Rotor and compressor

Abstract

A rotor (60) has a rotor core (30), a first counterweight (62) provided at an end face on one side in an axial direction of the rotor core (30), and a second counterweight (64) provided at an end face on the other side in the axial direction of the rotor core (30).

Description

Cross-reference to related registration

[0001] The present application is based on Japanese patent application No. 2023-049052, which was filed on March 24, 2023, and claims the priority advantage thereof, the description of which is incorporated herein by reference. Technical field

[0002] The present disclosure relates to a rotor and a compressor. State of the art

[0003] The JP 2020-105933 A reveals a compressor of spiral design. Summary

[0004] As a result of a detailed investigation by the inventors, a problem was found in that, with regard to the spiral compressor, a simple correction of an imbalance in a rotating body that has a rotor may be desirable.

[0005] Furthermore, as a result of a detailed investigation by the inventors, a problem was found in that for a spiral-type compressor, even when a counterweight is provided, suppression of an increase in size in an axial direction may be desirable.

[0006] According to a first objective of the present disclosure, one task is to provide a rotor in which an imbalance in a rotating body having the rotor can be easily corrected.

[0007] According to a second objective of the present disclosure, one task is to provide a compressor in which, even when a counterweight is provided, an increase in size in an axial direction can be suppressed.

[0008] A first aspect of the present disclosure is a rotor comprising a rotor core, a first counterweight provided at an end face on one side in an axial direction of the rotor core, and a second counterweight provided at an end face on the other side in the axial direction of the rotor core.

[0009] A second aspect of the present disclosure is a compressor comprising a motor unit and a compressor unit provided on one side in the axial direction of the motor unit, wherein the motor unit comprises a motor housing, a stator fixed to an inner side of the motor housing, a rotor rotatably provided on an inner side of the stator, and a shaft provided at a central section of the rotor; wherein the compressor unit comprises a compressor housing assembled with the motor housing, a stationary spiral fixed to an inner side of the compressor housing, and a movable spiral fixed in an eccentric state on the shaft and rotatably provided with respect to the stationary spiral; the rotor comprises a rotor core and a counterweight provided at an end face on one side in an axial direction of the rotor core;The counterweight has a fixing section that is fixed to an end face on one side in the axial direction of the rotor core, an axial direction extension section that extends from an end section on one side in an axial direction of the fixing section to a side in the axial direction of the rotor core, and a radial direction extension section that extends from an end section on a tip end face of the axial direction extension section to an outer surface in a radial direction of the rotor core; and the radial direction extension section is arranged in an axial direction of the motor unit in a space between the stator and the compressor housing.

[0010] According to the first aspect of the present disclosure, a rotor is provided in which an imbalance in a rotating body having the rotor can be easily corrected.

[0011] According to the second aspect of the present disclosure, a compressor is provided in which an increase in size in an axial direction can be suppressed even when a counterweight is provided. Brief description of the drawings Fig. Figure 1 is a longitudinal sectional view of main areas of a compressor having a rotor according to an embodiment of the present disclosure; Fig. 2 is a perspective exploded view of the rotor according to the embodiment of the present disclosure; Fig. Figure 3 is a perspective view of the rotor according to the embodiment of the present disclosure; Fig. 4 is a perspective view of a first counterweight according to the embodiment of the present disclosure; Fig. Figure 5 is a two-view orthogonal projection of the first counterweight according to the embodiment of the present disclosure; Fig. 6 is a diagram of a rotor core according to the embodiment of the present disclosure when viewed from one side in an axial direction; Fig. Figure 7 is a graph showing a relationship between the thickness of a second counterweight and the amount of rotational imbalance correction according to the embodiment of the present disclosure; Fig. Figure 8 is a graph showing a relationship between the thickness of the second counterweight and a moment imbalance correction amount according to the embodiment of the present disclosure; Fig. Figure 9 is a diagram comparing the axial lengths of two types of rotors; Fig. Figure 10 is a longitudinal section view of a first modification of a combination of the first counterweight and the second counterweight; Fig. Figure 11 is a longitudinal section view of a second modification of the combination of the first counterweight and the second counterweight; Fig. Figure 12 is a longitudinal section view of a third modification of the combination of the first counterweight and the second counterweight; Fig. Figure 13 is a longitudinal section view of a fourth modification of the combination of the first counterweight and the second counterweight; Fig. Figure 14 is a longitudinal section view of a fifth modification of the combination of the first counterweight and the second counterweight; Fig. Figure 15 is a longitudinal sectional view of a first modification of a form of the first counterweight; Fig. Figure 16 is a longitudinal section view of a second modification of the shape of the first counterweight; Fig. Figure 17 is a longitudinal section view of a third modification of the shape of the first counterweight; Fig. Figure 18 is a longitudinal section view of a fourth modification of the shape of the first counterweight; Fig. Figure 19 is a longitudinal section view of a fifth modification of the shape of the first counterweight; Fig. Figure 20 is a longitudinal section view of a sixth modification of the shape of the first counterweight; Fig. Figure 21 is a longitudinal section view of a seventh modification of the shape of the first counterweight; Fig. Figure 22 is a longitudinal section view of a modification of a configuration of a negative adjustment section; Fig. Figure 23 is a graph showing a relationship between the depth of a first negative adjustment section and the rotational imbalance correction amount; Fig. Figure 24 is a graph showing a relationship between the depth of the first negative adjustment section and the moment imbalance correction amount; Fig. Figure 25 is a longitudinal section view of a first modification of a form of the negative adjustment section; Fig. Figure 26 is a longitudinal section view of a second modification of the shape of the negative adjustment section; Fig. Figure 27 is a diagram of a first modification of a fixing section of the first counterweight; Fig. 28 is a diagram of a second modification of the fixing section of the first counterweight; Fig. Figure 29 is a perspective exploded view of a first modification of a rotor configuration; Fig. Figure 30 is a perspective exploded view of a second modification of the rotor configuration; and Fig. Figure 31 is a longitudinal section view of an example of a spiral compressor. Description of the embodiments

[0012] Fig. Figure 31 is a longitudinal sectional view of an example of a spiral compressor 10. The compressor 10 has a motor unit 12 and a compressor unit 14, which is provided on one side in an axial direction of the motor unit 12.

[0013] The motor unit 12 comprises a motor housing 16, a stator 18 which is fixed to an inside of the motor housing 16, a rotor 20 which is provided to be rotatable on an inside in a radial direction of the stator 18, and a shaft 22 which is provided at a middle section of the rotor 20.

[0014] The stator 18 comprises a stator core 24, an insulator 26 mounted on the stator core 24, and a winding wound around the stator core 24 with the insulator 26 in between. The rotor 20 comprises a rotor core 30 and a rotor magnet 32, which is provided at a section on one side of an outer circumferential surface of the rotor core 30.

[0015] The compressor unit 14 comprises a compressor housing 34, a stationary spiral 36 fixed to an inner surface of the compressor housing 34, and a movable spiral 38 rotatably mounted relative to the stationary spiral 36. The compressor housing 34 includes a first housing 40 assembled with the motor housing 16 and a second housing 42 provided on one side in the axial direction of the first housing 40.

[0016] An inlet opening 44 is formed in the motor housing 16. An outlet opening 46 is formed in the second housing 42. A space between the stationary spiral 36 and the movable spiral 38 is designed as a compression chamber. The inlet opening 44 is connected to the compression chamber by means of a space on the inside of the motor housing 16 and similar features. The compression chamber is connected to the outlet opening 46 by means of a flow path formed in the second housing 42 and similar features.

[0017] A first bearing 48 is provided in the motor housing 16, and a second bearing 50 is provided in the first housing 40. The shaft 22 is rotatably supported by the first bearing 48 and the second bearing 50. An eccentric shaft 52 is provided at one end section on one side in the axial direction of the shaft 22. A third bearing 54 is provided in the movable spiral 38. The movable spiral 38 is fixed in an eccentric position on the shaft 22 by the eccentric shaft 52, which is rotatably supported by the third bearing 54.

[0018] In the compressor 10, configured as described above, the shaft 22 rotates in unison with the rotor 20 when the stator 18 generates a rotating magnetic field. Furthermore, the movable spiral 38 rotates in conjunction with the rotation of the shaft 22, thereby changing the capacity of the compression chamber. A fluid drawn into the compression chamber from the inlet port 44 is compressed within the chamber. The compressed fluid is then discharged from the outlet port.

[0019] In the case of compressor 10, which is in Fig. As shown in Figure 31, the movable spiral 38 is fixed to the shaft 22 in an eccentric state. Therefore, an imbalance (i.e., a state in which a center of gravity of the rotating body is displaced from an axis of rotation) occurs in the rotating body comprising the movable spiral 38, the rotor 20, and the shaft 22. One method for suppressing the imbalance in the rotating body is to correct it by attaching a counterweight to the shaft 22 or the rotor 20.

[0020] However, the imbalance of the rotating body is difficult to correct simply by attaching a single counterweight to the shaft 22 or the rotor 20. Furthermore, suppressing any increase in the axial size of the compressor 10 resulting from the counterweight being attached to the shaft 22 or the rotor 20 is desirable.

[0021] According to a first objective of the present embodiments, it is a problem to provide a rotor in which an imbalance in the rotating body that has the rotor can be easily corrected.

[0022] According to a second objective of the present embodiments, one problem is to provide a compressor in which an increase in size in the axial direction can be suppressed even when a counterweight is provided.

[0023] In order to solve the problem according to the first objective of the present embodiment, a first aspect of the present embodiment is a rotor comprising a rotor core, a first counterweight provided at an end face on one side in an axial direction of the rotor core, and a second counterweight provided at an end face on the other side in the axial direction of the rotor core.

[0024] According to the first aspect of the present embodiment, the rotor core has a first counterweight provided on one side of the end face in the axial direction of the rotor core, and a second counterweight provided on the other side of the end face in the axial direction of the rotor core. Therefore, an imbalance in the rotating body comprising the rotor can be corrected by both the first and the second counterweight. Consequently, the imbalance in the rotating body can be corrected more easily compared to a case in which the rotor core has, for example, only one of the first and one of the second counterweights.

[0025] A second aspect of the present embodiment is the rotor according to the first aspect of the present embodiment, wherein the first counterweight has a first fixing section provided on the end face on one side in the axial direction of the rotor core, and a first axial direction extension section extending from an end section on an outer circumferential side of the first fixing section to one side in the axial direction of the rotor core.

[0026] According to the second aspect of the present embodiment, the first counterweight has a first fixing section, which is fixed to the end face on one side in the axial direction of the rotor core, and a first axial extension section, which extends from the end section on the outer circumferential side of the first fixing section to one side in the axial direction of the rotor core. Therefore, an imbalance in the rotating body can be corrected by, for example, adjusting the length of the first fixing section along a radial direction of the rotor core, the length of the first axial extension section along the axial direction of the rotor core, and so on. Consequently, an imbalance in the rotating body can be easily corrected.

[0027] A third aspect of the present embodiment is the rotor according to the second aspect of the present embodiment, wherein the first counterweight has a first radial direction extension section extending from an end section on a tip end side of the first axial direction extension section to an outside in the radial direction of the rotor core.

[0028] According to the third aspect of the present embodiment, the first counterweight has a first radial extension section that extends from the end section at the tip end of the first axial extension section to the outside in the radial direction of the rotor core. Therefore, an imbalance in the rotating body can be corrected, for example, by adjusting the length of the first radial extension section along the radial direction of the rotor core, and so on. Consequently, an imbalance in the rotating body can be easily corrected.

[0029] A fourth aspect of the present embodiment is the rotor according to the third aspect of the present embodiment, in which the length of the first radial direction extension section along the radial direction of the rotor core is longer than the length of the first axial direction extension section along the axial direction of the rotor core.

[0030] According to the fourth aspect of the present embodiment, the length of the first radial extension section along the radial direction of the rotor core is longer than the length of the first axial extension section along the axial direction of the rotor core. Therefore, the amount of imbalance correction achieved by the first counterweight can be increased compared to a case where the length of the first radial extension section is shorter than the length of the first axial extension section.

[0031] A fifth aspect of the present embodiment is the rotor according to one of the second to the fourth aspects of the present embodiment, wherein the thickness of the first fixing section along the axial direction of the rotor core is thinner than the thickness of the second counterweight along the axial direction of the rotor core.

[0032] According to the fifth aspect of the present embodiment, the thickness of the first fixing section along the axial direction of the rotor core is thinner than the thickness of the second counterweight along the axial direction of the rotor core. Therefore, a reduction in the length of the rotor in the axial direction can be achieved compared to a case in which, for example, the thickness of the first fixing section is equal to the thickness of the second counterweight.

[0033] A sixth aspect of the present embodiment is the rotor according to one of the aspects from the second to the fifth aspect of the present embodiment, wherein the first fixing section and the first axial direction extension section are formed in plate forms.

[0034] According to the sixth aspect of the present embodiment, the first fixing section and the first axial direction extension section are formed in plate shapes. Therefore, the shapes of the first fixing section and the first axial direction extension section can be selected based on the surrounding space of the rotor core. Consequently, one degree of freedom in the arrangement of the first counterweight can be improved compared to a case in which the first counterweight is formed, for example, in a block shape.

[0035] A seventh aspect of the present embodiment is the rotor according to one of the third aspect, the fourth aspect and the fifth aspect or the sixth aspect, which are dependent on the third aspect, wherein the first fixing section, the first axial direction extension section and the first radial direction extension section are formed in plate shapes.

[0036] According to the seventh aspect of the present embodiment, the first fixing section, the first axial extension section, and the first radial extension section are formed in plate shapes. Therefore, the shapes of the first fixing section, the first axial extension section, and the first radial extension section can be selected based on the surrounding space of the rotor core. Consequently, the degree of freedom in arranging the first counterweight can be improved compared to a case where the first counterweight is formed, for example, in a block shape.

[0037] An eighth aspect of the present embodiment is the rotor according to one of the aspects from the second to the seventh aspect of the present embodiment, wherein the first axial direction extension section is formed in a circular arc shape along a circumferential direction of the rotor core.

[0038] According to the eighth aspect of the present embodiment, the first axial direction extension section is formed in a circular arc shape along the circumferential direction of the rotor core. Therefore, the size of the first axial direction extension section can be increased compared to a case in which the first axial direction extension section is, for example, formed in a rectangular shape. As a result, the amount of imbalance correction provided by the first counterweight can be increased.

[0039] A ninth aspect of the present embodiment is the rotor according to one of the third, fourth and fifth aspects up to the seventh aspect, which depend on the third aspect, wherein the first axial direction extension section and the first radial direction extension section are each formed in a circular arc shape along the circumferential direction of the rotor core.

[0040] According to the ninth aspect of the present embodiment, the first axial extension section and the first radial extension section are each formed in a circular arc shape along the circumferential direction of the rotor core. Therefore, the dimensions of the first axial extension section and the first radial extension section can be increased compared to a case in which the first axial extension section and the first radial extension section are, for example, formed in rectangular shapes. As a result, the amount of imbalance correction provided by the first counterweight can be increased.

[0041] A tenth aspect of the present embodiment is the rotor according to one of the aspects from the first to the ninth aspect of the present embodiment, wherein the rotor core has a shaft insertion hole formed in a central section of the rotor core in which the shaft is inserted, and the first counterweight has a positioning section which positions the first counterweight with respect to the shaft.

[0042] According to the tenth aspect of the present embodiment, the rotor core has a shaft insertion hole formed in a central section of the rotor core, into which the shaft is inserted. The first counterweight has a positioning section that positions the first counterweight relative to the shaft. Therefore, the first counterweight can be positioned relative to the shaft by using the positioning section. Consequently, the accuracy of the unbalance correction amount can be ensured by the first counterweight compared to a case where, for example, the positioning section is not provided.

[0043] An eleventh aspect of the present embodiment is the rotor according to one of the aspects from the first to the tenth aspect of the present embodiment, wherein the rotor core has a negative compensating section which is formed in a hollow shape at a position that is eccentric from the central section of the rotor core to the outside in the radial direction of the rotor core.

[0044] According to the eleventh aspect of the present embodiment, the rotor has a negative balancing section which is formed in a hollow shape at a position eccentric to the outer edge of the rotor core in the radial direction. Therefore, the imbalance of the rotating body can be corrected not only by the first counterweight and the second counterweight, but also by the negative balancing section. Consequently, the first counterweight and the second counterweight can be reduced in size compared to a case where the rotor core, for example, does not have a negative balancing section.

[0045] A twelfth aspect of the present embodiment is the rotor according to the eleventh aspect of the present embodiment, wherein the rotor has a rotor magnet which is provided in a position which is further on the outside in the radial direction of the rotor core than the negative compensation section, and the negative compensation section is formed in a position which avoids a magnetic path which is generated by the rotor magnet.

[0046] According to the twelfth aspect of the present embodiment, the negative compensation section is formed in a position that avoids the magnetic path generated by the rotor magnet. Therefore, an area for the magnetic path can be ensured compared to a case in which, for example, at least a portion of the negative compensation section is formed within the magnetic path generated by the rotor magnet. Consequently, a deterioration of the motor unit's properties can be suppressed.

[0047] A thirteenth aspect of the present embodiment is the rotor according to the eleventh aspect or the twelfth aspect of the present embodiment, wherein the rotor has the rotor magnet which is provided at a position which is further on the outside in the radial direction of the rotor core than the negative compensation section, and at least one section of the negative compensation section is formed at a position which corresponds to a middle section of the rotor magnet in a lateral width direction.

[0048] According to the thirteenth aspect of the present embodiment, at least one section of the negative balancing section is formed at a position corresponding to the central section of the rotor magnet in the lateral width direction. Therefore, at least one section of the negative balancing section can be positioned closer to the outer surface in the radial direction of the rotor core, while at least one section of the negative balancing section is prevented from being formed in the magnetic path generated by the rotor magnet. Consequently, the amount of imbalance correction provided by the negative balancing section can be increased.

[0049] A fourteenth aspect of the present embodiment is the rotor according to one of the eleventh aspect to the thirteenth aspect of the present embodiment, wherein the rotor has a plurality of rotor magnets provided at positions which are further on the outside in the radial direction of the rotor core than the negative compensation section, the plurality of rotor magnets arranged to be aligned in the circumferential direction of the rotor, and at least one section of the negative compensation section is formed at a position which corresponds to a section between adjacent rotor magnets.

[0050] According to the fourteenth aspect of the present embodiment, at least one section of the negative balancing section is formed in a position corresponding to a section between adjacent rotor magnets. Therefore, at least one section of the negative balancing section can be positioned further outwards in the radial direction of the rotor core, while at least one section of the negative balancing section is prevented from being formed in the magnetic path generated by the rotor magnet. Consequently, the amount of imbalance correction provided by the negative balancing section can be increased.

[0051] A fifteenth aspect of the present embodiment is the rotor according to one of the eleventh aspect to the fourteenth aspect of the present embodiments, wherein the negative compensation section has a first negative compensation section which is open at an end face on one side in the axial direction of the rotor core, and a second negative compensation section which is open at an end face on the other side in the axial direction of the rotor core.

[0052] According to the fifteenth aspect of the present embodiment, the negative balancing section comprises a first negative balancing section, which is open at one end face in the axial direction of the rotor core, and a second negative balancing section, which is open at the other end face in the axial direction of the rotor core. Therefore, an imbalance in the rotating body can be corrected by both the first and the second negative balancing section. Consequently, the imbalance in the rotating body can be corrected more easily compared to a case in which, for example, only one of the first and second negative balancing sections is provided.

[0053] A sixteenth aspect of the present embodiment is the rotor according to one of the third aspect to the fifteenth aspect, which depend on the second aspect of the present disclosure, wherein the rotor core has a magnet receiving hole which is open at an end face on one side in the axial direction of the rotor core and receives the rotor magnet, the magnet receiving hole is sealed by the first fixing section and the first fixing section has a magnet cooling hole which is formed at a position which, when viewed from the axial direction of the rotor core, is next to the rotor magnet.

[0054] According to the sixteenth aspect of the present embodiment, the first fixing section has the magnet cooling hole, which is formed in a position adjacent to the rotor magnet when viewed from the axial direction of the rotor core. Therefore, the rotor magnet can be cooled by conveying a fluid to the magnet cooling hole.

[0055] A seventeenth aspect of the present embodiment is the rotor according to a distinction from the first aspect to the sixteenth aspect of the present embodiment, wherein the second counterweight has a second fixing section fixed at an end face on the other side in the axial direction of the rotor core, a second axial direction extension section extending from an end section on an outer circumferential side of the second fixing section to the other side in the axial direction of the rotor core, and a second radial direction extension section extending from an end section on a tip end face of the second axial direction extension section to the outside in the radial direction of the rotor core.

[0056] According to the seventeenth aspect of the present embodiment, the second counterweight has the second fixing section, which is fixed to the end face on the other side in the axial direction of the rotor core, wherein the second axial direction extension section extends from the end section on the outer circumferential side of the second fixing section to the other side in the axial direction of the rotor core, and the second radial direction extension section extends from the end section on the tip end side of the second axial direction extension section to the outside in the radial direction of the rotor core.Therefore, an imbalance in the rotating body can be corrected by, for example, adjusting the length of the second fixing position along the radial direction of the rotor core, the length of the second axial direction extension section along the axial direction of the rotor core, the length of the second radial direction extension section along the radial direction of the rotor core, and similar adjustments. Consequently, the imbalance in the rotating body can be easily corrected.

[0057] To achieve the objective of the second objective of the present embodiment, an eighteenth aspect of the present embodiment is a compressor comprising a motor unit and a compressor unit provided on one side in the axial direction of the motor unit, wherein the motor unit comprises a motor housing, a stator fixed to an inner side of the motor housing, a rotor rotatably mounted on an inner side of the stator, and a shaft provided at a central section of the rotor; wherein the compressor unit comprises a compressor housing assembled with the motor housing, a stationary spiral fixed to an inner side of the compressor housing, and a movable spiral fixed to the shaft in an eccentric position and rotatably mounted with respect to the stationary spiral;the rotor has a rotor core and a counterweight provided at an end face on one side in an axial direction of the rotor core; the counterweight has a fixing section fixed at an end face on one side in the axial direction of the rotor core, an axial direction extension section extending from an end section on one side in an axial direction of the fixing section to a side in the axial direction of the rotor core, and a radial direction extension section extending from an end section on a tip end face of the axial direction extension section to an outside in a radial direction of the rotor core; and the radial direction extension section is arranged in an axial direction of the motor unit in a space between the stator and the compressor housing.

[0058] According to the eighteenth aspect of the present embodiment, the radial extension section is located in the axial direction of the motor unit in the space between the stator and the compressor housing. Here, the space between the stator and the compressor housing in the axial direction of the motor unit is a dead space. Therefore, an increase in the size of the compressor in the axial direction can be suppressed even when the counterweight is provided.

[0059] A nineteenth aspect of the present embodiment is the compressor according to the eighteenth aspect of the present embodiment, wherein the rotor has an imbalance correction section which includes the counterweight, and the imbalance correction section has an imbalance correction amount which counteracts an imbalance due to the movable spiral.

[0060] According to the nineteenth aspect of the present embodiment, the rotor has an imbalance correction section which includes the counterweight, and the imbalance correction section has an imbalance correction factor that counteracts the imbalance due to the movable spiral. As a result, an imbalance in the rotating body comprising the rotor and the movable spiral can be corrected. Consequently, the occurrence of noise accompanying the rotation of the rotating body and similar phenomena can be suppressed.

[0061] A twentieth aspect of the present embodiment is the compressor according to the eighteenth aspect or the nineteenth aspect of the present embodiment, wherein the stator has a stator core arranged on the outside in the radial direction of the rotor core, a connecting section between the axial direction extension section and the first fixing section is positioned further on an inside than an outside form of the rotor core, and an end section is positioned on an outside circumferential side of the radial direction extension section further on an inside than an outside form of the stator core.

[0062] According to the twentieth aspect of the present embodiment, the connecting section between the axial extension section and the first fixing section is positioned further inward than the outer shape of the rotor core. This means that the first fixing section can be prevented from interfering with the stator core, which is located on the outside in the radial direction of the rotor core. Furthermore, the end section on the outer circumferential side of the radial extension section is positioned further inward than the outer shape of the rotor core. Therefore, the radial extension section can be prevented from interfering with the motor housing and similar components located on the outside in the radial direction of the stator core.

[0063] Fig. Figure 1 is a longitudinal sectional view of main areas of the compressor 10, which has a rotor 60, according to the present embodiment. The compressor 10, which is located in Fig. Figure 1 shows a configuration that includes the rotor 60, which is described below, similar to that of the compressor 10, which is shown in Fig. 31 is shown. Therefore, the same reference symbols are used as those in Fig. 31 are used and descriptions are omitted. Fig. Figure 2 is a perspective exploded view of the rotor 60 according to the present embodiment. Fig. Figure 3 is a perspective view of the rotor 60 according to the present embodiment.

[0064] The rotor 60 comprises a rotor core 30, a first counterweight 62, a second counterweight 64, a first cover plate 66, and a second cover plate 68. The first counterweight 62 is an example of the “counterweight” of the present disclosure.

[0065] The first cover plate 66 is provided at an end face on one side in the axial direction of the rotor core 30. The second cover plate 68 is provided at an end face on the other side in the axial direction of the rotor core 30. A shaft insertion hole 70 is formed in the first cover plate 66. A shaft insertion hole 72 is formed in the second cover plate 68. The first cover plate 66 is fixed to the shaft 22 and the rotor core 30 by pressing the shaft 22 into the shaft insertion hole 70. The second cover plate 68 is fixed to the shaft 22 and the rotor core 30 in a similar manner by pressing the shaft 22 into the shaft insertion hole 72.

[0066] The first counterweight 62 is attached to the end face on one side of the rotor core 30 in the axial direction, with the first cover plate 66 between them. The second counterweight 64 is attached to the end face on the other side of the rotor core 30 in the axial direction, with the second cover plate 68 between them. For example, the first counterweight 62 can be made of a metal sheet and be in the form of a plate. The second counterweight 64, viewed from the axial direction of the rotor core 30, is, for example, formed in the shape of a circular arc along the circumferential direction of the rotor 60. The second counterweight 64 is fixed to the rotor core 30 by press fitting, crimping, or similar means.

[0067] The rotor core 30 has a shaft insertion hole 74, a magnet mounting hole 76, and a negative compensation section 78. The shaft insertion hole 74 is formed in a central section of the rotor core 30 and extends through the rotor core 30 in the axial direction. The shaft 22 is inserted into the shaft insertion hole 74 (for example, pressed in), and the rotor core 30 is thereby fixed to the shaft 22.

[0068] The magnet receiving hole 76 is formed on a section of the outer circumferential surface of the rotor core 30 and extends through it in the axial direction of the rotor core 30. The rotor magnet 32 ​​is received in the magnet receiving hole 76. As a result, the rotor magnet 32 ​​is a composite magnet. The magnet receiving hole 76 is sealed on both sides in the axial direction of the rotor core 30 by the first cover plate 66 and the second cover plate 68.

[0069] The first counterweight 62, the second counterweight 64 and the negative counterweight section 78 form an imbalance correction section 80, which corrects an imbalance in the rotating body comprising the rotor 60, the shaft 22 and the movable spiral 38 (see Fig. 31).

[0070] Here in Fig. Figure 1 shows the first counterweight 62, the second counterweight 64, and the negative counterweight section 78 for simplification, to ensure they are arranged in the same position around the circumference of the rotor core 30. However, the corresponding positions of the first counterweight 62, the second counterweight 64, and the negative counterweight section 78 around the circumference of the rotor core 30 with respect to the imbalance caused by the movable spiral 38 are chosen such that the first counterweight 62, the second counterweight 64, and the negative counterweight section 78 correct the imbalance in the rotating body.

[0071] In the example that is in Fig. 1 to Fig. As shown in Figure 3, the negative compensation section 78 runs axially through the rotor core 30. However, the negative compensation section 78 does not necessarily have to run axially through the rotor core 30. The negative compensation section 78 is formed at a position that is further outward in the radial direction of the rotor core 30 than the shaft insertion hole 74 and further inward in the radial direction of the rotor core 30 than the magnet receiving hole 76.

[0072] Fig. Figure 4 is a perspective view of the first counterweight 62 according to the present embodiment. Fig. Figure 5 is a two-view orthogonal projection of the first counterweight 62 according to the present embodiment. The first counterweight 62 has a fixing section 82, an axial direction extension section 84, and a radial direction extension section 86. The fixing section 82 is an example of the "first fixing section" of the present disclosure. The axial direction extension section 84 is an example of the "first axial direction extension section" of the present disclosure. The radial direction extension section 86 is an example of the "first radial direction extension section" of the present disclosure.

[0073] The fixing section 82 is fixed to the first cover plate 66 between them at one end face in the axial direction of the rotor core 30. The axial direction extension section 84 extends from an end section 82A on an outer circumferential side of the fixing section 82 to a side in the axial direction of the rotor core 30. The radial direction extension section 86 extends from an end section 84A on a tip end face of the axial direction extension section 84 to the outside in the axial direction of the rotor core 30.

[0074] A length L1 of the radial direction extension section 86 along the radial direction of the rotor core 30 is longer than a length L2 of the axial direction extension section 84 along the axial direction of the rotor core 30. A thickness T1 of the fixing section 82 along the axial direction of the rotor core 30 is thinner than a thickness T2 of the second counterweight 64 along the axial direction of the rotor core 30 (see Fig. 2).

[0075] The fixing section 82, the axial extension section 84, and the radial extension section 86 are each rectangular in shape. The fixing section 82 has a shaft insertion hole 88. The shaft insertion hole 88 extends along the thickness of the fixing section 82 (i.e., the axial direction of the rotor core 30). The shaft 22 is inserted (for example, pressed into) in the shaft insertion hole 88, and the first counterweight 62 is thereby fixed to the rotor core 30.

[0076] Furthermore, the fixing section 82 has a keyway 90. The keyway 90 is formed in a shape in which a section is notched in a recess shape in a circumferential direction of the shaft insertion hole 88. A projecting section (not shown) formed in the shaft 22 is fitted into the keyway 90, and the first counterweight 62 is thereby positioned in a rotational direction with respect to the shaft 22. A positioning hole 92 can be formed in the fixing section 82. A rivet (not shown) can be inserted into the positioning hole 92 and pressed into a rivet hole (not shown) formed in the rotor core 30, thereby positioning the first counterweight 62 on the rotor core 30. The keyway 90 and the positioning hole 92 are an example of the "positioning section" of the present disclosure.

[0077] As in Fig. As shown in Figure 1, a bearing housing section 94, which accommodates the second bearing 50, is formed in the first housing 40. The bearing housing section 94 has a bottom surface that faces the end surface on one side in the axial direction of the rotor core 30 and the motor unit 12. The fixing section 82 is arranged in a space 96 between the end surface on one side in the axial direction of the rotor core 30 and the bottom surface of the bearing housing section 94.

[0078] Furthermore, the bearing housing section 94 has an outer circumferential surface that faces an inner circumferential section (i.e., an inner circumferential surface of the insulator 26) and the stator 18 in the radial direction of the motor unit 12. The axially extending section 84 is located in a space 98 between the inner circumferential section of the stator 18 and the outer circumferential surface of the bearing housing section 94. The space 98 between the inner circumferential section of the stator 18 and the outer circumferential surface of the bearing housing section 94 is a dead space formed in the radial direction of the motor unit 12 between the stator 18 and the compressor housing 34.

[0079] The first housing 40 has a surface opposite the stator 18 in the axial direction of the motor unit 12. The radial extension section 86 is arranged in a space 100 between the stator 18 and the surface opposite the first housing 40. The space 100 is a dead space formed in the axial direction of the motor unit 12 between the stator 18 and the compressor housing 34.

[0080] A virtual line A, which is in Fig. Figure 5 shows an outer shape (i.e., an outer circumferential surface) of the rotor core 30. A connecting section between the axial direction extension section 84 and the fixing section 82 (i.e., the end section 82A on the outer circumferential surface of the fixing section 82) is positioned further inward than the outer shape of the rotor core 30. Furthermore, a virtual line B, which is shown in Fig. Figure 5 shows an outer shape (i.e., the outer circumferential surface) of the rotor core 24. The end section 86A on the outer circumferential side of the radial direction extension section 86 is positioned further on the inside than the outer shape of the stator core 24.

[0081] Fig. Figure 6 is a diagram of the rotor core 30 according to the present embodiment, viewed from one side in the axial direction. A plurality of magnet receiving holes 76 are formed in the rotor core 30. The plurality of magnet receiving holes 76 are arranged in the circumferential direction of the rotor core 30. Each magnet receiving hole 76 extends in a tangential direction to the rotor core 30 when viewed from the axial direction. The rotor magnet 32 ​​(see Figure 6) Fig. 1) is received in the magnet receiving hole 76 and is thereby arranged at a position which is further on the outside in the radial direction of the rotor core 30 than the negative compensation section 78.

[0082] As an example, if the rotor core 30 is divided into a first surface A1 and a second surface A2 by a center line when viewed from the axial direction of the rotor core 30, the negative compensating section 78 is formed in the first surface A1. The negative compensating section 78 is formed at a position that avoids a magnetic path generated by the rotor magnet 32. That is, a virtual line C is a line of outermost diameter positioned to avoid the magnetic path generated by the rotor magnet 32. The negative compensating section 78 is formed further inward in the radial direction of the rotor core 30 than virtual line C. Furthermore, a virtual line D is a line of innermost diameter at a position that ensures a thickness with respect to the shaft insertion hole 74.The negative compensation section 78 is formed further on the outside in the radial direction of the rotor core 30 than the virtual line D.

[0083] Here, the negative compensation section 78 is formed in a case where a rivet hole 102 is formed in the rotor core 30, at a position that ensures a certain thickness with respect to the rivet hole 102. That is, a virtual line E is a line of outermost diameter at a position that ensures a certain thickness with respect to the rivet hole 102. The negative compensation section 78 is formed on the outside of the virtual line E. Furthermore, a virtual line F is a line of outermost diameter of a section where a certain thickness must be ensured to guarantee the magnetic path. The negative compensation section 78 is formed on the outside of the virtual line F.

[0084] Fig. Figure 7 is a graph showing a relationship between the thickness of the second counterweight 64 and a rotational imbalance correction amount according to the present embodiment. The rotational imbalance correction amount is an example of the "imbalance correction amount" of the present disclosure. The imbalance correction section 80 has, as a rotational imbalance correction amount for correcting the rotational imbalance due to the movable spiral 38, a rotational imbalance correction amount due to the first counterweight 62, a rotational imbalance correction amount due to the second counterweight 64, and a rotational imbalance correction amount due to the negative counterweight section 78.

[0085] The rotational imbalance correction amount due to the negative balancing section 78 corresponds to a rotational imbalance correction amount due to the second surface A2 on the side opposite the first surface A1 in which the negative balancing section 78 is formed. The rotational imbalance and the rotational imbalance correction amount referred to herein are calculated by the product of a mass and a distance from an axis of rotation to a center of mass along the radial direction of the rotor core 30.The corresponding positions of the first counterweight 62, the second counterweight 64 and the negative counterweight section 78 in the circumferential direction of the rotor core 30 are chosen such that the rotational imbalance correction amount by the first counterweight 62, the rotational imbalance correction amount by the second counterweight 64 and the rotational imbalance correction amount by the negative counterweight section 78 are balanced with the rotational imbalance due to the movable spiral 38.

[0086] In the example that is in Fig. As shown in Figure 8, the thickness of the second counterweight 64 is determined by the rotational imbalance correction amount due to the first counterweight 62 and the rotational imbalance correction amount due to the negative balancing section 78 as fixed values. A graph G1 is a graph that shows a relationship between the thickness of the second counterweight 64 and the rotational imbalance correction amount. If the rotational imbalance due to the movable helix 38 is a setup condition (a target value), the second counterweight 64 only needs to have a thickness T2 corresponding to an intersection point between graph G1 and the target value in order to correct the rotational imbalance due to the movable helix 38.

[0087] Here, the thickness of the second counterweight 64 is determined. However, dimensions other than the thickness may be determined. Furthermore, the rotational imbalance correction amount due to the first counterweight 62 and the rotational imbalance correction amount due to the negative counterweight section 78 are fixed values. However, a dimension of the first counterweight 62, along with the rotational imbalance correction amount due to the second counterweight 64 and the rotational imbalance correction amount due to the negative counterweight section 78, may be determined as fixed values. Furthermore, a dimension of the negative counterweight section 78, along with the rotational imbalance correction amount due to the first counterweight 62 and the rotational imbalance correction amount due to the second counterweight 64, may be determined as fixed values.

[0088] Fig. Figure 8 is a graph showing a relationship between the thickness of the second counterweight 64 and a moment unbalance correction amount according to the present embodiment. The moment unbalance correction amount is an example of the “unbalance correction amount” of the present disclosure. The unbalance correction section 80 has a moment unbalance correction amount for correcting the moment unbalance due to the movable spiral 38, a moment unbalance correction section through the first counterweight 62, a moment unbalance correction amount through the second counterweight 64, and a moment unbalance correction amount through the negative counterweight section 78.

[0089] The moment imbalance correction amount due to the negative balancing section 8 corresponds to a moment imbalance correction amount due to the second surface A2 on the side opposite the first surface A1 in which the negative balancing section 78 is formed. The moment imbalance and the moment imbalance correction amount referred to herein are calculated by the product of a rotational imbalance correction amount and a distance from the first bearing 48 to the center of gravity along the axial direction of the rotor core 30.The corresponding positions of the first balancing weight 62, the second balancing weight 64 and the negative balancing section 78 are set such that the moment imbalance correction amount by the first balancing weight 62, the moment imbalance correction amount by the second balancing weight 64 and the moment imbalance correction amount by the negative balancing section 78 are balanced with the moment imbalance due to the movable spiral 38.

[0090] In the example that is in Fig. As shown in Figure 8, the thickness of the second balancing weight 64 is determined by the moment imbalance correction amount due to the first balancing weight 62 and the moment imbalance correction amount due to the negative balancing section 78 as fixed values. A graph G2 is a graph showing a relationship between the thickness of the second balancing weight 64 and the moment imbalance. If the moment imbalance due to the movable spiral 38 is a setup condition (a target value), the second balancing weight 64 only needs to have the thickness T2 corresponding to an intersection point between graph G2 and the target value in order to correct the moment imbalance due to the movable spiral 38.

[0091] Here, the thickness of the second balancing weight 64 is determined. However, dimensions other than the thickness may be determined. Furthermore, the moment imbalance correction amount due to the first balancing weight 62 and the moment imbalance correction amount due to the negative balancing section 78 are fixed values. However, a dimension of the first balancing weight 62 with the moment imbalance correction amount due to the second balancing weight 64 and the moment imbalance correction amount due to the negative balancing section 78 may be determined as fixed values. Furthermore, a dimension of the negative balancing section 78 with the moment imbalance correction amount due to the first balancing weight 62 and the moment imbalance correction amount due to the second balancing weight 62 may be determined as fixed values.

[0092] Next, the effects according to the present embodiment will be described.

[0093] According to the present embodiment, the rotor core 30 has a first counterweight 62, which is provided on the end face on one side in the axial direction of the rotor core 30, and a second counterweight 64, which is provided on the end face on the other side in the axial direction of the rotor core 30. Therefore, the imbalance in the rotating body comprising the rotor 60 can be corrected by both the first counterweight 62 and the second counterweight 64. Accordingly, an imbalance in the rotating body can be corrected more easily compared to a case in which only one of the first counterweight 62 and the second counterweight 64 are provided.

[0094] Furthermore, according to the present embodiment, the first counterweight 62 has the fixing section 82, which is fixed to the end face on one side in the axial direction of the rotor core 30, the axial direction extension section 84, which extends from the end section 82A on the outer circumferential side of the fixing section 82 to one side in the axial direction of the rotor core 30, and the radial direction extension section 86, which extends from the end section 84A on the tip end side of the axial direction extension section 84 to the outside in the radial direction of the rotor core 30.Therefore, an imbalance in the rotating body can be corrected by, for example, adjusting the length of the fixing section 82 along the radial direction of the rotor core 30, the length of the axial direction extension section 84 along the axial direction of the rotor core, the length of the radial direction extension section along the radial direction of the rotor core 30, and similar adjustments. Consequently, an imbalance in the rotating body can be easily corrected.

[0095] Furthermore, according to the present embodiment, the length L1 of the radial direction extension section 86 along the radial direction of the rotor core 30 is longer than the length L2 of the axial direction extension section 84 along the axial direction of the rotor core 30. Therefore, the amount of imbalance correction by the first balancing weight 62 can be increased compared to a case in which the length L1 of the radial direction extension section 86 is, for example, shorter than the length L2 of the axial direction extension section 84.

[0096] Furthermore, the thickness T1 of the fixing section 82 along the axial direction of the rotor core 30 is thinner according to the present embodiment than the thickness T2 of the second counterweight 84 along the axial direction of the rotor core 30. Therefore, the length of the rotor 60 in the axial direction can be reduced compared to a case in which the thickness T1 of the fixing section 82 is, for example, equal to the thickness T2 of the second counterweight 64.

[0097] Furthermore, according to the present embodiment, the fixing section 82, the axial direction extension section 84, and the radial direction extension section 86 are formed in plate shapes. Therefore, the shapes of the fixing section 82, the axial direction extension section 84, and the radial direction extension section 86 can be selected based on the spaces 96, 98, and 100 that surround the rotor core 30. Consequently, the degree of freedom in the arrangement of the first counterweight 62 can be improved compared to a case in which the first counterweight 62 is formed, for example, in a block shape.

[0098] Furthermore, according to the present embodiment, the rotor core 30 has the shaft insertion hole 74, which is formed in the central section of the rotor core 30 and into which the shaft 22 is inserted. The first counterweight 62 has the keyway 90 and the positioning hole 92 for positioning the shaft 22. Therefore, the first counterweight 62 can be positioned relative to the shaft 22 by using the keyway 90 and the positioning hole 92. Consequently, the accuracy of the unbalance correction amount can be ensured by the first counterweight 62 compared to a case in which, for example, the keyway 90 and the positioning hole 92 are not provided.

[0099] Furthermore, according to the present embodiment, the rotor core 30 has a negative balancing section 78, which is formed in a hollow shape at a position eccentric to the outer surface of the rotor core 30 from its central section to its radial side. Therefore, the imbalance of the rotating body can be corrected not only by the first counterweight and the second counterweight 64, but also by the negative balancing section 78. Consequently, the size of the first counterweight and the second counterweight 64 can be reduced compared to a case in which the rotor core 30, for example, does not have a negative balancing section 78.

[0100] Furthermore, according to the present embodiment, the negative compensation section 78 is formed in a position that avoids the magnetic path generated by the rotor magnet 32. Therefore, the area for the magnetic path can be ensured compared to a case in which, for example, at least a portion of the negative compensation section 78 is formed within the magnetic path generated by the rotor magnet 32. Consequently, a deterioration of the properties of the motor unit 12 can be suppressed.

[0101] Furthermore, according to the present embodiment, the radial direction extension section 86 is arranged in the axial direction of the motor unit 12 in the space 100 between the stator 18 and the compressor housing 34. The space 100 is a dead space. Therefore, an increase in the size of the compressor 10 in the axial direction can be suppressed even when the counterweight is provided.

[0102] Furthermore, according to the present embodiment, the rotor 60 has the unbalance correction section 80, which includes the first counterweight 62, the second counterweight 64, and the negative counterweight section 78. The unbalance correction section 80 provides the unbalance correction amount that corrects the unbalance caused by the movable spiral 38. Therefore, the unbalance in the rotating body, which includes the rotor 60 and the movable spiral 38, can be corrected. Consequently, the occurrence of noise and similar phenomena accompanying the rotation of the rotating body can be suppressed.

[0103] Furthermore, according to the present embodiment, the connecting section between the axial extension section 84 and the fixing section 82 (i.e., the end section 82A on the outer circumferential side of the fixing section 82) is positioned further inward than the outer shape of the rotor core 30. Therefore, the fixing section 82 can be prevented from interfering with the stator core 24, which is located on the outside in the radial direction of the rotor core 30. In addition, the end section 86A on the outer circumferential side of the radial extension section 86 is positioned further inward than the outer shape of the stator core 24. Therefore, the radial extension section 86 can be prevented from interfering with the motor housing 16 and similar components located on the outside in the radial direction of the stator core 24.

[0104] Fig. Figure 9 is a diagram comparing the axial lengths of two types of rotors 60. The rotor 60 shown on the left side in Fig. As shown in Figure 9, the first counterweight 62 and the second counterweight 64 are each formed in a block shape. Furthermore, the first counterweight 62 and the second counterweight 64 are each fixed to the rotor core 30 by a rivet 104. The rotor 60, which is located on a right side in Fig. Figure 9 shows the rotor, which is in Fig. 1 to Fig. 8 is shown. As a result of the rotor 60, which is on the right side in Fig. As shown in 9, an axial length L can be compared to the rotor 60, which is on the left side in Fig. As shown in 9, it can be shortened.

[0105] Next, modifications according to the present embodiment will be described.

[0106] Fig. Figure 10 is a longitudinal sectional view of a first modification of a combination of the first counterweight 62 and the second counterweight 64. In the first modification, which is shown in Fig. As shown in Figure 10, the first counterweight 62 is formed in a block shape. The first counterweight 62 can have the same shape as the second counterweight 64 or a different shape.

[0107] Fig. Figure 11 is a longitudinal sectional view of a second modification of the combination of the first counterweight 62 and the second counterweight 64. In the second modification, which is shown in Fig. As shown in Figure 11, the configuration is such that a section from the first counterweight 62 to the radial direction extension section 86 is omitted and the first counterweight 62 has the fixing section 82 and the axial direction extension section 84.

[0108] Fig. Figure 12 is a longitudinal sectional view of a third modification of the combination of the first counterweight 62 and the second counterweight 64. In the third modification, which is shown in Fig. As shown in Figure 12, the configuration is such that the second counterweight 64 has a fixing section 112 and an axial extension section 114. The fixing section 112 is an example of the "second fixing section" of the present disclosure. The axial extension section 114 is an example of the "second axial extension section" of the present disclosure. The fixing section 112 is fixed to the end face on the opposite side in the axial direction of the rotor core 30 with the second cover plate 68 between them. The axial extension section 114 extends from an end section on an outer circumferential side of the fixing section 112 to the outer side in the axial direction of the rotor core 30.

[0109] Fig. Figure 13 is a longitudinal sectional view of a fourth modification of the combination of the first counterweight 62 and the second counterweight 64. In the fourth modification, which is shown in Fig. As shown in Figure 13, the configuration is such that the first counterweight 62 has the fixing section 82 and the axial direction extension section 84. The configuration is further such that the second counterweight 64, in a manner similar to the first counterweight 62, also has the fixing section 112 and the axial direction extension section 114.

[0110] Fig. Figure 14 is a longitudinal sectional view of a fifth modification of the combination of the first counterweight 62 and the second counterweight 64. In the fifth modification, which is shown in Fig. As shown in Figure 14, the second counterweight 64 has a radial extension section 116. The radial extension section 116 is an example of the “second radial extension section” of the present disclosure. The radial extension section 116 extends from the end section at the tip end face of the axial extension section 84 to the outside in the radial direction of the rotor core 30. The radial extension section 116 is arranged in a space 106 between the stator 18 and a bottom section of the motor housing 16. The space 106 is a dead space formed in the axial direction of the motor unit 12 between the stator 18 and the compressor housing 34.

[0111] As a result of such a configuration, the imbalance of the rotating body can be corrected by, for example, adjusting the length of the fixing section 112 along the radial direction of the rotor core 30, the length of the axial direction extension section 114 along the axial direction of the rotor core 30, the length of the radial direction extension section 116 along the radial direction of the rotor core 30, and similar adjustments. Consequently, the imbalance of the rotating body can be easily corrected.

[0112] Fig. Figure 15 is a longitudinal sectional view of a first modification of the shape of the first counterweight 62. In the first modification, which is shown in Fig. As shown in Figure 15, instead of the shaft insertion hole 88, a notch 120, in which the shaft 22 is inserted, is formed in a semicircular shape. The first counterweight 62 can be fixed to the rotor core 30 by a rivet (not shown) which is inserted in the positioning hole 92 and pressed into a rivet hole formed in the rotor core 30.

[0113] Fig. Figure 16 is a longitudinal sectional view of a second modification of the shape of the first counterweight 62. In the second modification, which is shown in Fig. As shown in Figure 16, the fixing section 82 is circular in shape. Furthermore, the axial extension section 84 and the radial extension section 86 are each circular arcs along the circumferential direction of the rotor core 30. As a result of this configuration, the dimensions of the axial extension section 84 and the radial extension section 86 can be increased compared to a case where, for example, the axial extension section 84 and the radial extension section 86 are rectangular. Consequently, the amount of imbalance correction provided by the first counterweight 62 can be increased. Notches can be formed at appropriate locations in the radial extension section 86 to create notched and raised tabs within the radial extension section 86.

[0114] Fig. 17 is a longitudinal sectional view of a third modification of the shape of the first counterweight 62. In the third modification, which is shown in Fig. As shown in Figure 17, the fixing section 82 in the second modification, which is in Fig. As shown in Figure 16, the notch 120, in which the shaft 22 is inserted, is formed in a semicircular shape at the fixing section 82, instead of the shaft insertion hole 88.

[0115] Fig. 18 is a longitudinal sectional view of a fourth modification of the shape of the first counterweight 62. In the fourth modification, which is shown in Fig. As shown in Figure 18, the configuration is such that a section from the first counterweight 62 to the radial direction extension section 86 is omitted and the first counterweight 62 has the fixing section 82 and the axial direction extension section 84.

[0116] Fig. 19 is a longitudinal sectional view of a fifth modification of the shape of the first counterweight 62. In the fifth modification, which is shown in Fig. As shown in Figure 19, the notch 120, in which the shaft 22 is inserted, replaces the shaft insertion hole 88 in the fourth modification shown in Figure 19. Fig. As shown in 18, it is formed in a semicircular shape.

[0117] Fig. Figure 20 is a longitudinal sectional view of a sixth modification of the shape of the first counterweight 62. In the sixth modification, which is shown in Fig. As shown in Figure 20, the configuration is such that a section from the first counterweight 62 to the radial direction extension section 86 is omitted, and the first counterweight 62 in the second modification, which is shown in Fig. Figure 16 shows the fixing section 82 and the axial direction extension section 84. Notches can be formed at suitable locations in the axial direction extension section 84 to create incised and raised tabs in the axial direction extension section 84.

[0118] Fig. Figure 21 is a longitudinal sectional view of a seventh modification of the shape of the first counterweight 62. In the seventh modification, which is shown in Fig. As shown in 21, the fixing section 82 in the sixth modification, which is in Fig. 20 is shown in a semicircular shape. Furthermore, instead of the shaft insertion hole 88, the notch 120, in which the shaft 22 is inserted, is formed in a semicircular shape at the fixing section 82.

[0119] Fig. Figure 22 is a longitudinal section view of a modification of the configuration of the negative adjustment section 78. In the modification shown in Fig. As shown in Figure 22, the negative compensation section 78 has a first negative compensation section 122, which is open at the end surface on one side in the axial direction of the rotor core 30, and a second negative compensation section 124, which is open at the end surface on the other side in the axial direction of the rotor core 30.

[0120] The first negative compensation section 122 and the second negative compensation section 124 terminate at the same position in the axial direction of the rotor core 24. The depth Y of the second negative compensation section 124 is chosen to a value obtained by subtracting the depth X of the first negative compensation section 122 from the axial length Z of the rotor core 30. Here, the first negative compensation section 122 and the second negative compensation section 124 can terminate at different positions in the axial direction of the rotor core 30. Furthermore, the first negative compensation section 122 and the second negative compensation section 124 can each extend through the axial direction of the rotor core 30.

[0121] As a result of such a configuration, the imbalance of the rotating body can be corrected by both the first negative balancing section 122 and the second negative balancing section 124. Consequently, the imbalance of the rotating body can be corrected more easily compared to a case in which the negative balancing section 78, for example, only has one of the first negative balancing section 122 and the second negative balancing section 124.

[0122] Fig. Figure 23 is a graph showing a relationship between the depth X of the first negative adjustment section 122 and the rotational imbalance correction amount. In the example shown in Fig. As shown in Figure 23, the depth X of the first negative balancing section 122 is determined by the rotational unbalance correction amounts of the first balancing weight 62 and the second balancing weight 64 as fixed values. Graphs G3 and G4 show the relationships between the depth X of the first balancing weight 62 and the rotational unbalance correction amount of the negative balancing section 78. The rotor 30 is configured by a plurality of core layers that are stacked. Graph G3 shows a case in which the core layers, in which the first negative balancing section 122 is formed, are not rotated and stacked. Graph G4 shows a case in which the core layers, in which the first negative balancing section 122 is formed, are rotated and stacked.

[0123] Here, a difference arises between the rotational imbalance correction amounts due to the first balancing weight 62 and the second balancing weight 64 and the rotational imbalance correction amount due to the negative balancing section 78 due to an effect of the keyway 90 on one side in the axial direction of the rotor core 30.

[0124] As shown in graph G3, the depth X of the first negative balancing section 122 and the rotational imbalance correction amount through the negative balancing section 78 are proportional when the core layers are not rotated and stacked. However, as shown in graph G4, the rotational imbalance correction amount through the negative balancing section 78 changes to have a local minimum value when the depth X of the first negative balancing section 122 increases as the core layers are rotated and stacked. In this way, the rotational imbalance correction amount through the negative balancing section 78 can be adjusted by rotating and stacking the core layers.

[0125] Fig. Figure 24 is a graph showing a relationship between the depth X of the first negative adjustment section 122 and the moment imbalance correction amount. In an example shown in Fig. As shown in Figure 24, the depth X of the first negative balancing section 122 is determined by the moment imbalance correction amounts due to the first balancing weight 62 and the second balancing weight 64 as fixed values. Graphs G5 and G6 show a relationship between the depth X of the first balancing weight 62 and the moment imbalance correction amount due to the negative balancing section 78. Graph G5 shows a case in which the core positions where the first negative balancing section 122 is formed are not rotated and stacked. Graph G6 shows a case in which the core positions where the first negative balancing section 122 is formed are rotated and stacked.

[0126] Here, a difference occurs between the moment imbalance correction amounts due to the first balancing weight 62 and the second balancing weight 64 and the moment imbalance correction amount due to the negative balancing section 78 because of an effect of the keyway 90 on one side in the axial direction of the rotor core 30.

[0127] As shown in graph G5, the depth X of the first negative balancing section 122 and the moment unbalance correction amount through the negative balancing section 78 are proportional when the core layers are not rotated and stacked. However, as shown in graph G6, the moment unbalance correction amount through the negative balancing section 78 changes to have a local minimum value when the depth X of the first negative balancing section 122 increases as the core layers are rotated and stacked. In this way, the moment unbalance correction amount through the negative balancing section 78 can be adjusted by rotating and stacking the core layers.

[0128] Fig. Figure 25 is a longitudinal section view of a first modification of the shape of the negative adjustment section 78. In the modification shown in Fig. As shown in Figure 25, a section 78A of the negative compensation section 78 is formed at a position corresponding to a central section in a lateral direction of the rotor magnet 32 ​​(or, in other words, the magnet receiving hole 76). The lateral direction of the rotor magnet 32 ​​is a direction along a tangential direction of the rotor core 30. The section 78A of the negative compensation section 78 is formed in a recess shape. The section 78A of the negative compensation section 78 is formed at a position that avoids the magnetic path generated by the rotor magnet 32.

[0129] As a result of a configuration such as this, section 78A of the negative balancing section 78 can be positioned further on the outside in the radial direction of the rotor core 30, while section 78A of the negative balancing section 78 is prevented from being formed in the magnetic path generated by the rotor magnet 32.

[0130] Here, the entire negative compensation section 78 can be formed at the position that corresponds to the middle section in the lateral width direction of the rotor magnet 32.

[0131] Fig. Figure 26 is a longitudinal sectional view of a second modification of the shape of the negative adjustment section 78. In the modification shown in Fig. As shown in Figure 26, section 78A of the negative compensation section 78 is formed in a position corresponding to a section between adjacent rotor magnets 32 (in other words, adjacent magnet receiving holes 76). Section 78A of the negative compensation section 78 is formed in a recess shape. Section 78A is formed in a position that avoids the magnetic path generated by the rotor magnet 32. A virtual line H is a line of outermost diameter of the position that avoids the magnetic path generated by the rotor magnet 32. The negative compensation section 78 is formed further on the inside in the radial direction of the rotor core 30 than the virtual line H.

[0132] As a result of a configuration such as this, section 78A of the negative balancing section 78 can be positioned further on the outside in the radial direction of the rotor core 30, while section 78A of the negative balancing section 78 is prevented from being formed in the magnetic path generated by the rotor magnet 32.

[0133] Here, the entire negative compensation section 78 can be formed at the position that corresponds to the section between adjacent rotor magnets 32.

[0134] Fig. 27 is a first modification of the fixing section 82 of the first counterweight 62. In the first modification, which is in Fig. As shown in Figure 27, the fixing section 82, which is arranged in a position that seals the magnet receiving hole 76, has a magnet cooling hole 126A. The magnet cooling hole 126A is formed in a position that, when viewed from the axial direction of the rotor core 30, is adjacent to the rotor magnet 32 ​​and extends through the fixing section 82 in a plate thickness direction. As an example, the magnet cooling hole 126A is formed in a position adjacent to an end section in the lateral width direction of the rotor magnet 32. Although not shown, a magnet cooling hole connected to the magnet cooling hole 126A can also be found here in the first cover plate 66 (see Figure 27). Fig. 1 and similar) are formed, which is arranged between the fixing section 82 and the rotor core 30. As a result of such a configuration, the rotor magnet 32 ​​can be cooled by conveying a fluid to the magnet cooling hole 126A.

[0135] Fig. Figure 28 is a longitudinal sectional view of a second modification of the fixing section 82 of the first counterweight 62. In the second modification, which is shown in Fig. As shown in Figure 28, the fixing section 82, which is arranged in a position that seals the magnet receiving hole 76, has a magnet cooling hole 126B in addition to the magnet cooling hole 126A. The magnet cooling hole 126B is formed in a position that, when viewed from the axial direction of the rotor core 30, is adjacent to the rotor magnet 32 ​​and extends through the plate thickness direction of the fixing section 82. As an example, the magnet cooling hole 126B is formed in a position adjacent to the central section in the lateral width direction of the rotor magnet 32. Although not shown, a magnet cooling hole connected to the magnet cooling hole 126B can also be found here in the first cover plate 66 (see Figure 28). Fig. 1 and similar) are formed, which is arranged between the fixing section 82 and the rotor core 30. As a result of such a configuration, the rotor magnet 32 ​​can be cooled by conveying a fluid to the magnet cooling hole 126B.

[0136] Fig. Figure 29 is a perspective exploded view of a first modification of the rotor 60 configuration. In the first modification, which is shown in Fig. As shown in Figure 29, the second counterweight 64 is arranged on the same side as the axial extension section 84 and the radial extension section 86 of the first counterweight 62. The negative counterweight section 78 is formed on a side opposite the axial extension section 84 and the radial extension section 86 of the first counterweight 62.

[0137] The example that is in Fig. Figure 29 is an example. The corresponding positions of the first counterweight 62, the second counterweight 64 and the negative counterweight section 78 are chosen in the circumferential direction of the rotor core 30 such that the unbalance correction amount by the first counterweight 62, the unbalance correction amount by the second counterweight 64 and the unbalance correction amount by the negative counterweight section 78 are balanced with the unbalance due to the movable spiral 38.

[0138] Fig. Figure 30 is a perspective view of a second modification of the rotor configuration 60. In the second modification, which is shown in Fig. As shown in Figure 30, the first counterweight 62 is formed in a block shape. The first counterweight 62 can have the same shape as the second counterweight 64 or a different shape. As an example, the first counterweight 62 is arranged on a side opposite the second counterweight 64. In the example shown in Fig. As shown in Figure 30, the negative balancing section 78 can be arranged on the same side as the first balancing weight 62 or on the same side as the second balancing weight 64.

[0139] Here, the rotor 60, according to the embodiment described above, has the first counterweight 62, the second counterweight 64, and the negative counterweight section 78. However, one or two of the first counterweight 62, the second counterweight 64, and the negative counterweight section 78 may be omitted.

[0140] Furthermore, the rotor 60, which has the first counterweight 62, the second counterweight 64 and the negative counterweight section 78, is applied to the compressor 10 according to the embodiment described above, but can also be applied to devices that are different from the compressor 10.

[0141] Furthermore, among the multitude of modifications described above, modifications that can be combined can be appropriately combined.

[0142] The present embodiment is described above. However, the present disclosure is not limited to what is described above and can, of course, be modified in various ways in addition to what is described above without departing from the core of the present disclosure.

[0143] The present embodiment is supplemented as follows: [Supplementary Note 1]

[0144] Rotor (60) comprising: a rotor core (30); a first counterweight (62) provided on an end face on one side in an axial direction of the rotor core; and a second counterweight (64) provided on an end face on the other side in the axial direction of the rotor core. [Supplementary Note 2]

[0145] Rotor according to supplementary note 1, wherein: the first counterweight has a first fixing section (82) fixed to the end face on one side in the axial direction of the rotor core, and a first axial direction extension section (84) extending from an end section on an outer circumferential side of the first fixing section to one side in the axial direction of the rotor core. [Supplementary Note 3]

[0146] Rotor according to supplementary note 2, wherein: the first counterweight has a first radial direction extension section (86) extending from an end section on a tip end side of the first axial direction extension section to an outside in a radial direction of the rotor core. [Supplementary Note 4]

[0147] Rotor according to supplementary note 3, wherein: the length of the first radial direction extension section along the radial direction of the rotor core is longer than the length of the first axial direction extension section along the axial direction of the rotor core. [Supplementary Note 5]

[0148] Rotor according to one of the supplementary notes 2 to 4, wherein: the thickness of the first fixing section along the axial direction of the rotor core is thinner than the thickness of the second counterweight along the axial direction of the rotor core. [Supplementary Note 6]

[0149] Rotor according to one of the supplementary notes 2 to 5, wherein: the first fixing section and the first axial direction extension section are formed in plate shapes. [Supplementary Note 7]

[0150] Rotor according to one of Supplementary Notes 3, 4 and Supplementary Note 5 or 6, which depend on Supplementary Note 3, wherein: the first fixing section, the first axial direction extension section and the first radial direction extension section are formed in plate shapes. [Supplementary Note 8]

[0151] Rotor according to one of the supplementary notes 2 to 7, wherein: the first axial direction extension section is formed in a circular arc shape along a circumferential direction of the rotor core. [Supplementary Note 9]

[0152] Rotor according to one of the supplementary notes 3, 4 and the supplementary notes 5 to 7, which depend on supplementary note 3, wherein: the first axial direction extension section and the first radial direction extension section are each formed in a circular arc shape along the circumferential direction of the rotor core. [Supplementary Note 10]

[0153] Rotor according to one of the supplementary notes 1 to 9, wherein: the rotor core has a shaft insertion hole (74) formed in a central section of the rotor core in which a shaft is inserted, and the first counterweight has a positioning section (90, 92) which positions the first counterweight with respect to the shaft. [Supplementary Note 11]

[0154] Rotor according to one of the supplementary notes 1 to 10, wherein: the rotor core has a negative compensating section (78) which is formed in a hollow shape at a position that is eccentric from a central section of the rotor core to an outer side in a radial direction of the rotor core. [Supplementary Note 12]

[0155] Rotor according to supplementary note 11, wherein: the rotor has a rotor magnet (32) which is provided in a position which is further on the outside in the radial direction of the rotor core than the negative compensation section, and the negative compensation section is formed in a position which avoids a magnetic path which is generated by the rotor magnet. [Supplementary Note 13]

[0156] Rotor according to supplementary note 11 or 12, wherein: the rotor has a rotor magnet which is provided in a position which is further on the outside in the radial direction of the rotor core than the negative compensation section, and at least one section of the negative compensation section is formed in a position which corresponds in a lateral width direction to a middle section of the rotor magnet. [Supplementary Note 14]

[0157] Rotor according to one of the supplementary notes 11 to 13, wherein: the rotor has a plurality of rotor magnets provided at positions which are further on the outside in the radial direction of the rotor core than the negative compensation section, the plurality of rotor magnets are arranged to be aligned in a circumferential direction of the rotor, and at least one section of the negative compensation section is formed at a position which corresponds to a section between adjacent rotor magnets. [Supplementary Note 15]

[0158] Rotor according to one of the supplementary notes 11 to 14, wherein: the negative compensation section has a first negative compensation section which is open at an end face on one side in the axial direction of the rotor core, and a second negative compensation section which is open at an end face on the other side in the axial direction of the rotor core. [Supplementary Note 16]

[0159] Rotor according to one of the supplementary notes 3 to 15, which depend on supplementary note 2, wherein: the rotor core has a magnet receiving hole which is open at an end face on one side in the axial direction of the rotor core and receives a rotor magnet, the magnet receiving hole is sealed by the first fixing section and the first fixing section has a magnet cooling hole (126A, 126B) which is formed at a position which, when viewed from the axial direction of the rotor core, is next to the rotor magnet. [Supplementary Note 17]

[0160] Rotor according to one of the supplementary notes 1 to 16, wherein: the second counterweight has a second fixing section (112) fixed at an end face on the other side in the axial direction of the rotor core, a second axial direction extension section (114) extending from an end section on an outer circumferential side of the second fixing section in the axial direction of the rotor core to the other side, and a second radial direction extension section (116) extending from an end section on a tip end face of the second axial direction extension section in a radial direction of the rotor core to an outside. [Supplementary Note 18]

[0161] Compressor comprising: a motor unit (12); and a compressor unit (14) provided on one side in an axial direction of the motor unit, the motor unit comprising a motor housing (16), a stator (18) fixed to an inner side of the motor housing, a rotor (60) rotatably provided on an inner side of the stator, and a shaft (22) provided at a central section of the rotor; the compressor unit comprising a compressor housing (34) assembled with the motor housing, a stationary spiral (36) fixed to an inner side of the compressor housing, and a movable spiral (38) fixed in an eccentric state on the shaft and rotatably provided with respect to the stationary spiral; the rotor comprising a rotor core (30) and a counterweight (62) provided at an end face on one side in an axial direction of the rotor core.the counterweight has a fixing section (82) which is fixed to an end face on one side in the axial direction of the rotor core, an axial direction extension section (84) which extends from an end section on one side in an axial direction of the fixing section to a side in the axial direction of the rotor core, and a radial direction extension section (86) which extends from an end section on a tip end face of the axial direction extension section to an outside in a radial direction of the rotor core, and the radial direction extension section is arranged in an axial direction of the motor unit in a space (100) between the stator and the compressor housing. [Supplementary Note 19]

[0162] Compressor according to Supplementary Note 18, wherein: the rotor has an imbalance correction section (80) which includes the counterweight, and the imbalance correction section has an imbalance correction amount which counteracts an imbalance due to the movable spiral. [Supplementary Note 20]

[0163] Compressor according to Supplementary Note 18 or 19, wherein: the stator has a stator core (24) arranged on the outside in the radial direction of the rotor core, a connecting section between the axial direction extension section and the first fixing section is positioned further on an inside than an outside form of the rotor core, and an end section is positioned on an outside circumferential side of the radial direction extension section further on an inside than an outside form of the stator core. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2023-049052

[0001] JP 2020-105933 A

[0003]

Claims

[1] Rotor (60) with: a rotor core (30); a first counterweight (62) provided at an end face on one side in an axial direction of the rotor core; and a second counterweight (64) which is provided at an end face on the other side in the axial direction of the rotor core. [2] Rotor according to claim 1, wherein: the first counterweight a first fixing section (82) which is fixed to the end surface on one side in the axial direction of the rotor core, and having a first axial direction extension section (84) which extends from an end section on an outer circumferential side of the first fixing section to a side in the axial direction of the rotor core. [3] Rotor according to claim 2, wherein: the first counterweight a first has a radial direction extension section (86) which extends from an end section on a tip end side of the first axial direction extension section to an outside in a radial direction of the rotor core. [4] Rotor according to claim 3, wherein: The length of the first radial direction extension section along the radial direction of the rotor core is longer than the length of the first axial direction extension section along the axial direction of the rotor core. [5] Rotor according to any one of claims 2 to 4, wherein: The thickness of the first fixing section along the axial direction of the rotor core is thinner than the thickness of the second counterweight along the axial direction of the rotor core. [6] Rotor according to any one of claims 2 to 5, wherein: The first fixing section and the first axial direction extension section are formed in plate shapes. [7] Rotor according to one of claim 3, claim 4 and claim 5 or 6, which are dependent on claim 3, wherein: the first fixing section, the first axial direction extension section and the first radial direction extension section are formed in plate shapes. [8] Rotor according to any one of claims 2 to 7, wherein: The first axial direction extension section is formed in a circular arc shape along a circumferential direction of the rotor core. [9] Rotor according to one of claims 3, 4 and 5 to 7, which are dependent on claim 3, wherein: the first axial direction extension section and the first radial direction extension section are each formed in a circular arc shape along the circumferential direction of the rotor core. [10] Rotor according to any one of claims 1 to 9, wherein: the rotor core has a shaft insertion hole (74) which is formed in a central section of the rotor core and in which a shaft is inserted, and the first counterweight has a positioning section (90, 92) that positions the first counterweight with respect to the shaft. [11] Rotor according to any one of claims 1 to 10, wherein: the rotor core has a negative compensation section (78) which is formed in a hollow shape at a position that is eccentric from a central section of the rotor core to an outer side in a radial direction of the rotor core. [12] Rotor according to claim 11, wherein: the rotor has a rotor magnet (32) which is provided in a position that is further on the outside in the radial direction of the rotor core than the negative compensation section, and the negative compensation section is formed at a position that avoids a magnetic path generated by the rotor magnet. [13] Rotor according to claim 11 or 12, wherein: the rotor has a rotor magnet which is positioned further outwards in the radial direction of the rotor core than the negative balancing section, and at least one section of the negative compensation section is formed at a position that corresponds to a middle section of the rotor magnet in a lateral width direction. [14] Rotor according to any one of claims 11 to 13, wherein: the rotor has a multitude of rotor magnets which are provided at positions that are further outwards in the radial direction of the rotor core than the negative balancing section, the multitude of rotor magnets are arranged to be aligned in a circumferential direction of the rotor, and at least one section of the negative compensation section is formed at a position that corresponds to a section between adjacent rotor magnets. [15] Rotor according to any one of claims 11 to 14, wherein: the negative adjustment section a first negative compensation section, which is open at an end face on one side in the axial direction of the rotor core, and has a second negative compensation section that is open at an end face on the other side in the axial direction of the rotor core. [16] Rotor according to any one of claims 3 to 15, which depend on claim 2, wherein: the rotor core has a magnet receiving hole that is open on one end face on one side in the axial direction of the rotor core and receives a rotor magnet, the magnet mounting hole is sealed by the first fixing section and the first fixing section has a magnetic cooling hole (126A, 126B) which is formed in a position which, when viewed from the axial direction of the rotor core, is next to the rotor magnet. [17] Rotor according to any one of claims 1 to 16, wherein: the second counterweight a second fixing section (112) which is fixed to an end face on the other side in the axial direction of the rotor core, a second axial direction extension section (114) extending from an end section on an outer circumferential side of the second fixing section in the axial direction of the rotor core to the other side, and a second radial direction extension section (116) which extends from an end section on a tip end side of the second axial direction extension section in a radial direction of the rotor core to an outside. [18] Compressors with: a motor unit (12); and a compressor unit (14) which is provided on one side in an axial direction of the motor unit, wherein the engine unit a motor housing (16), a stator (18) which is fixed to an inside of the motor housing, a rotor (60) which is provided to be rotatable on an inner side of the stator, and a shaft (22) which is provided at a central section of the rotor, the compressor unit a compressor housing (34) which is assembled with the motor housing, a stationary spiral (36) which is fixed to an inside of the compressor housing, and a movable spiral (38) which is fixed to the shaft in an eccentric state and is rotatable with respect to the stationary spiral, the rotor a rotor core (30) and a counterweight (62) which is provided on an end face on one side in an axial direction of the rotor core, the counterweight a fixing section (82) which is fixed to an end face on one side in the axial direction of the rotor core, an axial direction extension section (84) extending from an end section on one side in an axial direction of the fixing section to a side in the axial direction of the rotor core, and a radial direction extension section (86) extending from an end section on a tip end face of the axial direction extension section to an outside in a radial direction of the rotor core, and the radial direction extension section is arranged in an axial direction of the motor unit in a space (100) between the stator and the compressor housing. [19] Compressor according to claim 18, wherein: the rotor has an imbalance correction section (80) which includes the counterweight, and The imbalance correction section has an imbalance correction amount that counteracts an imbalance due to the movable spiral. [20] Compressor according to claim 18 or 19, wherein: the stator has a stator core (24) which is arranged on the outside in the radial direction of the rotor core, a connecting section between the axial direction extension section and the first fixing section is positioned further on an inside than an outside form of the rotor core and an end section on an outer circumferential side of the radial direction extension section is positioned further on an inner side than an outer form of the stator core.

Images