Rotor core, rotor structure, motor and refrigerator

Abstract

The utility model discloses a rotor core, a rotor structure, a motor and a refrigerator, and relates to the technical field of motors. Wherein the rotor core comprises a plurality of rotor punching sheets which are sequentially stacked, each rotor punching sheet comprises an annular magnetic sheet and a plurality of fan-shaped sheets which are arranged around the annular magnetic sheet at intervals, the annular magnetic sheets are stacked to form a shaft ring part, the fan-shaped sheets are stacked to form fan-shaped parts, and a containing groove is formed between every two adjacent fan-shaped parts; in the same rotor punching sheet, part of the fanning strips are connected with the annular magnetic sheet through the connecting keys, and part of the fanning strips are disconnected from the annular magnetic sheet; or, the fanning strips of part of the rotor punching sheets are connected with the annular magnetic sheets through the connecting keys, and the fanning strips of part of the rotor punching sheets are disconnected with the annular magnetic sheets; the annular magnetic sheet is provided with a supporting boss corresponding to the containing groove, the supporting boss is used for supporting the permanent magnet, and the width W1 of the connecting key is smaller than or equal to the width W2 of the supporting boss. According to the technical scheme provided by the utility model, the problem of large flux leakage of the rotor core can be improved, and the motor performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a rotor core, a rotor structure, a motor and a refrigerator. Background Art

[0002] A brushless DC motor is usually used in refrigerator compressors, which has a simple structure and reliable operation. In the related art, the rotor core of the motor has a large magnetic leakage, resulting in poor motor performance. Utility Model Content

[0003] The main purpose of the utility model is to provide a rotor core, a rotor structure, a motor and a refrigerator, aiming to improve the problem of large magnetic leakage of the rotor core and improve the performance of the motor.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a rotor core, comprising:

[0005] A plurality of rotor punchings are stacked in sequence, the rotor punchings comprising an annular magnetic sheet and a plurality of sector-shaped sheets spaced around the annular magnetic sheet, the plurality of annular magnetic sheets are stacked to form a shaft collar portion, the plurality of sector-shaped sheets are stacked to form a sector-shaped portion, and a receiving groove is formed between two adjacent sector-shaped portions;

[0006] Wherein, in the same rotor punching, some of the sector-shaped sheets are connected to the annular magnetic sheets by connecting keys, and some of the sector-shaped sheets are disconnected from the annular magnetic sheets; or, the sector-shaped sheets of some of the rotor punchings are connected to the annular magnetic sheets by connecting keys, and the sector-shaped sheets of some of the rotor punchings are disconnected from the annular magnetic sheets;

[0007] The annular magnetic sheet is provided with a supporting boss corresponding to the accommodating groove, the supporting boss is used to support the permanent magnet, and the width W1 of the connecting key is less than or equal to the width W2 of the supporting boss.

[0008] In one embodiment, the rotor core includes a first punching sheet group and a second punching sheet group which are stacked, and the first punching sheet group and the second punching sheet group each include a plurality of rotor punching sheets which are stacked in sequence;

[0009] The sector-shaped sheets in the first punching sheet group are connected to the annular magnetic sheets, and the sector-shaped sheets in the second punching sheet group are disconnected from the annular magnetic sheets;

[0010] Alternatively, the fan-shaped sheets in the first punching sheet group are connected to and disconnected from the annular magnetic sheets and are arranged alternately, and the fan-shaped sheets in the second punching sheet group are connected to and disconnected from the annular magnetic sheets and are arranged alternately; the fan-shaped sheets in the first punching sheet group that are connected to the annular magnetic sheets and the fan-shaped sheets in the second punching sheet group that are disconnected from the annular magnetic sheets are arranged in a stacked manner.

[0011] In one implementation, the height of the rotor core is defined as L, and the height of the first punching sheet group is 0.1L-0.9L.

[0012] In one embodiment, the rotor core includes a plurality of first punching sheet groups and a plurality of second punching sheet groups, the plurality of first punching sheet groups and the plurality of second punching sheet groups are alternately stacked, and the first punching sheet group and the second punching sheet group each include a plurality of rotor punching sheets stacked in sequence;

[0013] The sector-shaped sheets in the first punching sheet group are connected and disconnected with the annular magnetic sheets and are arranged alternately, and the sector-shaped sheets in the second punching sheet group are connected and disconnected with the annular magnetic sheets and are arranged alternately;

[0014] In the adjacent first punching sheet group and the second punching sheet group, the sector-shaped sheets connected to the annular magnetic sheets in the first punching sheet group and the sector-shaped sheets disconnected from the annular magnetic sheets in the second punching sheet group are stacked.

[0015] In one implementation, the height of the rotor core is defined as L, and the height of the first punching sheet group and the second punching sheet group is 0.1L-0.2L.

[0016] In one embodiment, the connection key and the support boss satisfy: 0.1≤W1 / W2≤1;

[0017] And / or, the width W2 of the supporting boss satisfies: 0.3 mm ≤ W2 ≤ 4 mm;

[0018] And / or, the dimension of the supporting boss in the radial direction of the annular magnetic sheet is defined as T, then the following is satisfied: 0.25≤W2 / T≤0.85.

[0019] In one embodiment, protrusions are provided on both sides of the sector-shaped piece, the protrusions are arranged away from the annular magnetic piece, and a magnetic isolation opening is formed between two opposite protrusions in two adjacent sector-shaped pieces.

[0020] In one embodiment, the dimension of the protrusion in the radial direction of the annular magnetic sheet is defined as T1, which satisfies: 0.3 mm ≤ T1 ≤ 5 mm.

[0021] In one embodiment, some of the annular magnetic sheets of the rotor punchings are large-hole annular magnetic sheets, and some of the annular magnetic sheets of the rotor punchings are small-hole annular magnetic sheets. The inner diameter of the large-hole annular magnetic sheets is larger than the inner diameter of the small-hole annular magnetic sheets, and the large-hole annular magnetic sheets are used to fit with the crankcase in a clearance, and the small-hole annular magnetic sheets are used to fit with the crankshaft in an interference fit.

[0022] In one implementation, the inner diameter and outer diameter of the large-hole ring magnetic sheet are defined as D1 and D2 respectively, and the following is satisfied: 0.3 mm ≤ (D2 - D1) / 2 ≤ 5 mm.

[0023] In one embodiment, the sector-shaped piece is provided with a locking hole, and a plurality of the sector-shaped pieces stacked in sequence cooperate with the locking hole through a locking member.

[0024] The utility model also provides a rotor structure, comprising:

[0025] A rotor core as described above;

[0026] The permanent magnet is arranged in the receiving groove of the rotor core.

[0027] In one implementation, the width of the permanent magnet in the tangential direction of the rotor core is defined as W, and the height of the permanent magnet in the radial direction of the rotor core is defined as H, and then: 0.2≤W / H≤1.5 is satisfied.

[0028] In one embodiment, the width of the magnetic isolation opening of the rotor core in the tangential direction of the rotor core is defined as C, and the following is satisfied: 0.3≤C / W≤0.8.

[0029] In one embodiment, a magnetic isolation hole is formed between the permanent magnet and the sector portion, the shaft ring portion, and the supporting boss.

[0030] The utility model also provides a motor, comprising:

[0031] A rotor structure as described above;

[0032] The stator structure is sleeved on the rotor structure.

[0033] The utility model also provides a refrigerator, comprising the motor as described above.

[0034] The technical solution of the utility model is that in the same rotor punching, part of the sector-shaped sheets are connected to the annular magnetic sheets by connecting keys, and part of the sector-shaped sheets are disconnected from the annular magnetic sheets; or the sector-shaped sheets of part of the rotor punching are connected to the annular magnetic sheets by connecting keys, and the sector-shaped sheets of part of the rotor punching are disconnected from the annular magnetic sheets. That is, at least part of the sector-shaped sheets are disconnected from the annular magnetic sheets, so that an air gap magnetic resistance is formed between the sector-shaped sheets and the annular magnetic sheets, which can block the rotor core from forming a magnetic circuit, so that the magnetic wave of the rotor core is smaller and the magnetic field strength is higher, thereby effectively reducing the leakage magnetic flux of the rotor core, improving the back electromotive force coefficient of the rotor core, and then improving the power density and efficiency of the motor, thereby improving the performance of the motor.

[0035] Furthermore, by making the width of the connecting key less than or equal to the width of the supporting boss, a connecting key of smaller width can be used to connect the sector sheet and the annular magnetic sheet. This can also make the magnetic wave of the rotor core smaller and the magnetic field strength higher, thereby better reducing the leakage magnetic flux of the rotor core. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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.

[0037] Figure 1 A schematic structural diagram of an embodiment of a rotor core provided by the utility model;

[0038] Figure 2 It is a schematic diagram of the assembly of an embodiment of a rotor core provided by the utility model;

[0039] Figure 3 A partial structural schematic diagram of an embodiment of a rotor core provided by the utility model;

[0040] Figure 4 A partial structural schematic diagram of another embodiment of the rotor core provided by the utility model;

[0041] Figure 5 A schematic diagram of the structure in which the large-hole ring magnetic sheet and the sector-shaped sheet are disconnected in one embodiment of the rotor core provided by the utility model;

[0042] Figure 6 A schematic structural diagram of a rotor core embodiment provided by the utility model in which a large-hole ring magnetic sheet and a sector-shaped sheet are connected via a connecting key;

[0043] Figure 7 A schematic structural diagram of another embodiment of the rotor core provided by the utility model, in which the large-hole ring magnetic sheets and the sector-shaped sheets are connected and disconnected and arranged alternately with each other;

[0044] Figure 8 A schematic diagram of the structure in which the small hole ring magnetic sheet and the sector-shaped sheet are disconnected in one embodiment of the rotor core provided by the utility model;

[0045] Fig. 9 A schematic structural diagram of a rotor core embodiment provided by the utility model in which a small hole ring magnetic sheet and a sector-shaped sheet are connected via a connecting key;

[0046] Fig.10 A schematic diagram of a structure in which the small hole ring magnetic sheets and the sector-shaped sheets are connected and disconnected and arranged alternately in another embodiment of the rotor core provided by the utility model

[0047] Fig.11 A schematic structural diagram of an embodiment of a rotor structure provided by the utility model;

[0048] Fig.12A schematic diagram of the structure of a permanent magnet in an embodiment of a rotor structure provided by the utility model;

[0049] Fig.13 This is a schematic structural diagram of an embodiment of a motor provided by the utility model.

[0050] Description of Figure Numbers:

[0051] 1000, motor; 100, rotor structure; 10, rotor core; 10a, first punching sheet group; 10b, second punching sheet group; 11, rotor punching sheet; 11a, collar portion; 111, annular magnetic sheet; 111a, large-hole annular magnetic sheet; 111b, small-hole annular magnetic sheet; 11b, fan-shaped portion; 112, fan-shaped sheet; 11c, accommodating groove; 1121, protrusion; 1122, magnetic isolation port; 1123, locking hole; 1124, locking attachment; 113, connecting key; 114, supporting boss; 12, end cover; 20, permanent magnet; 30, magnetic isolation hole; 200, stator structure.

[0052] 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

[0053] 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.

[0054] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0055] 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 limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy 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 combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0056] A brushless DC motor is usually used in refrigerator compressors, which has a simple structure and reliable operation. In the related art, the rotor core of the motor has a large magnetic leakage, resulting in poor motor performance.

[0057] Based on the above problems, the utility model proposes a rotor core, aiming to improve the problem of large magnetic leakage of the rotor core and improve the performance of the motor.

[0058] See also Figures 1 to 7 In one embodiment of the utility model, the rotor core 10 includes a plurality of rotor punchings 11 stacked in sequence, the rotor punchings 11 include an annular magnetic sheet 111 and a plurality of sector-shaped sheets 112 spaced around the annular magnetic sheet 111, the plurality of annular magnetic sheets 111 are stacked to form a shaft collar portion 11a, the plurality of sector-shaped sheets 112 are stacked to form a sector-shaped portion 11b, and a receiving groove 11c is formed between two adjacent sector-shaped portions 11b;

[0059] Among them, in the same rotor punching 11, some of the sector-shaped sheets 112 are connected to the annular magnetic sheets 111 through the connecting key 113, and some of the sector-shaped sheets 112 are disconnected from the annular magnetic sheets 111; or, the sector-shaped sheets 112 of some rotor punchings 11 are connected to the annular magnetic sheets 111 through the connecting key 113, and some of the sector-shaped sheets 112 of the rotor punchings 11 are disconnected from the annular magnetic sheets 111; the annular magnetic sheet 111 is provided with a supporting boss 114 arranged corresponding to the accommodating groove 11c, the supporting boss 114 is used to support the permanent magnet 20, and the width W1 of the connecting key 113 is less than or equal to the width W2 of the supporting boss 114.

[0060] The technical solution of the utility model is that in the same rotor punching 11, part of the sector-shaped pieces 112 are connected to the annular magnetic piece 111 through the connecting key 113, and part of the sector-shaped pieces 112 are disconnected from the annular magnetic piece 111; or the sector-shaped pieces 112 of part of the rotor punching 11 are connected to the annular magnetic piece 111 through the connecting key 113, and part of the sector-shaped pieces 112 of the rotor punching 11 are disconnected from the annular magnetic piece 111. That is, at least part of the sector-shaped pieces 112 are disconnected from the annular magnetic piece 111, so that an air gap magnetic resistance is formed between the part of the sector-shaped pieces 112 and the annular magnetic piece 111, which can block the rotor core 10 from forming a magnetic circuit, so that the magnetic wave of the rotor core 10 is smaller and the magnetic field strength is higher, thereby effectively reducing the leakage magnetic flux of the rotor core 10, improving the back electromotive force coefficient of the rotor core 10, and then improving the power density and efficiency of the motor 1000, thereby improving the performance of the motor 1000.

[0061] Furthermore, by making the width of the connecting key 113 less than or equal to the width of the supporting boss 114, a connecting key 113 with a smaller width can be used to connect the sector piece 112 and the annular magnetic piece 111. This can also make the magnetic wave of the rotor core 10 smaller and the magnetic field intensity higher, thereby better reducing the leakage magnetic flux of the rotor core 10.

[0062] In this embodiment, an accommodating groove 11c is formed between two adjacent sector-shaped portions 11b, so that a plurality of accommodating grooves 11c distributed at intervals can be formed on the rotor core 10 along the circumference of the shaft collar portion 11a, and each accommodating groove 11c is used to install a permanent magnet 20, that is, a plurality of permanent magnets 20 and a plurality of sector-shaped portions 11b are alternately arranged along the circumference of the shaft collar portion 11a.

[0063] As some examples, the rotor core 10 can cooperate with the crankshaft during use. The crankshaft is inserted into the axial hole of the shaft ring part 11a. The crankshaft and the axial hole of the shaft ring part 11a can be spaced or interference fit, as long as the crankshaft can be driven to rotate during rotation by the rotor core 10.

[0064] It should be noted that the width W1 of the connection key 113 refers to the width of the connection key 113 in the tangential direction of the annular magnetic sheet 111 . Similarly, the width W2 of the support boss 114 refers to the width of the support boss 114 in the tangential direction of the annular magnetic sheet 111 .

[0065] It should be noted that, in the same rotor punching 11, some of the sector-shaped pieces 112 are connected to the annular magnetic pieces 111 via the connecting key 113, and some of the sector-shaped pieces 112 are disconnected from the annular magnetic pieces 111. Specifically, it can be: some of the sector-shaped pieces 112 of each rotor punching 11 are connected to the annular magnetic pieces 111 via the connecting key 113, and some of the sector-shaped pieces 112 are disconnected from the annular magnetic pieces 111; or, only some of the sector-shaped pieces 112 of some of the rotor punchings 11 are connected to the annular magnetic pieces 111 via the connecting key 113, and some of the sector-shaped pieces 112 are disconnected from the annular magnetic pieces 111, while the sector-shaped pieces 112 of the remaining rotor punchings 11 may be either all connected or all disconnected from the annular magnetic pieces 111.

[0066] Furthermore, the sector-shaped sheets 112 of some rotor sheets 11 are connected to the annular magnetic sheets 111 via the connecting key 113, while the sector-shaped sheets 112 of some rotor sheets 11 are disconnected from the annular magnetic sheets 111. Specifically, all the sector-shaped sheets 112 of some rotor sheets 11 are connected to the annular magnetic sheets 111 via the connecting key 113, while all the sector-shaped sheets 112 of some rotor sheets 11 are disconnected from the annular magnetic sheets 111; or, some sector-shaped sheets 112 of some rotor sheets 11 are connected to the annular magnetic sheets 111 via the connecting key 113, while the remaining sector-shaped sheets 112 are disconnected from the annular magnetic sheets 111.

[0067] In actual application, the number of sector sheets 112 in each rotor punching sheet 11 can be 6, 8, 10, etc., and the corresponding number of accommodating slots 11c can be 6, 8, 10, etc., that is, the number of permanent magnets 20 that can be installed in the rotor structure 100 can be 6, 8, 10, etc.

[0068] As some examples, the number of sector sheets 112 in each rotor punching 11 of the rotor core 10 proposed by the present invention can be 10, so that the number of permanent magnets 20 installed in the rotor structure 100 using the rotor core 10 can also be 10, which can make the magnetic field strength of the rotor structure 100 stronger.

[0069] Optionally, see Figure 3 , Figure 5 , Figure 6 In one embodiment of the utility model, the rotor core 10 includes a first punching sheet group 10a and a second punching sheet group 10b which are stacked, and the first punching sheet group 10a and the second punching sheet group 10b both include a plurality of rotor punching sheets 11 which are stacked in sequence; the sector-shaped sheets 112 in the first punching sheet group 10a are connected to the annular magnetic sheets 111, and the sector-shaped sheets 112 in the second punching sheet group 10b are disconnected from the annular magnetic sheets 111.

[0070] By configuring in this way, by connecting all the sector-shaped sheets 112 in the first sheet group 10a to the annular magnetic sheets 111 via the connecting key 113, and disconnecting all the sector-shaped sheets 112 in the second sheet group 10b from the annular magnetic sheets 111, it can be ensured that a sufficient number of sector-shaped sheets 112 are disconnected from the annular magnetic sheets 111, so that a sufficiently large air gap magnetic resistance is formed between this part of the sector-shaped sheets 112 and the annular magnetic sheets 111, which can better block the rotor core 10 from forming a magnetic circuit itself, so that the magnetic waves of the rotor core 10 are smaller and the magnetic field strength is higher, thereby better reducing the leakage magnetic flux of the rotor core 10.

[0071] In addition, since two adjacent layers of rotor punching sheets 11 are stacked and fixed, during the stacking process, the disconnected sector-shaped sheets 112 and annular magnetic sheets 111 in the first punching sheet group 10a can be fixed by the connected sector-shaped sheets 112 and annular magnetic sheets 111 in the second punching sheet group 10b to ensure that the positions of the disconnected sector-shaped sheets 112 and annular magnetic sheets 111 are relatively fixed.

[0072] In actual application, the number of rotor punches 11 in the first punch group 10a and the number of rotor punches 11 in the second punch group 10b can be the same or different. For example, the number of rotor punches 11 in the first punch group 10a can be more than the number of rotor punches 11 in the second punch group 10b, or can be less than the number of rotor punches 11 in the second punch group 10b.

[0073] Optionally, see Figure 3 In one embodiment of the utility model, the height of the rotor core 10 is defined as L, and the height of the first punching sheet group 10a is 0.1L-0.9L. Correspondingly, the height of the second punching sheet group 10b is 0.1L-0.9L. Such a setting can ensure the height of the second punching sheet group 10b, so as to ensure that there are enough sector sheets 112 and the annular magnetic sheet 111 to be disconnected, so that a sufficiently large air gap magnetic resistance is formed between the sector sheets 112 and the annular magnetic sheet 111, which can better prevent the rotor core 10 from forming a magnetic circuit itself, and can better reduce the leakage magnetic flux of the rotor core 10.

[0074] It should be noted that the height L of the rotor core 10 refers to the height of the rotor core 10 in the axial direction thereof.

[0075] As some exemplary examples, the height of the second punching sheet group 10 b may be 0.1L, 0.2L, 0.3L, 0.4L, 0.5L, 0.6L, 0.7L, 0.8L, 0.9L, etc.

[0076] It should be noted that, on the basis of ensuring the connection reliability of the rotor core 10 , the height of the second punching sheet group 10 b is as large as possible, so that a larger air gap magnetic resistance can be formed to fully reduce the magnetic leakage of the rotor core 10 .

[0077] Optionally, see Figure 4 , Figure 7 In another embodiment of the utility model, the rotor core 10 includes a first punching sheet group 10a and a second punching sheet group 10b which are stacked, and the first punching sheet group 10a and the second punching sheet group 10b both include a plurality of rotor punching sheets 11 which are stacked in sequence; the sector-shaped sheets 112 in the first punching sheet group 10a are connected to and disconnected from the annular magnetic sheets 111 and are staggered with each other, and the sector-shaped sheets 112 in the second punching sheet group 10b are connected to and disconnected from the annular magnetic sheets 111 and are staggered with each other; the sector-shaped sheets 112 in the first punching sheet group 10a which are connected to the annular magnetic sheets 111 and the sector-shaped sheets 112 in the second punching sheet group 10b which are disconnected from the annular magnetic sheets 111 are stacked.

[0078] In this way, by making the sector-shaped sheets 112 in the first punching sheet group 10a connected and disconnected with the annular magnetic sheets 111 alternately arranged, and the sector-shaped sheets 112 in the second punching sheet group 10b connected and disconnected with the annular magnetic sheets 111 alternately arranged, it can also be ensured that there are enough sector-shaped sheets 112 and the annular magnetic sheets 111 disconnected, so that a sufficiently large air gap magnetic resistance is formed between this part of the sector-shaped sheets 112 and the annular magnetic sheets 111, which can better block the rotor core 10 from forming a magnetic circuit itself, so that the magnetic waves of the rotor core 10 are smaller and the magnetic field strength is higher, thereby better reducing the leakage magnetic flux of the rotor core 10.

[0079] In addition, by stacking the sector-shaped sheets 112 connected to the annular magnetic sheets 111 in the first sheet group 10a and the sector-shaped sheets 112 disconnected from the annular magnetic sheets 111 in the second sheet group 10b, since the two adjacent layers of rotor sheets 11 are stacked and fixed, during the stacking process, the sector-shaped sheets 112 and annular magnetic sheets 111 connected in the first sheet group 10a can be used to fix the sector-shaped sheets 112 and annular magnetic sheets 111 disconnected in the second sheet group 10b, and the sector-shaped sheets 112 and annular magnetic sheets 111 connected in the second sheet group 10b can be used to fix the sector-shaped sheets 112 and annular magnetic sheets 111 disconnected in the first sheet group 10a, so as to ensure that the positions of the disconnected sector-shaped sheets 112 and annular magnetic sheets 111 are relatively fixed.

[0080] It should be noted that the sector-shaped sheets 112 connected to the annular magnetic sheet 111 in the first punching sheet group 10a and the sector-shaped sheets 112 disconnected from the annular magnetic sheet 111 in the second punching sheet group 10b are stacked, which is equivalent to the first punching sheet group 10a being able to overlap with the second punching sheet group 10b after rotating 360° / the number of sector-shaped sheets 112. For example, when the number of sector-shaped sheets 112 is 10, the first punching sheet group 10a can be overlapped with the second punching sheet group 10b after rotating 36°.

[0081] In actual application, the number of rotor punches 11 in the first punch group 10a and the number of rotor punches 11 in the second punch group 10b can be the same or different. For example, the number of rotor punches 11 in the first punch group 10a can be more than the number of rotor punches 11 in the second punch group 10b, or can be less than the number of rotor punches 11 in the second punch group 10b.

[0082] Optionally, see Figure 4 In one embodiment of the utility model, the height of the rotor core 10 is defined as L, and the height of the first punching sheet group 10a is 0.1L to 0.9L. Such a configuration can also ensure that there are enough segments 112 disconnected from the annular magnetic sheets 111, so that a sufficiently large air gap magnetic resistance is formed between the segments 112 and the annular magnetic sheets 111, which can better prevent the rotor core 10 from forming a magnetic circuit, and can better reduce the magnetic leakage of the rotor core 10.

[0083] As some exemplary examples, the height of the first punching sheet group 10 a may be 0.1L, 0.2L, 0.3L, 0.4L, 0.5L, 0.6L, 0.7L, 0.8L, 0.9L, and so on.

[0084] As some examples, since the number of disconnected sector sheets 112 and annular magnetic sheets 111 in the first sheet group 10a is equal to the number of disconnected sector sheets 112 and annular magnetic sheets 111 in the second sheet group 10b, in order to ensure the stability of the rotor core 10 itself, the height of the first sheet group 10a can be made consistent with the height of the second sheet, that is, the height of the first sheet group 10a can be 0.5L.

[0085] Optionally, see Figure 7 In another embodiment of the utility model, the rotor core 10 includes a plurality of first punching sheet groups 10a and a plurality of second punching sheet groups 10b, and the plurality of first punching sheet groups 10a and the plurality of second punching sheet groups 10b are arranged in an alternately stacked manner, and the first punching sheet group 10a and the second punching sheet group 10b each include a plurality of rotor punching sheets 11 which are stacked in sequence; the sector-shaped sheets 112 in the first punching sheet group 10a are connected to and disconnected from the annular magnetic sheets 111 and are arranged in an alternate manner, and the sector-shaped sheets 112 in the second punching sheet group 10b are connected to and disconnected from the annular magnetic sheets 111 and are arranged in an alternate manner; in adjacent first punching sheet groups 10a and second punching sheet groups 10b, the sector-shaped sheets 112 in the first punching sheet group 10a which are connected to the annular magnetic sheets 111 and the sector-shaped sheets 112 in the second punching sheet group 10b which are disconnected from the annular magnetic sheets 111 are stacked.

[0086] In this way, by making the rotor core 10 include multiple first punching sheet groups 10a and multiple second punching sheet groups 10b, and the fan-shaped sheets 112 in the first punching sheet group 10a are connected and disconnected with the annular magnetic sheets 111 in an alternating manner, and the fan-shaped sheets 112 in the second punching sheet group 10b are connected and disconnected with the annular magnetic sheets 111 in an alternating manner, it can also be ensured that there are enough fan-shaped sheets 112 and the annular magnetic sheets 111 disconnected, so that a sufficiently large air gap magnetic resistance is formed between this part of the fan-shaped sheets 112 and the annular magnetic sheets 111, which can better block the rotor core 10 from forming a magnetic circuit itself, so that the magnetic wave of the rotor core 10 is smaller and the magnetic field strength is higher, thereby better reducing the leakage magnetic flux of the rotor core 10.

[0087] In addition, by stacking the sector-shaped sheets 112 connected to the annular magnetic sheets 111 in the first sheet group 10a and the sector-shaped sheets 112 disconnected from the annular magnetic sheets 111 in the second sheet group 10b in the adjacent first sheet group 10a and second sheet group 10b, since the two adjacent layers of rotor sheets 11 are stacked and fixed, during the stacking process, the sector-shaped sheets 112 and the annular magnetic sheets 111 connected in the first sheet group 10a can be used to fix the disconnected sector-shaped sheets 112 and the annular magnetic sheets 111 in the second sheet group 10b, and the sector-shaped sheets 112 and the annular magnetic sheets 111 connected in the second sheet group 10b can be used to fix the disconnected sector-shaped sheets 112 and the annular magnetic sheets 111 in the first sheet group 10a, so as to ensure that the positions of the disconnected sector-shaped sheets 112 and the annular magnetic sheets 111 are relatively fixed.

[0088] It should be noted that, in the adjacent first punching sheet group 10a and the second punching sheet group 10b, the sector-shaped sheets 112 connected to the annular magnetic sheet 111 in the first punching sheet group 10a and the sector-shaped sheets 112 disconnected from the annular magnetic sheet 111 in the second punching sheet group 10b are stacked, which is equivalent to the first punching sheet group 10a being able to overlap with the second punching sheet group 10b after rotating 360° / the number of sector-shaped sheets 112. For example, when the number of sector-shaped sheets 112 is 10, the first punching sheet group 10a can be overlapped with the second punching sheet group 10b after rotating 36°.

[0089] In actual application, the number of rotor punches 11 in the first punch group 10a and the number of rotor punches 11 in the second punch group 10b can be the same or different. For example, the number of rotor punches 11 in the first punch group 10a can be more than the number of rotor punches 11 in the second punch group 10b, or can be less than the number of rotor punches 11 in the second punch group 10b.

[0090] Optionally, in an embodiment of the present invention, the height of the rotor core 10 is defined as L, and the height of the first punching sheet group 10a and the second punching sheet group 10b is 0.1L to 0.2L. Such a configuration can also ensure that there are enough segments 112 disconnected from the annular magnetic sheet 111, so that a sufficiently large air gap magnetic resistance is formed between the segment 112 and the annular magnetic sheet 111, which can better prevent the rotor core 10 from forming a magnetic circuit itself and better reduce the magnetic leakage of the rotor core 10.

[0091] As some examples, the height of the first punching sheet group 10a can be 0.1L, 0.11L, 0.12L, 0.13L, 0.14L, 0.15L, 0.16L, 0.17L, 0.18L, 0.19L, 0.2L, etc. The height of the second punching sheet group 10b can also be 0.1L, 0.11L, 0.12L, 0.13L, 0.14L, 0.15L, 0.16L, 0.17L, 0.18L, 0.19L, 0.2L, etc.

[0092] Optionally, see Figures 5 to 10 In one embodiment of the present invention, the connection key 113 and the support boss 114 satisfy: 0.1≤W1 / W2≤1, that is, the width W1 of the connection key 113 is 0.1 to 1 times the width W2 of the support boss 114.

[0093] Such a configuration can make the width of the connecting key 113 smaller, so that the connecting key 113 with a smaller width can be used to connect the sector piece 112 and the annular magnetic piece 111. This can make the magnetic wave of the rotor core 10 smaller and the magnetic field intensity higher, thereby better reducing the leakage magnetic flux of the rotor core 10.

[0094] As some exemplary examples, the ratio W1 / W2 between the width of the connecting key 113 and the width of the supporting boss 114 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.

[0095] Optionally, see Figures 5 to 10 In one embodiment of the present invention, the width W2 of the supporting boss 114 satisfies: 0.3 mm ≤ W2 ≤ 4 mm.

[0096] In this way, when the width W2 of the support boss 114 is too small, the support strength of the support boss 114 on the permanent magnet 20 is too small, and deformation, fracture, etc. are prone to occur, which affects the installation reliability of the permanent magnet 20; and when the width W2 of the support boss 114 is too large, it will not only cause the overall weight of the rotor core 10 to be large and the cost to be high, but also cause the rotor core 10 to form a magnetic circuit itself, resulting in magnetic leakage. Therefore, by controlling the width W2 of the support boss 114 to be between 0.3mm and 4mm, it can ensure that the permanent magnet 20 is effectively supported while effectively reducing the magnetic leakage of the rotor core 10.

[0097] As some exemplary examples, the width W2 of the supporting boss 114 can be 0.3 mm, 0.8 mm, 1 mm, 1.2 mm, 1.7 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc.

[0098] Optionally, see Figures 5 to 10 In one embodiment of the present invention, the radial dimension of the supporting boss 114 in the annular magnetic sheet 111 is defined as T, which satisfies: 0.25≤W2 / T≤0.85.

[0099] With such an arrangement, the permanent magnet 20 can be positioned, supported and fixed by the joint action of the support boss 114 and the accommodating groove 11c, so as to ensure the installation reliability of the permanent magnet 20. When the ratio W2 / T between the width of the support boss 114 and the radial dimension of the support boss 114 on the annular magnetic sheet 111 is too small, the radial dimension of the support boss 114 on the annular magnetic sheet 111 is larger, and the support boss 114 extends into the accommodating groove 11c, causing excessive squeezing of the permanent magnet 20, and making it inconvenient to install the permanent magnet 20; and when the ratio W2 / T between the width of the support boss 114 and the radial dimension of the support boss 114 on the annular magnetic sheet 111 is too large, the radial dimension of the support boss 114 on the annular magnetic sheet 111 is smaller, and the support boss 114 cannot effectively support the permanent magnet 20, causing the permanent magnet 20 to shake in the accommodating groove 11c, thereby affecting the installation reliability of the permanent magnet 20. Therefore, by controlling the ratio W2 / T between the width of the support boss 114 and the radial dimension of the support boss 114 on the annular magnetic sheet 111 to be between 0.25 and 0.85, the support boss 114 can effectively support the permanent magnet 20 while facilitating the installation of the permanent magnet 20.

[0100] As some exemplary examples, the ratio W2 / T between the width of the support boss 114 and the radial dimension of the support boss 114 on the annular magnetic sheet 111 can be 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, etc.

[0101] Optionally, see Figures 5 to 10 In one embodiment of the utility model, protrusions 1121 are provided on both sides of the sector-shaped piece 112 , the protrusions 1121 are arranged away from the annular magnetic piece 111 , and a magnetic isolation opening 1122 is formed between two opposite protrusions 1121 in two adjacent sector-shaped pieces 112 .

[0102] With such arrangement, when the permanent magnet 20 is installed in the accommodating groove 11c, the setting of the protrusion 1121 can limit the end of the permanent magnet 20 away from the supporting boss 114, so that the permanent magnet 20 can be positioned, supported and fixed by the supporting boss 114, the protrusion 1121 and the accommodating groove 11c, which can further improve the installation reliability of the permanent magnet 20.

[0103] In addition, by forming a magnetic isolation opening 1122 between two relative protrusions 1121 in two adjacent fan-shaped pieces 112, the setting of the magnetic isolation opening 1122 can also prevent the rotor core 10 from forming a magnetic circuit itself, so that the magnetic wave of the rotor core 10 is smaller and the magnetic field intensity is higher, thereby effectively reducing the leakage magnetic flux of the rotor core 10, thereby improving the utilization rate of the permanent magnet 20, and further improving the operating efficiency of the motor 1000.

[0104] Optionally, see Figures 8 to 10 In one embodiment of the present invention, the radial dimension of the protrusion 1121 in the annular magnetic sheet 111 is defined as T1, which satisfies: 0.3 mm ≤ T1 ≤ 5 mm.

[0105] In this way, when the dimension T1 of the protrusion 1121 in the radial direction of the annular magnetic sheet 111 is too small, the protrusion 1121 will be easily deformed, which will affect the reliability of the position limiting of the permanent magnet 20; and when the dimension T1 of the protrusion 1121 in the radial direction of the annular magnetic sheet 111 is too large, the protrusion 1121 will cause excessive compression of the permanent magnet 20, and it will be inconvenient to install the permanent magnet 20. Therefore, by controlling the dimension T1 of the protrusion 1121 in the radial direction of the annular magnetic sheet 111 to be between 0.3mm and 5mm, it can ensure that the protrusion 1121 effectively limits the permanent magnet 20 and facilitate the installation of the permanent magnet 20.

[0106] As some exemplary examples, the dimension T1 of the protrusion 1121 in the radial direction of the annular magnetic sheet 111 can be 0.3 mm, 0.8 mm, 1 mm, 1.2 mm, 1.7 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0107] Optionally, see Figures 5 to 10In one embodiment of the utility model, the annular magnetic sheet 111 of some rotor punching sheets 11 is a large-hole annular magnetic sheet 111a, and the annular magnetic sheet 111 of some rotor punching sheets 11 is a small-hole annular magnetic sheet 111b. The inner diameter of the large-hole annular magnetic sheet 111a is larger than the inner diameter of the small-hole annular magnetic sheet 111b, and the large-hole annular magnetic sheet 111a is used to fit with the crankcase clearance, and the small-hole annular magnetic sheet 111b is used to fit with the crankshaft interference.

[0108] By configuring in this way, the annular magnetic sheets 111 of some rotor sheets 11 are large-hole annular magnetic sheets 111a, and the annular magnetic sheets 111 of some rotor sheets 11 are small-hole annular magnetic sheets 111b. The large-hole annular magnetic sheets 111a can be used to fit with the crankcase clearance to avoid wear caused by contact between the annular magnetic sheets 111 and the crankcase during the rotation of the rotor core 10. At the same time, the small-hole annular magnetic sheets 111b can be used to have an interference fit with the crankshaft, so that the crankshaft can be driven to work smoothly under the rotation of the rotor core 10.

[0109] As some exemplary embodiments, the annular magnetic sheets 111 of the front half of the rotor cores 10 among the multiple rotor cores 10 can be large-hole annular magnetic sheets 111a, and the annular magnetic sheets 111 of the rear half of the rotor cores 10 among the multiple rotor cores 10 can be small-hole annular magnetic sheets 111b.

[0110] In actual application, the number of large-hole annular magnetic sheets 111 a and small-hole annular magnetic sheets 111 b may be the same or different, depending on actual use conditions and is not specifically limited here.

[0111] Optionally, see Figures 5 to 7 In one embodiment of the utility model, the inner diameter and outer diameter of the large-hole annular magnetic sheet 111a are defined as D1 and D2 respectively, which satisfies: 0.3mm≤(D2-D1) / 2≤5mm, that is, the thickness of the large-hole annular magnetic sheet 111a in its radial direction is 0.3mm~5mm.

[0112] In this way, when the thickness (D2-D1) / 2 of the large-hole ring magnetic sheet 111a in the radial direction is too small, the strength of the large-hole ring magnetic sheet 111a itself will be insufficient, and it will be easy to deform or even break during operation; and when the thickness (D2-D1) / 2 of the large-hole ring magnetic sheet 111a in the radial direction is too large, the gap between the large-hole ring magnetic sheet 111a and the crankcase will be too small, and contact and wear will occur during operation. Therefore, by controlling the thickness (D2-D1) / 2 of the large-hole ring magnetic sheet 111a in the radial direction to between 0.3mm and 5mm, it is possible to effectively avoid wear between the large-hole ring magnetic sheet 111a and the crankcase while ensuring the strength of the large-hole ring magnetic sheet 111a itself.

[0113] As some examples, the thickness (D2-D1) / 2 of the large-hole ring magnetic sheet 111a in its radial direction can be 0.3mm, 0.8mm, 1mm, 1.2mm, 1.7mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0114] Optionally, see Figure 1 , Figure 2 In one embodiment of the present invention, the sector-shaped piece 112 is provided with a locking hole 1123 , and the plurality of sector-shaped pieces 112 stacked in sequence cooperate with the locking hole 1123 through a locking member 1124 .

[0115] With such arrangement, the multiple stacked sector pieces 112 can be connected together by the locking attachment 1124 passing through the locking holes 1123 on the multiple stacked sector pieces 112 in sequence, and then the multiple rotor punchings 11 can be connected together to ensure the installation reliability of the rotor core 10.

[0116] As some exemplary embodiments, the locking attachment 1124 may be a rivet.

[0117] As some examples, in order to improve the installation reliability between multiple rotor punchings 11, end covers 12 can be respectively provided on the outer sides of the two outermost rotor punchings 11, and locking holes 1123 are also provided on the end covers 12. The locking accessory 1124 can be used to pass through the locking hole 1123 on the first end cover 12 and then through the locking holes 1123 on multiple fan-shaped sheets 112 in sequence, and finally through the locking hole 1123 on the second end cover 12, so that the multiple rotor punchings 11 can be effectively compressed through the two end covers 12.

[0118] See also Fig.11 The utility model also proposes a rotor structure 100, which includes a permanent magnet 20 and a rotor core 10. The specific structure of the rotor core 10 refers to the above embodiment. Since the rotor structure 100 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 permanent magnet 20 is arranged in the receiving groove 11c of the rotor core 10.

[0119] In this embodiment, when the permanent magnet 20 is installed in the receiving groove 11c, the N pole and S pole of the permanent magnet 20 are respectively fitted with the side surfaces on the two adjacent sector-shaped portions 11b, and the polarities of the opposite faces on the adjacent permanent magnets 20 are the same, that is, they are both S poles or N poles, so that the sector-shaped portion 11b clamped by the two adjacent permanent magnets 20 correspondingly exhibits S or N magnetic polarity, and the two adjacent sector-shaped portions 11b exhibit opposite magnetic polarity. Optionally, the rotor core 10 includes an even number of sector-shaped portions 11b, and the even number of sector-shaped portions 11b alternately exhibit opposite S pole and N pole magnetic polarity in the circumferential direction, and form a closed magnetic circuit. In addition, in order to make the magnetic circuit evenly distributed, a plurality of receiving grooves 11c are evenly distributed along the circumference of the collar portion 11a.

[0120] As some exemplary embodiments, the permanent magnet 20 may be a magnet.

[0121] Optionally, see Fig.12 In one embodiment of the present invention, the width of the permanent magnet 20 in the tangential direction of the rotor core 10 is defined as W, and the height of the permanent magnet 20 in the radial direction of the rotor core 10 is defined as H, then: 0.2≤W / H≤1.5 is satisfied.

[0122] In this configuration, when the ratio W / H between the width of the permanent magnet 20 in the tangential direction of the rotor core 10 and the height of the permanent magnet 20 in the radial direction of the rotor core 10 is too small, the magnetic field strength of the permanent magnet 20 is insufficient, and magnetic leakage is likely to occur; and when the ratio W / H between the width of the permanent magnet 20 in the tangential direction of the rotor core 10 and the height of the permanent magnet 20 in the radial direction of the rotor core 10 is too large, the internal resistance of the permanent magnet 20 itself is relatively strong, which also affects the magnetic field strength of the permanent magnet 20. Therefore, by controlling the ratio W / H between the width of the permanent magnet 20 in the tangential direction of the rotor core 10 and the height of the permanent magnet 20 in the radial direction of the rotor core 10 to be between 0.2 and 1.5, the magnetic field strength of the permanent magnet 20 can be guaranteed to reduce the copper loss of the motor 1000 during operation.

[0123] As some examples, the ratio W / H of the width of the permanent magnet 20 in the tangential direction of the rotor core 10 to the height of the permanent magnet 20 in the radial direction of the rotor core 10 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, etc.

[0124] Optionally, see Fig.11 In one embodiment of the present invention, the width of the magnetic isolation opening 1122 of the rotor core 10 in the tangential direction of the rotor core 10 is defined as C, and the following is satisfied: 0.3≤C / W≤0.8.

[0125] With such an arrangement, when the ratio C / W between the width of the magnetic isolation opening 1122 of the rotor core 10 in the tangential direction of the rotor core 10 and the width of the permanent magnet 20 in the tangential direction of the rotor core 10 is too small, the width of the magnetic isolation opening 1122 will be too small, and the rotor core 10 itself will not be able to effectively block the magnetic circuit, thereby causing magnetic leakage in the rotor core 10; and when the ratio C / W between the width of the magnetic isolation opening 1122 of the rotor core 10 in the tangential direction of the rotor core 10 and the width of the permanent magnet 20 in the tangential direction of the rotor core 10 is too large, the width of the magnetic isolation opening 1122 will be too large, resulting in the protruding length of the protrusion 1121 being too small, resulting in the protrusion 1121 being unable to effectively limit the permanent magnet 20, thereby affecting the installation reliability of the permanent magnet 20. Therefore, by controlling the ratio C / W between the width of the magnetic isolation opening 1122 of the rotor core 10 in the tangential direction of the rotor core 10 and the width of the permanent magnet 20 in the tangential direction of the rotor core 10 to be between 0.3 and 0.8, the reliability of the protrusion 1121 in limiting the permanent magnet 20 can be guaranteed while effectively blocking the rotor core 10 itself from forming a magnetic circuit.

[0126] As some examples, the ratio of the width of the magnetic isolation opening 1122 of the rotor core 10 in the tangential direction of the rotor core 10 to the width of the permanent magnet 20 in the tangential direction of the rotor core 10 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0127] Optionally, see Fig.11 In one embodiment of the present invention, a magnetic isolation hole 30 is formed between the permanent magnet 20 and the sector portion 11 b , the collar portion 11 a and the supporting boss 114 .

[0128] In this way, the setting of the magnetic isolation hole 30 can also prevent the rotor core 10 from forming a magnetic circuit, so that the magnetic wave of the rotor core 10 is smaller and the magnetic field strength is higher, thereby effectively reducing the leakage magnetic flux of the rotor core 10, thereby improving the utilization rate of the permanent magnet 20, and further improving the operating efficiency of the motor 1000.

[0129] See also Fig.13 The utility model also provides a motor 1000, which includes a stator structure 200 and a rotor structure 100. The specific structure of the rotor structure 100 refers to the above embodiment. Since the motor 1000 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 stator structure 200 is sleeved on the rotor structure 100.

[0130] In actual application, the motor 1000 proposed by the utility model can be applied to equipment such as refrigerators, air conditioners, washing machines, and sweeping robots.

[0131] The utility model also provides a refrigerator, which includes a motor 1000. The specific structure of the motor 1000 refers to the above embodiments. Since the refrigerator adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0132] As some exemplary embodiments, the motor 1000 may be applied to a compressor of a refrigerator to drive the compressor to operate.

[0133] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rotor core, characterized in that: include: A plurality of rotor punchings are stacked in sequence, the rotor punchings comprising an annular magnetic sheet and a plurality of sector-shaped sheets spaced around the annular magnetic sheet, the plurality of annular magnetic sheets are stacked to form a shaft collar portion, the plurality of sector-shaped sheets are stacked to form a sector-shaped portion, and a receiving groove is formed between two adjacent sector-shaped portions; Wherein, in the same rotor punching, some of the sector-shaped sheets are connected to the annular magnetic sheets by connecting keys, and some of the sector-shaped sheets are disconnected from the annular magnetic sheets; or, the sector-shaped sheets of some of the rotor punchings are connected to the annular magnetic sheets by connecting keys, and the sector-shaped sheets of some of the rotor punchings are disconnected from the annular magnetic sheets; The annular magnetic sheet is provided with a supporting boss corresponding to the accommodating groove, the supporting boss is used to support the permanent magnet, and the width W1 of the connecting key is less than or equal to the width W2 of the supporting boss.

2. The rotor core according to claim 1, characterized in that: The rotor core comprises a first punching sheet group and a second punching sheet group which are stacked, and the first punching sheet group and the second punching sheet group both comprise a plurality of rotor punching sheets which are stacked in sequence; The sector-shaped sheets in the first punching sheet group are connected to the annular magnetic sheets, and the sector-shaped sheets in the second punching sheet group are disconnected from the annular magnetic sheets; Alternatively, the fan-shaped sheets in the first punching sheet group are connected to and disconnected from the annular magnetic sheets and are arranged alternately, and the fan-shaped sheets in the second punching sheet group are connected to and disconnected from the annular magnetic sheets and are arranged alternately; the fan-shaped sheets in the first punching sheet group that are connected to the annular magnetic sheets and the fan-shaped sheets in the second punching sheet group that are disconnected from the annular magnetic sheets are arranged in a stacked manner.

3. The rotor core according to claim 2, characterized in that: The height of the rotor core is defined as L, and the height of the first punching sheet group is 0.1L-0.9L.

4. The rotor core according to claim 1, characterized in that: The rotor core comprises a plurality of first punching sheet groups and a plurality of second punching sheet groups, the plurality of first punching sheet groups and the plurality of second punching sheet groups are alternately stacked, and the first punching sheet group and the second punching sheet group both comprise a plurality of rotor punching sheets stacked in sequence; The sector-shaped sheets in the first punching sheet group are connected and disconnected with the annular magnetic sheets and are arranged alternately, and the sector-shaped sheets in the second punching sheet group are connected and disconnected with the annular magnetic sheets and are arranged alternately; In the adjacent first punching sheet group and the second punching sheet group, the sector-shaped sheets connected to the annular magnetic sheets in the first punching sheet group and the sector-shaped sheets disconnected from the annular magnetic sheets in the second punching sheet group are stacked.

5. The rotor core according to claim 4, characterized in that: The height of the rotor core is defined as L, and the height of the first punching sheet group and the second punching sheet group is 0.1L-0.2L.

6. The rotor core according to any one of claims 1 to 5, characterized in that: The connection key and the support boss satisfy: 0.1≤W1 / W2≤1; And / or, the width W2 of the supporting boss satisfies: 0.3 mm ≤ W2 ≤ 4 mm; And / or, the dimension of the supporting boss in the radial direction of the annular magnetic sheet is defined as T, then the following is satisfied: 0.25≤W2 / T≤0.

85.

7. The rotor core according to any one of claims 1 to 5, characterized in that: Both sides of the sector-shaped piece are provided with protrusions, the protrusions are arranged away from the annular magnetic piece, and a magnetic isolation opening is formed between two opposite protrusions in two adjacent sector-shaped pieces.

8. The rotor core according to claim 7, characterized in that: The dimension of the protrusion in the radial direction of the annular magnetic sheet is defined as T1, which satisfies: 0.3 mm ≤ T1 ≤ 5 mm.

9. The rotor core according to any one of claims 1 to 5, characterized in that: The annular magnetic sheets of some of the rotor punchings are large-hole annular magnetic sheets, and the annular magnetic sheets of some of the rotor punchings are small-hole annular magnetic sheets. The inner diameter of the large-hole annular magnetic sheets is larger than the inner diameter of the small-hole annular magnetic sheets, and the large-hole annular magnetic sheets are used to fit with the crankcase in a clearance, and the small-hole annular magnetic sheets are used to fit with the crankshaft in an interference fit.

10. The rotor core according to claim 9, characterized in that: The inner diameter and outer diameter of the large-hole ring magnetic sheet are defined as D1 and D2 respectively, which satisfies: 0.3mm≤(D2-D1) / 2≤5mm.

11. The rotor core according to any one of claims 1 to 5, characterized in that: The fan-shaped piece is provided with a locking hole, and the plurality of fan-shaped pieces stacked in sequence are matched with the locking hole through a locking member.

12. A rotor structure, characterized in that: include: The rotor core according to any one of claims 1 to 11; The permanent magnet is arranged in the receiving groove of the rotor core.

13. The rotor structure according to claim 12, characterized in that: The width of the permanent magnet in the tangential direction of the rotor core is defined as W, and the height of the permanent magnet in the radial direction of the rotor core is defined as H, and then: 0.2≤W / H≤1.5 is satisfied.

14. The rotor structure according to claim 13, characterized in that: The width of the magnetic isolation opening of the rotor core in the tangential direction of the rotor core is defined as C, which satisfies: 0.3≤C / W≤0.

8.

15. The rotor structure according to claim 12, characterized in that: A magnetic isolation hole is formed between the permanent magnet, the fan-shaped portion, the shaft ring portion and the supporting boss.

16. A motor, characterized in that: include: A rotor structure according to any one of claims 12 to 15; The stator structure is sleeved on the rotor structure.

17. A refrigerator, characterized in that: Comprising the motor as claimed in claim 16.

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