JP2013150383A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which reduces vibrations and noise.SOLUTION: According to one embodiment, a rotary electric machine includes: a stator 30 which has a stator frame 16 having a polygonal outer shape and a stator core 32 fixed to the stator frame; and a rotor provided so as to rotate relative to the stator. The stator frame has an upper side 17a horizontally extending and a leg seat 18 provided on a diagonal line connecting a corner with another corner of the polygonal shape and attached to an installation supporter.

Description

  Embodiments described herein relate generally to a rotating electrical machine.

  For example, a rotating electrical machine used for a hoisting machine of an elevator includes a cylindrical stator core and a rotor that is rotatably supported inside the stator core. A plurality of slits are formed in the stator core, and stator coils are embedded in these slits. The stator core is usually configured by laminating a large number of annular electromagnetic steel plates. The stator core is attached to, for example, an annular stator frame. Then, the rotating electrical machine is installed at a predetermined position by fixing the legs of the stator frame to a machine beam or the like at the installation location.

JP 2008-029150 A JP 2008-099491 A

  In the rotating electric machine described above, when the operation is started and the rotor rotates, the stator core is deformed and oscillated in the radial direction by the electromagnetic force generated in the gap between the stator core and the rotor core. Since the speed changes due to the speed control operation by the inverter, when the frequency of the electromagnetic force is close to or resonates with the natural frequency of the stator core including the stator frame, large vibration and noise are generated. This vibration is transmitted from the stator frame to the legs and the machine beam, and the floor of the machine room in which the rotating electrical machine is installed vibrates, which can be a problem.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating electrical machine that reduces the generation of vibration and noise and has improved reliability and durability.

  According to the embodiment, the rotating electrical machine is provided so as to be rotatable with respect to the stator, a stator frame having a polygonal outer shape, a stator having a stator core fixed to the stator frame, and the stator. The stator frame has an upper side that extends horizontally, and a leg seat that is provided on a diagonal line connecting the corners of the polygon and attached to the installation support. .

FIG. 1 is a perspective view showing a rotating electrical machine according to the first embodiment. FIG. 2 is a longitudinal sectional view showing a flow of cooling air of the rotating electric machine. FIG. 3 is a perspective view showing a stator frame of the rotating electrical machine. FIG. 4 is a perspective view showing spacers (ribs) arranged between the stator frame and the stator core. FIG. 5 is a perspective view showing a stator core of the rotating electric machine. FIG. 6 is a side view showing the stator core, the stator frame, and the leg seat. FIG. 7 is a perspective view showing a state in which the stator frame of the rotating electrical machine is installed on the counterpart machine beam. FIG. 8 is a perspective view showing a rotor of the rotating electrical machine. FIG. 9 is a plan view for explaining a generation mechanism of electromagnetic force frequency vibration in the rotating electrical machine. FIG. 10 is a diagram schematically illustrating a vibration mode of the rotating electrical machine. FIG. 11 is a diagram illustrating a relationship between an operation frequency and vibration acceleration. FIG. 12 is a diagram schematically showing a vibration mode of the rotating electrical machine. FIG. 13 is a side view showing a stator frame and a stator core of a rotating electrical machine according to a second embodiment. FIG. 14 is a side view showing a stator frame and a stator core of a rotating electrical machine according to a third embodiment. FIG. 15 is a side view showing a stator frame and a stator core of a rotating electrical machine according to a fourth embodiment.

  Various embodiments will be described below with reference to the drawings. In addition, the same code | symbol shall be attached | subjected to a common structure through embodiment, and the overlapping description is abbreviate | omitted. In addition, each drawing is a schematic diagram for promoting the embodiment and its understanding, and its shape, dimensions, ratio, etc. are different from the actual device, but these are considered in consideration of the following description and known techniques. The design can be changed as appropriate.

(First embodiment)
FIG. 1 shows a rotating electrical machine 10 according to the first embodiment, FIG. 2 shows a longitudinal section of the rotating electrical machine 10, and FIGS. 3 to 11 show various components of the rotating electrical machine 10.
As shown in FIGS. 1 and 2, the rotating electrical machine 10 includes a stator frame 12, a cylindrical stator 30 supported in the fixed frame, and a rotor 40 that is rotatably provided inside the stator. And cooling fans 50a and 50b formed on the rotor 40, and a pair of fan covers 60a and 60b covering both sides of the stator and the rotor.

  As shown in FIGS. 1 and 3, the stator frame 12 includes a cylindrical frame 14 and a pair of polygonal frames (polygonal stator frames) 16 integrally formed on the outer peripheral portions at both axial ends of the cylindrical frame. ing. The polygon frame 16 is formed in an annular shape, and the outer shape is formed in a polygon, for example, a hexagon. In the present embodiment, the pair of polygonal frames 16 are arranged at intervals in the axial direction of the cylindrical frame 14 and are arranged symmetrically with each other.

  The stator frame 12 includes a pair of leg seats 18 integrally formed at the lower corner of the polygon frame 16. A plurality of exhaust holes 20, for example, rectangular exhaust holes 20 are formed in the cylindrical frame 14, and are provided at intervals along the circumferential direction. In the present embodiment, the exhaust holes 20 are provided in the vicinity of the corners of the polygonal frame 16. In addition, a small-diameter circular exhaust hole 22 is formed at the upper end of the cylindrical frame 14, that is, the upper end in the vertical direction. A plurality of reinforcing ribs 24 are integrally formed on the lower outer surface of the cylindrical frame 14 in the vicinity of the leg seat 18.

  As shown in FIGS. 2, 5, and 6, the stator 30 includes a cylindrical stator core 32. The stator core 32 is configured by laminating a plurality of annular metal plates made of a magnetic material, for example, an electromagnetic steel plate. A plurality of slots extending in the axial direction are formed in the inner peripheral portion of the stator core 32, and the stator core coil 34 is embedded in these slots. The coil ends of the iron core coil 34 project axially from both end faces of the stator iron core 32. A stator 30 is constituted by the stator core 32 and the iron core coil 34.

  The stator core 32 has a relatively large outer shape in order to increase the capacity of the rotating electrical machine 10. At that time, each metal plate constituting the stator core 32 is press-molded by dividing it into a plurality of, for example, eight in the circumferential direction due to dimensional limitations of the punching press machine, and the eight divided plates 31 are joined together. An annular metal plate is formed. A plurality of metal plates are stacked by lap stacking (alternate stacking). That is, the seams 37 of the odd-numbered metal plates are positioned side by side in the axial direction of the stator core 32, and the seams 39 of the even-numbered metal plates are positioned side by side in the axial direction of the stator core 32. Yes. Further, the seam 37 of the odd-numbered metal plate is positioned so as to be shifted in the circumferential direction with respect to the seam 39 of the even-numbered metal plate. Metal plates are stacked.

  In this way, when the stator core 32 is configured by joining a plurality of divided pieces, the annular bending rigidity is reduced as compared with an integrally punched stator core that is not divided in the circumferential direction. Therefore, according to the present embodiment, the rib-like spacers 36 are overlapped on the lap joints on the outer peripheral side of the stator core 32, that is, the seams 37, 39 between the divided plates 31, and fixed to the stator core 32 by, for example, welding. Furthermore, the annular bending rigidity of the stator core 32 is reinforced by being coupled to the cylindrical frame 14. Reinforcing improves the annular bending rigidity of the stator core, so that the natural frequency can be increased.

  In a rotating electric machine having a small capacity, the stator core 32 may be configured by stacking a plurality of annular electromagnetic steel plates that are punched integrally without being divided. In this case, the stator core has sufficient annular bending rigidity, and the rib-like spacer 36 can be disposed at an arbitrary position with respect to the stator core.

  The outer diameter Q2 of the stator core 32 is formed to be slightly smaller than the inner diameter Q1 of the cylindrical frame 14. The stator core 32 is coaxially disposed in the cylindrical frame 14, and a plurality of spacers 36 are fitted between the outer peripheral surface of the stator core 32 and the cylindrical frame 14. Each spacer 36 is formed in an elongated prismatic shape (rib shape). As shown in FIGS. 4 and 5, the majority of the spacers 36 have a recess 36a formed at the center thereof. These spacers 36 extend in the axial direction of the stator core 32, and are arranged side by side at a constant interval in the circumferential direction of the stator core 32. The spacer 36 having the recess 36 a is installed, for example, in a state where the recess 36 a side faces the inner peripheral surface of the cylindrical frame 14.

  In the present embodiment, as shown in FIGS. 5 and 6, the plurality of spacers 36 are fixed to the outer peripheral surface of the stator core 32, and the stator core 32 is fitted into the cylindrical frame 14 by press-fitting or shrink fitting. As a result, the stator core 32 is coaxially fixed in the cylindrical frame 14. The stator core 32 is fixed and held in the cylindrical frame 14 by an iron core presser (not shown).

  As shown in FIGS. 2, 3, 5, and 6, a cooling air passage 35 through which cooling air to be described later flows is formed by a gap between the outer peripheral surface of the stator core 32 and the inner peripheral surface of the cylindrical frame 14. Is formed. Here, the spaces partitioned by the adjacent spacers 36 communicate with each other through the recesses 36 a of the spacers 36. The plurality of exhaust holes 20 and 22 formed in the cylindrical frame 14 are opened and communicated with the cooling air passage 35. Note that most of the exhaust holes 20 are provided in the cylindrical frame 14 between two adjacent spacers 36, and some of the exhaust holes 20 overlap the spacers and are formed in the cylindrical frame.

  The spacer 36 positioned so as to overlap substantially the center in the circumferential direction of the exhaust hole 20 does not have the recess 36a and is formed solid. Therefore, the spacer 36 acts as a windbreak plate so that the warm air of the cooling air does not further travel to the outer side of the stator core 32, and further guides the cooling air flowing through the cooling air passage 35 to the exhaust hole 20. Can function as.

  As shown in FIGS. 3, 9, and 10, the leg seat 18 of the stator frame 12 is positioned so as to face between the two adjacent spacers 36. The rotating electrical machine 10 is installed and supported on the counterpart machine beam 54 by fixing the leg seat 18 to the counterpart machine beam 54 having a rectangular frame shape as an installation support. At this time, by adopting a configuration in which the leg seat 18 of the stator frame 12 is disposed between the adjacent spacers 36, the electromagnetic vibration of the stator core 32 is not directly transmitted to the machine beam. Therefore, vibration transmission to the counterpart machine beam 54 is reduced, and noise due to the vibration of the counterpart machine beam can be reduced.

  As shown in FIG. 2 and FIG. 8, the rotor 40 includes a rotating shaft 42, a cylindrical rotor core 44 fixed substantially in the center in the axial direction of the rotating shaft, and an unillustrated iron core fixed to the rotating shaft. And a presser. The rotating shaft 42 extends coaxially with the stator core 32, and both axial ends thereof are rotatably supported by bearings (not shown). The rotor core 44 is coaxially positioned with a gap inside the stator core 32. A driving side end 42a of the rotating shaft 42 penetrates a fan cover described later and extends outside the machine.

  The rotor core 44 is configured by laminating a large number of annular metal plates made of a magnetic material, for example, a silicon steel plate, and a permanent magnet (not shown) is disposed therein. By energizing the stator core coil 34, the rotor core 44 rotates, and the rotating shaft 42 rotates together with the stator core. Thus, a permanent magnet type rotating electrical machine is configured. The rotor 40 may be cage-shaped to constitute an induction type rotating electrical machine.

  A plurality of fins 52 are fixed to both end surfaces in the axial direction of the rotor core 44, and constitute cooling fans 50a and 50b, respectively. The fins 52 are each formed in a rectangular plate shape, and the plurality of fins 52 extend radially with respect to the rotation center of the rotor core 44 and are arranged at equal intervals in the circumferential direction. The cooling fans 50a and 50b rotate together with the rotor 40, as will be described later, sucking outside air and ejecting it radially outward.

  As shown in FIGS. 1 and 2, the fan covers 60 a and 60 b are formed in a disk shape (substantially dish shape) whose outer peripheral portions are bent and bent inward. The fan covers 60a and 60b are made of metal, for example, a thin steel plate having a thickness of 3.2 mm. The fan cover 60 a has a peripheral edge fixed to the stator frame 12, arranged coaxially with the stator 30 and the rotor 40, and covers one end side of the stator 30 and the rotor 40. A space through which cooling air flows is formed between the fan cover 60 a and the stator 30 and the rotor 40. A circular air inlet 62 a is formed at the center of the fan cover 60. The air inlet 62 a is located coaxially with the rotor 40. The output side end of the rotating shaft 42 extends outside the machine through the air inlet 62a.

  The other fan cover 60b is fixed to the stator frame 12 at its peripheral edge, and is disposed coaxially with the stator 30 and the rotor 40, and covers the other end of the stator 30 and the rotor 40. Yes. A space through which cooling air flows is formed between the fan cover 60 b and the stator 30 and the rotor 40. An annular air inlet 62b is formed at the center of the fan cover 60b. The air inlet 62b is positioned coaxially with the rotor 40.

  As shown in FIG. 2, when the cooling fans 50a and 50b rotate together with the rotor 40, outside air (cooling air) is sucked into the apparatus from the intake ports 62a and 62b of the fan covers 60a and 60b, and is radiated by the cooling fans 50a and 50b. Sent out of the direction. The cooling air passes through the coil end of the stator core coil 34 and cools it, and then flows through the cooling air passage 35 between the stator core 32 and the cylindrical frame 14 to cool the stator core 32. Thereafter, the cooling air is exhausted from the exhaust hole 20 to the outside of the machine. In this manner, by applying cooling air to the iron core coil (copper loss) 34 and the stator iron core (iron loss) 32 that are generated heat sources, heat is radiated to the outside air, and the temperature rise of these heat sources is suppressed.

  In the rotary electric machine 10 configured as described above, a generation mechanism of vibration will be described. 9 to 12 are diagrams for explaining the mechanism of vibration generation. As shown in FIG. 9, the frequency of the electromagnetic force acting on the air gap between the stator core 32 of the stator 30 and the rotor 40 and the natural frequency of the stator core 32 including the stator frame 12 are close or When resonating, the stator iron core 32 vibrates, and the vibration is transmitted from the stator frame 12 to the leg seat 18 and the counterpart machine beam 54, and further transmitted to the floor of the machine room.

  The deformation mode of the stator frame 12 by this electromagnetic force is generally an elliptical shape (n = 2) of an annular vibration mode. This annular vibration mode is a mode in which the outer shape is deformed in the radial direction as shown in FIG. 10, and is represented by an ellipse (mode n = 2). The outer periphery of the stator iron core 32 and the stator frame 12 that supports the stator core 32 in the rotary electric machine 10 are often cylindrical in shape (perpendicular to the rotation axis).

  In this case, as shown in FIG. 11, when the vertical axis is the vibration level and the horizontal axis is the operating frequency, two large peaks are seen at the operating frequency of the rotating electrical machine 10 at 35 Hz and 37 Hz. This is a vibration generated by the influence of resonance. If the operating frequency is from 0 Hz to 31 Hz, it is below the allowable vibration level. Therefore, if the operating frequency is not set to 32 Hz or more before resonating with two large peaks of 35 Hz and 37 Hz, there is no influence of vibration.

  The principle of vibration generation will be specifically described. Since the electromagnetic force is a rotating magnetic field, when viewed from a position where the stator core 32 is located, the inner diameter of the stator core 32 is changed as a forced vibration mainly rotating with time at n = 2 (ellipse). A certain vibration mode occurs.

(1) When the natural frequency of the stator core 32 including the stator frame 12 is close to or resonates with the frequency of the electromagnetic force, the vibration mode during operation is the natural vibration of the stator core 32, that is, the structural system. Depends on mode.

(2) The vibration mode of the stator core 32, that is, the structural system is a standing wave and does not rotate. A specific location of the stator core 32 is always a vibration belly or node. However, since the stator core 32 has an annular shape, the standing wave of the natural vibration mode of the structural system is governed by the shape of the stator frame 12. That is, as shown in FIGS. 1, 6, and 10, when the stator frame 12 has a substantially polygonal side portion and a corner portion, the side portions XX and YY lines. Becomes a belly of vibration mode because of its low mechanical rigidity. The ZZ line and WW line, which are corners, are nodes of the vibration mode because of their high mechanical rigidity. Furthermore, at the peak of 37 Hz, the ZZ line and the WW line, which are corners, have high mechanical rigidity, so that the vibration nodes and antinodes are at different positions, and the natural frequency increases. Therefore, vibration transmission is reduced by providing the leg seat 18 at the node of the vibration mode.

  Therefore, according to the present embodiment, as shown in FIGS. 1, 3, 6, and 7, the polygonal frame 16 of the stator frame 12 includes an upper side 17a that extends horizontally, corners of the polygon, and the like. And a leg seat 18 provided on a diagonal line (WW line, ZZ line) connecting the corners. The outer shape of the polygonal frame 16 is, for example, an approximately octagon, and leg seats 18 are provided at two corners facing in the horizontal direction. According to this embodiment, in the polygonal frame 16, the lower side in the vertical direction is formed in a circular shape coaxial with the stator core 32. The polygonal frame 16 has two side edges 17b that extend in the vertical direction and face each other, and the length of the side edge 17b is approximately twice as long as the length L of the upper edge 17a. ing.

  According to the rotating electrical machine configured as described above, the stator frame includes a polygonal frame having a polygonal outer shape, and the leg frame 18 is provided on the stator frame 12 at the position of the vibration mode. The transmission of vibrations to the counterpart machine beam 54 is reduced, and furthermore, the noise on the entire rotating electrical machine can be reduced because no vibration is generated on the counterpart machine beam side. Thereby, even when the frequency of the electromagnetic force and the frequency of the structural system of the stator core including the stator frame are close to each other, generation of vibration and noise can be suppressed.

  By making the upper side 17a of the polygon frame 16 horizontal and the length of the left and right side sides 17b twice (2L) of the length L of the upper side 17a, the machine of the stator frame 12 in the horizontal direction (horizontal direction) The mechanical rigidity is reduced. If the lower part of the polygonal frame 16 is circular, the mechanical rigidity in the horizontal XX line direction and the vertical YY line direction can be made equal. Therefore, the node of the vibration mode can be stably positioned, and the leg seat 18 can be disposed at an appropriate position. That is, a leg seat can be provided at the node of the vibration mode to reduce vibration transmission.

  With respect to the corners of the polygonal frame 16 of the stator frame 12, the side portion has a lower annular bending rigidity. By arranging, for example, side reinforcing ribs 24 on the vertical surface of the cylindrical frame 14 in the vicinity of the sides of the polygon frame 16 by welding, the annular bending rigidity of the stator core 32 is reinforced. Thereby, the natural frequency of the stator core 32 can be increased. Therefore, the deformation amount of the stator core 32 with respect to the electromagnetic force is reduced, and vibration and noise are reduced.

  Further, heat can be conducted from the stator core 32 to the side reinforcing ribs 24, and by arranging them vertically from the action of natural cooling, the cooling effect as a radiation fin and the rigidity reinforcement by the secondary moment of the cross section can be effectively performed. Therefore, the side reinforcing ribs 24 can simultaneously obtain the effects of the vibration surface and the cooling surface.

Next, a rotating electrical machine according to another embodiment will be described.
In the embodiments described below, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

(Second Embodiment)
FIG. 13 shows the stator 30 and the stator frame 12 of the rotating electrical machine according to the second embodiment.
As shown in the figure, in the second embodiment, the stator frame 12 has a cylindrical frame and a polygonal frame 16 integrally formed on the outer periphery of the cylindrical frame, and the polygonal frame 16 has an octagonal shape. It has an outer shape. The stator core 32 of the stator 30 is coaxially fitted inside the cylindrical frame. The polygon frame 16 is disposed so as to have an upper side 17a extending horizontally and two side sides 17b extending in the vertical direction. Further, the stator frame 12 has polygonal corners and leg seats 18 provided on the polygonal frame 16 on diagonal lines (WW line, ZZ line) connecting the corners. . In the present embodiment, the two leg seats 18 are provided at two corners facing each other in the horizontal direction.
In the second embodiment, the other configuration of the rotating electrical machine 10 is the same as that of the first embodiment described above.

(Third embodiment)
FIG. 14 shows the stator 30 and the stator frame 12 of the rotating electrical machine according to the third embodiment.
As shown in the figure, in the third embodiment, the stator frame 12 has a cylindrical frame and a polygonal frame 16 integrally formed on the outer periphery of the cylindrical frame. , Has a substantially square outer shape. The stator core 32 of the stator 30 is coaxially fitted inside the cylindrical frame. The polygon frame 16 is arranged so as to have an upper side 17a and a lower side 17c extending horizontally, and two side sides 17b extending in the vertical direction. Further, the stator frame 12 has polygonal corners and leg seats 18 provided on the polygonal frame 16 on diagonal lines (WW line, ZZ line) connecting the corners. . In the present embodiment, leg seats 18 are respectively provided at two corners of the polygonal frame 16 facing in the horizontal direction, here, at the two corners on the lower side of the polygonal frame 16.

  In the third embodiment, the other configuration of the rotating electrical machine 10 is the same as that of the first embodiment described above. By making the polygonal frame 16 a quadrangle, the space between the left and right leg seats 18 can be increased. Therefore, the width between the mounting positions of the stator frame 12 with respect to the machine beam can be widened, and the vibration and noise generated in the stator 30 can be effectively reduced.

(Fourth embodiment)
FIG. 15 shows the stator 30 and the stator frame 12 of the rotating electrical machine according to the fourth embodiment.
As shown in the figure, in the fourth embodiment, the stator frame 12 has a cylindrical frame and a polygonal frame 16 integrally formed on the outer periphery of the cylindrical frame, and the polygonal frame 16 is, for example, a trapezoid. It has the outer shape. The stator core 32 of the stator 30 is coaxially fitted inside the cylindrical frame. The polygonal frame 16 is arranged to have an upper side 17a extending horizontally, a lower side 17c extending horizontally and longer than the upper side 17a, and two side sides 17b extending obliquely with respect to the vertical direction. Further, the stator frame 12 has polygonal corners and leg seats 18 provided on the polygonal frame 16 on diagonal lines (WW line, ZZ line) connecting the corners. . In the present embodiment, leg seats 18 are respectively provided at two corners of the polygonal frame 16 facing in the horizontal direction, here, at the two corners on the lower side of the polygonal frame 16.

  By making the polygonal frame 16 into a trapezoidal shape, the distance between the left and right leg seats 18 can be further increased. Therefore, the width between the mounting positions of the stator frame 12 with respect to the machine beam can be widened, and the vibration and noise generated in the stator 30 can be effectively reduced.

  From the above, according to the first to fourth embodiments described above, a rotating electrical machine with reduced generation of vibration and noise and improved reliability and durability can be obtained.

Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.
The rotating electrical machine according to the present invention is not limited to a hoisting machine for an elevator, and can be applied to various rotating electrical machines. In the first to fourth embodiments, in a small rotating electric machine or the like, the stator core can be an integrated core in which metal plates formed in an annular shape are laminated. In this case, the stator frame 12 is used. The cylindrical frame may be omitted, and the polygonal frame 16 may be directly fixed and fitted to the outer periphery of the stator core. Further, the polygonal frame is not limited to a pair, and only one or three or more may be provided.

DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine, 12 ... Stator frame, 14 ... Cylindrical frame,
16 ... Polygonal frame, 17a ... Upper side, 17b ... Side, 17c ... Lower side, 18 ... Leg seat,
20, 22 ... exhaust holes, 24 ... side ribs, 30 ... stator, 31 ... dividing plate,
32 ... Stator core, 33 ... Slot, 34 ... Core coil, 35 ... Cooling air passage,
36 ... Spacer, 37, 39 ... Seam, 37 ... Cooling air passage, 40 ... Rotor,
42 ... Rotating shaft, 44 ... Rotor core

Claims (8)

A stator frame having a polygonal outer shape;
A stator having a stator core fixed to the stator frame;
A rotor provided rotatably with respect to the stator,
The stator frame is a rotating electrical machine having a horizontally extending upper side and leg seats provided on diagonal lines connecting the corners of the polygon and attached to an installation support.   2. The rotating electrical machine according to claim 1, wherein the polygonal outer shape of the stator frame is substantially octagonal, and the leg seats are provided at two corners opposed in the horizontal direction.   3. The rotating electrical machine according to claim 1, wherein in the polygonal shape of the stator frame, a lower side in a vertical direction is formed in a circular shape coaxial with the stator core.   The polygon of the stator frame has two sides extending in the vertical direction and facing each other, and the length of the side is formed to be 2L, which is almost twice the length L of the upper side. The rotating electrical machine according to any one of claims 1 to 3.   The rotating electrical machine according to claim 1, wherein the polygonal outer shape of the stator frame is substantially rectangular, and the leg seats are provided at two corners facing each other in the horizontal direction.   2. The rotating electrical machine according to claim 1, wherein the polygonal outer shape of the stator frame is substantially trapezoidal, and the leg seats are provided at two corners facing in the horizontal direction.   The stator frame includes a cylindrical frame and a polygonal frame provided on an outer periphery of the cylindrical frame and having the polygonal outer shape, and the stator core is fitted in the cylindrical frame. The rotating electrical machine according to any one of claims 1 to 6.   A plurality of rib-like spacers are fitted between the outer periphery of the stator core and the inner peripheral surface of the cylindrical frame, and a cooling air passage is provided between the outer periphery of the stator core and the inner peripheral surface of the cylindrical frame. The rotating electrical machine according to claim 7 provided.

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