiment, cooling fin member 14 is integrally provided with binding portions 14c that are located at the axial end of stator core 12 and are bent to engage with the end of stator core 12 and bind together electromagnetic steel sheets 12a. As a result, the electromagnetic steel sheets 12a of stator core 12 are bound together by binding portions 14c, making it possible to omit the structure for binding electromagnetic steel sheets 12a accordingly. Therefore, cooling fin member 14 now has the added function of binding electromagnetic steel sheets 12a in addition to cooling, further enhancing its practical functionality.

[0020] (2) Second embodiment 6 shows the main configuration of a motor 21 as a rotating electric machine in the second embodiment, and the differences from the first embodiment will be described below. That is, the motor 21 has a stator 23 provided on the inner periphery of a metal frame 22 that is, for example, cylindrical overall, and a rotor provided on the inner periphery of the stator 23. The stator 23 is configured by mounting a winding 25 on a stator core 24 formed by laminating electromagnetic steel sheets.

[0021] Motor brackets 26, 27 are attached to both axial ends of the frame 22. Bearings are provided in the motor brackets 26, 27 to support a rotating shaft fixed to the rotor. The rotor, rotating shaft, bearings, fan, fan cover, etc. are not shown in Figure 6. A plurality of axially extending cooling fin members 28 for dissipating heat are provided on the outer circumferential surface of the frame 22, lined up in the circumferential direction.

[0022] The cooling fin member 28 is made of a metal plate having good thermal conductivity and spring properties, such as a thin aluminum plate, and although not shown in detail, it integrally includes a heat dissipation portion 28a, a mounting flange 28b, and a binding portion 28c. In this case, the cooling fin member 28 has the same configuration as the cooling fin member 14 in the first embodiment, and detailed description thereof will be omitted. However, the binding portion 28c is located at the axial end of the frame 22 and is bent to engage with the outer peripheral edge of the outer surface of the motor brackets 26, 27, thereby binding the frame 22.

[0023] Furthermore, in this embodiment, with respect to the cooling fin member 28 having the above-described configuration, a plurality of grooves 29, into which the mounting flanges 28b can be axially inserted, are provided on the outer periphery of the frame 22. The grooves 29 extend in the entire axial direction of the frame 22 and are aligned in the circumferential direction. Although not shown in detail, the grooves 29 also have the same shape as the grooves 15 in the first embodiment. The cooling fin member 28 is detachably attached to the outer periphery of the frame 22 by being inserted into the grooves 29 of the frame 22 in the axial direction. After the cooling fin member 28 is inserted into the grooves 29, the binding portions 28c can be bent inward to engage with the ends of the motor brackets 26, 27, thereby obtaining binding force to the frame 22.

[0024] According to the second embodiment having the above configuration, the multiple cooling fin members 28 provided on the outer peripheral surface of the frame 22 are separate from the frame 22 and are detachably attached to the frame 22. Therefore, the cooling fin members 28 can be omitted or removed from positions on the outer peripheral surface of the frame 22 that may interfere with the outside, and the cooling fin members 28 can be provided only in positions that do not interfere with the outside. In this case, the attachment flange 28b of the cooling fin members 28 is in surface contact with the frame 22, and the heat dissipation portion 28a of the cooling fin members 28 is folded in half, so that a wide heat dissipation area can be obtained with one cooling fin member 28 without increasing the size in the outer peripheral direction, and cooling air can circulate inside the heat dissipation portion 28a.

[0025] This makes it possible to improve the cooling performance of a single cooling fin member 28, or in other words, to obtain the required overall cooling performance even if the number of attached fins is reduced. Also, the springiness of the cooling fin members 28 can be utilized to attach them to the frame 22 or to make them adhere closely to the frame. As a result, according to this embodiment, an apparatus equipped with cooling fins 28 can obtain the excellent effect of easily preventing portions of the fins 28 from interfering with the outside depending on the installation location while still ensuring sufficient cooling performance.

[0026] In particular, in this embodiment, a plurality of grooves 29 into which the mounting flanges 28b of the cooling fin member 28 can be inserted in the axial direction are provided on the outer periphery of the frame 22. This allows the cooling fin member 28 to be easily mounted in a predetermined position by axially inserting the mounting flanges 28b into the grooves 29. At this time, the springiness of the cooling fin member 28 is utilized to obtain a holding force within the grooves 29, and the mounting flanges 28b can be brought into close contact with the inner surfaces of the grooves 29 to obtain a surface contact force. This also makes it easy to remove the cooling fin member 28 from the grooves 29 of the frame 22.

[0027] Furthermore, in this embodiment, cooling fin member 28 is integrally provided with binding portions 28c that are located at the axial end of frame 22 and are bent to engage with the ends of motor brackets 26, 27 to bind to frame 22. As a result, frame 22 and motor brackets 26, 27 are bound by binding portions 28c, which makes it possible to correspondingly omit the structure for attaching motor brackets 26, 27. Therefore, cooling fin member 28 has the additional function of binding motor brackets 26, 27 in addition to cooling, further enhancing its practical functionality.

[0028] (3) Third embodiment and other embodiments 7 shows a third embodiment, which differs from the first embodiment in the configuration of cooling fin member 31. Cooling fin member 31 of this embodiment is composed of first and second split fins 32, 33, which are formed by dividing cooling fin member 14 of the first embodiment in half in the axial direction of stator core 12. These first and second split fins 32, 33 integrally have heat dissipation portions 32a, 33a and mounting flanges 32b, 33b, and one end of first split fin 32 is integrally formed with bundling portion 32c, and the other end of second split fin 33 is integrally formed with bundling portion 33c.

[0029] In this embodiment, the first divided fin 32 is inserted into the groove 15 of the stator core 12 from one end side (left side in the figure), and the second divided fin 33 is inserted into the groove 15 of the stator core 12 from the other end side (right side in the figure) and attached. According to this third embodiment, the same effects as those of the first embodiment can be obtained. At the same time, when assembling the cooling fin member 31, the insertion amount (length) of the first and second divided fins 32, 33 into the respective grooves 15 can be reduced. This allows for relatively small resistance when inserting the first and second divided fins 32, 33, improving the ease of insertion work.

[0030] In the above embodiments, the heat dissipation portions 14a, 28a of the cooling fin members 14, 28 are configured to have a U-shaped cross section, but they may also be configured to have a V-shaped cross section. Furthermore, the binding portions 14c, 28c of the cooling fin members 14, 28 do not necessarily have to be provided. The cooling fin members may be attached by bolting, welding, brazing, or other means without providing grooves in the stator core or frame. Furthermore, the present invention is not limited to elevator motors and can be applied to various types of rotating electric machines and for various uses.

[0031] Although several 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 embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0032] In the drawings, 1 and 21 indicate motors (rotating electric machines), 2 and 23 indicate stators, 3, 4, 26 and 27 indicate motor brackets, 5 indicates a rotor, 8 indicates a rotating shaft, 9 and 10 indicate bearings, 11 indicates a fan, 12 and 24 indicate a stator core, 12a indicates an electromagnetic steel plate, 13 indicates a winding, 14, 28 and 31 indicate cooling fin members, 14a, 28a, 32a and 33a indicate heat dissipation portions, 14b, 28b, 32b and 33b indicate mounting flanges, 14c, 28c, 32c and 33c indicate binding portions, 15 and 29 indicate groove portions, and 32 and 33 indicate divided fins.

Claims

1. a stator core formed by laminating electromagnetic steel sheets; a cooling fin member provided on an outer peripheral surface of the stator core so as to extend in the axial direction, The cooling fin member includes a plurality of divided fins divided in the axial direction, The plurality of divided fins of the cooling fin member are formed by folding a springy plate material in half so that cooling air can flow through the inside and the folded portion extends in the axial direction toward the outer periphery, and are integrally provided with mounting flanges on both sides of the edge portion located on the inner periphery, The plurality of split fins are detachably attached to the outer peripheral surface of the stator core by being inserted from one end side and the other end side in the axial direction so as to be in surface contact with the stator core.

2. 2. The rotating electric machine according to claim 1, wherein the stator core has an outer periphery provided with a plurality of grooves into which mounting flanges of the plurality of split fins of the cooling fin member can be axially inserted.

3. 3. A rotating electric machine according to claim 1, wherein the plurality of split fins of the cooling fin member are integrally provided with a binding portion located at the axial end of the stator core and which is bent to engage with the end of the stator core and bind the electromagnetic steel sheets together.

4. The motor comprises a cylindrical frame, a stator core provided on the inner periphery of the frame, a motor bracket provided on an axial end of the frame to support a rotating shaft, and a plurality of cooling fin members provided on the outer periphery of the frame to extend in the axial direction, The cooling fin member is formed by folding a springy plate material in half so that cooling air can flow through the inside and the folded portion extends in the axial direction toward the outer periphery, and is provided with mounting flanges integrally on both sides of the edge portion located on the inner periphery, A rotating electric machine that is detachably mounted on the outer peripheral surface of the frame so as to be in surface contact with the frame.

5. 5. The rotating electric machine according to claim 4, wherein the frame has a plurality of grooves formed on an outer periphery thereof, into which the mounting flanges of the cooling fin members can be axially inserted.

6. 6. A rotating electric machine according to claim 4 or 5, wherein the cooling fin member is integrally provided with a fastening portion located at the axial end of the frame and bent to engage with the motor bracket and fasten to the frame.

Images