A rotor assembly and compressor
By setting magnetic isolation holes on the balance block, the problem of magnetic leakage caused by magnetic conductive materials was solved, thereby improving the efficiency and lifespan of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI AOSONG REFRIGERATION EQUIPMENT CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-21
AI Technical Summary
In the existing technology, the use of balance blocks made of magnetically conductive materials leads to severe magnetic leakage, which increases motor losses and reduces efficiency.
Magnetic isolation holes are set on the balance block to isolate the closed-loop path of the leakage magnetic field and make the magnetic field more dispersed, thereby reducing the leakage magnetic field intensity and eddy current loss.
It effectively reduces the intensity of leakage magnetic field, improves motor efficiency and service life, and reduces eddy current loss.
Smart Images
Figure CN224537943U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of compressor technology, and more specifically, to a rotor assembly and a compressor. Background Technology
[0002] The rotor assembly in the motor includes a rotor body and balance blocks. The rotor body includes a rotor core, with permanent magnets inserted inside the rotor core. There are end plates on both ends of the rotor core to restrict the permanent magnets from extending beyond the rotor core. Balance blocks are provided on the end plates on both ends of the rotor core. The balance blocks play a role in balancing dynamic and static balance to counteract the imbalance of the pump body and improve the balance during rotation.
[0003] The selection of balance block materials and their impact on motor performance. Using non-magnetic materials as balance blocks can reduce leakage magnetic fields, thereby reducing motor and compressor losses and improving energy efficiency. However, the disadvantage of this method is the high manufacturing cost, as these non-magnetic materials typically need to be produced through powder metallurgy or casting processes.
[0004] If a balance block made of magnetically conductive material is used, part of the magnetic field generated by the permanent magnet in the rotor assembly will flow through the balance block made of magnetically conductive material, resulting in magnetic leakage. Utility Model Content
[0005] The purpose of this invention is to provide a rotor assembly and compressor that can reduce magnetic leakage when the balance block is made of a magnetically conductive material.
[0006] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a rotor assembly, comprising: The rotor body contains multiple magnets. The balance block is made of magnetically conductive material. It is connected to the rotor body and located at the axial end of the rotor body. Magnetic isolation holes are provided in the area formed by the sidewall of the balance block, and the magnetic isolation holes penetrate both ends of the balance block in the axial direction.
[0007] With the above settings, the magnetic isolation hole can block the closed-loop path of the leakage magnetic field passing through the balance block, thereby reducing the leakage magnetic field. Moreover, the setting of the magnetic isolation hole can make the closed-loop magnetic field passing through the balance block more dispersed, thereby reducing the leakage magnetic field intensity of the leakage magnetic field passing through the balance block, and also reducing eddy current losses, which can effectively improve the efficiency and service life of the motor.
[0008] In an optional implementation, the extension direction of the magnetic shielding hole is parallel to the axial direction of the rotor body.
[0009] In an optional implementation, the extension direction of the magnetic shielding hole forms an angle with the axial direction of the rotor body.
[0010] With the above configuration, when the extension direction of the magnetic isolation hole is parallel to the axial direction, the machining of the magnetic isolation hole can be facilitated. When the magnetic isolation hole is at an angle to the axial direction, magnetic leakage can be further reduced.
[0011] In an optional implementation, the balance block is provided with a plurality of magnetic isolation holes, each of which is axially opposite to a magnet.
[0012] With the above setup, the magnetic field originating from the N pole of the magnet opposite to the magnetic isolation hole is easily disrupted by the corresponding magnetic isolation hole, thus preventing the formation of a closed magnetic field and suppressing the leakage of magnetic flux in the rotor assembly 1.
[0013] In an optional implementation, the shape of the magnetic shielding hole is adapted to the shape of the magnet.
[0014] The above settings facilitate more precise alignment of the magnetic isolation hole with the corresponding magnet, and also make the processing of the magnetic isolation hole easier.
[0015] In an optional implementation, multiple adjacent magnetic isolation holes form a hole group, in which adjacent magnetic isolation holes are connected or spaced apart.
[0016] With the above arrangement, adjacent magnetic isolation holes in the hole group can be connected. Adjacent magnetic isolation holes in the hole group can also be spaced out to correspond to the corresponding magnets.
[0017] In an optional implementation, the axial projection area of the magnetic isolation hole includes the axial projection area of the corresponding magnet.
[0018] The above settings can further reduce the leakage flux caused by the balance block.
[0019] In an optional embodiment, the balance block includes multiple stacked balance plates, each balance plate having a through hole, and the through holes on the multiple balance plates together form a magnetic shielding hole.
[0020] With the above setup, the process cost of forming a balance block by stacking multiple balance plates is relatively low, thereby reducing the manufacturing cost of the balance block.
[0021] In an optional implementation, there are two balance blocks, with balance blocks provided at both ends of the rotor body; The balance block is also provided with a connection hole, and the rotor body is provided with a mating hole corresponding to the connection hole. The rotor assembly also includes fasteners, and the balance block is connected to the rotor body through the fasteners passing through the connection hole and the mating hole.
[0022] Secondly, the present invention provides a compressor, including a motor, wherein the motor includes a rotor assembly of any of the foregoing embodiments.
[0023] In an optional embodiment, the motor further includes a stator, with an air gap formed between the stator and the rotor body, and the minimum diameter of the magnetic isolation hole is greater than or equal to the ring width of the air gap.
[0024] The beneficial effects provided by this utility model embodiment include: This utility model embodiment provides a rotor assembly and a compressor. The compressor includes a rotor assembly, which includes a rotor body and a balance block. Multiple magnets are disposed within the rotor body. The balance block is made of magnetically conductive material and is connected to the rotor body, located at the axial end of the rotor body. Magnetic isolation holes are provided in the area formed by the sidewall of the balance block. These magnetic isolation holes isolate the magnetic flux flowing through the balance block, blocking the closed-loop path of the leakage magnetic field passing through the balance block, thereby reducing magnetic leakage. Furthermore, the magnetic isolation holes further disperse the closed-loop magnetic field passing through the balance block, thereby reducing the leakage magnetic field intensity and eddy current losses, effectively improving the efficiency and service life of the motor. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the rotor assembly provided in an embodiment of the present utility model; Figure 2 A cross-sectional schematic diagram of the rotor assembly provided in an embodiment of this utility model; Figure 3 An exploded view of the rotor assembly provided in an embodiment of this utility model; Figure 4 This is one of the structural schematic diagrams of the balance block provided in an optional embodiment of the present invention; Figure 5 A second schematic diagram of the structure of the balance block provided in an optional embodiment of this utility model; Figure 6 The third schematic diagram of the structure of the balance block provided in the optional embodiment of this utility model; Figure 7 One of the schematic diagrams showing the arrangement of magnets inside the rotor core provided in an optional embodiment of this utility model; Figure 8 Fourth schematic diagram of the structure of the balance block provided in an optional embodiment of this utility model; Figure 9 A second schematic diagram showing the arrangement of magnets inside the rotor core, provided as an optional embodiment of this utility model; Figure 10 An exploded schematic diagram of the balance block provided in an embodiment of this utility model.
[0027] Icons: 1-Rotor assembly; 100-Balance block; 101-Matching hole; 110-Balance plate; 111-Through hole; 120-Magnetic isolation hole; 130-Connecting hole; 200-Rotor body; 210-Rotor core; 220-Magnet; 230-Baffle; 300-Fastener. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0031] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0032] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0033] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.
[0034] It should be noted that the rotor assembly provided in this embodiment is used in a motor. The parallelism in this embodiment is not limited to being parallel in a strict sense; it is sufficient that the two are roughly parallel.
[0035] In related technologies, if a motor uses a balance block made of magnetically conductive material, and the rotor core contains magnets, the leakage magnetic field originates from the N pole of the magnets, passes through the air or a baffle, enters the balance block, passes through the balance block itself, and then passes through the air or a baffle back to the S pole of the magnets, forming a closed-loop magnetic circuit that does not participate in the motor's operation. This magnetic field contributes nothing to the motor's output and is called the leakage magnetic field. Because the balance block itself is magnetically conductive, the leakage magnetic field is relatively large. On the one hand, the magnetic conductivity of the balance block itself increases the strength of the leakage magnetic field, significantly reducing the beneficial main magnetic field of the motor; on the other hand, the balance block itself is a single unit, and the leakage magnetic field flows within it, creating significant eddy current losses, thus increasing the overall motor losses.
[0036] This utility model provides a rotor assembly that can reduce the closed-loop magnetic field flowing through the balance block, thereby reducing magnetic leakage and improving the energy efficiency of the motor.
[0037] The following describes in detail, with reference to the accompanying drawings, the specific structure of a rotor assembly provided by this utility model and its corresponding technical effects.
[0038] Please refer to Figures 1-3 The present invention provides a rotor assembly 1 including a rotor body 200 and a balance block 100. A plurality of magnets 220 are disposed within the rotor body 200. The balance block 100 is made of a magnetically conductive material and is connected to the rotor body 200 and located at the axial end of the rotor body 200. Magnetic isolation holes 120 are provided in the area formed by the sidewall of the balance block 100, and the magnetic isolation holes 120 penetrate both axial ends of the balance block 100.
[0039] In other words, the magnetic isolation hole 120 passes through the end of the balance block 100 near the rotor body 200 and the end away from the rotor body 200. It can be understood that the axial direction in this embodiment can be understood as the axial direction of the rotor body.
[0040] It should be noted that the balance block 100 in this embodiment is made of a magnetically conductive material. Magnetically conductive materials, also known as magnetic materials or soft magnetic materials, have the characteristic of being easily magnetized and demagnetized. The magnetically conductive material can be low-carbon steel, silicon steel, iron-nickel alloy, or cast iron, etc. In this embodiment, the magnet 220 can be a permanent magnet.
[0041] In detail, the rotor body 200 in this embodiment includes a rotor core 210, a plurality of magnets 220 and two baffles 230. The plurality of magnets 220 are disposed inside the rotor core 210, and the two baffles 230 are respectively disposed on the two end faces of the rotor core 210. The baffles 230 are used to restrict the magnets 220 from moving out of the rotor core 210.
[0042] Understandably, in some existing related technologies, to reduce manufacturing costs of the balance block 100 made of non-magnetic material, a balance block 100 made of magnetic material is used. The rotor core 210 contains magnets 220. A portion of the magnetic field generated by the magnets 220 does not pass entirely through the intended efficient magnetic circuit (such as the rotor core 210). Instead, it originates from the N pole of the magnets 220, passes through air or a baffle 230 into the magnetically conductive balance block 100, and then returns to the S pole of the magnets 220 through air or a baffle 230, forming a closed-loop magnetic circuit that does not participate in the motor's operation. This closed-loop magnetic circuit provides no benefit to the motor's output, and this magnetic field becomes a leakage magnetic field. Therefore, the balance block 100 attracts a portion of the magnetic flux that should be concentrated on the main working magnetic circuit, reducing the strength of the effective magnetic field (i.e., the main magnetic field) that directly contributes to the motor's output.
[0043] Furthermore, as a single magnetic conductor, the leakage magnetic field flowing inside the balance block 100 can cause significant eddy current losses. These eddy current losses are dissipated as heat, which not only wastes energy but may also cause the motor temperature to rise, affecting the motor's efficiency and lifespan.
[0044] In this embodiment, the balance block 100 is provided with a through-hole magnetic isolation hole 120. Due to the setting of the magnetic isolation hole 120, the magnetic flux flowing through the balance block 100 is isolated, which can block the closed-loop path of the leakage magnetic field passing through the balance block 100, thereby reducing the leakage magnetic field. Moreover, the setting of the magnetic isolation hole 120 can also make the closed-loop magnetic field passing through the balance block 100 more dispersed, thereby reducing the leakage magnetic field intensity of the leakage magnetic field passing through the balance block 100 and reducing eddy current losses, which can effectively improve the efficiency and service life of the motor.
[0045] Understandably, there are generally two balance blocks 100 in the rotor assembly 1. The two balance blocks 100 are respectively set at both ends of the rotor body 200. That is to say, there are balance blocks 100 at both ends of the rotor body 200. The two balance blocks 100 mainly play the role of balancing dynamic and static balance to counteract the imbalance of the pump body structure and ensure the balance of the rotor assembly 1 during rotation.
[0046] In detail, in this embodiment, the balance block 100 is also provided with a connection hole 130, and the rotor body 200 is provided with a mating hole 101 corresponding to the connection hole 130. The rotor assembly 1 also includes a fastener 300. The balance block 100 is connected to the rotor body 200 through the fastener 300 passing through the connection hole 130 and the mating hole 101. In detail, the baffle 230 is provided with a mating hole 101. That is, the fastener 300 can pass through the connection hole 130 on the balance block 100 and the mating hole 101 on the baffle 230 to connect the balance block 100 to the rotor body 200.
[0047] The fastener 300 can be a threaded fastener or a rivet. That is, the balance block 100 can be fixedly installed on the rotor body 200 by screws or rivets, which can ensure the connection strength between the balance block 100 and the rotor body 200, so that the rotor assembly 1 can rotate relatively balanced, thereby ensuring the working efficiency of the motor.
[0048] Optionally, the extension direction of the magnetic isolation hole 120 is parallel to the axial direction of the rotor body 200, that is, the magnetic isolation hole 120 extends along the axial direction of the rotor body 200, and the magnetic isolation hole 120 is a straight hole. This facilitates the fabrication of the magnetic isolation hole 120 on the balance block.
[0049] Alternatively, in some other embodiments, the extending direction of the magnetic isolation hole 120 may also be at an angle to the axial direction of the rotor body 200. That is, the magnetic isolation hole 120 may also be an oblique hole to reduce magnetic leakage.
[0050] A magnetic isolation hole 120 is axially opposite to at least one magnet 220. It should be noted that the relative position in this embodiment is not understood as a direct relative position. That is, in this embodiment, although the magnetic isolation hole 120 and the magnet 220 in the rotor body 200 are separated by a baffle 230, they only need to intersect at least partially in the axial projection area.
[0051] Understandably, this setup can significantly disrupt the closed-loop leakage magnetic field of the magnet 220 inside the rotor body 200 passing through the balance block 100, making the closed-loop magnetic field passing through the balance block 100 more dispersed, thereby reducing the leakage magnetic field intensity of the leakage magnetic field passing through the balance block 100.
[0052] Optionally, in this embodiment, a magnetic isolation hole 120 is opposite to a magnet 220. That is, the axial projection area of a magnetic isolation hole 120 intersects at least partially with the axial projection area of a magnet 220 in a rotor body 200. The magnetic isolation hole 120 will isolate the magnetic flux flowing through the balance block 100. Therefore, the magnetic field originating from the N pole of the magnet 220 opposite to the magnetic isolation hole 120 is easily destroyed by the corresponding magnetic isolation hole 120, so that a closed magnetic field cannot be formed, which can suppress the leakage of magnetic flux in the rotor assembly 1.
[0053] Of course, in some other embodiments, a magnetic isolation hole 120 is opposite to a plurality of magnets 220. In this embodiment, "plural" can be understood as two or more. That is, the axial projection area of a magnetic isolation hole 120 at least partially overlaps with the axial projection areas of the plurality of magnets 220.
[0054] For example, the axial projection area of a magnetic isolation hole 120 may at least partially overlap with the axial projection areas of two magnets 220, or the axial projection area of a magnetic isolation hole 120 may at least partially overlap with the axial projection areas of two magnets 220.
[0055] The balance block 100 is opposite to n magnets 220. In order to minimize the leakage magnetic flux caused by the balance block 100, in this embodiment, all the magnetic isolation holes 120 on the balance block 100 are opposite to the n magnets 220, and the number of n is greater than or equal to 1.
[0056] Please refer to Figure 3 For example, the balance block 100 is opposite to the four magnets 220, and all the magnetic isolation holes 120 on the balance block 100 are opposite to the four magnets 220.
[0057] Please refer to Figures 4-8 In this embodiment, the balance block 100 is provided with a plurality of magnetic isolation holes 120, and each magnetic isolation hole 120 is axially opposite to a magnet 220. That is to say, each magnetic isolation hole 120 on the balance block 100 corresponds to a magnet 220.
[0058] Please continue to refer to this. Figure 2 To further reduce magnetic flux leakage caused by the balance block 100, in this embodiment, the axial projection area of the magnetic isolation hole 120 includes the axial projection area of the corresponding magnet 220. It can be understood that each magnetic isolation hole 120 has a magnet 220 below it, and the axial projection area of the magnet 220 is included within the axial projection area of the magnetic isolation hole 120. This allows for more effective control of the magnetic field path, preventing the magnetic field from forming unnecessary closed loops through the magnetic balance block 100. This minimizes magnetic flux leakage, concentrating more magnetic flux of the magnet 220 within the intended working area.
[0059] In this embodiment, the shape of the magnetic isolation hole 120 is adapted to the shape of the magnet 220. That is, when the shape of a single magnet 220 is a sheet-like quadrilateral, the shape of the magnetic isolation hole 120 is also a quadrilateral hole adapted to the magnet 220. At this time, the radial length of the first hole is greater than the length of the magnet 220, and the radial width of the first hole is greater than the width of the magnet 220.
[0060] In other words, the fact that the shape of the magnetic isolation hole 120 is adapted to the shape of the magnet 220 can be understood as the shape of the magnetic isolation hole 120 being similar to the shape of the magnet 220. Furthermore, in this embodiment, the axial projection area of the magnetic isolation hole 120 includes the axial projection area of the magnet 220.
[0061] When a single magnet 220 has a cylindrical shape, the magnetic isolation hole 120 is a circular hole that matches the magnet 220. This facilitates more precise alignment of the magnetic isolation hole 120 with the corresponding magnet 220 and also makes the processing of the magnetic isolation hole 120 easier.
[0062] Please refer to Figures 4-9 In detail, in this embodiment, the magnet 220 is a sheet-like quadrilateral structure, and the magnetic isolation hole 120 is a strip-shaped hole adapted to it.
[0063] Optionally, multiple adjacent magnetic isolation holes 120 form a hole group, and adjacent magnetic isolation holes 120 within the hole group are connected or spaced apart.
[0064] Please refer to Figure 4 The two adjacent magnetic isolation holes 120 of the balance block 100 form a hole group, and the balance block 100 has only one hole group, with adjacent magnetic isolation holes 120 arranged at intervals within the hole group.
[0065] Please refer to Figure 5 Two adjacent magnetic isolation holes 120 of the balance block 100 form a hole group, and the balance block 100 has only one hole group, in which adjacent magnetic isolation holes 120 are connected.
[0066] Please refer to Figure 6 Two adjacent magnetic isolation holes 120 on the balance block 100 form a hole group, and the balance block 100 has two hole groups, and the magnetic isolation holes 120 in the hole group are connected.
[0067] Of course, in some other embodiments, the hole group may be formed by three or four adjacent magnetic isolation holes 120.
[0068] Therefore, the two adjacent magnetic isolation holes 120 on the balance block 100 can be spaced apart.
[0069] Please refer to Figures 4-6 The two adjacent magnetic isolation holes 120 on the balance block 100 can also be connected to facilitate the processing of adjacent holes.
[0070] In some alternative embodiments, the balance block 100 may have two adjacent magnetic isolation holes 120 spaced apart, or it may have two adjacent and connected magnetic isolation holes 120 at the same time.
[0071] In some optional embodiments, the balance block 100 includes a plurality of stacked balance plates 110, each balance plate 110 having a through hole 111, and the through holes 111 on the plurality of balance plates 110 together forming a magnetic shielding hole 120. Similarly, each balance plate 110 has a connecting hole 130, and the fastener 300 can sequentially pass through the connecting holes 130 on the plurality of balance plates 110 to connect with the mating hole 101 on the baffle 230.
[0072] Please refer to Figure 10 It is understandable that the balance block 100 is made up of multiple balance plates 110 stacked together. When making the balance block 100, the number of balance plates 110 can be adjusted to distribute the weight according to the condition of the motor.
[0073] It should be noted that, in order to ensure that each balance plate 110 is in a relatively fixed state when multiple balance plates 110 are stacked, in some embodiments, the balance plate 110 may be provided with a groove, which may be formed by stamping, and the back of the groove has a protrusion. For any two adjacent balance plates 110 in the axial direction, the protrusion of one balance plate 110 is disposed in the groove of the other balance plate 110. This arrangement can ensure that the multiple balance plates 110 stacked together are fixedly stacked together.
[0074] Furthermore, the process cost of forming the balance block 100 by stacking multiple balance plates 110 is relatively low, thereby reducing the manufacturing cost of the balance block 100.
[0075] This embodiment of the invention also provides a compressor, which includes a motor, and the motor includes the rotor assembly 1 described above. The compressor also includes a housing, cylinder, piston, and crankshaft, etc., with the crankshaft connecting the electric rotor to the compression mechanism (e.g., the piston). The cylinder is primarily the component where the compression process occurs, while the piston moves within the cylinder to compress the medium.
[0076] The motor also includes a stator, with an annular air gap formed between the stator and the rotor body 200. Optionally, to effectively avoid unnecessary closed loops formed by the magnetic field through the balance block 100, and to minimize the propagation of the magnetic field in unintended paths, thereby concentrating more magnetic flux in the effective operating area of the motor and optimizing the magnetic field distribution, the minimum diameter of the magnetic isolation hole 120 is greater than or equal to the annular width of the air gap.
[0077] In this embodiment, since the compressor includes a motor, and the motor includes the rotor assembly 1 described above, the compressor in this embodiment also has the same technical effects as the rotor assembly 1. Therefore, the technical effects of the compressor will not be described in detail here.
[0078] In summary, this utility model embodiment provides a rotor assembly 1 and a compressor. The compressor includes a rotor assembly 1, which includes a rotor body 200 and a balance block 100. The rotor body 200 contains a plurality of magnets 220. The balance block 100 is made of a magnetically conductive material and is connected to the rotor body 200, located at the axial end of the rotor body 200. The balance block 100 has magnetic isolation holes 120 that penetrate both ends of the balance block 100 in the radial direction. The magnetic isolation holes 120 isolate the magnetic flux flowing through the balance block 100, blocking the closed-loop path of the leakage magnetic field passing through the balance block 100, thereby reducing magnetic leakage. Furthermore, the magnetic isolation holes 120 further disperse the closed-loop magnetic field passing through the balance block 100, thereby reducing the leakage magnetic field intensity and eddy current losses, effectively improving the efficiency and service life of the motor.
[0079] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.
Claims
1. A rotor assembly, characterized in that, include: Rotor body (200), wherein a plurality of magnets (220) are provided inside the rotor body (200); The balance block (100) is made of magnetic material. The balance block (100) is connected to the rotor body (200) and located at the axial end of the rotor body (200). A magnetic isolation hole (120) is provided in the area formed by the side wall of the balance block (100). The magnetic isolation hole (120) passes through both ends of the balance block (100) in the axial direction.
2. The rotor assembly according to claim 1, characterized in that: The extension direction of the magnetic isolation hole (120) is parallel to the axial direction of the rotor body (200).
3. The rotor assembly according to claim 1, characterized in that: The extension direction of the magnetic isolation hole (120) is at an angle to the axial direction of the rotor body (200).
4. The rotor assembly according to claim 1, characterized in that: The balance block (100) is provided with a plurality of magnetic isolation holes (120), each of the magnetic isolation holes (120) being opposite to a magnet (220) in the axial direction.
5. The rotor assembly according to claim 4, characterized in that: The shape of the magnetic isolation hole (120) is adapted to the shape of the magnet (220).
6. The rotor assembly according to claim 4, characterized in that: Multiple adjacent magnetic isolation holes (120) form a hole group, wherein adjacent magnetic isolation holes (120) in the hole group are connected or spaced apart.
7. The rotor assembly according to claim 1, characterized in that: The projection area of the magnetic isolation hole (120) in the axial direction includes the projection area of the corresponding magnet (220) in the axial direction.
8. The rotor assembly according to claim 1, characterized in that: The balance block (100) includes a plurality of stacked balance plates (110), each balance plate (110) is provided with a through hole (111), and the through holes (111) on the plurality of balance plates (110) together form the magnetic isolation hole (120).
9. A compressor, characterized in that, Includes an electric motor, which includes the rotor assembly as described in any one of claims 1-8.
10. A compressor according to claim 9, characterized in that: The motor also includes a stator, which forms an annular air gap with the rotor body (200), and the minimum diameter of the magnetic isolation hole (120) is greater than or equal to the annular width of the air gap.