Rotor, motor, compressor and refrigeration equipment

Abstract

The utility model discloses a rotor, a motor, a compressor and refrigeration equipment, and relates to the technical field of permanent magnet motors for compressors, the rotor comprises a rotor core and a plurality of permanent magnets; the plurality of permanent magnets are arranged on the rotor core, and on the axial projection of the rotor, at least one permanent magnet comprises a first magnetic block and a second magnetic block which are respectively distributed at two ends, and a middle magnetic part which is arranged in the middle; wherein the intrinsic coercive force of the first magnetic block and the intrinsic coercive force of the second magnetic block are Hcj1 and Hcj2 respectively, the intrinsic coercive force of the middle magnetic part is Hcj3, and Hcj1 / Hcj3 is larger than or equal to 1.03 and smaller than or equal to 1.25, and Hcj2 / Hcj3 is larger than or equal to 1.03 and smaller than or equal to 1.25. The technical scheme provided by the utility model aims to improve the demagnetization resistance of the permanent magnet, reduce the eddy-current loss of the permanent magnet, and improve the efficiency of the motor so as to reduce the cost of the motor.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to a rotor, motor, compressor and refrigeration equipment. Background Technology

[0002] Electric motors are widely used in industry and daily life, and the requirements for motor efficiency are becoming increasingly stringent. For various products that utilize electric motors, such as compressors, the efficiency of the permanent magnet and heat generation issues affect motor performance, leading to a continuous increase in motor costs. Utility Model Content

[0003] The main purpose of this invention is to provide a rotor, motor, compressor, and refrigeration equipment, which aims to improve the demagnetization resistance of permanent magnets, reduce the eddy current losses of permanent magnets, and improve the efficiency of motors to reduce motor costs.

[0004] To achieve the above objectives, the rotor proposed in this utility model includes:

[0005] Rotor core; and

[0006] Multiple permanent magnets are disposed on the rotor core. On the axial projection of the rotor, at least one of the permanent magnets includes a first magnetic block and a second magnetic block respectively distributed at both ends, and a central magnetic part disposed in the middle.

[0007] The intrinsic coercivity of the first magnetic block and the second magnetic block are Hcj1 and Hcj2, respectively, and the intrinsic coercivity of the middle magnetic part is Hcj3, satisfying: 1.03≤Hcj1 / Hcj3≤1.25, 1.03≤Hcj2 / Hcj3≤1.25.

[0008] In one embodiment, Hcj1 and Hcj2 satisfy: 0.9≤Hcj1 / Hcj2≤1.1.

[0009] In one embodiment, the widths of the first magnetic block and the second magnetic block perpendicular to the magnetization direction are b1 and b2, respectively, satisfying: 0.8≤b1 / b2≤1.2.

[0010] In one embodiment, the widths of the first magnetic block, the second magnetic block, and the middle magnetic part perpendicular to the magnetization direction are b1, b2, and b3, respectively, satisfying: 2.5mm≤b1≤1.5×b3mm, 2.5mm≤b2≤1.5×b3mm.

[0011] In one embodiment, Hcj1, Hcj2, and Hcj3 satisfy the following conditions: 1700kA / m≤Hcj1≤2100kA / m, 1700kA / m≤Hcj2≤2100kA / m, and 1700kA / m≤Hcj3≤2000kA / m.

[0012] In one embodiment, the number of poles of the rotor is p, the thickness of the permanent magnet in the magnetization direction is Hm (in mm), and the unit of Hcj3 is kA / m, satisfying: 18.36kA≤p×Hm×Hcj3 / 1000≤57.33kA.

[0013] In one embodiment, on the axial projection plane of the rotor, the first magnetic block, the middle magnetic part, and the second magnetic block are sequentially connected by adhesive bonding.

[0014] In one embodiment, the central magnetic part is configured as at least one magnetic block.

[0015] In one embodiment, the permanent magnet is arranged in a V-shape, U-shape, or I-shape corresponding to the magnetic poles of the rotor.

[0016] This utility model also proposes an electric motor, including the rotor as described above.

[0017] This utility model also proposes a compressor, including the rotor as described above.

[0018] This utility model also proposes a refrigeration device, including a motor as described above, or a compressor as described above.

[0019] In the technical solution of this utility model, taking the axial projection plane of the rotor as a reference, the permanent magnet on the rotor is divided into a first magnetic block, a second magnetic block, and a middle magnetic part at the ends. The first magnetic block and the second magnetic block are respectively connected to the opposite ends of the middle magnetic part. The boundary between the first magnetic block, the middle magnetic part, and the second magnetic block will block the originally continuous eddy current path, reduce the effective area where eddy currents can form in the permanent magnet, thereby reducing the intensity of eddy current generation and thus reducing the eddy current loss of the permanent magnet. Furthermore, the intrinsic coercivity of the first magnetic block and the second magnetic block is greater than that of the middle magnetic part, and the ratio is kept between 1.03 and 1.25. The protection formed by the first magnetic block and the second magnetic block on the middle magnetic part can resist the influence of various demagnetizing factors, thereby ensuring the anti-demagnetizing ability of the entire permanent magnet, thereby improving the motor efficiency, and achieving motor efficiency with a lower-cost permanent magnet, that is, reducing the cost of the motor. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of an embodiment of the rotor provided by this utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the permanent magnet;

[0023] Figure 3 A schematic diagram of another embodiment of the rotor provided by this utility model;

[0024] Figure 4 A schematic diagram of another embodiment of the rotor provided by this utility model;

[0025] Figure 5 A schematic diagram of the structure of an embodiment of the motor provided by this utility model;

[0026] Figure 6 A schematic diagram of the structure of an embodiment of the compressor provided by this utility model;

[0027] Figure 7 A schematic diagram comparing the efficiency of the motor provided by this utility model with that of existing motors;

[0028] Figure 8 A schematic diagram comparing the COP of the compressor provided by this utility model and the compressors of the prior art.

[0029] Explanation of icon numbers:

[0030] 100. Rotor; 110. Rotor core; 111. Permanent magnet slot; 120. Permanent magnet; 121. First magnetic block; 122. Second magnetic block; 123. Middle magnetic section; 130. Magnetic isolation slot; 140. Rivet hole; 150. Rotor shaft hole; 160. Flow hole;

[0031] 200, Stator; 210, Stator core; 220, Winding; 300, Pump body; 400, Liquid storage tank.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0034] It should be noted that if the embodiments of this utility model 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 specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model 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 use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. 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 utility model.

[0036] In existing technologies, permanent magnets in electric motors experience eddy current losses during operation, leading to heat generation and energy loss, thus reducing motor efficiency. Simultaneously, the permanent magnets demagnetize due to high temperatures or strong reverse magnetic fields from the stator, resulting in a weakened air gap magnetic field and reduced motor output torque, further decreasing efficiency. Correspondingly, existing technologies increase permanent magnet thickness or use high-coercivity materials to improve efficiency, but this increases motor cost.

[0037] This utility model proposes a rotor 100.

[0038] Please refer to Figures 1 to 5 , Figure 7 In one embodiment of the present invention, the rotor 100 includes:

[0039] Rotor core 110; and

[0040] Multiple permanent magnets 120 are disposed on the rotor core 110. On the axial projection of the rotor 100, at least one permanent magnet 120 includes a first magnetic block 121 and a second magnetic block 122 respectively distributed at both ends, and a central magnetic part 123 disposed in the middle.

[0041] The intrinsic coercivity of the first magnetic block 121 and the second magnetic block 122 are Hcj1 and Hcj2, respectively, and the intrinsic coercivity of the middle magnetic part 123 is Hcj3, satisfying: 1.03≤Hcj1 / Hcj3≤1.25, 1.03≤Hcj2 / Hcj3≤1.25.

[0042] In the technical solution of this utility model, taking the axial projection plane of the rotor 100 as a reference, the permanent magnet 120 on the rotor 100 is divided into a first magnetic block 121, a second magnetic block 122, and a middle magnetic part 123 at the ends. The first magnetic block 121 and the second magnetic block 122 are respectively connected to the opposite ends of the middle magnetic part 123. The boundary between the first magnetic block 121, the middle magnetic part 123, and the second magnetic block 122 will block the originally continuous eddy current path, reduce the effective area where eddy currents can be formed in the permanent magnet 120, and thus reduce the intensity of eddy current generation. This reduces the eddy current loss of the permanent magnet 120. Furthermore, the intrinsic coercivity of the first magnetic block 121 and the second magnetic block 122 is greater than that of the middle magnetic part 123, and the ratio is kept between 1.03 and 1.25. The protection formed by the first magnetic block 121 and the second magnetic block 122 on the middle magnetic part 123 can resist the influence of various demagnetizing factors, thereby ensuring the demagnetizing resistance of the entire permanent magnet 120, thereby improving the motor efficiency, and achieving motor efficiency with a lower cost permanent magnet 120, which also reduces the cost of the motor.

[0043] It should be noted that the materials of the first magnetic block 121, the second magnetic block 122, and the middle magnetic part 123 can be the same or different. They are usually one of the following: AlNiCo permanent magnet alloy, IronChromiumCo permanent magnet alloy, rare earth permanent magnet material, or composite permanent magnet material. For example, the first magnetic block 121 and the second magnetic block 122 are made of AlNiCo permanent magnet alloy, and the middle magnetic part 123 is made of rare earth permanent magnet material. Or, the first magnetic block 121 is made of AlNiCo permanent magnet alloy, the second magnetic block 122 is made of IronChromiumCo permanent magnet alloy, and the middle magnetic part 123 is made of rare earth permanent magnet material. Correspondingly, the intrinsic coercivity of the first magnetic block 121 and the second magnetic block 122 can be the same or differ depending on the installation posture of the permanent magnet 120. However, the ratio of the intrinsic coercivity of the first magnetic block 121 and the second magnetic block 122 to the intrinsic coercivity of the central magnetic part 123 remains between 1.03 and 1.25, such as Hcj1 / Hcj3 being 1.15 and Hcj2 / Hcj3 being 1.2, or Hcj1 / Hcj3 being... 1.1, Hcj2 / Hcj3 is 1.1, or, Hcj1 / Hcj3 is 1.03, Hcj2 / Hcj3 is 1.09, or, Hcj1 / Hcj3 is 1.13, Hcj2 / Hcj3 is 1.18, or, Hcj1 / Hcj3 is 1.2, Hcj2 / Hcj3 is 1.03, or, Hcj1 / Hcj3 is 1.25, Hcj2 / Hcj3 is 1.25, etc.

[0044] Regarding the intermediate magnetic section 123, it can be a single magnetic block or multiple magnetic blocks integrated together. When the intermediate magnetic section 123 is integrated with multiple magnetic blocks, the multiple magnetic blocks can be distributed in parallel or intersecting directions along the distribution directions of the first magnetic block 121 and the second magnetic block 122. The description of the relative positions of the first magnetic block 121, the intermediate magnetic section 123, and the second magnetic block 122 is based on the axial projection plane of the rotor 100, that is, a cross-section of the rotor 100 formed by making a tangent along the radial direction of the rotor 100. The distribution of the first magnetic block 121, the intermediate magnetic section 123, and the second magnetic block 122 of the permanent magnet 120 is based on the cross-section of the rotor 100. Correspondingly, based on this projection surface, the sizes of the first magnetic block 121, the middle magnetic part 123, and the second magnetic block 122 can be consistent or different. For example, in the magnetization direction of the permanent magnet 120, the sizes of the first magnetic block 121, the middle magnetic part 123, and the second magnetic block 122 can be consistent, or the sizes of the first magnetic block 121 and the second magnetic block 122 can be larger than the size of the middle magnetic part 123. Alternatively, in the direction perpendicular to the magnetization direction of the permanent magnet 120, the sizes of the first magnetic block 121 and the second magnetic block 122 can be consistent with the size of the middle magnetic part 123, or the sizes of the first magnetic block 121 and the second magnetic block 122 can be larger than the size of the middle magnetic part 123.

[0045] like Figure 7As shown, compared to the existing permanent magnet 120 being set as an integral structure, the Hcj1 / Hcj3 and Hcj2 / Hcj3 of this technical solution are limited to between 1.03 and 1.25. When the corresponding motor speed is 30 rpm, the efficiency of the existing motor is 91.5%, and the efficiency of the motor in this technical solution is 91.8%. When the corresponding motor speed is 60 rpm, the efficiency of the existing motor is 93.9%, and the efficiency of the motor in this technical solution is 94.5%. When the corresponding motor speed is 90 rpm, the efficiency of the existing motor is 91.8%, and the efficiency of the motor in this technical solution is 92.4%.

[0046] In this technical solution, the permanent magnet 120 is divided into a first magnetic block 121, a middle magnetic part 123 and a second magnetic block 122 along the direction perpendicular to the magnetization direction. From the perspective of reducing the eddy current loss of the permanent magnet 120, the current path that could form a large annular eddy current in the whole permanent magnet 120 is cut off by the boundary of the magnetic block after being divided into blocks, thereby reducing the equivalent inductance. Under the induced electromotive force caused by the same alternating magnetic field, the reduction of inductance means that the rate of change of current will be reduced, thereby limiting the generation of eddy current and further reducing eddy current loss. Correspondingly, the first magnetic block 121 and the second magnetic block 122 are located at the ends of the permanent magnet 120 in the magnetization direction, and the intrinsic coercivity at these ends is greater than that of the central magnetic part 123. Therefore, the magnetic field strength in the end region is relatively high and more stable. Under the action of an alternating magnetic field, the changes in the magnetic field are more concentrated near the ends, rather than being uniformly distributed throughout the entire permanent magnet 120. This reduces the possibility of generating large eddy currents in other areas of the permanent magnet 120, and the rate of change of the magnetic field is relatively smaller in non-end regions, thus reducing eddy current losses accordingly. Similarly, the larger intrinsic coercivity of the first magnetic block 121 and the second magnetic block 122 can create stronger anti-interference capabilities at the ends, suppressing the generation of end eddy currents, thereby playing a positive role in reducing eddy current losses throughout the permanent magnet 120. From the perspective of the demagnetization resistance of the permanent magnet 120, after the permanent magnet 120 is divided into the first magnetic block 121, the middle magnetic part 123 and the second magnetic block 122, the demagnetization phenomenon will not spread as rapidly as in the whole permanent magnet 120. The risk of demagnetization is distributed to the first magnetic block 121, the middle magnetic part 123 and the second magnetic block 122, which reduces the possibility of severe demagnetization of the whole permanent magnet 120. At the same time, the first magnetic block 121, the middle magnetic part 123 and the second magnetic block 122 cooperate with each other and can better maintain the integrity of the magnetic circuit when facing external interference such as reverse magnetic field, thereby improving the demagnetization resistance of the permanent magnet 120. In addition, the first magnetic block 121 and the second magnetic block 122 have large intrinsic coercivity, that is, good anti-demagnetization ability, forming end protection for the permanent magnet 120, thereby effectively limiting the distortion of the magnetic field of the permanent magnet 120, avoiding the overall imbalance of the magnetic field of the permanent magnet 120 caused by external interference, and thus improving the anti-demagnetization ability of the permanent magnet 120.

[0047] In one embodiment, please refer to Figure 1 and Figure 2 Hcj1 and Hcj2 satisfy the condition: 0.9 ≤ Hcj1 / Hcj2 ≤ 1.1. This means that when Hcj1 / Hcj2 is between 0.9 and 1.1, the magnetic properties of the first magnetic block 121 and the second magnetic block 122 are relatively similar. In other words, the magnetism at both ends of the permanent magnet 120 is relatively similar, resulting in a more uniform magnetic field distribution at the ends of the permanent magnet 120. This avoids localized weak areas caused by excessive differences in the magnetic field at the ends. When facing external demagnetizing factors, the uniform magnetic field can work together to resist interference, improving the overall demagnetizing resistance of the permanent magnet 120. Furthermore, the permanent magnet 120 does not require materials with excessively large differences in intrinsic coercivity between the first magnetic block 121 and the second magnetic block 122. This avoids selecting special, expensive permanent magnet materials to meet excessively high intrinsic coercivity requirements at a particular end. Instead, materials with a more balanced performance and cost can be selected, making material utilization more rational and reducing the cost of the motor. Furthermore, the first magnetic block 121 and the second magnetic block 122 use materials with similar intrinsic coercivity ratios, simplifying the manufacturing and assembly process and further reducing the cost of the motor. Of course, in other embodiments, the values ​​of Hcj1 / Hcj2 can be limited to between 1.1 and 1.22, or between 0.83 and 0.9, depending on the specifications of the motor and the environment.

[0048] In one embodiment, please refer to Figures 1 to 3 The widths of the first magnetic block 121 and the second magnetic block 122 perpendicular to the magnetization direction are b1 and b2, respectively, satisfying: 0.8 ≤ b1 / b2 ≤ 1.2. It should be noted that on the axial projection plane of the rotor 100, the widths of the first magnetic block 121 and the second magnetic block 122 perpendicular to the magnetization direction are... Figures 1 to 3 The dimensions along the length direction as shown in the diagram, thus limiting b1 / b2 to between 0.8 and 1.2, ensures that the dimensions of the first magnetic block 121 and the second magnetic block 122 are relatively close in this direction. During manufacturing and assembly, more universal connecting components and assembly processes can be used, eliminating the need for excessive effort to adjust the relative positions of the first magnetic block 121, the second magnetic block 122, and the central magnetic part 123. This reduces operational complexity during assembly, improves assembly efficiency, and lowers the difficulty of connection and assembly. Simultaneously, the tools used to install the first magnetic block 121 and the second magnetic block 122 are more versatile, eliminating the need to customize special connecting components to accommodate the significant width differences between the first and second magnetic blocks 121 and 122, thereby reducing processing costs. Of course, in other embodiments, the b1 / b2 value of the first magnetic block 121 and the second magnetic block 122 can be set to be less than 0.8 or greater than 1.2, depending on the specifications of different motors and the environment.

[0049] In one embodiment, please refer to Figure 1 and Figure 2 The widths of the first magnetic block 121, the second magnetic block 122, and the middle magnetic part 123 perpendicular to the magnetization direction are b1, b2, and b3, respectively, satisfying: 2.5mm≤b1≤1.5×b3mm, 2.5mm≤b2≤1.5×b3mm. The descriptions of the magnetization direction and perpendicular to the magnetization direction are the same as those in the above technical solution and will not be repeated here. Limiting b1 or b2 to greater than or equal to 2.5mm ensures that the magnetic field of the first magnetic block 121 and the second magnetic block 122 meets the requirements and avoids the first magnetic block 121, the middle magnetic part 123 and the second magnetic block 122 having small dimensions perpendicular to the magnetization direction, thereby reducing the difficulty of assembling and connecting to form the permanent magnet 120. Additionally, limiting b1 / b3 or b2 / b3 to less than or equal to 1.5 ensures that the width difference between the first magnetic block 121 or the second magnetic block 122 and the middle magnetic part 123 in the perpendicular to the magnetization direction is small. When connecting and assembling to form the permanent magnet 120, the stress at the connection interface can be distributed more evenly. At the same time, it also avoids the first magnetic block 121 and the second magnetic block 122 having excessively large dimensions in this direction. Within a reasonable range of demagnetization resistance, the cost of the permanent magnet 120 can be reduced, thereby reducing the cost of the motor. Among them, b1 or b2 can be 2.5mm, 3mm, 4mm or 5mm, and the corresponding b3 can be 1.7mm, 2mm, 2.7mm or 3.33mm.

[0050] In one embodiment, for reference Figure 2Hcj1, Hcj2, and Hcj3 satisfy the following conditions: 1700kA / m ≤ Hcj1 ≤ 2100kA / m, 1700kA / m ≤ Hcj2 ≤ 2100kA / m, and 1700kA / m ≤ Hcj3 ≤ 2000kA / m. It can be understood that the intrinsic coercivity of the first magnetic block 121 and the second magnetic block 122 is limited to between 1700kA / m and 2100kA / m, and the intrinsic coercivity of the middle magnetic part 123 is limited to between 1700kA / m and 2000kA / m. Each part of the permanent magnet 120 has a certain resistance to demagnetization. When the motor faces the risk of demagnetization, the permanent magnet 120 can maintain its magnetism, ensuring the normal operation of the motor. Meanwhile, the intrinsic coercivity of the first magnetic block 121, the second magnetic block 122, and the middle magnetic part 123 are all within a reasonable range. They can work together to resist demagnetization, and the weak demagnetization resistance of any one part will not become a weak link in the overall demagnetization resistance of the permanent magnet 120, thereby improving the overall demagnetization resistance of the permanent magnet 120. In addition, by limiting the intrinsic coercivity of the first magnetic block 121, the second magnetic block 122, and the middle magnetic part 123 to a given range, it is not necessary to use permanent magnet materials with excessively high intrinsic coercivity. In this way, it is ensured that the permanent magnet 120 has sufficient demagnetization resistance to meet the operating requirements of the motor, while avoiding the increased cost caused by excessively pursuing high intrinsic coercivity. Wherein, Hcj1 or Hcj2 can be 1700kA / m, 1800kA / m, 1900kA / m, 2000kA / m, or 2100kA / m, etc., and Hcj3 can be 1700kA / m, 1800kA / m, 1900kA / m, or 2000kA / m, etc. Of course, in other embodiments, Hcj1 and Hcj2 can be limited to less than 1700kA / m or greater than 2100kA / m, or Hcj3 can be limited to less than 1700kA / m or greater than 2000kA / m, depending on the specifications of the motor and the environment.

[0051] In one embodiment, please refer to Figure 1 , Figures 3 to 5The rotor 100 has 'p' poles, and the permanent magnet 120 has a thickness of 'Hm' in the magnetization direction (in mm). The unit of Hcj3 is kA / m, satisfying the condition: 18.36kA ≤ p × Hm × Hcj3 / 1000 ≤ 57.33kA. It should be noted that a larger thickness of the permanent magnet 120 in the magnetization direction allows it to store more magnetic energy after magnetization. When affected by demagnetization factors, it has more magnetic energy reserves to maintain its magnetism, thus improving its demagnetization resistance. The intrinsic coercivity of the middle magnet section 123 is a parameter that is less affected by or is the primary parameter for demagnetization resistance of the permanent magnet 120. A thicker permanent magnet 120 can store more magnetic energy after magnetization, and when affected by demagnetization factors, it has more magnetic energy reserves to maintain its magnetism, thus improving the motor's demagnetization resistance. Thus, by limiting p×Hm×Hcj3 / 1000 to between 18.36kA and 57.33kA, the permanent magnet 120 can maintain a relatively stable magnetic field state during motor operation, effectively resisting demagnetization caused by external factors such as high temperature and reverse magnetic fields. Simultaneously, this ensures that the parameters of the permanent magnet 120 are balanced, avoiding waste in any single performance aspect and preventing unnecessary weight or volume in the motor. Furthermore, limiting the product range of the above three parameters avoids a significant increase in cost due to an unreasonable increase in any parameter, achieving cost control as much as possible while ensuring sufficient demagnetization resistance of the permanent magnet 120, thereby improving the cost-effectiveness of the motor product. The values ​​of p×Hm×Hcj3 / 1000 can be 18.36kA, 22.52kA, 30.64kA, 38.32kA, 43.66kA, 51.76kA, or 57.33kA.

[0052] Regarding the molding method of the permanent magnet 120, in one embodiment, please refer to... Figure 2 On the axial projection plane of the rotor 100, the first magnetic block 121, the middle magnetic part 123, and the second magnetic block 122 are sequentially connected by adhesive. When the first magnetic block 121, the middle magnetic part 123, and the second magnetic block 122 are connected by adhesive, the adhesive can fill the tiny gaps between the parts, making them tightly bonded together. During motor operation, this reduces the relative displacement between the magnetic blocks of the permanent magnet 120 due to factors such as vibration and magnetic field force, ensuring the stability of the overall magnetic field distribution of the permanent magnet 120. In addition, the adhesive material interrupts the conductive circuit that the permanent magnet 120 may form, making it less likely for the permanent magnet 120 to generate eddy currents under alternating magnetic fields, thereby reducing eddy current losses and improving motor efficiency. Of course, in other embodiments, the first magnetic block 121, the middle magnetic part 123, and the second magnetic block 122 can also be defined by the permanent magnet slot 111 of the rotor 100 to form the permanent magnet 120, or the connecting surfaces of adjacent ones can form a snap-fit ​​structure, thereby forming a stable permanent magnet 120.

[0053] In one embodiment, please refer to Figure 1 , Figures 3 to 5 Corresponding to the magnetic poles of rotor 100, permanent magnets 120 are arranged in a V-shape, U-shape, or I-shape. It can be understood that for a single magnetic pole position of rotor 100, when the permanent magnet 120 is arranged in a V-shape, such as... Figure 4 As shown, its magnetic field will have a focusing effect at the tip of the V-shape, thus enabling the motor to output greater torque. When the permanent magnet 120 is arranged in a U-shape, as... Figure 1 As shown, the area between the two arms of the U-shape forms a relatively enclosed magnetic field space, which enhances the magnetic field within this region, helping to increase the motor's magnetic flux and thus improve its performance. When the permanent magnet 120 is arranged in a type I configuration, as... Figure 3 As shown, it has a relatively linear distribution characteristic along its length, which makes the rotor 100 magnetic poles subject to a relatively stable magnetic field force, which helps to improve the torque stability of the motor and reduce torque fluctuations caused by uneven magnetic field.

[0054] This utility model also proposes an electric motor, which includes a rotor 100. The specific structure of the rotor 100 is as described in the above embodiments. Since this electric motor 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.

[0055] The rotor core 110 has multiple permanent magnet slots 111 distributed circumferentially, and a permanent magnet 120 is installed in one permanent magnet slot 111. The rotor core 110 is formed by stacking multiple rotor laminations along the axial direction of the rotor 100. The rotor laminations can be connected to form the rotor 100 by welding or riveting. For riveting, as shown... Figure 1 , Figures 3 to 5 As shown, the rotor laminations are provided with rivet holes 140. The rivet holes 140 are used to stack multiple rotor laminations by riveting to form a rotor core 110, thereby ensuring the structural stability of the rotor core 110. Additionally, as... Figure 1 , Figure 3 and Figure 4As shown, the rotor core 110 is also provided with a magnetic isolation groove 130. The magnetic isolation groove 130 is located on the side of the permanent magnet groove 111 away from the center of the rotor 100, and is used to guide the magnetic field formed by the permanent magnet 120, so that the magnetic field formed by the rotor 100 can be distributed according to the preset effect, thereby improving the torque output capability of the rotor 100. Without loss of generality, a rotor shaft hole 150 is provided in the middle of the rotor core 110, and a rotating shaft passes through the rotor shaft hole 150. Utilizing the kinematic coordination between the rotor 100 and the stator 200, the motor can output power to the outside through the rotating shaft in the rotor shaft hole 150. It can be seen that the rotor shaft hole 150 and the rotating shaft remain stable at least in the circumferential direction of the rotor 100. It is understood that the stator 200, which mates with the rotor 100, includes a stator core 210 and windings 220. The stator core 210 has stator slots and stator teeth arranged alternately along its circumference. The windings 220 are wound around the stator teeth and occupy the space of the stator slots. In this embodiment, the motor is configured as an internal rotor 100 motor, with a mounting hole formed at the center of the stator 200, through which the rotor 100 rotatably passes.

[0056] This utility model also proposes a compressor, which includes a rotor 100. The specific structure of the rotor 100 is as described in the above embodiments. Since this 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.

[0057] In one embodiment, please refer to Figure 1 , Figures 3 to 5 The rotor core 110 is provided with flow holes 160, through which the refrigerant in the compressor and the lubricating oil rotating on the rotor 100 are disposed together. A circulation is formed through the flow holes 160 on the rotor core 110, the gap between the stator 200 and the compressor housing, and the air gap between the stator 200 and the rotor 100. This can cool the motor and reduce the impact of eddy current losses on motor efficiency. Alternatively, the motor housing and the compressor housing can be configured as a single component to reduce the number of components inside the compressor, improving its compactness and reducing its size. Of course, in other embodiments, the motor can also be assembled and then installed on the compressor, presenting the motor with its own motor housing.

[0058] Regarding the structure of the compressor, such as Figure 6As shown, the compressor contains a rotor 100 and a stator 200, with a pump body 300 positioned below them. This pump body 300 pumps both refrigerant and lubricating oil from the compressor towards the rotor 100. The circulation of lubricating oil and the separation of refrigerant and lubricating oil into the refrigerant circuit are achieved through the flow holes 160 on the rotor core 110 and the gap between the stator 200 and the casing, thus reducing the compressor's size. Correspondingly, the compressor also includes a liquid receiver 400. The liquid receiver 400 balances the refrigerant circulation volume under different operating conditions, ensuring stable operation of the evaporator and condenser, and preventing incompletely evaporated liquid refrigerant from entering the compressor, thus avoiding liquid slugging damage to compressor components.

[0059] For compressors with rotor 100 that incorporate the aforementioned technical solution, please refer to... Figure 8 Compared to existing technologies that use integrated permanent magnets, under different SEER (Seasonal Energy Efficiency Ratio) operating conditions, the compressor COP (Cooling Capacity / Compressor Power) of this technical solution is higher than that of existing compressors.

[0060] This utility model also proposes a refrigeration device, which includes a motor or a compressor. The specific structure of the motor or compressor is as described in the above embodiments. Since this refrigeration device 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. The refrigeration device can be configured as a refrigerator, air conditioner, etc.

[0061] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A rotor, characterized in that, include: Rotor core; as well as Multiple permanent magnets are disposed on the rotor core. On the axial projection of the rotor, at least one of the permanent magnets includes a first magnetic block and a second magnetic block respectively distributed at both ends, and a central magnetic part disposed in the middle. The intrinsic coercivity of the first magnetic block and the second magnetic block are Hcj1 and Hcj2, respectively, and the intrinsic coercivity of the middle magnetic part is Hcj3, satisfying: 1.03≤Hcj1 / Hcj3≤1.25, 1.03≤Hcj2 / Hcj3≤1.

25.

2. The rotor as claimed in claim 1, characterized in that, Hcj1 and Hcj2 satisfy the condition: 0.9≤Hcj1 / Hcj2≤1.

1.

3. The rotor as described in claim 1, characterized in that, The widths of the first magnetic block and the second magnetic block perpendicular to the magnetization direction are b1 and b2, respectively, satisfying: 0.8≤b1 / b2≤1.

2.

4. The rotor as claimed in claim 1, characterized in that, The widths of the first magnetic block, the second magnetic block, and the middle magnetic part perpendicular to the magnetization direction are b1, b2, and b3, respectively, satisfying: 2.5mm≤b1≤1.5×b3mm, 2.5mm≤b2≤1.5×b3mm.

5. The rotor as claimed in claim 1, characterized in that, Hcj1, Hcj2, and Hcj3 satisfy the following conditions: 1700kA / m≤Hcj1≤2100kA / m, 1700kA / m≤Hcj2≤2100kA / m, and 1700kA / m≤Hcj3≤2000kA / m.

6. The rotor as claimed in claim 1, characterized in that, The rotor has p poles, the permanent magnet has Hm thickness in the magnetization direction (in mm), and Hcj3 has kA / m. The following condition is met: 18.36kA≤p×Hm×Hcj3 / 1000≤57.33kA.

7. The rotor as claimed in any one of claims 1 to 6, characterized in that, On the axial projection plane of the rotor, the first magnetic block, the middle magnetic part, and the second magnetic block are connected sequentially by adhesive bonding. And / or, the central magnetic part is configured as at least one magnetic block.

8. The rotor as claimed in any one of claims 1 to 6, characterized in that, Corresponding to the magnetic poles of the rotor, the permanent magnets are arranged in a V-shape, U-shape, or I-shape.

9. An electric motor, characterized in that, Includes a rotor as described in any one of claims 1 to 8.

10. A compressor, characterized in that, Includes a rotor as described in any one of claims 1 to 8.

11. A refrigeration device, characterized in that, This includes the motor as described in claim 9, or the compressor as described in claim 10.

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