Motor assembly, compressor and refrigeration equipment

Abstract

The utility model discloses a motor assembly, a compressor and refrigeration equipment, the motor assembly comprises a rotor iron core and a plurality of magnetic steel groups, the rotor iron core comprises a plurality of rotor punching sheets which are laminated along the direction of a rotation axis, the rotor punching sheets are provided with a plurality of magnetic steel grooves, and the plurality of magnetic steel grooves are arranged at intervals along the circumferential direction of the rotor iron core; the plurality of magnetic steel groups are correspondingly mounted in the plurality of magnetic steel grooves, each magnetic steel group comprises a plurality of magnetic steel bodies, and the plurality of magnetic steel bodies are sequentially arranged in the circumferential direction; wherein in each magnetic steel group, in any two adjacent magnetic steel bodies, the intrinsic coercive force of the magnetic steel body far away from the d axis is greater than the intrinsic coercive force of the magnetic steel body close to the d axis. The motor assembly provided by the utility model effectively improves demagnetization and can reduce cost.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, and in particular to a motor component, a compressor and a refrigeration device. Background Art

[0002] The motor assembly is the core component of the compressor, and the efficiency of the motor assembly directly affects the overall performance of the compressor. In the related art, the motor assembly adopts a few-slot pole matching structure to improve efficiency. However, the few-slot pole matching structure will bring about the problems of poor anti-demagnetization ability and insufficient overload capacity, especially the anti-demagnetization ability near the q-axis position is poor. For this reason, the magnetic load is increased by increasing the thickness of the magnetic steel, thereby improving the demagnetization and overload capacity. However, the use of thicker magnetic steel will lead to increased costs. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a motor component, which effectively improves demagnetization and reduces costs.

[0004] The utility model also provides a compressor having the motor assembly and a refrigeration device having the compressor.

[0005] According to the first aspect of the utility model, the motor component includes a rotor core, including a plurality of rotor punchings stacked along the direction of the rotation axis, the rotor punchings are provided with a plurality of magnetic steel slots, and the plurality of magnetic steel slots are arranged at intervals along the circumferential direction of the rotor core; a plurality of magnetic steel groups are correspondingly installed in the plurality of magnetic steel slots, the magnetic steel groups include a plurality of magnetic steel bodies, and the plurality of magnetic steel bodies are arranged in sequence along the circumferential direction; wherein, in each of the magnetic steel groups, among any two adjacent magnetic steel bodies, the intrinsic coercive force of the magnetic steel body away from the d-axis is greater than the intrinsic coercive force of the magnetic steel body close to the d-axis.

[0006] The motor assembly according to the embodiment of the first aspect of the utility model has at least the following beneficial effects: the intrinsic coercive force of the magnetic steel body far away from the d-axis in any two adjacent magnetic steel bodies in each magnetic steel group is greater than the intrinsic coercive force of the magnetic steel body close to the d-axis, that is, the closer to the q-axis, the greater the intrinsic coercive force of the magnetic steel body and the better the anti-demagnetization ability, thereby improving the anti-demagnetization ability of the magnetic steel group, achieving the purpose of improving demagnetization and optimizing the magnetic field distribution; at the same time, there is no need to increase the thickness of the magnetic steel body, which is conducive to reducing material costs and thus reducing the manufacturing cost of the motor assembly.

[0007] According to some embodiments of the present invention, among two adjacent magnetic steel bodies, the distance from one end of one magnetic steel body close to the other magnetic steel body to the end away from the other magnetic steel body is the width of the magnetic steel body, and within each magnetic steel group, among any two adjacent magnetic steel bodies, the width of the magnetic steel body away from the d-axis is greater than the width of the magnetic steel body close to the d-axis.

[0008] According to some embodiments of the present invention, along the d-axis direction, the magnetic steel slot has a first wall surface and a second wall surface that are arranged opposite to each other, and the rotor punching includes a connecting rib, and both ends of the connecting rib are respectively connected to the first wall surface and the second wall surface.

[0009] According to some embodiments of the present invention, the number of the connecting ribs is equal to the number of the magnetic steel slots, the connecting ribs are arranged in the magnetic steel slots in a one-to-one correspondence, and the central axis of the connecting ribs coincides with the d-axis.

[0010] According to some embodiments of the present invention, a plurality of the connecting ribs are arranged in each of the magnetic steel slots, and the plurality of the connecting ribs in each of the magnetic steel slots are arranged at intervals along the circumferential direction and symmetrically about the d-axis.

[0011] According to some embodiments of the utility model, along the circumferential direction, the connecting rib has a third wall and a fourth wall facing away from each other, and the minimum distance between the third wall and the fourth wall is L1. The magnetic steel body has a fifth wall and a sixth wall facing away from each other, the fifth wall faces the first wall, and the sixth wall faces the second wall, and the minimum distance between the fifth wall and the sixth wall is L2, satisfying: 3≤L2 / L1≤6.

[0012] According to some embodiments of the utility model, the rotor punching is provided with a plurality of magnetic isolation groups, and the plurality of magnetic isolation groups are respectively and one by one arranged between the plurality of magnetic steel slots and the outer contour of the rotor punching, each of the magnetic isolation groups includes a plurality of magnetic isolation grooves, and the plurality of magnetic isolation grooves are arranged at intervals along the circumferential direction.

[0013] According to some embodiments of the present invention, in each magnetic isolation group, a plurality of magnetic isolation grooves are symmetrically arranged about the d-axis.

[0014] According to some embodiments of the present invention, an end of the magnetic isolation groove close to the magnetic steel groove is a first end, an end of the magnetic isolation groove away from the magnetic steel groove is a second end, and the second end is closer to the d-axis than the first end.

[0015] According to some embodiments of the utility model, the magnetic steel slot includes a first slot segment and a second slot segment symmetrically arranged about the d-axis, and the angle between the first slot segment and the second slot segment toward the d-axis direction is β. In each of the magnetic isolation groups, along the circumferential direction, the line connecting the first ends of the multiple magnetic isolation slots located on one side of the d-axis is the first line, and the line connecting the first ends of the multiple magnetic isolation slots located on the other side of the d-axis is the second line. The angle between the first line and the second line toward the d-axis direction is γ, satisfying: 90°<γ<β.

[0016] According to some embodiments of the present invention, the direction from the second end to the first end is the extension direction of the magnetic isolation groove, two of the magnetic isolation grooves of the magnetic isolation group are the first magnetic isolation groove and the second magnetic isolation groove, the first magnetic isolation groove and the second magnetic isolation groove are respectively located on both sides of the d-axis along the circumferential direction, and along the circumferential direction, the first magnetic isolation groove and the second magnetic isolation groove are respectively closer to the two q-axes adjacent to the d-axis, and the angle between the extension direction of the first magnetic isolation groove and the extension direction of the second magnetic isolation groove is α, satisfying: 90°<α≤120°.

[0017] According to some embodiments of the present invention, the maximum outer diameter of the rotor core is D1, and the number of rotor pole pairs of the motor assembly is P, which satisfies: 8≤D1 / P≤16.

[0018] According to some embodiments of the present invention, the motor assembly also includes a stator core, which is wound around the outer circumference of the rotor core, the maximum outer diameter of the stator core is D2, and the minimum inner diameter of the stator core is D3, satisfying: 0.52<D3 / D2<0.7.

[0019] The compressor according to the embodiment of the second aspect of the utility model comprises the motor assembly of the embodiment of the first aspect of the utility model.

[0020] The compressor according to the embodiment of the second aspect of the utility model has at least the following beneficial effects: since the compressor adopts the above-mentioned motor assembly, the intrinsic coercive force of the magnetic steel body far away from the d-axis in any two adjacent magnetic steel bodies in each magnetic steel group is greater than the intrinsic coercive force of the magnetic steel body close to the d-axis, that is, the closer to the q-axis, the greater the intrinsic coercive force of the magnetic steel body, and the better the anti-demagnetization ability, thereby improving the anti-demagnetization ability of the magnetic steel group, achieving the purpose of improving demagnetization and optimizing the magnetic field distribution; at the same time, there is no need to increase the thickness of the magnetic steel body, which is conducive to reducing material costs and thus reducing the manufacturing cost of the motor assembly.

[0021] The refrigeration device according to the embodiment of the third aspect of the utility model comprises the compressor of the embodiment of the second aspect of the utility model.

[0022] The refrigeration equipment according to the embodiment of the third aspect of the utility model has at least the following beneficial effects: since the refrigeration equipment adopts the above-mentioned compressor, the intrinsic coercive force of the magnetic steel body far away from the d-axis in any two adjacent magnetic steel bodies in each magnetic steel group is greater than the intrinsic coercive force of the magnetic steel body close to the d-axis, that is, the closer to the q-axis, the greater the intrinsic coercive force of the magnetic steel body, and the better the anti-demagnetization ability, thereby improving the anti-demagnetization ability of the magnetic steel group, achieving the purpose of improving demagnetization and optimizing the magnetic field distribution; at the same time, there is no need to increase the thickness of the magnetic steel body, which is conducive to reducing material costs and thus reducing the manufacturing cost of the motor assembly.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 is a schematic diagram of a motor assembly in an embodiment of the utility model;

[0026] Figure 2 yes Figure 1 Schematic diagram of the stator core;

[0027] Figure 3 It is a schematic diagram of the combination of the magnetic steel group and the rotor core in the embodiment of the utility model;

[0028] Figure 4 It is a schematic diagram of the structure of the rotor punching in the embodiment of the utility model;

[0029] Figure 5 It is a schematic diagram of the structure of the rotor punching in another embodiment of the utility model;

[0030] Figure 6 It is a structural schematic diagram of the magnetic steel body in the embodiment of the utility model;

[0031] Figure 7 It is a simulation diagram of the magnetic induction intensity of the magnetic steel group in the embodiment of the utility model;

[0032] Figure 8 It is a simulation diagram of the magnetic induction intensity of a magnetic steel group in the prior art.

[0033] Reference numerals:

[0034] Rotor core 10; stator core 20;

[0035] Rotor punching 100; magnetic steel slot 110; first slot section 111; second slot section 112; first wall surface 113; second wall surface 114; connecting rib 120; third wall surface 121; fourth wall surface 122; first magnetic isolation slot 130; first end 131; second end 132; second magnetic isolation slot 140; first connecting line 150; second connecting line 160;

[0036] Magnetic steel group 200 ; magnetic steel body 210 ; fifth wall surface 211 ; sixth wall surface 212 . DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installing, connecting, assembling, and matching should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model based on the specific content of the technical solution.

[0041] The motor assembly is the core component of the compressor, and the efficiency of the motor assembly directly affects the overall performance of the compressor. In the related art, the motor assembly adopts a few-slot-pole matching structure to improve efficiency. However, the few-slot-pole matching structure will bring about the problems of poor anti-demagnetization ability and insufficient overload capacity.

[0042] Reference Figure 8As shown in the figure, it is a schematic diagram of the magnetic induction intensity of various parts of the magnetic steel of the rotor in a certain state in the prior art, wherein the darker the color, the greater the magnetic induction intensity, and vice versa, the lighter the color, the smaller the magnetic induction intensity. During the operation of the motor assembly, due to the effect of the demagnetization magnetic field of the armature winding, the magnetic field direction of the demagnetization magnetic field is parallel to and opposite to the magnetic field direction of the magnetic field generated by the magnetic steel (i.e., the permanent magnetic field), which will cause the magnetic induction intensity of the magnetic steel to decrease, especially the magnetic induction intensity of the magnetic steel close to the q-axis is smaller. Figure 8 In the state of the rotor, the magnetic induction intensity of the magnets at the upper left and lower right corners (both are close to the q-axis) in the figure is smaller than that of the magnets near the d-axis, while the magnetic induction intensity of the magnets at the lower left and upper right corners in the figure is basically the same as that of the magnets near the d-axis. It is easy to understand that, since the rotor is rotating, in another state, the magnetic induction intensity of the magnets at the lower left and upper right corners (both are close to the q-axis) in the figure is smaller than that of the magnets near the d-axis, while the magnetic induction intensity of the magnets at the upper left and lower right corners in the figure is basically the same as that of the magnets near the d-axis. In other words, the magnetic induction intensity near the d-axis is smaller than that near the d-axis, that is, the anti-demagnetization ability of the magnets near the q-axis is smaller than that of the magnets near the d-axis, and the anti-demagnetization ability is poor, resulting in uneven magnetic field distribution and affecting the overload capacity.

[0043] It is easy to understand that the d-axis is the magnetic field direction of the magnetic pole (i.e., the NS direction), and the electrical angle θ between the q-axis and the d-axis is 电 The mechanical angle θ between the q-axis and the d-axis is 90°. 机 is the angle between the q-axis and the d-axis on the projection plane perpendicular to the rotor's rotation axis. The mechanical angle is the spatial geometric angle, θ 电 and θ 机 Satisfy: θ 电 =Pθ 机 , where P is the number of pole pairs of the rotor. That is to say, on the projection plane perpendicular to the rotation axis of the rotor, the d-axis can be understood as the symmetric center line of the magnetic pole, and the q-axis can be understood as the symmetric center line of two adjacent magnetic poles.

[0044] In order to solve the problem of poor anti-demagnetization ability, in the related art, the magnetic load is increased by increasing the thickness of the magnetic steel near the q-axis position, thereby improving the demagnetization and overload capabilities. However, using thicker magnetic steel will increase the cost.

[0045] For this purpose, refer to Figures 1 to 6 As shown, the first embodiment of the utility model provides a motor assembly, which is applied to a compressor. The compressor is applied to a refrigeration device, and the refrigeration device can be an air conditioner, a refrigerator, etc.

[0046] Reference Figure 1 As shown, it can be understood that the motor assembly includes a stator and a rotor, wherein the stator includes a stator core 20 and a winding (not shown) wound on the stator teeth of the stator core 20, and the rotor includes a rotor core 10 and a plurality of magnetic steel groups 200, and the plurality of magnetic steel groups 200 are installed on the rotor core 10. The stator core 20 is wound around the outer periphery of the rotor core 10, and the rotor core 10 can rotate inside the stator core 20.

[0047] Reference Figure 4 As shown, it can be understood that the rotor core 10 includes a plurality of rotor punchings 100, and the plurality of rotor punchings 100 are stacked along the axial direction of the rotor core 10, and the axial direction of the rotor core 10 is the direction of the rotation axis of the shaft core. Each rotor punching 100 is provided with a plurality of magnetic steel slots 110, and the plurality of magnetic steel slots 110 are arranged at equal intervals along the circumference of the rotor core 10, and the magnetic steel slots 110 penetrate the rotor punching 100, and the circumference of the rotor core 10 is the direction around the rotation axis of the rotor core 10. After the plurality of rotor punchings 100 are stacked, the magnetic steel slots 110 at the same position along the circumference of the rotor core 10 on each rotor punching 100 are correspondingly connected. On the projection plane perpendicular to the axial direction of the rotor core 10, the shape of the magnetic steel slot 110 can be V-shaped, W-shaped, U-shaped or straight-shaped, etc. In this embodiment, each rotor punching sheet 100 is provided with four magnetic steel slots 110 . The shape of the magnetic steel slots 110 is V-shaped, and the magnetic steel slots 110 are an axisymmetric structure.

[0048] It is easy to understand that the d-axis can be understood as the symmetric center line of the magnetic steel slot 110 , and the q-axis can be understood as the symmetric center line of two adjacent magnetic steel slots 110 .

[0049] Reference Figure 3 and Figure 4As shown, it can be understood that the number of magnetic steel groups 200 is equal to the number of magnetic steel slots 110 on each rotor punching 100, and multiple magnetic steel groups 200 are correspondingly installed in multiple magnetic steel slots 110. Each magnetic steel group 200 includes multiple magnetic steel bodies 210, and multiple magnetic steel bodies 210 are sequentially arranged in the magnetic steel slots 110 along the circumference of the rotor core 10. Specifically, in this embodiment, the shape of the magnetic steel slot 110 is V-shaped. In order to make the shape of all magnetic steel bodies 210 consistent for easy processing, in each magnetic steel group 200, multiple magnetic steel bodies 210 are evenly divided into two groups and are respectively located on both sides of the d-axis along the circumference of the rotor core 10, and the magnetic steel bodies 210 of the two groups are symmetrically arranged about the d-axis. Generally speaking, the number of magnetic steel bodies 210 in each magnetic steel group 200 is an even number, and the number of magnetic steel bodies 210 located on one side of the d-axis is at least two, that is, each magnetic steel group 200 includes at least four magnetic steel bodies 210. Therefore, there are at least two magnetic steel bodies 210 between adjacent d-axes and q-axes. In this embodiment, each magnetic steel group 200 includes four magnetic steel bodies 210. Of course, each magnetic steel sub-group may include six, eight, ten or more magnetic steel bodies 210. Correspondingly, the number of magnetic steel bodies 210 located between adjacent d-axes and q-axes is three, four, five or more.

[0050] It can be understood that in other embodiments, for example, the magnetic steel slot 110 is in a straight line shape, and the number of magnetic steel bodies 210 in each magnetic steel group 200 can be an odd number or an even number, wherein, when there is an even number, the arrangement of the magnetic steel bodies 210 can refer to the above description. When there is an odd number, there are at least three, and along the circumference of the rotor core 10, the magnetic steel bodies 210 located in the middle position are arranged symmetrically about the d axis, and the remaining magnetic steel bodies 210 are divided into two groups and symmetrically arranged on both sides of the d axis along the circumference of the rotor core 10.

[0051] Reference Figure 3 As shown, it can be understood that, in each magnetic steel group 200, among any two adjacent magnetic steel bodies 210, the intrinsic coercive force of the magnetic steel body 210 far from the d-axis is greater than the intrinsic coercive force of the magnetic steel body 210 close to the d-axis. In other words, among the multiple magnetic steel bodies 210 between the adjacent d-axis and q-axis, the intrinsic coercive forces of the multiple magnetic steel bodies 210 decrease in sequence from the q-axis to the adjacent d-axis.

[0052] It is easy to understand that the intrinsic coercive force of the magnetic steel body 210 is related to the percentage of the permanent magnet material or components of the magnetic steel body 210. For two magnetic steel bodies 210 with different intrinsic coercive forces, different permanent magnet materials may be used. For example, the magnetic steel body 210 may be an oxide magnet or a rare earth magnet of neodymium iron boron, wherein the intrinsic coercive force of the rare earth magnet of neodymium iron boron is greater than the intrinsic coercive force of the oxide magnet.

[0053] It is easy to understand that the intrinsic coercive force is a physical quantity that measures the anti-demagnetization ability of the magnetic steel body 210. The greater the intrinsic coercive force, the better the anti-demagnetization ability of the magnetic steel body 210, and vice versa. The intrinsic coercive force can be measured by a digital fluxmeter magnet tester and other equipment. For the magnetic steel body 210 in the motor assembly, when actually measuring the intrinsic coercive force of the magnetic steel body 210, the magnetic steel body 210 can be disassembled and then measured by the above equipment.

[0054] Therefore, by making the intrinsic coercive force of the magnetic steel body 210 far away from the d-axis in any two adjacent magnetic steel bodies 210 in each magnetic steel group 200 greater than the intrinsic coercive force of the magnetic steel body 210 close to the d-axis, that is, the closer to the q-axis, the greater the intrinsic coercive force of the magnetic steel body 210, and the better the anti-demagnetization ability, thereby improving the anti-demagnetization ability of the magnetic steel group 200, achieving the purpose of improving demagnetization and optimizing the magnetic field distribution; at the same time, there is no need to increase the thickness of the magnetic steel body 210, which is conducive to reducing material costs and thus reducing the manufacturing cost of the motor component.

[0055] Reference Figure 7 , which is a schematic diagram of the magnetic induction intensity of various locations of the magnetic steel body 210 of the rotor in a certain state of this embodiment. Figure 7 It can be seen that the magnetic induction intensity at each location of each magnetic steel body 210 is substantially equal and relatively large, so that demagnetization can be significantly improved, the magnetic field distribution can be optimized, and the magnetic field distribution can be uniform, which is beneficial to improving the overload capacity of the motor assembly.

[0056] Reference Figure 3 and Figure 6 As shown, it can be understood that, of the two adjacent magnetic steel bodies 210, one is defined as the first magnetic steel body 210 and the other is defined as the second magnetic steel body 210, and the distance from one end of the first magnetic steel body 210 close to the second magnetic steel body 210 to one end away from the second magnetic steel body 210 is the width of the first magnetic steel body 210, and the direction in which the width dimension is located is the width direction. Generally speaking, on the projection plane perpendicular to the axial direction of the rotor core 10, the projection of the magnetic steel body 210 is a rectangle, and the length of the long side of the rectangular projection of the magnetic steel body 210 is the width of the magnetic steel body 210. Therefore, when measuring the width of the magnetic steel body 210, the long side of the projection of the magnetic steel body 210 on the projection plane perpendicular to the axial direction of the rotor core 10 can be directly measured. Alternatively, along the width direction, the straight-line distance between the two ends of the magnetic steel body 210 is the width, and the width of the magnetic steel body 210 can be measured by directly clamping the two ends of the magnetic steel body 210 along the width direction with a vernier caliper. Of course, the projection of the magnetic steel body 210 may also be other shapes.

[0057] Reference Figure 3 and Figure 6As shown, it can be understood that, in each magnetic steel group 200, among any two adjacent magnetic steel bodies 210, the width of the magnetic steel body 210 away from the d-axis is greater than the width of the magnetic steel body 210 close to the d-axis. That is to say, among the multiple magnetic steel bodies 210 between the adjacent d-axis and the q-axis, the widths of the multiple magnetic steel bodies 210 decrease in sequence from the q-axis to the adjacent d-axis. Therefore, the width of the magnetic steel body 210 close to the q-axis is made larger, that is, the width of the magnetic steel body 210 with a larger intrinsic coercive force is also larger, and the magnetic steel body 210 with a larger intrinsic coercive force corresponds to a larger magnetic field range, so that the anti-demagnetization ability of the magnetic steel group 200 can be further improved, demagnetization can be further improved, and the magnetic field distribution can be optimized to further improve the overload capacity of the motor component.

[0058] Reference Figure 4 As shown, it can be understood that, along the d-axis direction, the magnetic steel slot 110 has a first wall surface 113 and a second wall surface 114 arranged oppositely. In this embodiment, on the projection surface perpendicular to the axial direction of the rotor core 10, the first wall surface 113 and the second wall surface 114 are both V-shaped. Of the two walls arranged oppositely along the d-axis direction in the magnetic steel slot 110, the wall surface close to the rotation axis of the rotor core 10 is defined as the first wall surface 113, and the wall surface away from the rotation axis of the rotor core 10 is defined as the second wall surface 114.

[0059] Reference Figure 4 As shown, it can be understood that the rotor punching 100 also includes a connecting rib 120, and the two ends of the connecting rib 120 along the d-axis are respectively connected to the first wall 113 and the second wall 114. On the projection plane perpendicular to the axial direction of the rotor core 10, the projection of the connecting rib 120 is a rectangle. Of course, the projection of the connecting rib 120 can also be other shapes. Specifically, in this embodiment, in each rotor punching 100, the number of connecting ribs 120 is equal to the number of magnetic steel slots 110, and the connecting ribs 120 are arranged in the magnetic steel slots 110 in a one-to-one correspondence. In each magnetic steel slot 110, the connecting rib 120 is arranged along the d-axis and the central axis of the connecting rib 120 coincides with the d-axis. The connecting rib 120 divides the magnetic steel slot 110 into two straight slot segments, and the two slot segments are symmetrically arranged about the d-axis, and at least two magnetic steel bodies 210 are respectively arranged in each slot segment.

[0060] Reference Figure 5As shown, it can be understood that, in other embodiments, each magnetic steel slot 110 may correspond to a plurality of connecting ribs 120, that is, a plurality of connecting ribs 120 are arranged in each magnetic steel slot 110. Taking one of the magnetic steel slots 110 as an example for explanation, for example, two connecting ribs 120 are arranged in the magnetic steel slot 110, and the two connecting ribs 120 are respectively located on both sides of the d-axis along the circumference of the rotor core 10, and the two connecting ribs 120 are symmetrically arranged about the d-axis, and the two connecting ribs 120 are both perpendicular to the first wall surface 113 (and also perpendicular to the second wall surface 114), and the two connecting ribs 120 divide the magnetic steel slot 110 into three slot segments arranged in sequence along the circumference of the rotor core 10.

[0061] Alternatively, in other embodiments, three connecting ribs 120 may be arranged in the magnetic steel slot 110, one of which is arranged along the d-axis and located at the d-axis, and the other two connecting ribs 120 are respectively located on both sides of the d-axis along the circumferential direction of the rotor core 10 and are arranged symmetrically about the d-axis, so that the three connecting ribs 120 divide the magnetic steel slot 110 into four linear slot segments. Of course, four, five or more connecting ribs 120 may also be arranged in each magnetic steel slot 110, which will not be repeated here.

[0062] Therefore, by providing a connecting rib 120 between the first wall 113 and the second wall 114, on the one hand, a connecting structure can be added between the partial structure located on the rotor punching 100 where the magnetic steel slot 110 is close to the rotation axis of the rotor core 10 and the partial structure located between the magnetic steel slot 110 and the outer peripheral wall of the rotor core 10, so as to improve the structural stability of the rotor punching 100; on the other hand, the passage of the demagnetization magnetic field can be increased, that is, part of the magnetic flux of the demagnetization magnetic field passes through the connecting rib 120, thereby reducing the magnetic flux of the demagnetization magnetic field passing through the magnetic steel body 210, thereby reducing the magnetic field pressure of the demagnetization magnetic field borne by the magnetic steel body 210 and improving the stability of the permanent magnetic field.

[0063] Reference Figure 4 As shown, it can be understood that along the circumference of the rotor core 10, the connecting rib 120 has a third wall 121 and a fourth wall 122 that are opposite to each other, and the minimum distance between the third wall 121 and the fourth wall 122 is defined as L1. Generally speaking, the third wall 121 is parallel to the fourth wall 122, so the distance between the third wall 121 and the fourth wall 122 is also the minimum distance. When measuring L1, the two caliper feet of the vernier caliper are directly clamped on the third wall 121 and the fourth wall 122, and the length direction of the main scale of the vernier caliper is ensured to be perpendicular to the third wall 121 or the fourth wall 122, and the reading is the value of L1. It is easy to understand that L1 can be understood as the minimum width of the connecting rib 120.

[0064] Reference Figure 6As shown, it can be understood that the magnetic steel body 210 has a fifth wall 211 and a sixth wall 212 that are opposite to each other, the fifth wall 211 faces one of the first wall 113 and the second wall 114, and the sixth wall 212 faces the other. The fifth wall 211 is defined as the wall facing the first wall 113, and the sixth wall 212 is defined as the wall facing the second wall 114. The minimum distance between the fifth wall 211 and the sixth wall 212 is L2. Generally speaking, the fifth wall 211 and the sixth wall 212 are parallel, and the fifth wall 211 and the sixth wall 212 are both parallel to the width direction of the magnetic steel body 210. The distance between the fifth wall 211 and the sixth wall 212 is also the minimum distance L2. L2 can also be understood as the minimum thickness of the magnetic steel body 210, and the direction where the thickness dimension is located is the thickness direction. When measuring L2, the two caliper feet of the vernier caliper are directly clamped on the fifth wall 211 and the sixth wall 212, and the length direction of the main scale of the vernier caliper is ensured to be perpendicular to the fifth wall 211 or the sixth wall 212, and the reading is the value of L2.

[0065] It can be understood that, generally speaking, the magnetic steel body 210 can be installed exactly between the first wall 113 and the second wall 114, that is, the fifth wall 211 is in contact with the first wall 113, and the sixth wall 212 is in contact with the second wall 114, that is, the distance between the first wall 113 and the second wall 114 is basically equal to L2.

[0066] Reference Figure 3 , Figure 4 and Figure 6 As shown, it can be understood that the minimum width L1 of the connecting rib 120 and the minimum thickness L2 of the magnetic steel body 210 satisfy: 3≤L2 / L1≤6, that is, the ratio of the minimum thickness of the magnetic steel body 210 to the minimum width of the connecting rib 120 is 3 to 6 (including 3 and 6). For example, the value of L2 / L1 is 3, 4, 4.5, 5, 5.5 or 6. If the value of L2 / L1 is too small, it will lead to a too small minimum thickness of the magnetic steel body 210, a small magnetic load, poor anti-demagnetization ability, insufficient overload capacity, and affect the performance of the motor assembly; if the value of L2 / L1 is too large, the connecting rib 120 is a long and narrow structure. On the one hand, the structural strength of the connecting rib 120 is low, which affects the structural stability of the rotor punching 100. On the other hand, the path of the demagnetization magnetic field is narrow, which is not conducive to reducing the magnetic field pressure of the demagnetization magnetic field borne by the magnetic steel body 210. Therefore, limiting L2 / L1 within a reasonable range can not only ensure the anti-demagnetization capability of the magnetic steel body 210 to ensure the overload capacity of the motor assembly, but also reduce the magnetic field pressure of the demagnetization magnetic field borne by the magnetic steel body 210.

[0067] Reference Figure 4As shown, it can be understood that the rotor punching 100 is provided with a plurality of magnetic isolation groups, the number of the magnetic isolation groups is equal to the number of the magnetic steel slots 110, and each magnetic isolation group is correspondingly arranged between each magnetic steel slot 110 and the outer contour of the rotor punching 100, that is, the magnetic isolation group is located on the side of the magnetic steel slot 110 away from the rotation axis of the rotor core 10.

[0068] Taking one of the magnetic isolation groups as an example, the structure of the magnetic isolation group is described in detail in combination with the corresponding magnetic steel slot 110.

[0069] Reference Figure 4 As shown, it can be understood that the magnetic isolation group includes a plurality of magnetic isolation grooves, which are elongated structures and extend from the magnetic steel slots 110 to the outer contour of the rotor punching 100 , and the plurality of magnetic isolation grooves are arranged at intervals along the circumference of the rotor core 10 .

[0070] Reference Figure 4 As shown, it can be understood that in this embodiment, each magnetic isolation group includes six magnetic isolation slots, and the six magnetic isolation slots are divided into two groups and are respectively arranged on both sides of the d-axis along the circumference of the rotor core 10, and the magnetic isolation slots of the two groups are symmetrically arranged about the d-axis. The end of the magnetic isolation slot close to the magnetic steel slot 110 is defined as the first end 131, and the end of the magnetic isolation slot away from the magnetic steel slot 110 is defined as the second end 132. The direction from the second end 132 to the first end 131 is the extension direction Z of the magnetic isolation slot. In any magnetic isolation slot, the second end 132 is closer to the d-axis than the first end 131. By limiting the extension direction of the magnetic isolation slot to be inclined relative to the d-axis, and the magnetic isolation group as a whole is symmetrical about the d-axis, the distribution of the demagnetization magnetic field can be adjusted, thereby effectively suppressing the armature reaction, weakening the harmonics, and thereby improving the overload capacity of the motor assembly. At the same time, the demagnetization magnetic field is evenly distributed, which reduces torque pulsation and is conducive to reducing noise.

[0071] Reference Figure 4 As shown, it can be understood that the magnetic steel slot 110 includes a first slot segment 111 and a second slot segment 112, both of which are linear, and the first slot segment 111 and the second slot segment 112 are symmetrically arranged about the d-axis, and the angle between the first slot segment 111 and the second slot segment 112 toward the d-axis direction is defined as β, and the angle β can be understood as the opening angle of the magnetic steel group 200. When measuring β, the V-shaped angle formed by the projection of the second wall surface 114 can be measured on the projection surface perpendicular to the axial direction of the rotor core 10, that is, the angle of β.

[0072] Reference Figure 4As shown, it can be understood that, in the magnetic isolation group, the line connecting the first ends 131 of the multiple magnetic isolation slots located on one side of the d-axis along the circumference of the rotor core 10 is defined as the first line 150, and the line connecting the first ends 131 of the multiple magnetic isolation slots located on the other side of the d-axis along the circumference of the rotor core 10 is defined as the second line 160, and the angle between the first line 150 and the second line 160 toward the d-axis direction is γ.

[0073] Reference Figure 4 As shown, it can be understood that the angle β and the angle γ satisfy: 90°<γ<β. On the one hand, the distribution of the demagnetization magnetic field can be further improved. On the other hand, the suppression effect on the armature reaction can be further improved, harmonics can be weakened, and the overload capacity can be improved.

[0074] Reference Figure 4 As shown, it can be understood that two of the magnetic isolation grooves in the magnetic isolation group are the first magnetic isolation groove 130 and the second magnetic isolation groove 140, and the first magnetic isolation groove 130 and the second magnetic isolation groove 140 are respectively located on both sides of the d-axis along the circumference of the rotor core 10, and along the circumference of the rotor core 10, the first magnetic isolation groove 130 and the second magnetic isolation groove 140 are closer to the two q-axes adjacent to the d-axis than other magnetic isolation grooves in the magnetic isolation group, that is, the first magnetic isolation groove 130 and the second magnetic isolation groove 140 are the two outermost magnetic isolation grooves in the magnetic isolation group along the circumference of the rotor core 10. The angle between the extension directions of the first magnetic isolation groove 130 and the second magnetic isolation groove 140 is defined as α, which satisfies: 90°<α≤120°. When measuring α, the angle between the wall surface of the first magnetic isolation groove 130 facing the d-axis and the wall surface of the second magnetic isolation groove 140 facing the d-axis can be measured, which is the angle of α. In other words, limiting the angle range between the two outermost magnetic isolation slots can further improve the distribution of the demagnetization magnetic field, thereby improving the waveform of the air gap magnetic field, effectively suppressing the armature reaction, further weakening the harmonics, and helping to improve the overload capacity of the motor assembly.

[0075] Reference Figure 4As shown, it can be understood that the maximum outer diameter of the rotor core 10 is defined as D1. When measuring D1, the distance between the two ends of the outer contour of the rotor core 10 that are farthest apart can be directly measured by a vernier caliper along the radial direction of the rotor core 10. The number of rotor pole pairs of the motor assembly is P. In this embodiment, P=2. The maximum outer diameter D1 of the rotor core 10 and the number of rotor pole pairs P satisfy: 8≤D1 / P≤16, that is, the ratio of the maximum outer diameter of the rotor core 10 to the number of rotor pole pairs is limited to 8 to 16 (including 8 and 16). For example, the value of D1 / P can be 8, 9, 10, 11, 12, 13, 14, 15, 16, etc. When D1 / P is too small, the size of each magnetic steel slot 110 along the circumference of the rotor core 10 is too small, and it is more difficult to replace an integral magnetic steel in the magnetic steel slot 110 with a plurality of magnetic steel bodies 210 arranged in sequence along the circumference of the rotor core 10, that is, the segmented degree of freedom of the magnetic steel is small, which is not conducive to improving the anti-demagnetization ability of the magnetic steel group 200. When D1 / P is too large, the number of rotor pole pairs is too small, and the few-slot pole structure has the problems of poor anti-demagnetization ability and insufficient overload capacity. Therefore, limiting the ratio of the maximum outer diameter of the rotor core 10 to the number of rotor pole pairs within a reasonable range can improve the anti-demagnetization ability of the magnetic steel group 200, achieve the purpose of improving demagnetization, and optimize the magnetic field distribution.

[0076] Reference Figure 2 As shown, it can be understood that the maximum outer diameter of the stator core 20 is defined as D2, and the minimum inner diameter of the stator core 20 is defined as D3, which satisfies: 0.52<D3 / D2<0.7, that is, the ratio of the minimum inner diameter to the maximum outer diameter of the stator core 20 is greater than 0.52 and less than 0.7. The value of D3 / D2 can be 0.55, 0.6, 0.65, 0.68, etc. When D3 / D2>0.52, the minimum inner diameter of the stator core can be increased, that is, the outer diameter of the rotor core 10 is increased, and the size of the magnetic steel slot 110 along the circumference of the rotor core 10 can be increased, that is, more installation space is provided for the magnetic steel group 200, which is more conducive to segmenting the magnetic steel, with a large degree of freedom in segmentation, and easier to install, thereby improving the manufacturability of the rotor. When D3 / D2<0.7, the width of the stator core 20 along the radial direction can be guaranteed, the stiffness of the stator core 20 can be guaranteed, the stator core mode can be improved, and the noise can be reduced. Therefore, by making 0.52<D3 / D2<0.7, the manufacturability of the rotor can be improved while ensuring the rigidity of the stator core 20, and the anti-demagnetization ability of the magnetic steel group 200 can be improved, thereby achieving the purpose of improving demagnetization.

[0077] The compressor of the second embodiment of the utility model includes the motor assembly of the first embodiment of the utility model.

[0078] Since the compressor adopts all the technical solutions of the motor assembly of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0079] The refrigeration device of the embodiment of the third aspect of the utility model comprises the compressor of the embodiment of the second aspect of the utility model, and the refrigeration device may be an air conditioner, a refrigerator, etc.

[0080] Since the refrigeration equipment adopts all the technical solutions of the compressor of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0081] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A motor assembly, characterized in that: include: The rotor core comprises a plurality of rotor punchings stacked and arranged along the direction of the rotation axis, wherein the rotor punchings are provided with a plurality of magnetic steel slots, and the plurality of magnetic steel slots are arranged at intervals along the circumferential direction of the rotor core; A plurality of magnetic steel groups are correspondingly installed in the plurality of magnetic steel slots, the magnetic steel groups include a plurality of magnetic steel bodies, and the plurality of magnetic steel bodies are sequentially arranged along the circumferential direction; Among them, in each of the magnetic steel groups, among any two adjacent magnetic steel bodies, the intrinsic coercive force of the magnetic steel body far away from the d-axis is greater than the intrinsic coercive force of the magnetic steel body close to the d-axis.

2. The motor assembly according to claim 1, characterized in that: Among two adjacent magnetic steel bodies, the distance from one end of one magnetic steel body close to the other magnetic steel body to the end away from the other magnetic steel body is the width of the magnetic steel body. In each magnetic steel group, among any two adjacent magnetic steel bodies, the width of the magnetic steel body away from the d-axis is greater than the width of the magnetic steel body close to the d-axis.

3. The motor assembly according to claim 1, characterized in that: Along the d-axis direction, the magnetic steel slot has a first wall surface and a second wall surface that are arranged opposite to each other, and the rotor punching sheet includes a connecting rib, and two ends of the connecting rib are respectively connected to the first wall surface and the second wall surface.

4. The motor assembly according to claim 3, characterized in that: The number of the connecting ribs is equal to the number of the magnetic steel slots, the connecting ribs are arranged in the magnetic steel slots in a one-to-one correspondence, and the central axis of the connecting ribs coincides with the d-axis.

5. The motor assembly according to claim 3, characterized in that: A plurality of the connecting ribs are arranged in each of the magnetic steel slots, and the plurality of the connecting ribs in each of the magnetic steel slots are arranged at intervals along the circumferential direction and symmetrically about the d-axis.

6. The motor assembly according to any one of claims 3 to 5, characterized in that: Along the circumferential direction, the connecting rib has a third wall and a fourth wall facing away from each other, and the minimum distance between the third wall and the fourth wall is L1. The magnetic steel body has a fifth wall and a sixth wall facing away from each other, the fifth wall faces the first wall, and the sixth wall faces the second wall. The minimum distance between the fifth wall and the sixth wall is L2, satisfying: 3≤L2 / L1≤6.

7. The motor assembly according to claim 1, characterized in that: The rotor punching sheet is provided with a plurality of magnetic isolation groups, and the plurality of magnetic isolation groups are respectively and one by one arranged between the plurality of magnetic steel slots and the outer contour of the rotor punching sheet, and each of the magnetic isolation groups includes a plurality of magnetic isolation grooves, and the plurality of magnetic isolation grooves are arranged at intervals along the circumferential direction.

8. The motor assembly according to claim 7, characterized in that: In each of the magnetic isolation groups, a plurality of magnetic isolation grooves are symmetrically arranged about the d-axis.

9. The motor assembly according to claim 7 or 8, characterized in that: One end of the magnetic isolation groove close to the magnetic steel groove is a first end, and one end of the magnetic isolation groove away from the magnetic steel groove is a second end. The second end is closer to the d-axis than the first end.

10. The motor assembly according to claim 9, characterized in that: The magnetic steel slot includes a first slot segment and a second slot segment symmetrically arranged about the d-axis, and an angle between the first slot segment and the second slot segment toward the d-axis direction is β. In each of the magnetic isolation groups, along the circumferential direction, a line connecting the first ends of a plurality of the magnetic isolation slots located on one side of the d-axis is a first line, and a line connecting the first ends of a plurality of the magnetic isolation slots located on the other side of the d-axis is a second line. An angle between the first line and the second line toward the d-axis direction is γ, satisfying: 90°<γ<β.

11. The motor assembly according to claim 9, characterized in that: The direction from the second end to the first end is the extension direction of the magnetic isolation groove, two of the magnetic isolation grooves of the magnetic isolation group are the first magnetic isolation groove and the second magnetic isolation groove, the first magnetic isolation groove and the second magnetic isolation groove are respectively located on both sides of the d-axis along the circumferential direction, and along the circumferential direction, the first magnetic isolation groove and the second magnetic isolation groove are respectively closer to the two q-axes adjacent to the d-axis, the angle between the extension direction of the first magnetic isolation groove and the extension direction of the second magnetic isolation groove is α, satisfying: 90°<α≤120°.

12. The motor assembly according to claim 1, characterized in that: The maximum outer diameter of the rotor core is D1, and the number of rotor pole pairs of the motor assembly is P, which satisfies: 8≤D1 / P≤16.

13. The motor assembly according to claim 1, characterized in that: The motor assembly further includes a stator core, which is wound around the outer circumference of the rotor core. The maximum outer diameter of the stator core is D2, and the minimum inner diameter of the stator core is D3, satisfying: 0.52<D3 / D2<0.

7.

14. A compressor, characterized in that Comprising a motor assembly as claimed in any one of claims 1 to 13.

15. Refrigeration equipment, characterized in that Comprising the compressor of claim 14.

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