Rotor and compressor

Abstract

To provide a rotor and a compressor capable of suppressing unbalance of a body of rotation at a low cost compared to a case when a balance weight is added.SOLUTION: A rotor (10) has a rotor core (30) and a plurality of magnets (32) arranged in a circumferential direction of the rotor core and embedded in the rotor core. The plurality of magnets include a first magnet (32A) and a second magnet (32B) whose at least any of thickness, width, angle pitch is different from that of the first magnet.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a rotor and a compressor. [Background technology]

[0002] Conventionally, there is an embedded magnet rotor that includes a rotor core and a plurality of magnets embedded in the rotor core and arranged in the circumferential direction of the rotor core. This rotor is sometimes used, for example, as a rotor for a compressor that includes a motor section and a compressor section (see, for example, Patent Document 1).

[0003] In the compressor, the motor section includes a motor housing, a stator fixed inside the motor housing, a rotor rotatably provided inside the stator, and a shaft provided at the center of the rotor. The compressor section includes a compressor housing assembled to the motor housing, a fixed scroll fixed inside the compressor housing, and a movable scroll fixed eccentrically to the shaft and rotatable relative to the fixed scroll. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-105933 Summary of the Invention [Problem to be solved by the invention]

[0005] In the compressor described above, the movable scroll is fixed eccentrically to the shaft. Therefore, imbalance occurs in the rotating body including the movable scroll, rotor, and shaft. One method for suppressing imbalance in the rotating body is to attach a balance weight to the shaft or rotor to correct the imbalance. However, this method increases costs by adding a balance weight, which is a separate component from the rotor.

[0006] The technique disclosed herein provides a rotor and a compressor that can suppress unbalance of a rotating body at a lower cost than when adding a balance weight. [Means for solving the problem]

[0007] A first aspect of the technology of the present disclosure is a rotor (20) comprising a rotor core (30) and a plurality of magnets (32) arranged circumferentially around the rotor core and embedded in the rotor core, the plurality of magnets including a first magnet (32A) and a second magnet (32B) that differs from the first magnet in at least one of thickness, width, and angular pitch.

[0008] A second aspect of the disclosed technique is a compressor including a motor section (12) and a compressor section (14) provided on one axial side of the motor section, the motor section including a motor housing (16), a stator (18) fixed inside the motor housing, a rotor (20) rotatably provided inside the stator, and a shaft (22) provided at the center of the rotor, and the compressor section including a compressor housing (34) assembled to the motor housing, a fixed scroll (36) fixed inside the compressor housing, and a fixed scroll (36) eccentric with respect to the shaft. and an orbiting scroll (38) fixed in a fixed state and rotatable relative to the fixed scroll, wherein the rotor, the shaft, and the orbiting scroll form a rotating body (56), the rotor comprises a rotor core and a plurality of magnets embedded in the rotor core and aligned in the circumferential direction of the rotor core, the plurality of magnets including a first magnet and a second magnet different from the first magnet in at least one of thickness, width, and angular pitch, thereby correcting imbalance of the rotating body caused by the orbiting scroll.

[0009] According to the technology of the present disclosure, a rotor and a compressor are provided that can suppress unbalance of a rotating body at a lower cost than when adding a balance weight. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a vertical cross-sectional view showing an example of a compressor. [Figure 2] FIG. 2 is a plan view of the rotor according to the first embodiment. [Figure 3] FIG. 10 is a plan view of a rotor according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] [First embodiment] First, a first embodiment of the present disclosure will be described.

[0012] The compressor shown in Fig. 1 is a scroll compressor. The compressor 10 includes a motor section 12 and a compressor section 14 provided on one axial side of the motor section 12.

[0013] The motor section 12 comprises a motor housing 16, a stator 18 fixed to the inside of the motor housing 16, a rotor 20 rotatably arranged radially inside the stator 18, and a shaft 22 arranged in the center of the rotor 20.

[0014] The stator 18 includes a stator core 24, an insulator 26 attached to the stator core 24, and a winding 28 wound around the stator core 24 via the insulator 26. The rotor 20 includes a rotor core 30 and a plurality of magnets 32 embedded in the rotor core 30 and aligned in the circumferential direction of the rotor core 30.

[0015] The compressor section 14 includes a compressor housing 34, a fixed scroll 36 fixed inside the compressor housing 34, and a movable scroll 38 provided so as to be able to turn relative to the fixed scroll 36. The compressor housing 34 includes a first housing 40 assembled to the motor housing 16, and a second housing 42 provided on one axial side of the first housing 40.

[0016] An intake port 44 is formed in the motor housing 16, and an exhaust port 46 is formed in the second housing 42. The space between the fixed scroll 36 and the movable scroll 38 is formed as a compression chamber, and the intake port 44 is connected to the compression chamber through the space inside the motor housing 16, etc., and the compression chamber is connected to the exhaust port 46 through a flow path formed in the second housing 42, etc.

[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 axial end of the shaft 22, and a third bearing 54 is provided in the movable scroll 38. The eccentric shaft 52 is rotatably supported by the third bearing 54, so that the movable scroll 38 is fixed in an eccentric state with respect to the shaft 22.

[0018] In the compressor 10 configured as described above, when a rotating magnetic field is generated by the stator 18, the shaft 22 rotates integrally with the rotor 20. Furthermore, the orbiting scroll 38 orbits in response to the rotation of the shaft 22, changing the volume of the compression chamber, and the fluid drawn into the compression chamber through the suction port 44 is compressed in the compression chamber. The compressed fluid is then discharged from the discharge port 46.

[0019] The rotor 20, the shaft 22, and the movable scroll constitute a rotating body 56. In the rotating body 56, the movable scroll 38 is fixed in an eccentric state relative to the shaft 22. Therefore, an imbalance occurs in the rotating body 56. In order to suppress the imbalance of the rotating body 56, in the first embodiment, the rotor 20 is configured as follows.

[0020] 2, rotor 20 is an interior permanent magnet (IPM) type rotor. Rotor core 30 is a laminated body formed by stacking a plurality of core sheets in the axial direction of rotor core 30. An outer peripheral surface 30A of rotor core 30 is formed in a circular shape when viewed from the axial direction of rotor core 30.

[0021] The rotor core 30 has an insertion hole 58 and a plurality of accommodating holes 60. The insertion hole 58 and the plurality of accommodating holes 60 penetrate the rotor core 30 in the axial direction. The shaft 22 (see FIG. 1) is inserted into the insertion hole 58. The insertion hole 58 is formed in the center of the rotor core 30.

[0022] The multiple accommodating holes 60 are aligned in the circumferential direction of the rotor core 30 along the outer peripheral surface 30A of the rotor core 30. Each accommodating hole 60 is located closer to the outer peripheral surface 30A than the center of the rotor core 30. As will be described later, if the magnets 32 accommodated in the accommodating holes 60 are positioned closer to the stator 18 (see FIG. 1) that is positioned radially outward of the rotor 20, the performance of the motor unit 12, which is a brushless motor, is improved. Therefore, the accommodating holes 60 are formed at positions closer to the outer peripheral surface 30A of the rotor core 30.

[0023] Each magnet 32 ​​is accommodated in an accommodation hole 60. The magnets 32 are formed in a flat plate shape and extend with the tangential direction of the rotor core 30 as the width direction. Half of the magnets 32 on the outer peripheral surface 30A side are formed by one of the N and S poles (e.g., N pole), and half of the magnets 32 opposite the outer peripheral surface 30A are formed by the other of the N and S poles (e.g., S pole). The magnetic pole (e.g., N pole) of the half of the magnets 32 on the outer peripheral surface 30A side of one of the adjacent magnets 32 is set to a different magnetic pole from the magnetic pole (e.g., S pole) of the half of the magnets 32 on the outer peripheral surface 30A side of the other of the adjacent magnets 32.

[0024] The multiple magnets 32 include a first magnet 32A and a second magnet 32B having a thickness different from that of the first magnet 32A. The thickness of the magnet 32 ​​refers to the dimension of the magnet 32 ​​along the radial direction of the rotor core 30. As an example, the second magnet 32B is thinner than the first magnet 32A. The accommodating hole 60 (hereinafter referred to as the "first accommodating hole 60A") that accommodates the first magnet 32A has a width corresponding to the thickness of the first magnet 32A, and the accommodating hole 60 (hereinafter referred to as the "second accommodating hole 60B") that accommodates the second magnet 32B has a width corresponding to the thickness of the second magnet 32B. In other words, the second accommodating hole 60B has a width different from that of the first accommodating hole 60A. The width of the accommodating hole 60 refers to the dimension of the accommodating hole 60 along the radial direction of the rotor core 30.

[0025] The first magnet 32A and the second magnet 32B have the same width. The width of the magnet 32 ​​refers to the dimension of the magnet 32 ​​along the tangential direction of the rotor core 30. Similarly, the first accommodating hole 60A and the second accommodating hole 60B have the same length. The length of the accommodating hole 60 refers to the dimension of the accommodating hole 60 along the tangential direction of the rotor core 30.

[0026] The magnets 32 are arranged at equal angular pitches. The angular pitch refers to the smaller of the angles formed by a line connecting the center of gravity of one of the magnets 32 adjacent to each other in the circumferential direction of the rotor core 30 to the center of rotation C of the rotor core 30 and a line connecting the center of gravity of the other of the magnets 32 adjacent to each other in the circumferential direction of the rotor core 30 to the center of rotation C of the rotor core 30.

[0027] When viewed from the axial direction of rotor core 30, if the axial end face of rotor core 30 is divided into a first region A1 and a second region A2 by an imaginary line L that passes through the center of rotation C of rotor core 30 and extends in a direction (radial direction) perpendicular to the axial direction of rotor core 30, first magnet 32A is arranged in first region A1, and second magnet 32B is arranged in second region A2. As an example, the number of magnets 32 is eight, and the number of first magnets 32A and the number of second magnets 32B are four each. In other words, the number of first magnets 32A and the number of second magnets 32B are the same.

[0028] In the first embodiment, the multiple magnets 32 include a first magnet 32A and a second magnet 32B that has a different thickness than the first magnet 32A, thereby correcting the imbalance of the rotating body 56 caused by the movable scroll 38. That is, in Fig. 2, the size of the arrows B1 and B2 indicates the weight balance of the rotor 20, and the imbalance of the rotor 20 corresponding to the difference in size between the arrows B1 and B2 cancels out the imbalance of the rotating body 56 caused by the movable scroll 38.

[0029] As described above in detail, in the rotor 20 according to the first embodiment, the plurality of magnets 32 include the first magnet 32A and the second magnet 32B, which has a thickness different from that of the first magnet 32A, thereby correcting the imbalance of the rotating body 56 caused by the movable scroll 38. Therefore, it is possible to suppress the imbalance of the rotating body 56 at a lower cost than when a balance weight, which is a separate part from the rotor 20, is added.

[0030] In the first embodiment, the imbalance of the rotating body 56 caused by the movable scroll 38 is corrected by making the thickness of the second magnet 32B different from the thickness of the first magnet 32A, but the imbalance of the rotating body 56 caused by the movable scroll 38 may be corrected by making the width of the second magnet 32B different from the width of the first magnet 32A. Even in this case, the imbalance of the rotating body 56 can be suppressed at a lower cost than when a balance weight that is a separate part from the rotor 20 is added.

[0031] Furthermore, the thickness of the second magnet 32B may be different from the thickness of the first magnet 32A, and the width of the second magnet 32B may be different from the width of the first magnet 32A, thereby correcting the imbalance of the rotating body 56 caused by the movable scroll 38. Even in this case, the imbalance of the rotating body 56 can be suppressed at a lower cost than when a balance weight that is a separate part from the rotor 20 is added.

[0032] [Second embodiment] Next, a second embodiment of the present disclosure will be described.

[0033] In the second embodiment shown in FIG. 3, the configuration of the rotor 20 is modified as follows compared to the first embodiment. In the second embodiment, the angular pitch of the second magnets 32B (hereinafter referred to as the "second angular pitch") is different from the angular pitch of the first magnets 32A (hereinafter referred to as the "first angular pitch"). The first angular pitch refers to the angular pitch between adjacent first magnets 32A, and the second angular pitch refers to the angular pitch between adjacent second magnets 32B. The first magnets 32A are arranged at the first angular pitch, and the second magnets 32B are arranged at a second pitch that is different from the first angular pitch.

[0034] The first angular pitch refers to the angle formed by a line connecting the center of gravity of one of the first magnets 32A adjacent to each other in the circumferential direction of the rotor core 30 to the center of rotation C of the rotor core 30, and a line connecting the center of gravity of the other of the first magnets 32A adjacent to each other in the circumferential direction of the rotor core 30 to the center of rotation C of the rotor core 30.

[0035] The second angular pitch refers to the angle formed by a line connecting the center of gravity of one of the second magnets 32B adjacent in the circumferential direction of the rotor core 30 to the center of rotation C of the rotor core 30, and a line connecting the center of gravity of the other of the second magnets 32B adjacent in the circumferential direction of the rotor core 30 to the center of rotation C of the rotor core 30. As an example, the second angular pitch is larger than the first angular pitch.

[0036] Furthermore, the width of the second magnet 32B is different from the width of the first magnet 32A. As an example, the second magnet 32B is wider than the first magnet 32A. The first magnet 32A and the second magnet 32B have the same thickness.

[0037] When viewed from the axial direction of the rotor core 30, if the axial end surface of the rotor core 30 is divided into a first region A1 and a second region A2 by a virtual line L that passes through the rotation center C of the rotor core 30 and extends in a direction (radial direction) perpendicular to the axial direction of the rotor core 30, the first magnets 32A are arranged in the first region A1, and the second magnets 32B are arranged in the second region A2. As an example, the number of magnets 32 is six. Furthermore, the number of first magnets 32A is four, and the number of second magnets 32B is two. In other words, the number of second magnets 32B is different from the number of first magnets 32A. Specifically, the number of second magnets 32B is half the number of first magnets 32A.

[0038] In the second embodiment, the plurality of magnets 32 includes a first magnet 32A and a second magnet 32B that has a width and an angular pitch different from those of the first magnet 32A, thereby correcting the imbalance of the rotating body 56 caused by the movable scroll 38. That is, in Fig. 3, the size of the arrows B1 and B2 indicates the weight balance of the rotor 20, and the imbalance of the rotor 20 corresponding to the difference in size between the arrows B1 and B2 cancels out the imbalance of the rotating body 56 caused by the movable scroll 38.

[0039] As described above in detail, in the rotor 20 according to the second embodiment, the plurality of magnets 32 include the first magnet 32A and the second magnet 32B, which has a width and an angular pitch different from those of the first magnet 32A, thereby correcting the imbalance of the rotating body 56 caused by the movable scroll 38. Therefore, it is possible to suppress the imbalance of the rotating body 56 at a lower cost than when a balance weight, which is a separate part from the rotor 20, is added.

[0040] In the second embodiment, the imbalance of the rotating body 56 caused by the movable scroll 38 is corrected by making the width of the second magnet 32B different from the width of the first magnet 32A and by making the angular pitch of the second magnet 32B different from the angular pitch of the first magnet 32A, but the imbalance of the rotating body 56 caused by the movable scroll 38 may be corrected by making the angular pitch of the second magnet 32B different from the angular pitch of the first magnet 32A. Even in this case, the imbalance of the rotating body 56 can be suppressed at a lower cost than when a balance weight that is a separate component from the rotor 20 is added.

[0041] Furthermore, the thickness of the second magnet 32B may be different from the thickness of the first magnet 32A, and the angular pitch of the second magnet 32B may be different from the angular pitch of the first magnet 32A, thereby correcting the imbalance of the rotating body 56 caused by the movable scroll 38. Even in this case, the imbalance of the rotating body 56 can be suppressed at a lower cost than when a balance weight that is a separate part from the rotor 20 is added.

[0042] The above describes one embodiment of the technology of the present disclosure, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modifications within the scope of the gist of the present disclosure.

[0043] Below, supplementary notes are provided regarding the technology of the present disclosure. (Appendix 1) A rotor core (30); a plurality of magnets (32) arranged in a circumferential direction of the rotor core and embedded in the rotor core; Equipped with The plurality of magnets include a first magnet (32A) and a second magnet (32B) that is different from the first magnet in at least one of thickness, width, and angular pitch. Rotor (20). (Appendix 2) The second magnet has a different thickness from the first magnet. 10. The rotor of claim 1. (Appendix 3) The second magnet has a different width than the first magnet. 10. The rotor of claim 1 or 2. (Appendix 4) The second magnet has a different angular pitch from the first magnet. 4. A rotor according to any one of claims 1 to 3. (Appendix 5) When viewed from the axial direction of the rotor core, if the axial end surface of the rotor core is divided into a first region (A1) and a second region (A2) by a virtual line (L) that passes through the center of rotation (C) of the rotor core and extends in a direction perpendicular to the axial direction of the rotor core, the first magnet is arranged in the first region and the second magnet is arranged in the second region (A2). 5. A rotor according to any one of claims 1 to 4. (Appendix 6) a motor unit (12); a compressor section (14) provided on one axial side of the motor section; Equipped with The motor unit includes: a motor housing (16); a stator (18) fixed inside the motor housing; a rotor (20) rotatably provided inside the stator; a shaft (22) provided at the center of the rotor; Equipped with The compressor unit includes: a compressor housing (34) assembled to the motor housing; a fixed scroll (36) fixed inside the compressor housing; a movable scroll (38) fixed eccentrically to the shaft and rotatable relative to the fixed scroll; Equipped with the rotor, the shaft, and the movable scroll constitute a rotating body (56); The rotor is A rotor core; a plurality of magnets arranged in a circumferential direction of the rotor core and embedded in the rotor core; Equipped with The plurality of magnets include a first magnet and a second magnet that is different from the first magnet in at least one of thickness, width, and angular pitch, thereby correcting imbalance of the rotating body caused by the movable scroll. Compressor (10). [Explanation of symbols]

[0044] 10...Compressor, 12...Motor section, 14...Compressor section, 16...Motor housing, 18...Stator, 20...Rotor, 22...Shaft, 24...Stator core, 26...Insulator, 28...Winding, 30...Rotor core, 30A...Outer surface, 32...Magnet, 32A...First magnet, 32B...Second magnet, 34...Compressor housing, 36...Fixed scroll, 38...Moving scroll, 40...First housing, 42...Second housing, 44...Suction port, 46...Discharge port, 48...First bearing, 50...Second bearing, 52...Eccentric shaft, 54...Third bearing, 56...Rotor, 58...Insertion hole, 60...Accommodating hole, 60A...First accommodating hole, 60B...Second accommodating hole

Claims

1. A rotor core (30); a plurality of magnets (32) arranged in a circumferential direction of the rotor core and embedded in the rotor core; Equipped with The plurality of magnets include a first magnet (32A) and a second magnet (32B) that is different from the first magnet in at least one of thickness, width, and angular pitch. Rotor (20).

2. The second magnet has a thickness different from that of the first magnet. The rotor of claim 1 .

3. The second magnet has a different width than the first magnet. The rotor of claim 1 .

4. The second magnet has a different angular pitch from the first magnet. The rotor of claim 1 .

5. When viewed from the axial direction of the rotor core, if an end surface of the rotor core in the axial direction is divided into a first region (A1) and a second region (A2) by a virtual line (L) that passes through a rotation center (C) of the rotor core and extends in a direction perpendicular to the axial direction of the rotor core, the first magnet is arranged in the first region and the second magnet is arranged in the second region (A2). The rotor of claim 1 .

6. A motor unit (12); a compressor section (14) provided on one axial side of the motor section; Equipped with The motor unit includes: a motor housing (16); a stator (18) fixed inside the motor housing; a rotor (20) rotatably provided inside the stator; a shaft (22) provided at the center of the rotor; Equipped with The compressor unit includes: a compressor housing (34) assembled to the motor housing; a fixed scroll (36) fixed inside the compressor housing; a movable scroll (38) fixed in an eccentric state relative to the shaft and rotatable relative to the fixed scroll; Equipped with The rotor, the shaft, and the movable scroll constitute a rotating body (56), The rotor is A rotor core; a plurality of magnets arranged in a circumferential direction of the rotor core and embedded in the rotor core; Equipped with The plurality of magnets include a first magnet and a second magnet that is different from the first magnet in at least one of thickness, width, and angular pitch, thereby correcting imbalance of the rotating body caused by the movable scroll. Compressor (10).

Images