Rotor, motor and compressor

Abstract

The utility model discloses a rotor, a motor and a compressor, the rotor comprises a rotor iron core and magnetic steel, the rotor iron core comprises a plurality of rotor punching sheets, the plurality of rotor punching sheets are laminated to form magnetic steel grooves, and a plurality of magnetic steel grooves are distributed along the circumferential direction of the rotor punching sheets at intervals; a plurality of magnetic steels are arranged and are respectively arranged in the magnetic steel grooves; wherein the magnetic steel comprises a main body part, a first anti-demagnetization part and a second anti-demagnetization part which are respectively connected to two ends of the main body part in the length direction, a first transition part for connecting the main body part and the first anti-demagnetization part, and a second transition part for connecting the main body part and the second anti-demagnetization part, the width of the main body part is A, the width of the first anti-demagnetization part is B1, the width of the second anti-demagnetization part is B2, A is smaller than B1, and A is smaller than B2. According to the technical scheme of the utility model, by improving the magnetic steel structure, the usage amount of the magnetic steel is reduced, the cost is reduced, and the overall demagnetization resistance of the rotor is ensured.

Description

Technical Field

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

[0002] Magnets are an indispensable material for manufacturing permanent magnet motors. Magnets provide magnetic fields for permanent magnet motors. At the same time, magnets are also affected by the alternating magnetic fields generated by the energized coils in the permanent magnet motors. The alternating magnetic fields will cause large eddy current losses inside the magnets. The eddy current losses will cause the magnets to heat up and generate high temperatures, causing demagnetization and failure. Magnets will also demagnetize and fail due to corrosion or collision.

[0003] At present, the magnetic steel in permanent magnet motors mostly adopts "I" or "V" shaped blocks, which are relatively simple in shape. In order to improve the anti-demagnetization performance of the motor rotor, multiple magnetic steels with different anti-demagnetization performance are often combined, which increases the cost of the motor to a certain extent. Utility Model Content

[0004] The main purpose of the utility model is to provide a magnetic steel, aiming to reduce the usage of magnetic steel and reduce the cost by improving the magnetic steel structure, while ensuring the anti-demagnetization performance of the rotor as a whole.

[0005] In order to achieve the above-mentioned purpose, the magnetic steel proposed by the utility model includes:

[0006] The rotor core comprises a plurality of rotor punchings, wherein the plurality of rotor punchings are stacked and formed with magnetic steel slots, wherein a plurality of magnetic steel slots are arranged at intervals along the circumference of the rotor punchings;

[0007] A plurality of magnetic steels are provided and are respectively installed in the magnetic steel slots;

[0008] Wherein, the magnetic steel includes a main body, a first anti-demagnetization part and a second anti-demagnetization part respectively connected to the two ends of the main body in the length direction, a first transition part connecting the main body and the first anti-demagnetization part, and a second transition part connecting the main body and the second anti-demagnetization part. The width of the main body is A, the width of the first anti-demagnetization part is B1, the width of the second anti-demagnetization part is B2, and A<B1, A<B2.

[0009] Optionally, the length of the main body is C, the total length of the magnetic steel is D, the length of the first anti-demagnetization part is E, the length of the second anti-demagnetization part is F, C / D+E / F≤B / A, and 1.4≤B / A≤1.8, and the width B is any one of the width of the first anti-demagnetization part and the width of the second anti-demagnetization part.

[0010] Optionally, 0.6≤C / D≤0.8; and / or, 0.8≤E / F≤1.2.

[0011] Optionally, a first inclined surface is provided on the first transition portion, and a first inclination angle of the first inclined surface is J1; a second inclined surface is provided on the second transition portion, and a second inclination angle of the second inclined surface is J2;

[0012] 0.9≤J1 / J2≤1.1; and / or,

[0013] tan(J1)≤C / D+E / F≤B / A≤tan(K*J1), and 1.1≤K≤1.5.

[0014] Optionally, the magnetic steel is a ferrite magnetic steel.

[0015] Optionally, in the thickness direction of the magnetic steel, the end surface edge of the magnetic steel is provided with a chamfer.

[0016] Optionally, a gap W is provided between the magnetic steel and the magnetic steel slot, and 0.05mm≤W≤0.15mm.

[0017] Optionally, the rotor punching sheet comprises an inner ring portion and a plurality of sector-shaped portions distributed around the axis of the inner ring portion, and the magnetic steel slot is formed between two adjacent sector-shaped portions and the inner ring portion;

[0018] Among them, at least part of the groove side walls of the magnetic steel groove are provided with spring plates, the top of the spring plates extends into the magnetic steel groove, and the top of the spring plates abuts against the side walls of the magnetic steel to fix the magnetic steel.

[0019] Optionally, at least a portion of the fan-shaped portion is provided with a notch groove on the side wall facing the magnetic steel groove, and the spring sheet is provided in the notch groove, and the spring sheet extends from the bottom of the notch groove toward the groove opening.

[0020] Optionally, at least a portion of the fan-shaped portion is provided with an avoidance groove on the side wall facing the magnetic steel slot, and the avoidance groove corresponds to the notch groove on the rotor punching sheet adjacent in the axial direction.

[0021] Optionally, a plurality of the notch grooves and a plurality of the avoidance grooves are alternately arranged on a rotor punching sheet.

[0022] Optionally, the plurality of rotor punching sheets are alternately rotated by a mechanical angle θ for stacking, and θ=360° / P;

[0023] The number of the magnetic steel slots is P, P=12±k*2, k is 1 or 2.

[0024] Optionally, the spring sheet is provided on the outer periphery of the inner ring portion, and the spring sheet extends radially along the rotor punching sheet.

[0025] Optionally, at least part of the sector portion is connected to the inner ring portion.

[0026] Optionally, two adjacent sector portions are disconnected from one side of the inner ring portion.

[0027] Optionally, two adjacent sector portions are connected via a bridge at a side facing away from the inner ring portion.

[0028] Optionally, the rotor further includes an end plate, which is located in the axial direction of the rotor core, and the end plate and the rotor core are connected in series via fasteners.

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

[0030] The utility model also provides a compressor, which comprises the motor as described above.

[0031] In the technical solution of the utility model, the magnetic steel includes a main body and a first anti-demagnetization part and a second anti-demagnetization part arranged at two ends of the main body, wherein the width of the main body is smaller than the widths of the first anti-demagnetization part and the second anti-demagnetization part. Compared with the magnetic steel with a rectangular cross-section, the use of the magnetic steel is reduced, which helps to reduce the production cost of the magnetic steel, and further reduce the comprehensive cost of the rotor and the motor.

[0032] Furthermore, since the magnetic flux area provided by the magnetic steel in the rotor radiation direction does not change compared with the magnetic flux area provided by the rectangular magnetic steel, or the change is negligible, the rotor magnetic flux of the motor using the magnetic steel remains unchanged, which helps to reduce the temperature rise of the rotor, reduce the risk of magnetic steel demagnetization, and further enhance the anti-demagnetization performance of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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.

[0034] Figure 1 This is a schematic structural diagram of an embodiment of the magnetic steel of the utility model;

[0035] Figure 2 for Figure 1 Parameter diagram of medium magnetic steel;

[0036] Figure 3 This is an exploded schematic diagram of an embodiment of a rotor of the utility model;

[0037] Figure 4 for Figure 3 Schematic diagram of the structure of the middle rotor punching plate;

[0038] Figure 5 for Figure 3 Schematic diagram of the assembly of the middle rotor punching and magnetic steel;

[0039] Figure 6 for Figure 3 Schematic diagram of the structure of the full-connected magnetic bridge punching plate;

[0040] Figure 7 It is a schematic diagram of the structure in which two rotor punching sheets are stacked by rotation.

[0041] Description of Figure Numbers:

[0042]

[0043]

[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] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] 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 under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B as an example", including solution A, or 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 they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0049] The utility model provides a rotor.

[0050] Reference Figures 1 to 7 In the embodiment of the utility model, the rotor includes a rotor core 20 and a magnetic steel 10. The rotor core 20 includes a plurality of rotor punchings 21. The plurality of rotor punchings 21 are stacked and formed with magnetic steel slots 22. The magnetic steel slots 22 are arranged at intervals along the circumference of the rotor punchings 21. A plurality of magnetic steels 10 are provided and are respectively installed in each of the magnetic steel slots 22.

[0051] Wherein, the magnetic steel includes a main body 11, a first anti-demagnetization part 12 and a second anti-demagnetization part 13 respectively connected to the two ends of the main body 11 in the length direction, a first transition part connecting the main body 11 and the first anti-demagnetization part 12, and a second transition part connecting the main body 11 and the second anti-demagnetization part 13. The width of the main body 11 is A, the width of the first anti-demagnetization part 12 is B1, the width of the second anti-demagnetization part 13 is B2, and A<B1, A<B2. Such an arrangement can reduce the use of the magnetic steel 10 and reduce the cost by improving the structure of the magnetic steel 10, while ensuring the anti-demagnetization performance of the rotor as a whole.

[0052] Specifically, due to the setting of A<B1, A<B2, the width of the main body 11 is smaller than the width of the first anti-demagnetization part 12 and the second anti-demagnetization part 13. Compared with the magnetic steel 10 with a rectangular cross section, the amount of magnetic steel 10 used can be effectively reduced, which helps to reduce the manufacturing cost of the magnetic steel 10, thereby reducing the overall cost of the rotor. The width direction is perpendicular to the length direction of the main body 11, and the length direction of the main body 11 is the radial direction of the rotor after the magnetic steel 10 is assembled to the rotor core 20.

[0053] The magnetic steel slot 22 is adapted to the magnetic steel 10 to ensure the connection reliability between the magnetic steel 10 and the rotor core 20, reduce the possibility of separation of the magnetic steel 10 and the rotor core 20 when the rotor is working, and improve the anti-demagnetization performance of the rotor while reducing the cost due to the specific structure of the magnetic steel 10; wherein, when the magnetic steel 10 is assembled to the rotor core 20 through the magnetic steel slot 22, the first anti-demagnetization portion 12 and the second anti-demagnetization portion 13 are arranged along the radial direction of the rotor, and are connected to the main body 11 located in the middle through the first transition portion and the second transition portion, The two magnetic steels 10 and 11 are fixedly connected as a whole. Since the magnetic flux area required in the rotor radiation direction is mainly located in the first anti-demagnetization part 12 and the second anti-demagnetization part 13, the magnetic flux area provided by the magnetic steel 10 in this embodiment is not changed compared with the magnetic flux area provided by the rectangular magnetic steel 10, or the change is negligible. Furthermore, the rotor magnetic flux of the motor using the magnetic steel 10 remains unchanged, so that the magnetic field strength remains unchanged, which helps to reduce the temperature rise of the rotor, reduce the risk of demagnetization of the magnetic steel 10, and further enhance the anti-demagnetization performance of the rotor.

[0054] In addition, the first anti-demagnetization part 12 and the second anti-demagnetization part 13 can be symmetrically arranged with respect to the length extension direction of the main body 11; or, the first anti-demagnetization part 12 and the second anti-demagnetization part 13 have different protruding lengths on the same side of the main body 11; or, in the width direction of the main body 11, the first anti-demagnetization part 12 and the second anti-demagnetization part 13 extend in opposite directions, etc. The size, shape and other structures of the cross section of the first anti-demagnetization part 12 and the second anti-demagnetization part 13 can be completely equal, the size includes the width size and the length size, and the shape can include but is not limited to a rectangle, a circle, a trapezoid, and of course, the size, shape and other structures of the cross section of the first anti-demagnetization part 12 and the second anti-demagnetization part 13 can also be at least partially different; optionally, in this embodiment, the cross section of the magnetic steel 10 is approximately in the shape of an "I".

[0055] In the technical solution of the utility model, the magnetic steel 10 includes a main body 11 and a first anti-demagnetization portion 12 and a second anti-demagnetization portion 13 arranged at two ends of the main body 11, wherein the width of the main body 11 is smaller than the widths of the first anti-demagnetization portion 12 and the second anti-demagnetization portion 13. Compared with the magnetic steel 10 with a rectangular cross-section, the use of the magnetic steel 10 is reduced, which helps to reduce the production cost of the magnetic steel 10, and further reduce the comprehensive cost of the rotor and the motor.

[0056] Furthermore, since the magnetic flux area provided by the magnetic steel 10 in the rotor radiation direction does not change compared with the magnetic flux area provided by the rectangular magnetic steel 10, or the change is negligible, the rotor magnetic flux of the motor using the magnetic steel 10 remains unchanged, which helps to reduce the temperature rise of the rotor, reduce the risk of demagnetization of the magnetic steel 10, and further enhance the anti-demagnetization performance of the rotor.

[0057] Reference Figure 2In one embodiment, the length of the main body 11 is C, the total length of the magnetic steel 10 is D, the length of the first anti-demagnetization part 12 is E, and the length of the second anti-demagnetization part 13 is F, wherein C / D+E / F≤B / A, and 1.4≤B / A≤1.8, and the width B is any one of the width of the first anti-demagnetization part 12 and the width of the second anti-demagnetization part 13; specifically, when the specific value of C / D+E / F or B / A is less than 1.4, that is, the width of the main body 11 is too large, the amount of magnetic steel 10 used is large, and the manufacturing cost of the magnetic steel 10 cannot be reliably reduced, or , the width of the first anti-demagnetization part 12 or the second anti-demagnetization part 13 is too small, which affects the anti-demagnetization performance of the magnetic steel 10; when the specific value of C / D+E / F or B / A is greater than 1.8, it is easy to reduce the usage of the magnetic steel 10 too much, or the width of the main body 11 is too small, which affects the structural stability and anti-demagnetization performance of the magnetic steel 10; therefore, by limiting 1.4≤B / A≤1.8, the width design of the main body 11, the first anti-demagnetization part 12 and the second anti-demagnetization part 13 can be used to reasonably reduce the usage of the magnetic steel 10, and at the same time, avoid affecting the magnetic flux area and ensure the anti-demagnetization performance of the magnetic steel 10. It is also possible to limit C / D+E / F≤B / A, that is, 1.4≤C / D+E / F≤1.8. The length ratio between the main body 11 and the magnetic steel 10, and the length ratio between the first anti-demagnetization part 12 and the second anti-demagnetization part 13 can be used to determine the specific usage of the magnetic steel 10, thereby ensuring that the anti-demagnetization performance of the magnetic steel 10 is improved while reducing the usage of the magnetic steel 10 and reducing costs.

[0058] Furthermore, in order to further limit the specific structure of the magnetic field by the length of each part of the structure on the magnetic steel 10, in one embodiment, by limiting: 0.6≤C / D≤0.8; and / or, 0.8≤E / F≤1.2, in this way, the ratio of the sum of the lengths of the first anti-demagnetization part 12 and the second anti-demagnetization part 13 to the total length of the magnetic steel 10 is limited by the length ratio between the length of the main body 11 and the total length of the magnetic steel 10, which helps to ensure that the magnetic flux area of ​​the magnetic steel 10 meets the anti-demagnetization performance of the magnetic steel 10; the installation orientation of the magnetic steel 10 in the rotor core 20 can also be limited by the length ratio between the first anti-demagnetization part 12 and the second anti-demagnetization part 13, that is, the first anti-demagnetization part 12 or the second anti-demagnetization part 13 is determined to be close to the outside of the rotor core 20 according to the magnetic flux density. When the length of the first anti-demagnetization part 12 is greater than the length of the second anti-demagnetization part 13, the first anti-demagnetization part 12 is close to the outside of the rotor core 20, which helps to better reduce costs and ensure the anti-demagnetization performance of the magnetic steel 10.

[0059] Reference Figure 2In one embodiment, a first inclined surface 15 is provided on the first transition portion, and a first inclination angle of the first inclined surface 15 is J1. A second inclined surface 16 is provided on the second transition portion, and a second inclination angle of the second inclined surface 16 is J2. Specifically, by setting the first inclined surface 15 and the second inclined surface 16, the magnetic flux area of ​​the first transition portion can be between the first anti-demagnetization portion 12 and the main body 11, and the magnetic flux area of ​​the second transition portion can be between the second anti-demagnetization portion 13 and the main body 11, which plays a transition role, helps to improve the distribution of magnetic lines of force, improve the anti-demagnetization performance of the magnetic steel 10, and at the same time, achieve the purpose of cost reduction.

[0060] Among them, when the first anti-demagnetization portion 12 and the second anti-demagnetization portion 13 are both symmetrically arranged about the length extension direction of the main body 11, two first inclined surfaces 15 are symmetrically arranged on the first transition portion, and the first inclined angle of the first inclined surface 15 is J1, and two second inclined surfaces 16 are symmetrically arranged on the second transition portion, and the second inclined angle of the second inclined surface 16 is J2, which is beneficial to the processing of the magnetic steel 10 and improves the processing efficiency. Of course, in other embodiments, the first anti-demagnetization portion 12 and the second anti-demagnetization portion 13 may not be symmetrically arranged about the length extension direction of the main body 11.

[0061] Specifically, it is defined that 0.9≤J1 / J2≤1.1, that is, the first inclination angle and the second inclination angle can be equal, or there can be an angle difference between the first inclination angle and the second inclination angle, so that the first anti-demagnetization part 12 and the second anti-demagnetization part 13 can adapt to the width difference between the main body 11, ensure the reliable connection and smooth transition between the first anti-demagnetization part 12, the second anti-demagnetization part 13 and the main body 11, help to improve the distribution of magnetic lines of force, and ensure the electromagnetic performance of the motor.

[0062] Further, combined with 0.9≤J1 / J2≤1.1, in one embodiment, tan(J1)≤C / D+E / F≤B / A≤tan(K*J1), and 1.1≤K≤1.5 are defined. Since C / D+E / F or B / A is greater than or equal to 1.4, and less than or equal to 1.8, tan(J1) may be less than or equal to 1.4, and tan(K*J1) may be greater than or equal to 1.8. The specific values ​​of the first inclination angle and the second inclination angle may be determined to a certain extent according to the parameters of the magnetic steel 10, thereby achieving the purpose of reducing costs and enhancing the anti-demagnetization performance. And since there is no tan90°, J1≠90°, and J2≠90°. Optionally, in this embodiment, J1=J2=45°.

[0063] Optionally, in one embodiment, the magnetic steel 10 is a ferrite magnetic steel 10. Due to the characteristics of the ferrite material, the production process is simple, and it is convenient to use a mold to process the magnetic steel 10, thereby improving the manufacturing feasibility of the magnetic steel 10. Moreover, the ferrite material is low in price, which helps to reduce the manufacturing cost of the magnetic steel 10.

[0064] Reference Figure 1 In one embodiment, in the thickness direction of the magnetic steel 10, the end face edge of the magnetic steel 10 is provided with a chamfer 14, so that when the magnetic steel 10 is inserted into the magnetic steel slot 22 of the rotor core 20, the chamfer 14 on the magnetic steel 10 is used to abut against the slot wall of the magnetic steel slot 22, and the magnetic steel 10 is guided to be inserted into the magnetic steel slot 22, which is conducive to reducing the difficulty of inserting the magnetic steel 10 and completing the assembly. In addition, when a limiting structure is provided in the magnetic steel slot 22, and the limiting structure is used to assist in strengthening the connection strength between the magnetic steel 10 and the rotor core 20, taking the limiting structure as a spring sheet 23 as an example, the chamfer 14 can guide the deformation direction of the spring sheet 23 to a certain extent, and at the same time ensure the limiting effect of the spring sheet 23 on the magnetic steel 10. The thickness direction is perpendicular to the width direction and the length direction of the main body 11, respectively, and the thickness direction of the magnetic steel 10 is the rotor axial direction after the magnetic steel 10 is assembled to the rotor core 20.

[0065] Optionally, the magnetic steel 10 is clearance-matched with the magnetic steel slot 22 to ensure that the magnetic steel 10 can be inserted into the magnetic steel slot 22 , thereby completing the assembly of the magnetic steel 10 and the rotor core 20 .

[0066] Among them, in one embodiment, a gap W is provided between the magnetic steel 10 and the magnetic steel slot 22, and 0.05mm≤W≤0.15mm is provided to improve the assembly convenience and assembly reliability of the magnetic steel 10 and the rotor core 20. Specifically, when the gap between the magnetic steel 10 and the magnetic steel slot 22 is less than 0.05mm, the gap is too small, and the difficulty of inserting the magnetic steel 10 into the magnetic steel slot 22 increases. When the gap between the magnetic steel 10 and the magnetic steel slot 22 is greater than 0.15mm, the gap is too large, and the relative movement of the magnetic steel 10 and the rotor core 20 is easy to occur due to the vibration generated during work, and the difficulty of constraining the relative movement of the magnetic steel 10 and the rotor core 20 increases; therefore, by limiting the gap between the magnetic steel 10 and the magnetic steel slot 22 to 0.05mm to 0.15mm, the assembly difficulty of the magnetic steel 10 and the rotor core 20 is effectively improved, and the assembly convenience and assembly reliability of the magnetic steel 10 and the rotor core 20 are improved.

[0067] Reference Figures 4 to 6In one embodiment, the rotor punching sheet 21 includes an inner ring portion 212 and a plurality of sector portions 211 distributed around the axis of the inner ring portion 212, and the magnetic steel slot 22 is formed between two adjacent sector portions 211 and the inner ring portion 212; wherein, at least a portion of the magnetic steel slot 22 is provided with a spring sheet 23 on the slot side wall, the top of the spring sheet 23 extends into the magnetic steel slot 22, and the top of the spring sheet 23 abuts against the side wall of the magnetic steel 10 to fix the magnetic steel 10; it can be understood that in the process of the magnetic steel 10 extending into the magnetic steel slot 22, the magnetic steel 10 can squeeze the spring sheet 23, so that the spring sheet 23 is The sheet 23 is deformed under pressure, and then the spring sheet 23 provides elastic pressure to the magnet 10, so that the magnet 10 is tightly fixed in the magnet slot 22. On the one hand, the spring sheet 23 extends into the magnet slot 22, which can ensure the clearance fit between the magnet 10 and the magnet slot 22, thereby satisfying 0.05mm≤W≤0.15mm, thereby improving the difficulty of assembling the magnet 10 and the rotor core 20. On the other hand, compared with the existing methods such as gluing or injection molding, the elastic deformation ability of the spring sheet 23 is used to achieve the tight fixation of the magnet 10, which improves the maintenance convenience and reduces the cost while ensuring the assembly stability of the magnet 10.

[0068] The number of spring clips 23 can be set according to the tightening strength requirements. One or more spring clips 23 can be set. When multiple spring clips 23 are set, the size and elastic deformation capacity of each spring clip 23 can be consistent or different, so as to provide sufficient fixing strength for the magnetic steel 10 and ensure the stable operation of the motor or compressor.

[0069] Furthermore, in one embodiment, at least a portion of the fan-shaped portion 211 is provided with a notch groove 221 on the side wall facing the magnetic steel groove 22, and the spring piece 23 is provided in the notch groove 221, and the spring piece 23 extends from the groove bottom of the notch groove toward the groove opening. The setting of the notch groove 221 can not only provide a space for the spring piece 23 to be installed and deformed, but also improve the elastic deformation ability of the spring piece 23 by extending the spring piece 23. At the same time, it is ensured that the spring piece 23 extends into the magnetic steel groove 22, so as to achieve the purpose of clearance fit between the magnetic steel 10 and the magnetic steel groove 22.

[0070] The notch groove 221 can be formed by a recessed shape of the side groove wall of the magnetic steel groove 110, wherein at least one of the groove walls on the opposite sides of the magnetic steel groove 22 is provided with a notch groove 221. When only one side groove wall is provided with the notch groove 221 and the spring piece 23, and the other side groove wall is not provided with the notch groove 221 and the spring piece 23, the effective contact area between the magnetic steel 10 and the magnetic steel groove 22 can be guaranteed, so as to achieve the coordination of tightness and support, and ensure the stability of the magnetic steel 10 in the magnetic steel groove 22.

[0071] In addition, the spring sheet 23 does not abut against the side groove wall of the notch groove 221 to ensure that the spring sheet 23 does not interfere with the adjacent rotor punching sheet 21 when deforming.

[0072] Furthermore, in one embodiment, at least a portion of the fan-shaped portion is provided with an avoidance groove 222 on the side wall facing the magnetic steel slot 22, and the avoidance groove 222 corresponds to the notch groove 221 on the axially adjacent rotor punching 21. In this way, in the axial direction of the rotor core 20, avoidance spaces are respectively reserved on the upper and lower sides of the spring sheet 23, so that when the magnetic steel 10 is inserted into the magnetic steel slot 22, the spring sheet 23 is squeezed and reliably bent and deformed, and at the same time, the risk of interference between the spring sheet 23 and the adjacent rotor punching 21 is reduced.

[0073] Specifically, Figure 4 and Figure 6 As shown, a plurality of the notch grooves 221 and a plurality of the avoidance grooves 222 are alternately arranged on a rotor punching 21 so as to be evenly distributed in the circumferential direction of the rotor punching 21, which helps to balance the structure of the rotor punching 21 and ensure the stability of the rotor punching 21. At the same time, it is also convenient for batch processing and lamination of multiple rotor punchings 21.

[0074] Of course, since the rotor core 20 includes a plurality of rotor punchings 21, the specific structures of the rotor punchings 21 may be completely the same or partially the same. Under the condition of ensuring the assembly between the magnetic steel 10 and the rotor core 20, one or more types of rotor punchings 21 may be stacked to form the rotor core 20 and corresponding magnetic steel slots 22, which helps to improve the structural diversity of the rotor core 20.

[0075] Reference Figure 7 In one embodiment, the plurality of rotor punching sheets 21 are alternately rotated by a mechanical angle θ for stacking, and θ=360° / P; the number of the magnetic steel slots 22 is P, P=12±k*2, and k is 1 or 2.

[0076] It can be understood that a plurality of notched grooves 221 and a plurality of avoidance grooves 222 are alternately arranged on the rotor punching 21. Thus, when the rotor punchings 21 are stacked layer by layer, each layer of the rotor punchings 21 needs to be rotated by a mechanical angle θ, so that the notched grooves 221 of the upper rotor punchings 21 are arranged corresponding to the avoidance grooves 222 of the lower rotor punchings 21; a spring sheet 23 is arranged in conjunction with the notched grooves 221, so that the spring sheet 23 can be reliably deformed when the magnet 1 is inserted, thereby ensuring the reliability of the limiting position of the rotor core 20 on the magnet 10, and further, effectively avoiding the generation of noise due to resonance of the magnet 10 with the magnetic field and damage due to collision between the magnet 10 and the rotor core 20 when the motor is running at high frequency, thereby improving the working efficiency and service life of the motor.

[0077] Among them, θ=360° / P, P is the total number of magnetic steel slots 22 on the rotor punching sheet 21; by limiting the mechanical angle, on the one hand, it is convenient to set the rotation angle of the stamping equipment (punching head) during the process of forming the magnetic steel slots 22, and complete the processing of the magnetic steel slots 22 at this angle, which helps to improve the processing efficiency; on the other hand, it is convenient to rotate at a mechanical angle when stacking the rotor punching sheets 21, so that the notch slots 221 and the avoidance slots 222 of two adjacent rotor punching sheets 21 can be aligned, thereby improving the alignment accuracy and alignment efficiency.

[0078] In addition, the number P of the magnetic steel slots 22 satisfies: P = 12 ± k * 2, k is 1 or 2, that is, the slot poles of the stator and rotor are matched with 12 stator slots and 12 ± k * 2 rotor poles, which can ensure the reliable operation of the motor applied to the rotor and improve the power and efficiency of the motor; wherein, taking the number of stator slots as 12 as an example, k is equal to 1; or, k is equal to 2; when k is equal to 1, the number of rotor poles can be 10 or 14; when k is equal to 2, the number of rotor poles can be 8 or 16. Of course, the number of stator slots can be other values, and the number of rotor poles changes accordingly to meet the user's usage requirements.

[0079] Reference Figure 5 In one embodiment, the spring sheet 23 is provided on the outer periphery of the inner ring portion 212, and the spring sheet 23 extends along the radial direction of the rotor punching 21, that is, the spring sheet 23 protrudes from the inner ring portion 212, and is arranged corresponding to the gap between two adjacent sector portions 211. In this way, when the magnet 10 extends into the magnet slot 22, the magnet 10 can squeeze the spring sheet 23, so that the spring sheet 23 is compressed and deformed, and then the spring sheet 23 provides elastic pressure to the magnet 10, so that the magnet 10 is tightly fixed in the magnet slot 22, and the spring sheet 23 on the sector portion 211 can further improve the connection stability between the magnet 10 and the rotor core 20.

[0080] Optionally, in one embodiment, at least part of the sector-shaped portion 211 is connected to the inner ring portion 212 to ensure the integrity of the sector-shaped portion 211 and the inner ring portion 212, to facilitate the subsequent rotation and lamination of the rotor punching sheets 21, and to improve assembly efficiency.

[0081] Optionally, in one embodiment, two adjacent sector portions 211 are disconnected from one side of the inner ring portion 212, such as Figure 4 As shown, each sector portion 211 is relatively independent and is arranged at intervals along the circumferential direction of the inner ring portion 212 to form a semi-connected magnetic bridge punching. While facilitating the insertion of the magnetic steel 10 into the magnetic steel slot 22, the material usage of the rotor punching 21 can be reduced. At the same time, the magnetic steel slot 22 can be prevented from being deformed due to long-term alternating force, which helps to improve the service life of the rotor punching 21 and the matching accuracy between the rotor punching 21 and the magnetic steel 10.

[0082] In another embodiment, two adjacent sector portions 211 are connected by a bridge at a side away from the inner ring portion 212. Figure 6 As shown, the side of each sector 211 away from the inner ring portion 212 is connected in pairs through a bridge to form a fully connected magnetic bridge punching 24, so as to enhance the structural strength and stability of the rotor punching 21, thereby improving the overall strength and stability of the rotor core 20. However, in other embodiments, on the rotor punching 21, the sides of some adjacent two sector shaped portions 211 away from the inner ring portion 212 are connected to each other, and the sides of some adjacent two sector shaped portions 211 away from the inner ring portion 212 are disconnected.

[0083] In another embodiment, the rotor punching sheet 21 includes at least one fully connected magnetic bridge punching sheet 24 and a plurality of half-connected magnetic bridge punching sheets, such as Figure 3 As shown, the position of the fully connected magnetic bridge punching sheet 24 on the rotor core 20 is flexible. When there is only one fully connected magnetic bridge punching sheet 24, the fully connected magnetic bridge punching sheet 24 can be set at the end of the rotor core 20 or between the two half-connected magnetic bridge punching sheets; when there are multiple fully connected magnetic bridge punching sheets 24, they can be respectively arranged at the end of the rotor core 20 and between the two half-connected magnetic bridge punching sheets.

[0084] Optionally, limited by the thickness of the rotor core 20 and the magnet 10 on the rotor axis, in one embodiment, at least one magnet 10 is disposed in a magnet slot 22, and when the magnet 10 is provided with two sections, the two sections of the magnet 10 are respectively inserted into the magnet slot 22 from both ends of the rotor core 20; after the two magnets 10 are inserted into the magnet slot 22, the deformation directions of the two spring sheets 23 are opposite.

[0085] Reference Figure 3 In one embodiment, the rotor further includes an end plate 30, which is located in the axial direction of the rotor core 20, and the end plate 30 and the rotor core are connected in series by fasteners; wherein, when two end plates 30 are provided, and are respectively provided at the two ends of the rotor core 20, the rotor core 20 and the magnetic steel 10 are clamped between the two end plates 30, which, on the one hand, helps to protect the rotor core 20 and the magnetic steel 10, and effectively prevents the magnetic steel 10 from being separated from the rotor core 20 in the axial direction of the rotor core 20, thereby improving the connection strength between the rotor core 20 and the magnetic steel 10; on the other hand, the provision of the end plate 30 increases the weight of the rotor, helps to increase the moment of inertia of the rotor, and ensures the stable rotation of the rotor. The axial direction of the rotor core 20 is the thickness direction of the magnetic steel 10.

[0086] Specifically, the thickness of the end plate 30 is H, the total length of the magnetic steel 10 in the radial direction is D, D / B≤H≤D / A, wherein B=B1≥B2, or B=B2≥B1. Specifically, the thickness of the end plate 30 is determined according to the specific size of the rotor. By limiting D / B≤H≤D / A, it is effectively avoided that the thickness of the end plate 30 is too large, resulting in a smaller magnetic permeability than the rotor of the same weight, which affects the anti-demagnetization performance of the rotor and its normal operation. The radial direction is specifically manifested as the radial direction of the rotor core 20.

[0087] Reference Figure 4 In one embodiment, the rotor punching 21 is provided with rivet holes 213 and / or rivet holes 214 at intervals along its circumferential direction, which are used to connect adjacent stacked rotor punchings 21; it can be understood that the rotor punching 21 can be provided with rivet holes 213 and rivet holes 214 at the same time, which are specifically provided on the fan-shaped portion 211. During the assembly process, the rivet holes 213 are used to connect the adjacent stacked fan-shaped portions 211, and the connection between the fan-shaped portion 211 and the inner ring portion 212 is used to reliably ensure the stable connection between the rotor punchings 21 to form the rotor core 20; on this basis, a rivet hole 214 can be provided that penetrates the end plate 30 and the rotor core 20, and then a fastener such as a rivet member 40 is inserted into the rivet hole 214, such as Figure 3 As shown, the rivet 40 can connect the end plate 30 and the rotor core 20 in series, further reducing the risk of the magnetic steel 10 being separated from the rotor core 20, and at the same time, improving the assembly reliability of the rotor as a whole.

[0088] A plurality of rivet holes 213 may be provided, wherein at least two may be provided on the fan-shaped portion 211 , and further, the rivet hole 214 is located between the two rivet holes 213 , with one rivet hole 213 being close to the inner ring portion 212 and the other rivet hole 213 being far away from the inner ring portion 212 , which helps to improve the connection reliability and stability between the rotor punchings 21 .

[0089] The utility model also proposes a motor, which includes a rotor. The specific structure of the rotor refers to the above embodiment. Since the rotor 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.

[0090] 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.

[0091] In this embodiment, the compressor can be a DC variable frequency compressor. By adopting the rotor of the above-mentioned magnetic steel 10 and rotor core 20, it helps to reduce the production process and accessories of the motor, enhance the stability of the magnetic steel 10, and also improve the reliability of the compressor and reduce the overall cost of the product.

[0092] The above description is only an optional 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 inventive 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: The rotor core comprises a plurality of rotor punchings, wherein the plurality of rotor punchings are stacked and formed with magnetic steel slots, wherein a plurality of magnetic steel slots are arranged at intervals along the circumference of the rotor punchings; A plurality of magnetic steels are provided and are respectively installed in the magnetic steel slots; Wherein, the magnetic steel includes a main body, a first anti-demagnetization part and a second anti-demagnetization part respectively connected to the two ends of the main body in the length direction, a first transition part connecting the main body and the first anti-demagnetization part, and a second transition part connecting the main body and the second anti-demagnetization part. The width of the main body is A, the width of the first anti-demagnetization part is B1, the width of the second anti-demagnetization part is B2, and A<B1, A<B2.

2. The rotor according to claim 1, characterized in that The length of the main body is C, the total length of the magnetic steel is D, the length of the first anti-demagnetization part is E, the length of the second anti-demagnetization part is F, C / D+E / F≤B / A, and 1.4≤B / A≤1.8, and the width B is any one of the width of the first anti-demagnetization part and the width of the second anti-demagnetization part.

3. The rotor according to claim 2, characterized in that 0.6≤C / D≤0.8; and / or, 0.8≤E / F≤1.

2.

4. The rotor according to claim 3, characterized in that The first transition portion is provided with a first inclined surface, the first inclined surface has a first inclined angle of J1, the second transition portion is provided with a second inclined surface, the second inclined surface has a second inclined angle of J2; 0.9≤J1 / J2≤1.1; and / or, tan(J1)≤C / D+E / F≤B / A≤tan(K*J1), and 1.1≤K≤1.

5.

5. The rotor according to claim 1, characterized in that The magnetic steel is a ferrite magnetic steel; And / or, in the thickness direction of the magnetic steel, the end surface edge of the magnetic steel is provided with a chamfer.

6. The rotor according to claim 1, characterized in that A gap W is provided between the magnetic steel and the magnetic steel slot, and the gap W is 0.05 mm ≤ W ≤ 0.15 mm.

7. The rotor according to claim 1, characterized in that The rotor punching sheet comprises an inner ring portion and a plurality of sector portions distributed around the axis of the inner ring portion, and the magnetic steel slot is formed between two adjacent sector portions and the inner ring portion; Among them, at least part of the groove side walls of the magnetic steel groove are provided with spring plates, the top of the spring plates extends into the magnetic steel groove, and the top of the spring plates abuts against the side walls of the magnetic steel to fix the magnetic steel.

8. The rotor according to claim 7, characterized in that At least a portion of the fan-shaped portion is provided with a notch groove on the side wall facing the magnetic steel groove, and the spring sheet is provided in the notch groove, and the spring sheet extends from the groove bottom of the notch groove toward the groove opening.

9. The rotor according to claim 8, characterized in that At least a portion of the side walls of the sector-shaped portion facing the magnetic steel slot are provided with avoidance grooves, and the avoidance grooves correspond to the notched grooves on the rotor punching sheets adjacent in the axial direction.

10. The rotor according to claim 9, characterized in that A plurality of the notch grooves and a plurality of the avoidance grooves are alternately arranged on the rotor punching sheet.

11. The rotor according to claim 10, characterized in that The plurality of rotor punching sheets are alternately rotated by a mechanical angle θ to be stacked, and θ=360° / P; The number of the magnetic steel slots is P, P=12±k*2, k is 1 or 2.

12. The rotor according to claim 7, characterized in that The outer periphery of the inner ring portion is provided with the spring sheet, and the spring sheet extends in the radial direction of the rotor punching sheet.

13. The rotor according to claim 7, characterized in that At least part of the sector-shaped portion is connected to the inner ring portion; and / or, Two adjacent sector-shaped portions are disconnected from one side of the inner ring portion; and / or, The sides of two adjacent sector-shaped portions facing away from the inner ring portion are connected by a bridge.

14. The rotor according to claim 7, characterized in that The rotor further includes an end plate, which is located in the axial direction of the rotor core, and the end plate and the rotor core are connected in series via fasteners.

15. A motor, characterized in that: Comprising a rotor as claimed in any one of claims 1 to 14.

16. A compressor, characterized in that: Comprising the motor as claimed in claim 15.

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