Outer rotor and compressor with same

Abstract

An outer rotor of a compressor includes: a core formed in a hollow cylindrical shape; a plurality of permanent magnets disposed on an inner circumferential surface of the core; a cap disposed to cover one end of the core and including a bushing hole formed at a center thereof; and the bushing is arranged in the bushing hole of the top cover. The core and the bushing are made of a metal material, and the cap is made of a resin material. The top cover includes at least one inner notch formed on an inner circumferential surface of the bushing hole and at least one outer notch formed on an outer circumferential surface of the top cover.

Description

Technical Field

[0001] This disclosure relates to a compressor, and more specifically, to a compressor having an external rotor. Background Technology

[0002] A compressor is a mechanical device that compresses incoming gas, increases its pressure, and discharges the compressed gas. Based on their working principle, compressors can be classified into reciprocating compressors and rotary compressors.

[0003] Rotary compressors can include rotary compressors and scroll compressors.

[0004] Reciprocating compressors may include those that use a crankshaft and connecting rod to convert the rotary motion of an electric motor into the linear reciprocating motion of a piston in order to draw in, compress, and discharge gases.

[0005] Typically, reciprocating compressors use an internal rotor motor to generate rotational force.

[0006] However, since internal rotor motors have a rotor located inside the stator, the moment of inertia of the rotor may be limited by the size of the stator.

[0007] To increase the rotational inertia of the rotor, an external rotor motor can be used in a reciprocating compressor. An external rotor motor may include a stator and an external rotor disposed outside the stator. Summary of the Invention

[0008] Technical solution

[0009] Various aspects of this disclosure are intended to at least address the aforementioned problems and / or disadvantages, and to at least provide the advantages described below. Therefore, aspects of this disclosure provide a compressor having an external rotor.

[0010] Additional aspects will be set forth in part in the description which follows, and will become apparent in part from the description itself, or may be learned by practice of the embodiments presented.

[0011] According to one aspect of this disclosure, an outer rotor for a compressor is provided. The outer rotor includes: a core forming a hollow cylindrical shape; a plurality of permanent magnets disposed on the inner peripheral surface of the core; a top cover configured to cover one end of the core and including a bushing hole formed at the center of the top cover; and a bushing disposed in the bushing hole of the top cover, wherein the core and the bushing are made of a metallic material, and the top cover is made of a resin material, and wherein the top cover includes at least one inner groove formed on the inner peripheral surface of the bushing hole and at least one outer groove formed on the outer peripheral surface of the top cover.

[0012] According to one or more embodiments of this disclosure, at least one outer slot may be formed as part of exposing the core and a plurality of permanent magnets.

[0013] According to one or more embodiments of this disclosure, at least one outer slot may be formed in a channel shape. The at least one outer slot may have a width of at least 1.0 mm.

[0014] According to one or more embodiments of this disclosure, at least one inner groove may be formed as part of an exposed bushing.

[0015] According to one or more embodiments of this disclosure, at least one inner groove may be formed in a channel shape. The at least one inner groove may have a width of at least 0.2 mm.

[0016] According to one or more embodiments of this disclosure, at least one inner groove may include three inner grooves.

[0017] According to one or more embodiments of this disclosure, at least one outer slot may include three outer slots.

[0018] According to another aspect of this disclosure, a core is provided. The core includes a plurality of magnet supports formed at regular intervals on an inner peripheral surface, wherein each of the plurality of magnet supports includes a through hole formed along the longitudinal direction of the core, and wherein the top cover further includes: a plurality of extensions extending from a surface of the top cover that contacts the core and passing through the through holes of the plurality of magnet supports; and a support ring having an annular shape and disposed at the lower ends of the plurality of extensions to cover the other ends of the core and the other ends of the plurality of permanent magnets.

[0019] According to one or more embodiments of this disclosure, the core and bushing may be made of steel. The top cover may be made of polybutylene terephthalate (PBT).

[0020] According to one or more embodiments of this disclosure, the top cover may include a plurality of assembly holes formed adjacent to the edge of the top cover.

[0021] According to another aspect of this disclosure, a compressor is provided. The compressor includes: a housing; an outer rotor rotatably disposed inside the housing; and a stator disposed inside the outer rotor, wherein the outer rotor includes: a core forming a hollow cylindrical shape; a plurality of permanent magnets disposed on the inner peripheral surface of the core; a top cover configured to cover one end of the core and including a bushing hole formed at the center of the top cover; and a bushing disposed in the bushing hole of the top cover, wherein the core and the bushing are made of a metallic material, and the top cover is made of a resin material, and wherein the top cover includes at least one inner groove formed on the inner peripheral surface of the bushing hole and at least one outer groove formed on the outer peripheral surface of the top cover. Attached Figure Description

[0022] These and / or other aspects, features, and advantages of some embodiments of the present disclosure will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 This is a perspective view showing a compressor according to one or more embodiments of the present disclosure.

[0024] Figure 2 This is a cross-sectional view of a compressor according to one or more embodiments of the present disclosure.

[0025] Figure 3 It shows Figure 2 A partially enlarged cross-sectional view of the compressor motor.

[0026] Figure 4 This is a perspective view showing an external rotor used in a compressor according to one or more embodiments of the present disclosure.

[0027] Figure 5 It shows Figure 4 A perspective view of the outer rotor after it has been flipped over.

[0028] Figure 6 It shows Figure 4 The cross-sectional view of the outer rotor taken along line AA.

[0029] Figure 7 It shows Figure 4 A cross-sectional view taken along line BB of the outer rotor.

[0030] Figure 8 It shows Figure 4 Exploded perspective view of the outer rotor.

[0031] Figure 9 yes Figure 4 Bottom view of the outer rotor.

[0032] Figure 10 This is a perspective view showing the core of an outer rotor according to one or more embodiments of the present disclosure.

[0033] Figure 11 This is a perspective view showing the top cover of an outer rotor according to one or more embodiments of the present disclosure.

[0034] Figure 12 This is a perspective view showing a bushing according to one or more embodiments of the present disclosure.

[0035] Figure 13 It is a perspective view showing an outer rotor without outer and inner slots.

[0036] Throughout the accompanying drawings, the same reference numerals are used to denote the same elements. Detailed Implementation

[0037] The following description, provided with reference to the accompanying drawings, is intended to aid in a comprehensive understanding of the various embodiments of this disclosure as defined by the claims and their equivalents. Various specific details are included in the following description to aid understanding, but these details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of this disclosure. Additionally, descriptions of known functions and structures may be omitted for clarity and brevity.

[0038] The terms and words used in the following description and claims are not limited to their literal meaning, but are intended solely by the inventors to achieve a clear and consistent understanding of this disclosure. Therefore, it will be clearly understood by those skilled in the art that the following description of various embodiments of this disclosure is for illustrative purposes only and not for limiting the purpose of this disclosure as defined by the appended claims and their equivalents.

[0039] It should be understood that, unless the context clearly indicates otherwise, the singular forms “a” and “the” include plural indicators. Thus, for example, a reference to “component surface” includes a reference to one or more such surfaces.

[0040] In this document, each phrase such as “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C”, “at least one of A, B or C” can include any one of the items listed with the corresponding phrase, or all possible combinations thereof.

[0041] The term “and / or” includes any one of the multiple related descriptive elements or a combination of multiple related descriptive elements.

[0042] Terms such as “first,” “second,” “primary,” and “secondary” can be used only to distinguish one component from others and do not limit the corresponding component in other ways (e.g., importance or order).

[0043] When referring to one (e.g., the first) component as “coupled” or “connected” to another (e.g., the second) component, whether or not the terms “functionally” or “communically” are used, it means that the first component can be connected to the second component directly (e.g., wired), wirelessly, or via a third component.

[0044] Terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, operations, components, parts or combinations thereof described in the embodiments of this disclosure, but do not exclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0045] When a component is referred to as being “connected,” “coupled,” “supported,” or “in contact” with another component, this indicates not only that the component is directly connected, coupled, supported, or in contact, but also that the component is indirectly connected, coupled, supported, or in contact through a third component.

[0046] When a component is referred to as being "on top of" another component, this includes not only the case where the component is in contact with the other component, but also the case where there is another component between the two components.

[0047] Furthermore, the terms “front end,” “rear end,” “upper side,” “lower side,” “top,” “bottom,” etc., used in this disclosure are defined with reference to the accompanying drawings. However, the shape and position of each component are not limited by these terms.

[0048] It should be understood that each box in a flowchart, as well as combinations of flowcharts, can be executed by one or more computer programs that include computer-executable instructions. One or more computer programs can be stored entirely in a single storage device, or one or more computer programs can be divided into multiple parts stored in multiple different storage devices.

[0049] Any function or operation described herein may be processed by a processor or a combination of processors. A processor or a combination of processors is a circuit that performs processing and includes circuits such as: application processor (AP, e.g., central processing unit (CPU)), communication processor (CP, e.g., modem), graphics processing unit (GPU), neural processing unit (NPU) (e.g., artificial intelligence (AI) chip), Wi-Fi chip, Bluetooth™ chip, GPS chip, near field communication (NFC) chip, connectivity chip, sensor controller, touch controller, fingerprint sensor controller, display driver integrated circuit (IC), audio CODEC chip, universal serial bus (USB) controller, camera controller, image processing IC, microprocessor unit (MPU), system-on-a-chip (SoC), IC, etc.

[0050] This disclosure relates to a compressor using an external rotor motor comprising an external rotor and a stator, and noise and vibration degradation can be prevented by preventing cracks in the external rotor.

[0051] Figure 1 This is a perspective view showing a compressor according to one or more embodiments of the present disclosure.

[0052] refer to Figure 1 The compressor 1 according to one or more embodiments of the present disclosure may include a housing 10.

[0053] The housing 10 forms the exterior of the compressor 1. The housing 10 is formed as a sealed container. The housing 10 may include a refrigerant inlet pipe 13 through which refrigerant flows in and a refrigerant discharge pipe 14 through which refrigerant is discharged (see...). Figure 2 ).

[0054] Compressor 1 can form a refrigeration cycle together with condenser, expansion valve and evaporator. In this case, refrigerant inlet pipe 13 can be connected to evaporator and refrigerant discharge pipe 14 can be connected to condenser.

[0055] The housing 10 may include an upper housing 11 and a lower housing 12. The upper housing 11 is coupled to the upper end of the lower housing 12 to form the housing 10.

[0056] The connection between the upper outer shell 11 and the lower outer shell 12 is sealed.

[0057] The lower outer casing 12 is provided with a refrigerant inlet pipe 13 and a refrigerant outlet pipe 14. The refrigerant inlet pipe 13 and the refrigerant outlet pipe 14 are connected to a compression component 80 located inside the outer casing 10.

[0058] Low-temperature / low-pressure refrigerant can flow into refrigerant inlet pipe 13. High-temperature / high-pressure refrigerant compressed in compression unit 80 can be discharged to the outside of housing 10 through refrigerant discharge pipe 14.

[0059] The base 15 supporting the outer casing 10 can be located at the bottom of the lower outer casing 12. The compressor 1 can be vertically mounted to the supporting surface via the base 15.

[0060] Figure 2 This is a cross-sectional view of a compressor according to one or more embodiments of the present disclosure. Figure 3 It shows Figure 2 A partially enlarged cross-sectional view of the compressor motor.

[0061] refer to Figure 2 and Figure 3 The compressor 1 according to one or more embodiments of the present disclosure may include a housing 10, a bearing housing 20, a motor 30, and a compression component 80.

[0062] The housing 10 forms the exterior of the compressor 1 and can be formed as a sealed container. The bearing housing 20, the motor 30, and the compression component 80 can be disposed inside the housing 10. The housing 10 may include a lower housing 12 and an upper housing 11 covering the upper side of the lower housing 12.

[0063] Housing 10 is formed by coupling the upper housing 11 and the lower housing 12. The interior of housing 10, except for the refrigerant inlet pipe 13 and the refrigerant outlet pipe 14, can be sealed. For example, refrigerant can flow into the interior of housing 10 through the refrigerant inlet pipe 13 and can be discharged to the outside of housing 10 through the refrigerant outlet pipe 14.

[0064] An oil tank 16 containing oil can be located in the lower part of the lower housing 12.

[0065] The bearing housing 20 is disposed inside the housing 10. The motor 30 may be disposed below the bearing housing 20, and the compression component 80 may be disposed above the bearing housing 20.

[0066] The bearing housing 20 can be located at the bottom of the lower housing 12. The bearing housing 20 can be supported by a pair of elastic support members 17 located at the bottom of the lower housing 12.

[0067] refer to Figure 2 and Figure 3 The bearing housing 20 may include a fixed shaft 21. The fixed shaft 21 may be formed to extend vertically downward from the lower surface of the bearing housing 20. The fixed shaft 21 may be formed in a cylindrical shape.

[0068] The shaft hole 22 can be formed inside the fixed shaft 21. The shaft hole 22 can be formed to have a circular cross section. The shaft hole 22 is formed to vertically penetrate the fixed shaft 21 and the bearing housing 20.

[0069] The outer peripheral surface of the fixed shaft 21 and the shaft hole 22 can be formed concentrically.

[0070] The stator 40 is disposed on the outer peripheral surface of the fixed shaft 21, and the rotating shaft 60 is inserted into the shaft hole 22 of the fixed shaft 21.

[0071] The inner circumferential surface of the shaft hole 22 is treated to act as a bearing surface supporting the rotation of the rotating shaft 60. Therefore, the rotating shaft 60 can rotate relative to the fixed shaft 21 while being inserted into the shaft hole 22.

[0072] Therefore, the center of the stator 40 and the center of the rotating shaft 60 (i.e., the center of the outer rotor 50) can be aligned by the fixed shaft 21.

[0073] A rotation prevention part 25 can be provided between the fixed shaft 21 and the lower surface of the bearing housing 20. The rotation prevention part 25 can be formed to prevent the stator 40 from rotating relative to the fixed shaft 21.

[0074] The bearing housing 20 may include a pair of legs 27 extending downward from its lower surface. The pair of legs 27 may be formed symmetrically about a fixed shaft 21. For example, the fixed shaft 21 may be disposed between the pair of legs 27.

[0075] To prevent interference between the stator 40 mounted on the fixed shaft 21 and the outer rotor 50 located outside the stator 40, the inner surfaces of the pair of legs 27 can be formed as concave curved surfaces corresponding to the outer peripheral surface of the outer rotor 50. The inner surfaces of the pair of legs 27 are spaced apart from the outer peripheral surface of the outer rotor 50 by a defined distance.

[0076] The lower surfaces of the pair of legs 27 can be supported by a pair of elastic supports 17. The upper end of the elastic support 17 can be fixed to the lower surface of the legs 27, and the lower end of the elastic support 17 can be fixed to the bottom of the lower housing 12. Each of the pair of elastic supports 17 can be formed by a helical spring.

[0077] The motor 30 may be disposed below the bearing housing 20. The motor 30 may be configured to generate a rotational force that operates the compression member 80. The motor 30 may include a stator 40 and an outer rotor 50.

[0078] The stator 40 can be disposed on the lower surface of the bearing housing 20. The stator 40 may include a stator core and coils. The stator core may be formed by laminating a pressed thin iron sheet.

[0079] The stator 40 may include a coupling hole 41. The coupling hole 41 is formed at the center of the stator 40 (i.e., the center of the stator core). The fixed shaft 21 of the bearing housing 20 can be inserted into the coupling hole 41.

[0080] The stator 40 can be fixed to the fixed shaft 21. The stator 40 can also be fixed to the fixed shaft 21 via a bracket 70. The bracket 70 can be disposed on the outer peripheral surface of the fixed shaft 21. When the bracket 70 is fixed to the fixed shaft 21, the stator 40 can be fixed to the bearing housing 20. When the stator 40 is fixed to the fixed shaft 21 via the bracket 70, the stator 40 cannot move up or down relative to the fixed shaft 21.

[0081] The outer rotor 50 is disposed outside the stator 40. For example, the stator 40 is disposed inside the outer rotor 50. Therefore, the outer rotor 50 can rotate around the stator 40 outside the stator 40.

[0082] The outer rotor 50 can be fixed to one end of the rotating shaft 60. Therefore, when the outer rotor 50 rotates, the rotating shaft 60 can rotate together with the outer rotor 50.

[0083] The outer rotor 50 can be formed into a circular container shape. In other words, the outer rotor 50 can be formed into a hollow cylinder shape that is closed at one end and open at the other end. The stator 40 can be housed inside the outer rotor 50.

[0084] The rotating shaft 60 is inserted into the shaft hole 22 of the fixed shaft 21 of the bearing housing 20. The rotating shaft 60 is rotatably supported by the shaft hole 22. Therefore, when the outer rotor 50 rotates, the rotating shaft 60 can rotate inside the shaft hole 22 of the fixed shaft 21.

[0085] A head component 61 is disposed at the top of the rotation shaft 60. The head component 61 is formed to have a diameter larger than the diameter of the rotation shaft 60. The head component 61 is formed to rotate integrally with the rotation shaft 60.

[0086] The bearing 69 is disposed between the head component 61 and the upper surface of the bearing housing 20. Therefore, when the rotating shaft 60 rotates, the head component 61 can rotate relative to the upper surface of the bearing housing 20.

[0087] A crankshaft 62 is disposed on the upper surface of the head member 61. The crankshaft 62 is formed perpendicular to the upper surface of the head member 61. The crankshaft 62 is formed eccentrically to the rotation axis 60. For example, the centerline of the rotation axis 60 is spaced apart from the centerline of the crankshaft 62 by a defined distance. A connecting rod 85 can be connected to the crankshaft 62.

[0088] The oil pump 63 can be located at the lower part of the rotating shaft 60. The lower part of the rotating shaft 60, where the oil pump 63 is located, is integrally coupled to the outer rotor 50. The lower end of the rotating shaft 60 can protrude below the outer rotor 50 and be immersed in the oil tank 16.

[0089] The rotating shaft 60 may include an oil supply channel. The oil supply channel may include: a first oil channel 64 formed vertically through the rotating shaft 60; and a second oil channel 65 formed in a spiral shape on the outer peripheral surface of the rotating shaft 60.

[0090] Therefore, when the rotating shaft 60 rotates, the oil in the oil tank 16 can be supplied upwards by the oil pump 63. Some of the oil supplied by the oil pump 63 can be supplied to the upper side of the rotating shaft 60 along the first oil passage 64. In addition, the remaining oil can be supplied between the outer peripheral surface of the rotating shaft 60 and the inner peripheral surface of the shaft hole 22 through the second oil passage 65.

[0091] The compression component 80 can be configured to compress and discharge the refrigerant introduced through the refrigerant inlet pipe 13. The compression component 80 can be disposed on the upper surface of the bearing housing 20.

[0092] The compression component 80 may include a cylinder 81, a piston 83, and a connecting rod 85.

[0093] A cylinder block 81 is formed on the upper surface of the bearing housing 20. A compression chamber 82 with a circular cross-section is formed inside the cylinder block 81. An inlet valve and a discharge valve are located at the outer end of the cylinder block 81.

[0094] The piston 83 is inserted into the cavity of the cylinder 81. The piston 83 is configured to reciprocate a defined distance linearly along the inner surface of the compression chamber 82 of the cylinder 81.

[0095] Piston 83 is connected to one end of connecting rod 85. The other end of connecting rod 85 is connected to crankshaft 62 of rotating shaft 60. Therefore, when rotating shaft 60 rotates, piston 83 can reciprocate linearly in compression chamber 82 of cylinder block 81 via crankshaft 62 and connecting rod 85.

[0096] When the piston 83 reciprocates linearly in the compression chamber 82 of the cylinder 81, the refrigerant can flow into the compression chamber 82 through the inlet valve, be compressed, and then be discharged to the outside of the compression chamber 82 through the discharge valve.

[0097] In the following text, reference will be made to Figures 4 to 12 The external rotor 50 used in a compressor 1 according to one or more embodiments of the present disclosure is described.

[0098] Figure 4 This is a perspective view showing an external rotor used in a compressor according to one or more embodiments of the present disclosure.

[0099] Figure 5 It shows Figure 4 A perspective view of the outer rotor after it has been flipped over.

[0100] Figure 6 It shows Figure 4 The cross-sectional view of the outer rotor taken along line AA.

[0101] Figure 7 It shows Figure 4 A cross-sectional view taken along line BB of the outer rotor.

[0102] Figure 8 It shows Figure 4 Exploded perspective view of the outer rotor.

[0103] Figure 9 yes Figure 4 Bottom view of the outer rotor.

[0104] Figure 10 This is a perspective view showing the core of an outer rotor according to one or more embodiments of the present disclosure.

[0105] Figure 11 This is a perspective view showing the top cover of an outer rotor according to one or more embodiments of the present disclosure.

[0106] Figure 12 This is a perspective view showing a bushing according to one or more embodiments of the present disclosure.

[0107] The outer rotor 50 can be formed into a circular container shape. In other words, the outer rotor 50 can be formed into a hollow cylinder shape that is closed at one end and open at the other end.

[0108] refer to Figures 4 to 9The outer rotor 50 according to one or more embodiments of the present disclosure may include a core 51, a plurality of permanent magnets 52, a top cover 53 and a bushing 54.

[0109] refer to Figure 4 , Figure 8 and Figure 10 The core 51 can be formed into a hollow cylindrical shape. The core 51 can be formed of metal. For example, the core 51 can be formed by laminating a pressed thin iron sheet.

[0110] The core 51 may include a plurality of magnet supports 511. The plurality of magnet supports 511 may be formed at regular intervals on the inner peripheral surface of the core 51. The plurality of magnet supports 511 may be formed to protrude from the inner peripheral surface of the core 51 toward the center of the core 51.

[0111] For example, the plurality of magnet supports 511 may be formed in a generally rectangular parallelepiped shape. The plurality of magnet supports 511 may be formed to have the same length as the core 51. Each of the plurality of magnet supports 511 may include a through hole 512 formed along the longitudinal direction of the core 51. When the outer rotor 50 is formed by injection molding, the plurality of through holes 512 may be filled with resin.

[0112] refer to Figure 4 and Figure 8 Multiple permanent magnets 52 can be disposed on the inner peripheral surface of the core 51. The multiple permanent magnets 52 can be disposed at regular intervals along the inner peripheral surface of the core 51. Each of the multiple permanent magnets 52 can be formed as a rectangular curved panel. Each of the multiple permanent magnets 52 can be formed as a curved panel with a curvature corresponding to the curvature of the inner peripheral surface of the core 51.

[0113] Multiple permanent magnets 52 can be disposed between multiple magnet supports 511 formed on the inner peripheral surface of the core 51. For example, a permanent magnet 52 can be disposed between two adjacent magnet supports 511. Therefore, the portion of the inner peripheral surface of the core 51 located between two adjacent magnet supports 511 forms the magnet mounting surface 513 to which the permanent magnet 52 is attached. The outer surface of the permanent magnet 52 is in close contact with the magnet mounting surface 513 of the core 51.

[0114] In this embodiment of the present disclosure, six magnet supports 511 are formed on the inner peripheral surface of the core 51, and six permanent magnets 52 are disposed on six magnet mounting surfaces 513 between the six magnet supports 511. However, the number of permanent magnets 52 is not limited thereto. The number of permanent magnets 52 can be determined in various ways depending on the performance required by the motor 30.

[0115] refer to Figures 4 to 8 and Figure 11 The top cover 53 can be configured to cover one end of the core 51. The top cover 53 can be formed in the shape of a circular container. For example, the top cover 53 can be formed in the shape of a hollow cylinder closed at one end.

[0116] The top cover 53 may include a disc 531 and a skirt 532.

[0117] A skirt 532 extends vertically from the edge of the disk 531. The skirt 532 may be formed with a stepped portion 5321. The stepped portion 5321 may be formed along the entire periphery of the skirt 532. The stepped portion 5321 may be formed at one end that contacts the core 51. For example, the stepped portion 5321 of the skirt 532 may be formed to be thicker than the end of the skirt 532 that contacts the disk 531. When the skirt 532 is formed with a stepped portion 5321, the weight of the top cover 53 can be reduced, and the strength of the top cover 53 can be increased.

[0118] At least one outer notch 55 may be formed on the outer peripheral surface of the top cover 53. The at least one outer notch 55 is formed to absorb circumferential deformation of the top cover 53 caused by temperature changes.

[0119] At least one outer notch 55 may be formed on the outer peripheral surface of the top cover 53 at a defined depth. At least one outer notch 55 may be formed to expose a portion of the core 51 and a plurality of permanent magnets 52. In other words, one end of the core 51 and one end of the permanent magnets 52 in contact with the top cover 53 may be exposed through the outer notch 55.

[0120] For example, at least one outer notch 55 may be formed on the disk 531 and the skirt 532 of the top cover 53. The outer notch 55 may be formed in a shape that extends through the skirt 532 in the radial direction of the top cover 53 and is recessed to a defined depth on the outer peripheral surface of the disk 531.

[0121] The outer notch 55 can be formed on the outer peripheral surface of the disk 531 to a depth corresponding to the thickness of the skirt 532. The portion of the outer notch 55 formed on the disk 531 can have a channel shape. In other words, the outer notch 55 formed on the disk 531 can have a U-shaped cross-section with a substantially flat bottom. The portion of the outer notch 55 formed on the skirt 532 can be formed to penetrate the skirt 532. Therefore, the interior and exterior of the top cover 53 can communicate with each other through the outer notch 55.

[0122] The width W1 of the outer slot 55 can be determined by the diameter of the outer peripheral surface of the top cover 53 and the amount of temperature change. For example, the outer slot 55 can be formed to have a width W1 of at least 1.0 mm. Here, the amount of temperature change refers to the change in the ambient temperature of the outer rotor 50 during the manufacture of the compressor 1.

[0123] In this embodiment of the present disclosure, the top cover 53 includes three outer slots 55. The three outer slots 55 may be formed at approximately 120-degree intervals. However, the number of outer slots 55 is not limited thereto. If desired, the top cover 53 may include a different number of outer slots 55.

[0124] The bushing hole 535 may be formed at the center of the top cover 53. The bushing hole 535 may be formed to extend vertically through the top cover 53. For example, the bushing hole 535 may be formed as a disk 531 extending vertically through the top cover 53.

[0125] The support wall 536 of the support bushing 54 can be formed on the inner surface of the disk 531 of the top cover 53. The support wall 536 can be formed around the bushing hole 535. The length from the outer surface of the disk 531 to one end of the support wall 536 can be formed to be approximately equal to the length of the bushing 54.

[0126] At least one inner groove 56 may be formed on the inner circumferential surface of the bushing bore 535. The inner groove 56 is formed to absorb circumferential deformation of the top cover 53 caused by temperature changes.

[0127] At least one inner groove 56 may be formed to vertically penetrate the top cover 53. For example, at least one inner groove 56 may be formed to vertically penetrate the disk 531 of the top cover 53. At least one inner groove 56 may be formed to vertically penetrate the support wall 536 provided at the edge of the bushing hole 535.

[0128] A bushing groove 537 may be formed on the inner circumferential surface of the bushing bore 535. The bushing groove 537 may be formed on the inner circumferential surface of the bushing bore 535 along the radial direction of the top cover 53. For example, the bushing groove 537 may be formed from the inner circumferential surface of the bushing bore 535 into the interior of the disk 531. The bushing groove 537 may be formed such that the flange 542 of the bushing 54 is inserted into the bushing groove 537. Therefore, the bushing groove 537 may be formed in a shape corresponding to the flange 542 of the bushing 54.

[0129] When the bushing 54 is disposed in the bushing hole 535 of the top cover 53, a portion of the bushing 54 may be exposed through at least one inner groove 56.

[0130] At least one inner groove 56 may be formed in the shape of a channel. In other words, the inner groove 56 may be formed in the shape of a U-shaped cross section with a substantially flat bottom.

[0131] The width W2 of the inner groove 56 can be determined by the diameter of the bushing hole 535 of the top cover 53 and the amount of temperature change. For example, the inner groove 56 can be formed to have a width of at least 0.2 mm.

[0132] In this embodiment of the present disclosure, the top cover 53 includes three inner slots 56. The three inner slots 56 may be formed to be spaced approximately 120 degrees apart. However, the number of inner slots 56 is not limited thereto. If desired, the top cover 53 may include a different number of inner slots 56.

[0133] The top cover 53 may include a plurality of extensions 533. The plurality of extensions 533 may extend from a surface of the top cover 53 that contacts the core 51. The plurality of extensions 533 may be formed to pass through through holes 512 of a plurality of magnet supports 511. More specifically, the plurality of extensions 533 may be formed to extend from a surface of the skirt 532 of the top cover 53 that contacts the core 51. The plurality of extensions 533 may extend vertically from a surface of the skirt 532.

[0134] An opening is formed between multiple extensions 533. Therefore, multiple permanent magnets 52 can be disposed in the opening between the multiple extensions 533.

[0135] In this embodiment of the present disclosure, since the core 51 includes six magnet supports 511, the top cover 53 includes six extensions 533. The six extensions 533 may be formed at regular intervals along the circumferential direction of the disk 531 of the top cover 53. For example, the six extensions 533 may be spaced apart at approximately 60 degrees.

[0136] The top cover 53 may include a support ring 534. The support ring 534 may be configured to support a plurality of permanent magnets 52.

[0137] A support ring 534 may be formed at the ends of the plurality of extensions 533. The support ring 534 may be formed in a ring shape to cover the other end of the core 51 and the other ends of the plurality of permanent magnets 52. The support ring 534 may be formed in a shape corresponding to a surface of the skirt 532 that contacts one end of the core 51 and one end of the plurality of permanent magnets 52. The support ring 534 may be formed parallel to one surface of the skirt 532. Therefore, six extensions 533 may be formed between the skirt 532 of the top cover 53 and the support ring 534.

[0138] The top cover 53 may include a plurality of assembly holes 57 formed adjacent to the outer peripheral surface of the top cover 53. In this embodiment of the present disclosure, the top cover 53 includes three assembly holes 57. The three assembly holes 57 may be formed between three outer slots 55. For example, the three assembly holes 57 may be formed at 120-degree intervals.

[0139] Assembly hole 57 can be formed in the skirt 532 of top cover 53. Assembly hole 57 can be formed to penetrate the skirt 532 of top cover 53 in the front-rear direction. Assembly hole 57 can be formed to penetrate the upper side of the stepped portion 5321 of the skirt 532 of top cover 53. Assembly hole 57 can be formed to not penetrate the stepped portion 5321 of the skirt 532 of top cover 53. A groove corresponding to assembly hole 57 can be formed on the outer peripheral surface of disk 531 of top cover 53.

[0140] Assembly hole 57 can be formed similarly to outer slot 55. However, the difference between assembly hole 57 and outer slot 55 is that assembly hole 57 does not penetrate the stepped portion 5321 of skirt 532, so core 51 and permanent magnet 52 are not exposed through assembly hole 57.

[0141] The assembly hole 57 can be used to fix the outer rotor 50 during the assembly of the outer rotor 50 and the stator 40. Additionally, after assembling the outer rotor 50 and the stator 40, the assembly status of the outer rotor 50 and the stator 40 can be inspected by inserting an inspection fixture into the assembly hole 57. For example, the assembly hole 57 can be used to assemble the outer rotor 50 and the stator 40.

[0142] Multiple noise holes 58 may be formed on one surface of the top cover 53. Multiple noise holes 58 may be formed in the disk 531 of the top cover 53. Multiple noise holes 58 may be formed around the bushing hole 535. For example, the top cover 53 may include three noise holes 58. The three noise holes 58 may be formed at approximately 120-degree intervals. The three noise holes 58 may be formed so as not to interfere with the three inner slots 56. The three noise holes 58 may be formed outside the three inner slots 56 based on the bushing hole 535.

[0143] Multiple noise holes 58 can reduce noise that may be generated when the outer rotor 50 rotates. Additionally, the multiple noise holes 58 can serve as oil drainage channels. For example, oil inside the outer rotor 50 can be drained to the outside of the outer rotor 50 through the multiple noise holes 58.

[0144] The top cover 53 can be formed of resin or plastic. For example, the top cover 53 can be formed of a different material than the core 51 and the bushing 54. In the case of the embodiments of this disclosure, the top cover 53 is formed of polybutylene terephthalate (PBT).

[0145] In addition, the top cover 53 can be formed from polycarbonate (PC), polyoxymethylene (POM), polyamide (PA), modified proline (PRO), acrylonitrile butadiene styrene (ABS), general-purpose polystyrene (GPPS), high-impact polystyrene (HIPS), high-density polyethylene (HDPE), polypropylene (PP), phenolic resin (PF), etc.

[0146] The bushing 54 can be disposed in the bushing hole 535 of the top cover 53.

[0147] refer to Figures 4 to 9 and Figure 12 The bushing 54 can be formed as a hollow cylinder. For example, a through hole 541 can be formed in the center of the bushing 54. The through hole 541 of the bushing 54 is formed so that the rotating shaft 60 can be inserted into the through hole 541. The outer rotor 50 can be coupled to the rotating shaft 60 through the bushing 54. Therefore, the outer rotor 50 can rotate integrally with the rotating shaft 60.

[0148] Flange 542 may be formed on the outer peripheral surface of bushing 54. Flange 542 may be formed at one end of bushing 54. Flange 542 may include at least one groove 543. At least one groove 543 may be formed on the outer peripheral surface of flange 542. At least one groove 543 may be formed to extend vertically through flange 542.

[0149] The bushing 54 can be inserted into the bushing bore 535 of the top cover 53. The bushing 54 can be supported by the support wall 536 of the top cover 53. The flange 542 of the bushing 54 can be inserted into the bushing groove 537 formed on the inner circumferential surface of the bushing bore 535 of the top cover 53. At least one groove 543 of the flange 542 can be configured to coincide with at least one inner groove 56 of the top cover 53. Therefore, the interior and exterior of the outer rotor 50 can communicate with each other through at least one inner groove 56 of the top cover 53 and at least one groove 543 of the flange 542 of the bushing 54.

[0150] At least one groove 543 of flange 542 can serve as an oil discharge channel. For example, oil inside outer rotor 50 can be discharged to the outside of outer rotor 50 through at least one groove 543 of flange 542.

[0151] In this embodiment of the present disclosure, since the top cover 53 includes three inner grooves 56, the bushing 54 includes three recesses 543 formed in the flange 542.

[0152] The bushing 54 can be formed of a metallic material. For example, the bushing 54 can be formed of steel.

[0153] A top cover 53 is coupled to a core 51, a plurality of permanent magnets 52, and a bushing 54 to form an outer rotor 50. The top cover 53 can be formed by injection molding resin or plastic. For example, the core 51, the plurality of permanent magnets 52, and the bushing 54 are disposed in an injection mold of the outer rotor, and then resin is injected into the injection mold to form the top cover 53. The top cover 53 can fix the core 51, the plurality of permanent magnets 52, and the bushing 54. For example, the top cover 53 can be formed as an injection molded object.

[0154] The top cover 53 prevents the multiple permanent magnets 52 from separating and physically connects the core 51 and the bushing 54 to transmit the rotational force generated by the multiple permanent magnets 52 and the stator 40 to the rotating shaft 60.

[0155] The process of molding the outer rotor 50 by injection molding the top cover 53 is performed at a high temperature. For example, the injection molding process of the outer rotor 50 can be performed at a temperature about 60°C higher than room temperature.

[0156] In addition, after assembling the compressor 1 including the outer rotor 50, a drying process is performed, wherein the compressor 1 is dried in a drying oven to remove moisture from inside the compressor 1. For example, the drying process of the compressor 1 can be performed at a temperature approximately 150°C higher than room temperature.

[0157] At this point, since the core 51 and bushing 54 are made of a metal such as steel, and the top cover 53 is made of resin or plastic, the length changes of the core 51 and bushing 54 due to temperature changes are different from the length changes of the top cover 53 due to temperature changes. Generally, resin or plastic has a linear expansion coefficient approximately 10 times that of metal. For example, when the temperature rises, the length extended by the top cover 53 can be greater than the length extended by the core 51 and bushing 54. Therefore, due to the difference in linear expansion coefficients, cracks may appear at the portions of the top cover 53 that contact the core 51 and the portions that contact the bushing 54.

[0158] Such cracks may occur when the outer rotor 50 used in the compressor 1 according to one or more embodiments of the present disclosure does not include at least one outer slot 55 and at least one inner slot 56.

[0159] Figure 13 This is a perspective view showing the outer rotor without the outer slot 55 and the inner slot.

[0160] refer to Figure 13 The outer rotor 50' may include a core 51, multiple permanent magnets 52, a top cover 53', and a bushing 54.

[0161] The core 51, the plurality of permanent magnets 52, and the bushing 54 are the same as those of the outer rotor 50 of the compressor 1 according to one or more embodiments of the present disclosure described above.

[0162] The top cover 53' may include six assembly holes 57 and three oil holes 59.

[0163] Six assembly holes 57 may be formed at regular intervals on the outer peripheral surface of the disk 531 of the top cover 53'. The six assembly holes 57 may be formed at intervals of approximately 60 degrees. The upper surface of the stepped portion 5321 of the skirt 532 may be exposed through the six assembly holes 57.

[0164] Three oil holes 59 may be formed around the bushing 54 of the top cover 53' at regular intervals. The three oil holes 59 may be formed to correspond to the three grooves 543 of the flange 542 of the bushing 54. The three oil holes 59 may be formed at intervals of approximately 120 degrees.

[0165] The top cover 53' does not include at least one outer slot and at least one inner slot. Otherwise, the top cover 53' is the same as the top cover 53 of the outer rotor 50 according to one or more embodiments of the present disclosure described above.

[0166] like Figure 13 As shown, when the top cover 53' does not include at least one outer slot, during the cooling of the outer rotor 50' after the injection molding process and during the cooling of the compressor 1 after the drying process of the compressor 1, the contact portion of the top cover 53' that contacts the core 51 will not deform as much as the coefficient of thermal expansion of the top cover 53'. Therefore, the portion of the top cover 53' that contacts the core 51 will not deform as much as the coefficient of thermal expansion of the top cover 53'. Thus, the portion of the top cover 53' that contacts the core 51 (e.g., in...) Figure 13 C1 appears in the part of the skirt 532 of the top cover 53' that contacts the core 51 and forms an assembly hole 57.

[0167] However, when at least one outer slot 55 is formed on the top cover 53 in the outer rotor 50 according to one or more embodiments of the present disclosure, the outer peripheral surface of the top cover 53 is not restricted by the core 51 and can freely deform the width of at least one outer slot 55, so that no cracks may appear on the outer peripheral surface of the top cover 53. For example, since the outer slot 55 can absorb the deformation of the top cover 53 in the circumferential direction, cracks can be prevented from appearing on the outer peripheral surface of the top cover 53.

[0168] In addition, such as Figure 13 As shown, when the top cover 53' does not include at least one inner groove, during the cooling of the outer rotor 50' after the injection molding process and during the cooling of the compressor 1 after the drying process of the compressor 1, the contact portion of the top cover 53' that contacts the bushing 54 will not deform as much as the coefficient of thermal expansion of the top cover 53'. Therefore, the portion of the top cover 53' that contacts the bushing 54 will not deform as much as the coefficient of thermal expansion of the top cover 53'. Thus, the portion of the top cover 53' that contacts the bushing 54 (e.g., in...) Figure 13 C2 appears in the part of the top cover 53' located between the oil hole 59 and the bushing 54 and in contact with the bushing 54.

[0169] However, when at least one inner groove 56 is formed on the top cover 53 in the outer rotor 50 according to one or more embodiments of the present disclosure, the inner circumferential surface of the bushing hole 535 of the top cover 53 is not restricted by the bushing 54 and can freely deform the width of at least one inner groove 56, so that cracks may not appear around the bushing hole 535 of the top cover 53. For example, since the inner groove 56 can absorb the deformation of the top cover 53 in the circumferential direction, cracks can be prevented from appearing around the bushing hole 535 of the top cover 53.

[0170] By forming the outer rotor 50 as described above, the compressor 1 according to one or more embodiments of the present disclosure can prevent cracks from appearing in the outer rotor 50. Therefore, air gap defects in the compressor 1 due to poor concentricity (runaway) of the outer rotor 50 can be prevented.

[0171] Furthermore, the outer rotor 50 according to one or more embodiments of this disclosure can prevent cracks from forming, thereby preventing imbalance of the outer rotor 50 due to cracks during operation of the compressor 1. Therefore, the noise and vibration characteristics of the compressor 1 can be prevented from deteriorating due to imbalance of the outer rotor 50.

[0172] In the above description, a reciprocating compressor is shown and described as an example of compressor 1, but this disclosure is not limited to reciprocating compressors. This disclosure can be applied to various types of compressors using an external rotor motor having an external rotor 50.

[0173] It will be understood that, according to the claims and description in the specification, various embodiments of this disclosure may be implemented in hardware, software, or a combination of hardware and software.

[0174] Any such software may be stored in a non-transitory computer-readable storage medium. The non-transitory computer-readable storage medium stores one or more computer programs (software modules) that include computer-executable instructions that, when executed by one or more processors of an electronic device, cause the electronic device to perform the methods of this disclosure.

[0175] Any such software may be stored in the form of volatile or non-volatile memory (e.g., a storage device such as read-only memory (ROM), whether erasable or rewritable), or in the form of memory (e.g., random access memory (RAM), memory chips, devices, or integrated circuits), or on optical or magnetic readable media such as CDs, DVDs, magnetic disks, or magnetic tapes. It will be understood that storage devices and storage media are various embodiments of non-transitory machine-readable storage suitable for storing one or more computer programs, said one or more computer programs including instructions that, when executed, implement various embodiments of this disclosure. Therefore, various embodiments are provided in this specification including programs including code for implementing the means or methods claimed by any one of the claims, and non-transitory machine-readable storage of such programs.

[0176] Although this disclosure has been shown and described with reference to various embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of this disclosure as defined by the appended claims and their equivalents.

Claims

1. An external rotor of a compressor, comprising: The core is formed into a hollow cylindrical shape; Multiple permanent magnets are disposed on the inner circumferential surface of the core; A top cover is configured to cover one end of the core and includes a bushing hole formed at the center of the top cover; as well as A bushing is provided in the bushing hole of the top cover. The core and bushing are made of metal, and the top cover is made of resin. The top cover includes: At least one inner groove is formed on the inner circumferential surface of the bushing bore; and At least one outer groove is formed on the outer peripheral surface of the top cover.

2. The external rotor of the compressor according to claim 1, wherein, The at least one outer slot is formed to expose part of the core and the plurality of permanent magnets.

3. The external rotor of the compressor according to claim 2, wherein, The at least one outer slot is formed in the shape of a channel and has a width of at least 1.0 mm.

4. The external rotor of the compressor according to claim 1, wherein, The at least one inner groove is formed to expose a portion of the bushing.

5. The external rotor of the compressor according to claim 4, wherein, The at least one inner groove is formed in the shape of a channel and has a width of at least 0.2 mm.

6. The external rotor of the compressor according to claim 1, wherein, The at least one inner groove includes three inner grooves.

7. The external rotor of the compressor according to claim 1, wherein, The at least one outer slot includes three outer slots.

8. The external rotor of the compressor according to claim 1, wherein, The core includes a plurality of magnetic supports formed at regular intervals on its inner circumferential surface. Each of the plurality of magnet supports includes a through hole formed along the longitudinal direction of the core, and The top cover also includes: Multiple extensions extend from a surface of the top cover that contacts the core and pass through through-holes in the multiple magnet supports; and A support ring, having a ring shape, is disposed at the lower end of the plurality of extensions to cover the other end of the core and the other end of the plurality of permanent magnets.

9. The external rotor of the compressor according to claim 1, wherein, The core and the bushing are made of steel, and The top cover is made of polybutylene terephthalate (PBT).

10. The external rotor of the compressor according to claim 1, wherein, The top cover includes a plurality of assembly holes formed adjacent to the edge of the top cover.

11. A compressor, comprising: shell; An outer rotor is rotatably disposed inside the housing; as well as The stator is disposed inside the outer rotor. The outer rotor includes: The core is formed into a hollow cylindrical shape; Multiple permanent magnets are disposed on the inner circumferential surface of the core; A top cover, configured to cover one end of the core, and including a bushing hole formed at the center of the top cover; and A bushing is provided in the bushing hole of the top cover. The core and the bushing are made of metal, and the top cover is made of resin. The top cover includes: At least one inner groove is formed on the inner circumferential surface of the bushing bore; and At least one outer groove is formed on the outer peripheral surface of the top cover.

12. The compressor according to claim 11, wherein, The at least one outer slot is formed to expose part of the core and the plurality of permanent magnets.

13. The compressor according to claim 12, wherein, The at least one outer slot is formed in the shape of a channel and has a width of at least 1.0 mm.

14. The compressor according to claim 11, wherein, The at least one inner groove is formed to expose a portion of the bushing.

15. The compressor according to claim 14, wherein, The at least one inner groove is formed in the shape of a channel and has a width of at least 0.2 mm.

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