Rotor assembly, motor and compressor

Abstract

The utility model relates to the technical field of compressors, and discloses a rotor assembly. The rotor assembly comprises a rotor iron core, magnetic steel and an elastic extrusion part, and the rotor iron core is provided with an installation groove extending in the axial direction; the magnetic steel is arranged in the mounting groove; the elastic extrusion part is arranged at the end part of the rotor core along the axial direction, and the elastic extrusion part corresponds to the magnetic steel; the end portion of the magnetic steel protrudes out of the installation groove and abuts against the elastic extrusion portion so as to limit movement of the magnetic steel relative to the installation groove. An elastic extrusion part is arranged at the end part of the rotor core along the axial direction, and the end part of the magnetic steel protrudes out of the mounting groove and abuts against the elastic extrusion part, so that the elastic extrusion part can deform to generate a pressing force. Therefore, the magnetic steel can be stably fixed in the mounting groove, and the stability of the magnetic steel is improved. Meanwhile, the elastic extrusion part has elasticity and can provide mild extrusion force for the end part of the magnetic steel protruding out of the mounting groove, so that the magnetic steel can be prevented from being broken, and the quality of the rotor assembly is improved. The utility model further discloses a motor and a compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a rotor assembly, a motor and a compressor. BACKGROUND

[0002] At present, the rotor component in the variable frequency motor for the compressor is usually composed of a rotor core, a magnetic steel, a first end plate, a second end plate and a rivet. The magnetic steel installation groove is arranged in the rotor core, and the magnetic steel is installed in the groove. In order to facilitate the installation of the magnetic steel, a certain gap is usually left between the magnetic steel installation groove and the magnetic steel. When the rotor component rotates, the magnetic steel will shake in the installation groove due to the centrifugal force, thereby producing abnormal sound, and even causing the magnetic steel to break.

[0003] To solve the problem that the magnetic steel fluctuates up and down in the magnetic steel groove during the high-speed rotation of the compressor motor, the related technology discloses a rotor. The rotor comprises a core assembly, a magnetic steel and a first baffle, the core assembly comprises a plurality of rotor laminations stacked in the axial direction of the core assembly and a bottom plate located on one side of the plurality of rotor laminations, the plurality of rotor laminations are provided with accommodating holes in the axial direction of the core assembly, the bottom plate is provided with an extrusion part, the extrusion part is aligned with the accommodating holes; the magnetic steel is arranged in the accommodating holes of the plurality of rotor laminations; the first baffle is arranged at the end of the core assembly away from the bottom plate; wherein one end of the magnetic steel abuts against the extrusion part of the bottom plate, and the other end abuts against the first baffle. The axial length of the rotor lamination is greater than the length of the magnetic steel, so that the magnetic steel has a gap with both ends after being assembled in the core assembly, thereby preventing the magnetic steel from being crushed during riveting. The extrusion part comprises an elastic protrusion, and the elastic protrusion is in surface contact with the end part of the magnetic steel in the gap.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related technology:

[0005] In the related technology, the elastic protrusion of the extrusion part abuts against the end surface of the magnetic steel in the gap between the magnetic steel and the core assembly, which provides a certain degree of fixing effect, but the fixing effect is insufficient.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. Invention content

[0007] In order to have a basic understanding of some aspects of the disclosed embodiments, the following is a simple summary. The summary is not a general review, nor does it determine the key / important components or delineate the protection scope of these embodiments, but serves as a prelude to the detailed description below.

[0008] The embodiments of the present disclosure provide a rotor assembly, a motor and a compressor to improve the stability of the magnetic steel.

[0009] According to the first aspect of the embodiment of the utility model, a rotor assembly is provided, comprising: a rotor core, configured with an installation slot extending in the axial direction; a magnetic steel, arranged in the installation slot; an elastic extrusion part, arranged at the end of the rotor core in the axial direction, and the elastic extrusion part corresponds to the magnetic steel; wherein the end of the magnetic steel protrudes from the installation slot and abuts against the elastic extrusion part to limit the movement of the magnetic steel relative to the installation slot.

[0010] Optionally, the elastic extrusion part comprises: an elastic plate, arranged at the end of the rotor core in the axial direction; and an elastic sheet, arranged on the side of the elastic plate facing the installation slot, and the elastic sheet abuts against the end of the magnetic steel to cause elastic deformation of the elastic sheet.

[0011] Optionally, the elastic plate is attached to the end of the rotor core, and elastic grooves are formed in the elastic plate corresponding to the opposite sides of the magnetic steel, and the elastic sheets are formed in the elastic grooves; wherein the end of the magnetic steel is inserted into the elastic grooves and abuts against the elastic sheets.

[0012] Optionally, the total height of the rotor core and the elastic plate is less than the height of the magnetic steel, so that the elastic sheet deforms elastically when the end of the magnetic steel abuts against the elastic sheet.

[0013] Optionally, the height of the rotor core is L1, the height of the magnetic steel is L2, and the height of the elastic plate is L3, 0 < L2 - L1 - L3 ≤ 5 mm; and / or, 0.1 ≤ (L2 - L1 - L3) / L3 ≤ 2.

[0014] Optionally, the width of the magnetic steel is H2, the length of the magnetic steel is W2, the width of the elastic groove is H3, and the length of the elastic groove is W3, 1 ≤ H3 / H2 ≤ 3; and / or, 1 ≤ W3 / W2 ≤ 2.

[0015] Optionally, the width of the magnetic steel is H2, and the width of the elastic sheet is H31, 0.1 ≤ H31 / H2 ≤ 2.5.

[0016] Optionally, the rotor assembly further comprises: a first end plate, arranged at the end of the rotor core on the side away from the end of the rotor core of the elastic extrusion part; wherein the first end plate is provided with a relief groove corresponding to the magnetic steel.

[0017] Optionally, the height of the rotor core is L1, the height of the magnetic steel is L2, and the height of the first end plate is L4, L1 + L4 ≥ L2; and / or, the width of the relief groove is H4, the width of the magnetic steel is H2, 1 ≤ H4 / H2 ≤ 3; and / or, the length of the relief groove is W4, the length of the magnetic steel is W2, 1 ≤ W4 / W2 ≤ 2.

[0018] Optionally, the first end plate is arranged at a first end of the rotor core, and the rotor assembly further comprises: a second end plate arranged at a second end of the rotor core; and a fastener, a first end of the fastener being matched with the first end of the rotor core to fix the first end plate at the first end of the rotor core, and a second end of the fastener being matched with the second end of the rotor core to fix the second end plate at the second end of the rotor core.

[0019] According to a second aspect of the embodiment of the present application, a motor is provided, comprising the rotor assembly according to any one of the above disclosed embodiments.

[0020] According to a third aspect of the embodiment of the present application, a compressor is provided, comprising the motor according to the above disclosed embodiments.

[0021] The rotor assembly, the motor and the compressor provided by the embodiments of the present application can achieve the following technical effects:

[0022] The elastic extrusion part is arranged at the end of the rotor core along the axial direction, the end of the magnetic steel protrudes from the mounting groove and abuts against the elastic extrusion part, and the elastic extrusion part can be deformed to generate a pressing force. The magnetic steel can be stably fixed in the mounting groove by the pressing force of the elastic extrusion part, thereby improving the stability of the magnetic steel and limiting the movement of the magnetic steel relative to the mounting groove when the rotor assembly rotates. In this way, the abnormal sound generated by the magnetic steel shaking in the mounting groove during the operation of the compressor can be effectively reduced or avoided. At the same time, since the elastic extrusion part has elasticity, it can provide sufficient elastic deformation to adapt to the magnetic steel, so that the elastic extrusion part can provide a gentle extrusion force on the end of the magnetic steel protruding from the mounting groove. In this way, soft fixation of the magnetic steel can be achieved, excessive stress on the magnetic steel can be reduced, and the magnetic steel can be prevented from breaking, thereby improving the quality of the rotor assembly.

[0023] The foregoing general description and the following description are only exemplary and explanatory, and are not intended to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitation on the embodiments, elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute proportional limitation, and wherein:

[0025] Figure 1 is a structural schematic diagram of a rotor assembly provided by the embodiments of the present application;

[0026] Figure 2 is Figure 1 is a sectional view along the direction of A-A shown in the figure;

[0027] Figure 3 is a structural schematic diagram of another rotor assembly provided by the embodiments of the present application;

[0028] Figure 4 is Figure 3 a sectional view taken along the direction of the arrow B-B shown in FIG. 1, wherein the direction indicated by the arrow is the axial direction of the rotor core;

[0029] Figure 5 is a structural schematic view of an elastic extrusion part provided by the embodiment of the present disclosure;

[0030] Figure 6 is a structural schematic view of a first end plate provided by the embodiment of the present disclosure;

[0031] Figure 7 is a structural schematic view of a second end plate provided by the embodiment of the present disclosure.

[0032] Reference signs:

[0033] 10: rotor core; 101: first end of the rotor core; 102: second end of the rotor core;

[0034] 11: mounting groove;

[0035] 20: magnetic steel;

[0036] 30: elastic extrusion part; 31: elastic plate; 32: elastic sheet; 33: elastic groove;

[0037] 40: first end plate; 41: avoiding groove;

[0038] 50: second end plate;

[0039] 60: fastener. DETAILED DESCRIPTION

[0040] In order to be able to understand the features and technical contents of the embodiments of the present disclosure more thoroughly, the implementation of the embodiments of the present disclosure will be described in detail below in conjunction with the drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified.

[0041] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances in order to describe the embodiments of the present disclosure described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0042] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0043] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0044] Unless otherwise specified, the term "a plurality of" means two or more.

[0045] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the objects before and after it. For example, A / B means: A or B.

[0046] The term "and / or" is a description of the association between objects, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, the three relationships.

[0047] It should be noted that the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0048] In combination Figures 1-4 As shown in the drawings, the embodiments of the present disclosure provide a rotor assembly, which comprises a rotor core 10, a magnetic steel 20 and an elastic extrusion part 30.

[0049] The rotor core 10 is configured with a mounting groove 11 extending in the axial direction; the magnetic steel 20 is arranged in the mounting groove 11; the elastic extrusion part 30 is arranged at the end of the rotor core 10 in the axial direction, and the elastic extrusion part 30 corresponds to the magnetic steel 20; wherein the end of the magnetic steel 20 protrudes from the mounting groove 11 and abuts against the elastic extrusion part 30, so as to limit the movement of the magnetic steel 20 relative to the mounting groove 11.

[0050] The axial direction of the rotor core is shown as Figure 4 the arrow direction in the figure.

[0051] The elastic extrusion part 30 can be arranged at the upper end of the rotor core 10 along the axial direction, or arranged at the lower end of the rotor core 10 along the axial direction, or arranged at both ends of the rotor core 10 along the axial direction.

[0052] The rotor assembly provided by the embodiment of the present disclosure can deform the elastic extrusion part 30 to generate a pressing force by arranging the elastic extrusion part 30 at the end of the rotor core 10 along the axial direction, and protruding the end of the magnetic steel 20 from the mounting groove 11 and abutting against the elastic extrusion part 30. The magnetic steel 20 can be stably fixed in the mounting groove 11 by the pressing force of the elastic extrusion part 30, thereby improving the stability of the magnetic steel 20 and limiting the movement of the magnetic steel 20 relative to the mounting groove 11 when the rotor assembly rotates. In this way, the abnormal noise generated by the magnetic steel 20 shaking in the mounting groove 11 during the operation of the compressor can be effectively reduced or avoided.

[0053] Meanwhile, the elastic extrusion part 30 has elasticity, which can provide sufficient elastic deformation to adapt to the magnetic steel 20, so that the elastic extrusion part 30 can provide a gentle extrusion force to the end of the magnetic steel 20 protruding from the mounting groove 11. In this way, the magnetic steel 20 can be soft-fixed, the excessive stress on the magnetic steel 20 can be reduced, thereby preventing the magnetic steel 20 from breaking and improving the quality of the rotor assembly.

[0054] Optionally, in combination with Figure 4 and Figure 5 As shown, the elastic extrusion part 30 includes an elastic plate 31 and a spring piece 32. The elastic plate 31 is arranged at the end of the rotor core 10 along the axial direction. The spring piece 32 is arranged on the side of the elastic plate 31 facing the mounting groove 11, and the spring piece 32 abuts against the end of the magnetic steel 20 to cause the spring piece 32 to elastically deform.

[0055] The elastic plate 31 is arranged at the end of the rotor core 10 along the axial direction, which provides a stable support basis for the spring piece 32, can improve the stability of the spring piece 32, and thus improve the extrusion effect of the spring piece 32 on the end of the magnetic steel 20. In this way, the spring piece 32 can effectively exert a force on the magnetic steel 20.

[0056] Optionally, in combination with Figure 2 As shown, the rotor core 10 is provided with a plurality of mounting grooves 11, and the number of magnetic steels 20 is also a plurality. The plurality of magnetic steels 20 are arranged in the plurality of mounting grooves 11 respectively, and the number of spring pieces 32 is also a plurality. The plurality of spring pieces 32 correspond to the plurality of magnetic steels 20 one by one.

[0057] By arranging a plurality of spring pieces 32 on the elastic plate 31, the plurality of spring pieces 32 are used to fix the plurality of magnetic steels 20 respectively, which can improve the stability of the magnetic steels 20.

[0058] Optionally, in combination with Figure 4As shown, the elastic plate 31 is attached to the end of the rotor core 10, and the elastic grooves 33 are correspondingly formed along the opposite edges of the magnetic steel 20, and the elastic pieces 32 are formed in the elastic grooves 33; wherein the end of the magnetic steel 20 is clamped into the elastic groove 33 and abuts against the elastic piece 32.

[0059] The elastic groove 33 is a notch correspondingly formed along the opposite edges of the magnetic steel 20, and the elastic groove 33 allows the elastic plate 31 to have a certain elastic deformation space to adapt to the installation and fixation of the magnetic steel 20. The elastic piece 32 is formed in the elastic groove 33, and the elastic piece 32 can elastically deform relative to the elastic groove 33. The end of the magnetic steel 20 is clamped into the elastic groove 33 and abuts against the elastic piece 32, which can effectively fix and buffer the magnetic steel 20 and improve the stability of the magnetic steel 20.

[0060] The elastic plate 31 correspondingly forms the elastic grooves 33 along the opposite edges of the magnetic steel 20, so that the elastic pieces 32 are formed in the elastic grooves 33. The two ends of the elastic piece 32 are integrally connected with the elastic plate 31, and the other two ends of the elastic piece 32 are provided with the elastic grooves 33 between the elastic plate 31, so that the elastic piece 32 can move relative to the elastic groove 33. At this time, the elastic piece 32 as a part of the elastic plate 31 can provide uniform and stable extrusion force to the magnetic steel 20, effectively improving the extrusion fixation effect. Moreover, such elastic piece 32 has simple manufacturing process and is easy to process, and can also simplify the overall structure of the extrusion part.

[0061] The elastic grooves 33 are correspondingly formed along the opposite edges of the magnetic steel 20, which can be correspondingly formed along the two long edges of the magnetic steel 20, at this time, the two long edges of the elastic piece 32 formed in the elastic groove 33 have gaps between the elastic plate 31, and the two short edges of the elastic piece 32 are integrally connected with the elastic plate 31. Alternatively, the elastic grooves 33 can be correspondingly formed along the two short edges of the magnetic steel 20, at this time, the two short edges of the elastic piece 32 formed in the elastic groove 33 have gaps between the elastic plate 31, and the two long edges of the elastic piece 32 are integrally connected with the elastic plate 31.

[0062] Optionally, the elastic plate 31 is a metal elastic plate 31.

[0063] The metal elastic plate 31 has high strength and can provide stable fixation to the end of the magnetic steel 20, and has elasticity. The elastic plate 31 can be made of stainless steel material. The elastic plate 31 made of stainless steel material can produce large elastic deformation, and has good mechanical processing performance and is easy to process. At the same time, stainless steel also has high temperature resistance and is not easy to deform or damage, which can improve the stability and durability of the elastic plate 31.

[0064] Optionally, the elastic grooves 33 are formed through the elastic plate 31 along the height direction of the elastic plate 31.

[0065] The height direction of the elastic plate 31 is consistent with the axial direction of the rotor core 10. The elastic groove 33 is formed through the elastic plate 31 along the height direction of the elastic plate 31, so that the elastic piece 32 formed in the elastic groove 33 has a larger deformation range. When the elastic piece 32 abuts against the end of the magnetic steel 20, the larger deformation range allows the elastic piece 32 to more effectively cooperate with the end of the magnetic steel 20, thereby improving the fixing effect of the magnetic steel 20 and avoiding displacement of the magnetic steel 20 during high-speed rotation of the rotor.

[0066] Optionally, in combination with Figure 1 and Figure 4 It is shown that the total height of the rotor core 10 and the elastic plate 31 is less than the height of the magnetic steel 20, so that the elastic piece 32 is elastically deformed when the end of the magnetic steel 20 abuts against the elastic piece 32.

[0067] The height of the rotor core is shown as L1 in Figure 1 , the height of the magnetic steel is shown as L2 in Figure 4 , and the height of the elastic plate is shown as L3 in Figure 4 .

[0068] The elastic plate 31 is attached to the end of the rotor core 10, and the elastic groove 33 is formed in the elastic plate 31 corresponding to the opposite two sides of the magnetic steel 20. When the elastic piece 32 is formed in the elastic groove 33, the total height of the rotor core 10 and the elastic plate 31 is less than the height of the magnetic steel 20. In this way, the height of the rotor core 10 plus the height of the elastic plate 31 has a height difference with the height of the magnetic steel 20, so that the elastic piece 32 in the elastic groove 33 can abut against the end of the magnetic steel 20 and be deformed, thereby generating a pressing force on the end of the magnetic steel 20 by the elastic piece 32. The elastic piece 32 presses the magnetic steel 20 in the mounting groove 11 of the rotor core 10, which can effectively reduce or avoid the problem of abnormal noise and rupture caused by shaking of the magnetic steel 20.

[0069] Optionally, in combination with Figure 1 and Figure 4 It is shown that the height of the rotor core 10 is L1, the height of the magnetic steel 20 is L2, and the height of the elastic plate 31 is L3, 0 < L2-L1-L3 ≤ 5 mm; and / or, 0.1 ≤

[0070] (L2-L1-L3) / L3 ≤ 2.

[0071] The height direction of the rotor core 10, the height direction of the magnetic steel 20, and the height direction of the elastic plate 31 are consistent with the axial direction of the rotor core 10. The rotor core 10 is stacked by a plurality of rotor punching sheets, and the height of the rotor core 10 is L1 as shown in the figure. The elastic plate 31 is installed at the end of the rotor core 10 in the axial direction, and the height of the elastic plate 31 is L3 as shown in the figure. The elastic plate 31 is provided with an elastic sheet 32, which is arranged in the height direction of the magnetic steel 20, and the elastic sheet 32 wraps the end of the magnetic steel 20 to fix and support the magnetic steel 20. As shown in the figure, the height of the magnetic steel 20 is L2, and the height difference between the height of the rotor core 10 plus the height of the elastic plate 31 and the height of the magnetic steel 20 can make the elastic sheet 32 on the elastic plate 31 deformed to generate a pressing force.

[0072] In the case of providing the elastic groove 33 on the elastic plate 31 to form the elastic sheet 32, L2-L1-L3 is the height difference between the magnetic steel 20 and the rotor core 10 and the elastic plate 31. The height difference between the height of the magnetic steel 20 and the height of the rotor core 10 plus the height of the elastic plate 31 is the deformation distance of the elastic sheet 32.

[0073] When L2-L1-L3 is greater than 0, that is, the height difference is greater than 0, the elastic sheet 32 can generate a pressing force on the end of the magnetic steel 20, effectively preventing the magnetic steel 20 from shaking. When L2-L1-L3 is less than or equal to 5mm, that is, the height difference is less than or equal to 5mm, the magnetic steel 20 is not too high to cause the pressing force of the elastic sheet 32 to be too large, thereby preventing the magnetic steel 20 from being pressed to break. The embodiment of the disclosure limits 0 < L2-L1-L3 ≤ 5mm, which can improve the stability of the magnetic steel 20 while preventing the magnetic steel 20 from breaking.

[0074] It can be understood that L2-L1-L3 can be 1mm, 2mm, 3mm, 4mm, or 5mm.

[0075] In the case of providing the elastic groove 33 on the elastic plate 31 to form the elastic sheet 32, (L2-L1-L3) / L3 is the ratio between the height difference between the magnetic steel 20 and the rotor core 10 and the elastic plate 31 and the height of the elastic plate 31, which can reflect the deformation degree of the elastic sheet 32 when pressing the magnetic steel 20. Under the same deformation distance, the greater the height of the elastic sheet 32 in the elastic plate 31, the greater the pressing force generated.

[0076] When (L2-L1-L3) / L3 is greater than 0.1, the elastic sheet 32 can be deformed enough to adapt to the height difference between the magnetic steel 20 and the rotor core 10 and the elastic sheet 31, preventing the magnetic steel 20 from being damaged by hard pressing. When (L2-L1-L3) / L3 is less than or equal to 2, the height of the elastic sheet 31 is large enough to enable the elastic sheet 32 to generate greater pressing force on the magnetic steel 20. 0.1≤(L2-L1-L3) / L3≤2 can balance the deformation range and the pressing force of the elastic sheet 32, firmly fixing the magnetic steel 20 in the mounting groove 11 while preventing the magnetic steel 20 from being damaged.

[0077] It can be understood that (L2-L1-L3) / L3 can be 0.1, 0.5, 1, 1.2, 1.5, or 2.

[0078] Optionally, in combination with Figure 2 and Figure 5 It can be seen that the width of the magnetic steel 20 is H2, the length of the magnetic steel 20 is W2, the width of the elastic groove 33 is H3, and the length of the elastic groove 33 is W3, 1≤H3 / H2≤3; and / or, 1≤W3 / W2≤2.

[0079] When H3 / H2 is greater than or equal to 1, the width of the elastic groove 33 is greater than or equal to the width of the magnetic steel 20, enabling the magnetic steel 20 to be clamped into the elastic groove 33 of the elastic sheet 31 in the width direction, preventing the magnetic steel 20 from being displaced in the width direction. When H3 / H2 is less than or equal to 3, the gap between the elastic groove 33 and the magnetic steel 20 can be avoided from being too large, reducing the possibility of the magnetic steel 20 shaking in the elastic groove 33, and reducing noise and wear. 1≤H3 / H2≤3 can improve the clamping effect of the elastic groove 33 and the end of the magnetic steel 20 in the width direction, thereby improving the fixing stability of the magnetic steel 20 and reducing displacement of the magnetic steel 20 due to vibration or impact.

[0080] It can be understood that H3 / H2 can be 1, 1.2, 1.5, 2, 2.5, 2.8, or 3.

[0081] When W3 / W2 is greater than or equal to 1, the length of the elastic groove 33 is greater than the length of the magnetic steel 20, enabling the elastic groove 33 to be clamped into the elastic groove 33 of the elastic sheet 31 in the length direction, providing side support for the magnetic steel 20 and preventing the magnetic steel 20 from being displaced in the length direction. When W3 / W2 is less than or equal to 2, the length of the elastic groove 33 relative to the magnetic steel 20 can be avoided from being too large, enabling the elastic groove 33 to closely match the size of the magnetic steel 20, reducing the space for the magnetic steel 20 to shake in the elastic groove 33, and reducing noise and wear. 1≤W3 / W2≤2 can improve the clamping effect of the elastic groove 33 and the end of the magnetic steel 20 in the length direction, thereby improving the fixing stability of the magnetic steel 20.

[0082] It can be understood that W3 / W2 can be 1, 1.2, 1.5, 1.8 or 2.

[0083] The present application takes 1≤H3 / H2≤3 and 1≤W3 / W2≤2 as an example. In this way, the elastic groove 33 can improve the clamping effect of the elastic groove 33 and the end of the magnetic steel 20 in both width and length directions.

[0084] Optionally, in combination with Figure 2 , Figure 5 As shown in the drawings, the width of the magnetic steel 20 is H2, and the width of the elastic sheet 32 is H31, and 0.1≤H31 / H2≤2.5.

[0085] The elastic groove 33 is formed in the elastic plate 31 along the opposite edges of the magnetic steel 20, and the length direction of the elastic groove 33 is the direction in which the elastic groove 33 is formed on the elastic plate 31. The elastic sheet 32 is formed in the elastic groove 33, the length direction of the elastic sheet 32 is consistent with the length direction of the elastic groove 33, and the length of the elastic sheet 32 is equal to the length of the elastic groove 33. The width H31 of the elastic sheet 32 refers to the length of the two edges of the elastic sheet 32 integrally connected with the elastic plate 31.

[0086] When H31 / H2 is greater than or equal to 0.1, the elastic sheet 32 can wrap part or all of the end of the magnetic steel 20 in width. In this way, the elastic sheet 32 can effectively wrap the end of the magnetic steel 20, realize the compression of the magnetic steel 20, and improve the stability of the magnetic steel 20. When H31 / H2 is less than or equal to 2.5, the width of the elastic sheet 32 can be avoided to be too large. In this way, the magnetic steel 20 will not be excessively wrapped, and the difficulty of installation or uneven stress of the magnetic steel 20 caused by the too wide elastic sheet 32 is prevented. The present application limits 0.1≤H31 / H2≤2.5, which can make the end of the magnetic steel 20 fully cooperate with the elastic sheet 32, and the elastic sheet 32 effectively fix the end of the magnetic steel 20.

[0087] It can be understood that H31 / H2 can be 0.1, 0.5, 1, 1.5, 2, 2.5, etc.

[0088] Optionally, in combination with Figure 1 , Figure 4 and Figure 6 As shown in the drawings, the rotor assembly further comprises a first end plate 40, the first end plate 40 is arranged at the end of the rotor core 10 and is located on the side away from the end of the rotor core 10 of the elastic extrusion part 30; wherein the first end plate 40 is provided with a avoiding groove 41, the avoiding groove 41 corresponds to the magnetic steel 20.

[0089] The first end plate 40 is provided with an avoiding groove 41 at the position corresponding to the magnetic steel 20, the avoiding groove 41 provides avoiding space for the protruding part of the end of the magnetic steel 20 and the deformation of the elastic sheet 32, so as to avoid the interference between the magnetic steel 20, the elastic sheet 32 and the first end plate 40. In this way, the deformation of the elastic sheet 32 can be avoided, and the damage to the magnetic steel 20 can also be prevented.

[0090] Optionally, in combination with Figure 1 and Figure 4 As shown in the figure, the height of the rotor core 10 is L1, the height of the magnetic steel 20 is L2, and the height of the first end plate 40 is L4, L1+L4≥L2.

[0091] The height of the first end plate 40 is shown as L4 in the figure. The height of the rotor core 10 is L1, the height of the magnetic steel 20 is L2, and the height of the elastic plate 31 is L3. The elastic piece 32 is arranged in the elastic groove 33 of the elastic plate 31. In order to avoid the end of the magnetic steel 20 and the elastic piece 32 from protruding from the upper end surface of the first end plate 40, it is necessary to satisfy L1+L3+L4≥L2+L3, that is, L1+L4≥L2. In this way, the first end plate 40 can provide sufficient fixing and supporting effect for the elastic plate 31 and the magnetic steel 20, thereby improving the stability of the rotor assembly.

[0092] Optionally, in combination with Figure 2 and Figure 6 As shown in the figure, the width of the avoidance groove 41 is H4, the width of the magnetic steel 20 is H2, and 1≤H4 / H2≤3.

[0093] When H4 / H2 is greater than or equal to 1, the width of the avoidance groove 41 is greater than or equal to the width of the magnetic steel 20. At this time, the avoidance groove 41 can provide sufficient avoidance space in width, so that the magnetic steel 20 and the elastic piece 32 can extend into the avoidance groove 41. In this way, direct contact between the end of the magnetic steel 20 and the elastic piece 32 and the first end plate 40 can be avoided or reduced. When H4 / H2 is less than or equal to 3, the width of the avoidance groove 41 does not exceed three times the width of the magnetic steel 20, which can form appropriate limiting for the end of the magnetic steel 20 and the elastic piece 32, thereby improving the stability. In this way, it can also avoid that the avoidance groove 41 is too large to affect the structural strength of the first end plate 40.

[0094] The embodiment of the present disclosure limits 1≤H4 / H2≤3, which can provide sufficient avoidance space for the end of the magnetic steel 20 and the elastic piece 32, while also improving the stability of the rotor assembly and enhancing the structural strength of the first end plate 40.

[0095] It can be understood that H4 / H2 can be 1, 1.2, 1.5, 2, 2.2, 2.5, 2.8, 3.

[0096] Optionally, in combination with Figure 2 and Figure 6 As shown in the figure, the length of the avoidance groove 41 is W4, the length of the magnetic steel 20 is W2, and 1≤W4 / W2≤2.

[0097] When W4 / W2 is greater than or equal to 1, the length of the avoiding groove 41 is greater than or equal to the length of the magnetic steel 20, at this time, the avoiding groove 41 can provide sufficient avoiding space in length, so that the magnetic steel 20 and the elastic sheet 32 can extend into the avoiding groove 41. In this way, direct contact between the end of the magnetic steel 20 and the elastic sheet 32 and the first end plate 40 can be avoided or reduced. When W4 / W2 is less than or equal to 3, the width of the avoiding groove 41 does not exceed three times the width of the magnetic steel 20, which can form appropriate limiting for the end of the magnetic steel 20 and the elastic sheet 32, thereby improving stability. In this way, it can also avoid that the avoiding groove 41 is too large to affect the structural strength of the first end plate 40.

[0098] The embodiments of the present disclosure limit 1≤W4 / W2≤2, which can provide sufficient avoiding space for the end of the magnetic steel 20 and the elastic sheet 32, while also improving the stability of the rotor assembly and enhancing the structural strength of the first end plate 40.

[0099] It can be understood that W4 / W2 can be 1, 1.2, 1.5, 2, 2.2, 2.5, 2.8, 3.

[0100] The present application takes 1≤H4 / H2≤3 and 1≤W4 / W2≤2 as an example. In this way, the avoiding groove 41 can provide sufficient avoiding space in width and length, thereby improving the stability of the rotor assembly.

[0101] Optionally, in combination with Figure 2 and Figure 6 It is shown that the number of magnetic steels 20 is multiple, and the number of avoiding grooves 41 is multiple, and the multiple avoiding grooves 41 correspond to the multiple magnetic steels 20 one by one.

[0102] Through the setting of the multiple avoiding grooves 41, the multiple magnetic steels 20 can be more effectively limited and protected.

[0103] Optionally, in combination with Figure 1 , Figure 4 , Figure 6 and Figure 7 It is shown that the first end plate 40 is arranged at the first end 101 of the rotor core, and the rotor assembly further comprises a second end plate 50 and a fastener 60. The second end plate 50 is arranged at the second end 102 of the rotor core; the first end of the fastener 60 is matched with the first end 101 of the rotor core, so that the first end plate 40 is fixed to the first end 101 of the rotor core, and the second end of the fastener 60 is matched with the second end 102 of the rotor core, so that the second end plate 50 is fixed to the second end 102 of the rotor core.

[0104] The first end plate 40 is arranged at the first end 101 of the rotor core, the first end of the fastener 60 is matched with the first end 101 of the rotor core, and the first end plate 40 can be fixed to the first end 101 of the rotor core. The second end plate 50 is arranged at the second end 102 of the rotor core, the second end of the fastener 60 is matched with the second end 102 of the rotor core, and the second end plate 50 can be fixed to the second end 102 of the rotor core. The rotor core 10 is sealed at both ends by the first end plate 40 and the second end plate 50, which can prevent the magnetic steel 20 from falling off.

[0105] The fastener 60 can be a rivet. The rivet penetrates the rotor core 10 and the first end plate 40 and the second end plate 50, and the first end plate 40 and the second end plate 50 are respectively fixed and connected to the two ends of the rotor core 10, which can improve the stability of the rotor assembly.

[0106] The extrusion part can be arranged between the first end plate 40 and the first end 101 of the rotor core, between the second end plate 50 and the second end 102 of the rotor core, or between the first end plate 40 and the first end 101 of the rotor core and between the second end plate 50 and the second end 102 of the rotor core. The extrusion part is arranged between the first end plate 40 and the first end 101 of the rotor core in this application.

[0107] The first end 101 of the rotor core is the upper end of the rotor core 10, and the second end 102 of the rotor core is the lower end of the rotor core 10. The extrusion part includes an elastic plate 31 and a spring piece 32 arranged on the elastic plate 31. The magnetic steel 20 is arranged in the mounting groove 11 of the rotor core 10, the second end 102 of the rotor core is provided with the second end plate 50, and the lower end of the magnetic steel 20 is limited by the second end plate 50. The first end 101 of the rotor core is provided with the elastic plate 31, the elastic plate 31 is provided with elastic grooves 33 along the opposite edges of the upper end of the magnetic steel 20, the elastic grooves 33 penetrate along the height direction of the elastic plate 31, and the spring piece 32 is formed between the elastic grooves 33. The first end plate 40 is arranged above the elastic plate 31, and the first end plate 40 is correspondingly provided with a avoiding groove 41 facing the upper end of the magnetic steel 20 and the spring piece 32. The upper end of the magnetic steel 20 protrudes from the mounting groove 11 and abuts against the spring piece 32, the spring piece 32 is deformed upward, the upper end of the magnetic steel 20 and the spring piece 32 extend into the avoiding groove 41. In this way, the upper end of the magnetic steel 20 is limited in the avoiding groove 41, and the spring piece 32 forms a downward pressing force on the upper end of the magnetic steel 20, which can prevent the magnetic steel 20 from moving in the mounting groove 11. The first end plate 40 and the second end plate 50 are stably connected to the rotor core 10 by rivets.

[0108] The motor provided by the embodiment of the present disclosure comprises the rotor assembly as any one of the above embodiments.

[0109] The motor provided by the embodiments of the present disclosure includes the rotor assembly as described in any of the above embodiments, and thus includes all the advantages of the rotor assembly as described in any of the above embodiments, which will not be repeated here.

[0110] The motor described in the embodiments of the present disclosure includes a variable frequency motor.

[0111] The compressor provided by the embodiments of the present disclosure includes the motor as described in the above embodiments, and thus includes the advantages of the motor as described in the above embodiments, which will not be repeated here.

[0112] The compressor provided by the embodiments of the present disclosure includes the motor as described in the above embodiments, and thus includes the advantages of the motor as described in the above embodiments, which will not be repeated here.

[0113] The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable one skilled in the art to practice them. Other embodiments can include structural and other changes. The embodiments are merely representative of the possible variations. Individual components and functions are optional unless explicitly required, and the order of operations can be varied. Portions and features of some embodiments can be included in, or alternate, portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and can be variously modified and changed without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A rotor assembly characterized by, The rotor assembly comprises: a rotor core configured with an installation slot extending in an axial direction; a magnetic steel arranged in the installation slot; an elastic extrusion part arranged at an end of the rotor core in the axial direction, and the elastic extrusion part corresponds to the magnetic steel; a first end plate arranged at the end of the rotor core, and the first end plate is located at a side of the elastic extrusion part away from the end of the rotor core, and the first end plate is provided with a relief slot corresponding to the magnetic steel; wherein an end of the magnetic steel protrudes out of the installation slot and abuts against the elastic extrusion part to limit the movement of the magnetic steel relative to the installation slot.

2. The rotor assembly of claim 1, wherein The elastic extrusion part comprises: an elastic plate arranged at the end of the rotor core in the axial direction; an elastic sheet arranged at a side of the elastic plate facing the installation slot, and the elastic sheet abuts against the end of the magnetic steel to cause elastic deformation of the elastic sheet.

3. The rotor assembly according to claim 2, wherein the elastic plate is attached to the end of the rotor core, and the elastic plate is provided with elastic slots corresponding to opposite sides of the magnetic steel, and the elastic sheet is formed in the elastic slots; wherein the end of the magnetic steel is inserted into the elastic slots and abuts against the elastic sheet.

4. The rotor assembly according to claim 3, wherein a total height of the rotor core and the elastic plate is less than a height of the magnetic steel, so that the elastic sheet is elastically deformed when the end of the magnetic steel abuts against the elastic sheet.

5. The rotor assembly of claim 4, wherein The height of the rotor core is L1, the height of the magnetic steel is L2, and the height of the elastic plate is L3, 0 < L2-L1-L3 ≤ 5 mm; and / or, 0.1 ≤ (L2-L1-L3) / L3 ≤ 2.

6. The rotor assembly of claim 3, wherein The width of the magnetic steel is H2, the length of the magnetic steel is W2, the width of the elastic slot is H3, and the length of the elastic slot is W3, 1 ≤ H3 / H2 ≤ 3; and / or, 1 ≤ W3 / W2 ≤ 2.

7. The rotor assembly according to claim 3, wherein the width of the magnetic steel is H2, and the width of the elastic sheet is H31, 0.1 ≤ H31 / H2 ≤ 2.

5.

8. The rotor assembly according to claim 1, wherein the height of the rotor core is L1, the height of the magnetic steel is L2, and the height of the first end plate is L4, L1+L4 ≥ L2; and / or, the width of the relief slot is H4, the width of the magnetic steel is H2, 1 ≤ H4 / H2 ≤ 3; and / or, the length of the relief slot is W4, the length of the magnetic steel is W2, 1 ≤ W4 / W2 ≤ 2.

9. The rotor assembly of claim 1, wherein, The first end plate is arranged at a first end of the rotor core, and the rotor assembly further comprises: a second end plate arranged at a second end of the rotor core; a fastener, a first end of the fastener is matched with the first end of the rotor core to fix the first end plate at the first end of the rotor core, and a second end of the fastener is matched with the second end of the rotor core to fix the second end plate at the second end of the rotor core.

10. An electric machine characterized by The motor comprises the rotor assembly according to any one of claims 1 to 9.

11. A compressor characterized by, The motor comprises the rotor assembly according to claim 10.

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