Rotor, motor, compressor and refrigeration equipment

Abstract

The utility model discloses a rotor, a motor, a compressor and refrigeration equipment, and relates to the technical field of motors, the rotor comprises a rotor iron core, and the rotor iron core at least comprises a first rotor punching sheet, a second rotor punching sheet and a third rotor punching sheet which are laminated along the axial direction of the rotor iron core; the number of the first rotor punching sheets is multiple, the two ends of the rotor iron core are each provided with at least one first rotor punching sheet, and the second rotor punching sheet and the third rotor punching sheet are located between the two first rotor punching sheets arranged at the two ends of the rotor iron core respectively. The rotor iron core is provided with air slots located between two adjacent magnetic steel slots, and the air slots comprise a plurality of first air slots arranged on the first rotor punching sheet, a plurality of second air slots arranged on the second rotor punching sheet, and a plurality of third air slots arranged on the third rotor punching sheet; in the axial direction of the rotor core, the plurality of second air slots and the plurality of third air slots are at least partially staggered and are in one-to-one correspondence with the first air slots; according to the technical scheme provided by the utility model, high-frequency noise of the motor can be reduced.

Description

Technical Field

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

[0002] The motor is the core part of the compressor, and its performance directly affects the operating efficiency and service life of the compressor. In the prior art, the high-frequency harmonic noise of the motor is mainly reduced by improving the design and materials of the motor. However, for the high power density and high speed requirements of the motor, the high-frequency harmonic noise of the motor is still relatively large, that is, the high-frequency radial electromagnetic force generated by the high-speed operation of the motor is easy to resonate with the structure, resulting in limited reduction effect, thus affecting the user experience and causing noise pollution to the environment. Utility Model Content

[0003] The main purpose of the utility model is to provide a rotor, a motor, a compressor and a refrigeration device, aiming at reducing the high-frequency noise of the motor.

[0004] In order to achieve the above-mentioned purpose, the rotor proposed by the utility model comprises:

[0005] A rotor core having a plurality of magnetic steel slots distributed along its circumference, wherein the rotor core comprises at least a first rotor punching sheet, a second rotor punching sheet and a third rotor punching sheet stacked along the axial direction of the rotor core;

[0006] There are a plurality of first rotor punchings, at least one first rotor punching is respectively provided at both ends of the rotor core, and the second rotor punching and the third rotor punching are located between the two first rotor punchings respectively provided at the two ends of the rotor core;

[0007] The rotor core is provided with air slots located between two adjacent magnetic steel slots, and the air slots include a plurality of first air slots provided on the first rotor punching, a plurality of second air slots provided on the second rotor punching, and a plurality of third air slots provided on the third rotor punching;

[0008] In the axial direction of the rotor core, the plurality of second air slots and the plurality of third air slots are at least partially staggered and correspond one-to-one to the first air slots.

[0009] In one embodiment, the number of the first rotor punchings is 2Q1, the number of the second rotor punchings is Q2, and 0.25≤Q2 / Q1≤4.

[0010] In one embodiment, the number of the third rotor punching sheets is Q3, and Q2=Q3.

[0011] In one embodiment, the second rotor punching sheet and the third rotor punching sheet are both provided in plurality and arranged between two first rotor punching sheets provided at two ends of the rotor core;

[0012] Each of the second rotor punchings and each of the third rotor punchings are stacked in two groups;

[0013] Alternatively, the second rotor punching sheets and the third rotor punching sheets are alternately stacked.

[0014] In one embodiment, the rotor core further comprises a punching sheet assembly and the first rotor punching sheet disposed at the end of the punching sheet assembly;

[0015] The punching plate combination includes the first rotor punching plates, the second rotor punching plates and the third rotor punching plates which are stacked, and the number of the first rotor punching plates located at the end of the punching plate combination is equal to the number of the first rotor punching plates located in the punching plate combination.

[0016] In one embodiment, in the punching sheet assembly, one of each of the first rotor punching sheet, the second rotor punching sheet, and the third rotor punching sheet is provided.

[0017] In one embodiment, in the punching sheet assembly, a plurality of the first rotor punching sheets, the second rotor punching sheets, and the third rotor punching sheets are provided.

[0018] In one embodiment, the punching sheet assembly is provided in multiple groups.

[0019] In one embodiment, the number of pole pairs of the rotor is P, the number of the first air slots is N1, the number of the second air slots is N2, the number of the third air slots is N3, N1≤N2+N3, and N1=2P.

[0020] In one embodiment, N2=N3;

[0021] N2=P; or, N2=4P / 3.

[0022] In one embodiment, the minimum distance from the air slot to the outer periphery of the rotor core is d1, and 0.35 mm≤d1≤0.5 mm.

[0023] In one embodiment, the minimum distance from the air slot to the adjacent magnetic steel slot is d2, 0.5×d1≤d2≤1.5×d1.

[0024] In one embodiment, in the radial direction of the rotor core, the radius D1 of the rotor core, the minimum distance D2 from the magnetic steel slot to the axis of the rotor core, and the difference d3 between the minimum distance from the air slot to the axis of the rotor core and D2 satisfy: (D1-D2)×0.5≤d3<(D1-D2)×0.9.

[0025] In one embodiment, the minimum distance from the air slot to the outer periphery of the rotor core is d1, and also satisfies: (D1-d1-D2)×0.6≤d3≤(D1-d1-D2)×0.9.

[0026] In one embodiment, the magnetic steel slot includes two inclined slot sections arranged at an angle, and the inclined slot sections of two adjacent magnetic steel slots are arranged to be gradually reduced in a direction close to the outer periphery of the rotor core.

[0027] In one embodiment, the minimum distance and angle between the inclined groove sections of two adjacent magnetic steel grooves are L and θ respectively, and the area S of the air groove satisfies: 0.25×π×(D1-d1-D2-d3)^2≤S≤L×(D1-d1-D2-d3)+tan(0.5×θ)×(D1-d1-D2-d3)^2.

[0028] The utility model also provides a motor, which comprises the rotor as described above.

[0029] The utility model also provides a compressor, which comprises the motor as described above.

[0030] The utility model also provides a refrigeration device, which includes the refrigeration device as described above.

[0031] In the technical solution of the utility model, the rotor core includes a first rotor punching, a second rotor punching and a third rotor punching. The second rotor punching and the third rotor punching are arranged between the two first rotor punchings located at the two ends of the rotor core. The second air slots and the third air slots are staggered, and the second air slots and the third air slots are arranged one-to-one with the first air slots. The sum of the harmonics introduced on the second rotor punching and the third rotor punching can be offset by the harmonics introduced on the first rotor punching, thereby effectively reducing the high-frequency harmonic magnetic field and the radial electromagnetic force generated by it, greatly reducing the influence of the high-frequency harmonic magnetic field on the harmonic electromagnetic force, thereby reducing the high-frequency noise of the motor and even the compressor, improving the user's comfort, and reducing noise pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 A schematic structural diagram of a rotor embodiment provided by the utility model;

[0034] Figure 2 A schematic structural diagram of another embodiment of a rotor provided by the utility model;

[0035] Figure 3 A schematic structural diagram of an embodiment of a first rotor punching sheet provided by the utility model;

[0036] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0037] Figure 5 A schematic structural diagram of an embodiment of a second rotor punching sheet provided by the utility model;

[0038] Figure 6 A schematic structural diagram of another embodiment of the second rotor punching provided by the utility model;

[0039] Figure 7 A schematic structural diagram of an embodiment of a third rotor punching sheet provided by the utility model;

[0040] Figure 8 A schematic structural diagram of another embodiment of the third rotor punching provided by the utility model;

[0041] Fig. 9 This is a schematic structural diagram of another embodiment of the third rotor punching provided by the utility model.

[0042] Description of Figure Numbers:

[0043] 100, rotor core; 11, first rotor punching sheet; 111, first air slot; 12, second rotor punching sheet; 121, second air slot; 13, third rotor punching sheet; 131, third air slot; 14, magnetic steel slot; 141, skewed slot section; 15, flow hole; 16, rivet hole; 17, punching sheet assembly.

[0044] 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

[0045] 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.

[0046] 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.

[0047] 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.

[0048] Refrigeration equipment is one of the indispensable equipment in modern life, such as air conditioners and refrigerators, and one of its core components is the compressor. Among them, the motor is the core driving part of the compressor, and its efficiency directly affects the performance and energy consumption of the compressor. Therefore, improving the efficiency of the motor is an important way to improve the performance of the compressor. In the field of motor technology, the design of the rotor structure is a key factor affecting the efficiency of the motor. In the prior art, the high-frequency harmonic noise of the motor is mainly reduced by improving the design and materials of the motor. However, for the high power density and high speed requirements of the motor, the high-frequency harmonic noise of the motor is still large, that is, the high-frequency radial electromagnetic force generated by the high-speed operation of the motor is easy to resonate with the structure, resulting in obvious electromagnetic noise problems, which limits the overall noise reduction effect, and thus seriously affects the user experience and causes noise pollution to the environment.

[0049] In order to solve this technical problem, the utility model provides a rotor.

[0050] See also Figures 1 to 9In one embodiment of the utility model, the rotor includes a rotor core 100, and the rotor core 100 has a plurality of magnetic steel slots 14 distributed along its circumferential direction. The rotor core 100 at least includes a first rotor punching 11, a second rotor punching 12, and a third rotor punching 13 stacked along the axial direction of the rotor core 100; a plurality of the first rotor punchings 11 are provided, and at least one of the first rotor punchings 11 is provided at each end of the rotor core 100, and the second rotor punching 12 and the third rotor punching 13 are located at the two first rotor punchings provided at the two ends of the rotor core 100. The rotor core 100 is provided with an air slot located between two adjacent magnetic steel slots 14, and the air slot includes a plurality of first air slots 111 provided on the first rotor punching 11, a plurality of second air slots 121 provided on the second rotor punching 12, and a plurality of third air slots 131 provided on the third rotor punching 13; in the axial direction of the rotor core 100, the plurality of second air slots 121 and the plurality of third air slots 131 are at least partially staggered, and correspond one to one to each of the first air slots 111; thereby reducing the high-frequency noise of the motor or compressor.

[0051] In the technical solution of the utility model, the rotor core 100 includes a first rotor punching 11, a second rotor punching 12 and a third rotor punching 13. The second rotor punching 12 and the third rotor punching 13 are arranged between the two first rotor punchings 11 located at both ends of the rotor core 100. With the staggered arrangement of the second air slots 121 and the third air slots 131, and the one-to-one correspondence between each second air slot 121 and each third air slot 131 and each first air slot 111, the sum of the harmonics introduced on the second rotor punching 12 and the third rotor punching 13 can be offset by the harmonics introduced on the first rotor punching 11, thereby effectively reducing the high-frequency harmonic magnetic field and the radial electromagnetic force generated by it, greatly reducing the influence of the high-frequency harmonic magnetic field on the harmonic electromagnetic force, thereby reducing the high-frequency noise of the motor and even the compressor, improving the user's comfort, and reducing noise pollution to the environment.

[0052] Specifically, the magnetic steel slots 14 penetrate the first rotor sheet 11, the second rotor sheet 12 and the third rotor sheet 13 along the axial direction of the rotor core 100, and are used to fix the magnetic steel in the rotor core 100; the air slots arranged between two adjacent magnetic steel slots 14 can be used to adjust the direction of the magnetic lines of force on the first rotor sheet 11, the second rotor sheet 12 and the third rotor sheet 13. While ensuring that more stator magnetic lines of force are reliably introduced into the rotor core 100, the harmonic magnetic field is blocked at the setting position of the air slots, so that the magnetic field at this position is in a saturated state, the magnetic resistance is increased, the leakage magnetic flux is reduced, and it is helpful to suppress the magnetic field distortion and weaken the harmonics, and reduce the generation of radial electromagnetic force. In addition, the first rotor sheets 11 are respectively arranged at both ends of the rotor core 100, which also helps to reduce the leakage magnetic flux, thereby improving the magnetic concentration and anti-demagnetization capabilities of the rotor, reducing the torque pulsation of the motor, and improving the high-frequency noise of the motor.

[0053] Among them, a first air slot 111 is provided between each adjacent two magnetic steel slots 14 on the first rotor punching 11, and because at least part of the first rotor punching 11 is arranged at both ends of the rotor core 100, the magnetic resistance between the adjacent two magnetic steels is increased, which is convenient for guiding the magnetic lines of force to pass through the narrow stator-rotor air gap, decouple the stator-rotor windings, form an effective magnetic flux, and help reduce magnetic leakage and power loss; while the second air slot 121 and the third air slot 131 are not provided between at least part of the adjacent two magnetic steel slots 14 on the second rotor punching 12 and the third rotor punching 13, in order to prepare for offsetting the harmonics introduced on the first rotor punching 11. The first air slot 111, the second air slot 121 and the third air slot 131 have the same features such as shape and size, and their cross-sectional shapes can be waist-shaped, trapezoidal, square, etc.

[0054] Optionally, in an embodiment of the present invention, the number of the first rotor punching sheets 11 is 2Q1, the number of the second rotor punching sheets 12 is Q2, 0.25≤Q2 / Q1≤4, it can be understood that in order to avoid magnetic leakage of the rotor, at least one first rotor punching sheet 11 is respectively provided at both ends of the rotor core 100, therefore, compared with the second rotor punching sheets 12 and the third rotor punching sheets 13, the number of the first rotor punching sheets 11 is twice Q1;

[0055] Since the second air slot 121 and the third air slot 131 are at least partially staggered and arranged corresponding to the first air slot 111, that is, the sum of the number of the second air slot 121 and the third air slot 131 is at least equal to the total number of the first air slot 111, by limiting 0.25≤Q2 / Q1≤4, the noise reduction effect of the rotor is guaranteed; specifically, the number of the third rotor punchings 13 is Q3, taking Q2=Q3 as an example, when the ratio of Q2 / Q1 is too small, it is easy to cause noise problems due to incomplete cancellation of harmonics, thereby affecting the user's comfort and causing noise pollution to the environment. When the ratio of Q2 / Q1 is too large, it is easy to increase the overall weight and thickness of the rotor due to the excessive number of punchings, affecting the torque of the motor. Of course, in other embodiments, the number of the second rotor punchings 12 and the third rotor punchings 13 are not equal.

[0056] Optionally, the second rotor punching sheet 12 and the third rotor punching sheet 13 are both provided in plurality and arranged between the two first rotor punching sheets 11 provided at both ends of the rotor core 100, and the first rotor punching sheet 11 is also provided in plurality and arranged in multiples;

[0057] Among them, Figure 1 As shown, in the embodiment of the present utility model, each of the second rotor punching sheets 12 and each of the third rotor punching sheets 13 are stacked in two groups, that is, in the axial direction of the rotor core 100, each of the first rotor punching sheets 11 is stacked in sequence to form two groups of first rotor punching sheet groups arranged at intervals, each of the second rotor punching sheets 12 is stacked in sequence to form a group of second rotor punching sheet groups, and each of the third rotor punching sheets 13 is stacked in sequence to form a group of third rotor punching sheet groups, and then, the grouped second rotor punching sheet groups and the third rotor punching sheet groups are sequentially arranged between the two first rotor punching sheet groups to form the rotor core 100;

[0058] Alternatively, in another embodiment, each of the second rotor punching sheets 12 and each of the third rotor punching sheets 13 are alternately stacked, that is, in the axial direction of the rotor core 100, each of the first rotor punching sheets 11 are stacked in sequence to form two groups of first rotor punching sheets arranged at intervals, and each of the second rotor punching sheets 12 and each of the third rotor punching sheets 13 are alternately stacked in sequence to form a whole, and then, the whole is arranged between the two first rotor punching sheets to constitute the rotor core 100.

[0059] See also Figures 1 to 2 In an embodiment of the present utility model, the rotor core 100 further includes a punching sheet assembly 17 and the first rotor punching sheet 11 disposed at the end of the punching sheet assembly 17;

[0060] The punching sheet combination 17 includes the stacked first rotor punching sheets 11, the second rotor punching sheets 12 and the third rotor punching sheets 13, and the number of the first rotor punching sheets 11 located at the end of the punching sheet combination 17 is equal to the number of the first rotor punching sheets 11 located in the punching sheet combination 17, so as to ensure that the two first rotor cores 100 located at both ends of the rotor core 100 are symmetrically arranged, so as to improve the anti-demagnetization performance of the rotor; and the second rotor punching sheets 12 and the third rotor punching sheets 13 in the punching sheet combination 17 can be arranged arbitrarily.

[0061] The specific number of the punching sheet assemblies 17 mainly depends on the axial thickness of the rotor core 100 and the performance requirements of the motor, wherein the punching sheet assemblies 17 can be provided in one group or in multiple groups.

[0062] Specifically, in one embodiment, in the punching sheet assembly 17, each of the first rotor punching sheet 11, the second rotor punching sheet 12 and the third rotor punching sheet 13 is provided with one, so as to form a punching sheet assembly 17 with better noise reduction effect, which is convenient for the combined processing and assembly of the rotor core 100; when there are multiple punching sheet assemblies 17, each punching sheet assembly 17 is stacked in sequence along the axial direction of the rotor core 100, and a first rotor punching sheet 11 is provided at the end of the stacked punching sheet assembly 17 to avoid the consumption of leakage magnetic flux.

[0063] In another embodiment, in the punching sheet combination 17, the first rotor punching sheet 11, the second rotor punching sheet 12 and the third rotor punching sheet 13 are each provided in plurality. Similarly, a punching sheet combination 17 with better noise reduction effect can be formed, which is convenient for the combined processing and assembly of the rotor core 100. When there are multiple punching sheet combinations 17, each punching sheet combination 17 is stacked in sequence along the axial direction of the rotor core 100, and multiple first rotor punching sheets 11 are arranged at the end of the stacked punching sheet combination 17 assembly to avoid consumption of leakage magnetic flux, and at the same time, ensure that the first rotor punching sheet 11 at the end is symmetrically arranged with the first rotor punching sheet 11 at the head end of the first punching sheet combination 17.

[0064] In addition, the specific number of groups of the punching plate combination 17 is (the total number of punching plates-the number of the first rotor punching plates 11 at the end) / 3 groups.

[0065] See also Figures 3 to 9In the embodiment of the utility model, the number of pole pairs of the rotor is P, the number of the first air slots 111 is N1, the number of the second air slots 121 is N2, the number of the third air slots 131 is N3, N1≤N2+N3, and N1=2P, wherein, because N1=2P, a first air slot 111 is provided between each two adjacent magnetic steel slots 14 on the first rotor punching sheet 11, so as to improve the radial and axial magnetic leakage of the rotor core 100; and in order to achieve the purpose of offsetting the harmonics introduced by the first rotor punching sheet 11, the sum of the number of the second air slots 121 and the third air slots 131 must not be less than the number of the first air slots 111, so as to reduce the possibility of incomplete harmonic offset. The number of pole pairs P of the rotor is 3, 4, 5, 6, etc.

[0066] Specifically, Figure 5 and Figure 7 As shown, when N2=N3, and N1=N2+N3, the number of the second air slots 121 and the number of the third air slots 131 each account for half of the number of the first air slots 111. Taking the number of rotor pole pairs as 3 as an example, N2=N3=3, wherein the three second air slots 121 on the second rotor punching 12 are evenly spaced, and the positions of two adjacent second air slots 121 along the circumferential direction of the second rotor punching 12 are 360° / N2, that is, 120° apart from each other; similarly, the three third air slots 131 on the third rotor punching 13 are evenly spaced, and the positions of two adjacent third air slots 131 along the circumferential direction of the third rotor punching The circumferential difference of the punching sheets 13 is 360° / N2, that is, 120°; that is, symmetrical magnetic resistances are respectively provided on the second rotor punching sheet 12 and the third rotor punching sheet 13, which helps to weaken harmonics, reduce the radial electromagnetic force, and achieve noise reduction. At the same time, it reduces torque fluctuations and improves the operating stability of the motor; and, on the basis of ensuring noise reduction, due to the staggered second air slots 121 and the third air slots 131, the second air slots 121 located on the second rotor punching sheet 12 and the third air slots 131 located on the third rotor punching sheet 13 are 360° / N1, that is, 60°, circumferentially different in the rotor core 100.

[0067] Specifically, Figure 6 , Figure 7 and Fig. 9As shown, when N2=N3, and N1<N2+N3, since N2=N3=4P / 3, taking the number of rotor pole pairs as 3 as an example, N2=N3=4, that is, by respectively setting asymmetric magnetic resistance on the second rotor sheet 12 and the third rotor sheet 13, harmonics can be weakened to a certain extent, radial electromagnetic force can be reduced, and noise can be reduced. Due to the asymmetric setting, the second air slot 121 on the second rotor sheet 12 and the third air slot 131 on the third rotor sheet 13 are partially staggered, and the staggered second air slot 121 and the third air slot 131 are at least 360° / N1, that is, 60°, in the circumferential direction of the rotor core 100. Of course, in other embodiments, N2 and N3 are not equal.

[0068] See also Figure 4 In an embodiment of the present utility model, the minimum distance from the air slot to the outer periphery of the rotor core 100 is d1, 0.35mm≤d1≤0.5mm, so as to ensure the mechanical strength and anti-demagnetization ability of the rotor core 100.

[0069] Specifically, when the minimum distance d1 from the air slot to the outer periphery of the rotor core 100 is less than 0.35 mm, the structural stability of the rotor punching is easily affected, thereby reducing the mechanical strength of the rotor core 100 and affecting the safety of use and the service life of the motor; when the minimum distance d1 from the air slot to the outer periphery of the rotor core 100 is greater than 0.5 mm, the minimum distance from the air slot to the outer periphery of the rotor core 100 is too large, resulting in an increase in the overall width of the rotor core 100, and because the magnetic field at this position is not saturated, magnetic leakage is very likely to occur, and it is also easy to cause the size of the air slot to be too small, affecting the magnetic concentration and anti-demagnetization ability of the rotor. Therefore, limiting the minimum distance d1 from the air slot to the outer periphery of the rotor core 100 to between 0.35 mm and 0.5 mm can not only ensure the mechanical strength of the rotor core 100, but also the magnetic resistance effect of the air slot at this location, thereby ensuring the magnetic concentration and magnetic conduction effects of the motor and improving the operating power of the motor or compressor. Of course, in other embodiments, if the specifications of the rotor punching sheets are increased or decreased, the minimum distance from the air slot to the outer periphery of the rotor core 100 will also change synchronously.

[0070] Furthermore, in an embodiment of the present invention, the minimum distance from the air slot to the adjacent magnetic steel slot 14 is d2, 0.5×d1≤d2≤1.5×d1. It can be understood that the minimum distance d1 from the air slot to the outer periphery of the rotor core 100 and the minimum distance d2 from the air slot to the adjacent magnetic steel slot 14 change synchronously, so that the position of the air slot is adapted to the specifications of the rotor punching sheet, and the air slot can be arranged adjacent to the magnetic steel slot 14 to increase the magnetic resistance between the two adjacent magnetic steels, solve the magnetic leakage problem of the magnetic steel itself, and further help to further improve the anti-demagnetization ability of the rotor, thereby improving the efficiency of the motor or compressor. Of course, in other embodiments, the spacing between the air slot and the magnetic steel slot 14 and the spacing between the air slot and the periphery of the rotor core 100 can also be set independently of each other.

[0071] See also Figures 3 to 4 In the embodiment of the utility model, in the radial direction of the rotor core 100, the difference d3 between the radius D1 of the rotor core 100, the minimum distance D2 from the magnetic steel slot 14 to the axis of the rotor core 100, the minimum distance D3 from the air slot to the axis of the rotor core 100 and D2 satisfies: (D1-D2)×0.5≤d3<(D1-D2)×0.9. It can be understood that D1-D2 defines the radial length of the magnetic steel slot 14 from the side close to the rotation axis of the rotor core 100 to the outer periphery of the rotor core 100, and d3 is defined in the radial direction. The ratio of d3 to the length is between 0.6 and 0.9 to ensure that the position of the air slot is located adjacent to the outer periphery of the rotor core 100, thereby avoiding that the size of the air slot is too small due to d3 being too large, thereby affecting the harmonic suppression effect, and avoiding that the size of the air slot is too large due to d3 being too small, thereby reducing the influence of the air slot on the main magnetic circuit of the magnetic steel itself. Therefore, by limiting d3 to between (D1-D2)×0.5 and (D1-D2)×0.9, the magnetic flux effect of the motor is ensured, the influence on the torque is reduced, the efficiency of the motor or the compressor is guaranteed, and at the same time, the noise reduction effect of the motor is improved.

[0072] Of course, in other embodiments, when most of the air slots are arranged adjacent to the outer periphery of the rotor core 100, a small part of the air slots can also be arranged closer to the axis of the rotor core 100, or, when (D1-D2)×0.5≤d3<(D1-D2)×0.9 is satisfied, the air slots between two adjacent magnetic steel slots 14 can also be configured as multiple independent slots.

[0073] Furthermore, in an embodiment of the present invention, the minimum distance from the air slot to the outer periphery of the rotor core 100 is d1, and also satisfies: (D1-d1-D2)×0.6≤d3≤(D1-d1-D2)×0.9, further eliminating the influence of the minimum distance d1 from the air slot to the outer periphery of the rotor core 100 on the size of the air slot, so that the motor has better flux effect and noise reduction effect.

[0074] See also Figures 3 to 4 In an embodiment of the utility model, the magnetic steel slot 14 includes two inclined slot sections 141 arranged at an angle, and the inclined slot sections 141 of two adjacent magnetic steel slots 14 are gradually tapered in a direction close to the outer periphery of the rotor core 100, wherein the two inclined slot sections 141 on the same magnetic steel slot 14 are symmetrically arranged with respect to the radial direction of the rotor core 100, and an air slot is further arranged between the inclined slot sections 141 of two adjacent magnetic steel slots 14, such an arrangement helps to improve the magnetic flux of the rotor.

[0075] Further, in an embodiment of the present invention, the minimum distance and angle between the skewed slot sections 141 of two adjacent magnetic steel slots 14 are L and θ respectively, and the area S of the air slot satisfies: 0.25×π×(D1-d1-D2-d3)^2≤S≤L×(D1-d1-D2-d3)+tan(0.5×θ)×(D1-d1-D2-d3)^2. It can be understood that the minimum distance between the skewed slot sections 141 of two adjacent magnetic steel slots 14 in the circumferential direction of the rotor core 100 is L. , the minimum distance from the air slot to the outer periphery of the rotor core 100 is d1. Due to the inclined setting of the inclined slot section 141, the cross-sectional shape of the air slot is an isosceles trapezoid, wherein 0.25×π×(D1-d1-D2-d3)^2 represents the area of ​​a quarter circle with the radial size of the air slot in the rotor core 100 as the radius, and L×(D1-d1-D2-d3)+tan(0.5×θ)×(D1-d1-D2-d3)^2 represents the area of ​​the isosceles trapezoidal air slot shown in the figure.

[0076] It should be noted that, under the limiting condition of 0.5×d1≤d2≤1.5×d1, the area of ​​the sector formed with the radial size of the air slot in the rotor core 100 as the radius is the minimum area that the air slot can achieve; similarly, under the limiting condition of 0.5×d1≤d2≤1.5×d1, the two waist sides of the isosceles trapezoid are respectively parallel to the inclined slot section 141 in the adjacent magnetic steel slot 14. It can be seen that the area of ​​the isosceles trapezoid is the maximum area that the air slot can reach. Therefore, the area of ​​the air slot 1 is limited to be between the above-mentioned sector area and the above-mentioned trapezoidal area, so that under the limiting condition of 0.5×d1≤d2≤1.5×d1, the air slot can be formed into any shape, such as circular, square, and special shape, which can not only ensure the suppression effect of harmonics and improve the noise reduction effect of the motor, but also reduce the risk of the air slot blocking the main magnetic circuit of the magnetic steel itself, so as to ensure the magnetic flux of the motor and reduce the influence on the torque, thereby helping to improve the efficiency of the motor or compressor.

[0077] Of course, in other embodiments, when d1 and d2 are independently set, the area of ​​a single air slot may also be smaller than π×(D1-d1-D2-d3)^2.

[0078] The utility model also proposes a motor, which includes a rotor. The specific structure of the rotor refers to the above embodiments. Since the motor 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.

[0079] Among them, Figures 3 to 9 As shown, the first rotor punching sheet 11 , the second rotor punching sheet 12 and the third rotor punching hole are all provided with rivet holes 16 , so as to form the rotor core 100 by stacking through the rivet holes 16 , the magnet is installed in the magnet slot 14 , and the stator is fixed to the outer periphery of the rotor core 100 .

[0080] The utility model also proposes a compressor, which includes a 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 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.

[0081] The outer periphery of the stator is fixed to the compressor housing, and the refrigeration oil and refrigerant in the compressor are directly passed through the flow hole 15 of the rotor core 100 to achieve energy circulation; or, the outer periphery of the stator is fixed to the motor housing, and then the motor is installed in the compressor housing.

[0082] The utility model also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above embodiment. Since the refrigeration device 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 repeated here one by one.

[0083] 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, characterized in that: include: A rotor core having a plurality of magnetic steel slots distributed along its circumference, wherein the rotor core comprises at least a first rotor punching sheet, a second rotor punching sheet and a third rotor punching sheet stacked along the axial direction of the rotor core; There are a plurality of first rotor punchings, at least one first rotor punching is respectively provided at both ends of the rotor core, and the second rotor punching and the third rotor punching are located between the two first rotor punchings respectively provided at the two ends of the rotor core; The rotor core is provided with air slots located between two adjacent magnetic steel slots, and the air slots include a plurality of first air slots provided on the first rotor punching, a plurality of second air slots provided on the second rotor punching, and a plurality of third air slots provided on the third rotor punching; In the axial direction of the rotor core, the plurality of second air slots and the plurality of third air slots are at least partially staggered and correspond one-to-one to the first air slots.

2. The rotor according to claim 1, characterized in that The number of the first rotor punching sheets is 2Q1, the number of the second rotor punching sheets is Q2, and 0.25≤Q2 / Q1≤4.

3. The rotor according to claim 2, characterized in that The number of the third rotor punching sheets is Q3, Q2=Q3.

4. The rotor according to claim 2, characterized in that The second rotor punching sheet and the third rotor punching sheet are both provided in plurality and arranged between the two first rotor punching sheets provided at both ends of the rotor core; Each of the second rotor punchings and each of the third rotor punchings are stacked in two groups; Alternatively, the second rotor punching sheets and the third rotor punching sheets are alternately stacked.

5. The rotor according to claim 2, characterized in that The rotor core further comprises a punching sheet assembly and the first rotor punching sheet arranged at the end of the punching sheet assembly; The punching plate combination includes the first rotor punching plates, the second rotor punching plates and the third rotor punching plates which are stacked, and the number of the first rotor punching plates located at the end of the punching plate combination is equal to the number of the first rotor punching plates located in the punching plate combination.

6. The rotor according to claim 5, characterized in that In the punching sheet assembly, one of each of the first rotor punching sheet, the second rotor punching sheet and the third rotor punching sheet is provided.

7. The rotor according to claim 5, characterized in that In the punching sheet assembly, a plurality of the first rotor punching sheets, the second rotor punching sheets and the third rotor punching sheets are provided.

8. The rotor according to claim 6 or 7, characterized in that The punching sheet assembly is provided in multiple groups.

9. The rotor according to claim 2, characterized in that The number of pole pairs of the rotor is P, the number of the first air slots is N1, the number of the second air slots is N2, the number of the third air slots is N3, N1≤N2+N3, and N1=2P.

10. The rotor according to claim 9, characterized in that N2=N3; N2=P; or, N2=4P / 3.

11. The rotor according to claim 1, characterized in that The minimum distance from the air slot to the outer periphery of the rotor core is d1, 0.35mm≤d1≤0.5mm.

12. The rotor according to claim 11, characterized in that The minimum distance from the air slot to the adjacent magnetic steel slot is d2, 0.5×d1≤d2≤1.5×d1.

13. The rotor according to claim 1, characterized in that In the radial direction of the rotor core, the radius D1 of the rotor core, the minimum distance D2 from the magnetic steel slot to the axis of the rotor core, the difference d3 between the minimum distance from the air slot to the axis of the rotor core and D2 satisfy: (D1-D2)×0.5≤d3<(D1-D2)×0.

9.

14. The rotor according to claim 13, characterized in that The minimum distance from the air slot to the outer periphery of the rotor core is d1, and also satisfies: (D1-d1-D2)×0.6≤d3≤(D1-d1-D2)×0.

9.

15. The rotor according to claim 14, characterized in that The magnetic steel slot comprises two inclined slot sections arranged at an angle, and the inclined slot sections of two adjacent magnetic steel slots are arranged to be gradually reduced in a direction close to the outer periphery of the rotor core.

16. The rotor according to claim 15, characterized in that The minimum distance and angle between the inclined groove sections of two adjacent magnetic steel grooves are L and θ respectively, and the area S of the air groove satisfies: 0.25×π×(D1-d1-D2-d3)^2≤S≤L×(D1-d1-D2-d3)+tan(0.5×θ)×(D1-d1-D2-d3)^2.

17. A motor, characterized in that: Comprising a rotor as claimed in any one of claims 1 to 16.

18. A compressor, characterized in that: Comprising the motor as claimed in claim 17.

19. A refrigeration device, characterized in that: Comprising the refrigeration device as claimed in claim 18.

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