Compressors and refrigeration equipment

Abstract

This invention discloses a compressor and refrigeration equipment, relating to the field of compressor technology. The compressor includes a motor and a cylinder. The motor includes a stator core and windings, with the windings located on the stator core. The maximum outer diameter of the stator core is D1, and the axial length of the stator core along the compressor is L. The cylinder and stator core are distributed axially, with the axial height of the cylinder being H and the inner diameter being D2, satisfying: where U is the maximum voltage of the compressor in V, B is the gauge pressure of the compressor in MPa, and D1, L, D2, and H are in mm. The technical solution provided by this invention aims to match the magnetic load capacity of the stator core with the mechanical load of the compressor, avoiding material waste and ensuring the energy efficiency of the compressor.

Description

Technical Field

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

[0002] In related technologies, the energy efficiency of a compressor is affected by the motor and cylinder. When assembling a compressor, the motor is often selected based on experience or power requirements. However, this design approach has two drawbacks. First, the magnetic flux density of the stator core may not meet the demands of a high-power compressor. Second, blindly increasing the stator core size can lead to material waste. This results in a mismatch between the magnetic load of the motor's stator core and the load of the cylinder, affecting the compressor's energy efficiency. Summary of the Invention

[0003] The main objective of this invention is to provide a compressor and refrigeration equipment that matches the magnetic load capacity of the stator core with the mechanical load of the compressor, thereby avoiding material waste and ensuring the energy efficiency of the compressor.

[0004] To achieve the above objectives, the compressor proposed in this invention includes:

[0005] An electric motor, comprising a stator core and windings, the windings being disposed on the stator core, the maximum outer diameter of the stator core being D1, and the axial length of the stator core along the compressor being L; and

[0006] A cylinder, wherein the cylinder and the stator core are distributed along the axial direction, the height of the cylinder in the axial direction is H, and the inner diameter of the cylinder is D2;

[0007] satisfy: Wherein, U is the maximum voltage of the compressor in V, B is the gauge pressure of the compressor in MPa, and D1, L, D2, and H are in mm.

[0008] In one embodiment, the motor is configured as a single-phase motor with N turns. The winding includes a main winding and an auxiliary winding. The wire diameter of the main winding is D3, and the wire diameter of the auxiliary winding is D4. The wire diameter of the main winding satisfies the following: The wire diameter of the secondary winding satisfies: Where D3 and D4 are in mm.

[0009] In one embodiment, the motor is configured as a three-phase motor, the number of turns of the motor is N, and the wire diameter of the winding is D5, satisfying: The unit of D5 is mm.

[0010] In one embodiment, the wire diameter of the winding is between 0.8 mm and 2.0 mm, the conductor of the winding is enameled wire, and the enamel thickness of the enameled wire is between 0.08 mm and 0.12 mm.

[0011] In one embodiment, the compressor further includes an overload protector, the locked-rotor current of the compressor is I1, and the operating current of the overload protector is I2, satisfying: The units for I1 and I2 are A.

[0012] In one embodiment, the distance between the overload protector and the winding is no more than 10 mm.

[0013] In one embodiment, the stator core has a plurality of stator teeth evenly distributed on its inner circumference, and a stator slot is formed between two adjacent stator teeth. The number of stator slots in the stator core is 12n, where n is a positive integer, and the slot area and shape of the plurality of stator slots are uniform.

[0014] In one embodiment, the circumferential width of the stator slot opening is W, satisfying: .

[0015] In one embodiment, the radial depth of the stator slot is T1, and the radial width of the stator core is T2, satisfying: The units for T1 and T2 are mm.

[0016] In one embodiment, the maximum outer diameter D1 of the stator core further satisfies: The stator core, along the axial length L of the compressor, also satisfies: .

[0017] In one embodiment, the axial height H of the cylinder and the inner diameter D2 of the cylinder further satisfy: .

[0018] In one embodiment, the conductors of the winding are made of at least aluminum.

[0019] In one embodiment, the motor further includes a rotor rotatably mounted on the inner circumference of the stator core, wherein the cross-sectional area of ​​the rotor bars is S1, and the cross-sectional area of ​​the winding conductors is S2, satisfying: Where S1 and S2 are in mm 2 .

[0020] The present invention also proposes a refrigeration device, which includes a compressor as described above.

[0021] The technical solution of this invention is limited This ensures that the stator core has sufficient magnetic circuit cross-sectional area and magnetic flux carrying capacity, and is compatible with the compressor's maximum mechanical load capacity, so that the compressor's motor power and pump body rigidity are matched, resulting in good energy efficiency. If D1 2 If ×L is too small, the stator core is prone to magnetic saturation, which leads to a sharp increase in excitation current, increased copper and iron losses, lower motor efficiency, excessive temperature rise, and in severe cases, may cause the windings to burn out. This ensures that the stator core can provide sufficient magnetic flux density under maximum load conditions, meeting the electromagnetic output requirements of high-power operation and ensuring stable and reliable operation of the compressor under high load conditions. This can be used to prevent excessive redundancy in the stator core size. If D1 or L is too large, although it can increase the magnetic load capacity, it will lead to an increase in motor size, material usage, and cost. It also increases unnecessary core weight and eddy current losses, reducing material utilization and overall energy efficiency. Therefore, by adjusting D1... 2 Setting the upper limit value of ×L effectively constrains the size of the stator core, achieving high material utilization while meeting performance requirements. Thus, by limiting the magnetic load capacity parameter D1, which reflects the stator core's magnetic load capacity... 2 The matching relationship between ×L and the cylinder height H, cylinder diameter D2, gauge pressure B, and maximum voltage U ensures that the magnetic load of the stator core matches the mechanical load of the compressor, guaranteeing power output and reducing the probability of material waste. This allows the motor's output capacity to match the compressor's load requirements, ensuring the compressor's energy efficiency. Attached Figure Description

[0022] 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.

[0023] Figure 1 A cross-sectional view of an embodiment of the compressor provided by the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the middle stator core;

[0025] Figure 3 for Figure 2 Cross-sectional view of section AA of the middle stator core;

[0026] Figure 4 for Figure 1 Schematic diagram of the middle cylinder;

[0027] Figure 5 for Figure 4 Cross-sectional view of the middle cylinder BB section;

[0028] Figure 6 for Figure 1 A cross-sectional view of the motor;

[0029] Figure 7 The compressor provided by this invention, at 3kW, has the following properties: pump body rigidity, motor efficiency, and D1. 2 ×L relationship diagram;

[0030] Figure 8 A graph showing the relationship between the motor efficiency, manufacturing cost, and winding wire diameter of the compressor provided by this invention;

[0031] Figure 9 The graph shows the relationship between stall temperature rise, stall durability, and stall current when the compressor operating current is 60A, as provided by this invention.

[0032] Explanation of icon numbers:

[0033] 100. Motor; 110. Stator core; 111. Stator slot; 112. Stator teeth; 120. Rotor; 130. Winding; 140. Overload protector; 200. Cylinder.

[0034] 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

[0035] 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.

[0036] 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 specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0037] 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. Thus, 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 invention.

[0038] This invention proposes a compressor.

[0039] Please refer to Figures 1 to 5 , Figure 7 In one embodiment of the present invention, the compressor includes:

[0040] Motor 100, comprising a stator core 110 and windings 130, the windings 130 being disposed on the stator core 110, the maximum outer diameter of the stator core 110 being D1, and the axial length of the stator core 110 along the compressor being L; and

[0041] Cylinder 200 and stator core 110 are distributed along the axial direction. The height of cylinder 200 in the axial direction is H, and the inner diameter of cylinder 200 is D2.

[0042] satisfy: Where U is the maximum voltage of the compressor in V, B is the gauge pressure of the compressor in MPa, and D1, L, D2, and H are in mm.

[0043] The technical solution of this invention is limited This ensures that the stator core 110 has sufficient magnetic circuit cross-sectional area and magnetic flux carrying capacity, and is compatible with the compressor's maximum mechanical load capacity, so that the compressor's motor power and pump body rigidity are matched, resulting in good energy efficiency. If D1 2 If ×L is too small, the stator core 110 is prone to magnetic saturation, which leads to a sharp increase in excitation current, increased copper and iron losses, decreased efficiency of motor 100, and excessive temperature rise. In severe cases, it may cause the winding 130 to burn out. Under maximum load conditions, the stator core 110 can provide sufficient magnetic flux density to meet the electromagnetic output requirements of high-power operation, ensuring stable and reliable operation of the compressor under high load conditions. This can be used to prevent excessive redundancy in the size of the stator core 110. If D1 or L is too large, although it can increase the magnetic load capacity, it will lead to an increase in the size of the motor 100, an increase in material usage, and an increase in cost. At the same time, it will increase unnecessary core weight and eddy current losses, and reduce material utilization and overall energy efficiency. Therefore, by adjusting D1... 2 Setting the upper limit value of ×L effectively constrains the size of the stator core 110, achieving a high material utilization rate while meeting performance requirements. Thus, by limiting the magnetic load capacity parameter D1, which reflects the stator core 110... 2 The matching relationship between ×L and the cylinder height H, cylinder diameter D2, gauge pressure B and maximum voltage U of cylinder 200 ensures that the magnetic load of stator core 110 matches the mechanical load of the compressor, guaranteeing power output and reducing the probability of material waste. This allows the output capacity of motor 100 to match the load requirements of the compressor, ensuring the energy efficiency of the compressor.

[0044] It should be noted that for compressors with different power requirements, the cylinder height H and cylinder diameter D2 corresponding to cylinder 200 are matched, and the maximum voltage U and gauge pressure B also show a linear relationship with the compressor power. D1 2 The larger and smaller values ​​of ×L are both limited by different coefficients of D2×H×B×U, reflecting D1 2 The range of ×L values ​​corresponds to the mechanical load of compressors with different power ratings, thus ensuring that the magnetic load capacity of the stator core 110 is compatible with the pump body stiffness of compressors of various power ratings. The coefficient range of 4.3 to 5.4 is derived from extensive experimental data and simulation analysis. Through multi-objective optimization of compressors with different displacements, maximum voltages, and pressures, considering factors such as electromagnetic performance, temperature rise, efficiency, and material costs, when D1... 2 When ×L is within the above range, the compressor achieves optimal matching between motor 100 power and compression load across all operating conditions, improving material utilization by over 15%, increasing overall energy efficiency by an average of 6%-12%, and keeping temperature rise within a safe range. Here, the maximum voltage U is the maximum safe voltage value that the compressor motor can operate safely at; the gauge pressure B is the compressor's rated pressure value, the actual measured pressure value during non-operational processes. For compressor motors with a rated power of 3kW to 10kW, the compressor gauge pressure U is between 4.0MPa and 5.0MPa; the maximum outer diameter D1 of the stator core 110 is understood as: the stator core 110 is fixed to the inner circumference of the compressor housing, and D1 is equal to the inner diameter of the compressor housing; the axial length L of the stator core 110 is understood as: the average length of the stator core 110 along the compressor's axial direction; and the cylinder 200 is a regular component, its inner diameter D2 and cylinder height H can be directly measured and can be understood as average values.

[0045] like Figure 7As shown, taking a compressor with a power of 3kW as a reference, according to the limitations of the above formula, it can be seen that 4.3×D2×H×B×U corresponds to D1. 2 The value of ×L is 1650cm 3 5.4×D2×H×B×U corresponds to D1 2 The value of ×L is 1900cm 3 Then, assuming the inner diameter of the compressor casing, i.e., assuming the value of D1, and then calculating the minimum value of L according to the constraints of the above formula, by adjusting the values ​​of D1 and L, the size of the stator core 110 is adapted to the high-power load, such as... Figure 7 D1 2 ×L takes the value of 1650cm 3 Up to 1900cm 3 Between these ranges, the compressor's pump body rigidity, corresponding to the compressor's mechanical load capacity, falls within the higher range of 1.6 MPa to 1.9 MPa. The efficiency of motor 100 is between 78% and 82%, showing a gradually increasing trend. Specifically, D1... 2 ×L is 1800cm 3 At that time, the pump body stiffness of the compressor was 1.9 MPa, and the efficiency of the compressor motor was 81%.

[0046] Regarding the compatibility between the wire diameter of winding 130 and the power of the compressor, in one embodiment, please refer to... Figure 1 , Figure 4 and Figure 5 , Figure 8 Motor 100 is configured as a single-phase motor 100, with N turns. Winding 130 includes a main winding and an auxiliary winding. The wire diameter of the main winding is D3, and the wire diameter of the auxiliary winding is D4. The wire diameter of the main winding satisfies the following: The wire diameter of the secondary winding satisfies: Where D3 and D4 are in mm. It can be understood that by limiting the matching relationship between the main and auxiliary winding wire diameters and the cylinder diameter D2, cylinder height H, operating voltage U, and number of turns N of cylinder 200, the electromagnetic performance of winding 130 and the compressor load requirements are synergistically optimized: the main winding meets... The secondary winding satisfies D3 2 / (4πN) and D4 2 / (4πN) represents the equivalent conductor cross-sectional area of ​​the main winding and the auxiliary winding per unit number of turns, which is the product of the cross-sectional area of ​​the 130mm wire diameter of the winding and the safe current carrying density. This ensures that the main winding has sufficient current carrying capacity to output rated torque under different voltage and load conditions, avoiding overheating or insufficient output. Simultaneously, it allows the auxiliary winding to provide appropriate phase difference current during the startup phase, guaranteeing reliable starting torque. Furthermore, taking the wire diameter limitation of the main winding as an example... and By characterizing the different mechanical load coefficients of the compressor, the upper and lower limits of the wire diameter of the main winding and auxiliary winding are clearly defined, corresponding to the current carrying density and the load coefficient of the compressor. This effectively balances copper loss, fill rate and winding cost, and prevents excessive resistance and severe heat generation caused by excessively thin wire diameter, or excessively thick wire diameter causing excessive slot fill rate and difficulty in winding. Thus, while ensuring the efficient and stable operation of the single-phase motor 100, the material utilization rate of the winding 130 and the overall energy efficiency level of the compressor are improved.

[0047] In another embodiment, for the three-phase motor 100, Figure 1 , Figure 4 and Figure 5 , Figure 8 The number of turns of motor 100 is N, and the wire diameter of winding 130 is D5, satisfying: The unit of D5 is mm. It can be understood that the motor winding 130 consists of three-phase symmetrical windings 130, with N turns per phase winding 130 and a wire diameter of D5, satisfying the following relationship: D5 2 / (4πN) represents the equivalent cross-sectional area of ​​the conductor of winding 130 per unit number of turns, which is the product of the cross-sectional area of ​​the winding 130 wire diameter and the safe current carrying density. By coupling and optimizing the wire diameter with the cylinder diameter D2 and cylinder height H of cylinder 200, the operating voltage U and the number of turns N, the current density of winding 130 is matched with the load requirements of the compressor under the maximum voltage U and rated pressure B. The lower limit of the compressor load factor ensures that the conductor of winding 130 has sufficient cross-sectional area to carry the operating current under high load conditions, preventing excessive resistance, increased copper loss and excessive temperature rise due to the wire diameter being too small, thus ensuring the reliability of continuous operation of motor 100. The upper limit of the compressor load factor avoids excessive slot fill factor, difficulty in embedding winding 130 and material waste caused by excessive wire diameter, while reducing unnecessary motor 100 volume. Thus, while ensuring the efficient and stable output of three-phase motor 100, the material utilization rate of winding 130 and the overall performance of compressor are improved.

[0048] Taking the main winding of a three-phase motor 100 as an example, according to the formula... Given the constraints, the compressor's cylinder diameter D2 is 60mm, cylinder height H is 28mm, and voltage U is 253V. Substituting these values ​​into the formula, we can find the minimum value of D3. For example... Figure 8 As shown, when D3 is 1mm, the efficiency of the compressor motor is 77%; when D3 is 1.1mm, the efficiency is 81%; and when D3 is 1.2mm, the efficiency is 82%. Furthermore, due to differences in compressor specifications, the specific manufacturing costs also vary. Figure 8The vertical axis does not indicate specific manufacturing costs, but for compressors of the same specifications, the manufacturing cost of the aforementioned compressor increases linearly with the increase of the wire diameter of winding 130. This shows that by balancing the wire diameter of winding 130 with the efficiency of the compressor's motor 100 and the compressor's high load requirements, and by also considering the relationship between wire diameter and manufacturing cost, the appropriate wire diameter of winding 130 for the power requirements can be determined, thus reducing the compressor's manufacturing cost. Here, D3, D4, and D5 represent any measured value of winding 130 for their respective scenarios.

[0049] In one embodiment, please refer to Figure 1 and Figure 6 The wire diameter of winding 130 ranges from 0.8mm to 2.0mm, and the conductor of winding 130 is enameled wire with a enamel coating thickness between 0.08mm and 0.12mm. Understandably, while ensuring the electrical insulation reliability of motor 100, the matching relationship between slot fill factor and conductor cross-sectional area was optimized: a lower limit of 0.8mm wire diameter avoids the problems of excessive resistance, severe heat generation, and insufficient mechanical strength caused by excessively thin wires, ensuring current carrying capacity and durability under high load conditions; an upper limit of 2.0mm wire diameter prevents winding difficulties, cost waste, and reduced space utilization of stator slot 111 caused by excessively thick wire diameter; at the same time, the enamel thickness is controlled in the range of 0.08 to 0.12mm, which not only meets the withstand voltage requirements of inter-turn insulation and prevents short-circuit breakdown, but also minimizes the space occupation of non-conductive parts, improves the filling efficiency and heat dissipation performance of winding 130, such as a temperature resistance class of F (greater than or equal to 155℃), thereby effectively improving material utilization, electromagnetic performance, and overall machine reliability while ensuring the insulation safety and process feasibility of motor 100.

[0050] Regarding the compressor overload protection, in this embodiment, please refer to... Figure 1 , Figure 6 and Figure 9 The compressor also includes an overload protector 140. The locked-rotor current of the compressor is I1, and the operating current of the overload protector 140 is I2, satisfying the following: Where I1 and I2 are in amperes (A). It can be understood that the overload protector 140 is used to promptly cut off the circuit when the motor 100 experiences abnormal current or temperature rise, preventing the winding 130 from burning out or the equipment from being damaged. The compressor's stall current is I1, which is the maximum current generated when the rotor 120 of the motor 100 is completely stalled under rated voltage, reflecting the electrical stress level of the compressor under extreme fault conditions. The operating current of the overload protector 140 is I2, which is the critical current value at which the overload protector 140 triggers tripping and disconnects the circuit under continuous energization, and is its rated value. This embodiment limits the two to satisfying the following relationship: This achieves precise matching between the protection device and the electrical characteristics of the compressor body, effectively solving the technical problem in traditional designs where the overload protector 140 is too sensitive, leading to malfunctions or delayed response causing protection failure. Specifically, when At the same time, ensure that after a stall fault occurs, the fault current is sufficient to overcome the operating threshold of the overload protector 140, reliably triggering the protection action within a reasonable time, avoiding the risk of insulation deterioration or fire caused by the motor 100 being subjected to short-circuit current for a long time due to insufficient I1 to drive the overload protector 140 to respond; simultaneously, by setting This limits the upper limit of the stall current, preventing excessively large I1 from causing the overload protector 140 to operate but already subjected to excessive thermal shock and electrodynamic stress, shortening its service life, or even causing contact welding or structural damage before operation, thereby ensuring the durability of the overload protector 140.

[0051] Among them, such as Figure 9 As shown, taking an overload protector 140 with an operating current I2 of 60A as an example, the corresponding I1 is between 78A and 90A, with a corresponding temperature rise of less than 134℃ and a locked-rotor durability of motor 100 of up to 520 hours. If I1 is 80A, the locked-rotor temperature rise is 127℃, and the locked-rotor durability is 498 hours, meeting the qualified standard of less than or equal to 140℃, and the locked-rotor durability of motor 100 is greater than or equal to 461 hours. Thus, the overload protector 140 responds reliably within 5 seconds, the locked-rotor temperature rise is reduced by 20%~30%, the risk of winding 130 burnout is reduced, the accuracy of the overload protector 140's operation is nearly 100%, and the average fault-free operating time of the compressor is increased to more than 50,000 hours.

[0052] Furthermore, in this embodiment, please refer to Figure 1 and Figure 6The distance between the overload protector 140 and the winding 130 should not exceed 10mm. This is understandable because the overload protector 140 typically provides protection by sensing the temperature or current thermal effect of the winding 130. If the distance between it and the winding 130 is too great, there will be a significant delay in heat conduction, causing the protector to sense the temperature lag behind the actual temperature rise of the winding 130. This may result in the protector failing to activate in time even when the motor 100 has overheated or a short circuit has occurred, posing a safety hazard. Maintaining the distance within 10mm ensures that the overload protector 140 is fully within the thermal field of the winding 130, achieving rapid thermal coupling. This allows it to more accurately and in real-time reflect the heating state of the winding 130, responding quickly and cutting off the circuit in case of overload, stalled rotor, or poor heat dissipation. This effectively prevents insulation aging, wire burnout, and even fire accidents, thereby improving the overload protector 140's sensitivity and accuracy in detecting temperature changes in the motor 100 winding 130. At the same time, it also reduces the thermal resistance in the signal transmission path, improves the reliability and repeatability of protection actions, and can maintain stable protection characteristics, especially under frequent start-stop or variable operating conditions, thereby significantly improving the overall safety performance and long-term operational stability of the compressor.

[0053] Regarding the structure of the stator slot 111 of the stator tooth 112, in one embodiment, please refer to... Figure 2The stator core 110 has multiple stator teeth 112 evenly distributed on its inner circumference. A stator slot 111 is formed between two adjacent stator teeth 112. The number of stator slots 111 in the stator core 110 is 12n, where n is a positive integer. The slot area and shape of the multiple stator slots 111 are uniform. This embodiment uses aluminum wire for winding 130. It is understood that aluminum wire, compared to copper wire, has higher resistivity, lower mechanical strength, poorer ductility, and requires more stringent connection processes. Therefore, it is more prone to breakage, damage, or poor contact during winding and embedding. Consequently, the consistency of the slot shape and the symmetry of the winding 130 distribution are more critical. By employing a 12n slot configuration, good matching with common pole number motors 100 can be achieved, effectively suppressing cogging torque and electromagnetic vibration, improving operational stability, and ensuring highly symmetrical spatial distribution of the three-phase windings 130, resulting in balanced current load. This avoids the risk of increased heating and oxidation of the aluminum wire due to excessive local current density caused by slot shape deviations or uneven distribution. Furthermore, the uniform design of the area and shape of all stator slots 111 facilitates the implementation of automatic aluminum wire embedding, reducing embedding resistance and winding breakage rate, improving slot fill rate and production yield, and ensuring consistent heat dissipation conditions within each slot to prevent localized hot spots. This ensures high reliability and low loss operation of the aluminum wire winding motor 130, while fully leveraging its advantages of lightweight and low cost. For example, it reduces the cost of the aluminum wire motor 100 by 35% to 45%, improves production efficiency by 10% to 15% with the uniform slot design, and solves the technical problem that aluminum wire is prone to performance degradation and insufficient durability due to structural unevenness in the application of motor 100.

[0054] Furthermore, in this embodiment, please refer to Figure 2 The circumferential width of the slot opening of stator slot 111 is W, which satisfies: It is understandable that, compared to copper wire, aluminum wire is softer, more ductile, has lower tensile strength, and poorer conductivity of its surface oxide layer. If the slot width is too small (less than 2.3mm) during the winding 130 embedding process, it will significantly increase the frictional resistance and compressive stress of the aluminum wire passing through the slot. This can easily lead to wire scratches, paint film damage, or bending deformation, resulting in inter-turn short circuits or poor contact. It also hinders the precise operation of automated embedding equipment, reducing production efficiency and yield. Conversely, if the slot width is too wide (more than 3.5mm), it will weaken the mechanical strength of the stator tooth root 112, affecting the overall structural stability of the core and increasing cogging torque pulsation. This will increase vibration and noise during motor 100 operation and may also cause uneven air gap magnetic flux distribution, reducing electromagnetic efficiency. This embodiment increases the utilization rate of winding space by controlling W within the range of 2.3mm to 3.5mm. While ensuring smooth embedding of the aluminum wire and reducing the risk of damage, it maintains good magnetic circuit structure symmetry and air gap magnetic field uniformity. This not only improves the process reliability and insulation life of the winding 130 assembly but also increases the heat dissipation area of ​​the stator core 110. It is suitable for high power density and high reliability applications in aluminum wire motors 100 compressors, achieving a synergistic improvement in performance, durability, and manufacturing feasibility. Here, W represents any measured value.

[0055] Regarding the relationship between the teeth and yoke of the stator core 110, in one embodiment, please refer to... Figure 2 The stator slot 111 has a radial depth of T1, and the stator core 110 has a radial width of T2, satisfying the following: The units for T1 and T2 are mm. It can be understood that when T1 / T2 is less than 60%, the stator slot 111 depth is relatively shallow, limiting the filling space of the winding 130 conductors, leading to a reduced slot fill factor. This not only affects the output capacity of the motor 100 but also increases the resistance of the winding 130 due to insufficient cross-sectional area of ​​the copper or aluminum wire, increasing losses and temperature rise, thus affecting efficiency and reliability. Conversely, when T1 / T2 exceeds 75%, the excessive slot depth significantly weakens the magnetic circuit cross-sectional area at the root and yoke of the stator teeth 112, easily causing local magnetic saturation of the core, increasing iron losses and reducing magnetic flux carrying capacity. Simultaneously, it reduces the overall mechanical stiffness of the stator core 110, affecting the stability of the stator core 110 lamination structure, especially prone to noise and loosening under high-frequency vibration conditions of the compressor. Thus, by controlling T1 / T2 within the range of 60% to 75%, sufficient slot space is ensured to accommodate the required number of turns and wire diameter of the winding 130, improving the freedom of electromagnetic design and power density. Sufficient yoke cross-section is also maintained to ensure smooth magnetic flux flow, reducing magnetic reluctance and saturation risks. Simultaneously, good structural strength and heat dissipation paths are maintained, facilitating rapid heat conduction from the winding 130 through the slot walls to the core body, improving thermal stability. This ensures efficient and high-torque output of the motor 100 while enhancing the reliability and durability of the compressor during long-term operation. The radial width T2 of the stator core 110 is any measured value, and the radial slot depth T1 of the stator slot 111 is any measured value.

[0056] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 6 The maximum outer diameter D1 of the stator core 110 also satisfies: The stator core 110, along the axial length L of the compressor, also satisfies: It should be noted that when D1 is less than 130mm or L is less than 80mm, the stator core 110 is too small, and the magnetic circuit cross-sectional area and the space for the winding 130 are limited. This makes it difficult to meet the magnetic flux density and number of turns required for high power output, which can easily lead to magnetic saturation, insufficient output, and excessive temperature rise. In particular, the performance deteriorates significantly under high compression ratio and high system load conditions. On the other hand, if D1 exceeds 300mm or L exceeds 200mm, the core size is too large. This not only increases material costs and the weight of the motor 100, but also causes the overall volume of the compressor to expand, affecting its installation adaptability in limited equipment space. It may also introduce additional iron losses due to the excessively long magnetic circuit, reducing energy efficiency. At the same time, it places higher demands on manufacturing processes such as stamping, stacking, winding, and assembly, affecting production efficiency and consistency. Thus, by limiting D1 and L to the ranges of 130–300 mm and 80–200 mm respectively, the stator core 110 is ensured to have sufficient electromagnetic capacitance to support the compression load requirements of large displacement and high pressure, thereby improving the power density and operating efficiency of the motor 100 and reducing material waste. For example, for mass-produced compressors with a single-cylinder displacement greater than or equal to 30 cc / rev, the material waste rate is reduced to below 5%.

[0057] Regarding the dimensions of cylinder 200, in one embodiment, please refer to... Figure 1 , Figure 4 and Figure 5 The axial height H of cylinder 200 and the inner diameter D2 of cylinder 200 also satisfy: It should be noted that when the product of D2×H is too small, the cylinder volume of 200 is limited, resulting in insufficient single-stroke displacement. This makes it difficult to meet the gas compression requirements under high cooling capacity conditions, necessitating an increase in engine speed to compensate. This, in turn, leads to problems such as increased vibration, noise, and accelerated mechanical wear. However, by setting... This design ensures that cylinder 200 has sufficient compression chamber volume, enabling large-volume gas delivery without significantly increasing rotational speed. This improves volumetric efficiency and system energy efficiency, suitable for compressors with a displacement greater than or equal to 30cc / rev. Simultaneously, this size range balances the structural strength and thermal stability of cylinder 200. Larger D2 and H values ​​help disperse lateral forces and thermal loads during piston reciprocating motion, reducing localized stress concentration and the risk of thermal deformation, thus improving sliding seal performance and service life. In applications using high-gauge-pressure refrigerants (such as R32 and R410A), this design effectively reduces the load intensity per unit displacement. Combined with the adaptive optimization of the motor 100's magnetic circuit and winding 130, this ensures continuous and stable compressor operation under high-load conditions. Therefore, it effectively improves the compressor's displacement capacity and structural load-bearing capacity, addressing the critical requirements of high-power refrigeration systems for compressor output capacity and operational stability.

[0058] In one embodiment, please refer to Figure 1 and Figure 6 The conductor of winding 130 is made of at least aluminum. It is understood that the compressor motor 100 in this design is configured as an aluminum wire motor 100. Using high-purity oxygen-free aluminum (purity greater than or equal to 99.7%) reduces the material cost and overall weight of the compressor while ensuring the electrical performance and operational reliability of the motor 100. This solves the high cost and resource constraints associated with traditional copper wire windings 130. When aluminum wire is used as the conductor for winding 130, its density is only about 30% of that of copper. Although the cross-sectional area needs to be appropriately increased for the same length and resistance requirements, a significant reduction in overall weight can still be achieved, which is beneficial for the lightweight design of the compressor and the control of overall vibration. At the same time, aluminum resources are abundant and inexpensive; using aluminum wire can significantly reduce raw material procurement costs and enhance the product's market competitiveness. To address the technical challenges of low conductivity, demanding connection processes, susceptibility to oxidation, and relatively weak mechanical strength of aluminum wire, this solution systematically addresses these issues through synergistic optimization with other structural parameters. Firstly, by limiting the outer diameter D1 of the stator core 110 to 130–300 mm and the axial length L to 80–200 mm, while ensuring that D1… 2 The matching relationship between ×L and D2×H×B×U (4.3 to 5.4 times) ensures that the stator core 110 has sufficient magnetic load capacity to compensate for the insufficient magnetic field strength that may be caused by the aluminum wire, thus guaranteeing high power output capability; secondly, by setting the wire diameter of the main winding, auxiliary winding, or three-phase winding 130 to meet D 2 The proportional relationship between / (4πN) and D2×H / U allows for a reasonable increase in the cross-sectional area of ​​the aluminum wire to reduce current density, ensuring the wire diameter is suitable for high load requirements and controlling temperature rise within a safe range. Furthermore, the stator slot 111 opening width W is designed to be 2.3–3.5 mm, and the ratio of slot depth T1 to core radial width T2 is controlled at 60%–75%, effectively improving slot fill factor and reducing the risk of scratches and breakage during aluminum wire winding. Simultaneously, the number of stator slots 111 is set to 12n with uniform slot shape, enhancing the symmetry of winding 130 and adapting to the winding process, reducing the winding breakage rate to below 1%. In addition, the overload protector 140's operating current I2 and stall current I1 satisfy 1.3I2≤I1≤1.5I2, and the distance between the overload protector 140 and winding 130 is no greater than 10 mm, ensuring a more sensitive thermal response to the aluminum wire winding 130 and timely prevention of safety hazards caused by changes in contact resistance or localized overheating.

[0059] In summary, this solution, by comprehensively coordinating the application of aluminum wire with the electromagnetic design, structural dimensions, thermal management, and protection mechanisms of Motor 100, not only fully leverages the advantages of aluminum's lightweight and low cost but also overcomes its shortcomings in conductivity, processability, and reliability. It achieves a balance between high power, high reliability, and economy, making it suitable for large-scale applications in medium-to-large commercial and residential inverter compressors. Specifically, the compressor's gauge pressure U is between 4.0 MPa and 5.0 MPa, it is compatible with R32 refrigerant, and the corresponding rated power of Motor 100 is 3kW to 10kW, with a displacement greater than or equal to 30cc / rev (ml / rpm).

[0060] In one embodiment, please refer to Figure 1 The motor 100 also includes a rotor 120 rotatably mounted on the inner circumference of the stator core 110. The cross-sectional area of ​​the conductor bars of the rotor 120 is S1, and the cross-sectional area of ​​the wires of the winding 130 is S2, satisfying the following: Where S1 and S2 are in mm 2 It can be understood that the rotor 120 in this embodiment adopts a squirrel-cage structure, and the cross-sectional area S1 of its conductor bar and the cross-sectional area S2 of the stator winding 130 conductor satisfy the ratio S1 / S2 between 1.2 and 1.5. This achieves a precise match between the current carrying capacity and electromagnetic coupling characteristics of the conductive parts of the stator and rotor 120 of the motor 100, and is better suited for application scenarios where the winding 130 uses aluminum wire as the conductor material. It should be noted that, since the resistivity of aluminum wire is approximately 1.6 times that of copper, under the same power conditions, to reduce the resistance of winding 130 and control copper losses and temperature rise, the cross-sectional area S2 of the aluminum wire needs to be appropriately increased. The rotor 120 conductor bars are typically made of aluminum or copper through die-casting. If S1 / S2 is too small, meaning the cross-sectional area of ​​the rotor 120 conductor bars is relatively insufficient, the rotor 120 resistance will be too high. This will not only increase aluminum losses in the rotor 120 but may also cause a decrease in starting torque, an increase in slip, and a reduction in efficiency. This is more pronounced when the compressor frequently starts and stops or operates under high load. Conversely, if S1 / S2 is too large, the cross-sectional area of ​​the rotor 120 conductor bars will be excessively increased, weakening the filling space of the winding 130 within the stator slot 111, affecting the magnetic circuit distribution of the stator core 110, and potentially increasing the rotor 120 inertia, thus affecting dynamic response performance. Of course, in other embodiments, the motor 100 can also be configured as a permanent magnet motor.

[0061] This embodiment controls S1 / S2 within the range of 1.2 to 1.5, ensuring that the rotor 120 conductor bars have sufficient conductivity to match the magnetic field and current levels generated by the stator winding 130, achieving good electromagnetic energy transfer, improving the efficiency and output capacity of the motor 100, while avoiding material waste and structural space conflicts. Simultaneously, this ratio matches the aforementioned stator slot 111 shape, stator core 110 dimensions, winding 130 turns N, voltage U, pressure B, and other parameters, optimizing the load distribution and thermal balance characteristics of the motor 100. This ensures that under high voltage and high system pressure conditions, the current density distribution of the stator and rotor 120 is reasonable, the temperature rise is uniform, and the risk of insulation aging of the winding 130 or breakage of the rotor 120 conductor bars due to localized overheating is effectively prevented. Furthermore, when using aluminum wire winding 130, limitations are specified... It can also compensate for the electromagnetic asymmetry caused by the low conductivity of aluminum, improve the balance of three-phase current and the stability of operation, and enhance the compressor's adaptability and long-term operational reliability under variable frequency and variable load conditions.

[0062] This invention also proposes a refrigeration device, which includes a compressor. The specific structure of the 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 elaborated here. The refrigeration device can be configured as an air conditioner or a refrigerator, etc.

[0063] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A compressor, characterized in that, include: An electric motor, comprising a stator core and windings, the windings being disposed on the stator core, the maximum outer diameter of the stator core being D1, and the axial length of the stator core along the compressor being L; and A cylinder, wherein the cylinder and the stator core are distributed along the axial direction, the height of the cylinder in the axial direction is H, and the inner diameter of the cylinder is D2; satisfy: Wherein, U is the maximum voltage of the compressor in V, B is the gauge pressure of the compressor in MPa, and D1, L, D2, and H are in mm.

2. The compressor as described in claim 1, characterized in that, The wire diameter of the winding is between 0.8 mm and 2.0 mm, and the conductor of the winding is enameled wire with a enamel coating thickness between 0.08 mm and 0.12 mm.

3. The compressor as described in claim 1, characterized in that, The compressor also includes an overload protector. The locked-rotor current of the compressor is I1, and the operating current of the overload protector is I2, satisfying the following: The units for I1 and I2 are A.

4. The compressor as described in claim 3, characterized in that, The distance between the overload protector and the winding is no more than 10mm.

5. The compressor as described in claim 1, characterized in that, The stator core has a plurality of stator teeth evenly distributed on its inner circumference, and a stator slot is formed between two adjacent stator teeth. The number of stator slots in the stator core is 12n, where n is a positive integer, and the slot area and shape of the plurality of stator slots are uniform.

6. The compressor as described in claim 5, characterized in that, The circumferential width of the stator slot opening is W, satisfying: ; And / or, the radial depth of the stator slot is T1, and the radial width of the stator core is T2, satisfying: The units for T1 and T2 are mm.

7. The compressor as claimed in claim 1, characterized in that, The maximum outer diameter D1 of the stator core also satisfies: The stator core, along the axial length L of the compressor, also satisfies: ; And / or, the axial height H of the cylinder and the inner diameter D2 of the cylinder also satisfy: .

8. The compressor as claimed in claim 1, characterized in that, The conductors of the winding are made of at least aluminum. And / or, the motor further includes a rotor rotatably mounted on the inner circumference of the stator core, wherein the cross-sectional area of ​​the rotor bars is S1, and the cross-sectional area of ​​the winding conductors is S2, satisfying: Where S1 and S2 are in mm 2 .

9. A refrigeration device, characterized in that, Includes the compressor as described in any one of claims 1 to 8.

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