Rotary electric machine for air conditioner, compressor, and air conditioner

Abstract

A stator (21) has a core (22), a coil (23), a first insulating part (26), and a connection part (100). The coil (23) comprises a winding (23a) wound around each tooth (25). The first insulating part (26) is provided between the core (22) and the coil (23) and insulates between the core (22) and the coil (23). The connection part (100) connects the first insulating part (26) and the core (22). The connection part (100) is formed so as to be able to vibrate the coil (23) and the first insulating part (26) in the radial direction with respect to the core (22).

Description

Rotating electrical machinery, compressors, and air conditioning systems for air conditioning equipment

[0001] This disclosure relates to a rotating electric machine for air conditioning systems, a compressor, and an air conditioning system.

[0002] Patent Document 1 discloses a technique for suppressing vibrations of the annular vibration mode of a rotating electric machine by fixing vibration-damping weights to the outside of the stator at multiple positions in different circumferential directions.

[0003] Japanese Patent Publication No. 2016-119743

[0004] However, in the rotating electric machine described in Patent Document 1, it is necessary to provide vibration-damping weights on the outside of the stator, making it difficult to miniaturize the rotating electric machine.

[0005] The purpose of this disclosure is to miniaturize a rotating electrical machine having a mechanism capable of suppressing vibration, particularly a rotating electrical machine for air conditioning systems used in compressors for air conditioning systems.

[0006] A first aspect of the present disclosure is a rotary electric machine (20) for an air conditioning system, comprising a rotor (31) that rotates about a rotation axis (O), and a stator (21) positioned radially outward from the rotor (31). The stator (21) has a core (22), coils (23), a first insulating section (26), and a connecting section (100). The core (22) includes a cylindrical back yoke (24) and a plurality of teeth (25) projecting radially inward from the back yoke (24). The coil (23) consists of windings (23a) wound around each of the teeth (25). The first insulating section (26) is provided between the core (22) and the coil (23) and insulates the core (22) from the coil (23). The connecting section (100) connects the first insulating section (26) and the core (22). The connecting portion (100) is formed so that the coil (23) and the first insulating portion (26) can vibrate radially with respect to the core (22).

[0007] In the first embodiment, the connecting portion (100) that connects the first insulating portion (26) and the core (22) is formed so that the coil (23) and the first insulating portion (26) can vibrate radially relative to the core (22). Therefore, since the coil (23) and the first insulating portion (26) act as a dynamic vibration absorber that suppresses vibration, miniaturization can be achieved without providing a vibration damping structure on the outside of the stator (21).

[0008] A second aspect of the present disclosure, in the first aspect, the connecting portion (100) has a first elastic body (101) that connects the first insulating portion (26) and the core (22).

[0009] In the second embodiment, the coil (23) and the first insulating part (26) can be vibrated radially relative to the core (22) by the first elastic body (101) connecting the first insulating part (26) and the core (22).

[0010] A third aspect of the present disclosure, in the second aspect, the first elastic body (101) has a protrusion (101a), and the core (22) has a recess (22a) into which the protrusion (101a) is inserted.

[0011] In a third embodiment, the first elastic body (101) can be connected to the core (22) by inserting the convex portion (101a) of the first elastic body (101) into the concave portion (22a) of the core (22).

[0012] A fourth aspect of the present disclosure, in the second aspect, the core (22) is made of laminated steel plates and includes crimping portions (27) for fixing the steel plates together, and the first elastic body (101) is connected to the crimping portions (27).

[0013] In the fourth embodiment, the first elastic body (101) can be connected to the core (22) using a crimping portion (27) that fixes the laminated steel plates constituting the core (22).

[0014] A fifth aspect of the present disclosure is that in any one of the second to fourth aspects, the radial length of the first elastic body (101) is shorter than the length in the direction perpendicular to the radial direction.

[0015] In the fifth embodiment, the first elastic body (101) makes it easier to vibrate the coil (23) and the first insulating part (26) radially relative to the core (22).

[0016] A sixth aspect of the present disclosure is that, in any one of the second to fifth aspects, the material of the first elastic body (101) is the same as the material of the first insulating part (26).

[0017] In the sixth embodiment, the first elastic body (101) can be formed integrally with the first insulating portion (26).

[0018] A seventh aspect of the present disclosure, in the sixth aspect, is that the first elastic body (101) is formed integrally with the first insulating portion (26).

[0019] In the seventh embodiment, the connection between the first insulating part (26) and the core (22) can be easily made.

[0020] An eighth aspect of the present disclosure is that, in any one of the second to fifth aspects, the material of the first elastic body (101) is different from the material of the first insulating part (26).

[0021] In the eighth embodiment, the rigidity of the first elastic body (101) can be increased.

[0022] A ninth aspect of the present disclosure is that, in any one of the first to eighth aspects, the first insulating portion (26) is positioned between the teeth (25) and the coil (23) in the axial direction and between the teeth (25) and the coil (23) in the circumferential direction.

[0023] In the ninth embodiment, compared to the case where insulating paper separate from the first insulating part (26) is placed in the slot, insulation between the teeth (25) and the coil (23) in the circumferential direction can be easily achieved.

[0024] A tenth aspect of the present disclosure is, in any one of the first to ninth aspects, the stator (21) comprises a second insulating portion (28) positioned axially outward of the back yoke (24) and fixed to the core (22), and the connecting portion (100) comprises a second elastic body (102) connecting the first insulating portion (26) and the second insulating portion (28).

[0025] In the tenth embodiment, the coil (23) and the first insulating part (26) can be vibrated radially relative to the core (22) by a second elastic body (102) connecting the first insulating part (26) and the second insulating part (28).

[0026] An eleventh aspect of the present disclosure is a compressor comprising a rotary electric machine (20) for an air conditioning system according to any one of the first to tenth aspects.

[0027] In the eleventh embodiment, a rotating electric machine (20) for an air conditioning system is provided that can be miniaturized while suppressing vibration, thereby enabling miniaturization of the compressor and suppression of noise caused by vibration.

[0028] A twelfth aspect of the present disclosure is an air conditioning system comprising a rotating electric machine (20) for an air conditioning system according to any one of the first to tenth aspects.

[0029] In the twelfth embodiment, a rotating electric machine (20) for an air conditioning system is provided that can be miniaturized while suppressing vibration, thereby enabling the air conditioning system to be miniaturized and suppressing noise caused by vibration.

[0030] Figure 1 is a schematic diagram showing the general cross-sectional configuration of the rotating electrical machine for an air conditioning system according to Embodiment 1. Figure 2 is a perspective view of the stator in the rotating electrical machine for an air conditioning system according to Embodiment 1. Figure 3 is a schematic diagram showing the general longitudinal cross-sectional configuration of the structure in which the first insulating part and the core are connected in the rotating electrical machine for an air conditioning system according to Embodiment 1. Figure 4 is a schematic diagram showing how the coil and the first insulating part vibrate radially relative to the core in the structure shown in Figure 3. Figure 5A is a perspective view showing the connection part of Embodiment 1. Figure 5B is an enlarged perspective view of the connection part shown in Figure 5A. Figure 6 is a diagram showing the relationship between frequency and vibration in the rotating electrical machine for an air conditioning system according to Embodiment 1. Figure 7 is a longitudinal cross-sectional view showing a modified example of the connection part of Embodiment 1. Figure 8A is a longitudinal cross-sectional view showing a modified example of the connection part of Embodiment 1. Figure 8B is a longitudinal cross-sectional view showing a modified example of the connection part of Embodiment 1. Figure 8C is a longitudinal cross-sectional view showing a modified example of the connection part of Embodiment 1. Figure 8D is a longitudinal cross-sectional view showing a modified example of the connection part of Embodiment 1. Figure 8E is a longitudinal cross-sectional view showing a modified example of the connection part of Embodiment 1. Figure 8F is a longitudinal cross-sectional view showing a modified example of the connection portion of Embodiment 1. Figure 9A is a longitudinal cross-sectional view showing a modified example of the connection portion of Embodiment 1. Figure 9B is a longitudinal cross-sectional view showing a modified example of the connection portion of Embodiment 1. Figure 9C is a longitudinal cross-sectional view showing a modified example of the connection portion of Embodiment 1. Figure 9D is a perspective view showing an example of a core to which the connection portion of Embodiment 1 is connected. Figure 9E is a perspective view showing another example of a core to which the connection portion of Embodiment 1 is connected. Figure 10A is a longitudinal cross-sectional view showing a modified example of the connection portion of Embodiment 1. Figure 10B is a longitudinal cross-sectional view showing a modified example of the connection portion of Embodiment 1. Figure 10C is a plan view from the axial direction showing a modified example of the connection portion of Embodiment 1. Figure 10D is a longitudinal cross-sectional view showing a modified example of the connection portion of Embodiment 1. Figure 10E is a longitudinal cross-sectional view showing a modified example of the connection portion of Embodiment 1. Figure 10F is a longitudinal cross-sectional view showing a modified example of the connection portion of Embodiment 1. Figure 11A is a longitudinal cross-sectional view showing an example of the first insulating portion of Embodiment 1. Figure 11B is a longitudinal cross-sectional view showing another example of the first insulating portion of Embodiment 1. Figure 11C is a longitudinal cross-sectional view showing a modified example of the connection between the first insulating part and the core shown in Figure 11B. Figure 11D is a transverse cross-sectional view showing a modified example of the connection between the first insulating part and the core shown in Figure 11B.Figure 12 is a longitudinal cross-sectional view showing an example of the configuration of the compressor in Embodiment 2. Figure 13 is a piping diagram showing an example of the configuration of the air conditioning system in Embodiment 3.

[0031] 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.

[0032] (Embodiment 1) <Motor> The motor (20) of Embodiment 1 is an example of a rotating electric machine (20) for an air conditioning system.

[0033] As shown in Figure 1, the motor (20) has a stator (21) and a rotor (31). 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 located radially outward of the stator (21). The rotor (31) is configured to rotate together with the drive shaft (40). The rotor (31) rotates around the axis of the drive shaft (40) (hereinafter referred to as the rotation axis (O)).

[0034] In this disclosure, the direction in which the axis of rotation (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 axis of rotation (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."

[0035] The core (22) contains a soft magnetic material and, in this example, is formed by stacking a plurality of electromagnetic steel sheets (22a) in the axial direction. The core (22) may also be a powdered magnetic core. The core (22) has a cylindrical back yoke (24) and a plurality of teeth (25). The teeth (25) protrude radially inward from the inner circumferential surface of the back yoke (24). The coil (23) consists of windings (23a) wound around each tooth (25).

[0036] The configurations of the motor (20) shown in FIGS. 1 and 2 are merely examples, and the number of poles of the motor (20), the shape of the core (22), the number of arrangements of the teeth (25), etc. are not particularly limited.

[0037] As shown in FIGS. 2 and 3, the stator (21) has a first insulating portion (26) between the teeth (25) (core (22)) and the coil (23) in the axial direction. The first insulating portion (26) insulates the core (22) and the coil (23). The space between the teeth (25) and the coil (23) in the circumferential direction may be insulated using insulating paper. FIG. 3 is a schematic cross-sectional view of the cross-sectional configuration obtained by cutting the coil (23) provided on one tooth (25) together with the core (22) by a plane (S) indicated by the dashed-dotted line in FIG. 2.

[0038] In this example, the first insulating portion (26) is disposed on the upper surface and the lower surface of the teeth (25) in the axial direction, respectively. In other words, the first insulating portion (26) is disposed between the teeth (25) and the coil (23) in the axial direction, and the winding (23a) is wound around the teeth (25) with the first insulating portion (26) interposed therebetween. The first insulating portion (26) may have convex portions at both radial ends to prevent the coil (23) from falling off.

[0039] <Connection portion> As shown in FIG. 3, the stator (21) has a first elastic body (101) that connects the first insulating portion (26) and the core (22). The first elastic body (101) is an example of the connection portion (100). The connection portion (100) is formed such that the coil (23) and the first insulating portion (26) can vibrate radially with respect to the core (22).

[0040] In this example, a first insulating portion (26) disposed on the upper side in the axial direction of the teeth (25) is provided with a first elastic body (101) protruding downward in the axial direction, and a convex portion (101a) at the lower end in the axial direction of the first elastic body (101) is inserted into a concave portion (22a) at the upper end in the axial direction of the teeth (25). Also, a first insulating portion (26) disposed on the lower side in the axial direction of the teeth (25) is provided with a first elastic body (101) protruding upward in the axial direction, and a convex portion (101a) at the upper end in the axial direction of the first elastic body (101) is inserted into a concave portion (22a) at the lower end in the axial direction of the teeth (25). The first elastic body (101) may be integrally formed with the first insulating portion (26). In other words, the material of the first elastic body (101) may be the same as the material of the first insulating portion (26). In this case, the first insulating portion (26) may be, for example, polybutylene terephthalate (PBT), liquid crystal polymer (LCP), polyphenylene sulfide (PPS), or the like.

[0041] In order to make it easier for the coil (23) and the first insulating portion (26) to vibrate in the radial direction with respect to the core (22), it is preferable that the length in the radial direction of the first elastic body (101) is shorter than the length in the direction perpendicular to the radial direction and the axial direction, and it is more preferable that the length in the radial direction is about half or less of the length in the direction perpendicular to the radial direction and the axial direction. Alternatively, the direction in which the amount of deformation is large when a unit load is applied to the first elastic body (101) may be arranged in the radial direction.

[0042] When the first insulating portion (26) and the core (22) (teeth (25)) are connected by the first elastic body (101), that is, the connecting portion (100), a dynamic vibration absorber having the first insulating portion (26) and the coil (23) as a mass body, the connecting portion (100) as a spring element, and the core (22) as a vibration control object functions. Thereby, the radial vibration of the motor (20) is reduced.

[0043] Figure 4 is a schematic diagram showing an example of how annular vibration of the core (22) occurs in a pair of teeth (25) arranged opposite each other radially across the axis of rotation (O). As shown in Figure 4, by providing the first elastic body (101), the direction in which the first insulating part (26) and coil (23) vibrate radially with respect to one tooth (25) is opposite to the direction in which the first insulating part (26) and coil (23) vibrate radially with respect to the other tooth (25), thus reducing annular vibration of the core (22).

[0044] In this example, a coil (23) and a first insulating part (26) are independently arranged for each tooth (25), and the first insulating part (26) and the core (22) are separated by the first elastic body (101). Therefore, even if the winding (23a) is wound tightly around the teeth (25), the teeth (25), the first insulating part (26), and the coil (23) do not become one, so that the coil (23) and the first insulating part (26) can vibrate radially relative to the core (22).

[0045] <Example of connection design> In a dynamic vibration absorber, the theoretically optimal solution for stiffness can be calculated for a one-dimensional spring-mass system problem, and based on this calculation method, the stiffness to be applied to the connection (100) can be determined.

[0046] First, the displacement δ when a unit load F (= 1 N) is applied to the stator (21) is numerically calculated. -9 If m is the case, the macroscopic stiffness k of the stator (21) can be expressed by the following equation.

[0047] k=F / δ=1 / (1.92×10 -9 ) ≈ 5.21 × 10 9 [N / m] Note that the spring response is not linear across the entire load range, but Hooke's Law is applied in a simplified manner in the above equation.

[0048] Next, the effective mass m of the stator (21) is calculated from the natural frequency. Assuming that the natural frequency fn that excites the circular vibration (elliptical vibration) in the stator (21) is 2872 Hz by frequency response analysis, from the relational expression fn = (1 / 2π) × √(k / m), the effective mass m is: m = k / (4π 2 fn 2 ²) = (5.21 × 10 9 ²) / (4 × π 2 ² × 2872 2 ²) ≈ 1.60 [kg].

[0049] In this embodiment, since the coil (23) is used as the mass point of the dynamic vibration absorber, the added mass ma is the sum of the mass of the first insulating portion (26) and the mass of the coil (23). Here, assuming that the added mass ma is 0.134 kg, using the ratio μ of the effective mass m of the main system and the added mass ma, the optimal natural frequency ωa of the dynamic vibration absorber alone is given by the following formula.

[0050] ωa = (1 / (1 + μ)) × ωn = (1 / (1 + ma / m)) × 2πfn = (1 / (1 + 0.134 / 1.60)) × 2π × 2872 ≈ 16647 [rad. / s]. Note that in the above formula, ωn is the stator vibration frequency and ωn = 2πfn.

[0051] Thus, the optimal spring constant ka to be applied to the connection portion (100) is: ka = ma × ωa 2 = 0.134 × 16647 2 ≈ 3.71 × 10 7 [N / m].

[0052] Therefore, in this example, the parameters such as the material, shape, and arrangement position of the connection portion (100) may be determined so that the radial rigidity ka in the connection portion (100) becomes 3.71 × 10 7 [N / m]. Specifically, the displacement amount δ' when a load F' is applied to the first insulating portion (26) provided with the first elastic body (101) serving as the connection portion (100) is obtained by numerical calculation, and the parameters of the first elastic body (101) are adjusted so as to approach the optimal rigidity ka = F' / δ' = 3.71 × 10 7 [N / m].

[0053] Figures 5A and 5B show an example of a first elastic body (101) designed as described above. In the example shown in Figures 5A and 5B, two first elastic bodies (101) are provided in the first insulating part (26) for connecting to the core (22) (teeth (25)). Each first elastic body (101) extends in a direction perpendicular to the vibration direction (radial direction). That is, the radial length of each first elastic body (101) is shorter than the length in the direction perpendicular to the radial direction. A protrusion (101a) is provided in the center of each first elastic body (101) in the direction perpendicular to the radial direction, which is inserted into a recess (22a) (see Figure 3) of the core (22).

[0054] <Features of Embodiment 1> In the motor (20) of Embodiment 1 described above, the connecting part (100) that connects the first insulating part (26) and the core (22), specifically the first elastic body (101) that connects the first insulating part (26) and the teeth (25), is formed so that the coil (23) and the first insulating part (26) can vibrate radially with respect to the core (22). Therefore, since the coil (23) and the first insulating part (26) act as dynamic vibration absorbers that suppress vibration, the motor (20) can be miniaturized without providing a vibration damping structure on the outside of the stator (21).

[0055] Figure 6 shows the relationship between frequency (rotor speed) and vibration in the motor (20) of Embodiment 1, compared with a conventional motor without a connection part (100). As shown in Figure 6, the motor (20) of Embodiment 1 exhibits reduced vibration (amplitude peak) compared to a conventional motor.

[0056] In the motor (20) of Embodiment 1, the connection portion (100) has a first elastic body (101) that connects the first insulating portion (26) and the core (22). Therefore, the first elastic body (101) can cause the coil (23) and the first insulating portion (26) to vibrate radially relative to the core (22). Furthermore, the first elastic body (101) has a convex portion (101a), and the core (22) has a recess (22a) into which the convex portion (101a) is inserted. Therefore, the first elastic body (101) can be connected to the core (22) by inserting the convex portion (101a) of the first elastic body (101) into the recess (22a) of the core (22).

[0057] In the motor (20) of Embodiment 1, the radial length of the first elastic body (101) is shorter than the length in the direction perpendicular to the radial direction, so the first elastic body (101) makes it easier to vibrate the coil (23) and the first insulating part (26) radially relative to the core (22).

[0058] In the motor (20) of Embodiment 1, the material of the first elastic body (101) is the same as the material of the first insulating part (26), so the first elastic body (101) can be formed integrally with the first insulating part (26). This facilitates the connection between the first insulating part (26) and the core (22).

[0059] (Modification of Embodiment 1) In Embodiment 1, the first elastic body (101) shown in Figure 3 was used as an example of the connecting portion (100). However, the material, shape, and position of the connecting portion (100) are not particularly limited, as long as the coil (23) and the first insulating portion (26) can be vibrated radially relative to the core (22).

[0060] For example, as shown in Figure 7, the first elastic body (101) may be formed in multiple locations (two in this example) in the radial direction. Also, the first insulating portion (26) may be in partial contact with the core (22). For example, both radial ends of the first insulating portion (26) may be in contact with the teeth (25). Note that in Figure 7, the same reference numerals are used for the same components as in Figure 3.

[0061] In the above embodiment 1, the material of the first elastic body (101) is the same as the material of the first insulating part (26), but the material of the first elastic body (101) may be different from the material of the first insulating part (26). This makes it possible to increase the rigidity of the first elastic body (101). In this case, as the first elastic body (101), for example, a leaf spring made of a metal with a higher Young's modulus than resin may be used. Alternatively, and without limiting thereto, resin (PBT, LCP, PPS, etc.) may be used as the first insulating part (26), and a different resin, rubber, or metal may be used as the first elastic body (101). In this case, the material of the convex part (101a) and the material of other parts of the first elastic body (101) may be different.

[0062] Furthermore, if it is desired to increase the rigidity of the first elastic body (101), which is made of the same material as the first insulating part (26), the number of first elastic bodies (101) installed or the radial width may be increased so as to increase the cross-sectional area of ​​the first elastic body (101) in the direction of deformation.

[0063] Figure 8A shows the case where the first elastic body (101) shown in Figure 7 is made of a different material from the first insulating part (26), and Figures 8B to 8F show modified examples of the first elastic body (101) shown in Figure 8A. In Figures 8A to 8F, the same components as in Figure 7 are denoted by the same reference numerals. In the first elastic body (101) shown in Figures 8A to 8F, the material of the convex part (101a) is different from the material of the other parts.

[0064] More specifically, Figure 8B shows the case where the radial widths of the two first elastic bodies (101) are different. Figures 8C and 8D show the case where only one first elastic body (101) is provided, and the first elastic body (101) shown in Figure 8D has a tapered shape such that its radial width narrows as it approaches the teeth (25). This improves the moldability of the first elastic body (101). Figure 8E shows the case where three first elastic bodies (101) are provided. Figure 8F shows the case where the mounting surface of the first elastic body (101) in the first insulating part (26) is flat.

[0065] Furthermore, even if the material of the first elastic body (101) is the same as the material of the first insulating part (26), the shape and number of the first elastic body (101) may be as shown in Figures 8B to 8F.

[0066] In the above embodiment 1, the first elastic body (101) was connected to the core (22) by inserting the convex portion (101a) of the first elastic body (101) into the concave portion (22a) of the core (22). However, instead, as shown in Figure 9A or Figure 9B, the first elastic body (101) may be connected to the core (22) using a crimping portion (27) that fixes the laminated steel plates constituting the core (22). Specifically, Figure 9A shows the case where a single crimp is used as the crimping portion (27), and Figure 9B shows the case where a V-crimp is used as the crimping portion (27). When connecting the first elastic body (101) to the core (22) using the crimping portion (27), if it is desired to increase the rigidity of the first elastic body (101), the radial width and / or the width perpendicular to the radial direction of the mating portion between the crimping portion (27) and the first elastic body (101) can be increased.

[0067] Alternatively, as shown in Figure 9C, a retaining portion (101b) that caps the teeth (25) radially may be provided at the end of the first elastic body (101) to connect the first elastic body (101) to the core (22).

[0068] In the above embodiment 1, as shown in Figures 3 and 9D, the convex portion (101a) of the first elastic body (101) was inserted into the recess (22a), which is a hole (recess) provided on the axial end face of the tooth (25). However, instead, as shown in Figure 9E, the recess (22a) may be formed by cutting out the circumferential end of the tooth (25). In this case, the convex portion (101a) to be inserted into the recess (22a) is provided on the first elastic body (101).

[0069] In the above embodiment 1, as shown in Figure 3, the axial end face of the first insulating part (26) and the axial end face of the teeth (25) are connected by the first elastic body (101). However, instead, as shown in Figure 10A, the radial end face (outer diameter side) of the first insulating part (26) and the axial end face of the back yoke (24) may be connected by the first elastic body (101). In this case, the first elastic body (101) may have a bent spring structure. In Figure 10A, the same components as in Figure 3 are denoted by the same reference numerals.

[0070] Alternatively, as shown in Figures 10B and 10C, a second insulating part (28) fixed to the core (22) may be placed on the axially outer side of the back yoke (24) in the stator (21), and a second elastic body (102) connecting the first insulating part (26) and the second insulating part (28) may be provided as a connecting part (100). In this way, the first insulating part (26) and the core (22) are connected via the second elastic body (102) and the second insulating part (28). The second elastic body (102) is formed so that the coil (23) and the first insulating part (26) can vibrate radially relative to the core (22). In Figures 10B and 10C, the same components as in Figure 3 are denoted by the same reference numerals.

[0071] The second elastic body (102) may have a bent spring structure. Figure 10C illustrates a case where the shape of the spring structure that becomes the second elastic body (102) is rhombic when viewed from the axial direction, but it is not limited to this, and may be annular, jagged, or corrugated. The material of the second elastic body (102) may be the same as the first elastic body (101), such as resin, rubber, or metal. If the rigidity of the second elastic body (102) is to be increased, a material with a high Young's modulus may be used, or the dimensions of the second elastic body (102) may be increased.

[0072] If a second elastic body (102) is provided, the first elastic body (101) does not need to be provided. In this case, as shown in Figure 10B, a contact portion (26a) that makes point contact with the axial end face of the teeth (25) may be provided on the axial end face of the first insulating portion (26). Alternatively, as shown in Figure 10D, both the first elastic body (101) and the second elastic body (102) may be provided. This increases the effect of suppressing vibration. In Figure 10D, the same reference numerals are used for the same components as in Figure 3, and the structure of the first elastic body (101) is shown in a simplified manner.

[0073] When both a first elastic body (101) and a second elastic body (102) are provided, and the materials of the first elastic body (101) and the second elastic body (102) are different from the material of the first insulating part (26), in particular when metal is used as the material for the first elastic body (101) and the second elastic body (102), the first elastic body (101) and the second elastic body (102) may be formed by insert molding of metal. In this case, as shown in Figure 10E, the first elastic body (101) and the second elastic body (102) may be insert molded separately, or as shown in Figure 10F, the first elastic body (101) and the second elastic body (102) may be insert molded as a single unit.

[0074] Figures 11A and 11B are schematic diagrams showing the configuration of a cross-section perpendicular to the cross-section shown in Figure 3. In Figures 11A and 11B, the same reference numerals are used for the same components as in Figure 3, and the structure of the first elastic body (101) is shown in a simplified manner.

[0075] As shown in Figure 11A, the space between the teeth (25) and the coil (23) in the circumferential direction may be insulated using insulating paper (29). The insulating paper (29) may be positioned to straddle the circumferential ends of the first insulating portion (26) which is positioned above and below the teeth (25) in the axial direction.

[0076] Alternatively, as shown in Figure 11B, a first insulating portion (26) may be provided not only between the teeth (25) and the coil (23) in the axial direction, but also between the teeth (25) and the coil (23) in the circumferential direction. That is, the first insulating portion (26) shown in Figure 11B is an integral part of the insulating paper (29) shown in Figure 11A. In this case, the first elastic body (101) which serves as the connecting portion (100) may also be formed integrally with the first insulating portion (26).

[0077] The insulating paper (29) shown in Figure 11A or the first insulating part (26) shown in Figure 11B can prevent the coil (23) from coming into contact with the circumferential side surface of the teeth (25). Here, if a gap is provided between the insulating paper (29) shown in Figure 11A or the first insulating part (26) shown in Figure 11B and the circumferential side surface of the teeth (25), the coil (23) will be able to move more easily radially relative to the core (22). Therefore, the width of the first insulating parts (26) positioned above and below the teeth (25) in the axial direction may be made larger than the width of the teeth (25) in the direction perpendicular to the radial direction.

[0078] As a modification of the case shown in Figure 11B, a first elastic body (101) may be additionally formed to connect the first insulating portion (26) and the circumferential side surface of the teeth (25), as shown in Figures 11C and 11D. In other words, the first elastic body (101) may also be provided in the slot where the coil (23) is arranged. In Figures 11C and 11D, the same reference numerals are used for the same components as in Figure 11B. Figure 11D shows the configuration of a cross-section perpendicular to the cross-section shown in Figure 11C.

[0079] The first insulating portion (26) shown in Figures 11C and 11D may be divided into two parts near the axial center, and each divided piece may be fitted over the teeth (25) from above and below in the axial direction to integrate them. This makes it easier to form the first elastic body (101) that connects the first insulating portion (26) and the circumferential side surface of the teeth (25). In this case, as shown in Figure 11D, a notch may be provided on the circumferential side surface of the teeth (25) to accommodate the first elastic body (101).

[0080] (Embodiment 2) As shown in Figure 12, 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 directions when the compressor (10) is viewed from the front (see arrows in Figure 12). "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)).

[0081] 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.

[0082] 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 circumferential surface of the body (12). The rotor (31) of the motor (20) rotates about 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).

[0083] 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 circumferential surface of the cylinder (51) and the outer circumferential surface of the piston (52). In the cylinder chamber (53), the piston (52), driven by the drive shaft (40), compresses the fluid.

[0084] 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).

[0085] As described in Embodiment 1, the compressor (10) of Embodiment 2 can be miniaturized because it is possible to miniaturize the motor (20) which has a mechanism that can suppress vibration. This allows for miniaturization of the compressor (10) and suppression of noise caused by vibration.

[0086] Note that the configuration of the compressor (10) shown in Figure 12 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.

[0087] (Embodiment 3) As shown in Figure 13, the air conditioning system (1) of Embodiment 3 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 conditioning system (1) may also be an air conditioning system that switches between cooling and heating. In this case, the air conditioning system (1) further has a switching mechanism (e.g., a four-way switching valve) for switching the direction of refrigerant circulation. Alternatively, the air conditioning system (1) of Embodiment 3 may be for cooling only or for heating only.

[0088] 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 13).

[0089] 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).

[0090] The air conditioning system (1) of Embodiment 3 has a compressor (10) of Embodiment 2 equipped with the motor (20) of Embodiment 1, so it can be made smaller and noise caused by vibration can be suppressed.

[0091] Note that the air conditioning system (1) shown in Figure 13 is illustrative, and the configuration of the air conditioning system (1) is not particularly limited. In addition, in Embodiment 3, the motor (20) of Embodiment 1 was used as the motor to drive the compressor (10), but in addition to this, or instead, the motor (20) may be used as the motor (M1) to drive the first blower (BL1) and / or the motor (M2) to drive the second blower (BL2).

[0092] (Other Embodiments) In the above embodiments (including modified examples), a motor (20) was described as a rotating electric machine for an air conditioning system, but a configuration similar to that of the motor (20) may also be applied to a generator.

[0093] 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.

[0094] As described above, this disclosure is useful for rotary electromachines, compressors, and air conditioning systems for air conditioning equipment.

[0095] 1 Air conditioning unit 10 Compressor 20 Motor (rotating electrical machine for air conditioning unit) 21 Stator 22 Core 22a Recess 23 Coil 23a Winding 24 Back yoke 25 Teeth 26 First insulating part 27 Crimped part 28 Second insulating part 31 Rotor 100 Connection part 101 First elastic body 101a Protrusion 102 Second elastic body O Rotation axis

Claims

1. A rotary electric machine (20) for an air conditioning system comprising a rotor (31) that rotates around a rotation axis (O) and a stator (21) arranged radially outward from the rotor (31), wherein the stator (21) has: a core (22) including a cylindrical back yoke (24) and a plurality of teeth (25) protruding radially inward from the back yoke (24); a coil (23) consisting of windings (23a) wound around each of the teeth (25); a first insulating portion (26) provided between the core (22) and the coil (23) to insulate the core (22) and the coil (23); and a connecting portion (100) connecting the first insulating portion (26) and the core (22), wherein the connecting portion (100) is formed so that the coil (23) and the first insulating portion (26) can vibrate radially with respect to the core (22). Rotating electrical machinery for air conditioning systems.

2. The rotary electric machine (20) for an air conditioning system according to claim 1, wherein the connecting portion (100) has a first elastic body (101) that connects the first insulating portion (26) and the core (22).

3. A rotary electric machine (20) for an air conditioning system according to claim 2, wherein the first elastic body (101) has a protrusion (101a), and the core (22) has a recess (22a) into which the protrusion (101a) is inserted.

4. A rotary electric machine (20) for an air conditioning system according to claim 2, wherein the core (22) is made of laminated steel plates and has a crimping portion (27) for fixing the steel plates together, and the first elastic body (101) is connected to the crimping portion (27), the rotary electric machine for an air conditioning system.

5. A rotary electric machine (20) for an air conditioning system according to any one of claims 2 to 4, wherein the radial length of the first elastic body (101) is shorter than the length in the direction perpendicular to the radial direction.

6. A rotary electric machine (20) for an air conditioning system according to any one of claims 2 to 5, wherein the material of the first elastic body (101) is the same as the material of the first insulating part (26).

7. A rotary electric machine (20) for an air conditioning system according to claim 6, wherein the first elastic body (101) is formed integrally with the first insulating part (26).

8. A rotating electric machine (20) for an air conditioning system according to any one of claims 2 to 5, wherein the material of the first elastic body (101) is different from the material of the first insulating part (26).

9. A rotary electric machine (20) for an air conditioning system according to any one of claims 1 to 8, wherein the first insulating part (26) is arranged between the teeth (25) and the coil (23) in the axial direction, and between the teeth (25) and the coil (23) in the circumferential direction.

10. A rotary electric machine (20) for an air conditioning system according to any one of claims 1 to 9, wherein the stator (21) is located axially outside the back yoke (24) and comprises a second insulating portion (28) fixed to the core (22), and the connecting portion (100) comprises a second elastic body (102) connecting the first insulating portion (26) and the second insulating portion (28).

11. A compressor comprising a rotary electric machine (20) for an air conditioning system according to any one of claims 1 to 10.

12. An air conditioning system comprising a rotary electric machine (20) for an air conditioning system according to any one of claims 1 to 10.

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