JP7787442B2 - Stator core, rotating electric machine, compressor, and refrigeration device - Google Patents

Description

This disclosure relates to a stator core, a rotating electric machine, a compressor, and a refrigeration device.

A stator core for a rotating electric machine that is supported by a casing is known. In one example, the stator core for a rotating electric machine is supported within the body of the casing. Patent Document 1 discloses an example of such a rotating electric machine.

JP 2009-261162 A

One method of fixing the stator core to the casing is shrink fitting. When the stator core is fixed in this way, compressive stress occurs in the yoke portion of the stator core. When compressive stress occurs in the yoke portion, there is a risk of iron loss due to magnetic degradation.

A first aspect of the stator core that solves this problem is a stator core for a rotating electrical machine that is supported within a cylindrical body of a casing, and includes: a cylindrical yoke portion provided inside the body; a plurality of support portions that are provided radially outward of the yoke portion and aligned circumferentially of the yoke portion to support the yoke portion on the body; a first connection portion that connects the yoke portion to one end of the support portion in the circumferential direction; and a second connection portion that connects the yoke portion to the other end of the support portion in the circumferential direction, wherein each of the first connection portion and the second connection portion includes a first portion and a second portion that extend radially inward from the support portion between the connection portion with the support portion and the connection portion with the yoke portion, and the inner end of the second portion in the radial direction is directly or indirectly connected to the inner end of the first portion in the radial direction, and the outer end of the second portion in the radial direction is spaced apart from the first portion in the circumferential direction.

With this configuration, the outer end of the second portion in the radial direction is positioned away from the first portion in the circumferential direction. In other words, there is a gap between the outer ends of the first portion and the second portion in the circumferential direction. This gap allows the second portion to move relative to the first portion. This allows the first and second connection portions to deform. The deformation of the first and second connection portions makes it less likely that compressive stress will occur in the yoke portion. This makes it less likely that iron loss will occur due to magnetic degradation.

A stator core of a second aspect is the stator core of the first aspect, wherein each of the first connection portion and the second connection portion further includes a third portion between the connection portion with the support portion and the connection portion with the yoke portion, and the outer end of the third portion in the radial direction is directly or indirectly connected to the outer end of the second portion in the radial direction, and the inner end of the third portion in the radial direction is positioned away from both the first portion and the second portion in the circumferential direction.

With this configuration, the inner end of the third portion in the radial direction is positioned away from the second portion in the circumferential direction. In other words, there is a gap between the inner ends of the second portion and the third portion in the circumferential direction. This gap allows the third portion to move relative to the second portion. This allows the first connecting portion and the second connecting portion to deform more appropriately.

A third aspect of the stator core is the stator core of the first or second aspect, wherein the second portion is disposed between adjacent support portions in the circumferential direction.

With this configuration, the second portion is positioned between adjacent support portions, allowing the portion of the yoke portion located radially inward of the support portions to be enlarged.

The stator core of the fourth aspect is the stator core of any one of the first to third aspects, wherein the second portion is positioned inward of the support portion in the radial direction.

With this configuration, a support portion can be provided radially outside the second portion, allowing the yoke portion to be properly supported on the fuselage.

A stator core according to a fifth aspect is the stator core according to the third aspect, wherein the length of the first connection portion in the circumferential direction is equal to or less than half the length of the support portion in the circumferential direction, and the length of the second connection portion in the circumferential direction is equal to or less than half the length of the support portion in the circumferential direction.

With this configuration, the circumferential length of the support portion can be made greater than or equal to the combined length of the first connection portion and the second connection portion. This allows the portion of the yoke portion located in the inner region inside the support portion to be larger.

A sixth aspect of the stator core is the stator core of any one of the first to fifth aspects, wherein a first surface portion is formed at the outer end of the first portion in the radial direction, facing the second portion; a second surface portion is formed at the outer end of the second portion in the radial direction, spaced apart from the first surface portion in the circumferential direction and facing the first surface portion; the length from the inner end to the outer end of the first surface portion in the radial direction is longer than the length between the first surface portion and the second surface portion; and the length from the inner end to the outer end of the second surface portion in the radial direction is longer than the length between the first surface portion and the second surface portion.

With this configuration, the length from the inner end to the outer end of the gap between the outer ends of the first and second parts in the circumferential direction is longer than the length between the first and second surfaces, allowing the second part to move favorably relative to the first part.

A seventh aspect of the stator core is the stator core of any one of the first to sixth aspects, further comprising a plurality of teeth extending radially inward from the yoke portion, and each of the first connection portion and the second connection portion is positioned radially outward from the teeth.

In the yoke portion, magnetic paths are less likely to form in the radially outer portions of the teeth. With this configuration, the first and second connection portions are provided in areas of the stator core where magnetic paths are less likely to form. This prevents the magnetic paths from being reduced by providing the first and second connection portions.

The stator core of an eighth aspect is the stator core of the seventh aspect, wherein the first connection portion is arranged on the outer side of each of the plurality of teeth in the radial direction, and the second connection portion is arranged on the outer side of each of the plurality of teeth in the radial direction.

This configuration makes it possible to increase the number of first and second connection parts while minimizing the reduction in magnetic path caused by providing the first and second connection parts. This allows for an increase in the number of support parts, thereby improving the support force of the yoke part provided by the support parts.

A stator core according to a ninth aspect is the stator core according to the seventh or eighth aspect, wherein the length of the first connection portion in the circumferential direction is equal to or less than the length of the tooth portion in the circumferential direction, and the length of the second connection portion in the circumferential direction is equal to or less than the length of the tooth portion in the circumferential direction.

With this configuration, the circumferential length of each of the first and second connection portions is equal to or less than the circumferential length of the tooth portion, allowing the first or second connection portion to be suitably positioned on the outer side of the tooth portion.

A stator core according to a tenth aspect is the stator core according to any one of the first to ninth aspects, further comprising a plurality of teeth extending radially inward from the yoke portion, and a plurality of slots surrounded by adjacent teeth in the circumferential direction and a portion of the yoke portion, wherein each of the plurality of support portions is disposed outside each of the plurality of slots in the radial direction, and the number of support portions is the same as the number of slots.

With this configuration, the support parts are located radially outward of the slots. This reduces compressive stress in the part of the yoke where the magnetic path is formed, compared to when the number of support parts is fewer than the number of slots.

The stator core of an eleventh aspect is the stator core of any one of the first to tenth aspects, with three of the support portions aligned in the circumferential direction.

With this configuration, the yoke section can be fixed inside the cylindrical body of the casing using three support sections.

The stator core of the twelfth aspect is the stator core of any one of the first to eleventh aspects, wherein the support portion is fixed in contact with the inner circumferential surface of the body.

This configuration allows the stator core to be securely fixed inside the casing by friction.

A rotating electric machine according to a thirteenth aspect includes the stator core according to any one of the first to twelfth aspects.

With this configuration, the stator core has a structure that reduces compressive stress from the casing, resulting in less iron loss due to magnetic degradation in the rotating electric machine. This allows for higher efficiency in the rotating electric machine compared to rotating electric machines with conventional stator cores.

A compressor according to a fourteenth aspect includes the rotating electric machine according to the thirteenth aspect.

With this configuration, the compressor's rotating electrical machine has high efficiency, which increases the compressor's energy efficiency.

A refrigeration device according to a fifteenth aspect includes the compressor according to the fourteenth aspect.

With this configuration, the refrigeration system is constructed with a highly energy-efficient compressor, reducing power consumption.

1 is a schematic configuration diagram of a refrigeration device according to an embodiment. FIG. 1 is a cross-sectional view of a compressor according to an embodiment. FIG. 2 is a plan view of a stator core according to the embodiment. 4 is an enlarged schematic view showing the vicinity of a support portion, a first connection portion, and a second connection portion of the stator core of FIG. 3. FIG. 4 is an enlarged schematic view showing the vicinity of a first connecting portion and a second connecting portion of the stator core of FIG. 3. FIG. FIG. 10 is a plan view of a stator core according to a first modified example. FIG. 10 is a plan view of a stator core according to a second modified example. 10 is a schematic diagram of a support portion, a first connection portion, and a second connection portion of a stator core according to a third modified example. FIG. 10 is a schematic diagram of a support portion, a first connection portion, and a second connection portion of a stator core according to a fourth modified example. FIG. 10 is a schematic diagram of a support portion, a first connection portion, and a second connection portion of a stator core according to a fifth modified example. FIG. 13 is a schematic diagram of a support portion, a first connection portion, and a second connection portion of a stator core according to a sixth modified example. FIG. 13 is a schematic diagram of a support portion, a first connection portion, and a second connection portion of a stator core according to a seventh modified example. FIG. FIG. 13 is a schematic diagram of a support portion, a first connection portion, and a second connection portion of a stator core according to an eighth modified example. 13 is a schematic diagram of a support portion, a first connection portion, and a second connection portion of a stator core according to a ninth modified example. FIG. FIG. 20 is a schematic diagram of a first connecting portion and a second connecting portion of a stator core according to a tenth modified example. FIG. 23 is a schematic diagram of a first connecting portion and a second connecting portion of a stator core according to an eleventh modified example.

<Embodiment>
1 to 5 , a refrigeration system 1, a compressor 10, a rotating electric machine 100, and a stator core 200 according to an embodiment will be described. In the following description, unless otherwise specified, the terms "axial direction,""circumferentialdirection," and "radial direction" refer to the axial direction, circumferential direction, and radial direction, respectively, relative to the central axis CA of the yoke portion 210.

<Refrigeration equipment>
1 and 2 , the refrigeration system 1 includes a refrigerant circuit R. The refrigerant circuit R performs a vapor compression refrigeration cycle. The refrigeration system 1 includes a compressor 10. The compressor 10 is provided in the refrigerant circuit R of the refrigeration system 1. In addition to the compressor 10, the refrigerant circuit R is also provided with a radiator 23, a pressure reduction mechanism 24 configured with an expansion valve, and an evaporator 25.

Figure 2 shows an axial cross-sectional view of the compressor 10. In one example, the compressor 10 is a rotary compressor. In one example, the compressor 10 is a swing piston compressor. The compressor 10 may also be a scroll, screw, or turbo compressor.

The compressor 10 includes a rotating electric machine 100. The rotating electric machine 100 functions as the motor of the compressor 10. The compressor 10 further includes a drive shaft 11, a compression mechanism 12, and a casing 13.

The casing 13 houses the rotating electric machine 100, the drive shaft 11, and the compression mechanism 12. The casing 13 is a completely sealed container. The interior of the casing 13 is filled with high-pressure refrigerant discharged from the compression mechanism 12. The casing 13 is made of a metal material.

The casing 13 has a body 14, a bottom 15, and a top 16. The body 14 is a cylindrical member. An opening is formed at each end of the body 14 in the axial direction. In the example of Figure 2, the axial direction corresponds to the vertical direction. The bottom 15 closes the opening on the lower side of the body 14. The top 16 closes the opening on the upper side of the body 14.

The drive shaft 11 is arranged in the casing 13 along the axial direction. The drive shaft 11 rotates around the central axis CA. One end of the drive shaft 11 is rotatably supported by a bearing 17. The other end of the drive shaft 11 is fixed to the rotor core 400 of the rotating electric machine 100.

The compression mechanism 12 has a cylinder 18 and a piston 19. The piston 19 is connected to the drive shaft 11 and is located inside the cylinder 18. A cylinder chamber 20 is formed between the inner periphery of the cylinder 18 and the outer periphery of the piston 19.

The compressor 10 has a suction pipe 21 and a discharge pipe 22. The suction pipe 21 is connected to the cylinder chamber 20 of the compression mechanism 12. The discharge pipe 22 is connected to the internal space of the casing 13.

Low-pressure refrigerant from the refrigerant circuit R is drawn into the cylinder chamber 20 of the compression mechanism 12 via the suction pipe 21. The compression mechanism 12 compresses the refrigerant in the cylinder chamber 20 using a piston 19 driven by the drive shaft 11. The interior of the casing 13 is filled with high-pressure refrigerant discharged from the compression mechanism 12. This high-pressure refrigerant flows through the rotating electric machine 100 and is then discharged into the refrigerant circuit R via the discharge pipe 22.

<Rotating electric machines>
Please refer to Fig. 3. In one example, the rotating electric machine 100 is configured as an embedded magnet motor. In one example, the rotating electric machine 100 is an inner rotor motor. The rotating electric machine 100 is disposed within a body 14 of a casing 13. The rotating electric machine 100 includes a stator core 200. Fig. 3 shows a plan view of the stator core 200 as viewed from the axial direction. Fig. 3 shows the casing 13 and the stator core 200 disposed within the body 14.

The stator core 200 is supported within the cylindrical body 14 of the casing 13. The stator core 200 is fitted into the body 14 of the casing 13. Examples of methods for supporting the stator core 200 within the body 14 include shrink fitting, cold fitting, and press fitting. The stator core 200 is composed of multiple stator core plates stacked in the axial direction. In one example, the stator core plates are formed from pressed electromagnetic steel sheets.

The stator core 200 includes a yoke portion 210. The yoke portion 210 is provided inside the body 14. Here, "inward" refers to the direction radially toward the central axis CA when viewed from the axial direction. Furthermore, "outward," which will be described later, refers to the direction radially away from the central axis CA when viewed from the axial direction. The yoke portion 210 is configured in a tubular shape. The yoke portion 210 is configured, for example, in a cylindrical shape. The outer peripheral surface 210S of the cylinder of the yoke portion 210 may be provided with irregularities corresponding to the shapes of the support portion 240, first connection portion 250, and second connection portion 260, which will be described later.

The stator core 200 further includes a plurality of teeth 220 and a plurality of slots 230. The teeth 220 extend radially inward from the yoke portion 210. Here, "radially inward" refers to an area closer to the central axis CA than the object when viewed axially. Furthermore, "radially outward," which will be described later, refers to an area farther from the central axis CA than the object when viewed axially. The multiple teeth 220 are aligned in the circumferential direction. In this embodiment, the stator core 200 includes nine teeth 220.

The slots 230 are surrounded by adjacent teeth 220 in the circumferential direction and a portion of the yoke 210. The number of slots 230 is the same as the number of teeth 220.

Refer to Figures 2 and 3. The rotating electric machine 100 further includes a winding 300 and a rotor core 400. The winding 300 is wound around each of the multiple tooth portions 220. The rotor core 400 is disposed radially inside the stator core 200. The rotational axis of the rotor core 400 is coaxial with the central axis CA.

When electricity flows through the windings 300, the stator core 200 generates a magnetic field that rotates the rotor core 400 around the central axis CA. In the stator core 200, a magnetic path is formed in the yoke portion 210 and the teeth portion 220.

<Configuration of stator core>
3 , the stator core 200 includes a yoke portion 210, a plurality of support portions 240, first connection portions 250, and second connection portions 260. One first connection portion 250 and one second connection portion 260 are connected to one support portion 240. The first connection portion 250 and the second connection portion 260 that connects to the same support portion 240 as the first connection portion 250 are configured to be symmetrical with respect to a center line that passes through a midpoint of the support portion 240 in the circumferential direction in the radial direction.

<Support part>
The support portion 240 is provided radially outward from the yoke portion 210. The multiple support portions 240 are provided lined up in the circumferential direction. The multiple support portions 240 support the yoke portion 210 on the body 14. The support portions 240 are configured to extend in the circumferential direction. Because the support portions 240 are located between the yoke portion 210 and the body 14, the yoke portion 210 does not contact the body 14. The thickness of the support portions 240 in the radial direction is smaller than that of the yoke portion 210 in the radial direction.

The support portion 240 is fixed, for example, in contact with the inner circumferential surface 14S of the body 14. By fixing the support portion 240 to the inner circumferential surface 14S of the body 14, the yoke portion 210 is supported by the body 14. In this way, the stator core 200 is supported within the body 14, and the rotating electric machine 100 is supported within the body 14 of the casing 13.

The stator core 200 of this embodiment has nine support portions 240. In this embodiment, the number of support portions 240 is the same as the number of slots 230. Each of the multiple support portions 240 is disposed radially outward of each of the multiple slots 230. The region located inward of the support portions 240 is defined as the inner region. At least a portion of the slots 230 is located in the inner region.

See Figure 4. The inner peripheral surface 240S of the support portion 240 is radially spaced from the outer peripheral surface 210S of the yoke portion 210. The radial distance D1 from the inner peripheral surface 240S of the support portion 240 to the outer peripheral surface 210S of the yoke portion 210 is 0.5 mm or more and 1.0 mm or less. When the distance D1 is 0.5 mm or more, even if the support portion 240 deforms radially inward due to compressive stress, the inner peripheral surface 240S of the support portion 240 is less likely to come into contact with the outer peripheral surface 210S of the yoke portion 210. When the distance D1 is 1.0 mm or less, the thickness of the yoke portion 210 in the radial direction can be suitably increased.

<First Connection Portion and Second Connection Portion>
4 , the first connecting portion 250 connects the yoke portion 210 to one end 241 of the support portion 240 in the circumferential direction. The second connecting portion 260 connects the yoke portion 210 to the other end 242 of the support portion 240 in the circumferential direction. The yoke portion 210 is connected to the support portion 240 by the first connecting portion 250 and the second connecting portion 260, so that the yoke portion 210 is supported within the fuselage 14.

Each of the first connection portion 250 and the second connection portion 260 includes at least one bent portion between the connection portion with the support portion 240 and the connection portion with the yoke portion 210. The bent portion is composed of two or more portions that extend in different directions. If compressive stress occurs in the stator core 200 during the manufacture of the rotating electric machine 100, causing the support portion 240 to move relative to the yoke portion 210, this relative movement is permitted by deformation around the bent portions of the first connection portion 250 and the second connection portion 260.

Each of the first connecting portions 250 and the second connecting portions 260 is arranged radially outward from the tooth portions 220. In this embodiment, the number of first connecting portions 250 is the same as the number of tooth portions 220. The number of second connecting portions 260 is the same as the number of tooth portions 220. The first connecting portions 250 are arranged radially outward from each of the multiple tooth portions 220. The second connecting portions 260 are arranged radially outward from each of the multiple tooth portions 220. In one example, a portion of the first connecting portions 250 and a portion of the second connecting portions 260 are arranged radially outward from the tooth portions 220.

Refer to Figure 5. Each of the first connection portion 250 and the second connection portion 260 includes a first portion 270 and a second portion 280 between the connection portion with the support portion 240 and the connection portion with the yoke portion 210. The first portion 270 and the second portion 280 form a single bent portion. Each of the first connection portion 250 and the second connection portion 260 further includes a third portion 290 between the connection portion with the support portion 240 and the connection portion with the yoke portion 210. The second portion 280 and the third portion 290 form a single bent portion. Therefore, in this embodiment, each of the first connection portion 250 and the second connection portion 260 has two bent portions. The first portion 270, second portion 280, and third portion 290 are arranged in this order between the connection portion with the support portion 240 and the connection portion with the yoke portion 210.

The first portion 270 is connected to the support portion 240. The first portion 270 is disposed between the body 14 of the casing 13 and the yoke portion 210. The first portion 270 is disposed away from the body 14 of the casing 13. The first portion 270 is disposed away from the yoke portion 210.

The first portion 270 extends radially inward from the support portion 240. At the first connection portion 250, the outer end portion 271 of the first portion 270 in the radial direction may include the end portion 241 of the support portion 240. At the second connection portion 260, the outer end portion 271 of the first portion 270 in the radial direction may include the end portion 242 of the support portion 240. The outer end portion 271 of the first portion 270 in the radial direction connects to the support portion 240 in the circumferential direction. The inner end portion 272 of the first portion 270 in the radial direction is positioned away from the support portion 240 in the circumferential direction. The support portion 240 and the first portion 270 may form a single bent portion.

The first portion 270 is disposed between adjacent support portions 240 in the circumferential direction. As long as the first portion 270 is disposed between adjacent support portions 240 in the circumferential direction, the first portion 270 may be disposed radially inward of the support portions 240. The radially outer end 271 of the first portion 270 is disposed away from the body 14 of the casing 13. The radially inner end 272 of the first portion 270 is disposed away from the yoke portion 210.

A first surface portion 273 is formed at the radially outer end portion 271 of the first portion 270. The first surface portion 273 faces the second portion 280.

The second part 280 is connected to the first part 270. The second part 280 is disposed between the body 14 of the casing 13 and the yoke part 210. The second part 280 is disposed away from the body 14 of the casing 13. The second part 280 is disposed away from the yoke part 210.

The radially inner end 282 of the second portion 280 is directly or indirectly connected to the radially inner end 272 of the first portion 270. The radially outer end 281 of the second portion 280 is positioned away from the first portion 270 in the circumferential direction. In this embodiment, the radially inner end 282 of the second portion 280 is indirectly connected to the radially inner end 272 of the first portion 270 via a portion extending in the circumferential direction.

The second portion 280 is disposed between adjacent support portions 240 in the circumferential direction. As long as the second portion 280 is positioned between adjacent support portions 240 in the circumferential direction, the second portion 280 may be positioned radially inward of the support portions 240. The outer end portion 281 of the second portion 280 in the radial direction is disposed away from the body 14 of the casing 13. The inner end portion 282 of the second portion 280 in the radial direction is disposed away from the yoke portion 210.

A second surface portion 283 is formed on the outer end portion 281 of the second portion 280 in the radial direction. The second surface portion 283 is spaced circumferentially away from the first surface portion 273 and faces the first surface portion 273. A gap is formed between the first surface portion 273 and the second surface portion 283. The length LB1 between the first surface portion 273 and the second surface portion 283 is, for example, 0.5 mm or more and 1.0 mm or less.

The length LS1 from the inner end to the outer end of the first surface portion 273 in the radial direction is longer than the length LB1 between the first surface portion 273 and the second surface portion 283. The length LS2 from the inner end to the outer end of the second surface portion 283 in the radial direction is longer than the length LB1 between the first surface portion 273 and the second surface portion 283. The inner end of the second surface portion 283 connects to the inner end of the first surface portion 273. The bent portion formed by the first portion 270 and the second portion 280 is prone to deformation starting from the connection between the first surface portion 273 and the second surface portion 283.

A third surface portion 284 is formed at the radially inner end portion 282 of the second portion 280. The third surface portion 284 forms the surface of the second portion 280 opposite the second surface portion 283 in the circumferential direction. The third surface portion 284 faces the third portion 290.

The third portion 290 connects to the second portion 280. The third portion 290 is disposed between the body 14 of the casing 13 and the yoke portion 210. The third portion 290 is disposed away from the body 14 of the casing 13. The third portion 290 connects to the outer peripheral surface 210S of the yoke portion 210.

The radially outer end 291 of the third portion 290 is directly or indirectly connected to the radially outer end 281 of the second portion 280. In this embodiment, the radially outer end 291 of the third portion 290 is indirectly connected to the radially outer end 281 of the second portion 280 via a portion extending in the circumferential direction. The radially inner end 292 of the third portion 290 is connected to the radially outer peripheral surface 210S of the yoke portion 210. The radially inner end 292 of the third portion 290 is positioned circumferentially away from both the first portion 270 and the second portion 280.

The third portion 290 is disposed between adjacent support portions 240 in the circumferential direction. As long as the third portion 290 is positioned between adjacent support portions 240 in the circumferential direction, the third portion 290 may be positioned radially inward of the support portions 240. The radially outer end portion 291 of the third portion 290 is disposed radially away from the body 14 of the casing 13.

A fourth surface portion 293 is formed at the radially inner end portion 292 of the third portion 290. The fourth surface portion 293 is spaced circumferentially away from the third surface portion 284 and faces the third surface portion 284. A gap is formed between the third surface portion 284 and the fourth surface portion 293. The length LB2 between the third surface portion 284 and the fourth surface portion 293 is, for example, 0.5 mm or more and 1.0 mm or less.

The radial length LS3 from the inner end to the outer end of the third surface portion 284 is longer than the length LB2 between the third surface portion 284 and the fourth surface portion 293. The radial length LS4 from the inner end to the outer end of the fourth surface portion 293 is longer than the length LB2 between the third surface portion 284 and the fourth surface portion 293. The outer end of the fourth surface portion 293 connects to the outer end of the third surface portion 284. The bent portion formed by the second portion 280 and the third portion 290 is prone to deformation starting from the connection between the third surface portion 284 and the fourth surface portion 293.

See FIG. 4. The length L2 of the second connection portion 260 in the circumferential direction is equal to, for example, the length L1 of the first connection portion 250 in the circumferential direction. The length L1 of the first connection portion 250 corresponds to, for example, the length from the first portion 270 to the third portion 290 in the circumferential direction. Similarly, the length L2 of the second connection portion 260 corresponds to, for example, the length from the first portion 270 to the third portion 290 in the circumferential direction.

The length L1 of the first connection portion 250 in the circumferential direction is less than or equal to the length LT of the tooth portion 220 in the circumferential direction. The length L2 of the second connection portion 260 in the circumferential direction is less than or equal to the length LT of the tooth portion 220 in the circumferential direction. The combined length of the length L1 of the first connection portion 250 and the length L2 of the second connection portion 260 is greater than or equal to the length LT of the tooth portion 220 in the circumferential direction.

The length L1 of the first connecting portion 250 in the circumferential direction is equal to or less than half the length LS of the support portion 240 in the circumferential direction. The length L2 of the second connecting portion 260 in the circumferential direction is equal to or less than half the length LS of the support portion 240 in the circumferential direction. Furthermore, the combined length of the length L1 of the first connecting portion 250 and the length L2 of the second connecting portion 260 is equal to or less than the length LS of the support portion 240.

Refer to FIG. 5. The inner surface of the first connecting portion 250 is radially spaced apart from the outer peripheral surface 210S of the yoke portion 210. The inner surface of the second connecting portion 260 is radially spaced apart from the outer peripheral surface 210S of the yoke portion 210. The inner surfaces of the first connecting portion 250 and the second connecting portion 260 correspond to the inner end surface of the inner end 272 of the first portion 270 and the inner end surface of the inner end 282 of the second portion 280. The radial distance D2 from the inner surface of the first connecting portion 250 to the outer peripheral surface 210S of the yoke portion 210 is, for example, 0.5 mm or more and 1.0 mm or less. The radial distance D3 from the inner surface of the second connecting portion 260 to the outer peripheral surface 210S of the yoke portion 210 is, for example, 0.5 mm or more and 1.0 mm or less.

The gap formed between the inner surfaces of the first connecting portion 250 and the second connecting portion 260 and the outer peripheral surface 210S of the yoke portion 210 is continuous with the gap formed between the inner peripheral surface 240S of the support portion 240 and the outer peripheral surface 210S of the yoke portion 210. The support portion 240 is connected to the yoke portion 210 only via the first connecting portion 250 and the second connecting portion 260.

<Operation of this embodiment>
The first function of this embodiment will be described.
The support portion 240 is fixed to the body 14 of the casing 13. When the stator core 200 is fixed to the casing 13 by a method such as shrink fitting, compressive stress is generated in the stator core 200. If compressive stress occurs in the yoke portion 210 of the stator core 200, iron loss occurs due to magnetic degradation, which may result in a deterioration in motor characteristics. In the stator core 200 of this embodiment, since the support portion 240 is fixed to the casing 13, this compressive stress is generated mainly in the support portion 240. Because the yoke portion 210 is connected to the support portion 240 via the first connecting portion 250 and the second connecting portion 260, the generation of compressive stress in the yoke portion 210 is suppressed by deformation of the first connecting portion 250 and the second connecting portion 260. Due to deformation of the first connecting portion 250 and the second connecting portion 260, the compressive stress generated in the yoke portion 210 is, for example, less than half of the compressive stress generated in the support portion 240.

As an example, when the stator core 200 is fitted into the body 14 of the casing 13, the support portion 240 moves radially inward. When the support portion 240 moves radially inward, the first connection portion 250 and the second connection portion 260 are deformed such that the first portion 270 moves radially inward and the second portion 280 moves circumferentially. The movement of the second portion 280 in the circumferential direction may be, for example, a movement in which the outer end 281 of the second portion 280 moves toward the first portion 270 and the inner end 282 of the second portion 280 moves toward the third portion 290. The movement of the second portion 280 in the circumferential direction may also be a movement in which the outer end 281 of the second portion 280 moves toward the third portion 290 and the inner end 282 of the second portion 280 moves toward the first portion 270. The radial movement of the first portion 270 may be accompanied by deformation such that the first portion 270 bends so that the outer end 271 and the inner end 272 approach each other. The circumferential movement of the second portion 280 may be accompanied by deformation such that the second portion 280 bends so that the outer end 281 and the inner end 282 approach each other. The deformation of the first connecting portion 250 and the second connecting portion 260 as described above reduces compressive stress in the portion of the yoke portion 210 where the magnetic path is formed.

A second function of this embodiment will be described.
First connecting portion 250 and second connecting portion 260 can function as a structure that suppresses the propagation of vibration between yoke portion 210 and casing 13. An example of the vibration between yoke portion 210 and casing 13 is vibration of yoke portion 210 caused by rotation of rotor core 400 when rotating electric machine 100 is in operation. By suppressing vibration caused by rotation of rotor core 400, it is possible to improve the vibration-damping performance of compressor 10 including rotating electric machine 100.

A third function of this embodiment will be described.
First connecting portion 250 and second connecting portion 260 are arranged to be aligned in the circumferential direction with support portion 240. The thickness of yoke portion 210 in the radial direction can be increased compared to when first connecting portion 250 and second connecting portion 260 are arranged in an inner region of support portion 240. This increases the area in yoke portion 210 where a magnetic path is formed, thereby suppressing an increase in iron loss due to magnetic saturation.

<Effects of this embodiment>
The effects of this embodiment will be described.
(1) The stator core 200 includes a yoke portion 210, a plurality of support portions 240, a first connection portion 250, and a second connection portion 260. The support portion 240 is provided radially outward of the yoke portion 210. The plurality of support portions 240 are provided lined up in the circumferential direction of the yoke portion 210. The plurality of support portions 240 support the yoke portion 210 on the body 14. The first connection portion 250 connects the yoke portion 210 to one end 241 of the support portion 240 in the circumferential direction. The second connection portion 260 connects the yoke portion 210 to the other end 242 of the support portion 240 in the circumferential direction. Each of the first connection portion 250 and the second connection portion 260 includes a first portion 270 and a second portion 280 between the connection portion with the support portion 240 and the connection portion with the yoke portion 210. The first portion 270 extends radially inward from the support portion 240. A radially inner end 282 of the second portion 280 is directly or indirectly connected to the radially inner end 272 of the first portion 270. A radially outer end 281 of the second portion 280 is spaced apart from the first portion 270 in the circumferential direction.

With this configuration, the outer end 281 of the second portion 280 in the radial direction is positioned away from the first portion 270 in the circumferential direction. That is, there is a gap between the first portion 270 and the outer end 281 of the second portion 280 in the circumferential direction. This gap allows the second portion 280 to move relative to the first portion 270. This allows the first connecting portion 250 and the second connecting portion 260 to deform. The deformation of the first connecting portion 250 and the second connecting portion 260 makes it less likely that compressive stress will occur in the yoke portion 210. This makes it less likely that iron loss will occur due to magnetic degradation.

(2) Each of the first connection portion 250 and the second connection portion 260 further includes a third portion 290 between the connection portion with the support portion 240 and the connection portion with the yoke portion 210. The radially outer end portion 291 of the third portion 290 is directly or indirectly connected to the radially outer end portion 281 of the second portion 280. The radially inner end portion 292 of the third portion 290 is positioned away from both the first portion 270 and the second portion 280 in the circumferential direction.

With this configuration, the radially inner end 292 of the third portion 290 is positioned away from the second portion 280 in the circumferential direction. In other words, there is a gap between the second portion 280 and the inner end 292 of the third portion 290 in the circumferential direction. This gap allows the third portion 290 to move relative to the second portion 280. This allows the first connecting portion 250 and the second connecting portion 260 to deform more appropriately.

(3) The second portion 280 is disposed between adjacent support portions 240 in the circumferential direction.

With this configuration, the second portion 280 is positioned between adjacent support portions 240, thereby increasing the radial size of the yoke portion 210 located inside the support portions 240.

(4) The length L1 of the first connecting portion 250 in the circumferential direction is equal to or less than half the length LS of the support portion 240 in the circumferential direction. The length L2 of the second connecting portion 260 in the circumferential direction is equal to or less than half the length LS of the support portion 240 in the circumferential direction.

With this configuration, the circumferential length LS of the support portion 240 can be made equal to or greater than the combined length of the circumferential length L1 of the first connection portion 250 and the circumferential length L2 of the second connection portion 260. This allows the portion of the yoke portion 210 located in the inner region inside the support portion 240 to be enlarged.

(5) A first surface portion 273 is formed at the outer end portion 271 of the first portion 270 in the radial direction. The first surface portion 273 faces the second portion 280. A second surface portion 283 is formed at the outer end portion 281 of the second portion 280 in the radial direction. The second surface portion 283 is spaced circumferentially away from the first surface portion 273 and faces the first surface portion 273. The length LS1 from the inner end to the outer end of the first surface portion 273 in the radial direction is longer than the length LB1 between the first surface portion 273 and the second surface portion 283. The length LS2 from the inner end to the outer end of the second surface portion 283 in the radial direction is longer than the length LB2 between the first surface portion 273 and the second surface portion 283.

With this configuration, the length from the inner end to the outer end of the gap between the first portion 270 and the outer end 281 of the second portion 280 in the circumferential direction is longer than the length LB2 between the first surface portion 273 and the second surface portion 283. This allows the second portion 280 to move favorably relative to the first portion 270.

(6) The stator core 200 further includes a plurality of teeth 220 extending radially inward from the yoke portion 210. The first connecting portion 250 and the second connecting portion 260 are each positioned radially outward from the teeth 220.

In the yoke portion 210, a magnetic path is unlikely to form in the radially outer portion of the tooth portion 220. With this configuration, the first connecting portion 250 and the second connecting portion 260 are provided in the portion of the stator core 200 where a magnetic path is unlikely to form. This makes it possible to suppress the reduction in the magnetic path caused by providing the first connecting portion 250 and the second connecting portion 260.

(7) A first connecting portion 250 is arranged on the radially outer side of each of the multiple tooth portions 220. A second connecting portion 260 is arranged on the radially outer side of each of the multiple tooth portions 220.

This configuration makes it possible to increase the number of first connection portions 250 and second connection portions 260 while suppressing the reduction in magnetic path caused by providing the first connection portions 250 and second connection portions 260. This allows the number of support portions 240 to be increased, thereby improving the support force of the support portions 240 for the yoke portion 210.

(8) The length L1 of the first connection portion 250 in the circumferential direction is less than or equal to the length LT of the tooth portion 220 in the circumferential direction. The length L2 of the second connection portion 260 in the circumferential direction is less than or equal to the length LT of the tooth portion 220 in the circumferential direction.

With this configuration, the circumferential length of each of the first connecting portion 250 and the second connecting portion 260 is less than the circumferential length LT of the tooth portion 220, allowing the first connecting portion 250 or the second connecting portion 260 to be suitably positioned on the outer side of the tooth portion 220.

(9) The stator core 200 further includes a plurality of teeth 220 and a plurality of slots 230. The teeth 220 extend radially inward from the yoke 210. The slots 230 are surrounded by adjacent teeth 220 in the circumferential direction and a portion of the yoke 210. Each of the plurality of support portions 240 is disposed radially outside each of the plurality of slots 230. The number of support portions 240 is the same as the number of slots 230.

With this configuration, the support portions 240 are located radially outward of the slots 230. This reduces compressive stress in the portion of the yoke portion 210 where the magnetic path is formed, compared to when the number of support portions 240 is fewer than the number of slots 230.

(10) The support portion 240 is fixed in contact with the inner peripheral surface 14S of the body 14.

This configuration allows the stator core 200 to be suitably fixed within the casing 13 by friction.

(11) The rotating electric machine 100 includes a stator core 200.

With this configuration, the stator core 200 has a structure that reduces compressive stress from the casing 13, so iron loss due to magnetic deterioration in the rotating electric machine 100 is small. This allows for higher efficiency of the rotating electric machine 100 compared to rotating electric machines with conventional stator cores.

(12) The compressor 10 is equipped with a rotating electric machine 100.

With this configuration, the efficiency of the rotating electric machine 100 equipped in the compressor 10 is high, thereby improving the energy efficiency of the compressor 10.

(13) The refrigeration device 1 is equipped with a compressor 10.

With this configuration, the refrigeration system 1 is configured with a highly energy-efficient compressor 10, thereby reducing power consumption.

<Modification>
In addition to the above-described embodiments, the refrigeration device 1, compressor 10, rotating electric machine 100, and stator core 200 of the present disclosure may also be configured in a form that combines, for example, the modified examples shown below, or at least two modified examples that are not mutually contradictory.

<Configuration of Supporting Part>
Please refer to Figures 6 and 7. The number and length of the support parts 240 can be variously configured other than the example shown in the embodiment.
For example, the stator core 200 may include three support portions 240 arranged in the circumferential direction. According to the configuration of this modification, the yoke portion 210 can be fixed inside the cylindrical body 14 of the casing 13 by the three support portions 240.

In the example shown in Figure 6, one slot 230 is positioned radially inside each of the three support portions 240. Because a slot 230 can be secured with no support portion 240 positioned radially outside, the thickness of the portion of the yoke portion 210 surrounding this slot 230 can be increased.

The example in Figure 7 differs from the example in Figure 6 in the length of the support portions 240 in the circumferential direction. In the example in Figure 7, two slots 230 are arranged radially inside each of the three support portions 240.

Furthermore, the thickness of the support portion 240 in the radial direction does not have to be constant. The thickness of the support portion 240 in the radial direction may vary depending on the position in the circumferential direction. The greater the thickness of the support portion 240 in the radial direction, the greater the strength of the support portion 240 can be.

In this modified example, the entire first connection portion 250 can be positioned radially outward of one of the tooth portions 220. Furthermore, the entire second connection portion 260 can be positioned radially outward of one of the tooth portions 220. This allows the portion of the yoke portion 210 located in the inner region of the support portion 240 to be optimally secured.

<Configuration of First Connection Portion and Second Connection Portion>
Please refer to Figures 8 to 16. The shapes of the first connecting portion 250 and the second connecting portion 260 can have various configurations other than the examples shown in the embodiment.

In the example shown in Figure 8, the inner end 272 of the first portion 270, the inner end 282 of the second portion 280, and the inner end 292 of the third portion 290 are located radially inward of the inner circumferential surface 240S of the support portion 240. The yoke portion 210 is formed to overlap the inner end 272 of the first portion 270, the inner end 282 of the second portion 280, and the inner end 292 of the third portion 290 in the circumferential direction.

In the example shown in FIG. 9, the first portion 270 is configured to bend circumferentially as it approaches the radially inner end 272. The second portion 280 is also configured to bend circumferentially as it approaches the radially inner end 282. The inner end 272 of the first portion 270 and the inner end 282 of the second portion 280 may be directly connected.

In the example of Figure 10, the inner end 272 of the first part 270, which is formed by a straight line, and the inner end 282 of the second part 280 are directly connected.

In the examples of Figures 11 to 13, each of the first connection portion 250 and the second connection portion 260 includes, in addition to the first portion 270 to the third portion 290, a fourth portion 510 and a fifth portion 520 between the connection portion with the support portion 240 and the connection portion with the yoke portion 210. The third portion 290 and the fourth portion 510 form a single bent portion. The fourth portion 510 and the fifth portion 520 also form a single bent portion.

In the example of Figure 11, a fourth part 510 and a fifth part 520 are added to the example of Figure 8. In the example of Figure 12, a fourth part 510 and a fifth part 520 are added to the example of Figure 9. In the example of Figure 13, a fourth part 510 and a fifth part 520 are added to the example of Figure 10.

In the example shown in Figure 14, the second portion 280 is positioned radially inward of the support portion 240. With this configuration, the support portion 240 can also be provided radially outward of the second portion 280, thereby enabling the yoke portion 210 to be suitably supported on the body 14. Furthermore, the third portion 290 is also positioned radially inward of the support portion 240.

In the example of Figure 15, when viewed in the axial direction, a first recess 531 is provided in the first surface portion 273. When viewed in the axial direction, a second recess 532 is provided in the second surface portion 283. The first recess 531 and the second recess 532 form openings 533 in each of the first connecting portion 250 and the second connecting portion 260. These openings allow each of the first connecting portion 250 and the second connecting portion 260 to deform appropriately.

As shown in the example of Figure 16, a gap 541 may be provided in each of the first connecting portion 250 and the second connecting portion 260. The gap 541 axially penetrates each of the first connecting portion 250 and the second connecting portion 260. The shape of the gap 541 can be set appropriately depending on the shapes of the first connecting portion 250 and the second connecting portion 260.

<Other Modifications>
The third portion 290 may be omitted from each of the first connecting portion 250 and the second connecting portion 260. In this modification, the portion corresponding to the third surface portion 284 may be directly connected to the yoke portion 210.

- The length L1 of the first connecting portion 250 in the circumferential direction may be greater than half the length LS of the support portion 240 in the circumferential direction. The length L2 of the second connecting portion 260 in the circumferential direction may be greater than half the length LS of the support portion 240 in the circumferential direction. In this modified example, the first connecting portion 250 and the second connecting portion 260 can be made larger, which more effectively allows for relative movement of the support portion 240 with respect to the yoke portion 210.

- The length L1 of the first connection portion 250 in the circumferential direction may be greater than the length LT of the tooth portion 220 in the circumferential direction. The length L2 of the second connection portion 260 in the circumferential direction may be greater than the length LT of the tooth portion 220 in the circumferential direction.

- As long as the bent portion formed by the first portion 270 and the second portion 280 can be deformed, the length LS1 from the inner end to the outer end of the first surface portion 273 in the radial direction may be equal to or less than the length LB1 between the first surface portion 273 and the second surface portion 283. Similarly, the length LS2 from the inner end to the outer end of the second surface portion 283 in the radial direction may be equal to or less than the length LB1 between the first surface portion 273 and the second surface portion 283.

- The first connecting portion 250 and the second connecting portion 260 may each be positioned away from the outer side of the tooth portion 220 in the radial direction. In other words, the first connecting portion 250 and the second connecting portion 260 may not overlap with the tooth portion 220 in the radial direction.

- In the embodiment, the rotating electric machine 100 has been described as the motor for the compressor 10, but the rotating electric machine 100 may also be applied to a generator in a power generation device. Alternatively, the rotating electric machine 100 may also be applied to a motor generator that has both the functions of a motor and a generator.

- The above describes embodiments of the refrigeration device 1, compressor 10, rotating electric machine 100, and stator core 200. However, it will be understood that various modifications in form and detail are possible without departing from the spirit and scope of the refrigeration device 1, compressor 10, rotating electric machine 100, and stator core 200 as set forth in the claims.

1...refrigeration device, 10...compressor, 13...casing, 14...body, 100...rotating electric machine, 200...stator core, 210...yoke portion, 220...teeth portion, 230...slot, 240...support portion, 250...first connecting portion, 260...second connecting portion, 270...first portion, 273...first surface portion, 280...second portion, 283...second surface portion, 290...third portion.

Claims (15)

A stator core (200) of a rotating electric machine (100) supported in a cylindrical body (14) of a casing (13),
a cylindrical yoke portion (210) provided inside the body (14);
a plurality of support portions (240) that are provided outward from the yoke portion (210) in the radial direction of the yoke portion (210) and are arranged side by side in the circumferential direction of the yoke portion (210), and that support the yoke portion (210) on the fuselage (14);
a first connection portion (250) that connects the yoke portion (210) and one end (241) of the support portion (240) in the circumferential direction;
a second connection portion (260) that connects the yoke portion (210) and the other end portion (242) of the support portion (240) in the circumferential direction,
Each of the first connecting portion (250) and the second connecting portion (260) has a portion between the connecting portion with the support portion (240) and the connecting portion with the yoke portion (210),
a first portion (270) extending radially inward from the support portion (240);
a second portion (280);
an inner end (282) of the second portion (280) in the radial direction is directly or indirectly connected to an inner end (272) of the first portion (270) in the radial direction;
an outer end (281) of the second portion (280) in the radial direction is spaced apart from the first portion (270) in the circumferential direction;
Stator core. Each of the first connecting portion (250) and the second connecting portion (260) further includes a third portion (290) between a connecting portion with the support portion (240) and a connecting portion with the yoke portion (210),
an outer end (291) of the third portion (290) in the radial direction is directly or indirectly connected to an outer end (281) of the second portion (280) in the radial direction;
an inner end (292) of the third portion (290) in the radial direction is spaced apart from both the first portion (270) and the second portion (280) in the circumferential direction;
The stator core according to claim 1 . The second portion (280) is disposed between adjacent support portions (240) in the circumferential direction.
The stator core according to claim 1 . The second portion (280) is disposed inward of the support portion (240) in the radial direction.
The stator core according to claim 1 . The length (L1) of the first connection portion (250) in the circumferential direction is equal to or less than half the length (LS) of the support portion (240) in the circumferential direction,
The length (L2) of the second connection portion (260) in the circumferential direction is equal to or less than half the length (LS) of the support portion (240) in the circumferential direction.
The stator core according to claim 3 . A first surface portion (273) facing the second portion (280) is configured at an outer end portion (271) of the first portion (270) in the radial direction,
A second surface portion (283) is configured at an outer end portion (281) of the second portion (280) in the radial direction, the second surface portion (283) being spaced apart from the first surface portion (273) in the circumferential direction and facing the first surface portion (273),
A length (LS1) from an inner end to an outer end of the first surface portion (273) in the radial direction is longer than a length (LB1) between the first surface portion (273) and the second surface portion (283),
A length (LS2) from the inner end to the outer end of the second surface portion (283) in the radial direction is longer than a length (LB1) between the first surface portion (273) and the second surface portion (283).
The stator core according to claim 1 . The rotor further includes a plurality of teeth (220) extending radially inward from the yoke (210),
Each of the first connection portion (250) and the second connection portion (260) is disposed outside the tooth portion (220) in the radial direction.
The stator core according to claim 1 . The first connection portion (250) is arranged on the outer side of each of the plurality of tooth portions (220) in the radial direction,
The second connection portion (260) is arranged on the outer side of each of the plurality of tooth portions (220) in the radial direction.
The stator core according to claim 7 . a length (L1) of the first connection portion (250) in the circumferential direction is equal to or less than a length (LT) of the teeth portion (220) in the circumferential direction;
The length (L2) of the second connection portion (260) in the circumferential direction is equal to or less than the length (LT) of the teeth portion (220) in the circumferential direction.
The stator core according to claim 7 . a plurality of teeth (220) extending radially inward from the yoke (210);
a plurality of slots (230) surrounded by the teeth portions (220) adjacent to each other in the circumferential direction and a part of the yoke portion (210),
Each of the plurality of support portions (240) is disposed outside each of the plurality of slots (230) in the radial direction,
The number of the supports (240) is the same as the number of the slots (230).
The stator core according to claim 1 . The support portion (240) includes three support portions (240) arranged in the circumferential direction.
The stator core according to claim 1 . The support portion (240) is fixed in contact with the inner peripheral surface (14S) of the body (14).
The stator core according to claim 1 . Comprising a stator core (200) according to any one of claims 1 to 12,
Rotating electric motor. The rotating electric machine (100) according to claim 13,
Compressor. The compressor (10) according to claim 14,
Refrigeration equipment.