Rotor core, permanent magnet motor and compressor

Abstract

The present invention provides a rotor core, a permanent magnet motor and a compressor, wherein the rotor core comprises a plurality of permanent magnet slots, wherein the plurality of permanent magnet slots penetrate the rotor core along the axial direction of the rotor core; a plurality of magnetic isolation slot groups, wherein the plurality of magnetic isolation slot groups are respectively arranged between any one of the plurality of permanent magnet slots and the outer contour of the rotor core, wherein the plurality of magnetic isolation slot groups correspond to the plurality of permanent magnet slots one by one, and any one of the plurality of magnetic isolation slot groups comprises at least two magnetic isolation slots; wherein, in a plane perpendicular to the central axis of the rotor core, a straight line connecting the two ends of any one of the at least two magnetic isolation slots is a magnetic isolation slot trend line, and the intersection point of at least two magnetic isolation slot trend lines corresponding to any one of the plurality of magnetic isolation slot groups is located inside the rotor core. The rotor core provided by the present invention reduces noise and improves the efficiency of the permanent magnet motor by arranging magnetic isolation slot groups and making the intersection point of at least two magnetic isolation slot trend lines corresponding to any one of the plurality of magnetic isolation slot groups located inside the rotor core.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a rotor core, a permanent magnet motor and a compressor. Background Art

[0002] Improving the efficiency and reducing the noise of variable frequency compressors has been an important topic in the compressor field in recent years. Permanent magnet motors, as the driving motors of variable frequency compressors, play a vital role in improving the efficiency and reducing the noise of compressors.

[0003] The torque of a permanent magnet motor consists of two parts: permanent magnet torque and reluctance torque. In smaller power applications, such as rotary compressors, permanent magnet torque is the main component; however, in larger power applications, such as scroll compressors, the proportion of reluctance torque increases. When designing a permanent magnet motor, it is necessary to fully consider how to effectively utilize the reluctance torque.

[0004] The permanent magnet motor in the prior art has the characteristics of excellent noise index by setting a slit on the outside of the permanent magnet slot of the rotor core to guide the magnetic circuit to converge to the outside of the rotor. However, this solution is only applicable to the field of motors with lower power. In the field of motors with higher power, since the reluctance torque accounts for a large proportion, the above solution will bring about problems such as reducing the reluctance torque and reducing the motor efficiency. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] To this end, a first aspect of the present invention is to provide a rotor core.

[0007] A second aspect of the present invention is to provide a permanent magnet motor.

[0008] A third aspect of the present invention is to provide a compressor.

[0009] In view of this, according to a first aspect of the present invention, a rotor core is provided for a permanent magnet motor, the rotor core comprising: a plurality of permanent magnet slots, the plurality of permanent magnet slots extending through the rotor core in the axial direction of the rotor core; a plurality of magnetic isolation slot groups, the plurality of magnetic isolation slot groups being respectively arranged between any one of the plurality of permanent magnet slots and an outer contour of the rotor core, the plurality of magnetic isolation slot groups corresponding one-to-one to the plurality of permanent magnet slots, any one of the plurality of magnetic isolation slot groups comprising at least two magnetic isolation slots; wherein, in a plane perpendicular to the central axis of the rotor core, a straight line connecting the two ends of any one of the at least two magnetic isolation slots is a magnetic isolation slot trend line, and an intersection of at least two magnetic isolation slot trend lines corresponding to any one of the plurality of magnetic isolation slot groups is located inside the rotor core.

[0010] The rotor core provided by the present invention comprises a plurality of permanent magnet slots and a plurality of magnetic isolation slot groups, and the plurality of permanent magnet slots penetrate the rotor core along the axial direction of the rotor core, wherein the plurality of magnetic isolation slot groups are respectively arranged between any one of the plurality of permanent magnet slots and the outer contour of the rotor core, and the plurality of magnetic isolation slot groups correspond one-to-one to the plurality of permanent magnet slots, each magnetic isolation slot group comprises at least two magnetic isolation slots, and in a plane perpendicular to the central axis of the rotor core, a straight line connecting the two ends of any magnetic isolation slot is set as a magnetic isolation slot trend line, and the intersection point of at least two magnetic isolation slot trend lines corresponding to any one of the plurality of magnetic isolation slot groups is located inside the rotor core, and the plurality of magnetic isolation slot groups are arranged to improve the noise indicators such as the tooth slot torque of the permanent magnet motor, thereby reducing the noise of the permanent magnet motor during operation, and further, the intersection point of at least two magnetic isolation slot trend lines corresponding to any one of the plurality of magnetic isolation slot groups is arranged to be located inside the rotor core, which can provide a smooth magnetic path for the reluctance torque of the permanent magnet motor, thereby increasing the proportion of the reluctance torque, and thus improving the efficiency of the permanent magnet motor. The rotor core provided by the present invention, in the field of higher power motors, takes into account the reluctance torque of the permanent magnet motor. By arranging a magnetic isolation slot group and making the intersection of at least two corresponding magnetic isolation slot trend lines in any group of magnetic isolation slot groups located inside the rotor core, while optimizing noise indicators such as tooth slot torque, a smooth magnetic path is provided for the reluctance torque of the permanent magnet motor, thereby increasing the proportion of the reluctance torque. As a result, the rotor core of the present invention not only has the effect of improving noise indicators, but also improves the efficiency of the permanent magnet motor at the same time, and has a simple structure and is easy to manufacture and produce.

[0011] In addition, the rotor core in the above technical solution provided by the present invention may also have the following additional technical features:

[0012] In the above technical solution, preferably, among at least two magnetic isolation grooves included in any one of the multiple magnetic isolation groove groups, the minimum distance between two adjacent magnetic isolation grooves is d1, and the width of the magnetic isolation groove is d2, satisfying d1>d2.

[0013] In this technical solution, in at least two magnetic isolation slots included in any group of magnetic isolation slots, the minimum distance d1 between two adjacent magnetic isolation slots and the width d2 of the magnetic isolation slots satisfy d1>d2, which further ensures that the magnetic circuit between the magnetic isolation slots is unobstructed, provides a smooth magnetic circuit for the reluctance torque of the permanent magnet motor, increases the proportion of the reluctance torque, and thus improves the efficiency of the permanent magnet motor.

[0014] In any of the above technical solutions, preferably, among the at least two magnetic isolation slots included in any one of the multiple magnetic isolation slot groups, the minimum distance between any one of the magnetic isolation slots and the outer contour of the rotor core is d3, and the minimum distance between it and any one of the multiple permanent magnet slots is d4, satisfying d3<d4.

[0015] In this technical solution, among the at least two magnetic isolation slots included in any group of magnetic isolation slots, the minimum distance d3 between any magnetic isolation slot and the outer contour of the rotor core and the minimum distance d4 between it and any one of the multiple permanent magnet slots satisfy d3<d4, wherein the smaller the minimum distance d3 between any magnetic isolation slot and the outer contour of the rotor core, the more conducive to reducing noise, and the larger the minimum distance d4 between the magnetic isolation slot and any one of the multiple permanent magnet slots, the more effectively it can ensure the smooth flow of the magnetic circuit, thereby improving the efficiency of the permanent magnet motor; when d3<d4 is satisfied, the permanent magnet motor can provide a smooth magnetic circuit for the reluctance torque of the permanent magnet motor while optimizing noise indicators such as the cogging torque, thereby increasing the proportion of the reluctance torque, thereby reducing the noise of the permanent magnet motor and improving the efficiency of the permanent magnet motor.

[0016] In any of the above technical solutions, preferably, the straight line connecting the center of the rotor core and the center of the permanent magnet slot is the d-axis, and the intersection of at least two magnetic isolation slot trend lines corresponding to any group of multiple magnetic isolation slot groups is located on the d-axis.

[0017] In this technical solution, it is preferred to design the intersection of at least two magnetic isolation slot trend lines corresponding to any one of the multiple magnetic isolation slot groups to be located on the d-axis of the rotor core, wherein the d-axis is a straight line connecting the center of the rotor core and the center of the permanent magnet slot, further providing a smooth magnetic path for the reluctance torque of the permanent magnet motor, increasing the proportion of the reluctance torque, reducing the noise of the permanent magnet motor, and improving the efficiency of the permanent magnet motor.

[0018] In any of the above technical solutions, preferably, in a plane perpendicular to the central axis of the rotor core, the outer contour of the rotor core includes: an arc segment, the center of the arc segment coincides with the center of the rotor core, and the arc segment is symmetrical about the d axis; the angle between the two ends of the arc segment and the line connecting its center is a, the number of rotor poles is P, and a≥60° / P is satisfied.

[0019] In this technical solution, in a plane perpendicular to the central axis of the rotor core, the outer contour of the rotor core includes an arc segment whose center coincides with the center of the rotor core, and the arc segment is preferably symmetrical about the d axis. Preferably, the outer contour of the rotor core also includes a connecting segment connected between the two arc segments, and the angle a between the two ends of the arc segment and the line connecting its center and the number of rotor poles P are set to satisfy a≥60° / P; when a≥60° / P is satisfied, specifically, when a takes different values, the outer contour of the rotor core can be a full circle structure or a non-full circle structure, and every two arc segments are connected by a connecting segment. Optionally, the connecting segment is a straight line, a curve or an arc. When the outer contour of the rotor core is a full circle structure, the length of the connecting segment is zero; designing the outer contour of the rotor core as a non-full circle structure can further improve the noise index and optimize the noise reduction effect. In addition, during the assembly process of the rotor core and the stator, the non-full circle outer contour of the rotor core makes assembly simple and convenient, and easy to install, thereby ensuring that the permanent magnet motor using the rotor core of the present invention has excellent manufacturability.

[0020] In any of the above technical solutions, preferably, in a plane perpendicular to the central axis of the rotor core, any one of the multiple permanent magnet slots is V-shaped or W-shaped.

[0021] In this technical solution, the rotor also includes permanent magnets, which are respectively placed in a plurality of permanent magnet slots. In a plane perpendicular to the central axis of the rotor core, any one of the plurality of permanent magnet slots is V-shaped or W-shaped, that is, the magnetic pole structure of the rotor is V-shaped or W-shaped, thereby increasing the area of ​​the permanent magnets in the same space, thereby improving the performance of the motor.

[0022] In any of the above technical solutions, preferably, any one of the at least two magnetic isolation grooves includes one or more sub-magnetic isolation grooves.

[0023] In this technical solution, any one of the at least two magnetic isolation grooves includes one or more sub-magnetic isolation grooves, that is, each magnetic isolation groove can be a sub-magnetic isolation groove, or can be composed of multiple sub-magnetic isolation grooves, both of which can provide a smooth magnetic circuit for the magnetic resistance torque of the permanent magnet motor, increase the proportion of the magnetic resistance torque, reduce the noise of the permanent magnet motor, and improve the efficiency of the permanent magnet motor.

[0024] In any of the above technical solutions, preferably, when any one of the at least two magnetic isolation grooves includes a plurality of sub-magnetic isolation grooves, the plurality of sub-magnetic isolation grooves are spaced apart along the radial direction of the rotor core.

[0025] In this technical solution, when any one of at least two magnetic isolation grooves includes multiple sub-magnetic isolation grooves, the multiple sub-magnetic isolation grooves are spaced apart along the radial direction of the rotor core, which can also provide a smooth magnetic path for the reluctance torque of the permanent magnet motor, increase the proportion of the reluctance torque, reduce the noise of the permanent magnet motor, and improve the efficiency of the permanent magnet motor. Specifically, the magnetic isolation groove trend line formed is the line connecting the first end of the outermost sub-magnetic isolation groove and the second end of the innermost sub-magnetic isolation groove.

[0026] A second aspect of the present invention provides a permanent magnet motor, comprising a rotor core provided by any of the above technical solutions.

[0027] The permanent magnet motor proposed in the present invention includes the rotor core proposed in any of the above technical solutions, and therefore has all the technical effects of the above rotor core, which will not be repeated here.

[0028] In the above technical solution, preferably, the permanent magnet motor also includes: permanent magnets, which are placed in multiple permanent magnet slots; end plates, which are located at both ends of the rotor core in the axial direction to limit the displacement of the permanent magnets in the axial direction; and balancing blocks, which are located at at least one end of the rotor core in the axial direction to adjust the dynamic balance of the rotor core.

[0029] In this technical solution, the permanent magnet motor also includes permanent magnets, end plates and balancing blocks, wherein the permanent magnets are respectively placed in a plurality of permanent magnet slots, the end plates are located at both ends of the rotor core in the axial direction, covers are arranged on the permanent magnet slots to limit the displacement of the permanent magnets in the axial direction and prevent the permanent magnets from escaping from the permanent magnet slots, and the balancing blocks are located at at least one end of the rotor core in the axial direction to adjust the dynamic balance of the rotor core and ensure the stability of the rotor core during rotation. Preferably, balancing blocks are respectively arranged on the end plates at both ends of the rotor core to further improve the rotation stability of the rotor core; specifically, the end plates and the balancing blocks can be assembled with the rotor core by riveting, welding, bolting or other connection methods to ensure the stability of the connection between the various components of the rotor.

[0030] A third aspect of the present invention provides a compressor, comprising a rotor core provided by any one of the above technical solutions or a permanent magnet motor provided by any one of the above technical solutions.

[0031] The compressor proposed in the present invention includes the rotor core or permanent magnet motor proposed in any of the above technical solutions, and therefore has all the technical effects of the above rotor core and motor, which will not be repeated here.

[0032] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0034] Figure 1 A schematic diagram of the rotor core structure according to an embodiment of the present invention is shown;

[0035] Figure 2 A schematic diagram of a partial magnetic circuit of a rotor core according to an embodiment of the present invention is shown;

[0036] Figure 3 A partial structural schematic diagram of a rotor core according to an embodiment of the present invention is shown;

[0037] Figure 4 A schematic structural diagram of a rotor core according to another embodiment of the present invention is shown;

[0038] Figure 5 A schematic structural diagram of a rotor core according to another embodiment of the present invention is shown;

[0039] Figure 6 A schematic structural diagram of a rotor core according to another embodiment of the present invention is shown;

[0040] Figure 7 A schematic structural diagram of a permanent magnet motor according to an embodiment of the present invention is shown;

[0041] Figure 8 Another structural schematic diagram of a permanent magnet motor according to an embodiment of the present invention is shown;

[0042] Fig. 9 A schematic structural diagram of a compressor according to an embodiment of the present invention is shown;

[0043] Fig.10 A schematic diagram comparing the cogging torque of a permanent magnet motor according to an embodiment of the present invention and that of the related art is shown.

[0044] Figures 1 to 9 The corresponding relationship between the reference numerals and the component names is as follows:

[0045] 1 rotor, 10 rotor core, 12 permanent magnet slots, 14 magnetic isolation slot groups, 142 magnetic isolation slots, 144 sub-magnetic isolation slots, 16 magnetic isolation slot trend lines, 18 arc segments, 20 connecting segments, 22 permanent magnets, 24 end plates, 26 balancing blocks, 2 stators, 3 permanent magnet motors, 4 compressors. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0048] Refer to the following Figures 1 to 10 The rotor core, permanent magnet motor and compressor according to some embodiments of the present invention are described.

[0049] like Figure 1 and Figure 2 As shown, an embodiment of the first aspect of the present invention provides a rotor core 10 for a permanent magnet motor 3, wherein the rotor core 10 comprises: a plurality of permanent magnet slots 12, wherein the plurality of permanent magnet slots 12 penetrate the rotor core 10 along the axial direction of the rotor core 10; a plurality of magnetic isolation slot groups 14, wherein the plurality of magnetic isolation slot groups 14 are respectively arranged between any one of the plurality of permanent magnet slots 12 and the outer contour of the rotor core 10, wherein the plurality of magnetic isolation slot groups 14 correspond one-to-one to the plurality of permanent magnet slots 12, and any one of the plurality of magnetic isolation slot groups 14 comprises at least two magnetic isolation slots 142; wherein, in a plane perpendicular to the central axis of the rotor core 10, a straight line connecting the two ends of any one of the at least two magnetic isolation slots 142 is a magnetic isolation slot trend line 16, and the intersection of at least two magnetic isolation slot trend lines 16 corresponding to any one of the plurality of magnetic isolation slot groups 14 is located inside the rotor core 10.

[0050] The rotor core 10 provided by the present invention comprises a plurality of permanent magnet slots 12 and a plurality of magnetic isolation slot groups 14, and the plurality of permanent magnet slots 12 penetrate the rotor core 10 along the axial direction of the rotor core 10, wherein the plurality of magnetic isolation slot groups 14 are respectively arranged between any one of the plurality of permanent magnet slots 12 and the outer contour of the rotor core 10, and the plurality of magnetic isolation slot groups 14 correspond one-to-one to the plurality of permanent magnet slots 12, each magnetic isolation slot group 14 comprises at least two magnetic isolation slots 142, and in a plane perpendicular to the central axis of the rotor core 10, a straight line connecting the two ends of any magnetic isolation slot 142 is set as a magnetic isolation slot Trend line 16, the intersection of at least two magnetic isolation slot trend lines 16 corresponding to any one of the multiple magnetic isolation slot groups 14 is located inside the rotor core 10, and setting up multiple magnetic isolation slot groups 14 can improve the noise indicators such as the tooth torque of the permanent magnet motor 3, thereby reducing the noise of the permanent magnet motor 3 during operation. Furthermore, setting up the intersection of at least two magnetic isolation slot trend lines 16 corresponding to any one of the multiple magnetic isolation slot groups 14 is located inside the rotor core 10, which can provide a smooth magnetic path for the magnetic resistance torque of the permanent magnet motor 3, thereby increasing the proportion of the magnetic resistance torque, and thus improving the efficiency of the permanent magnet motor 3. The rotor core 10 provided by the present invention, in the field of higher power motors, takes into account the reluctance torque of the permanent magnet motor 3. By setting a magnetic isolation slot group 14 and making the intersection of at least two corresponding magnetic isolation slot trend lines 16 in any group of magnetic isolation slot groups 14 located inside the rotor core 10, while optimizing noise indicators such as tooth torque, a smooth magnetic path is provided for the reluctance torque of the permanent magnet motor 3, thereby increasing the proportion of the reluctance torque. As a result, the rotor core 10 of the present invention not only has the effect of improving noise indicators, but also improves the efficiency of the permanent magnet motor 3 at the same time, and has a simple structure and is easy to manufacture and produce.

[0051] Specifically, Figure 2 As shown, Figure 2 This is a schematic diagram of a local magnetic circuit of the rotor core 10 of the first embodiment of the present invention. The armature magnetic field passes through the magnetic circuit of the rotor 1. When the magnetic resistances of the d-axis and the q-axis in the magnetic circuit of the rotor 1 are not equal, a magnetic resistance torque occurs. If the proportion of the magnetic resistance torque is to be increased, it is necessary to ensure that the armature magnetic field path is unobstructed, and the first embodiment of the present invention can provide a smooth magnetic circuit for the magnetic resistance torque of the permanent magnet motor 3, thereby increasing the proportion of the magnetic resistance torque, and thus improving the efficiency of the permanent magnet motor 3.

[0052] Specifically, Fig.10 As shown, Fig.10 This is a schematic diagram comparing the cogging torque of the permanent magnet motor 3 using the rotor core provided by the first aspect of the present invention and the cogging torque of the related art. The related art does not use the magnetic isolation slot 142 structure described in the present invention. Fig.10It can be known that the permanent magnet motor 3 using the rotor core 10 provided by the present invention has a cogging torque improved by about 50% compared with the related art. From a technical principle point of view, the multiple magnetic isolation slots 142 structure provided by the present invention is equivalent to increasing the number of cogging torques, and the amplitude of the cogging torque is inversely proportional to the number. Therefore, the amplitude improvement effect of the cogging torque of the present invention is obvious, thereby effectively reducing the noise of the permanent magnet motor 3. In addition, as mentioned above, the magnetic isolation slots 142 provided by the present invention have the technical effect of improving the magnetic resistance torque, thereby improving the efficiency of the permanent magnet motor 3, so that the technical solution of the present invention not only reduces the noise of the permanent magnet motor 3, but also improves the efficiency of the permanent magnet motor 3.

[0053] Specifically, if Figure 5 As shown, in the rotor core 10 of the present invention, each magnetic isolation slot group 14 includes four magnetic isolation slots 142, wherein the magnetic isolation slot trend lines 16 of two magnetic isolation slots 142 intersect at a point inside the rotor core 10, and the magnetic isolation slot trend lines 16 of the other two magnetic isolation slots 142 are parallel to each other. The scheme in this embodiment can also provide a smooth magnetic path for the reluctance torque of the permanent magnet motor 3 while optimizing noise indicators such as tooth torque, thereby increasing the proportion of reluctance torque, so that the rotor core 10 of the present invention has the technical effect of improving noise indicators and improving the efficiency of the permanent magnet motor 3 at the same time.

[0054] like Figure 3 As shown, in one embodiment of the present invention, preferably, among the at least two magnetic isolation grooves 142 included in any one of the multiple magnetic isolation groove groups 14, the minimum distance between two adjacent magnetic isolation grooves 142 is d1, and the width of the magnetic isolation groove 142 is d2, satisfying d1>d2.

[0055] In this embodiment, in the at least two magnetic isolation slots 142 included in any group of magnetic isolation slot groups 14, the minimum distance d1 between two adjacent magnetic isolation slots 142 and the width d2 of the magnetic isolation slots 142 satisfy d1>d2, which further ensures that the magnetic circuit between the magnetic isolation slots 142 is unobstructed, provides a smooth magnetic circuit for the reluctance torque of the permanent magnet motor 3, increases the proportion of the reluctance torque, and thus improves the efficiency of the permanent magnet motor 3.

[0056] like Figure 3 As shown, in one embodiment of the present invention, preferably, among the at least two magnetic isolation slots 142 included in any one of the multiple magnetic isolation slot groups 14, the minimum distance between any one of the magnetic isolation slots 142 and the outer contour of the rotor core 10 is d3, and the minimum distance between it and any one of the multiple permanent magnet slots 12 is d4, satisfying d3<d4.

[0057] In this embodiment, among the at least two magnetic isolation slots 142 included in any group of magnetic isolation slot groups 14, the minimum distance d3 between any magnetic isolation slot 142 and the outer contour of the rotor core 10 and the minimum distance d4 between it and any one of the multiple permanent magnet slots 12 satisfy d3<d4, wherein the smaller the minimum distance d3 between any magnetic isolation slot 142 and the outer contour of the rotor core 10, the more conducive to reducing noise, and the larger the minimum distance d4 between the magnetic isolation slot 142 and any one of the multiple permanent magnet slots 12, the more effectively it can ensure the smooth flow of the magnetic circuit, thereby improving the efficiency of the permanent magnet motor 3; when d3<d4 is satisfied, the permanent magnet motor 3 can provide a smooth magnetic circuit for the reluctance torque of the permanent magnet motor 3 while optimizing noise indicators such as cogging torque, thereby increasing the proportion of reluctance torque, thereby reducing the noise of the permanent magnet motor 3 and improving the efficiency of the permanent magnet motor 3.

[0058] like Figure 4 As shown, in one embodiment of the present invention, preferably, the straight line connecting the center of the rotor core 10 and the center of the permanent magnet slot 12 is the d-axis, and the intersection of at least two magnetic isolation slot trend lines 16 corresponding to any group of the multiple magnetic isolation slot groups 14 is located on the d-axis.

[0059] In this embodiment, it is preferred to design the intersection of at least two magnetic isolation slot trend lines 16 corresponding to any one of the multiple magnetic isolation slot groups 14 to be located on the d-axis of the rotor core 10, wherein the d-axis is a straight line connecting the center of the rotor core 10 and the center of the permanent magnet slot 12, further providing a smooth magnetic path for the magnetic resistance torque of the permanent magnet motor 3, increasing the proportion of the magnetic resistance torque, reducing the noise of the permanent magnet motor 3, and improving the efficiency of the permanent magnet motor 3.

[0060] like Figure 1 and Figure 4 As shown, in one embodiment of the present invention, preferably, in a plane perpendicular to the central axis of the rotor core 10, the outer contour of the rotor core 10 includes: an arc segment 18, the center of the arc segment 18 coincides with the center of the rotor core 10, and the arc segment 18 is symmetrical about the d axis; the angle between the two ends of the arc segment 18 and the line connecting its center is a, the number of rotor poles is P, and a≥60° / P is satisfied.

[0061] In this embodiment, in a plane perpendicular to the central axis of the rotor core 10, the outer contour of the rotor core 10 includes an arc segment 18 whose center coincides with the center of the rotor core 10, and the arc segment 18 is preferably symmetrical about the d axis. Preferably, the outer contour of the rotor core 10 also includes a connecting segment 20 connected between the two arc segments 18, and the angle a between the two ends of the arc segment 18 and the line connecting the center of the arc segment 18 and the number of rotor poles P is set to satisfy a≥60° / P; when a≥60° / P is satisfied, specifically, when a takes different values, the outer contour of the rotor core 10 can be a full circle structure Or it can be a non-circular structure, and every two arc segments 18 are connected by a connecting segment 20. Optionally, the connecting segment 20 is a straight line, a curve or an arc. When the outer contour of the rotor core 10 is a full-circular structure, the length of the connecting segment 20 is zero. Designing the outer contour of the rotor core 10 as a non-circular structure can further improve the noise index and optimize the noise reduction effect. In addition, during the assembly process of the rotor core 10 and the stator 2, the non-circular outer contour of the rotor core 10 makes the assembly simple and convenient, and easy to install, thereby ensuring that the permanent magnet motor 3 using the rotor core 10 of the present invention has excellent manufacturability.

[0062] like Figures 1 to 6 As shown, in one embodiment of the present invention, preferably, in a plane perpendicular to the central axis of the rotor core 10 , any one of the plurality of permanent magnet slots 12 is V-shaped or W-shaped.

[0063] In this embodiment, the rotor 1 also includes permanent magnets 22, which are respectively placed in a plurality of permanent magnet slots 12. In a plane perpendicular to the central axis of the rotor core 10, any one of the plurality of permanent magnet slots 12 is V-shaped or W-shaped, that is, the magnetic pole structure of the rotor 1 is V-shaped or W-shaped, thereby being able to increase the area of ​​the permanent magnets 22 within the same space, thereby improving the performance of the motor.

[0064] like Figure 1 and Figure 6 As shown, in one embodiment of the present invention, preferably, any one of the at least two magnetic isolation grooves 142 includes one or more sub-magnetic isolation grooves 144 .

[0065] In this embodiment, any one of the at least two magnetic isolation grooves 142 includes one or more sub-magnetic isolation grooves 144, that is, each magnetic isolation groove 142 can be one sub-magnetic isolation groove 144, or can be composed of multiple sub-magnetic isolation grooves 144, both of which can provide a smooth magnetic circuit for the magnetic resistance torque of the permanent magnet motor 3, increase the proportion of the magnetic resistance torque, reduce the noise of the permanent magnet motor 3, and improve the efficiency of the permanent magnet motor 3. Technical effect.

[0066] like Figure 6As shown, in one embodiment of the present invention, preferably, when any one of the at least two magnetic isolation slots 142 includes a plurality of sub-magnetic isolation slots 144 , the plurality of sub-magnetic isolation slots 144 are spaced apart in the radial direction of the rotor core 10 .

[0067] In this embodiment, when any one of the at least two magnetic isolation grooves 142 includes a plurality of sub-magnetic isolation grooves 144, the plurality of sub-magnetic isolation grooves 144 are spaced apart along the radial direction of the rotor core 10, which can also provide a smooth magnetic path for the magnetic resistance torque of the permanent magnet motor 3, thereby increasing the proportion of the magnetic resistance torque, reducing the noise of the permanent magnet motor 3, and improving the efficiency of the permanent magnet motor 3. Specifically, the magnetic isolation groove trend line 16 formed thereby is a line connecting the first end of the outermost sub-magnetic isolation groove 144 and the second end of the innermost sub-magnetic isolation groove 144.

[0068] like Figure 7 and Figure 8 As shown, the second aspect of the present invention proposes a permanent magnet motor 3, comprising the rotor core 10 proposed in any of the above embodiments.

[0069] The permanent magnet motor 3 proposed in the present invention includes the rotor core 10 proposed in any of the above embodiments, and therefore has all the technical effects of the above rotor core 10, which will not be described in detail here.

[0070] like Figure 7 and Figure 8 As shown, in one embodiment of the present invention, preferably, the permanent magnet motor 3 also includes: a permanent magnet 22, which is placed in a plurality of permanent magnet slots 12; an end plate 24, which is located at both ends of the rotor core 10 in the axial direction to limit the displacement of the permanent magnet 22 in the axial direction; and a balancing block 26, which is located at at least one end of the rotor core 10 in the axial direction to adjust the dynamic balance of the rotor core 10.

[0071] In this embodiment, the permanent magnet motor 3 also includes a permanent magnet 22, an end plate 24 and a balancing block 26, wherein the permanent magnets 22 are respectively placed in a plurality of permanent magnet slots 12, the end plates 24 are located at both ends of the rotor core 10 in the axial direction, and a cover is provided on the permanent magnet slot 12 to limit the displacement of the permanent magnet 22 in the axial direction to prevent the permanent magnet 22 from escaping from the permanent magnet slot 12, and the balancing block 26 is located at at least one end of the rotor core 10 in the axial direction to adjust the dynamic balance of the rotor core 10 to ensure the stability of the rotor core 10 during rotation. Preferably, balancing blocks 26 are respectively provided on the end plates 24 at both ends of the rotor core 10 to further improve the rotation stability of the rotor core 10; specifically, the end plates 24 and the balancing blocks 26 can be assembled with the rotor core 10 by riveting, welding, bolting or other connection methods to ensure the stability of the connection between the various components of the rotor 1.

[0072] like Fig. 9 As shown, the third aspect of the present invention proposes a compressor 4, comprising the rotor core 10 proposed in any one of the above embodiments or the permanent magnet motor 3 proposed in any one of the above embodiments.

[0073] The compressor 4 proposed in the present invention includes the rotor core 10 or the permanent magnet motor 3 proposed in any of the above embodiments, and therefore has all the technical effects of the above rotor core 10 and the motor, which will not be repeated here.

[0074] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0075] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor core for a permanent magnet motor, characterized in that: The rotor core comprises: A plurality of permanent magnet slots, wherein the plurality of permanent magnet slots penetrate the rotor core along the axial direction of the rotor core; A plurality of magnetic isolation slot groups, wherein the plurality of magnetic isolation slot groups are respectively arranged between any one of the plurality of permanent magnet slots and the outer contour of the rotor core, the plurality of magnetic isolation slot groups correspond to the plurality of permanent magnet slots one by one, and any one of the plurality of magnetic isolation slot groups includes at least two magnetic isolation slots; Wherein, in a plane perpendicular to the central axis of the rotor core, a straight line connecting two ends of any one of the at least two magnetic isolation slots is a magnetic isolation slot trend line, and an intersection point of at least two magnetic isolation slot trend lines corresponding to any one of the plurality of magnetic isolation slot groups is located inside the rotor core; Any one of the at least two magnetic isolation grooves comprises a plurality of sub-magnetic isolation grooves; When any one of the at least two magnetic isolation grooves includes a plurality of sub-magnetic isolation grooves, the plurality of sub-magnetic isolation grooves are arranged at intervals along the radial direction of the rotor core, and the magnetic isolation groove trend line is a line connecting the first end of the outermost sub-magnetic isolation groove and the second end of the innermost sub-magnetic isolation groove; A straight line connecting the center of the rotor core and the center of the permanent magnet slot is the d-axis; In a plane perpendicular to the central axis of the rotor core, the outer contour of the rotor core includes: An arc segment, the center of which coincides with the center of the rotor core, and the arc segment is symmetrical about the d-axis; The angle between the two ends of the arc segment and the center of the arc segment is a, the number of rotor poles is P, and a≥60° / P is satisfied; The outer contour of the rotor core includes a connecting segment connected between the two arc segments, and the connecting segment includes a straight line segment, a curve segment and an arc segment.

2. The rotor core according to claim 1, characterized in that: Among the at least two magnetic isolation grooves included in any one of the plurality of magnetic isolation groove groups, the minimum distance between two adjacent magnetic isolation grooves is d1, and the width of the magnetic isolation groove is d2, satisfying d1>d2.

3. The rotor core according to claim 1, characterized in that: Among the at least two magnetic isolation slots included in any one of the multiple magnetic isolation slot groups, the minimum distance between any one of the magnetic isolation slots and the outer contour of the rotor core is d3, and the minimum distance between it and any one of the multiple permanent magnet slots is d4, satisfying d3<d4.

4. The rotor core according to any one of claims 1 to 3, characterized in that: The intersection point of at least two magnetic isolation groove trend lines corresponding to any one of the plurality of magnetic isolation groove groups is located on the d-axis.

5. The rotor core according to any one of claims 1 to 3, characterized in that: In a plane perpendicular to the central axis of the rotor core, any one of the plurality of permanent magnet slots is V-shaped or W-shaped.

6. A permanent magnet motor, characterized in that: include: A rotor core according to any one of claims 1 to 5.

7. The permanent magnet motor according to claim 6, characterized in that: The permanent magnet motor also includes: A permanent magnet, wherein the permanent magnet is placed in the plurality of permanent magnet slots; End plates, the end plates are located at both ends of the rotor core in the axial direction to limit the displacement of the permanent magnet in the axial direction; A balancing block is located at at least one end of the rotor core in the axial direction to adjust the dynamic balance of the rotor core.

8. A compressor, characterized in that: include: The rotor core according to any one of claims 1 to 5; or A permanent magnet motor as claimed in claim 6 or 7.

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