Rotor, motor, compressor and refrigeration equipment
By setting the magnetic steel channel to the radial inclination of the rotor punch in a permanent magnet motor and adopting a parallelogram-like magnetic steel shape, the problem of low effective magnetic flux density in the plug-in rotor magnetic steel structure is solved, and the motor is significantly improved or the output power and torque density of the compressor.
Patent Information
- Application Number
- CN202421066932.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-15
AI Technical Summary
The plug-in rotor magnetic steel structure of the permanent magnet motor results in low effective flux density and insufficient output power, making it difficult to meet user needs.
By setting the magnetic steel groove radially inclined relative to the rotor punch, and adapting the shape of the magnet to the size of the magnetic steel groove, increasing the magnetic flux area, a parallelogram cross-sectional shape is adopted to improve the flux density .
It effectively improves the magnetic flux area and output power of the rotor, and improves the torque density and output power of the motor or compressor.
Smart Images
Figure CN222301502U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, and in particular to a magnetic steel, a rotor core, a motor, a compressor and a refrigeration device. Background Art
[0002] At present, the magnet fixing methods of the permanent magnet motor rotor are divided into surface mounting type and insertion type. The magnet of the insertion type rotor of the permanent magnet motor is usually a rectangular structure. After the magnet is inserted into the magnet slot in the rotor core, the magnet is circumferentially distributed around the center of the rotor core. However, the effective magnetic flux density between the rotor and the stator of this magnet structure is low, resulting in a low output power of the motor or compressor equipped with a magnet insertion rotor, which is difficult to meet user needs. Utility Model Content
[0003] The main purpose of the utility model is to provide a rotor, by installing the magnetic steel with a radial tilt relative to the rotor core, the effective magnetic flux area and density provided by the magnetic steel are increased, thereby improving the output power of the motor or compressor.
[0004] In order to achieve the above-mentioned object, the rotor proposed by the utility model comprises:
[0005] A rotor core, wherein the rotor core is formed by stacking a plurality of rotor punchings, wherein the rotor punchings are provided with a plurality of circumferentially distributed magnetic steel slots, wherein the extension direction of the magnetic steel slots is inclined relative to the radial direction of the rotor punchings; and
[0006] A plurality of magnetic steels are adapted and installed in the plurality of magnetic steel slots one by one, and the cross section of the magnetic steel is parallelogram-like, including a rectangular area in the middle and triangular areas located at opposite ends of the rectangular area, and the triangular areas and the rectangular areas are distributed along the length direction of the cross section of the magnetic steel.
[0007] Optionally, the distance between the midpoints of the two short sides of the magnetic steel cross section is defined as H, the width of the rectangular area is defined as W, the length of the rectangular area is defined as H3, and the distances from the intersection of the two side edges of the triangular area to the rectangular area are defined as H2 and H1 respectively, and W, H, H3, H2 and H1 satisfy: (H / W)<H3 / (H1+H2).
[0008] Optionally, the relative corner size of the two triangular areas is defined as J1, and J1, W, H, H3, H2 and H1 also satisfy: H / (H1+H2+H3)<sinJ1<(H / W)<H3 / (H1+H2).
[0009] Optionally, the area of the rectangular area is defined as C, and the areas of the two triangular areas are defined as A and B respectively, and A, B, C, H1, H2 and H3 satisfy: H3 / (H1+H2)<C / (A+B).
[0010] Optionally, A and B satisfy: 1≤A / B≤1.1, and the triangular area corresponding to A is arranged close to the outer periphery of the rotor punching sheet.
[0011] Optionally, H2 and H1 satisfy: 1≤H1 / H2≤1.15, and the triangular area corresponding to H1 is arranged close to the outer periphery of the rotor punching.
[0012] Optionally, the cross section of the magnetic steel is configured as a parallelogram, and the corners of the magnetic steel are configured as arc surfaces.
[0013] Optionally, the magnetic steel is made of ferrite material or neodymium iron boron material.
[0014] Optionally, the angle between the radial direction of the rotor punching sheet and the center line of the magnetic steel slot in the extension direction is defined as J2, and J2 satisfies: 10°≤J2≤40°.
[0015] Optionally, at least a portion of the side walls of the magnetic steel slots are provided with spring plates, and the spring plates have a portion extending into the magnetic steel slots and pressing against the magnetic steel.
[0016] Optionally, the rotor punching includes an inner ring portion and a plurality of fan-shaped portions distributed circumferentially around the inner ring portion, two adjacent fan-shaped portions and the inner ring portion enclose the magnetic steel slot, and the spring sheet is arranged on the outer wall of the inner ring portion and extends radially along the rotor punching.
[0017] Optionally, an avoidance zone is formed between at least part of the magnetic steel slots and the inner ring portion, and the avoidance zone on one of the rotor punchings corresponds to a spring sheet of the axially adjacent rotor punching, and in the installation direction of the magnetic steel, a plurality of the avoidance zones are located on the same side of the axially adjacent spring sheets along the rotor core.
[0018] Optionally, the number of rotor poles of the rotor structure is defined as p, and the radial angle between the avoidance areas and the spring sheets adjacent to each other on the same rotor punching sheet satisfies: 360° / p or 360° / (p / 2).
[0019] Optionally, the magnetic steel slot is provided with at least two elastic sheets extending in proportion to each other, and the lengths of the elastic sheets in the same magnetic steel slot have a difference.
[0020] Optionally, the rotor also includes end plates arranged at both ends of the rotor core, the thickness of the end plates is defined as W3, the thickness of the rotor punching sheets is defined as T, the spacing between the midpoints of the two short sides of the magnetic steel cross section is defined as H, the width of the rectangular area is defined as W, and T, W3, H and W satisfy: 3×T≤W3≤H / W.
[0021] Optionally, the rotor core is formed by stacking and fastening a plurality of rotor punching sheets.
[0022] Optionally, the rotor punching includes a plurality of first rotor punchings and a second rotor punching sandwiched between the first rotor punchings and the end plate, the outer periphery of the second rotor punchings is continuously arranged, and the magnetic steel slots of the first rotor punchings are arranged through the outer periphery.
[0023] Optionally, the rotor further includes rivets, which extend along the axial direction of the rotor core, and the end plate and the rotor punching sheet are fixed by riveting.
[0024] Optionally, the gap between the magnetic steel and the corresponding magnetic steel slot is W2, and W2 satisfies: 0.05mm≤W2≤0.15mm.
[0025] Optionally, two sections of the magnetic steel are installed in the same magnetic steel slot, and the two magnetic steels are installed facing each other from two axial ends of the magnetic steel slot.
[0026] Optionally, the number of slot poles of the stator is defined as m, and the number of magnetic steel slots of the rotor punching sheet is defined as m±2×k, where k is 1 or 2.
[0027] The utility model also provides a motor, which comprises a stator and the rotor as described above.
[0028] The utility model also provides a compressor, which comprises the motor as described above.
[0029] The utility model also provides a refrigeration device, which comprises the compressor as mentioned above.
[0030] The technical solution of the utility model is to set the magnetic steel slot at an inclination relative to the radial direction of the rotor punching and extend it from the inner periphery to the outer periphery of the rotor punching. At the same time, the shape of the magnetic steel is adapted to the size of the magnetic steel slot, and then the magnetic steel is adapted and installed in the magnetic steel slot. In this way, multiple magnetic steels are placed at an inclination relative to the radial direction of the rotor punching and distributed along the circumference of the rotor punching to increase the magnetic flux area. Combined with the parallelogram-like cross-sectional shape of the magnetic steel, the triangular area can ensure the anti-demagnetization ability of the magnetic steel corresponding to the rectangular area, and then effectively ensure the magnetic flux area of the rectangular area, thereby increasing the magnetic flux area of the rotor, so as to effectively improve the air gap magnetic density at the outer periphery of the rotor, so that the motor or compressor has higher torque density and output power. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0032] Figure 1 This is an exploded schematic diagram of an embodiment of a rotor of the utility model;
[0033] Figure 2 for Figure 1 Schematic diagram of the structure of the middle rotor punching plate;
[0034] Figure 3 for Figure 2 A partial enlarged view of the middle A;
[0035] Figure 4 for Figure 1 Schematic diagram of the structure of Zhongmagnetic Steel;
[0036] Figure 5 for Figure 1 Schematic diagram of the explosion of two adjacent rotor punchings
[0037] Figure 6 for Figure 1 A schematic diagram of the structure of the second rotor punching sheet;
[0038] Figure 7 The figure is a comparison diagram of the torque of the motor of the utility model and the torque of the existing rectangular magnetic steel motor.
[0039] Description of Figure Numbers:
[0040] Label name Label name 100 Rotor punching 110 Magnetic steel slot 120 shrapnel 130 Avoidance hole 140 Bridge 150 Deduction points 160 Inner ring 170 Sector 200 magnetic steel 300 End Plate 310 rivet hole 400 rivet
[0041] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0043] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0045] The utility model provides a rotor.
[0046] In the embodiment of the present utility model, please refer to Figures 1 to 4 , Figure 7 , the rotor comprises:
[0047] A rotor core, wherein the rotor core is formed by stacking a plurality of rotor punchings 100, wherein the rotor punchings 100 are provided with a plurality of circumferentially distributed magnetic steel slots 110, wherein the extension direction of the magnetic steel slots 110 is inclined relative to the radial direction of the rotor punchings 100; and
[0048] Multiple magnetic steels 200 are adapted and installed in multiple magnetic steel slots 110 one by one. The cross section of the magnetic steel 200 is parallelogram-like, including a rectangular area in the middle and triangular areas located at opposite ends of the rectangular area. The triangular area and the rectangular area are distributed along the length direction of the cross section of the magnetic steel 200.
[0049] The technical solution of the utility model is to set the magnetic steel slot 110 to be inclined relative to the radial direction of the rotor punching 100, and extend it from the inner periphery to the outer periphery of the rotor punching 100. At the same time, the shape of the magnetic steel 200 is adapted to the size of the magnetic steel slot 110, and then the magnetic steel 200 is adapted and installed in the magnetic steel slot 110. In this way, multiple magnetic steels 200 are placed to be inclined relative to the radial direction of the rotor punching 100, and are distributed along the circumference of the rotor punching 100 to increase the magnetic flux area. Combined with the parallelogram-like cross-sectional shape of the magnetic steel 200, the triangular area can ensure the anti-demagnetization ability of the magnetic steel 200 corresponding to the rectangular area, and then effectively ensure the magnetic flux area of the rectangular area, thereby increasing the magnetic flux area of the rotor, so as to effectively increase the air gap magnetic density at the outer periphery of the rotor, so that the motor or compressor has a higher torque density and output power.
[0050] It should be noted that the extension direction of the magnetic steel slot 110 is between the radial direction and the circumferential direction of the rotor punching 100, and the two long sides in the extension direction are arranged in parallel, which is manifested as: from the center of the rotor punching 100 to its outer periphery, the circumferential spacing between two adjacent magnetic steel slots 110 gradually increases. In addition, the cross section of the magnetic steel 200 is perpendicular to the axial direction of the magnetic steel 200 and is arranged in parallel with the plane where the rotor punching 100 is located. The corner of the magnetic steel 200 can be a cone angle or an arc angle. In particular, in this embodiment, the corner of the magnetic steel 200 is an arc angle, which reduces the leakage magnetic flux of the magnetic steel 200 and ensures the magnetic flux density between the rotor and the stator. Correspondingly, at the arc corner position of the cross section of the magnetic steel 200, the corners of the rectangular area and the triangular area are set as arc lines.
[0051] In one embodiment, please refer to Figure 4, the distance between the midpoints of the two short sides of the cross section of the magnetic steel 200 is defined as H, the width of the rectangular area is defined as W, the length of the rectangular area is defined as H3, and the distances from the intersection of the two sides of the triangular area to the rectangular area are defined as H2 and H1 respectively. W, H, H3, H2 and H1 satisfy: (H / W)<H3 / (H1+H2). It should be noted that the area of the rectangular area under the arc corner is: the area of the square rectangle formed by the intersection of the two long sides extending in the opposite direction and the adjacent short sides corresponding to the front of the extension, and then the area reduced by setting the arc corner is subtracted, and finally reflected as the area of the rectangular area. In this case, H3 is represented by the length of the long side of the above-mentioned square rectangle, that is, the distance between the above two intersections in the direction of the long side extension. The short side of the cross section of the magnetic steel 200 is the side at both ends of its length, not a specific side. It can be understood that one side of the triangular area is integrated with the rectangular area. The two sides of the triangular area referred to in this article are the physical sides of the cross section of the magnetic steel 200 at both ends of its length. Similarly, the area of the triangular area under the conical corner is: the area of the square triangle formed by the intersection of the two sides of the triangular area and the edge of the rectangular area, and then the area reduced by setting the arc angle is subtracted to finally reflect the area of the triangular area. In this case, H1 and H2 represent the distance from the corner of the square triangle away from the rectangular area to the rectangular area. In addition, the midpoint of the short side is represented by: in the long side direction, the position of H1 / 2 or H2 / 2 is the intersection of a side of the short side, and the two intersections along the long side direction are the size of H. In this way, by limiting (H / W)<H3 / (H1+H2), the area of the rectangular zone in the middle is made to account for a larger proportion, thereby ensuring the effective magnetic flux area of the magnet 200. At the same time, the triangular zone can ensure the anti-demagnetization ability of the magnet 200 corresponding to the rectangular zone, thereby making the motor or compressor have a higher torque density and output power.
[0052] It can be understood that under the above definition, (H / W)<H3 / (H1+H2) can better control the area of the triangular area, so that the inclination of its side relative to the rectangular area is within a reasonable range, ensuring that the effective area of the magnetic flux of the magnetic steel 200, that is, the area of the rectangular area, is maximized, thereby increasing the magnetic flux area of the rotor, so as to effectively increase the air gap magnetic density of the outer periphery of the rotor, so as to increase the output power of the motor or compressor. Figure 7 As shown, in the prior art, a rectangular magnetic steel 200 is provided, and the rectangular magnetic steel 200 extends radially along the rotor punching 100. The output torque of the prior art rectangular magnetic steel 200 is 228.4 mNm, and the output torque of the utility model is 240.1 mNm ( Figure 7 As shown), it can be seen that under the same speed comparison, the utility model can better improve the output power of the motor.
[0053] In one embodiment, please refer to Figures 2 to 4, define the relative angle size of the two triangular areas as J1, J1, W, H, H3, H2 and H1 also satisfy: H / (H1+H2+H3)<sinJ1<(H / W)<H3 / (H1+H2). It can be understood that by limiting sinJ1<(H / W), the inclination of the side of the triangular area relative to the rectangular area is reduced to reduce the area of the triangular area. At the same time, by limiting H / (H1+H2+H3)<sinJ1, the length of the rectangular area is increased. In this way, through the limitation of the above formula, while increasing the magnetic flux area of the rectangular area to increase the effective magnetic flux area of the magnetic steel 200, the area of the triangular area is reasonably reduced, thereby increasing the proportion of the area of the rectangular area to the cross-sectional area of the magnetic steel 200, so as to maximize the output power of the motor or compressor.
[0054] In one embodiment, please refer to Figures 2 to 4 , define the area of the rectangular area as C, define the areas of the two triangular areas as A and B respectively, and A, B, C, H1, H2 and H3 satisfy: H3 / (H1+H2)<C / (A+B). By making the area ratio of the rectangular area and the triangular area greater than the width ratio in the long side direction, the parallelogram-like cross section of the magnetic steel 200 is ensured to be in a relatively square and regular state, but different from the rectangular structure, that is, for the parallelogram, the above formula is limited to minimize the difference between the two internal angles at the same end, and effectively improve the magnetic flux density of the rotor when the magnetic steel 200 is at a reasonable inclination relative to the rotor punching 100.
[0055] In one embodiment, please continue to refer to Figures 2 to 4 , A and B satisfy: 1≤A / B≤1.1, and the triangular area corresponding to A is set close to the outer periphery of the rotor sheet 100. It should be noted that the magnetic response of the part of the magnetic steel 200 close to the outer periphery of the rotor sheet 100 is more sensitive, that is, the anti-demagnetization ability of this part is required to be better. In this way, the area of the triangular area close to the outer periphery of the rotor sheet 100 of the two triangular areas is slightly larger than the area of the triangular area close to the inner periphery of the rotor sheet 100, so as to better ensure the anti-demagnetization ability in the rectangular area, so as to improve the stability of the position of the magnetic steel 200 corresponding to the rectangular area as the radiation area of the effective magnetic flux part. At the same time, by limiting 1≤A / B≤1.1, it can ensure that the proportion of the rectangular area to the entire cross section is large, so as to improve the anti-demagnetization ability of the magnetic steel 200 while also ensuring the output power of the motor, and then ensuring the operation reliability of the motor. Without loss of generality, the corners of the two triangular areas relative to the rectangular area are J1 and J3, respectively. In this embodiment, J1 is less than or equal to J3, or the chamfer arc of the triangular area corresponding to B is large, so that 1≤A / B≤1.1. Of course, in other embodiments, A / B may also be between 0.8-0.9 or 1.1-1.2.
[0056] Similarly, in one embodiment, please refer to Figures 2 to 4 , H2 and H1 satisfy: 1≤H1 / H2≤1.15, and the triangular area corresponding to H1 is arranged close to the outer periphery of the rotor sheet 100. Referring to the above description, H1 / H2 means that the area of the triangular area close to the outer periphery of the rotor sheet 100 is slightly larger than the area of the triangular area close to the inner periphery of the rotor sheet 100, thereby better ensuring the anti-demagnetization ability within the rectangular area, so as to improve the stability of the position of the rectangular area corresponding to the magnetic steel 200 as the radiation area of the effective magnetic flux part. At the same time, the limitation of 1≤H1 / H2≤1.15 can ensure that the rectangular area occupies a large proportion of the entire cross-section, thereby improving the anti-demagnetization ability of the magnetic steel 200 while also ensuring the output power of the motor, and further ensuring the operating reliability of the motor. Without loss of generality, such as Figure 4 As shown, the corners of the two triangular areas relative to the rectangular area are J1 and J3, respectively. In this embodiment, J1 is less than or equal to J3, so that 1≤H1 / H2. Of course, in other embodiments, H1 / H2 can also be between 0.8-0.9 or 1.15 to 1.2.
[0057] In one embodiment, please refer to Figures 2 to 4 , the cross section of the magnetic steel 200 is configured as a parallelogram, and the corners of the magnetic steel 200 are set as cambered surfaces. It can be understood that the magnetic steel 200 with cambered surfaces at the corners can avoid magnetic leakage and ensure the magnetic flux density of the magnetic steel 200 radiating toward the rotor. At the same time, the corners of the magnetic steel 200 are chamfered to avoid collision and damage to the magnetic steel 200, and to ensure the convenience and stability of the use of the magnetic steel 200. In addition, the cross section of the magnetic steel 200 is configured as a parallelogram, which not only ensures the convenience of forming the magnetic steel 200, but also improves the convenience of operation of the magnetic steel 200 installed in the inclined magnetic steel slot 110. Specifically, one side of the triangular area is connected to the long side of the rectangular area and is in the same straight line, and J1 and J3 are equal in size and are represented as two acute angles in the inner angle of the parallelogram. Of course, in other embodiments, the two sides of the triangles on both sides may also be at an angle with the long side of the rectangular area, and the corners of the magnetic steel 200 may also be configured as a tapered angle.
[0058] In one embodiment, please refer to Figures 2 to 4 The material of the magnetic steel 200 is ferrite or NdFeB. It should be noted that NdFeB permanent magnets can radiate good magnetic flux to improve the air gap magnetic density. At the same time, NdFeB permanent magnets have strong machinability and can be processed to fit various shapes. Ferrite permanent magnets have a lower cost, which can reduce the production cost of motors or compressors.
[0059] In one embodiment, please refer to Figures 2 to 6, define the radial direction of the rotor punching sheet 100 and the center line angle of the magnetic steel slot 110 in the extension direction as J2, and J2 satisfies: 10°≤J2≤40°. In this way, it can be ensured that the difference in the core thickness between two adjacent magnetic steel slots 110 at the inner and outer peripheries of the rotor punching sheet 100 is small, and the magnetic flux density radiated by the magnetic steel 200 is ensured. At the same time, the effective magnetic flux area of the magnetic steel 200 can also be ensured, and the two adjacent magnetic steels 200 are prevented from being magnetically isolated from each other and reducing the air gap magnetic density. In this way, the radial direction of the rotor punching sheet 100 and the center line angle of the magnetic steel slot 110 in the extension direction are limited to between 10° and 40°, which effectively increases the magnetic flux area while also ensuring the output power of the rotor. Specifically, the intersection of the magnetic steel slot 110 and the outer periphery of the rotor punching 100 is the corner position of the angle J2, one side of the corner is parallel to the extension direction of the magnetic steel slot 110, that is, the direction of the extension center of the magnetic steel slot 110, and the other side is the radius direction of the location, thereby enclosing the angle J2. Of course, in other embodiments, J2 can also be between 40° and 50°, or J2 is 5° to 10°.
[0060] In one embodiment, please refer to Figure 2 , Figure 5 and Figure 6 , at least part of the groove side wall of the magnetic steel groove 110 is provided with a spring piece 120, and the spring piece 120 has a portion extending into the magnetic steel groove 110 and pressing against the magnetic steel 200. It should be noted that the spring piece 120 is located on one side of the groove side wall of the magnetic steel groove 110, and can be directly set on the groove side wall, or can be set in other grooves connected to the groove side wall. It can be understood that the spring piece 120 is provided in the magnetic steel groove 110, and part of the spring piece 120 is extended into the magnetic steel groove 110 to press against the magnetic steel 200, so that the elastic force of the spring piece 120 presses the magnetic steel 200 in the magnetic steel groove 110, and the corner of the magnetic steel 200 is chamfered, which can guide the spring piece 120 to undergo elastic deformation when installing the magnetic steel 200, thereby ensuring the convenience of installation of the magnetic steel 200 and the stability of the magnetic steel 200 in the magnetic steel groove 110. Compared with the existing gluing or injection molding methods, the present embodiment uses the spring sheet 120 to press against the magnetic steel 200, thereby reducing the material used to fix the magnetic steel 200. At the same time, based on the good stability of the magnetic steel 200, the maintenance frequency is reduced, thereby reducing the overall cost. Of course, in other embodiments, the magnetic steel 200 can also be fixed in the magnetic steel slot 110 by gluing or injection molding.
[0061] Specifically, in this embodiment, please refer to Figure 2 and Figure 3The rotor punching sheet includes an inner ring portion 160 and a plurality of sector portions 170 circumferentially distributed around the inner ring portion 160. Two adjacent sector portions 170 and the inner ring portion 160 enclose a magnetic steel slot 110. The spring piece 120 is arranged on the outer wall of the inner ring portion 160 and extends radially along the rotor punching sheet 110. The sector portion 170 is spaced apart from the outer peripheral wall of the inner ring portion 160 and can be connected to the outer wall of the inner ring portion 160 through a connecting bridge. The inner ring portion 160 is sleeved on the rotating shaft to ensure the magnetic flux strength between the magnetic steel 200 and the stator, and to improve the anti-demagnetization ability of the magnetic steel 200 close to the inner ring portion 160. In this embodiment, a plurality of fan-shaped portions 170 are alternately connected to the inner ring portion 160 in the circumferential direction, and the fan-shaped portions 170 connected to the inner ring portion 160 and the fan-shaped portions 170 not connected to the inner ring portion 160 are independently connected to adjacent rotor punchings 100, or, in another embodiment, a plurality of fan-shaped portions 170 are all connected to the inner ring portion 160, and the rotor punching 100 is integrally formed. In addition, the fan-shaped portions 170 on different rotor punchings 100 can be stacked and formed by buckling, or can be stacked into a rotor core by gluing or welding. In this way, when the fan-shaped portion 170 is connected to the inner ring portion 160 through a connecting bridge, the spring sheet 120 is arranged on the outer wall of the inner ring portion 160, and has a portion that radially extends into the magnetic steel slot 110 radially opposite to the rotor punching 100, so as to press against the magnetic steel 200, ensure the elastic deformation space of the spring sheet 120, and further ensure the stability of the magnetic steel 200 in the magnetic steel slot 110.
[0062] Further, in this embodiment, please refer to Figure 2 , Figure 5 and Figure 6A avoidance zone is formed between at least part of the magnetic steel slot 110 and the inner ring portion 160. The avoidance zone on one rotor punching 100 corresponds to the spring sheet 120 of the axially adjacent rotor punching 100. In the installation direction of the magnetic steel 200, multiple avoidance zones are located on the same side of the axially adjacent spring sheets 120 along the rotor core. It should be noted that multiple avoidance zones are located on the same side of the axially adjacent spring pieces 120 along the rotor core, which is expressed as follows: referring to a certain magnetic steel slot 110, the magnetic steel slot 110 is arranged through the axial direction of the rotor core, and along a certain axial direction, there is at least one adjacent avoidance zone in front of each spring piece 120, and the area of the avoidance zone is larger than the spring piece 120, and the magnetic steel 200 is installed in the magnetic steel slot 110 along this direction. In this way, during the installation process of the magnetic steel 200, the avoidance zone provides a deformation space for the spring piece 120, so that the spring piece 120 can be deformed smoothly, thereby ensuring the elastic force of the spring piece 120 on the magnetic steel 200 and reducing the difficulty of installing the magnetic steel 200. Of course, in the axial direction of the rotor punching 100, the two rotor punchings 100 adjacent to the spring sheet 120 have their avoidance areas axially opposite to the spring sheet 120. While ensuring the smooth deformation of the spring sheet 120, the magnet 200 can be installed in the magnet slot 110 at any end of the magnet 200, thereby improving the installation convenience of the magnet 200.
[0063] Among them, in this embodiment, the spring sheet 120 is located on one side of the magnetic steel slot 110 close to the center of the rotor punching 100, that is, it is arranged on the outer periphery of the inner ring portion 160 and partially extends into the magnetic steel slot 110. Similarly, the avoidance zone is also formed between the inner ring portion 160 and the magnetic steel slot 110. It can be understood that the above structure of the rotor core is realized by stacking the rotor punchings 100 by rotating the rotor punchings 100 at a specific angle during the stacking process of the rotor punchings 100. The stacking angle requires that the spring sheet 120 of the rotated rotor punching 100 and the avoidance zone of the adjacent rotor punching 100 are opposite in the axial direction of the rotor core, or different structures can be set for adjacent rotor punchings 100 for alternating or regular axial stacking to ensure that the spring sheet 120 at the adjacent axial position is the avoidance zone. Of course, in other embodiments, the thickness of the spring sheet 120 can be controlled to be smaller than the thickness of the rotor punching 100 so that the elasticity has a certain deformation space, so that it can be elastically pressed against the magnet 200, or the spring sheet 120 or the avoidance area is located in the magnet slot 110 and is arranged along the circumferential side slot wall of the rotor punching 100.
[0064] Specifically, in this embodiment, please refer to Figure 1, two sections of magnetic steel 200 are installed in the same magnetic steel slot 110, and the two magnetic steels 200 are installed facing each other from the axial ends of the magnetic steel slot 110. It should be noted that in the installation direction of any magnetic steel 200, the avoidance area of the front rotor punching 100 is always axially opposite to the spring sheet 120 of the adjacent rear rotor punching 100, thereby providing elastic deformation space for the spring sheet 120 and ensuring the tightening effect of the spring sheet 120 on the magnetic steel 200. In this way, the bidirectional installation of the magnetic steel 200 improves the assembly convenience of the rotor core.
[0065] Further, in this embodiment, please refer to Figure 5 and Figure 6 , the number of rotor poles of the rotor structure is defined as p, and the radial angles of adjacent avoidance areas and spring sheets 120 on the same rotor punching 100 along the rotor punching 100 satisfy: 360° / p or 360° / (p / 2). It should be noted that p is not only the number of rotor poles of the rotor structure, but also equal to the number of magnetic steel slots 110 in the rotor punching 100. In this way, 360° / p can be expressed as the angle between two adjacent magnetic steel slots 110 with the center of the rotor punching 100 as the center of the circle, and 360° / (p / 2) means that there is a magnetic steel slot 110 between two magnetic steel slots 110, and it is the angle between the two magnetic steel slots 110 with the center of the rotor punching 100 as the center of the circle. In addition, on the same circumferential direction of the rotor punching 100, the magnetic steel slot 110 with the avoidance area is located in front of the magnetic steel slot 110 with the spring sheet 120. When the two are adjacent to each other, the rotation angle of multiple rotor punchings 100 in stacking is 360° / p. When the two are separated by a magnetic steel slot 110, the rotation angle of multiple rotor punchings 100 in stacking is 360° / (p / 2). Of course, the same rotor punching sheet 100 can be provided with two magnetic steel slots 110 with avoidance zones, and the two magnetic steel slots 110 are sequentially located on the circumferential front side of the adjacent magnetic steel slots 110 with the spring sheet 120, so that the rotor punching sheet 100 can be selected to rotate 360° / p or 360° / (p / 2) and stack, which improves the operational convenience of the rotor core forming, and ensures that the avoidance zone can increase the deformation space for the spring sheet 120, so that the magnetic steel 200 can be stabilized in the magnetic steel slot 110 under the elastic pressing action of the spring sheet 120. Of course, when two or more magnetic steel slots 110 are sandwiched between the magnetic steel slot 110 with the avoidance zone and the magnetic steel slot 110 with the spring sheet 120, the rotation angle of the rotor punching sheet 100 during the rotation and stacking process can be n×(360° / p), where n is an integer greater than 3.
[0066] In one embodiment, please refer to Figure 2 and Figure 3, the magnetic steel slot 110 is provided with at least two spring pieces 120 extending in parallel, and the lengths of the spring pieces 120 of the same magnetic steel slot 110 have a difference. It should be noted that the lengths of the spring pieces 120 referred to in this embodiment all represent the lengths when the magnetic steel 200 is not installed in the magnetic steel slot 110, that is, the spring pieces 120 are not deformed, and the difference referred to above is greater than zero and less than the maximum length of the spring piece 120 extending into the magnetic steel slot 110. It can be understood that, during the process of installing the magnet 200 in the magnet slot 110, the longer spring piece 120 in the same magnet slot 110 first abuts against the magnet 200, and the shorter spring piece 120 then abuts against the magnet 200. After the magnet 200 is installed in the magnet slot 110, the two spring pieces 120 in the same magnet slot 110 extend into the magnet slot 110 to the same length. At this time, the elasticity of the two spring pieces 120 is not the same. The longer spring piece 120 has a greater degree of elastic deformation and exerts a greater pressing force on the magnet 200. In this way, the two spring pieces 120 of different lengths can ensure that the magnet 200 is in full contact with the side wall of the magnet slot 110 under various conditions, thereby providing sufficient fixing strength for the magnet 200 and ensuring the stable operation of the motor or compressor. Of course, in other embodiments, spring clips 120 may be provided on different groove side walls of the same magnetic steel groove 110 , and different spring clips 120 may have different lengths, so as to press spring clips 200 of different lengths on the same magnetic steel 200 , thereby ensuring the reliability of the magnetic steel 200 maintaining stability in the magnetic steel groove 110 .
[0067] In one embodiment, please refer to Figure 1 , the rotor also includes an end plate 300 arranged at both ends of the rotor core, and the thickness of the end plate 300 is defined as W3, and the thickness of the rotor punching 100 is defined as T. Referring to the above definitions of H and W, T, W3, H and W satisfy: 3×T≤W3≤H / W. It should be noted that the rotor punching 100 and the magnetic steel 200 are both sandwiched between the two end plates 300 to ensure the integrity of the rotor. In particular, the thickness of the end plate 300 is limited to satisfy: 3×T≤W3≤H / W, so that the thickness of the end plate 300 is adapted to the size of the magnetic steel 200 and the thickness of the rotor punching 100, so as to ensure that the thickness of the two ends of the rotor can be slightly heavier, so that it can be in a good balance state during the rotation of the rotor, and the output power of the motor or compressor can be guaranteed. Specifically, in this embodiment, please continue to refer to Figure 1 The end plate 300 is provided with a rivet hole 310, and the rotor punching 100 is provided with an avoidance hole 130. The avoidance hole 130 and the rivet hole 310 are opposite to each other in the axial direction of the rotor core. Then, the rivet 400 is passed through the avoidance hole 130 and riveted on the rivet hole 310, thereby ensuring the axial stability of the rotor core. Of course, the rotor punchings 100 and the rotor punchings 100 and the end plate 300 can be riveted through the riveting points.
[0068] In one embodiment, please refer to Figure 5and Figure 6 The rotor core is formed by buckling and stacking a plurality of rotor punching sheets 100. Specifically, a plurality of buckle points 150 are evenly distributed on the rotor punching sheets 100, and two adjacent rotor punching sheets 100 are buckled and stacked by the buckle points 150, thereby ensuring the connection stability between the rotor punching sheets 100 and the rotor punching sheets 100, and then ensuring the integrity of the rotor core, avoiding abnormal noise or affecting the output efficiency of the rotor. Of course, in other embodiments, adjacent rotor punching sheets 100 can also be stacked into the rotor core by gluing or welding.
[0069] In one embodiment, please refer to Figure 1 and Figure 6 The rotor sheet 100 includes a plurality of first rotor sheets 100 and a second rotor sheet 100 sandwiched between the first rotor sheet 100 and the end plate 300. The outer periphery of the second rotor sheet 100 is continuously arranged, and the magnetic steel slots 110 of the first rotor sheet 100 are arranged through the outer periphery. It should be noted that the magnetic steel slots 110 of the first rotor sheet 100, which occupy a large number of first rotor sheets 100, penetrate the outer periphery of the rotor sheet 100 in the radial direction of the first rotor sheet 100. The side slot wall of the magnetic steel slot 110 close to the outer periphery of the first rotor sheet 100 has a limiting convex portion (not shown in the figure) for the magnetic steel slot 110, thereby ensuring the stability of the magnetic steel 200 in the magnetic steel slot 110, and the arrangement of penetrating the outer periphery of the first rotor sheet 100 improves the magnetic flux density, ensures the interaction force between the stator and the rotor, and thus improves the output power of the motor or compressor. As for the second rotor punching 100, it is continuously arranged in the circumferential direction, that is, the side slot wall of the magnetic steel slot 110 close to the outer periphery of the second rotor punching 100 is continuously arranged, corresponding to the formation of a bridge 140 between the magnetic steel slot 110 and the stator. It can be understood that the structural strength of the second rotor punching 100 is greater than that of the first rotor punching 100. At the same time, the second rotor punching 100 is arranged between the first rotor punching 100 and the end plate 300, which can improve the integrity of the rotor core and prevent the magnetic steel 200 from moving out of the magnetic steel slot 110 under severe vibration. Of course, in other embodiments, the rotor punching 100 can also be configured as the first rotor punching 100 or the second rotor punching 100.
[0070] In one embodiment, please refer to Figure 1 The gap between the magnet 200 and the corresponding magnet slot 110 is W2, and W2 satisfies: 0.05mm≤W2≤0.15mm. The magnet 200 and the magnet slot 110 are clearance-matched during installation, which improves the convenience of installing the magnet 200 in the installation slot. At the same time, under the limiting effect of the spring piece 120 and the end plate 300, the magnet 200 can be stably in the magnet slot 110 to avoid abnormal noise during the rotation of the rotor and ensure the output power of the motor.
[0071] For the motor, in this embodiment, the number of slot poles of the stator is defined as m, and the number of magnetic steel slots 110 of a rotor punching 100 is defined as m±2×k, where k is 1 or 2. That is, the difference between the number of slot poles of the stator and the number of poles of the rotor is a multiple of 2, and the preferred difference is 2 or 4. In this way, during the rotation of the rotor, the pulsation caused by the cogging torque of the rotor and the stator can be reduced, thereby improving the stability and smoothness of the rotor rotation, and further improving the output torque of the motor.
[0072] The utility model also provides a motor, which includes a stator and a rotor. The specific structure of the rotor refers to the above embodiment. Since the motor adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, a center hole is provided in the stator, and the rotor is rotatably arranged in the center hole.
[0073] The utility model also provides a compressor, which includes the above motor. The specific structure of the motor refers to the above embodiment. Since the compressor adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the housing of the motor can be the same housing as the housing of the compressor, or they can be independently arranged.
[0074] The utility model also proposes a refrigeration device, which includes the above-mentioned compressor. The specific structure of the compressor refers to the above-mentioned embodiment. Since the refrigeration device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.
[0075] The above description is only an optional embodiment of the present invention, and does not limit the protection scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the protection scope of the present invention.
Claims
1. A rotor, characterized in that: include: A rotor core, wherein the rotor core is formed by stacking a plurality of rotor punchings, wherein the rotor punchings are provided with a plurality of circumferentially distributed magnetic steel slots, and the extension direction of the magnetic steel slots is inclined relative to the radial direction of the rotor punchings; as well as A plurality of magnetic steels are adapted and installed in the plurality of magnetic steel slots one by one, and the cross section of the magnetic steel is parallelogram-like, including a rectangular area in the middle and triangular areas located at opposite ends of the rectangular area, and the triangular areas and the rectangular areas are distributed along the length direction of the cross section of the magnetic steel.
2. The rotor according to claim 1, characterized in that The distance between the midpoints of the two short sides of the magnetic steel cross section is defined as H, the width of the rectangular area is defined as W, the length of the rectangular area is defined as H3, and the distances from the intersection of the two side edges of the triangular area to the rectangular area are defined as H2 and H1 respectively, and W, H, H3, H2 and H1 satisfy: (H / W)<H3 / (H1+H2).
3. The rotor according to claim 2, characterized in that The relative corner size of the two triangular areas is defined as J1, and J1, W, H, H3, H2 and H1 also satisfy: H / (H1+H2+H3)<sinJ1<(H / W)<H3 / (H1+H2).
4. The rotor according to claim 2, characterized in that The area of the rectangular area is defined as C, and the areas of the two triangular areas are defined as A and B respectively. A, B, C, H1, H2 and H3 satisfy: H3 / (H1+H2)<C / (A+B).
5. The rotor according to claim 4, characterized in that A and B satisfy: 1≤A / B≤1.1, and the triangular area corresponding to A is arranged close to the outer periphery of the rotor punching sheet; And / or, H2 and H1 satisfy: 1≤H1 / H2≤1.15, and the triangular area corresponding to H1 is arranged close to the outer periphery of the rotor punching.
6. The rotor according to claim 1, characterized in that The cross section of the magnetic steel is configured as a parallelogram, and the corners of the magnetic steel are configured as arc surfaces; And / or, the material of the magnetic steel is ferrite material or neodymium iron boron material.
7. The rotor according to claim 1, characterized in that The radial direction of the rotor punching sheet and the center line of the magnetic steel slot in the extension direction are defined as J2, and J2 satisfies: 10°≤J2≤40°.
8. The rotor according to claim 1, characterized in that At least a portion of the groove side walls of the magnetic steel groove are provided with spring plates, and the spring plates have a portion extending into the magnetic steel groove and pressing against the magnetic steel.
9. The rotor according to claim 8, characterized in that The rotor punching sheet includes an inner ring portion and a plurality of sector portions distributed circumferentially around the inner ring portion, two adjacent sector portions and the inner ring portion enclose the magnetic steel slot, and the spring sheet is arranged on the outer wall of the inner ring portion and extends radially along the rotor punching sheet.
10. The rotor according to claim 9, characterized in that An escape zone is formed between at least part of the magnetic steel slots and the inner ring portion, and the escape zone on one of the rotor punchings corresponds to a spring sheet of the axially adjacent rotor punching. In the installation direction of the magnetic steel, a plurality of the escape zones are located on the same side of the axially adjacent spring sheets along the rotor core.
11. The rotor according to claim 10, characterized in that The number of rotor poles of the rotor is defined as p, and the radial angle between the avoidance area and the spring sheet adjacent to each other on the same rotor punching sheet satisfies: 360° / p or 360° / (p / 2).
12. The rotor according to claim 8, characterized in that The magnetic steel slot is provided with at least two spring sheets extending in parallel, and the lengths of the spring sheets in the same magnetic steel slot have a difference.
13. The rotor according to claim 1, characterized in that The rotor also includes end plates arranged at both ends of the rotor core, the thickness of the end plates is defined as W3, the thickness of the rotor punching sheets is defined as T, the distance between the midpoints of the two short sides of the magnetic steel cross section is defined as H, and the width of the rectangular area is defined as W, and T, W3, H and W satisfy: 3×T≤W3≤H / W.
14. The rotor according to claim 13, characterized in that The rotor core is formed by buckling and stacking a plurality of rotor punching sheets; And / or, the rotor punching includes a plurality of first rotor punchings and a second rotor punching sandwiched between the first rotor punchings and the end plate, the outer circumference of the second rotor punchings is continuously arranged, and the magnetic steel slots of the first rotor punchings are arranged through the outer circumference; And / or, the rotor further includes rivets, the rivets extend along the axial direction of the rotor core, and the end plates and the rotor punching sheets are fixed by riveting.
15. A rotor according to any one of claims 1 to 14, characterized in that The gap between the magnetic steel and the corresponding magnetic steel slot is W2, and W2 satisfies: 0.05mm≤W2≤0.15mm; And / or, two sections of the magnetic steel are installed in the same magnetic steel slot, and the two magnetic steels are installed facing each other from two axial ends of the magnetic steel slot; And / or, the number of slot poles of the stator is defined as m, and the number of magnetic steel slots of the rotor punching sheet is defined as m±2×k, where k is 1 or 2.
16. A motor, characterized in that: The invention comprises a stator and a rotor as claimed in any one of claims 1 to 15.
17. A compressor, characterized in that: Comprising the motor as claimed in claim 16.
18. A refrigeration device, characterized in that: Comprising the compressor of claim 17.