Rotating electrical machinery, compressors, and refrigeration equipment

Abstract

The present invention provides a rotating electromachine that can reduce the compressive stress generated when connecting the stator to the casing by shrink fitting. [Solution] The stator (21) has a connecting portion (100) that connects to the casing (11). The connecting portion (100) has a first hole (101) whose radial length (a1) is longer than the length (b1) perpendicular to the radial direction when viewed from the axial direction, and a second hole (102) whose radial length (a2) is shorter than the length (b2) perpendicular to the radial direction. The first hole (101) and the second hole (102) are arranged alternately.

Description

Technical Field

[0001] The present disclosure relates to a rotating electrical machine, a compressor, and a refrigeration device.

Background Art

[0002] Press fitting is used as a method for fixing the stator of a motor to a casing. When the stator is fixed to the casing by press fitting, since the contraction force of the casing acts on the stator as compressive stress, there arises a problem that the magnetic characteristics deteriorate and the efficiency of the motor decreases.

[0003] Patent Document 1 discloses providing a gap in the outer peripheral portion of the stator in order to relieve the compressive stress from the casing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the motor of Patent Document 1, since stress propagates in the motor radial direction from the bridge portion formed in the gap, the compressive stress is not sufficiently reduced, so the iron loss increases.

[0006] An object of the present disclosure is to provide a rotating electrical machine capable of reducing the compressive stress generated when connecting a stator to a casing by press fitting.

Means for Solving the Problems

[0007] A first aspect of this disclosure is a rotating electric machine comprising a rotor (31) that rotates about a rotation axis (O), and a stator (21) arranged radially outward from the rotor (31) and having a core (22) made of laminated steel plates (22a). The rotor (31) and the stator (21) are housed in a casing (11) arranged radially outward from the stator (21). The stator (21) has a connecting portion (100) that connects to the casing (11). The connecting portion (100) has, viewed from the axial direction, a first hole (101) whose radial length (a1) is longer than its length (b1) in the direction perpendicular to the radial direction, and a second hole (102) whose radial length (a2) is shorter than its length (b2) in the direction perpendicular to the radial direction. The first hole (101) and the second hole (102) are arranged alternately.

[0008] In the first embodiment, in the connection portion (100) that connects the stator (21) to the casing (11), a first hole (101) that is longer in the radial direction and a second hole (102) that is longer in the direction perpendicular to the radial direction are arranged alternately when viewed from the axial direction. As a result, the connection portion (100) deforms in response to compressive stress from the casing (11), generating tensile stress, thereby reducing compressive stress.

[0009] A second aspect of the present disclosure, in the first aspect, the core (22) includes a back yoke (24) and a plurality of teeth (25) projecting radially inward from the back yoke (24).

[0010] In the second embodiment, the back yoke (24) is connected to the casing (11) via the connecting portion (100), thereby reducing the compressive stress on the back yoke (24) which forms the magnetic path.

[0011] A third aspect of the present disclosure, in the second aspect, the connecting portion (100) connects the back yoke (24) to the casing (11) in a region located radially outward of the teeth (25).

[0012] In the third embodiment, tensile stress from the connection portion (100) can be effectively applied to the inter-tooth region (25) that forms the main magnetic path in the back yoke (24).

[0013] A fourth aspect of the present disclosure, in the second aspect, the connecting portion (100) connects the back yoke (24) in a region located between adjacent teeth (25) to the casing (11).

[0014] In the fourth embodiment, the compressive stress generated in the back yoke (24) can be reduced compared to the conventional configuration in which the intertooth region of the back yoke is connected to the casing.

[0015] A fifth aspect of the present disclosure is that, in any one of the first to fourth aspects, the first hole (101) has a constriction (101a) in the radial center when viewed from the axial direction, and the second hole (102) has a constriction (102a) in the central direction perpendicular to the radial direction when viewed from the axial direction.

[0016] In the fifth embodiment, the connection portion (100) can be deformed such that a tensile stress is generated in the core (22) in response to a compressive stress from the casing (11).

[0017] A sixth aspect of the present disclosure is that in any one of the first to fifth aspects, the connecting portion (100) is formed integrally with the core (22).

[0018] In the sixth embodiment, the stator (21) is easily attached to the casing (11).

[0019] A seventh aspect of this disclosure is that, in any one of the first to fifth aspects, the connecting portion (100) is made of resin.

[0020] In the seventh embodiment, the propagation of vibrations from the rotating electric machine (20) to the casing (11) can be suppressed.

[0021] The eighth aspect of the present disclosure is a compressor including any one of the rotary electric machines (20) according to the first to seventh aspects.

[0022] In the eighth aspect, by using a highly efficient rotary electric machine (20) with low iron loss, the power consumption can be reduced.

[0023] The ninth aspect of the present disclosure is a refrigeration device including any one of the rotary electric machines (20) according to the first to seventh aspects.

[0024] In the ninth aspect, by using a highly efficient rotary electric machine (to) with low iron loss, the power consumption can be reduced.

Brief Description of the Drawings

[0025] [Figure 1] FIG. 1 is a schematic diagram showing a cross-sectional configuration of the motor according to Embodiment 1. [Figure 2A] FIG. 2A is a plan view of a connection portion (before shrink fitting) connecting the stator to the casing in the motor according to Embodiment 1, as viewed axially. [Figure 2B] FIG. 2B is a plan view of a connection portion (after shrink fitting) connecting the stator to the casing in the motor according to Embodiment 1, as viewed axially. [Figure 3] FIG. 3 is a schematic diagram explaining a mechanism in which tensile stress occurs in the connection portion in the motor according to Embodiment 1. [Figure 4A] FIG. 4A is a schematic diagram explaining a mechanism in which compressive stress generated in the core is reduced by the connection portion in the motor according to Embodiment 1. [Figure 4B] FIG. 4B is a schematic diagram explaining a mechanism in which compressive stress generated in the core is reduced by the connection portion in the motor according to Embodiment 1. [Figure 5] FIG. 5 is a schematic diagram showing a cross-sectional configuration of the motor of the comparative example. [Figure 6] FIGA is a schematic diagram showing a cross-sectional configuration of the motor of a modification of Embodiment 1. [Figure 7A]Figure 7A is a plan view from the axial direction of the connection portion (before shrink-fitting) that connects the stator to the casing in a modified example of Embodiment 1. [Figure 7B] Figure 7B is a schematic diagram showing the hole shape (before shrink-fitting) of the connection part that connects the stator to the casing in a modified example of Embodiment 1. [Figure 7C] Figure 7C is a schematic diagram showing the hole shape (before shrink-fitting) of the connection part that connects the stator to the casing in a modified example of Embodiment 1. [Figure 7D] Figure 7D is a schematic diagram showing the hole shape (before shrink-fitting) of the connection part that connects the stator to the casing in a modified example of Embodiment 1. [Figure 7E] Figure 7E is a schematic diagram showing the hole shape (before shrink-fitting) of the connection part that connects the stator to the casing in a modified example of Embodiment 1. [Figure 8] Figure 8 is a longitudinal cross-sectional view showing an example of the configuration of the compressor of Embodiment 2. [Figure 9] Figure 9 is a piping diagram showing an example of the configuration of the refrigeration system of Embodiment 3. [Modes for carrying out the invention]

[0026] Embodiments of this disclosure will be described below with reference to the drawings. The following embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or its uses. Furthermore, while the same reference numerals in the drawings represent the same components, dimensions such as length, width, thickness, and depth have been appropriately altered from the actual scale for clarity and simplification of the drawings and may not correspond to actual relative dimensions.

[0027] (Embodiment 1) <motor> As shown in Figure 1, the motor (20) of Embodiment 1 has a stator (21) and a rotor (31). The motor (20) is an example of a rotating electric machine (20). The motor (20) is configured as an inner rotor type. The stator (21) has a core (22) and a plurality of coils (23). The core (22) is arranged radially outward of the rotor (31). The rotor (31) is configured to rotate together with the drive shaft (40). The rotor (31) rotates about the axis of the drive shaft (40) (hereinafter referred to as the rotation axis (O)).

[0028] In this disclosure, the direction in which the rotational axis (O) extends is described as the "axial direction," the direction perpendicular to the "axial direction" is described as the "radial direction," and the direction around the rotational axis (O) is described as the "circumferential direction." Furthermore, a cross-section along the "axial direction" is described as a "longitudinal section," and a cross-section perpendicular to the "axial direction" is described as a "transverse section."

[0029] The core (22) is formed, for example, by stacking multiple electrical steel sheets (22a) in the axial direction. The core (22) has a cylindrical back yoke (24) and multiple teeth (25). The multiple teeth (25) extend radially inward from the inner circumferential surface of the back yoke (24). Multiple coils (23) are wound around the multiple teeth (25).

[0030] The rotor (31) and stator (21) are housed in a casing (11) positioned radially outward from the stator (21). The stator (21) is connected to the casing (11) by shrink-fitting. The casing (11) may be the casing of equipment (e.g., a compressor) into which the motor (20) is incorporated.

[0031] The stator (21) has a connecting portion (100) that connects to the casing (11). Multiple connecting portions (100) may be arranged discretely in the circumferential direction. The connecting portions (100) may be provided continuously from the upper end to the lower end in the axial direction of the stator (21), or they may be provided partially between the upper end and the lower end in the axial direction of the stator (21).

[0032] Note that the configuration of the motor (20) shown in Figure 1 is illustrative, and the number of poles of the motor (20), the shape of the core (22), the number of teeth (25) installed, the winding method of the coil (23), etc., are not particularly limited.

[0033] <Connection part> As shown in Figures 2A and 2B, the connecting portion (100) has, before and after shrink-fitting, a first hole (101) whose radial length (a1) is longer than its length (b1) perpendicular to the radial direction, and a second hole (102) whose radial length (a2) is shorter than its length (b2) perpendicular to the radial direction, when viewed from the axial direction. The first hole (101) and the second hole (102) are arranged alternately in the radial direction and the direction perpendicular to the radial direction.

[0034] The shapes of the first hole (101) and the second hole (102) are not particularly limited, as long as, when viewed from the axial direction, the first hole (101) has its major axis in the radial direction and the second hole (102) has its major axis perpendicular to the radial direction. However, the shapes of the first hole (101) and the second hole (102) before shrink fitting may be elliptical, as shown in Figure 2A, when viewed from the axial direction. Furthermore, after shrink fitting, as shown in Figure 2B, for example, the first hole (101) may have a constriction (101a) in the central part in the radial direction when viewed from the axial direction, and the second hole (102) may have a constriction (102a) in the central part in the direction perpendicular to the radial direction when viewed from the axial direction. In this case, the first hole (101) and the second hole (102) may be divided by the constrictions (101a, 102a).

[0035] As shown in Figure 2B, during shrink fitting, a compressive force acts on the connection part (100) from the casing (11). On the other hand, since the core (22) on which the connection part (100) is provided remains fixed, a compressive force also acts on the connection part (100) from the core (22) as a reaction force. As a result, compressive stress is generated in the radial direction of the connection part (100). Here, as shown in Figure 3, in a schematic diagram in which circles and straight lines are arranged, if the direction perpendicular to the direction in which the straight line extends is defined as the up and down direction, then when a force acts downward on a circle above the straight line and upward on a circle below the straight line, the straight line bends with the circle as the pivot point. As a result, the straight line contracts in the direction perpendicular to the direction in which the force is applied (the direction in which the straight line extends). Therefore, as shown in Figure 2B, the first hole (101) and the second hole (102) in the connection portion (100) deform from their pre-shrink-fit shapes, and at the same time, the connection portion (100) shrinks in both the radial direction and the direction perpendicular to the radial direction. In Figure 2B, the pre-shrink-fit shape of the connection portion (100), including the first hole (101) and the second hole (102), is shown by a dashed line.

[0036] More specifically, in the connection portion (100) where the first hole (101) and the second hole (102) are alternately arranged in the radial direction and the direction perpendicular to the radial direction, shrink fitting causes the second hole (102), which is longer in the direction perpendicular to the radial direction, to deform due to the compressive force from the casing (11), as shown in Figure 2B, so that it extends further in the direction perpendicular to the radial direction, and the connection portion (100) shrinks in the direction in which the compressive force acts (radial direction). On the other hand, as a result of the deformation of the second hole (102) so that it extends further in the direction perpendicular to the radial direction, the first hole (101), which is longer in the radial direction, also deforms so that it extends further in the radial direction, so the connection portion (100) also shrinks in the direction perpendicular to the direction in which the compressive force acts (radial direction).

[0037] As described above, the radial compressive force from the casing (11) causes contraction deformation of the connection portion (100) in a direction perpendicular to the radial direction, as shown in Figures 4A and 4B. Therefore, tensile stress (double arrows in Figure 4B) is generated in the core (22) (back yoke (24)) between adjacent connection portions (100) in the circumferential direction, thus reducing the compressive stress of the core (22) caused by shrink fitting.

[0038] The position of the connecting portion (100) is not particularly limited as long as it is possible to apply tensile stress to the core (22) between adjacent connecting portions (100) in the circumferential direction. For example, the connecting portion (100) may be positioned to connect the back yoke (24) in the region located radially outward of the teeth (25) to the casing (11).

[0039] The number of connection parts (100) is not particularly limited, as long as the stator (21) can be fixed to the casing (11). In the example shown in Figure 1, nine connection parts (100) are provided corresponding to the nine teeth (25), but it is sufficient to provide two or more connection parts (100), and it is preferable to provide three or more connection parts (100) in order to stably fix the stator (21).

[0040] The material of the connecting portion (100) is not particularly limited as long as it is a shrinkable material, but for example, the connecting portion (100) may be formed integrally with the core (22) using the same material as the core (22).

[0041] The opening ratio of the connecting portion (100) (the ratio of the total area of ​​the first hole (101) and the second hole (102) to the area of ​​the connecting portion (100) viewed from the axial direction before shrink fitting) is preferably 30% or more, and more preferably 45% or more, in order to generate sufficient shrinkage deformation due to the compressive force from the casing (11).

[0042] In order to evenly shrink the connecting portion (100), it is preferable that the arrangement of the first hole (101) and the second hole (102) be regularly alternating in both the radial direction and the direction perpendicular to the radial direction. However, the arrangement of the first hole (101) and the second hole (102) may be partially irregular as long as the connecting portion (100) can be shrunk almost uniformly.

[0043] <Features of Embodiment 1> In the motor (20) of Embodiment 1, the connection portion (100) that connects the stator (21) to the casing (11) has alternating first holes (101) that are longer in the radial direction and second holes (102) that are longer in the direction perpendicular to the radial direction, as viewed from the axial direction. As a result, the connection portion (100) deforms in response to compressive stress from the casing (11), generating tensile stress, thereby reducing compressive stress. Consequently, iron loss can be reduced and the efficiency of the motor (20) can be improved.

[0044] In contrast, in the motor (20) of the comparative example (conventional structure) shown in Figure 5, in which the stator (21) is connected to the casing (11) by a connecting part (150) without a first hole (101) and a second hole (102), when the casing (11) shrinks radially due to shrink-fitting, compressive stress is generated throughout the core (22) through the connecting part (150), increasing iron loss and reducing the efficiency of the motor (20).

[0045] In the motor (20) of Embodiment 1, the stator (21) is connected to the casing (11) using a connection part (100) provided with a first hole (101) and a second hole (102). Therefore, vibrations transmitted from the motor (20) to the casing (11) can be attenuated by the connection part (100).

[0046] In the motor (20) of Embodiment 1, the core (22) may include a back yoke (24) and a plurality of teeth (25) protruding radially inward from the back yoke (24). As a result, the back yoke (24) is connected to the casing (11) via a connecting portion (100), thereby reducing the compressive stress on the back yoke (24) which forms the magnetic path. In this case, if the connecting portion (100) connects the back yoke (24) to the casing (11) in the region located radially outward of the teeth (25), then tensile stress from the connecting portion (100) can be effectively applied to the region between the teeth (25) which forms the main magnetic path in the back yoke (24).

[0047] In the motor (20) of Embodiment 1, if the first hole (101) has a constriction (101a) in the radial center when viewed from the axial direction, and the second hole (102) has a constriction (102a) in the center in a direction perpendicular to the radial direction when viewed from the axial direction, the connection portion (100) can be deformed so that a tensile stress is generated in the core (22) in response to the compressive stress from the casing (11).

[0048] In the motor (20) of Embodiment 1, if the connection portion (100) is formed integrally with the core (22), it becomes easier to attach the stator (21) to the casing (11).

[0049] (Modified version of Embodiment 1) In the above embodiment 1, as shown in Figure 1, the connecting portion (100) connects the back yoke (24) in the region located radially outward of the teeth (25) to the casing (11). However, instead, as shown in Figure 6, the connecting portion (100) may connect the back yoke (24) in the region located between adjacent teeth (25) to the casing (11). In Figure 6, the same elements as in the above embodiment 1 shown in Figure 1 are denoted by the same reference numerals. In the modified example shown in Figure 6, the compressive stress generated in the back yoke (24) can be reduced compared to the conventional configuration in which the inter-teeth region of the back yoke is connected to the casing. In the modified example shown in Figure 6, nine connecting portions (100) are provided between the nine teeth (25), but it is sufficient to provide two or more connecting portions (100), and it is preferable to provide three or more connecting portions (100) in order to stably fix the stator (21).

[0050] In the above embodiment 1, the connecting portion (100) was formed integrally with the core (22) using the same material as the core (22). However, instead, the connecting portion (100) may be formed from a different material than the core (22), for example, from a resin such as polyphenylene sulfide (PPS), liquid crystal polymer (LCP), or polybutylene terephthalate (PBT), or from rubber. Doing so can further suppress the transmission of vibrations from the motor (20) to the casing (11).

[0051] In the above embodiment 1, the shapes of the first hole (101) and the second hole (102) before shrink-fitting were elliptical when viewed from the axial direction, as shown in Figure 2A. However, the shapes of the first hole (101) and the second hole (102) before shrink-fitting are not particularly limited, as long as the first hole (101) has a major axis in the radial direction and the second hole (102) has a major axis perpendicular to the radial direction. For example, as shown in Figure 7A, the first hole (101) may be a rhombus with a major axis in the radial direction when viewed from the axial direction, and the second hole (102) may be a rhombus with a major axis perpendicular to the radial direction when viewed from the axial direction. Alternatively, the shapes of the first hole (101) and the second hole (102) before shrink-fitting may be polygons (non-regular polygons) as shown in Figures 7B, 7C, and 7D. In this case, the corners may be rounded, as shown in Figure 7B.

[0052] In the above embodiment 1, the shape (dimensions) of the multiple first holes (101) as viewed from the axial direction was made the same, and the shape (dimensions) of the multiple second holes (102) as viewed from the axial direction was made the same. However, instead, as shown in Figure 7E, the shape (dimensions) of the multiple first holes (101) as viewed from the axial direction may differ depending on their placement location, etc., and the shape (dimensions) of the multiple second holes (102) as viewed from the axial direction may differ depending on their placement location, etc.

[0053] (Embodiment 2) As shown in Figure 8, the compressor (10) of Embodiment 2 is a rotary compressor. The compressor (10) has a casing (11), the motor (20) of Embodiment 1, a drive shaft (40), and a compression mechanism (50). In the following description, "up", "down", "right", and "left" refer to the directions when the compressor (10) is viewed from the front (see arrows in Figure 8). "Up" and "down" are also the axial directions of the drive shaft (40). "Right" and "left" are directions perpendicular to the axial direction and are also the radial directions of the motor (20) (or casing (11)).

[0054] The casing (11) is a completely sealed container. The inside of the casing (11) is filled with high-pressure refrigerant discharged from the compression mechanism (50). The casing (11) is made of a metallic material. The casing (11) has a body (12), a bottom (13), and a top (14). The body (12) is a cylindrical member that extends vertically. The axis of the cylinder of the body (12) is vertical. The bottom (13) closes the lower end of the body (12), and the top (14) closes the upper end of the body (12). The casing (11) houses the motor (20), the drive shaft (40), and the compression mechanism (50) from top to bottom.

[0055] The motor (20) has its rotational speed controlled by an inverter device. In other words, the compressor (10) is an inverter type with a variable rotational speed. The stator (21) of the motor (20) is fixed to the inner surface of the body (12). The rotor (31) of the motor (20) rotates around the rotation axis (O), as described in Embodiment 1 above. The drive shaft (40) extends downward from the motor (20). The drive shaft (40) is rotationally driven by the motor (20). The drive shaft (40) is rotatably supported by a bearing (41) located below the motor (20).

[0056] The compression mechanism (50) includes a cylinder (51) and a piston (52) provided inside the cylinder (51). A cylinder chamber (53) is formed between the inner surface of the cylinder (51) and the outer surface of the piston (52). In the cylinder chamber (53), the piston (52), driven by the drive shaft (40), compresses the fluid.

[0057] The compressor (10) has an intake pipe (15) and a discharge pipe (16). The intake pipe (15) penetrates the body (12) radially and communicates with the cylinder chamber (53). Low-pressure refrigerant is drawn into the cylinder chamber (53) through the intake pipe (15). The discharge pipe (16) penetrates the top (14) axially and communicates with the internal space of the casing (11). The refrigerant compressed by the compression mechanism (50) flows through the core cut (not shown) of the motor (20) and is then discharged from the discharge pipe (16).

[0058] The compressor (10) of Embodiment 2 is equipped with the motor (20) of Embodiment 1, which enables a reduction in power consumption.

[0059] Note that the configuration of the compressor (10) shown in Figure 8 is illustrative, and the compressor (10) is not limited to a rotary compressor. The compressor (10) may be a swing type, scroll type, screw type, turbo type, or other type of compressor.

[0060] (Embodiment 3) As shown in Figure 9, the refrigeration device (1) of Embodiment 3 is an air conditioner. The air conditioner (1) may be for cooling only or for heating only. The air conditioner (1) has a refrigerant circuit (1a) filled with refrigerant. The refrigerant circuit (1a) has the compressor (10), radiator (2), expansion valve (3), and evaporator (4) of Embodiment 2. The refrigerant circuit (1a) performs a vapor compression type refrigeration cycle. The air conditioner (1) may be an air conditioner that switches between cooling and heating. In this case, the air conditioner (1) further has a switching mechanism (e.g., a four-way switching valve) for switching the direction of refrigerant circulation.

[0061] In the refrigeration cycle, the refrigerant compressed by the compressor (10) releases heat into the air in the heat exchanger (2). The refrigerant that has released heat is depressurized by the expansion valve (3) and evaporates in the evaporator (4). The evaporated refrigerant is drawn back into the compressor (10) (see arrow in Figure 9).

[0062] In the heat sink (2), heat exchange occurs between the refrigerant flowing through the heat sink (2) and the air blown by the first blower (BL1) driven by the first motor (M1). In the evaporator (4), heat exchange occurs between the refrigerant flowing through the evaporator (4) and the air blown by the second blower (BL2) driven by the second motor (M2).

[0063] The air conditioner (refrigeration unit) (1) of Embodiment 3 has a compressor (10) of Embodiment 2 equipped with the motor (20) of Embodiment 1, which makes it possible to reduce power consumption.

[0064] Note that the configuration of the refrigeration system (1) shown in Figure 9 is illustrative, and the refrigeration system (1) is not limited to an air conditioner. The refrigeration system (1) may also be a water heater, chiller unit, or cooling device that cools the air inside the storage area. The cooling device cools the air inside a refrigerator, freezer, or container.

[0065] Furthermore, in Embodiment 3, the motor (20) of Embodiment 1 was used as the motor to drive the compressor (10). However, in addition to this, or instead, the motor (20) may also be used as the motor (M1) to drive the first blower (BL1) and / or the motor (M2) to drive the second blower (BL2).

[0066] (Other embodiments) In the above embodiments (including modified examples), a motor (20) was described as a rotating electric machine, but a configuration similar to that of the motor (20) may also be applied to a generator.

[0067] Although embodiments have been described above, it will be understood that various modifications to the form and details are possible without departing from the spirit and scope of the claims. Furthermore, the above embodiments and modifications may be combined or substituted as appropriate. In addition, the designations "First," "Second," etc. in the specification and claims are used to distinguish the phrases to which these designations are attached, and do not limit the number or order of such phrases. [Industrial applicability]

[0068] As described above, this disclosure is useful for rotating electromachines, compressors and refrigeration equipment. [Explanation of Symbols]

[0069] 11 Casing 20. Motors (rotating electrical machinery) 21 status 22 cores 22a Electromagnetic steel plate (steel plate) 24 Back yoke 25 teeth 31 Rotors 34a 1st hole 100 connection part 101 Hole 1 101a Waist 102 Second hole 102a Waist O Rotation axis

Claims

1. A rotor (31) that rotates around the axis of rotation (O), A stator (21) is positioned radially outward from the rotor (31) and has a core (22) made of laminated steel plates (22a), Equipped with, The rotor (31) and the stator (21) are housed in a casing (11) positioned radially outward of the stator (21). The stator (21) has a connecting portion (100) that connects to the casing (11), The connecting portion (100) has, when viewed from the axial direction, a first hole (101) whose radial length (a1) is longer than the length (b1) in the direction perpendicular to the radial direction, and a second hole (102) whose radial length (a2) is shorter than the length (b2) in the direction perpendicular to the radial direction. The first hole (101) and the second hole (102) are arranged alternately. Rotating electrical machinery.

2. In the rotating electric machine according to claim 1, The core (22) includes a back yoke (24) and a plurality of teeth (25) projecting radially inward from the back yoke (24). Rotating electrical machinery.

3. In the rotating electric machine of claim 2, The connecting portion (100) connects the back yoke (24) in the region located radially outward of the teeth (25) to the casing (11). Rotating electrical machinery.

4. In the rotating electric machine of claim 2, The connecting portion (100) connects the back yoke (24) in the region located between adjacent teeth (25) to the casing (11). Rotating electrical machinery.

5. In the rotating electric machine according to claim 1, The first hole (101) has a constriction (101a) in the radial center when viewed from the axial direction, The second hole (102) has a constriction (102a) in the center in a direction perpendicular to the radial direction when viewed from the axial direction. Rotating electrical machinery.

6. In the rotating electric machine according to claim 1, The connecting portion (100) is formed integrally with the core (22). Rotating electrical machinery.

7. In the rotating electric machine according to claim 1, The connecting portion (100) is made of resin. Rotating electrical machinery.

8. A rotating electric machine according to any one of claims 1 to 7, Compressor.

9. A rotating electric machine according to any one of claims 1 to 7, Refrigeration equipment.

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