Rotor and compressor

Abstract

A rotor (60) includes: a rotor core (30); a first balance weight (62) provided on an end surface on one side in the axial direction of the rotor core (30); and a second balance weight (64) provided on the other end surface of the rotor core (30) in the axial direction.

Description

Citation of relevant applications

[0001] This application claims priority to Japanese Patent Application No. 2023-049052, filed on March 24, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to a rotor and a compressor. Background Technology

[0003] A scroll compressor is disclosed in Japanese Patent Application Publication No. 2020-105933. Summary of the Invention

[0004] The inventors discovered through detailed research that in scroll compressors, it is desirable to be able to easily correct imbalances in the rotating body containing the rotor.

[0005] In addition, the inventors discovered through detailed research that, even with counterweights, it is sometimes desirable to suppress axial enlargement in scroll compressors.

[0006] The primary objective of this disclosure is to provide a rotor that can easily correct imbalances in a rotating body containing a rotor.

[0007] The second aspect of this disclosure aims to provide a compressor that can suppress axial enlargement even when a counterweight is included.

[0008] The first aspect of this disclosure is a rotor comprising a rotor core, a first counterweight disposed on an end face of one axial side of the rotor core, and a second counterweight disposed on an end face of the other axial side of the rotor core.

[0009] The second aspect of this disclosure is a compressor, which includes an electric motor section and a compressor section disposed on one axial side of the electric motor section. The electric motor section includes: an electric motor housing; a stator fixed to the inner side of the electric motor housing; a rotor rotatably disposed inside the stator; and a shaft disposed at the center of the rotor. The compressor section includes: a compressor housing assembled relative to the electric motor housing; a fixed scroll fixed to the inner side of the compressor housing; and a movable scroll fixed eccentrically relative to the shaft. The aforementioned fixed scroll is arranged in a rotatable manner. The rotor includes: a rotor core; and a counterweight disposed on an axial end face of the rotor core. The counterweight includes: a fixing part fixed to an axial end face of the rotor core; an axial extension part extending from the outer peripheral end of the fixing part toward an axial side of the rotor core; and a radial extension part extending from the front end of the axial extension part toward a radially outward side of the rotor core. The radial extension part is disposed in the space between the stator and the compressor housing in the axial direction of the motor unit.

[0010] According to a first aspect of this disclosure, a rotor is provided that can easily correct imbalances in a rotating body containing a rotor.

[0011] According to a second aspect of this disclosure, a compressor capable of suppressing axial enlargement is provided even when a counterweight is included. Attached Figure Description

[0012] Figure 1 This is a longitudinal sectional view showing the main parts of a compressor having a rotor according to an embodiment of the present disclosure. Figure 2 This is an exploded perspective view of a rotor according to one embodiment of the present disclosure. Figure 3 This is a perspective view of a rotor according to one embodiment of the present disclosure. Figure 4 This is a perspective view of the first balancing weight according to one embodiment of the present disclosure. Figure 5 These are two views of the first balancing weight according to one embodiment of this disclosure. Figure 6 This is a view of the rotor core of one embodiment of the present disclosure from the axial side. Figure 7 This is a graph showing the relationship between the thickness of the second balancing weight and the amount of rotational imbalance correction according to an embodiment of the present disclosure. Figure 8This is a graph showing the relationship between the thickness of the second balancing weight and the torque imbalance correction amount in one embodiment of the present disclosure. Figure 9 This is a diagram comparing the shaft lengths of two types of rotors. Figure 10 This is a longitudinal sectional view showing a first variant example of the combination of the first and second balancing weights. Figure 11 This is a longitudinal sectional view showing a second variation of the combination of the first and second balancing weights. Figure 12 This is a longitudinal sectional view showing a third variation of the combination of the first and second balancing weights. Figure 13 This is a longitudinal sectional view showing a fourth variation of the combination of the first and second balancing weights. Figure 14 This is a longitudinal sectional view showing a fifth variation of the combination of the first and second balancing weights. Figure 15 This is a longitudinal sectional view showing a first modified example of the shape of the first balancing counterweight. Figure 16 This is a longitudinal sectional view showing a second variation of the shape of the first balancing weight. Figure 17 This is a longitudinal sectional view showing a third variation of the shape of the first balancing weight. Figure 18 This is a longitudinal sectional view showing a fourth variation of the shape of the first balancing weight. Figure 19 This is a longitudinal sectional view showing a fifth variation of the shape of the first balancing weight. Figure 20 This is a longitudinal sectional view showing a sixth variation of the shape of the first balancing weight. Figure 21 This is a longitudinal sectional view showing a seventh variation of the shape of the first balancing weight. Figure 22 This is a longitudinal sectional view showing a modified example of the structure of the negative balance section. Figure 23 It is a graph showing the relationship between the depth of the first negative balance section and the amount of rotational imbalance correction. Figure 24 It is a graph showing the relationship between the depth of the first negative balance section and the torque imbalance correction amount. Figure 25 This is a longitudinal sectional view showing a first modified example of the shape of the negative balance section. Figure 26 This is a longitudinal sectional view showing a second variation of the shape of the negative balance section. Figure 27This is a diagram showing a first modified example of the fixing part of the first balancing weight. Figure 28 This is a diagram showing a second variation of the fixing part of the first balancing weight. Figure 29 This is an exploded perspective view showing a first modified example of the rotor structure. Figure 30 This is an exploded perspective view showing a second modified example of the rotor structure. Figure 31 This is a longitudinal sectional view showing an example of a scroll compressor. Detailed Implementation

[0013] Figure 31 This is a longitudinal sectional view showing an example of a scroll compressor 10. The compressor 10 has an electric motor section 12 and a compressor section 14 disposed on one axial side of the electric motor section 12.

[0014] The motor unit 12 includes: a motor housing 16; a stator 18 fixed to the inside of the motor housing 16; a rotor 20 rotatably disposed on the radially inner side of the stator 18; and a shaft 22 disposed at the center of the rotor 20.

[0015] The stator 18 includes: a stator core 24; an insulator 26 mounted on the stator core 24; and a winding 28 wound around the stator core 24 with respect to the insulator 26. The rotor 20 includes a rotor core 30 and a rotor magnet 32 ​​disposed on the outer peripheral surface of the rotor core 30.

[0016] The compressor unit 14 includes: a compressor housing 34; a fixed scroll 36 fixed to the inside of the compressor housing 34; and a movable scroll 38 arranged in a manner that allows it to rotate relative to the fixed scroll 36. The compressor housing 34 has a first housing 40 assembled relative to the motor housing 16 and a second housing 42 disposed on one axial side of the first housing 40.

[0017] An intake port 44 is formed in the motor housing 16, and an outlet port 46 is formed in the second housing 42. The space between the fixed scroll 36 and the movable scroll 38 forms a compression chamber. The intake port 44 communicates with the compression chamber through the space inside the motor housing 16, and the compression chamber communicates with the outlet port 46 through the flow path formed in the second housing 42.

[0018] 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 of the shaft 22 on one axial side, and a third bearing 54 is provided in the movable scroll 38. The movable scroll 38 is rotatably supported by the third bearing 54 via the eccentric shaft 52 and is fixed in an eccentric state relative to the shaft 22.

[0019] In the compressor 10 with the above-described structure, the shaft 22 and rotor 20 rotate integrally when a rotating magnetic field is formed by the stator 18. Furthermore, as the shaft 22 rotates, the movable scroll 38 rotates, changing the volume of the compression chamber, and the fluid drawn into the compression chamber from the suction port 44 is compressed within the compression chamber. Then, the compressed fluid is discharged from the discharge port 46.

[0020] exist Figure 31 In the compressor 10 shown, the movable scroll 38 is fixed in an off-center state relative to the shaft 22. Therefore, an imbalance occurs in the rotating body including the movable scroll 38, the rotor 20, and the shaft 22 (i.e., the center of gravity of the rotating body deviates from the rotating shaft). As a method to suppress the imbalance of the rotating body, it is considered to install a balancing weight on the shaft 22 or the rotor 20 to correct the imbalance.

[0021] However, it is difficult to correct the imbalance of the rotating body by simply installing a counterweight on the shaft 22 or the rotor 20. In addition, when a counterweight is installed on the shaft 22 or the rotor 20, it is desirable to prevent the compressor 10 from becoming axially larger due to the installation of the counterweight.

[0022] The first objective of this embodiment is to provide a rotor that can easily correct imbalances in a rotating body containing a rotor.

[0023] The second point of view of this embodiment is to provide a compressor that can suppress axial enlargement even when a counterweight is included.

[0024] In order to achieve the objective of the first point of view of this embodiment, the first aspect of this embodiment is a rotor including a rotor core, a first counterweight disposed on one axial side end face of the rotor core, and a second counterweight disposed on the other axial side end face of the rotor core.

[0025] In a first embodiment, the rotor core includes: a first balancing weight disposed on an end face of one axial side of the rotor core; and a second balancing weight disposed on an end face of the other axial side of the rotor core. Therefore, the imbalance of the rotating body containing the rotor can be corrected using both the first and second balancing weights. Thus, compared to, for example, a case where the rotor core includes only either the first or second balancing weight, the imbalance of the rotating body can be easily corrected.

[0026] The rotor of the second embodiment is based on the first embodiment. The first counterweight has: a first fixing part, which is fixed to the end face of the rotor core on one axial side; and a first axial extension part, which extends from the end of the outer peripheral side of the first fixing part toward the axial side of the rotor core.

[0027] In the second embodiment of this invention, the first counterweight includes: a first fixing portion fixed to an end face on one axial side of the rotor core; and a first axial extension portion extending from the outer peripheral end of the first fixing portion toward one axial side of the rotor core. Therefore, for example, by adjusting the length of the first fixing portion along the radial direction of the rotor core and the length of the first axial extension portion along the axial direction of the rotor core, the imbalance of the rotating body can be corrected. Thus, the imbalance of the rotating body can be easily corrected.

[0028] The third-type rotor in this embodiment is based on the second aspect of this embodiment. The first counterweight has a first radial extension, which extends radially outward from the end of the front end of the first axial extension toward the rotor core.

[0029] In the third embodiment of this invention, the first counterweight has a first radial extension that extends radially outward from the end of the first axial extension toward the rotor core. Therefore, for example, by adjusting the length of the first radial extension along the radial direction of the rotor core, the imbalance of the rotating body can be corrected. Thus, the imbalance of the rotating body can be easily corrected.

[0030] The rotor of the fourth embodiment is based on the third embodiment, wherein the radial length of the first radial extension along the rotor core is longer than the axial length of the first axial extension along the rotor core.

[0031] In the fourth embodiment, the radial length of the first radial extension along the rotor core is longer than the axial length of the first axial extension along the rotor core. Therefore, for example, compared to the case where the length of the first radial extension is shorter than the length of the first axial extension, the imbalance correction amount of the first balancing weight can be increased.

[0032] The rotor of the fifth embodiment is based on any one of the second to fourth embodiments of this embodiment, wherein the thickness of the first fixing part along the axial direction of the rotor core is thinner than the thickness of the second balancing weight along the axial direction of the rotor core.

[0033] In the fifth embodiment of this invention, the thickness of the first fixing part along the axial direction of the rotor core is thinner than the thickness of the second balancing weight along the axial direction of the rotor core. Therefore, for example, compared to the case where the thickness of the first fixing part is equal to the thickness of the second balancing weight, the axial length of the rotor can be suppressed.

[0034] The rotor of the sixth embodiment is based on any one of the second to fifth embodiments of this embodiment, wherein the first fixing part and the first axial extension part are formed into a plate shape.

[0035] In the sixth embodiment of this invention, the first fixing portion and the first axial extension portion are formed in a plate shape. Therefore, the shapes of the first fixing portion and the first axial extension portion can be set according to the space around the rotor core, thus increasing the degree of freedom in the arrangement of the first balance weight compared to, for example, the case where the first balance weight is formed in a block shape.

[0036] The rotor of the seventh embodiment is based on any one of the third, fourth, and fifth or sixth embodiments of this embodiment, wherein the first fixing part, the first axial extension part, and the first radial extension part are formed into a plate shape.

[0037] In the seventh embodiment of this invention, the first fixing portion, the first axial extension portion, and the first radial extension portion are formed in a plate shape. Therefore, since the shapes of the first fixing portion, the first axial extension portion, and the first radial extension portion can be set according to the space around the rotor core, the degree of freedom in the arrangement of the first balance weight can be improved compared to, for example, the case where the first balance weight is formed in a block shape.

[0038] The rotor of the eighth embodiment is based on any one of the second to seventh embodiments of this embodiment, wherein the first axial extension is formed as an arc along the circumference of the rotor core.

[0039] In the eighth embodiment of this invention, the first axial extension is formed as an arc along the circumference of the rotor core. Therefore, for example, compared to the case where the first axial extension is formed as a rectangle, the size of the first axial extension can be increased. As a result, the amount of imbalance correction generated by the first balancing weight can be increased.

[0040] The rotor of the ninth embodiment is based on any one of the third, fourth, and fifth to seventh embodiments belonging to the third embodiment, wherein the first axial extension and the first radial extension are respectively formed as arcs along the circumference of the rotor core.

[0041] In the ninth embodiment of this invention, the first axial extension and the first radial extension are each formed as an arc along the circumference of the rotor core. Therefore, for example, compared to the case where the first axial extension and the first radial extension are formed as rectangles, the size of the first axial extension and the first radial extension can be increased. As a result, the amount of imbalance correction generated by the first balancing weight can be increased.

[0042] The rotor of the tenth embodiment is based on any one of the first to ninth embodiments of this embodiment, wherein the rotor core has a shaft insertion hole formed in the center of the rotor core for shaft insertion, and the first counterweight has a positioning part positioned relative to the shaft.

[0043] In the tenth embodiment of this invention, the rotor core has a shaft insertion hole formed at the center of the rotor core for inserting a shaft, and the first counterweight has a positioning part for positioning relative to the shaft. Therefore, since the first counterweight can be positioned relative to the shaft using the positioning part, the accuracy of the imbalance correction amount of the first counterweight can be ensured compared to, for example, the case without a positioning part.

[0044] The rotor of the eleventh embodiment is based on any one of the first to tenth embodiments of this embodiment, wherein the rotor core has a hollow negative balance portion at a position that is radially outward from the center of the rotor core.

[0045] Based on the eleventh aspect of this embodiment, the rotor core has a hollow negative balance portion located radially outward from the center of the rotor core. Therefore, in addition to the first and second counterweights, the negative balance portion can correct the imbalance of the rotating body. Consequently, compared to the case where the rotor core does not have a negative balance portion, the first and second counterweights can be miniaturized.

[0046] The rotor of the twelfth embodiment is based on the eleventh embodiment of this embodiment. The rotor has a rotor magnet disposed at a position further radially outward from the rotor core than the negative balance portion. The negative balance portion is formed at a position that avoids the magnetic circuit of the rotor magnet.

[0047] In the twelfth embodiment of this invention, the negative balance portion is formed at a position that avoids the magnetic circuit of the rotor magnet. Therefore, for example, compared to the case where at least a portion of the negative balance portion is formed in the magnetic circuit of the rotor magnet, the area of ​​the magnetic circuit can be secured. As a result, it is possible to suppress the degradation of the motor's characteristics.

[0048] The rotor of the thirteenth embodiment is based on the eleventh or twelfth embodiment of this embodiment. The rotor has a rotor magnet disposed at a position further radially outward from the rotor core than the negative balance portion. At least a portion of the negative balance portion is formed at a position corresponding to the central portion in the transverse width direction of the rotor magnet.

[0049] In the thirteenth embodiment of this invention, at least a portion of the negative balance section is formed at a position corresponding to the center portion in the transverse width direction of the rotor magnet. Therefore, it is possible to prevent at least a portion of the negative balance section from forming within the magnetic circuit of the rotor magnet, and to position at least a portion of the negative balance section further radially outward from the rotor core. This increases the amount of imbalance correction in the negative balance section.

[0050] The rotor of the fourteenth embodiment is based on any one of the eleventh to thirteenth embodiments of this embodiment. The rotor has a plurality of rotor magnets disposed at a position further radially outward from the rotor core than the negative balance portion. The plurality of rotor magnets are arranged in a circumferential direction of the rotor. At least a portion of the negative balance portion is formed at a position corresponding to the adjacent rotor magnets.

[0051] In the fourteenth embodiment of this invention, at least a portion of the negative balance section is formed at a position corresponding to that of an adjacent rotor magnet. Therefore, it is possible to prevent at least a portion of the negative balance section from forming within the magnetic circuit of the rotor magnet, and to position at least a portion of the negative balance section further radially outward from the rotor core. This increases the amount of imbalance correction in the negative balance section.

[0052] The rotor of the fifteenth embodiment is based on any one of the eleventh to fourteenth embodiments of this embodiment, wherein the negative balance part has a first negative balance part with an end face opening on one axial side of the rotor core and a second negative balance part with an end face opening on the other axial side of the rotor core.

[0053] In the fifteenth embodiment of this invention, the negative balance section has a first negative balance section with an end face opening on one axial side of the rotor core and a second negative balance section with an end face opening on the other axial side of the rotor core. Therefore, the imbalance of the rotating body can be corrected using both the first and second negative balance sections. Thus, for example, compared to the case where the negative balance section includes only either the first or second negative balance section, the imbalance of the rotating body can be easily corrected.

[0054] The rotor of the sixteenth embodiment is based on any one of the third to fifteenth embodiments belonging to the second embodiment of this embodiment. The rotor core has a magnet receiving hole with an end face opening on one axial side of the rotor core and a magnet receiving hole for receiving a rotor magnet. The magnet receiving hole is closed by the first fixing part. The first fixing part has a magnet cooling hole formed at a position adjacent to the rotor magnet when viewed from the axial direction of the rotor core.

[0055] In the sixteenth embodiment of this invention, the first fixing part has a magnet cooling hole formed adjacent to the rotor magnet when viewed axially from the rotor core. Therefore, the rotor magnet can be cooled by fluid flowing into the magnet cooling hole.

[0056] The rotor of the seventeenth embodiment is based on any one of the first to sixteenth embodiments of this embodiment. The second counterweight has: a second fixing part, which is fixed to the end face of the rotor core on the other side of the axial direction; a second axial extension part, which extends from the end of the outer peripheral side of the second fixing part to the other side of the axial direction of the rotor core; and a second radial extension part, which extends from the end of the front end side of the second axial extension part to the radially outer side of the rotor core.

[0057] In the seventeenth embodiment of this invention, the second counterweight includes: a second fixing portion fixed to an end face on the other side of the rotor core along its axial direction; a second axial extension portion extending from the outer peripheral end of the second fixing portion toward the other side of the rotor core along its axial direction; and a second radial extension portion extending from the front end of the second axial extension portion toward the radially outer side of the rotor core. Therefore, for example, by adjusting the radial length of the second fixing portion along the rotor core, the axial length of the second axial extension portion along the rotor core, and the radial length of the second radial extension portion along the rotor core, the imbalance of the rotating body can be corrected. Thus, the imbalance of the rotating body can be easily corrected.

[0058] To achieve the objective of the second viewpoint of this embodiment, the eighteenth aspect of this embodiment is a compressor. The compressor includes an electric motor section and a compressor section disposed on one axial side of the electric motor section. The electric motor section includes: an electric motor housing; a stator fixed to the inner side of the electric motor housing; a rotor rotatably disposed inside the stator; and a shaft disposed at the center of the rotor. The compressor section includes: a compressor housing assembled relative to the electric motor housing; a fixed scroll fixed to the inner side of the compressor housing; and a movable scroll eccentrically positioned relative to the shaft. The rotor, which is fixed in state and rotatable relative to the fixed scroll, includes: a rotor core; and a counterweight disposed on an axial end face of the rotor core. The counterweight includes: a fixing portion fixed to an axial end face of the rotor core; an axial extension portion extending from the outer peripheral end of the fixing portion toward an axial side of the rotor core; and a radial extension portion extending from the front end of the axial extension portion toward a radially outward side of the rotor core. The radial extension portion is disposed in the space between the stator and the compressor housing in the axial direction of the motor unit.

[0059] In the eighteenth embodiment of this invention, the radial extension is disposed in the space between the stator of the motor unit and the compressor housing in the axial direction. Here, the space between the stator of the motor unit and the compressor housing in the axial direction is a dead space. Therefore, even with the inclusion of a counterweight, it is possible to suppress the axial enlargement of the compressor.

[0060] The compressor of the nineteenth embodiment is based on the eighteenth embodiment, wherein the rotor includes an imbalance correction part containing the balance weight, and the imbalance correction part has an imbalance correction amount for correcting the imbalance caused by the movable scroll.

[0061] In the nineteenth embodiment of this invention, the rotor includes an imbalance correction unit comprising a balancing counterweight, and the imbalance correction unit has an imbalance correction amount that corrects the imbalance caused by the movable scroll. Therefore, the imbalance of the rotating body including the rotor and the movable scroll can be corrected, and thus, noise and other noise generated accompanying the rotation of the rotating body can be suppressed.

[0062] The compressor of the twentieth embodiment is based on the eighteenth or nineteenth embodiment of this embodiment. The stator has a stator core disposed radially outside the rotor core. The connection between the axial extension and the first fixing part is located in a position further inward than the outer shape of the rotor core. The outer peripheral end of the radial extension is located in a position further inward than the outer shape of the stator core.

[0063] In the twentieth embodiment, the connection between the axial extension and the first fixing part is located further inward than the outer shape of the rotor core. Therefore, interference between the first fixing part and the stator core disposed radially outward of the rotor core can be suppressed. Furthermore, the outer peripheral end of the radial extension is located further inward than the outer shape of the stator core. Therefore, interference between the radial extension and the motor housing or similar components disposed radially outward of the stator core can be suppressed.

[0064] Figure 1 This is a longitudinal sectional view showing the main parts of the compressor 10, including the rotor 60 of this embodiment. Figure 1 The compressor 10 shown has a structure other than the rotor 60 described below. Figure 31 The compressor 10 shown is the same, therefore, the same compressor 10 is used. Figure 31 Same symbols, but explanations omitted. Figure 2 This is an exploded perspective view of the rotor 60 of this embodiment. Figure 3 This is a perspective view of the rotor 60 in this embodiment.

[0065] The rotor 60 includes 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 a "counterweight" in this disclosure.

[0066] A first cover plate 66 is disposed on one axial end face of the rotor core 30, and a second cover plate 68 is disposed on the other axial end face of the rotor core 30. A shaft insertion hole 70 is formed in the first cover plate 66, and a shaft insertion hole 72 is formed in the second cover plate 68. The first cover plate 66 is fixed relative to the shaft 22 and the rotor core 30 by pressing the shaft 22 into the shaft insertion hole 70. Similarly, the second cover plate 68 is fixed relative to the shaft 22 and the rotor core 30 by pressing the shaft 22 into the shaft insertion hole 72.

[0067] A first counterweight 62 is mounted on one axial end face of the rotor core 30 via a first cover plate 66, and a second counterweight 64 is mounted on the other axial end face of the rotor core 30 via a second cover plate 68. The first counterweight 62 is, for example, made of sheet metal and formed in a plate shape. The second counterweight 64, on the other hand, is formed in a block shape. As an example, the second counterweight 64 is formed in an arc shape along the circumference of the rotor 60 when viewed from the axial direction of the rotor core 30. The second counterweight 64 is fixed relative to the rotor core 30 by pressing or riveting.

[0068] The rotor core 30 has a shaft insertion hole 74, a magnet receiving hole 76, and a negative balance portion 78. The shaft insertion hole 74 is formed at the center of the rotor core 30 and extends through the rotor core 30 in the axial direction. A shaft 22 is inserted (for example, pressed in) into the shaft insertion hole 74, thereby fixing the rotor core 30 to the shaft 22.

[0069] A magnet receiving hole 76 is formed on the outer peripheral surface of the rotor core 30 and extends through the rotor core 30 in the axial direction. A rotor magnet 32 ​​is housed within the magnet receiving hole 76. As an example, the rotor magnet 32 ​​is a bonded magnet. The magnet receiving hole 76 is closed from both axial sides of the rotor core 30 by a first cover plate 66 and a second cover plate 68.

[0070] The first counterweight 62, the second counterweight 64, and the negative balance section 78 are configured to balance the rotor 60, shaft 22, and movable scroll 38 (see reference). Figure 31 The imbalance correction section 80 corrects the imbalance of the rotating body.

[0071] In addition, Figure 1 For convenience, the diagram shows the first balancing weight 62, the second balancing weight 64, and the negative balancing part 78 positioned at the same location in the circumferential direction of the rotor core 30. However, the positions of the first balancing weight 62, the second balancing weight 64, and the negative balancing part 78 in the circumferential direction of the rotor core 30 are set in a manner that corrects the imbalance of the rotating body caused by the movable scroll 38 using the first balancing weight 62, the second balancing weight 64, and the negative balancing part 78.

[0072] exist Figures 1 to 3 In the example shown, the negative balance portion 78 extends axially through the rotor core 30, but it may not extend axially through the rotor core 30. The negative balance portion 78 is formed at a position that is radially outer of the rotor core 30 than the shaft insertion hole 74 and radially inner of the rotor core 30 than the magnet receiving hole 76.

[0073] Figure 4 This is a perspective view of the first balancing weight 62 in this embodiment. Figure 5These are two views of the first balancing weight 62 of this embodiment. The first balancing weight 62 has a fixing part 82, an axially extending part 84, and a radially extending part 86. The fixing part 82 is an example of the "first fixing part" in this disclosure, the axially extending part 84 is an example of the "first axial extending part" in this disclosure, and the radially extending part 86 is an example of the "first radial extending part" in this disclosure.

[0074] The fixing part 82 is fixed to the end face of the rotor core 30 on one axial side via the first cover plate 66. The axial extension part 84 extends from the end 82A on the outer peripheral side of the fixing part 82 toward the axial side of the rotor core 30. The radial extension part 86 extends from the end 84A on the front end side of the axial extension part 84 toward the radially outer side of the rotor core 30.

[0075] The radial extension 86 has a length L1 along the radial direction of the rotor core 30 that is longer than the axial extension 84 has a length L2 along the axial direction of the rotor core 30. The thickness T1 of the fixing part 82 along the axial direction of the rotor core 30 is longer than the thickness T2 of the second counterweight 64 along the axial direction of the rotor core 30 (see reference). Figure 2 )Thin.

[0076] The fixing part 82, the axial extension part 84, and the radial extension part 86 are all rectangular in shape. The fixing part 82 has a shaft insertion hole 88. The shaft insertion hole 88 extends through the fixing part 82 in the thickness direction (i.e., the axial direction of the rotor core 30). A shaft 22 is inserted (for example, pressed in) into the shaft insertion hole 88, thereby fixing the first counterweight 62 to the rotor core 30.

[0077] Additionally, the fixing part 82 has a keyway 90. The keyway 90 is formed into a concave shape at a portion of the circumferential direction of the shaft insertion hole 88. The protrusion formed on the shaft 22 (not shown) engages with the keyway 90, thereby positioning the first counterweight 62 relative to the shaft 22 in the rotational direction. Alternatively, a positioning hole 92 may be formed in the fixing part 82. Moreover, the first counterweight 62 may also be positioned relative to the rotor core 30 by inserting a rivet (not shown) into the positioning hole 92 and pressing the rivet into a rivet hole (not shown) formed on the rotor core 30. The keyway 90 and the positioning hole 92 are examples of a "positioning part" in this disclosure.

[0078] like Figure 1 As shown, a bearing housing portion 94 for accommodating a second bearing 50 is formed in the first housing 40. The bearing housing portion 94 has a bottom surface that faces the axial side of the rotor core 30 relative to the axial side of the motor portion 12. A fixing portion 82 is disposed in the space 96 between the axial side end face of the rotor core 30 and the bottom surface of the bearing housing portion 94.

[0079] Furthermore, the bearing housing 94 has an outer peripheral surface that is radially opposite to the inner peripheral portion of the stator 18 (specifically, the inner peripheral surface of the insulator 26) in the motor section 12. An axial extension 84 is disposed in the space 98 between the inner peripheral portion of the stator 18 and the outer peripheral surface of the bearing housing 94. The space 98 between the inner peripheral portion of the stator 18 and the outer peripheral surface of the bearing housing 94 is a dead zone space formed radially between the stator 18 and the compressor housing 34 in the motor section 12.

[0080] The first housing 40 has a facing surface that is axially opposite to the stator 18 in the motor unit 12. A radial extension 86 is disposed in the space 100 between the facing surfaces of the stator 18 and the first housing 40. The space 100 is a dead zone space formed between the stator 18 and the compressor housing 34 in the axial direction of the motor unit 12.

[0081] Figure 5 The imaginary line A shown represents the outer shape (i.e., the outer peripheral surface) of the rotor core 30. The connection between the axial extension 84 and the fixing part 82 (i.e., the end 82A on the outer peripheral side of the fixing part 82) is located further inward than the outer shape of the rotor core 30. Furthermore, Figure 5 The imaginary line B shown represents the outer shape (i.e., the outer peripheral surface) of the stator core 24. The end 86A of the radial extension 86 on the outer peripheral side is located further inward than the outer shape of the stator core 24.

[0082] Figure 6 This is a view of the rotor core 30 of this embodiment from the axial side. A plurality of magnet receiving holes 76 are formed in the rotor core 30. The plurality of magnet receiving holes 76 are arranged circumferentially along the rotor core 30. When viewed from the axial side of the rotor core 30, each magnet receiving hole 76 extends along the tangential direction of the rotor core 30. Rotor magnet 32 ​​(see reference) Figure 1 It is disposed in the magnet receiving hole 76 at a position further radially outward than the negative balance part 78 of the rotor core 30.

[0083] As an example, when viewed axially from the rotor core 30, if the rotor core 30 is divided into a first region A1 and a second region A2 using a center line, the negative balance portion 78 is formed in the first region A1. Furthermore, the negative balance portion 78 is formed at a position that avoids the magnetic path of the rotor magnet 32. That is, imaginary line C is the outermost diameter line of the position avoiding the magnetic path of the rotor magnet 32, and the negative balance portion 78 is formed at a position further radially inward of the rotor core 30 than imaginary line C. Conversely, imaginary line D is the innermost diameter line that ensures the wall thickness relative to the shaft insertion hole 74, and the negative balance portion 78 is formed at a position further radially outward of the rotor core 30 than imaginary line D.

[0084] Furthermore, when rivet holes 102 are formed in the rotor core 30, a negative balance portion 78 is formed at a position relative to the rivet holes 102 that ensures the wall thickness. That is, the imaginary line E is the outermost diameter line relative to the rivet holes 102 that ensures the wall thickness, and the negative balance portion 78 is formed outside the imaginary line E. Additionally, the imaginary line F is the outermost diameter line of the portion where the wall thickness needs to be ensured to ensure the magnetic circuit, and the negative balance portion 78 is formed outside the imaginary line F.

[0085] Figure 7 This is a graph showing the relationship between the thickness of the second balancing weight 64 in this embodiment and the rotational imbalance correction amount. The rotational imbalance correction amount is an example of "imbalance correction amount" in this disclosure. As a rotational imbalance correction amount used to correct the rotational imbalance caused by the movable scroll 38, the imbalance correction unit 80 has a rotational imbalance correction amount for the first balancing weight 62, a rotational imbalance correction amount for the second balancing weight 64, and a rotational imbalance correction amount for the negative balance unit 78.

[0086] The rotational imbalance correction amount of the negative balance section 78 is equivalent to the rotational imbalance correction amount of the second region A2, which is on the opposite side of the first region A1 where the negative balance section 78 is formed. The rotational imbalance and rotational imbalance correction amount mentioned here are calculated as the product of mass and the radial distance along the rotor core 30 from the rotation axis to the center of gravity. The positions of the first balance weight 62, the second balance weight 64, and the negative balance section 78 in the circumferential direction of the rotor core 30 are set such that the rotational imbalance correction amounts of the first balance weight 62, the second balance weight 64, and the negative balance section 78 are balanced with the rotational imbalance of the movable scroll 38.

[0087] exist Figure 8 In the example shown, the rotational imbalance correction amounts for the first balancing weight 62 and the negative balancing part 78 are set to fixed values, and the thickness of the second balancing weight 64 is determined. Curve G1 shows the relationship between the thickness of the second balancing weight 64 and the rotational imbalance correction amount. When the rotational imbalance of the movable scroll 38 is set as the condition (target value), in order to correct the rotational imbalance of the movable scroll 38, the second balancing weight 64 only needs to have a thickness T2 corresponding to the intersection of curve G1 and the target value.

[0088] Furthermore, while the thickness of the second balancing weight 64 was determined here, it is also possible to determine other dimensions besides the thickness. Additionally, the rotational imbalance correction amounts for the first balancing weight 62 and the negative balancing portion 78 are set to fixed values. However, it is also possible to set the rotational imbalance correction amounts for the second balancing weight 64 and the negative balancing portion 78 to fixed values ​​and determine the dimensions of the first balancing weight 62. Similarly, it is possible to set the rotational imbalance correction amounts for the first balancing weight 62 and the second balancing weight 64 to fixed values ​​and determine the dimensions of the negative balancing portion 78.

[0089] Figure 8 This is a graph showing the relationship between the thickness of the second balancing weight 64 and the torque imbalance correction amount in this embodiment. The torque imbalance correction amount is an example of "imbalance correction amount" in this disclosure. As a torque imbalance correction amount used to correct the torque imbalance of the movable scroll 38, the imbalance correction unit 80 has a torque imbalance correction amount for the first balancing weight 62, a torque imbalance correction amount for the second balancing weight 64, and a torque imbalance correction amount for the negative balance unit 78.

[0090] The torque imbalance correction amount of the negative balance section 78 is equivalent to the torque imbalance correction amount of the second region A2, which is on the opposite side of the first region A1 where the negative balance section 78 is formed. The torque imbalance and torque imbalance correction amount mentioned here are calculated by multiplying the rotational imbalance correction amount by the distance along the axial direction of the rotor core 30 from the first bearing 48 to the center of gravity. The positions of the first balance weight 62, the second balance weight 64, and the negative balance section 78 in the circumferential direction of the rotor core 30 are set such that the torque imbalance correction amounts of the first balance weight 62, the second balance weight 64, and the negative balance section 78 are balanced with the torque imbalance of the movable scroll 38.

[0091] exist Figure 8 In the example shown, the torque imbalance correction amounts for the first balancing weight 62 and the negative balancing part 78 are set to fixed values, and the thickness of the second balancing weight 64 is determined. Curve G2 shows the relationship between the thickness of the second balancing weight 64 and the torque imbalance. When the torque imbalance caused by the movable scroll 38 is set as the condition (target value), in order to correct the torque imbalance caused by the movable scroll 38, the second balancing weight 64 only needs to have a thickness T2 corresponding to the intersection of curve G2 and the target value.

[0092] Furthermore, while the thickness of the second balancing weight 64 was determined here, it is also possible to determine other dimensions besides the thickness. Additionally, the torque imbalance correction amounts for the first balancing weight 62 and the negative balancing part 78 are set to fixed values. However, it is also possible to set the torque imbalance correction amounts for the second balancing weight 64 and the negative balancing part 78 to fixed values ​​and determine the dimensions of the first balancing weight 62. Similarly, it is possible to set the torque imbalance correction amounts for the first balancing weight 62 and the second balancing weight 64 to fixed values ​​and determine the dimensions of the negative balancing part 78.

[0093] Next, the effects of this embodiment will be explained.

[0094] In this embodiment, the rotor core 30 has a first balancing weight 62 disposed on one axial side end face of the rotor core 30 and a second balancing weight 64 disposed on the other axial side end face of the rotor core 30. Therefore, since the imbalance of the rotating body including the rotor 60 can be corrected by both the first balancing weight 62 and the second balancing weight 64, the imbalance of the rotating body can be easily corrected, for example, compared to the case where the rotor core 30 includes only either the first balancing weight 62 or the second balancing weight 64.

[0095] Furthermore, in this embodiment, the first balancing weight 62 includes: a fixing portion 82 fixed to an end face on one axial side of the rotor core 30; an axial extension portion 84 extending from an end 82A on the outer periphery side of the fixing portion 82 toward one axial side of the rotor core 30; and a radial extension portion 86 extending from an end 84 on the front end side of the axial extension portion 84 toward the radially outer side of the rotor core 30. Therefore, for example, by adjusting the radial length of the fixing portion 82 along the rotor core 30, the axial length of the axial extension portion 84 along the rotor core 30, and the radial length of the radial extension portion 86 along the rotor core 30, the imbalance of the rotating body can be corrected. Thus, the imbalance of the rotating body can be easily corrected.

[0096] Furthermore, in this embodiment, the radial length L1 of the radial extension 86 along the rotor core 30 is longer than the axial length L2 of the axial extension 84 along the rotor core 30. Therefore, for example, compared to the case where the length L1 of the radial extension 86 is shorter than the length L2 of the axial extension 84, the amount of imbalance correction of the first balancing weight 62 can be increased.

[0097] Furthermore, in this embodiment, the thickness T1 of the fixing portion 82 along the axial direction of the rotor core 30 is thinner than the thickness T2 of the second balancing weight 64 along the axial direction of the rotor core 30. Therefore, for example, compared to the case where the thickness T1 of the fixing portion 82 is equal to the thickness T2 of the second balancing weight 64, the axial length of the rotor 60 can be suppressed.

[0098] Furthermore, in this embodiment, the fixing portion 82, the axial extension portion 84, and the radial extension portion 86 are formed in a plate shape. Therefore, the shapes of the fixing portion 82, the axial extension portion 84, and the radial extension portion 86 can be set according to the spaces 96, 98, and 100 around the rotor core portion 30. Thus, for example, compared to the case where the first balance weight 62 is formed in a block shape, the degree of freedom in the arrangement of the first balance weight 62 can be increased.

[0099] Furthermore, in this embodiment, the rotor core 30 has a shaft insertion hole 74 formed at the center of the rotor core 30 for inserting the shaft 22, and the first balancing weight 62 has a keyway 90 and a positioning hole 92 positioned relative to the shaft 22. Therefore, the first balancing weight 62 can be positioned relative to the shaft 22 using the keyway 90 and the positioning hole 92, thus ensuring the accuracy of the imbalance correction amount of the first balancing weight 62 compared to the case without the keyway 90 and the positioning hole 92.

[0100] Furthermore, in this embodiment, the rotor core 30 has a hollow negative balance portion 78 formed at a position radially outward from the center of the rotor core 30. Therefore, in addition to the first counterweight and the second counterweight 64, the negative balance portion 78 can also correct the imbalance of the rotating body. Thus, for example, compared to the case where the rotor core 30 does not have the negative balance portion 78, the first counterweight and the second counterweight 64 can be miniaturized.

[0101] Furthermore, in this embodiment, the negative balance portion 78 is formed at a position that avoids the magnetic circuit of the rotor magnet 32. Therefore, for example, compared to the case where at least a portion of the negative balance portion 78 is formed in the magnetic circuit of the rotor magnet 32, the area of ​​the magnetic circuit can be secured. As a result, the degradation of the characteristics of the motor section 12 can be suppressed.

[0102] Furthermore, in this embodiment, the radial extension 86 is disposed in the space 100 between the stator 18 and the compressor housing 34 in the axial direction of the motor unit 12. The space 100 is a dead space. Therefore, even with the inclusion of a counterweight, it is possible to prevent the compressor 10 from becoming too large in the axial direction.

[0103] Furthermore, in this embodiment, the rotor 60 includes an imbalance correction unit 80, which comprises a first balancing weight 62, a second balancing weight 64, and a negative balance unit 78. The imbalance correction unit 80 has an imbalance correction amount that corrects the imbalance caused by the movable scroll 38. Therefore, the imbalance of the rotating body including the rotor 60 and the movable scroll 38 can be corrected, and thus, noise and other noise generated accompanying the rotation of the rotating body can be suppressed.

[0104] Furthermore, in this embodiment, the connection between the axial extension 84 and the fixing part 82 (i.e., the end portion 82A on the outer periphery of the fixing part 82) is located further inward than the outer shape of the rotor core 30. Therefore, interference between the fixing part 82 and the stator core 24 disposed radially outward of the rotor core 30 can be suppressed. Additionally, the end portion 86A on the outer periphery of the radial extension 86 is located further inward than the outer shape of the stator core 24. Therefore, interference between the radial extension 86 and the motor housing 16 disposed radially outward of the stator core 24 can be suppressed.

[0105] Figure 9 This is a diagram comparing the shaft lengths of two different rotor types 60. Figure 9 In the rotor 60 shown on the left, the first balancing weight 62 and the second balancing weight 64 are respectively formed into blocks. In addition, the first balancing weight 62 and the second balancing weight 64 are respectively fixed to the rotor core 30 by rivets 104. Figure 9 The rotor 60 shown on the right is Figures 1 to 8 The rotor shown. According to... Figure 9 The rotor 60 shown on the right is... Figure 9 Compared to the rotor 60 shown on the left, the shaft length L can be shortened.

[0106] Next, variations of this embodiment will be described.

[0107] Figure 10 This is a longitudinal sectional view showing a first modified example of the combination of the first balancing weight 62 and the second balancing weight 64. Figure 10 In the first variation shown, the first balancing weight 62 is formed in a block shape. The first balancing weight 62 may have the same shape as the second balancing weight 64, or it may have a different shape.

[0108] Figure 11 This is a longitudinal sectional view showing a second modified example of the combination of the first balancing weight 62 and the second balancing weight 64. Figure 11 In the second variant shown, the radial extension 86 is omitted from the first counterweight 62, which has a fixed portion 82 and an axial extension 84.

[0109] Figure 12This is a longitudinal sectional view showing a third modified example of the combination of the first balancing weight 62 and the second balancing weight 64. Figure 12 In the third variation shown, the second counterweight 64 has a fixing portion 112 and an axial extension portion 114. The fixing portion 112 is an example of the "second fixing portion" in this disclosure, and the axial extension portion 114 is an example of the "second axial extension portion" in this disclosure. The fixing portion 112 is fixed to the end face of the rotor core 30 on the other axial side via the second cover plate 68. The axial extension portion 114 extends from the end of the outer peripheral side of the fixing portion 112 toward the other axial side of the rotor core 30.

[0110] Figure 13 This is a longitudinal sectional view showing a fourth modified example of the combination of the first balancing weight 62 and the second balancing weight 64. Figure 13 In the fourth variation shown, the first counterweight 62 has a fixing part 82 and an axial extension part 84, and the second counterweight 64 also has a fixing part 112 and an axial extension part 114, just like the first counterweight 62.

[0111] Figure 14 This is a longitudinal sectional view showing a fifth modified example of the combination of the first balancing weight 62 and the second balancing weight 64. Figure 14 In the fifth variation shown, the second counterweight 64 has a radial extension 116. The radial extension 116 is an example of a "second radial extension" in this disclosure. The radial extension 116 extends radially outward from the end of the axial extension 84 at its front end. The radial extension 116 is disposed in a space 106 between the stator 18 and the bottom of the motor housing 16. The space 106 is a dead zone space formed axially between the stator 18 and the compressor housing 34 of the motor unit 12.

[0112] With this configuration, for example, by adjusting the radial length of the fixing part 112 along the rotor core 30, the axial length of the axial extension 114 along the axial direction of the rotor core 30, and the radial length of the radial extension 116 along the radial direction of the rotor core 30, the imbalance of the rotating body can be corrected. Thus, the imbalance of the rotating body can be easily corrected.

[0113] Figure 15 This is a longitudinal sectional view showing a first modified example of the shape of the first balancing weight 62. Figure 15 In the first modified example shown, instead of the shaft insertion hole 88, the cutout 120 for inserting the shaft 22 is formed as a semi-circle. The first counterweight 62 can also be fixed to the rotor core 30 by inserting a rivet (not shown) into the positioning hole 92 and pressing the rivet into the rivet hole formed in the rotor core 30.

[0114] Figure 16This is a longitudinal sectional view showing a second modified example of the shape of the first balancing weight 62. Figure 16 In the second modified example shown, the fixing part 82 is formed in a circular shape. Furthermore, the axial extension 84 and the radial extension 86 are each formed as arcs along the circumference of the rotor core 30. With this configuration, for example, compared to the case where the axial extension 84 and the radial extension 86 are formed in a rectangular shape, the size of the axial extension 84 and the radial extension 86 can be increased. This allows for an increase in the amount of imbalance correction of the first balancing weight 62. Additionally, in order to form the radial extension 86 using a slitting blade, a cut can be formed at an appropriate location in the radial extension 86.

[0115] Figure 17 This is a longitudinal sectional view showing a third modified example of the shape of the first balancing weight 62. Figure 17 In the third variation shown, relative to Figure 16 In the second modified example shown, the fixing part 82 is formed in a semi-circular shape. In addition, in the fixing part 82, instead of the shaft insertion hole 88, the cutout 120 for inserting the shaft 22 is formed in a semi-circular shape.

[0116] Figure 18 This is a longitudinal sectional view showing a fourth variation of the shape of the first balancing weight 62. Figure 18 In the fourth variation shown, the radial extension 86 is omitted from the first counterweight 62, which has a fixed portion 82 and an axial extension 84.

[0117] Figure 19 This is a longitudinal sectional view showing a fifth variation of the shape of the first balancing weight 62. Figure 19 In the fifth variation shown, relative to Figure 18 In the fourth modified example shown, in the fixing part 82, the cutout 120 for inserting the shaft 22 is formed into a semi-circle instead of the shaft insertion hole 88.

[0118] Figure 20 This is a longitudinal sectional view showing a sixth modified example of the shape of the first balancing weight 62. Figure 20 In the sixth variation shown, relative to Figure 16 In the second variation shown, the radial extension 86 is omitted from the first counterweight 62, which has a fixing portion 82 and an axial extension 84. Alternatively, in order to form the axial extension 84 using a cutting blade, a cut may be formed at an appropriate location in the axial extension 84.

[0119] Figure 21 This is a longitudinal sectional view showing a seventh modified example of the shape of the first balancing weight 62. Figure 21 In the seventh variation shown, relative to Figure 20In the sixth modified example shown, the fixing part 82 is formed into a semi-circular shape. In addition, in the fixing part 82, instead of the shaft insertion hole 88, the cutout 120 for inserting the shaft 22 is formed into a semi-circular shape.

[0120] Figure 22 This is a longitudinal sectional view showing a modified example of the structure of the negative balance section 78. Figure 22 In the modified example shown, the negative balance section 78 has a first negative balance section 122 with an end face opening on one axial side of the rotor core 30 and a second negative balance section 124 with an end face opening on the other axial side of the rotor core 30.

[0121] The first negative balancing section 122 and the second negative balancing section 124 end at the same position in the axial direction of the rotor core 30. The depth Y of the second negative balancing section 124 is set to the value obtained by subtracting the depth X of the first negative balancing section 122 from the axial length Z of the rotor core 30. Alternatively, the first negative balancing section 122 and the second negative balancing section 124 may end at different positions in the axial direction of the rotor core 30. Furthermore, the first negative balancing section 122 and the second negative balancing section 124 may also extend through the rotor core 30 in the axial direction.

[0122] With this configuration, the imbalance of the rotating body can be corrected by both the first negative balance section 122 and the second negative balance section 124. Thus, for example, compared to the case where the negative balance section 78 includes only either the first negative balance section 122 or the second negative balance section 124, the imbalance of the rotating body can be easily corrected.

[0123] Figure 23 This is a graph showing the relationship between the depth X of the first negative balance section 122 and the rotational imbalance correction amount. Figure 23 In the example shown, the rotational imbalance correction amounts for the first balancing weight 62 and the second balancing weight 64 are set to fixed values, and the depth X of the first negative balance portion 122 is determined. Curves G3 and G4 are graphs showing the relationship between the depth X of the first balancing weight 62 and the rotational imbalance correction amount of the negative balance portion 78. The rotor core 30 is a structure formed by stacking multiple core sheets. Curve G3 shows the case where the core sheets with the first negative balance portion 122 are not rotated and stacked, and curve G4 shows the case where the core sheets with the first negative balance portion 122 are rotated and stacked.

[0124] Furthermore, on the axial side of the rotor core 30, the difference between the rotational imbalance correction amount of the first balancing weight 62 and the second balancing weight 64 and the rotational imbalance correction amount of the negative balance part 78 is caused by the keyway 90.

[0125] As shown by curve G3, when the core sheets are not rotated and stacked, the depth X of the first negative balance section 122 is proportional to the rotational imbalance correction amount of the negative balance section 78. On the other hand, as shown by curve G4, when the core sheets are rotated and stacked, the rotational imbalance correction amount of the negative balance section 78 varies in a manner that minimizes as the depth X of the first negative balance section 122 increases. Thus, by rotating and stacking the core sheets, the rotational imbalance correction amount of the negative balance section 78 can be adjusted.

[0126] Figure 24 This is a graph showing the relationship between the depth X of the first negative balance section 122 and the torque imbalance correction amount. Figure 24 In the example shown, the torque imbalance correction amount of the first balancing weight 62 and the second balancing weight 64 is set to a fixed value, and the depth X of the first negative balance portion 122 is determined. Curves G5 and G6 are graphs showing the relationship between the depth X of the first balancing weight 62 and the torque imbalance correction amount of the negative balance portion 78. Curve G5 shows the case where the core sheet with the first negative balance portion 122 is not rotated and stacked, and curve G6 shows the case where the core sheet with the first negative balance portion 122 is rotated and stacked.

[0127] Furthermore, on the axial side of the rotor core 30, the difference between the torque imbalance correction amount of the first balancing weight 62 and the second balancing weight 64 and the torque imbalance correction amount of the negative balance part 78 is caused by the keyway 90.

[0128] As shown by curve G5, when the core sheets are not rotated and stacked, the depth X of the first negative balance section 122 is proportional to the torque imbalance correction amount of the negative balance section 78. On the other hand, as shown by curve G6, when the core sheets are rotated and stacked, the torque imbalance correction amount of the negative balance section 78 varies in a manner that it has a minimum value as the depth X of the first negative balance section 122 increases. In this way, the torque imbalance correction amount of the negative balance section 78 can be adjusted by rotating and stacking the core sheets.

[0129] Figure 25 This is a longitudinal sectional view showing a first modified example of the shape of the negative balance section 78. Figure 25 In the modified example shown, a portion 78A of the negative balance portion 78 is formed at a position corresponding to the center of the rotor magnet 32 ​​(in other words, the magnet receiving hole 76) in the transverse width direction. The transverse width direction of the rotor magnet 32 ​​is along the tangential direction of the rotor core 30. The portion 78A of the negative balance portion 78 is formed in a concave shape. The portion 78A of the negative balance portion 78 is formed at a position that avoids the magnetic circuit of the rotor magnet 32.

[0130] With this configuration, it is possible to prevent a portion 78A of the negative balance section 78 from forming in the magnetic circuit of the rotor magnet 32, and to position the portion 78A of the negative balance section 78 further radially outward from the rotor core 30. This increases the amount of imbalance correction provided by the negative balance section 78.

[0131] Alternatively, the negative balance section 78 can be entirely formed at a position corresponding to the center of the rotor magnet 32 ​​in the transverse width direction.

[0132] Figure 26 This is a longitudinal sectional view showing a second modified example of the shape of the negative balance section 78. Figure 26 In the modified example shown, a portion 78A of the negative balance portion 78 is formed at a position corresponding to the adjacent rotor magnet 32 ​​(in other words, the adjacent magnet receiving hole 76). The portion 78A of the negative balance portion 78 is concave. The portion 78A of the negative balance portion 78 is formed at a position that avoids the magnetic path of the rotor magnet 32. Imagine line H as the outermost diameter line of the position avoiding the magnetic path of the rotor magnet 32; the negative balance portion 78 is formed at a position radially inner to the rotor core 30, closer to the imaginary line H.

[0133] With this configuration, it is possible to prevent a portion 78A of the negative balance section 78 from forming in the magnetic circuit of the rotor magnet 32, and to position the portion 78A of the negative balance section 78 further radially outward from the rotor core 30. This increases the amount of imbalance correction provided by the negative balance section 78.

[0134] Alternatively, the negative balance section 78 can be formed entirely at positions corresponding to the adjacent rotor magnets 32.

[0135] Figure 27 This is a diagram showing a first modified example of the fixing part 82 of the first balancing weight 62. Figure 27 In the first modified example shown, the fixing part 82, positioned to close the magnet receiving hole 76, has a magnet cooling hole 126A. The magnet cooling hole 126A is formed adjacent to the rotor magnet 32 ​​when viewed axially from the rotor core 30, and extends through the fixing part 82 in the thickness direction. As an example, the magnet cooling hole 126A is formed adjacent to the end of the rotor magnet 32 ​​in the transverse width direction. Furthermore, although not shown in the figure, it is also possible to have a first cover plate 66 (see reference 1) positioned between the fixing part 82 and the rotor core 30. Figure 1 A magnet cooling hole communicating with the magnet cooling hole 126A is formed in the rotor magnet 32. If configured in this way, the rotor magnet 32 ​​can be cooled by fluid flowing into the magnet cooling hole 126A.

[0136] Figure 28 This is a longitudinal sectional view showing a second modified example of the fixing part 82 of the first balancing counterweight 62. Figure 28In the second variation shown, the fixing part 82, located at the position that closes 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 adjacent to the rotor magnet 32 ​​when viewed axially from the rotor core 30, and extends through the fixing part 82 in the plate thickness direction. As an example, the magnet cooling hole 126B is formed adjacent to the center portion of the rotor magnet 32 ​​in the transverse width direction. Furthermore, although not shown in the figure, it is also possible to include a first cover plate 66 (see reference 1) disposed between the fixing part 82 and the rotor core 30. Figure 1 A magnet cooling hole communicating with the magnet cooling hole 126B is formed in the rotor magnet 32. If configured in this way, the rotor magnet 32 ​​can be cooled by fluid flowing into the magnet cooling hole 126B.

[0137] Figure 29 This is an exploded perspective view showing a first modified example of the structure of rotor 60. Figure 29 In the first modified example shown, the second counterweight 64 is disposed on the same side as the axial extension 84 and radial extension 86 of the first counterweight 62, and the negative counterweight 78 is formed on the opposite side to the axial extension 84 and radial extension 86 of the first counterweight 62.

[0138] Figure 29 The example shown is an example in which the positions of the first balancing weight 62, the second balancing weight 64, and the negative balancing part 78 in the circumferential direction of the rotor core 30 are set in such a way that the imbalance correction amount of the first balancing weight 62, the imbalance correction amount of the second balancing weight 64, and the imbalance correction amount of the negative balancing part 78 are balanced with the imbalance of the movable scroll 38.

[0139] Figure 30 This is a perspective view showing a second modified example of the structure of rotor 60. Figure 30 In the second variation shown, the first balancing weight 62 is formed as a block. The first balancing weight 62 can have the same shape as the second balancing weight 64, or it can have a different shape. As an example, the first balancing weight 62 is positioned on the side opposite to the second balancing weight 64. Figure 30 In the example shown, the negative balance part 78 can be configured on the same side as the first balance weight 62, or on the same side as the second balance weight 64.

[0140] In addition, in the above embodiment, the rotor 60 has a first balancing weight 62, a second balancing weight 64 and a negative balancing part 78, but any one or two of the first balancing weight 62, the second balancing weight 64 and the negative balancing part 78 may be omitted.

[0141] In addition, in the above embodiment, the rotor 60 having the first balancing weight 62, the second balancing weight 64 and the negative balancing part 78 is applicable to the compressor 10, but it can also be applied to other compressors.

[0142] In addition, the variations that can be combined among the above-mentioned variations can also be appropriately combined and implemented.

[0143] The above describes the embodiment, but this disclosure is not limited to the above. In addition to the above, various modifications can be made without departing from its spirit.

[0144] The following are notes related to this embodiment. (Postscript 1) A rotor comprising: Rotor core; A first balancing weight is disposed on one end face of the rotor core on one axial side; and The second balancing weight is disposed on the end face of the rotor core on the other side of the axial direction. (Postscript 2) As described in Appendix 1, the rotor, in which, The aforementioned first balancing weight has the following characteristics: The first fixing part is fixed to the end face of the rotor core on one axial side; and The first axial extension extends from the end of the outer periphery of the first fixing part toward the axial side of the rotor core. (Note 3) The rotor as described in Appendix 2, wherein the first balancing weight has a first radial extension extending radially outward from the end of the front end of the first axial extension toward the rotor core. (Postscript 4) As described in Appendix 3, the length of the first radial extension along the radial direction of the rotor core is longer than the length of the first axial extension along the axial direction of the rotor core. (Note 5) The rotor described in any of Appendix 2 to 4, wherein the thickness of the first fixing part along the axial direction of the rotor core is thinner than the thickness of the second balancing weight along the axial direction of the rotor core. (Note 6) The rotor described in any of notes 2 to 5, wherein, The first fixing part and the first axial extension part are formed in the shape of plates. (Note 7) The rotor described in any of Notes 3, 4, and Notes 5 or 6 which are subordinate to Note 3, wherein, The first fixing part, the first axial extension part, and the first radial extension part are formed into a plate shape. (Postscript 8) The rotor described in any of notes 2 to 7, wherein, The aforementioned first axial extension is formed in the shape of an arc along the circumference of the aforementioned rotor core. (Note 9) The rotor described in Appendix 3, Appendix 4, and any of Appendix 5 through Appendix 7 which are subordinate to Appendix 3, wherein, The first axial extension and the first radial extension are respectively formed as arcs along the circumference of the rotor core. (Postscript 10) The rotor described in any of notes 1 to 9, wherein, The rotor core has a shaft insertion hole formed at the center of the rotor core for shaft insertion. The aforementioned first counterweight has a positioning part that is positioned relative to the aforementioned axis. (Postscript 11) The rotor described in any of Notes 1 to 10, wherein, The rotor core has a hollow negative balance portion formed at a position that is radially outward from the center of the rotor core. (Postscript 12) The rotor described in Appendix 11, wherein, The rotor described above has a rotor magnet located radially outward from the rotor core, which is further away from the negative balance section described above. The aforementioned negative balance section is formed at a position that avoids the magnetic circuit of the aforementioned rotor magnet. (Postscript 13) The rotor as described in Appendix 11 or Appendix 12, wherein, The rotor described above has a rotor magnet located radially outward from the rotor core, which is further away from the negative balance section described above. At least a portion of the aforementioned negative balance section is formed at a position corresponding to the central portion in the transverse width direction of the aforementioned rotor magnet. (Postscript 14) The rotor described in any of Notes 11 to 13, wherein, The rotor described above has a plurality of rotor magnets disposed at a position radially outward of the rotor core, which is further outward than the negative balance section described above. The aforementioned plurality of rotor magnets are arranged circumferentially along the rotor. At least a portion of the aforementioned negative balance section is formed at a position corresponding to the adjacent aforementioned rotor magnet. (Postscript 15) The rotor described in any of Notes 11 to 14, wherein, The aforementioned negative balance section has: The first negative balance section has an opening on one axial side end face of the rotor core; and The second negative balance section has an opening on the end face of the rotor core on the other side of the axial direction. (Postscript 16) The rotor described in any of the appendices 3 through 15 belonging to appendix 2, wherein, The rotor core has an end face opening on one axial side of the rotor core and a magnet receiving hole for receiving rotor magnets. The aforementioned magnet receiving hole is closed by the aforementioned first fixing part. The first fixing part has a magnet cooling hole formed at a position adjacent to the rotor magnet when viewed from the axial direction of the rotor core. (Postscript 17) The rotor described in any of Notes 1 to 16, wherein, The aforementioned second balancing weight has the following characteristics: The second fixing part is fixed to the end face on the other side of the axial direction of the rotor core; The second axial extension extends from the end of the second fixing part on the outer peripheral side to the other axial side of the rotor core; and The second radial extension extends radially outward from the end of the front end side of the second axial extension toward the rotor core. (Postscript 18) A compressor, the compressor comprising: Electric motor section; The compressor unit is located on one axial side of the electric motor unit. The aforementioned electric motor unit includes: Motor housing; The stator is fixed to the inside of the motor housing; The rotor, which is rotatably disposed inside the stator; and The shaft is located at the center of the rotor. The aforementioned compressor unit includes: The compressor housing is assembled relative to the electric motor housing. A fixed scroll, wherein the fixed scroll is fixed to the inner side of the compressor housing; and A movable scroll plate is fixed eccentrically relative to the shaft and is configured to rotate relative to the fixed scroll plate. The rotor mentioned above includes: Rotor core; and A counterweight is provided on one end face of the rotor core along its axial direction. The above-mentioned counterweight has the following characteristics: The first fixing part is fixed to the end face of the rotor core on one side of the axial direction; An axial extension portion extends from the end of the outer periphery of the first fixing portion toward one axial side of the rotor core; and The radial extension extends radially outward from the end of the axial extension at its front end towards the rotor core. The aforementioned radial extension is disposed in the space between the stator and the compressor housing in the axial direction of the aforementioned motor unit. (Postscript 19) As described in Appendix 18, the compressor, among which, The rotor described above includes an imbalance correction unit comprising the aforementioned balancing weight. The aforementioned imbalance correction unit has an imbalance correction amount that corrects the imbalance caused by the aforementioned movable vortex. (Postscript 20) The compressor described in Appendix 18 or Appendix 19, wherein, The stator described above has a stator core portion disposed radially outside the rotor core portion. The connection between the aforementioned axial extension and the aforementioned first fixing part is located further inward than the outer shape of the aforementioned rotor core. The outer peripheral end of the aforementioned radial extension is located further inward than the outer shape of the aforementioned stator core.

Claims

1. A rotor, said rotor (60) comprising: Rotor core (30); A first balancing weight (62) is disposed on the end face of the rotor core on one side of the axial direction. as well as The second balancing weight (64) is disposed on the end face of the rotor core on the other side of the axial direction.

2. The rotor as claimed in claim 1, characterized in that, The first balancing weight has: A first fixing part (82) is fixed to the end face of the rotor core on one axial side; and The first axial extension (84) extends from the end of the outer peripheral side of the first fixing part toward the axial side of the rotor core.

3. The rotor as described in claim 2, characterized in that, The first counterweight has a first radial extension (86) extending radially outward from the end of the first axial extension toward the rotor core.

4. The rotor as described in claim 3, characterized in that, The radial length of the first radial extension along the rotor core is longer than the axial length of the first axial extension along the rotor core.

5. The rotor as described in any one of claims 2 to 4, characterized in that, The thickness of the first fixing part along the axial direction of the rotor core is thinner than the thickness of the second balancing weight along the axial direction of the rotor core.

6. The rotor as claimed in any one of claims 2 to 5, characterized in that, The first fixing part and the first axial extension part are formed in the shape of plates.

7. The rotor as claimed in claims 3, 4 and any one of claims 5 or 6 dependent on claim 3, characterized in that, The first fixing portion, the first axial extension portion, and the first radial extension portion are formed in the shape of a plate.

8. The rotor as claimed in any one of claims 2 to 7, characterized in that, The first axial extension is formed as an arc along the circumference of the rotor core.

9. The rotor as claimed in claims 3, 4 and any one of claims 5 to 7 dependent on claim 3, characterized in that, The first axial extension and the first radial extension are respectively formed as arcs along the circumference of the rotor core.

10. The rotor as claimed in any one of claims 1 to 9, characterized in that, The rotor core has a shaft insertion hole (74) formed in the center of the rotor core for shaft insertion. The first counterweight has a positioning part (90, 92) positioned relative to the axis.

11. The rotor as claimed in any one of claims 1 to 10, characterized in that, The rotor core has a hollow negative balance portion (78) formed at a position that is radially outward from the center of the rotor core.

12. The rotor as claimed in claim 11, characterized in that, The rotor has a rotor magnet (32) located radially outward from the rotor core, which is further from the negative balance section. The negative balance section is formed at a position that avoids the magnetic circuit of the rotor magnet.

13. The rotor as claimed in claim 11 or 12, characterized in that, The rotor has a rotor magnet located radially outward from the rotor core, further than the negative balance section. At least a portion of the negative balance section is formed at a position corresponding to the central portion in the transverse width direction of the rotor magnet.

14. The rotor as claimed in any one of claims 11 to 13, characterized in that, The rotor has a plurality of rotor magnets disposed radially outward from the rotor core, which is further outward than the negative balance section. The plurality of rotor magnets are arranged circumferentially along the rotor. At least a portion of the negative balance section is formed at a position corresponding to the adjacent rotor magnet.

15. The rotor as claimed in any one of claims 11 to 14, characterized in that, The negative balance section has: The first negative balance part (122) has an opening on the end face of the rotor core on one axial side. as well as The second negative balance part (124) has an opening on the end face of the rotor core on the other side of the axial direction.

16. The rotor as described in any one of claims 3 to 15, which is dependent on claim 2, is characterized in that, The rotor core has an end face opening on one axial side of the rotor core and a magnet receiving hole for receiving rotor magnets. The magnet receiving hole is closed by the first fixing part. The first fixing part has magnet cooling holes (126A, 126B) formed at a position adjacent to the rotor magnet when viewed from the axial direction of the rotor core.

17. The rotor as claimed in any one of claims 1 to 16, characterized in that, The second counterweight has: The second fixing part (112) is fixed to the end face on the other side of the axial direction of the rotor core; The second axial extension (114) extends from the end of the outer peripheral side of the second fixing part to the other axial side of the rotor core. as well as The second radial extension (116) extends radially outward from the end of the front end side of the second axial extension toward the rotor core.

18. A compressor, the compressor comprising: Electric motor section (12); as well as The compressor unit (14) is located on one axial side of the motor unit. The electric motor unit includes: Motor housing (16); Stator (18), the stator being fixed to the inside of the motor housing; Rotor (60), the rotor being rotatably disposed inside the stator; and Shaft (22), the shaft being disposed at the center of the rotor, The compressor unit includes: Compressor housing (34), the compressor housing being assembled relative to the motor housing; A fixed scroll (36) is fixed to the inner side of the compressor housing; and A movable scroll plate (38) is fixed eccentrically relative to the shaft and is configured to rotate relative to the fixed scroll plate. The rotor includes: Rotor core (30); and A counterweight (62) is disposed on the end face of one axial side of the rotor core. The balancing weight has the following characteristics: A fixing part (82) is fixed to the end face of the rotor core on one axial side; An axial extension (84) extends from the end of the fixed portion on the outer peripheral side toward one axial side of the rotor core; and A radial extension (86) extends radially outward from the end of the axial extension toward the rotor core. The radial extension is disposed in the space (100) between the stator and the compressor housing in the axial direction of the motor unit.

19. The compressor as claimed in claim 18, characterized in that, The rotor includes an imbalance correction section (80) containing the balancing weight. The imbalance correction unit has an imbalance correction amount that corrects the imbalance caused by the movable scroll.

20. The compressor as claimed in claim 18 or 19, characterized in that, The stator has a stator core (24) disposed radially outside the rotor core. The connection between the axial extension and the fixing part is located further inward than the outer shape of the rotor core. The outer peripheral end of the radial extension is located further inward than the outer shape of the stator core.

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