Rotor assembly, motor, compressor and refrigeration equipment

Abstract

The utility model discloses a rotor assembly, a motor, a compressor and refrigeration equipment, the rotor assembly comprises a rotor body and a magnet, and the rotor body is provided with multiple poles arranged at intervals in the circumferential direction; each pole of the rotor body is provided with a magnetic steel groove, and the magnetic steel groove comprises a first groove extending perpendicular to the radius direction and second grooves located at the two ends of the first groove and extending in the direction away from the circle center in the radial direction. The magnets are respectively accommodated in the first groove and the second groove; wherein two adjacent poles on the rotor are symmetrical about the Q axis, one pole on the rotor is symmetrical about the D axis, the included angle between the D axis and the Q axis is A1, the included angle between the outer end of the second groove and the D axis is A2, and A2 / A1 is larger than or equal to 0.75 and smaller than or equal to 0.85. According to the rotor assembly provided by the utility model, the ratio of A2 to A1 is limited in the range of 0.75-0.85, so that the magnetic leakage phenomenon can be reduced, the energy conversion efficiency of the motor is improved, the magnet can be ensured to fully cover the key area of the rotor, and the output capability and the stability of the motor are maintained.

Description

Technical Field

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

[0002] In the field of motor technology, the rotor assembly, as the core component of the motor, directly affects its performance. With the rapid development of refrigeration technology and the continuous expansion of refrigeration equipment application scenarios, the performance requirements of compressor motors are increasing day by day.

[0003] In related technologies, rotor design has bottlenecks in optimizing magnetic field distribution, reducing energy loss, and improving torque output. Utility Model Content

[0004] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a rotor assembly. According to the rotor assembly of the present invention, by limiting the ratio of A2 to A1 to a range of 0.75 to 0.85, this not only helps reduce magnetic flux leakage and improves the energy conversion efficiency of the motor, but also ensures that the magnets fully cover key areas of the rotor, thereby maintaining the motor's output capacity and stability.

[0005] The utility model also provides a motor with the rotor assembly.

[0006] The utility model also provides a compressor with the motor.

[0007] The utility model also provides a refrigeration device with the compressor.

[0008] According to the present invention, the rotor assembly includes: a rotor body, which is provided with multiple poles spaced apart in the circumferential direction, and an air slot is formed between at least two adjacent poles; each pole of the rotor body is formed with a magnetic steel slot, and the magnetic steel slot includes a first slot extending perpendicular to the radial direction and a second slot located at both ends of the first slot and extending radially away from the center of the circle; a magnet, wherein the magnet is respectively accommodated in the first slot and the second slot; wherein the two adjacent poles on the rotor body are symmetrical about the Q axis, and one pole on the rotor body is symmetrical about the D axis, the angle between the D axis and the Q axis is A1, and the angle between the outer end of the second slot and the D axis is A2, and the following is satisfied: 0.75≤A2 / A1≤0.85.

[0009] In the rotor assembly of the present invention, the outer end of the second slot refers to the position of the second slot circumferentially farthest from the D-axis. The ratio of A2 to A1 is equivalent to the relative size of the circumferential area occupied by the magnet within a pole. Therefore, A2 / A1 represents the distribution of the magnets within the circumferential range of each pole.

[0010] As A2 / A1 increases, meaning the outer end of the second slot is positioned further away from the D-axis, the magnet's circumferential coverage increases accordingly. However, this increase is often accompanied by an increase in magnetic flux leakage. Magnetic flux leakage refers to the phenomenon where the magnetic field is not fully utilized to generate effective torque, but instead leaks to the motor's exterior or to non-operating areas within the motor. Increased magnetic flux leakage reduces motor efficiency because some energy is wasted in non-target areas.

[0011] Conversely, if the value of A2 / A1 is reduced, that is, the outer end of the second slot is closer to the D-axis, the circumferential coverage of the magnet will be reduced accordingly. Although this can reduce magnetic flux leakage, it may also lead to a decrease in the output capacity of the motor because the magnet cannot fully utilize the circumferential space of the rotor to generate sufficient magnetic field and torque.

[0012] By limiting the A2 / A1 ratio to 0.75 to 0.85, a balance is achieved between reducing magnetic flux leakage and maintaining motor output capacity. This range, derived from extensive experimental data and simulation analysis, is intended to ensure high motor efficiency and stable performance under a variety of operating conditions.

[0013] According to some embodiments of the present invention, a first magnet is accommodated in the first slot, and an angle A3 is formed between an end of the first magnet and the D axis and satisfies the following relationship: 0.25≤A3 / A2≤1.

[0014] According to some embodiments of the present invention, the distance between the first slot and the center of the rotor body is D1, the outer diameter of the rotor body is R1, and the following relationship is satisfied: 0.453≤D1 / R1≤0.824.

[0015] According to some embodiments of the present invention, the distance between the intersection of the outer edge of the rotor body and the Q axis and the D axis is L1, the distance between the end of the second slot and the D axis is L2, and the following relationship is satisfied: 0.75≤L2 / L1≤0.85.

[0016] According to some embodiments of the present invention, the distance between the end of the first groove and the D axis is L3 and satisfies: 0.25≤L3 / L2≤1.

[0017] According to some embodiments of the present invention, a communication port communicating with the air groove is formed on the outer edge of the rotor body.

[0018] According to some embodiments of the present invention, the outer end of the communication port extends to the outer edge of the rotor body and has a width of D2, the inner end of the communication port is connected to the air slot and has a width of D3, and satisfies: D2≤D3, 0≤d3≤R1*[acrsin(L1 / R1)-acrsin(L2 / R1)].

[0019] According to some embodiments of the present invention, the outer end of the communication port extends to the outer edge of the rotor body and has a width of D2, the inner end of the communication port is connected to the air slot and has a width of D3, and satisfies: D3≤D2, 0≤d2≤R1*[acrsin(L1 / R1)-acrsin(L2 / R1)].

[0020] In summary, according to the rotor assembly of the embodiment of the present invention, by limiting the value of A2 / A1 within the range of 0.75 to 0.85, a balance can be found between reducing leakage flux and maintaining the output capacity of the motor. The range of 0.75 to 0.85 is based on a large amount of experimental data and simulation analysis, and is intended to ensure that the motor can maintain high efficiency and stable performance under various working conditions. By limiting the value of A3 / A2 within the range of 0.25 to 1, a balance can be found between magnet utilization and eddy current loss, which not only ensures the reasonable distribution of magnets in the circumferential direction to fully utilize the magnet material and generate a uniform magnetic field, but also limits the increase of eddy current loss, thereby improving the overall efficiency and performance of the motor. By limiting the ratio of D1 to R1 within the range of 0.453 to 0.824, a balance can be found between eddy current loss and magnet utilization. The range of 0.453 to 0.824 is based on experimental and simulation analysis, and is intended to ensure that the rotor can maintain low eddy current losses to improve efficiency during operation, while fully utilizing the magnets to generate sufficient magnetic flux to meet the performance requirements of the motor.

[0021] The motor according to the present invention is briefly described below.

[0022] The motor according to the present invention includes the rotor assembly described in any of the above embodiments. Because the motor according to the present invention includes the rotor assembly described in any of the above embodiments, the motor according to the present invention significantly reduces magnetic leakage, improves energy conversion efficiency, and ensures that the magnets cover key areas, thereby enhancing the motor's output capacity and operational stability.

[0023] The following briefly describes the compressor according to the present invention.

[0024] The compressor according to the present invention includes the motor described in any one of the above embodiments. Since the compressor according to the present invention includes the motor described in any one of the above embodiments, the compressor according to the present invention achieves a lower magnetic leakage rate and a higher energy conversion efficiency, thereby improving the output power and operating stability of the compressor.

[0025] The following briefly describes the refrigeration equipment according to the present utility model.

[0026] The refrigeration device according to the present invention includes the compressor described in any of the above embodiments. Since the refrigeration device according to the present invention includes the compressor described in any of the above embodiments, the refrigeration device according to the present invention significantly improves the refrigeration efficiency by integrating a compressor with low magnetic leakage rate and high energy conversion efficiency, while also enhancing the stability and reliability of the device operation.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 1 is a schematic structural diagram of a rotor body of a rotor assembly according to an embodiment of the present utility model;

[0030] Figure 2 yes Figure 1 Another schematic structural diagram of the rotor body of the rotor assembly of the illustrated embodiment;

[0031] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0032] Reference numerals:

[0033] 1. Rotor body,

[0034] 11. Air tank;

[0035] 12, magnetic steel slot, 121, first slot, 122, second slot;

[0036] 13. China Unicom port. DETAILED DESCRIPTION

[0037] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] In related technologies, rotor design has bottlenecks in optimizing magnetic field distribution, reducing energy loss, and improving torque output.

[0041] Reference below Figure 1-Figure 3 A rotor assembly according to an embodiment of the present invention is described.

[0042] like Figure 1 As shown, the rotor assembly according to the present invention includes a rotor body 1, and the rotor body 1 is provided with multiple poles spaced apart in the circumferential direction, which helps to generate a more uniform magnetic field distribution and improve the torque density and efficiency of the motor.

[0043] An air slot 11 is formed between at least two adjacent poles. The air slot 11 not only helps to reduce the weight of the rotor and improve the dynamic balance of the rotor, but also improves the heat dissipation performance to a certain extent and reduces the impact of heat accumulation on the performance of the motor.

[0044] Each pole of the rotor body 1 is formed with a magnetic steel slot 12 for accommodating magnets. These slots include a first slot 121 extending perpendicular to the radial direction. This slot directly faces the air gap and directly influences the motor's magnetic field. Second slots 122, located at either end of the first slot 121 and extending radially away from the center, increase the flexibility of magnet arrangement, help further optimize magnetic field distribution, and reduce eddy current losses.

[0045] The rotor assembly also includes magnets, which are respectively accommodated in the first slot 121 and the second slot 122, so that the magnets can be arranged in a predetermined manner to generate a specific magnetic field distribution to generate a rotating magnetic field when the motor is running, thereby driving the rotor assembly to rotate.

[0046] The two adjacent poles on the rotor body 1 are symmetrical about the Q axis, so the magnetic field distribution of the two adjacent poles on both sides of the Q axis is mirror-symmetrical, which helps to reduce the vibration and noise of the motor and improve the operating stability of the motor.

[0047] One pole on the rotor body 1 is symmetrical about the D axis, so one pole has the same magnetic field distribution characteristics on both sides of the D axis, which helps to improve the overall performance of the motor.

[0048] The angle between the D-axis and the Q-axis is A1, and the angle between the outer end of the second slot 122 and the D-axis is A2, satisfying the following: 0.75 ≤ A2 / A1 ≤ 0.85. The outer end of the second slot 122 refers to the position of the second slot 122 circumferentially farthest from the D-axis. The ratio of A2 to A1 is equivalent to the relative size of the circumferential area occupied by the magnet within a pole. Therefore, A2 / A1 represents the distribution of the magnets within the circumferential range of each pole.

[0049] As A2 / A1 increases, meaning the outer end of the second slot 122 moves further away from the D-axis, the circumferential coverage of the magnet increases accordingly. However, this increase in coverage is accompanied by an increase in magnetic flux leakage. Magnetic flux leakage refers to the phenomenon where the magnetic field is not fully utilized to generate effective torque, but instead leaks to the outside of the motor or to non-operating areas within the motor. Increased magnetic flux leakage can lead to a decrease in motor efficiency because some energy is wasted in non-target areas.

[0050] Conversely, if the value of A2 / A1 is reduced, that is, the outer end of the second slot 122 is closer to the D-axis, the circumferential coverage of the magnet will be correspondingly reduced. Although this can reduce magnetic flux leakage, it may also lead to a decrease in the output capacity of the motor because the magnet cannot fully utilize the circumferential space of the rotor to generate sufficient magnetic field and torque.

[0051] By limiting the A2 / A1 ratio to 0.75 to 0.85, a balance is achieved between reducing magnetic flux leakage and maintaining motor output capacity. This range, derived from experimental and simulation analysis, is intended to ensure high motor efficiency and stable performance under various operating conditions.

[0052] Therefore, according to the rotor assembly of the present invention, by limiting the values ​​of A2 and A1 within the range of 0.75 to 0.85, it not only helps to reduce magnetic leakage and improve the energy conversion efficiency of the motor, but also ensures that the magnets can fully cover the key areas of the rotor, thereby maintaining the output capacity and stability of the motor.

[0053] According to some embodiments of the present invention, Figure 1 As shown, the first slot 121 contains a first magnet, and the angle between the end of the first magnet and the D axis is A3 and satisfies: 0.25≤A3 / A2≤1. The value of A3 / A2 corresponds to the relative position or proportion of the first magnet in the entire magnet distribution area in the circumferential direction.

[0054] As A3 / A2 increases, the first magnet will occupy more of the entire magnet distribution area, which means that under the same number of pole pairs, the first magnet has a wider circumferential coverage area, but correspondingly, the circumferential coverage area of ​​the magnet in the second slot 122 will be reduced, and the extension direction of the magnet in the second slot 122 will be closer to the radial direction of the rotor body 1, resulting in a certain degree of reduction in magnet utilization.

[0055] Conversely, as A3 / A2 decreases, the first magnet occupies less of the entire magnet distribution area, meaning its circumferential coverage shrinks. While magnet utilization may improve, the effect of reducing eddy current losses is weakened. Eddy current losses are caused by induced currents in the conductors surrounding the magnets. When the magnets are sparsely distributed circumferentially, the induced currents may have longer paths, increasing eddy current losses.

[0056] Therefore, by limiting the value of A3 / A2 to the range of 0.25 to 1, a balance can be found between magnet utilization and eddy current loss, which not only ensures the reasonable distribution of magnets in the circumferential direction to fully utilize the magnet material and generate a uniform magnetic field, but also limits the increase of eddy current loss, thereby improving the overall efficiency and performance of the motor.

[0057] According to some embodiments of the present invention, Figure 1 and Figure 2 As shown, the distance between the first slot 121 and the center of the rotor body 1 is D1, the outer diameter of the rotor body 1 is R1, and the following relationship is satisfied: 0.453≤D1 / R1≤0.824. The value of D1 / R1 is used to measure the position of the first slot 121 between the center and the edge of the rotor body 1.

[0058] As D1 / R1 increases, the first slot 121 will be closer to the edge of the rotor body 1, which can increase the utilization rate of the magnet because more magnetic lines of force can effectively pass through the first magnet in the first slot 121, thereby being converted into electrical energy or mechanical energy. However, this will increase eddy current loss, causing more energy to be dissipated in the form of heat energy.

[0059] As D1 / R1 decreases, the first slot 121 moves closer to the center of the rotor body 1, helping to reduce eddy current losses, as eddy currents are primarily generated at the edges of the conductor perpendicular to the magnetic field. However, this sacrifices some magnet utilization, as some of the magnetic flux generated by the magnets may not effectively pass through the conductor in the first slot 121, resulting in energy loss.

[0060] Therefore, by limiting the ratio of D1 to R1 to within the range of 0.453 to 0.824, a balance can be found between eddy current losses and magnet utilization. This range, derived from experimental and simulation analysis, aims to ensure that the rotor maintains low eddy current losses to improve efficiency while fully utilizing the magnets to generate sufficient magnetic flux to meet the motor's performance requirements.

[0061] According to some embodiments of the present invention, Figure 2 As shown, the distance between the intersection of the outer edge of the rotor body 1 and the Q axis and the D axis is L1, and the distance between the end of the second slot 122 and the D axis is L2, and they satisfy: 0.75≤L2 / L1≤0.85.

[0062] Since the distance between the intersection of the outer edge of the rotor and the Q axis and the D axis is L1, L1 is only related to the rotor radius of the rotor. In the embodiment of the present application, since the rotor radius remains unchanged on the same axis, only L2 is a variable. The shape of the magnetic steel slot 12 remains unchanged, and one pole on the rotor is symmetrical about the D axis. Therefore, L2 / L1 can be further understood as a reflection of the area of ​​the magnetic steel slot 12. The smaller the ratio of L2 / L1, the smaller the area occupied by the magnetic steel slot 12 in the area enclosed by the two Q axes. Conversely, the larger the ratio of L2 / L1, the larger the area occupied by the magnetic steel slot 12 in the area enclosed by the two Q axes.

[0063] L2 / L1 needs to be less than or equal to 0.85 because there is an air groove 11 formed between at least two adjacent poles. The function of the air groove 11 is to block the magnetic flux circulation path in the rotor core. If the air groove 11 is too small, it cannot block the magnetic flux circulation path in the rotor core, affecting the working efficiency of the motor. When the end of the second groove 122122 is close to the edge of the air groove 11 at the minimum size where the air groove 11 can take effect, the value of L2 / L1 at this time is 0.85; and L2 / L1 needs to be greater than or equal to 0.75 because if the area occupied by the magnet groove 12 in the area enclosed by the two Q axes is too small, the volume that the magnet can accommodate in this area will also decrease accordingly. The smaller magnet volume will result in insufficient magnetic field strength generated by it, and the output capacity of the motor will decrease. By limiting L2 / L1 to be greater than or equal to 0.75, the magnet groove 12 has an appropriate proportion in the area enclosed by the two Q axes, so as to accommodate a sufficient volume of magnet and ensure the generation of a strong enough magnetic field. This is beneficial to improving the torque of the motor and enabling the motor to output sufficient power during startup and operation.

[0064] According to some embodiments of the present invention, as Figure 2 shown, the distance between the end of the first groove 121 and the D axis is L3 and satisfies: 0.25 ≤ L3 / L2 ≤ 1.

[0065] It can be understood that one pole on the rotor body 1 is symmetric about the D axis. Then L3 / L2 can be understood as the opening size of the figure formed by the first groove 121 and the second groove 122. The smaller the value of L3 / L2, the larger the opening, and the larger the value of L3 / L2, the smaller the opening. When the value of L3 / L2 is 1, the shape of the magnet groove 12 is "凵" - shaped, and the second groove 122 is perpendicular to the first groove 121. Since the second groove 122 is designed radially to guide the magnetic field to the outer edge of the rotor body 1, but when L3 / L2 is greater than 1, it will show a closed - mouth state. In this case, the path for the second groove 122 to guide the magnetic field to the outer edge of the rotor body 1 will be blocked. The closed - mouth will make the magnetic field distribution in the area near the groove mouth uneven, resulting in the magnetic field being distorted and concentrated when passing through the closed - mouth part, and unable to smoothly guide along the direction of the groove to the outer edge of the rotor body 1. It will make the magnetic field strength and distribution near the outer edge of the rotor body 1 not meet the expected design requirements, unable to increase the air - gap magnetic - flux density between the rotor body 1 and the stator, and affect the performance of the motor. Therefore, L3 / L2 needs to be ensured to be less than or equal to 1.

[0066] L3 / L2 needs to be greater than or equal to 0.25 to ensure the effective length of the first magnet. If L3 / L2 is too small, the length of the first magnet will be too short, resulting in insufficient magnetic flux generated by it. Insufficient magnetic flux will directly affect the torque output capacity and overall performance of the motor. Moreover, a first magnet that is too short may not be able to effectively cooperate with the magnet in the second slot 122, destroying the integrity of the magnetic circuit, making it impossible for the distribution of the magnetic field in the magnetic steel slot 12 to reach the optimal state. Ensuring that L3 / L2 is greater than 0.25 can ensure that the first magnet has sufficient effective length, helps maintain sufficient magnetic flux, improves the torque output of the motor, and ensures that the motor can perform well under different working conditions. At the same time, sufficient length of the first magnet is conducive to building a complete and efficient magnetic circuit, making the distribution of the magnetic field in the rotor assembly more reasonable, and improving the efficiency and power density of the motor.

[0067] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, a communication port 13 communicating with the air slot 11 is formed on the outer edge of the rotor body 1 .

[0068] Because a connection port 13 is formed on the outer edge of the rotor body 1 that connects to the air slot 11, the magnetic field lines that might have previously caused magnetic leakage near the edge of the rotor body 1 now have a new flow path. Due to the distribution pattern of the magnetic field, these magnetic field lines can enter the air slot 11 through the connection port 13 instead of leaking to the outside world. This changes the distribution of the magnetic field, allowing more of the magnetic field to be confined within the rotor assembly, thereby effectively reducing magnetic leakage. Reducing magnetic leakage can increase the effective utilization of the magnetic field, thereby improving the output torque and efficiency of the motor, allowing the motor to generate more useful work at the same input power.

[0069] The presence of the connecting port 13 allows for smoother interaction between the air slot 11 and the external magnetic field. The external magnetic field can be coordinated with the magnetic field inside the rotor through the connecting port 13, thereby making the magnetic field more evenly distributed inside and outside the rotor assembly. A uniform magnetic field distribution helps reduce torque fluctuations and improve the stability of motor operation. Furthermore, the optimized magnetic field distribution can reduce situations where the local magnetic field is too strong or too weak, reduce the additional losses caused by an uneven magnetic field, and further improve the efficiency of the motor.

[0070] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, the outer end of the communication port 13 extends to the outer edge of the rotor body 1 and has a width of D2, and the inner end of the communication port 13 is connected to the air slot 11 and has a width of D3, and satisfies: D2≤D3, 0≤d3≤R1*[acrsin(L1 / R1)-acrsin(L2 / R1)].

[0071] R1×acrsin(L1 / R1) refers to the arc length corresponding to L1 at the outer edge of the rotor body 1;

[0072] R1×acrsin(L2 / R1) refers to the arc length corresponding to L2 at the outer edge of the rotor body 1;

[0073] 2×R1×[acrsin(L1 / R1)-acrsin(L2 / R1)] refers to the length between the poles;

[0074] Since D2≤D3 is satisfied, the structural design of the connecting port 13, which is narrow at the outer end and wide at the inner end, gradually constrains the magnetic field during transmission from the inner end to the outer end. This structure can better guide the magnetic field through the connecting port 13 into the air slot 11, preventing the magnetic field from leaking outward at the connecting port 13. At the same time, the restriction of 0≤D3≤2×R1×[acrsin(L1 / R1)-acrsin(L2 / R1)] ensures that the width of the inner end of the connecting port 13 is within the length range between the poles, so that the magnetic field is adjusted within a reasonable area, and the overall distribution of the magnetic field will not be destroyed due to the connecting port 13 being too large or too small. This is conducive to controlling leakage magnetic flux, making the magnetic field more concentratedly distributed in the effective area inside the rotor assembly, and improving the utilization efficiency of the magnetic field. Through this structural design, leakage magnetic flux can be effectively reduced and the output torque and efficiency of the motor can be improved.

[0075] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, the outer end of the communication port 13 extends to the outer edge of the rotor body 1 and has a width of D2, and the inner end of the communication port 13 is connected to the air slot 11 and has a width of D3, and satisfies: D3≤D2, 0≤d2≤R1*[acrsin(L1 / R1)-acrsin(L2 / R1)].

[0076] When D3≤D2, the communication port 13 presents a structure with a wide outer end and a narrow inner end, which is conducive to guiding the external magnetic field into the interior of the air slot 11 more efficiently. Since the outer end is wider, it can receive more external magnetic fields, and as the magnetic field is transmitted inward, the gradually narrowing structure can play a certain role in concentrating the magnetic field and reducing the leakage of the magnetic field during the transmission process. The same 0≤D2≤2×R1×[acrsin(L1 / R1)-acrsin(L2 / R1)] restriction ensures that the width of the outer end of the communication port 13 is within the specific arc length range between the poles, so that the guidance and concentration of the magnetic field are carried out within a reasonable spatial range, avoiding the influence of the magnetic field distribution effect due to the excessive size or small size of the communication port 13, effectively controlling the leakage magnetic field, and improving the utilization efficiency of the magnetic field, thereby increasing the output torque and efficiency of the motor.

[0077] According to some embodiments of the present application, Figure 2 and Figure 3As shown, the minimum distance between the outer edge of the air slot 11 and the center of the rotor body 1 is R2, and satisfies: 0≤R2-D1≤0.88×(R1-D1), D1≤R2.

[0078] It can be understood that R2-D1 is the distance difference between the outer edge of the first slot 121 and the air slot 11 along the radial extension direction. The smaller the distance difference, the closer the distance between the first slot 121 and the air slot 11 in the radial extension direction. Since D1≤R2, it means that the outer edge of the air slot 11 is farther away from the center of the rotor body 1 than the first slot 121. R1-D1 is the distance between the first slot 121 and the outer edge of the rotor.

[0079] When the value of R2-D1 is close to 0.88×(R1-D1), the air slot 11 has enough space in the radial extension direction to block the magnetic field. The larger air slot 11 can form a more obvious magnetic resistance, blocking the flow path of the magnetic field in the rotor core, thereby effectively blocking the magnetic field. In terms of reducing eddy currents, the larger the space of the air slot 11, the lower the degree of coupling of the magnetic field in the rotor core. According to the law of electromagnetic induction, this will reduce the generation of induced electromotive force, thereby reducing the formation of eddy currents. If R2-D1 exceeds 0.88×(R1-D1), the air slot 11 will not have enough space to effectively block the magnetic field and reduce magnetic field coupling, and the eddy current loss will increase. By limiting R2-D1 to no more than 0.88×(R1-D1), it is ensured that the air slot 11 can effectively block the magnetic field and reduce eddy currents, which helps to improve the efficiency of the motor, reduce energy loss, reduce core heating, and improve the reliability and stability of the motor.

[0080] When R2-D1 is equal to 0, the distance between the outer edge of the air slot 11 and the center of the rotor is equal to the distance between the first slot 121 and the center of the rotor. When R2-D1 ≥ 0, it is ensured that the outer edge of the air slot 11 is not closer to the center of the rotor than the first slot 121. From the perspective of space utilization, if the distance between the air slot 11 and the center of the rotor is greater than the distance between the first slot 121 and the center of the rotor, then in the limited space inside the rotor, unnecessary space will be wasted, which will weaken the strength of the rotor structure and affect the structural compactness of the entire rotor assembly. During the operation of the motor, a loose structure may lead to problems such as increased mechanical vibration and reduced fitting accuracy between components, thereby affecting the performance and reliability of the motor. By limiting R2-D1 to be greater than or equal to 0, the internal space of the rotor can be more reasonably utilized, the compactness of the structure can be maintained, and the stability of the motor operation can be improved, mechanical vibration and noise can be reduced, and the fitting accuracy between components can be improved, thereby improving the overall performance of the motor.

[0081] In summary, according to the rotor assembly of the embodiment of the present invention, by limiting the value of A2 / A1 within the range of 0.75 to 0.85, a balance can be found between reducing leakage flux and maintaining the output capacity of the motor. The range of 0.75 to 0.85 is based on a large amount of experimental data and simulation analysis, and is intended to ensure that the motor can maintain high efficiency and stable performance under various working conditions. By limiting the value of A3 / A2 within the range of 0.25 to 1, a balance can be found between magnet utilization and eddy current loss, which not only ensures the reasonable distribution of magnets in the circumferential direction to fully utilize the magnet material and generate a uniform magnetic field, but also limits the increase of eddy current loss, thereby improving the overall efficiency and performance of the motor. By limiting the ratio of D1 to R1 within the range of 0.453 to 0.824, a balance can be found between eddy current loss and magnet utilization. The range of 0.453 to 0.824 is based on experimental and simulation analysis, and is intended to ensure that the rotor can maintain low eddy current losses to improve efficiency during operation, while fully utilizing the magnets to generate sufficient magnetic flux to meet the performance requirements of the motor.

[0082] The motor according to the present invention is briefly described below.

[0083] The motor according to the present invention includes the rotor assembly of any of the above-described embodiments. Because the motor according to the present invention includes the rotor assembly of any of the above-described embodiments, the motor according to the present invention significantly reduces magnetic leakage, improves energy conversion efficiency, and ensures that the magnets cover key areas, thereby enhancing the motor's output capacity and operational stability.

[0084] The following briefly describes the compressor according to the present invention.

[0085] The compressor according to the present invention includes the motor of any one of the above-mentioned embodiments. Since the compressor according to the present invention includes the motor of any one of the above-mentioned embodiments, the compressor according to the present invention achieves a lower magnetic leakage rate and a higher energy conversion efficiency, thereby improving the output power and operating stability of the compressor.

[0086] The following briefly describes the refrigeration equipment according to the present utility model.

[0087] The refrigeration device according to the present invention includes the compressor of any one of the above-mentioned embodiments. Since the refrigeration device according to the present invention includes the compressor of any one of the above-mentioned embodiments, the refrigeration device according to the present invention significantly improves the refrigeration efficiency by integrating a compressor with low magnetic leakage rate and high energy conversion efficiency, while enhancing the stability and reliability of the device operation.

[0088] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0089] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A rotor assembly, characterized in that: include: a rotor body, the rotor body being provided with a plurality of poles spaced apart in a circumferential direction, with an air slot being formed between at least two adjacent poles; Each pole of the rotor body is formed with a magnetic steel slot, and the magnetic steel slot includes a first slot extending perpendicular to the radial direction and a second slot located at both ends of the first slot and extending radially away from the center of the circle; magnets, the magnets are respectively accommodated in the first slot and the second slot; wherein The two adjacent poles on the rotor body are symmetrical about the Q axis, and one pole on the rotor body is symmetrical about the D axis. The angle between the D axis and the Q axis is A1, and the angle between the outer end of the second slot and the D axis is A2, and the following is satisfied: 0.75≤A2 / A1≤0.

85.

2. The rotor assembly according to claim 1, wherein: A first magnet is accommodated in the first slot, and an angle A3 is formed between an end portion of the first magnet and the D axis and satisfies the following conditions: 0.25≤A3 / A2≤1.

3. The rotor assembly according to claim 1, wherein: The distance between the first slot and the center of the rotor body is D1, the outer diameter of the rotor body is R1, and the following relationship is satisfied: 0.453≤D1 / R1≤0.

824.

4. The rotor assembly according to claim 1, wherein: The distance between the intersection of the outer edge of the rotor body and the Q axis and the D axis is L1, and the distance between the end of the second slot and the D axis is L2, and the following relationship is satisfied: 0.75≤L2 / L1≤0.

85.

5. The rotor assembly according to claim 1, wherein: A distance between the end of the first groove and the D-axis is L3 and satisfies: 0.25≤L3 / L2≤1.

6. The rotor assembly according to claim 1, wherein: A communication port communicating with the air groove is formed on the outer edge of the rotor body.

7. The rotor assembly according to claim 6, wherein: The outer end of the communication port extends to the outer edge of the rotor body and has a width of D2, the inner end of the communication port is connected to the air slot and has a width of D3, and satisfies: D2≤D3, 0≤d3≤R1*[acrsin(L1 / R1)-acrsin(L2 / R1)].

8. The rotor assembly according to claim 6, wherein: The outer end of the communication port extends to the outer edge of the rotor body and has a width of D2. The inner end of the communication port communicates with the air slot and has a width of D3, and satisfies: D3≤D2, 0≤d2≤R1*[acrsin(L1 / R1)-acrsin(L2 / R1)].

9. A motor, characterized in that: A rotor assembly comprising any one of claims 1 to 8.

10. A compressor, characterized in that: Including the motor according to claim 9.

11. A refrigeration device, characterized in that: Including the compressor according to claim 10.

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