Rotor, motor and compressor

Abstract

The invention 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 arranged at intervals along the circumferential direction of the rotor punching sheets; 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, by improving the magnetic steel structure, the usage amount of the magnetic steel is reduced, the cost is reduced, and meanwhile the demagnetization resistance of the whole rotor is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a rotor, motor and compressor. Background Technology

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

[0003] Currently, the magnets in permanent magnet motors are mostly in the shape of "I" or "V" blocks, which is relatively simple in shape. In order to improve the anti-demagnetization performance of the motor rotor, multiple magnets with different anti-demagnetization performance are often combined, which increases the cost of the motor to some extent. Summary of the Invention

[0004] The main objective of this invention is to provide a magnet that aims to reduce the amount of magnet used and lower costs by improving the magnet structure, while ensuring the overall anti-demagnetization performance of the rotor.

[0005] To achieve the above objectives, the present invention provides a magnet comprising:

[0006] The rotor core includes multiple rotor laminations, which are stacked and form magnetic slots. Multiple magnetic slots are arranged at intervals along the circumference of the rotor laminations.

[0007] Multiple magnets are provided and are installed in each of the magnet slots;

[0008] The magnet includes a main body, a first anti-demagnetization part and a second anti-demagnetization part 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, and the width of the second anti-demagnetization part is B2, and A < B1 and A < B2.

[0009] Optionally, the length of the main body is C, the total length of the magnet 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 either the width of the first anti-demagnetization part or 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, the first transition portion is provided with a first inclined surface, the first inclined surface having a first inclination angle of J1, and the second transition portion is provided with a second inclined surface, the second inclined surface having a second inclination angle of 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 magnet is a ferrite magnet.

[0015] Optionally, the end face edge of the magnet is chamfered in the thickness direction.

[0016] Optionally, a gap W is provided between the magnet and the magnet groove, where 0.05mm≤W≤0.15mm.

[0017] Optionally, the rotor lamination includes an inner ring portion and a plurality of sector portions distributed around the axis of the inner ring portion, wherein the magnet slot is formed between two adjacent sector portions and the inner ring portion;

[0018] In this embodiment, at least a portion of the magnet groove has a spring piece on its sidewall, the top of the spring piece extending into the magnet groove, and the top of the spring piece abutting against the sidewall of the magnet to fix the magnet.

[0019] Optionally, at least a portion of the fan-shaped portion has a notch on the side wall facing the magnet groove, and the spring piece is provided in the notch, the spring piece extending from the bottom of the notch towards the groove opening.

[0020] Optionally, at least a portion of the sector portion has a clearance groove on the sidewall facing the magnet slot, the clearance groove corresponding to the notch on the rotor lamination adjacent in the axial direction.

[0021] Optionally, a plurality of notched slots and a plurality of clearance slots are alternately provided on one of the rotor laminations.

[0022] Optionally, multiple rotor laminations are stacked by rotating alternately by a mechanical angle θ, where θ = 360° / P;

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

[0024] Optionally, the outer periphery of the inner ring is provided with the spring sheet, which extends radially along the rotor lamination.

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

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

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

[0028] Optionally, the rotor further includes an end plate located axially above the rotor core and connected to the rotor core by fasteners.

[0029] The present invention also proposes an electric motor comprising a rotor as described above.

[0030] The present invention also proposes a compressor comprising the motor described above.

[0031] In the technical solution of the present invention, the magnet includes a main body and a first anti-demagnetization part and a second anti-demagnetization part disposed at both ends of the main body. The width of the main body is smaller than the width of both the first anti-demagnetization part and the second anti-demagnetization part. Compared with a magnet with a rectangular cross-section, the amount of magnet used is reduced, which helps to reduce the manufacturing cost of the magnet and thus reduce the overall cost of the rotor and motor.

[0032] Furthermore, since the magnetic flux area provided by the magnet in the rotor radial direction is not changed compared to that provided by the rectangular magnet, or the change is negligible, the rotor magnetic flux of the motor using this magnet remains unchanged. This helps to reduce the temperature rise of the rotor, reduce the risk of magnet demagnetization, and further enhance the rotor's anti-demagnetization performance. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a magnet according to an embodiment of the present invention;

[0035] Figure 2 for Figure 1 A schematic diagram of the parameters of a medium-sized magnet;

[0036] Figure 3 This is an exploded view of an embodiment of the rotor of the present invention;

[0037] Figure 4 for Figure 3 Schematic diagram of the structure of the rotor lamination;

[0038] Figure 5 for Figure 3 Assembly diagram of the rotor laminations and magnets;

[0039] Figure 6 for Figure 3 Schematic diagram of the structure of the fully connected magnetic bridge lamination;

[0040] Figure 7 This is a schematic diagram of a structure in which two rotor laminations are stacked by rotation.

[0041] Explanation of icon numbers:

[0042]

[0043]

[0044] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0048] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0049] This invention proposes a rotor.

[0050] Reference Figures 1 to 7 In this embodiment of the invention, the rotor includes a rotor core 20 and magnets 10. The rotor core 20 includes a plurality of rotor laminations 21, which are stacked to form magnet slots 22. The magnet slots 22 are arranged at intervals along the circumference of the rotor laminations 21. A plurality of magnets 10 are provided and are respectively installed in each of the magnet slots 22.

[0051] The magnet includes a main body 11, a first anti-demagnetizing part 12 and a second anti-demagnetizing part 13 connected to the two ends of the main body 11 along its length, a first transition part connecting the main body 11 and the first anti-demagnetizing part 12, and a second transition part connecting the main body 11 and the second anti-demagnetizing part 13. The width of the main body 11 is A, the width of the first anti-demagnetizing part 12 is B1, and the width of the second anti-demagnetizing part 13 is B2, and A < B1 and A < B2. This configuration can reduce the amount of magnet 10 used and lower the cost by improving the structure of the magnet 10, while ensuring the overall anti-demagnetizing performance of the rotor.

[0052] Specifically, due to the setting of A < B1 and A < B2, the width of the main body 11 is smaller than the width of both the first anti-demagnetization part 12 and the second anti-demagnetization part 13. Compared with the magnet 10 with a rectangular cross-section, this effectively reduces the amount of magnet 10 used, helps to reduce the manufacturing cost of the magnet 10, and thus reduces 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 magnet 10 is assembled to the rotor core 20.

[0053] The magnet slot 22 is adapted to the magnet 10, ensuring the reliability of the connection between the magnet 10 and the rotor core 20, reducing the possibility of separation between the magnet 10 and the rotor core 20 during rotor operation. Furthermore, due to the specific structure of the magnet 10, it reduces costs while improving the rotor's anti-demagnetization performance. When the magnet 10 is assembled to the rotor core 20 through the magnet slot 22, the first anti-demagnetization part 12 and the second anti-demagnetization part 13 are arranged radially along the rotor and connected to the main body 11 located in the middle via the first transition part and the second transition part. Since the magnetic flux area required in the rotor's radial 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 magnet 10 in this embodiment is not changed compared to the magnetic flux area provided by the rectangular magnet 10, or the change is negligible. Therefore, the rotor magnetic flux of the motor using the magnet 10 remains unchanged, keeping the magnetic field strength constant, which helps to reduce the temperature rise of the rotor, reduce the risk of demagnetization of the magnet 10, and further enhance the rotor's anti-demagnetization performance.

[0054] Furthermore, both the first anti-demagnetizing part 12 and the second anti-demagnetizing part 13 can be symmetrically arranged about the length of the main body 11; or, the protruding lengths of the first anti-demagnetizing part 12 and the second anti-demagnetizing part 13 on the same side of the main body 11 are different; or, in the width direction of the main body 11, the first anti-demagnetizing part 12 and the second anti-demagnetizing part 13 extend in opposite directions, etc. The dimensions, shapes, and other structures of the cross-sections of the first anti-demagnetizing part 12 and the second anti-demagnetizing part 13 can be completely equal, including width and length dimensions, and the shapes can be, but are not limited to, rectangles, circles, and trapezoids. Of course, the dimensions, shapes, and other structures of the cross-sections of the first anti-demagnetizing part 12 and the second anti-demagnetizing part 13 can also be at least partially different; optionally, in this embodiment, the cross-sectional shape of the magnet 10 is approximately "I" shaped.

[0055] In the technical solution of the present invention, the magnet 10 includes a main body 11 and a first anti-demagnetization part 12 and a second anti-demagnetization part 13 disposed at both ends of the main body 11. 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 magnet 10 with a rectangular cross-section, the amount of magnet 10 used is reduced, which helps to reduce the manufacturing cost of the magnet 10, and thus reduce the overall cost of the rotor and motor.

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

[0057] Reference Figure 2In one embodiment, the length of the main body 11 is C, the total length of the magnet 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 either the width of the first anti-demagnetization part 12 or 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 magnet 10 used is large, and it is impossible to reliably reduce the manufacturing cost of the magnet 10, or If the width of the first anti-demagnetization part 12 or the second anti-demagnetization part 13 is too small, it will affect the anti-demagnetization performance of the magnet 10. When the specific value of C / D+E / F or B / A is greater than 1.8, it is easy to reduce the amount of magnet 10 used, or if the width of the main body part 11 is too small, it will affect the structural stability and anti-demagnetization performance of the magnet 10. Therefore, by limiting 1.4≤B / A≤1.8, the amount of magnet 10 used can be reasonably reduced by designing the width of the main body part 11, the first anti-demagnetization part 12 and the second anti-demagnetization part 13. At the same time, the impact on the magnetic flux area is avoided, and the anti-demagnetization performance of the magnet 10 is guaranteed. It is also possible to limit C / D+E / F≤B / A, that is, 1.4≤C / D+E / F≤1.8. The specific amount of magnet 10 used can be determined by the length ratio between the main body 11 and the magnet 10, and the length ratio between the first anti-demagnetization part 12 and the second anti-demagnetization part 13. This ensures that while reducing the amount of magnet 10 used and lowering costs, the anti-demagnetization performance of the magnet 10 is improved.

[0058] Furthermore, in order to further define the specific structure of the magnetic field by the length of each part of the magnet 10, in one embodiment, the following is defined: 0.6≤C / D≤0.8; and / or 0.8≤E / F≤1.2. Thus, the ratio of the length of the first anti-demagnetizing part 12 and the second anti-demagnetizing part 13 to the total length of the magnet 10 is defined by the length ratio between the length of the main body 11 and the total length of the magnet 10. This helps to ensure that the magnetic flux area of ​​the magnet 10 meets the anti-demagnetizing performance of the magnet 10. The installation orientation of the magnet 10 in the rotor core 20 can also be defined by the length ratio between the first anti-demagnetizing part 12 and the second anti-demagnetizing part 13. That is, the first anti-demagnetizing part 12 or the second anti-demagnetizing part 13 is located near the outside of the rotor core 20 according to the magnetic flux density. When the length of the first anti-demagnetizing part 12 is greater than the length of the second anti-demagnetizing part 13, the first anti-demagnetizing part 12 is located near the outside of the rotor core 20, which helps to better reduce costs and ensure the anti-demagnetizing performance of the magnet 10.

[0059] Reference Figure 2In one embodiment, the first transition portion is provided with a first inclined surface 15, the first inclined surface 15 having a first inclination angle of J1, and the second transition portion is provided with a second inclined surface 16, the second inclined surface 16 having a second inclination angle of 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 portion 11, and the magnetic flux area of ​​the second transition portion can be between the second anti-demagnetization portion 13 and the main body portion 11, thus playing a transitional role, which helps to improve the distribution of magnetic lines of force, improve the anti-demagnetization performance of the magnet 10, and at the same time, achieve the purpose of cost reduction.

[0060] In this configuration, when both the first anti-demagnetizing part 12 and the second anti-demagnetizing part 13 are symmetrically arranged about the length extension direction of the main body 11, two first inclined surfaces 15 are symmetrically arranged on the first transition part, with a first inclination angle of J1 for each first inclined surface 15. Similarly, two second inclined surfaces 16 are symmetrically arranged on the second transition part, with a second inclination angle of J2 for each second inclined surface 16. This facilitates the processing of the magnet 10 and improves processing efficiency. Of course, in other embodiments, the first anti-demagnetizing part 12 and the second anti-demagnetizing part 13 may not be symmetrically arranged about the length extension direction of the main body 11.

[0061] Specifically, the value is limited to 0.9≤J1 / J2≤1.1, meaning that the first tilt angle and the second tilt angle can be equal, or there can be an angle difference between the first tilt angle and the second tilt angle. This facilitates the adaptation of the first anti-demagnetization part 12 and the second anti-demagnetization part 13 to the width difference between them and the main body part 11, ensuring a reliable connection and smooth transition between the first anti-demagnetization part 12, the second anti-demagnetization part 13 and the main body part 11. This helps to improve the distribution of magnetic lines of force and ensure the electromagnetic performance of the motor.

[0062] Furthermore, combining 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, 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) can be less than or equal to 1.4, and tan(K*J1) can be greater than or equal to 1.8. This allows for the determination of the specific values ​​of the first and second tilt angles based on the parameters of the magnet 10, thereby achieving cost reduction and enhanced anti-demagnetization performance. Since tan90° does not exist, J1≠90°, and J2≠90°. Optionally, in this embodiment, J1=J2=45°.

[0063] Optionally, in one embodiment, the magnet 10 is a ferrite magnet 10. Due to the characteristics of ferrite materials, the production process is simple, and it is easy to use molds to form and process the magnet 10, which improves the manufacturing feasibility of the magnet 10. Moreover, its price is low, which helps to reduce the manufacturing cost of the magnet 10.

[0064] Reference Figure 1 In one embodiment, the end face edge of the magnet 10 is chamfered 14 in the thickness direction. This chamfer 14 allows the magnet 10 to abut against the wall of the magnet slot 22 during insertion into the rotor core 20, guiding the insertion and reducing the difficulty of insertion. Furthermore, when a limiting structure is provided within the magnet slot 22 to enhance the connection between the magnet 10 and the rotor core 20, taking a spring piece 23 as an example, the chamfer 14 can guide the deformation direction of the spring piece 23 to a certain extent, while ensuring the limiting effect of the spring piece 23 on the magnet 10. The thickness direction is perpendicular to the width and length directions of the main body 11, and the thickness direction of the magnet 10 is the rotor axis after the magnet 10 is assembled into the rotor core 20.

[0065] Optionally, the magnet 10 and the magnet slot 22 are fitted with a clearance to ensure that the magnet 10 can be inserted into the magnet slot 22 to complete the assembly of the magnet 10 and the rotor core 20.

[0066] In one embodiment, a gap W is provided between the magnet 10 and the magnet slot 22, where 0.05mm ≤ W ≤ 0.15mm, to improve the ease and reliability of assembling the magnet 10 and the rotor core 20. Specifically, when the gap between the magnet 10 and the magnet slot 22 is less than 0.05mm, the difficulty of inserting the magnet 10 into the magnet slot 22 increases due to the small gap. When the gap between the magnet 10 and the magnet slot 22 is greater than 0.15mm, the large gap makes it easy for relative movement between the magnet 10 and the rotor core 20 to occur due to vibrations generated during operation, and increases the difficulty of restraining relative movement between the magnet 10 and the rotor core 20. Therefore, by limiting the gap between the magnet 10 and the magnet slot 22 to 0.05mm to 0.15mm, the assembly difficulty of the magnet 10 and the rotor core 20 is effectively improved, thereby enhancing the ease and reliability of assembly.

[0067] Reference Figures 4 to 6In one embodiment, the rotor lamination 21 includes an inner ring portion 212 and a plurality of sector-shaped portions 211 distributed around the axis of the inner ring portion 212. A magnet groove 22 is formed between two adjacent sector-shaped portions 211 and the inner ring portion 212. At least a portion of the magnet groove 22 has a spring piece 23 disposed on its sidewall. The top of the spring piece 23 extends into the magnet groove 22, and the top of the spring piece 23 abuts against the sidewall of the magnet 10 to fix the magnet 10. It is understood that during the process of the magnet 10 extending into the magnet groove 22, the magnet 10 can compress the spring piece 23, causing the spring piece 23 to... When the spring piece 23 is compressed and deformed, it provides elastic pressure to the magnet 10, thereby securing the magnet 10 within the magnet slot 22. On one hand, the spring piece 23 extending into the magnet slot 22 ensures a clearance fit between the magnet 10 and the magnet slot 22, thus satisfying 0.05mm≤W≤0.15mm, which improves the assembly difficulty of the magnet 10 and the rotor core 20. On the other hand, compared with existing methods such as adhesive bonding or injection molding, using the elastic deformation capability of the spring piece 23 to secure the magnet 10 ensures the assembly stability of the magnet 10, improves maintenance convenience, and reduces costs.

[0068] The number of spring pieces 23 can be set according to the clamping strength requirements. One or more spring pieces can be set. When multiple spring pieces 23 are set, the size and elastic deformation capacity of each spring piece 23 can be the same or different, so as to provide sufficient fixing strength for the magnet 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 has a notch 221 on the side wall facing the magnet groove 22. The notch 221 contains the spring piece 23, which extends from the bottom of the notch 221 toward the opening. The notch 221 provides space for the spring piece 23 to be installed and deformed, and can also improve the elastic deformation capability of the spring piece 23 by extending it. At the same time, it ensures that the spring piece 23 extends into the magnet groove 22, achieving a clearance fit between the magnet 10 and the magnet groove 22.

[0070] The notch 221 can be recessed into the side wall of the magnet groove 110. At least one of the opposite side walls of the magnet groove 22 is provided with the notch 221. When only one side wall is provided with the notch 221 and the spring piece 23, and the other side wall is not provided with the notch 221 and the spring piece 23, the effective contact area between the magnet 10 and the magnet groove 22 can be guaranteed to achieve a combination of pressing and support, and ensure the stability of the magnet 10 in the magnet groove 22.

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

[0072] Furthermore, in one embodiment, at least a portion of the fan-shaped portion has a clearance groove 222 on the side wall facing the magnet slot 22. The clearance groove 222 corresponds to the notch 221 on the axially adjacent rotor lamination 21. In this way, clearance space is provided on the upper and lower sides of the spring piece 23 in the axial direction of the rotor core 20, so that when the magnet 10 is inserted into the magnet slot 22, the spring piece 23 is compressed and reliably bent and deformed. At the same time, the risk of interference between the spring piece 23 and the adjacent rotor lamination 21 is reduced.

[0073] Specifically, such as Figure 4 and Figure 6 As shown, a plurality of notched slots 221 and a plurality of clearance slots 222 are alternately arranged on a rotor lamination 21 to be evenly distributed in the circumference of the rotor lamination 21. This helps to balance the structure of the rotor lamination 21, ensure the stability of the rotor lamination 21, and also facilitates batch processing and stacking of multiple rotor laminations 21.

[0074] Of course, since the rotor core 20 includes multiple rotor laminations 21, the specific structure of each rotor lamination 21 can be completely the same or partially the same. Under the condition of ensuring the assembly between the magnet 10 and the rotor core 20, one or more types of rotor laminations 21 can be stacked to form the rotor core 20 and form the corresponding magnet slots 22, which helps to improve the diversity of the rotor core 20.

[0075] Reference Figure 7 In one embodiment, multiple rotor laminations 21 are stacked by rotating alternately by a mechanical angle θ, and θ = 360° / P; the number of magnet slots 22 is P, P = 12 ± k * 2, where k is 1 or 2.

[0076] Understandably, multiple notches 221 and multiple clearance slots 222 are alternately arranged on the rotor laminations 21. Thus, when the rotor laminations 21 are stacked layer by layer, each layer of rotor laminations 21 needs to be rotated by a mechanical angle θ so that the notches 221 of the upper rotor laminations 21 correspond to the clearance slots 222 of the lower rotor laminations 21. The spring piece 23 is provided in conjunction with the notches 221 to ensure reliable deformation of the spring piece 23 when the magnet 1 is inserted, ensuring the reliability of the rotor core 20 in limiting the magnet 10. In this way, it effectively avoids the generation of noise caused by the resonance of the magnet 10 with the magnetic field when the motor is running at high frequency, and the damage caused by the collision between the magnet 10 and the rotor core 20, thereby improving the working efficiency and service life of the motor.

[0077] Wherein, θ=360° / P, and P is the total number of slots 22 of the magnet slots 22 on the rotor lamination 21; by limiting the mechanical angle, on the one hand, it is convenient to set the rotation angle of the stamping equipment (stamping head) during the forming of the magnet slot 22, and the processing of the magnet slot 22 is completed at this angle, which helps to improve the processing efficiency; on the other hand, it is convenient to rotate the mechanical angle when stacking each rotor lamination 21, so that the notch slot 221 and the clearance slot 222 of the two adjacent rotor laminations 21 can be aligned, thereby improving the alignment accuracy and alignment efficiency.

[0078] Furthermore, the number P of the magnetic slots 22 satisfies: P = 12 ± k * 2, where k is 1 or 2. This means the stator and rotor have 12 stator slots with 12 ± k * 2 rotor poles, ensuring reliable operation of the motor and improving its power and efficiency. For example, with 12 stator slots, k equals 1; or k equals 2. When k equals 1, the rotor poles can be 10 or 14; when k equals 2, the rotor poles can be 8 or 16. Of course, the number of stator slots can be other values, in which case the rotor poles will change accordingly to meet user requirements.

[0079] Reference Figure 5 In one embodiment, the outer periphery of the inner ring portion 212 is provided with the spring piece 23. The spring piece 23 extends radially along the rotor lamination 21, that is, the spring piece 23 protrudes from the inner ring portion 212 and is set in relation to the gap between two adjacent fan-shaped portions 211. In this way, when the magnet 10 extends into the magnet groove 22, the magnet 10 can squeeze the spring piece 23, causing the spring piece 23 to be deformed under pressure. Then, the spring piece 23 provides elastic pressure to the magnet 10, realizing the tight fixation of the magnet 10 in the magnet groove 22. With the cooperation of the spring piece 23 on the fan-shaped portion 211, the connection stability between the magnet 10 and the rotor core 20 can be further improved.

[0080] Optionally, in one embodiment, at least a portion of the sector portion 211 is connected to the inner ring portion 212 to ensure the integrity of the sector portion 211 and the inner ring portion 212, which facilitates the rotation and stacking of each rotor lamination 21 in the later stage and improves assembly efficiency.

[0081] Optionally, in one embodiment, two adjacent sector portions 211 are disconnected on the side opposite to the inner ring portion 212, such as... Figure 4 As shown, each sector 211 is relatively independent and is arranged at intervals along the circumference of the inner ring 212 to form a semi-connected magnetic bridge lamination. While facilitating the insertion of the magnet 10 into the magnet slot 22, it can reduce the amount of material used in the rotor lamination 21. At the same time, it can prevent the magnet slot 22 from deforming due to long-term alternating force, which helps to improve the service life of the rotor lamination 21 and the fitting accuracy between the rotor lamination 21 and the magnet 10.

[0082] In another embodiment, the sides of two adjacent sector portions 211 facing away from the inner ring portion 212 are connected by a bridge, such as... Figure 6 As shown, the sides of each sector 211 facing away from the inner ring 212 are connected in pairs by a connecting bridge to form a fully connected magnetic bridge lamination 24. This enhances the structural strength and stability of the rotor lamination 21, thereby improving the overall strength and stability of the rotor core 20. However, in other embodiments, on the rotor lamination 21, some adjacent sectors 211 are connected to each other on the sides facing away from the inner ring 212, while some adjacent sectors 211 are disconnected on the sides facing away from the inner ring 212.

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

[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 provided in a magnet slot 22. When there are two sections of magnet 10, the two sections of magnet 10 are inserted into the magnet slot 22 from both ends of the rotor core 20 respectively. After the two magnets 10 are inserted into the magnet slot 22, the deformation directions of the two spring pieces 23 are opposite.

[0085] Reference Figure 3 In one embodiment, the rotor further includes end plates 30, which are located axially on the rotor core 20 and connected to the rotor core via fasteners. When two end plates 30 are provided, respectively located at both ends of the rotor core 20, the rotor core 20 and the magnet 10 are clamped between the two end plates 30. This helps protect the rotor core 20 and the magnet 10, effectively preventing the magnet 10 from detaching from the rotor core 20 axially, thus improving the connection strength between the rotor core 20 and the magnet 10. Furthermore, the end plates 30 increase the rotor's weight, which helps increase the rotor's moment of inertia and ensures stable rotation. The axial direction of the rotor core 20 is the thickness direction of the magnet 10.

[0086] Specifically, the thickness of the end plate 30 is H, and the total radial length of the magnet 10 is D, where D / B ≤ H ≤ D / A, and B = B1 ≥ B2, or B = B2 ≥ B1. In essence, the thickness of the end plate 30 is determined based on the specific dimensions of the rotor. By limiting D / B ≤ H ≤ D / A, it effectively avoids the end plate 30 being too thick, resulting in lower magnetic permeability compared to rotors of the same weight, thus affecting the rotor's anti-demagnetization performance and normal operation. The radial direction specifically refers to the radial direction of the rotor core 20.

[0087] Reference Figure 4 In one embodiment, the rotor lamination 21 is provided with rivet holes 213 and / or rivet holes 214 spaced apart along its circumference for connecting adjacent stacked rotor laminations 21. It is understood that the rotor lamination 21 may simultaneously be provided with rivet holes 213 and rivet holes 214, specifically on the fan-shaped portion 211. During assembly, the rivet holes 213 are used to connect adjacent stacked fan-shaped portions 211, and the connection between the fan-shaped portion 211 and the inner ring portion 212 reliably ensures a stable connection between each rotor lamination 21, forming the rotor core 20. Based on this, rivet holes 214 penetrating the end plate 30 and the rotor core 20 can be provided, and fasteners such as rivets 40 can be inserted into the rivet holes 214. 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 magnet 10 detaching from the rotor core 20, and at the same time improving the overall assembly reliability of the rotor.

[0088] Multiple rivet holes 213 can be provided, of which at least two can be provided on the fan-shaped portion 211. Furthermore, the rivet hole 214 is located between the two rivet holes 213, with one rivet hole 213 close to the inner ring portion 212 and the other rivet hole 213 far away from the inner ring portion 212, which helps to improve the connection reliability and connection stability between each rotor lamination 21.

[0089] The present invention also proposes an electric motor, which includes a rotor. The specific structure of the rotor is as described in the above embodiments. Since the rotor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0090] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since the compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0091] In this embodiment, the compressor can be a DC inverter compressor. By using the rotor with the above-mentioned magnet 10 and rotor core 20, it is helpful to reduce the manufacturing process and accessories of the motor, enhance the stability of the magnet 10, improve the reliability of the compressor, and reduce the overall cost of the product.

[0092] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A rotor, characterized in that, include: The rotor core includes multiple rotor laminations, which are stacked and form magnetic slots. Multiple magnetic slots are arranged at intervals along the circumference of the rotor laminations. Multiple magnets are provided and are installed in each of the magnet slots; The magnet includes a main body, a first anti-demagnetization part and a second anti-demagnetization part 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, and the width of the second anti-demagnetization part is B2, and A < B1 and A < B2.

2. The rotor as claimed in claim 1, characterized in that, The length of the main body is C, the total length of the magnet 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 either the width of the first anti-demagnetization part or the width of the second anti-demagnetization part.

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

2.

4. The rotor as described in claim 3, characterized in that, The first transition portion is provided with a first inclined surface, the first inclined angle of the first inclined surface is J1, and the second transition portion is provided with a second inclined surface, the second inclined angle of the second inclined surface is 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 as claimed in claim 1, characterized in that, The magnet is a ferrite magnet; And / or, in the thickness direction of the magnet, the edge of the end face of the magnet is chamfered.

6. The rotor as claimed in claim 1, characterized in that, A gap W is provided between the magnet and the magnet groove, where 0.05mm≤W≤0.15mm.

7. The rotor as claimed in claim 1, characterized in that, The rotor lamination includes an inner ring portion and a plurality of sector portions distributed around the axis of the inner ring portion, and the magnetic groove is formed between two adjacent sector portions and the inner ring portion; In this embodiment, at least a portion of the magnet groove has a spring piece on its sidewall, the top of the spring piece extending into the magnet groove, and the top of the spring piece abutting against the sidewall of the magnet to fix the magnet.

8. The rotor as claimed in claim 7, characterized in that, At least a portion of the fan-shaped portion has a notch on the side wall facing the magnet groove, and the spring piece is provided in the notch, the spring piece extending from the bottom of the notch towards the groove opening.

9. The rotor as claimed in claim 8, characterized in that, At least a portion of the fan-shaped portion has a clearance groove on its side wall facing the magnet slot, and the clearance groove corresponds to the notch groove on the rotor lamination adjacent in the axial direction.

10. The rotor as claimed in claim 9, characterized in that, The rotor lamination is provided with a plurality of notched slots and a plurality of clearance slots alternately.

11. The rotor as claimed in claim 10, characterized in that, Multiple rotor laminations are stacked by rotating alternately by a mechanical angle θ, where θ = 360° / P; The number of magnetic steel slots is P, where P = 12 ± k * 2, and k is 1 or 2.

12. The rotor as claimed in claim 7, characterized in that, The outer periphery of the inner ring is provided with the spring piece, which extends radially along the rotor lamination.

13. The rotor as claimed in claim 7, characterized in that, At least a portion of the sector portion is connected to the inner ring portion; and / or, The two adjacent sector portions are disconnected on the side away from the inner ring portion; and / or, The two adjacent sector portions are connected by a bridge on the side away from the inner ring portion.

14. The rotor as claimed in claim 7, characterized in that, The rotor also includes an end plate located axially above the rotor core and connected to the rotor core by fasteners.

15. An electric motor, characterized in that, Includes a rotor as described in any one of claims 1 to 14.

16. A compressor, characterized in that, Includes the motor as described in claim 15.

Images