JP2023100409A - Rotary electric machine - Google Patents

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

An embodiment of the present invention relates to a rotating electric machine having cooling fin members.

For example, as a rotary electric machine, such as a motor, for various types of industrial equipment, there is one that is configured by providing a cooling blower fan at the rear end of a rotating shaft (see, for example, Patent Document 1). This motor is constructed by attaching motor brackets to the front and rear end portions of a cylindrical frame by bolting, and attaching, for example, a propeller-type blower fan to the rear end portion of the rotating shaft projecting rearward from the motor bracket. . A plurality of cooling fins arranged in the circumferential direction and extending in the axial direction are integrally provided on the outer peripheral portion of the frame, and cooling air flows along the fins.

JP 2019-146346 A

By the way, in the motor having the cooling fins on the outer periphery as described above, depending on the user's installation location, the protrusion height of the cooling fins in the outer peripheral direction may interfere with other machines, etc. may become Conventionally, in such a case, a countermeasure such as removing a part of the cooling fins by shaving is taken. There is also a concern that the cooling performance of the
Therefore, a rotating electric machine that has cooling fins and that can easily avoid interference of a part of the fins with the outside depending on the installation location while ensuring sufficient cooling performance. offer.

A first rotating electric machine according to an embodiment includes a stator core configured by laminating electromagnetic steel sheets, and a plurality of cooling fin members provided extending in an axial direction on an outer peripheral surface of the stator core, The cooling fin member is formed by folding a plate material having springiness in two such that the inside of the plate material allows cooling air to flow, and the folded portion extends axially toward the outer peripheral side. In addition, mounting flanges are integrally provided on both sides of the edge located on the inner peripheral side, and are detachably mounted on the outer peripheral surface of the stator core so as to be in surface contact with the stator core. there is

A second rotating electric machine of an embodiment includes a cylindrical frame, a stator core provided on the inner peripheral portion of the frame, a motor bracket provided on an axial end of the frame and supporting a rotating shaft, A plurality of cooling fin members are provided extending in the axial direction on the outer peripheral surface of the frame, and the cooling fin members are made of a plate material having spring properties in such a manner that cooling air can flow through the inside thereof, and , it is folded in two so that the folded portion extends axially on the outer peripheral side, and mounting flanges are integrally provided on both sides of the edge portion located on the inner peripheral side, It is detachably attached to the outer peripheral surface of the frame so as to be in surface contact with the frame.

1 shows a first embodiment, and is a longitudinal side view schematically showing the overall configuration of a motor; FIG. Vertical side view of stator Vertical front view of outer periphery of stator Perspective view of cooling fin member The figure which shows the front view and side view of a cooling fin member side by side. FIG. 2 shows a second embodiment, and is a vertical cross-sectional view showing the essential configuration of the motor. A longitudinal side view showing a third embodiment, showing how cooling fin members are attached.

Hereinafter, an embodiment applied to a motor as a rotary electric machine for various industrial equipment will be described with reference to the drawings. Parts common to a plurality of embodiments are denoted by the same reference numerals, and detailed descriptions and new illustrations are omitted. In the drawings, the axial direction of the motor, that is, the direction in which the center line of the rotating shaft extends is shown as the left-right direction. In FIG. .

(1) First Embodiment A first embodiment will be described with reference to FIGS. 1 to 5. FIG. This embodiment is applied to an SPM type motor used as a drive source for an elevator hoist, for example, and is configured as a so-called frameless motor 1 . FIG. 1 schematically shows the overall configuration of a motor 1 according to this embodiment. Here, the motor 1 comprises a stator 2 having a cylindrical shape as a whole and motor brackets 3 and 4 at both ends in the axial direction. A rotor 5 is arranged inside the stator 2 .

The rotor 5 includes 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 of the rotating shaft 8 (left side in the figure). A cooling fan 11 is attached to the rear end of the rotating shaft 8 . The fan 11 is configured to blow cooling air forward (to the left in the figure) by rotation. A fan cover 16 that covers the fan 11 is provided on the motor bracket 4 .

Now, the stator 2 will be described with reference to FIGS. 2 to 5 as well. The stator 2 is constructed by mounting windings 13 on a stator core 12 . At this time, as is well known, the stator core 12 is formed by punching, for example, an electromagnetic steel sheet 12a into a predetermined shape, that is, a substantially ring-shaped plate having a slot opening on the inner peripheral side. It is constructed by laminating a large number of sheets in the axial direction. On the outer peripheral surface of the stator core 12, a plurality of cooling fin members 14 for heat radiation extending in the axial direction are arranged in the circumferential direction.

The cooling fin member 14 is made of a metal plate material having good thermal conductivity and spring properties, such as a thin aluminum plate material. As shown in FIGS. 14b and a binding portion 14c are integrally provided. Specifically, the heat radiating portion 14a is arranged such that the plate material extends axially upward in FIG. It is formed in a rectangular shape that is long in the axial direction when viewed from the side. The axial length of the heat radiating portion 14 a is equal to the axial length of the stator core 12 . In the heat radiating portion 14a, the cooling air from the fan 11 also flows through the inner portion of the U-shaped bent portion.

The mounting flange 14b is integrated so as to extend both sides (left and right in FIG. 5) from the entire base end edge (lower end in FIG. 4) opposite to the folded side of the heat radiating portion 14a. is provided in The binding portions 14c are integrally provided so as to protrude axially from the front and rear ends of the mounting flange 14b, and are provided at four locations in total. As will be described later, the binding portions 14c are positioned at both ends of the stator core 12 in the axial direction, and are bent toward the inner peripheral side to engage with the ends of the stator core 12 and hold the electromagnetic wave. It is configured to bind the steel plates 12a together.

In contrast to the cooling fin member 14 having the above configuration, in the present embodiment, the outer peripheral portion of the stator core 12 is provided with a groove portion 15 into which the mounting flange 14b can be inserted in the axial direction. A plurality of them are provided side by side in the circumferential direction extending over the entirety. As shown in FIG. 3, each of the grooves 15 forms a recess that is open on the outer peripheral surface of the stator core 12, and has a shape that expands the cavity from the bottom of the recess to both sides in the circumferential direction. It is formed in a convex shape when viewed in the direction. The grooves 15 are open on both end surfaces of the stator core 12 . The shape of the groove portion 15 is punched into a corresponding shape at the stage of punching the electromagnetic steel plates 12a constituting the stator core 12, and by laminating a large number of electromagnetic steel plates 12a, the groove portions 15 are continuous in the axial direction. It is said that

The cooling fin member 14 configured as described above is arranged such that the base end portion of the heat radiating portion 14a is positioned in the concave portion of the groove portion 15 of the stator core 12, and both the mounting flanges 14b are positioned in the widening portions. , is detachably attached by being inserted from the axial direction. At this time, since the cooling fin member 14 is made of a plate spring material, the springiness of the cooling fin member 14 is used to obtain a holding force in the groove portion 15, and the mounting flange 14b is brought into close contact with the inner wall of the groove portion 15. Surface contact force can be obtained. Moreover, although the cooling fin members 14 may be attached to all the grooves 15, they can be selectively attached only to necessary positions among the plurality of grooves 15. FIG. Then, as shown in FIG. 2, after inserting the cooling fin member 14 into the groove 15, the binding portion 14c is bent inwardly to engage with the end portion of the stator core 12 and the electromagnetic steel plate 12a. You can get a bond between them.

According to the stator 2 of the motor 1 of this embodiment, the following actions and effects can be obtained. That is, in this embodiment, the plurality of 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 member 14 can be dispensed with or removed from the position where there is a risk of interfering with the outside of the outer peripheral surface of the stator core 12, and the cooling fin member 14 can be removed only at the position where there is no interference with the outside. A member 14 may be provided. At this time, the mounting flange 14b of the cooling fin member 14 is in surface contact with the stator core 12, and since the heat radiating portion 14a of the cooling fin member 14 is a double-fold type, one A large heat radiation area can be obtained with the individual cooling fin members 14, and the cooling air flows inside the heat radiation portion 14a.

As a result, the cooling performance of a single cooling fin member 14 can be enhanced. In other words, even if the number of attached cooling fin members 14 is partially reduced, the necessary cooling performance can be obtained as a whole. In addition, by utilizing the springiness of the cooling fin members 14, it is possible to attach them to the stator core 12 and bring them into close contact with each other. As a result, according to the present embodiment, although the cooling fins 14 are provided, the fins 14 may partially interfere with the outside depending on the installation location, while ensuring sufficient cooling performance. It is possible to obtain an excellent effect that it can be easily avoided.

In particular, in this embodiment, the outer peripheral portion of the stator core 12 is provided with a plurality of grooves 15 into which the mounting flanges 14b of the cooling fin members 14 can be axially inserted. Accordingly, by axially inserting the mounting flange 14b into the groove 15, the cooling fin member 14 can be easily mounted at a predetermined position. At this time, the springiness of the cooling fin member 14 can be used to obtain holding force in the groove 15, and the mounting flange 14b can be brought into close contact with the inner surface of the groove 15 to obtain surface contact force. Removal of the cooling fin members 14 from the grooves 15 of the stator core 12 is also facilitated.

Furthermore, in the present embodiment, the cooling fin members 14 are positioned at the axial ends of the stator core 12 and are bent to engage the ends of the stator core 12 so that the electromagnetic steel plates 12a are held together. A binding portion 14c for binding is integrally provided. As a result, the magnetic steel plates 12a of the stator core 12 are bound together by the binding portion 14c, so that the configuration for binding the magnetic steel plates 12a can be omitted. Therefore, the cooling fin member 14 is added with a function of bundling the electromagnetic steel sheets 12a in addition to cooling, and the practical function can be further enhanced.

(2) Second Embodiment FIG. 6 shows a main configuration of a motor 21 as a rotating electrical machine in a second embodiment, and differences from the first embodiment will be described. That is, the motor 21 has, for example, a stator 23 provided on the inner peripheral portion of a metal frame 22 having a cylindrical shape as a whole, and a rotor provided on the inner peripheral side of the stator 23 . The stator 23 is constructed by attaching windings 25 to a stator core 24 constructed by laminating electromagnetic steel sheets.

Motor brackets 26 and 27 are attached to both ends of the frame 22 in the axial direction. The motor brackets 26 and 27 are provided with bearings that support a rotating shaft fixed to the rotor. In FIG. 6, illustration of a rotor, a rotating shaft, a bearing, a fan, a fan cover, etc. is omitted. A plurality of cooling fin members 28 for heat radiation extending in the axial direction are arranged in the circumferential direction on the outer peripheral surface of the frame 22 .

The cooling fin member 28 is made of a metal plate material having good thermal conductivity and spring properties, such as a thin aluminum plate material. It integrally has a 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 positioned at the axial end of the frame 22, and is provided so as to engage with the outer peripheral end of the outer surface of the motor brackets 26 and 27 by bending to bind with the frame 22. ing.

Further, in contrast to the cooling fin member 28 having the above configuration, in the present embodiment, the outer peripheral portion of the frame 22 is provided with a groove portion 29 into which the mounting flange 28b can be inserted in the axial direction. It extends and is provided in multiple numbers side by side in the circumferential direction. Although detailed illustration is omitted, this groove portion 29 also has the same shape as the groove portion 15 in the first embodiment. The cooling fin member 28 is detachably attached to the outer peripheral surface of the frame 22 by being axially inserted into the groove 29 of the frame 22 . After the cooling fin members 28 are inserted into the grooves 29, the binding portions 28c are bent inwardly to engage with the ends of the motor brackets 26 and 27 to obtain a binding force to the frame 22. can.

According to the second embodiment having the above configuration, the plurality of cooling fin members 28 provided on the outer peripheral surface of the frame 22 are separate from the frame 22 and detachably attached to the frame 22. be done. Therefore, the cooling fin members 28 can be dispensed with or removed from the outer peripheral surface of the frame 22 at positions where there is a risk of interfering with the outside. 28 can be provided. At this time, the mounting flange 28b of the cooling fin member 28 is in surface contact with the frame 22, and since the heat radiating portion 28a of the cooling fin member 28 is of a double-fold type, a single unit can be installed without increasing the size in the outer peripheral direction. The cooling fin member 28 provides a wide heat radiation area, and the cooling air flows inside the heat radiation portion 28a.

As a result, the cooling performance of a single cooling fin member 28 can be enhanced. In other words, even if the number of attached cooling fin members 28 is partially reduced, the necessary cooling performance can be obtained as a whole. In addition, by utilizing the springiness of the cooling fin members 28, it is possible to attach them to the frame 22 and bring them into close contact with each other. As a result, according to the present embodiment, although the cooling fins 28 are provided, sufficient cooling performance is ensured, while the fins 28 are prevented from partially interfering with the outside depending on the installation location. It is possible to obtain an excellent effect that it can be easily avoided.

Particularly in this embodiment, the outer peripheral portion of the frame 22 is provided with a plurality of grooves 29 into which the mounting flanges 28b of the cooling fin members 28 can be axially inserted. Accordingly, by axially inserting the mounting flange 28b into the groove 29, the cooling fin member 28 can be easily mounted at a predetermined position. At this time, by utilizing the springiness of the cooling fin member 28, it is possible to obtain a holding force in the groove 29, and to bring the mounting flange 28b into close contact with the inner surface of the groove 29 to obtain surface contact force. Removal of the cooling fin member 28 from the groove 29 of the frame 22 is also facilitated.

Furthermore, in the present embodiment, the cooling fin member 28 is positioned at the end in the axial direction of the frame 22 and is bent to engage with the ends of the motor brackets 26 and 27 to bind to the frame 22 . 28c is provided integrally. As a result, the frame 22 and the motor brackets 26, 27 are bound by the binding portion 28c, so that the structure for attaching the motor brackets 26, 27 can be omitted. Therefore, the cooling fin member 28 has a function of binding the motor brackets 26 and 27 in addition to the function of cooling, so that the practical function can be further enhanced.

(3) Third Embodiment and Other Embodiments FIG. 7 shows a third embodiment, which differs from the first embodiment in the configuration of the cooling fin members 31 . The cooling fin member 31 of the present embodiment is formed by dividing the cooling fin member 14 of the first embodiment into two in the axial direction of the stator core 12, namely first and second divided fins. 32 and 33. These first and second split fins 32 and 33 integrally have heat radiating portions 32a and 33a and mounting flanges 32b and 33b. 32c integrally, and the other end of the second split fin 33 integrally has a binding portion 33c.

In this embodiment, the first split fin 32 is inserted into the groove 15 of the stator core 12 from one end side (left side in the drawing), and the second split fin 33 is inserted into the groove 15 of the stator core 12. On the other hand, it is inserted and attached from the other end side (right side in the figure). According to the third embodiment, the same effects as those of the first embodiment can be obtained. At the same time, when the cooling fin member 31 is assembled, the insertion amount (length) of each of the first and second split fins 32 and 33 into the groove portion 15 can be reduced. As a result, the insertion resistance of the first and second split fins 32 and 33 can be relatively small, and the insertion workability can be improved.

In each of the above embodiments, the heat radiating portions 14a and 28a of the cooling fin members 14 and 28 are configured to have a U-shaped cross section, but they may be configured to have a V-shaped cross section. Also, the binding portions 14c, 28c of the cooling fin members 14, 28 may not necessarily be provided. A configuration in which the cooling fin members are attached by means of bolting, welding, brazing, or the like without providing grooves in the stator core or frame may be employed. In addition, the present invention can be applied not only to motors for elevators, but also to various applications and types of rotating electric machines.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

In the drawings, 1 and 21 are motors (rotary electric machines), 2 and 23 are stators, 3, 4, 26 and 27 are motor brackets, 5 are rotors, 8 are rotating shafts, 9 and 10 are bearings, and 11 are fans. , 12 and 24 are stator cores, 12a is an electromagnetic steel plate, 13 is windings, 14, 28 and 31 are cooling fin members, 14a, 28a, 32a and 33a are radiators, and 14b, 28b, 32b and 33b are mounting parts. 14c, 28c, 32c and 33c are binding portions, 15 and 29 are groove portions, and 32 and 33 are dividing fins.

Claims (6)

a stator core configured by laminating electromagnetic steel sheets;
A plurality of cooling fin members provided extending in the axial direction on the outer peripheral surface of the stator core,
The cooling fin member is formed by folding a plate material having springiness in two such that the inner side is in a form that allows cooling air to flow, and the folded portion extends axially toward the outer peripheral side. and integrally provided with mounting flanges on both sides of the edge located on the inner peripheral side,
A rotary electric machine that is detachably mounted on the outer peripheral surface of the stator core so as to be in surface contact with the stator core. 2. The electric rotating machine according to claim 1, wherein a plurality of grooves into which mounting flanges of said cooling fin members can be axially inserted are provided in an outer peripheral portion of said stator core. The cooling fin member is integrally provided with a binding portion which is positioned at an axial end of the stator core and which is engaged with the end of the stator core by bending to bind the electromagnetic steel plates together. 3. The electric rotating machine according to claim 1, further comprising: A cylindrical frame, a stator core provided on the inner periphery of the frame, a motor bracket provided on the axial end of the frame for supporting the rotating shaft, and a motor bracket extending axially on the outer peripheral surface of the frame. A plurality of cooling fin members provided at the
The cooling fin member is formed by folding a plate material having springiness in two such that the inner side is in a form that allows cooling air to flow, and the folded portion extends axially toward the outer peripheral side. and integrally provided with mounting flanges on both sides of the edge located on the inner peripheral side,
A rotating electrical machine that is detachably attached to the outer peripheral surface of the frame so as to be in surface contact with the frame. 5. The electric rotating machine according to claim 4, wherein the outer peripheral portion of the frame is provided with a plurality of grooves into which the mounting flanges of the cooling fin members can be axially inserted. 5. The cooling fin member is integrally provided with a binding portion which is positioned at an axial end of the frame and is bent to engage with the motor bracket and bind with the frame. 6. The rotary electric machine according to 5.

Images