Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment, and relates to the technical field of motors, the motor comprises a stator assembly and a rotor assembly, the stator assembly comprises a stator iron core, the stator iron core comprises a stator yoke part and a plurality of tooth parts, and a winding groove is formed between every two adjacent tooth parts; the rotor assembly comprises a rotor iron core and multiple groups of magnet structures embedded in the rotor iron core, the multiple groups of magnet structures are arranged in the circumferential direction of the rotor iron core, and each magnet structure comprises at least one magnet; the distance between every two adjacent winding grooves is W (mm), the total width of the magnetic flux surface of the magnet of each group of magnet structure is K (mm), the thickness is L (mm), the residual magnetic flux density of the magnet at the temperature of 20 DEG C is B (T), the highest rotating speed of the motor is N (rps), the no-load running counter electromotive force coefficient is E0 (V / krpm), and E0 / N is larger than or equal to 0.24 and smaller than or equal to 0.4, so that the demagnetization resistance of the motor can be greatly improved.

Description

Technical Field

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

[0002] Rotary compressors mainly consist of three parts: the compressor housing, the compressor pump body, and the motor. These compressors often employ a high back pressure design, which forces the motor to operate under high temperature and high pressure conditions. For variable frequency permanent magnet motors, operating under such extreme conditions requires strong demagnetization resistance; otherwise, the motor may demagnetize due to high temperatures, causing the compressor to malfunction.

[0003] Currently, there are several attempts in the industry to enhance the demagnetizing resistance of motors, but each faces its own challenges: one approach is to increase the coercivity of the magnets, i.e., improve their resistance to external magnetic field interference. However, this method usually requires the use of more heavy rare earth elements, significantly increasing costs. Another strategy is to thicken the magnet material, which can also improve demagnetizing resistance, but this also leads to increased material costs. Yet another approach is to optimize the stator and rotor design structure. Although this can alleviate demagnetizing problems to some extent, the adjustable space is very limited if the slot-pole fit remains unchanged. Therefore, how to significantly improve the demagnetizing resistance of motors without increasing costs has become an urgent problem to be solved. Utility Model Content

[0004] The main purpose of this invention is to propose a motor, compressor, and refrigeration equipment, aiming to solve the problem of significantly improving the motor's resistance to demagnetization without increasing additional costs.

[0005] To achieve the above objectives, the motor proposed in this utility model includes:

[0006] A stator assembly includes a stator core, the stator core including a stator yoke and a plurality of teeth disposed on the inner circumference of the stator yoke, wherein a winding groove is formed between each pair of adjacent teeth; and,

[0007] The rotor assembly is located radially inside the stator assembly. The rotor assembly includes a rotor core and multiple sets of magnet structures embedded in the rotor core. The multiple sets of magnet structures are arranged along the circumference of the rotor core, and each set of magnet structures includes at least one magnet.

[0008] The spacing between two adjacent winding slots is W (mm), the total width of the magnetic flux surface of each magnet in each group of magnet structures is K (mm), the thickness is L (mm), the residual magnetic flux density of the magnet at 20℃ is B (T), the maximum speed of the motor is N (rpm), and the no-load back EMF coefficient is E0 (V / krpm). And 0.24≤E0 / N≤0.4.

[0009] In one implementation, 120rps < N ≤ 165rps.

[0010] In one embodiment, 1.3mm ≤ L ≤ 3mm.

[0011] In one embodiment, the rotor core is provided with a plurality of magnet slots, which are respectively used for the installation of the plurality of magnet structures;

[0012] Each of the magnetic steel slots is arranged in a straight line, a V-shape, or a U-shape.

[0013] In one embodiment, the magnet groove is arranged in a V-shape or a U-shape;

[0014] Each set of the magnet structures includes a pair of first magnets, each pair of first magnets being disposed apart from each other in a direction away from the center of the rotor core, and the included angle formed by each pair of first magnets being θ, where 100°≤θ≤150°.

[0015] In one embodiment, the rotor assembly has P poles, where P is set to 6 or 8.

[0016] In one embodiment, the intrinsic coercivity of the magnet at 20°C is Hcj (KA / m), where 1700KA / m ≤ Hcj ≤ 2200KA / m.

[0017] This utility model also provides a compressor, the compressor including a motor, the motor including:

[0018] A stator assembly includes a stator core, the stator core including a stator yoke and a plurality of teeth disposed on the inner circumference of the stator yoke, wherein a winding groove is formed between each pair of adjacent teeth; and,

[0019] The rotor assembly is located radially inside the stator assembly. The rotor assembly includes a rotor core and multiple sets of magnet structures embedded in the rotor core. The multiple sets of magnet structures are arranged along the circumference of the rotor core, and each set of magnet structures includes at least one magnet.

[0020] The spacing between two adjacent winding slots is W (mm), the total width of the magnetic flux surface of each magnet in each group of magnet structures is K (mm), the thickness is L (mm), the residual magnetic flux density of the magnet at 20℃ is B (T), the maximum speed of the motor is N (rpm), and the no-load back EMF coefficient is E0 (V / krpm). And 0.24≤E0 / N≤0.4.

[0021] This utility model also proposes a refrigeration device, which includes a compressor, the compressor including a motor, and the motor including:

[0022] A stator assembly includes a stator core, the stator core including a stator yoke and a plurality of teeth disposed on the inner circumference of the stator yoke, wherein a winding groove is formed between each pair of adjacent teeth; and,

[0023] The rotor assembly is located radially inside the stator assembly. The rotor assembly includes a rotor core and multiple sets of magnet structures embedded in the rotor core. The multiple sets of magnet structures are arranged along the circumference of the rotor core, and each set of magnet structures includes at least one magnet.

[0024] The spacing between two adjacent winding slots is W (mm), the total width of the magnetic flux surface of each magnet in each group of magnet structures is K (mm), the thickness is L (mm), the residual magnetic flux density of the magnet at 20℃ is B (T), the maximum speed of the motor is N (rpm), and the no-load back EMF coefficient is E0 (V / krpm). And 0.24≤E0 / N≤0.4.

[0025] In one embodiment, the refrigeration equipment includes an air conditioner.

[0026] In the technical solution of this utility model, without changing the thickness and coercivity of the magnet, the total width and thickness of the magnetic flux surface of the magnet, as well as the residual magnetic flux density B at 20°C, are set to satisfy the formula The value is between 4.2 and 5.5 to ensure that the magnetic flux generated by the magnet is neither excessive, avoiding magnetic leakage, nor insufficient, so that armature current compensation is not required and the magnetic circuit is kept in the optimal linear region. Furthermore, when the maximum speed N of the motor and the no-load operating back EMF coefficient E0 are set to satisfy the formula E0 / N being between 0.24 and 0.4, the dq axis current components can be optimally distributed, the quadrature axis demagnetization component can be reduced, and the motor's anti-demagnetization problem can be significantly improved. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the structure of an embodiment of the compressor provided by this utility model;

[0029] Figure 2 A schematic diagram of the structure of an embodiment of the motor provided by this utility model;

[0030] Figure 3 A schematic diagram of another embodiment of the motor provided by this utility model;

[0031] Figure 4 A schematic diagram of another embodiment of the motor provided by this utility model;

[0032] Figure 5 A schematic diagram illustrating the relationship between the motor's anti-demagnetization capability and E0 / N provided by this utility model;

[0033] Figure 6 The motor anti-demagnetization capability provided by this utility model and Diagram illustrating the relationship between them.

[0034] Explanation of icon numbers:

[0035] 100. Motor; 1. Stator assembly; 11. Stator core; 111. Stator yoke; 112. Tooth; 2. Rotor assembly; 21. Rotor core; 21a. Magnet slot; 22. Magnet structure; 221. Magnet; 2211. First magnet;

[0036] 200. Compressor.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] Currently, there are several attempts in the industry to enhance the demagnetizing resistance of motors, but each faces its own challenges: one approach is to increase the coercivity of the magnets, i.e., improve their resistance to external magnetic field interference. However, this method usually requires the use of more heavy rare earth elements, significantly increasing costs. Another strategy is to thicken the magnet material, which can also improve demagnetizing resistance, but this also leads to increased material costs. Yet another approach is to optimize the stator and rotor design structure. Although this can alleviate demagnetizing problems to some extent, the adjustable space is very limited if the slot-pole fit remains unchanged. Therefore, how to significantly improve the demagnetizing resistance of motors without increasing costs has become an urgent problem to be solved.

[0042] This utility model proposes a motor 100, which aims to solve the problem of how to significantly improve the motor's resistance to demagnetization without increasing additional costs.

[0043] Please see Figures 1 to 4In one embodiment of the present invention, the motor 100 includes a stator assembly 1 and a rotor assembly 2. The stator assembly 1 includes a stator core 11, which includes a stator yoke 111 and a plurality of teeth 112 disposed on the inner circumferential side of the stator yoke 111, with a winding groove formed between each pair of adjacent teeth 112. The rotor assembly 2 is located radially inside the stator assembly 1 and includes a rotor core 21 and a plurality of magnetic cores embedded in the rotor core 21. The rotor core 21 has a body structure 22, in which multiple sets of magnet structures 22 are arranged circumferentially. Each set of magnet structures 22 includes at least one magnet 221. The spacing between two adjacent winding slots is W (mm), the total width of the magnetic flux surface of the magnet in each set of magnet structures is K (mm), the thickness is L (mm), the residual magnetic flux density of the magnet at 20°C is B (T), the maximum speed of the motor is N (rpm), and the no-load back EMF coefficient is E0 (V / krpm). And 0.24≤E0 / N≤0.4.

[0044] It should be noted that you should refer to [link / reference]. Figures 2 to 4 K represents the total width (in millimeters) of the magnetic flux surface of the magnet 221 for each magnetic pole. When the magnet structure 22 includes a single magnet 221, please refer to [reference needed]. Figure 2 K represents the magnetic flux plane width of one of the magnets 221; when the magnet structure 22 includes multiple magnets 221, please refer to... Figure 3 and Figure 4 The magnetic flux plane widths of the multiple magnets 221 are K1, K2, K3... The total magnetic flux plane width of the magnets 221 is K = K1 + K2 + K3...

[0045] B refers to the residual magnetic flux density (in Tesla T) of the magnet 221 at 20°C, which reflects the inherent ability of the magnet material, that is, the level of magnetic flux density that the magnet can maintain in the absence of an external magnetic field.

[0046] The remanent magnetic flux density B of magnet 221 refers to the magnetic flux density that magnet 221 can still maintain when there is no external magnetic field, that is, after the external magnetic field source is removed. In other words, when a permanent magnet material is fully magnetized, even if the external magnetic field source is removed, a certain magnetic flux density still exists inside the material, which is called remanent magnetic flux density. It reflects the memory effect or the ability of permanent magnet materials to retain magnetism.

[0047] The spacing W between two adjacent winding slots, that is, the width of the tooth 112 (in millimeters), affects the magnetic flux path and magnetic reluctance, and thus affects the overall efficiency and performance of the motor 100.

[0048] It should also be noted that the main causes of demagnetization involve the following three aspects: high temperature demagnetization, armature reaction demagnetization, and high frequency harmonic demagnetization. High temperature demagnetization can be improved by reducing the operating current, armature reaction demagnetization can be improved by optimizing the magnetic flux density distribution, and high frequency harmonic demagnetization can be improved by controlling the potential waveform distortion rate.

[0049] The square root of the cross-section characterizes the magnetic permeability of magnet 221, reflecting the magnetic flux diffusion effect along the thickness direction of magnet 221. The B / W ratio controls the magnetic flux density per unit tooth width to avoid local magnetic saturation.

[0050] when When the magnet 221 provides insufficient magnetic flux, the operating current needs to be increased, which leads to a greater temperature rise and thus exacerbates demagnetization.

[0051] when When the magnetic flux density of the teeth 112 of the stator is too high, the leakage flux increases and local demagnetization field is easily generated.

[0052] Therefore, when At the same time, it avoids insufficient magnetic flux supply leading to an increase in armature reaction current, which could trigger high-temperature demagnetization (the synergistic effect of Joule heating and demagnetization field), and also prevents local magnetic saturation of the stator teeth 112, which could create a reverse demagnetization field that impacts the magnet 221.

[0053] It should also be noted that E0 / N is the back electromotive force constant per revolution, which reflects the induced voltage per unit speed and the rate of change of magnetic flux per unit speed.

[0054] The E0 / N constraint is primarily to balance electromagnetic and mechanical loads, preventing excessively high or low back EMF. When E0 / N is too low (less than 0.24), the magnetic load is insufficient, potentially requiring a larger armature current to maintain torque. This leads to increased current, copper losses, and temperature rise, ultimately causing high-temperature demagnetization. Simultaneously, increased armature current enhances armature reaction, increasing the risk of demagnetization. Conversely, if E0 / N is too high (greater than 0.4), the back EMF becomes excessively high at high speeds. The controller may need to increase the modulation depth, resulting in current waveform distortion and increased harmonic content, thus triggering high-frequency harmonic demagnetization.

[0055] When the inverter modulation ratio (m) exceeds 0.9 (the critical value for space vector modulation), the distortion rate of the output voltage waveform increases significantly, leading to a surge in high-frequency harmonic components (such as the 5th and 7th harmonics) in the current. These high-frequency harmonic currents generate an alternating demagnetizing field (especially the quadrature-axis component) in magnet 221, causing the operating point of magnet 221 to repeatedly cross the critical region of the demagnetization curve, accelerating irreversible demagnetization.

[0056] When the upper limit constraint of E0 / N is less than or equal to 0.4, the back EMF amplitude is directly limited during high-speed operation to prevent the controller from being forced into overmodulation state due to excessive back EMF.

[0057] As the armature current increases, the direct-axis armature reaction magnetic field (d-axis component) will superimpose with the permanent magnet magnetic field, causing local demagnetization of magnet 221.

[0058] When the lower limit constraint of E0 / N is greater than or equal to 0.24, it ensures that the magnetic load (magnetic flux density) is within a reasonable range, avoiding the need to increase the armature current to compensate for the torque due to insufficient magnetic flux.

[0059] By suppressing high-frequency harmonics (reducing copper losses) and reducing armature current (reducing Joule heating), the overall temperature rise (ΔT) of motor 100 can be effectively reduced.

[0060] Therefore, mainly targeting the dynamic demagnetization problem of high-frequency harmonic demagnetization, the ratio of the no-load operating back EMF coefficient E0 to the maximum speed N of the motor 100 is set between 0.24 and 0.4 to balance the electromagnetic load and the controller performance.

[0061] In the technical solution of this utility model, without changing the thickness and coercivity of the magnet 221, the total width and thickness of the magnetic flux surface of the magnet 221, as well as the residual magnetic flux density B at 20°C, are set to satisfy the formula The value is between 4.2 and 5.5, ensuring that the magnetic flux generated by magnet 221 is neither excessive, avoiding magnetic leakage, nor insufficient, eliminating the need for armature current compensation, and maintaining the magnetic circuit in the optimal linear region. Furthermore, when the maximum speed N of motor 100 and the no-load operating back EMF coefficient E0 are set to satisfy the formula E0 / N being between 0.24 and 0.4, the dq axis current components can be optimally distributed, reducing the quadrature axis demagnetization component and significantly improving the motor 100's resistance to demagnetization.

[0062] according to Figure 5 and Figure 6 As shown, Figure 5 This is a schematic diagram showing the relationship between the demagnetization resistance of the motor 100 provided by this utility model and E0 / N; it can be seen that when the E0 / N value is between 0.24 and 0.4, the energy efficiency COP of the compressor 200 can be at a high level, while the demagnetization rate of the motor is at a low level.

[0063] Figure 6 The motor 100 provided by this utility model has anti-demagnetization capability and A diagram illustrating the relationship between them is shown in... When the value is between 4.2 and 5.5, the energy efficiency of the compressor 200 is at a high level, while the demagnetization rate of the motor 100 is at a low level.

[0064] Furthermore, in this embodiment, 120rps < N ≤ 165rps.

[0065] It should be noted that when the motor 100 is running at a high speed, if the speed exceeds 120 rpm, if the same power output is required, since power is the product of torque and angular velocity (P=τω, where P is power, τ is torque, and ω is angular velocity), as the speed increases, the torque must be reduced in order to maintain constant power.

[0066] A lower back electromotive force (E0 / N) means a smaller back electromotive force generated at a given speed. A lower back electromotive force indicates a smaller voltage drop inside the motor 100, thereby improving the efficiency of the motor 100 at high speeds and reducing heat generation. Furthermore, a lower back electromotive force also indicates a relatively lower magnetic field strength inside the motor 100, reducing the reverse magnetic field effect on the magnet 221 and lowering the risk of demagnetization. The motor 100 can maintain high electromagnetic conversion efficiency without significantly increasing the amount of magnet 221 used, further enhancing the overall stability and reliability of the motor 100.

[0067] By limiting N to 120 to 165 rps, the harmonic THD can be reduced, the high-frequency demagnetization rate can be reduced, and dynamic demagnetization suppression can be achieved; the temperature rise ΔT can be reduced, the coercivity Hcj retention rate can be improved, and thermal demagnetization protection can be achieved; the centrifugal stress σ can be reduced, and the integrity of the magnet structure 22 can be improved, achieving mechanical reliability. By limiting the range of rotational speed N to the above range, the optimal balance point can be found between the electromagnetic performance, thermal management, and mechanical strength of the motor 100, achieving multi-dimensional demagnetization protection.

[0068] Furthermore, in this embodiment, 1.3mm ≤ L ≤ 3mm.

[0069] If the magnet 221 is too thin, it is prone to breakage during production, requiring high processing precision, resulting in low yield and potentially increased costs. Simultaneously, insufficient penetration depth of the magnetizing magnetic field can lead to uneven magnetization between the surface and interior of the magnet 221, and the magnetic flux of a thin magnet 221 may be insufficient, affecting its demagnetization resistance. On the other hand, while a magnet 221 that is too thick provides a large magnetic flux, it increases material costs and may also lead to a larger rotor size, affecting the motor's power density.

[0070] Limiting L to the range of 1.3mm to 3mm improves production feasibility, demagnetization resistance, cost-effectiveness, heat dissipation performance, and mechanical reliability.

[0071] Specifically, please refer to Figures 2 to 4In this embodiment, the rotor core 21 is provided with a plurality of magnet slots 21a, which are respectively installed on the plurality of magnet structures 22; each magnet slot 21a is arranged in a straight line, a V-shape or a U-shape.

[0072] The straight magnetic groove 21a is the simplest shape, and the magnets 221 are arranged directly along a straight line, which is relatively simple and has a low manufacturing cost.

[0073] The V-shaped magnet slot 21a arranges multiple magnets 221 at a certain angle, forming a layout similar to the letter "V". By adjusting the angle of the magnets to optimize the magnetic field distribution, it helps to improve the efficiency and power density of the motor 100.

[0074] The U-shaped magnet groove 21a provides a more enclosed space for the magnet 221. The magnet is embedded in a U-shaped groove to enhance the magnetic field strength and reduce magnetic leakage.

[0075] Different shapes of the magnetic slots 21a affect the distribution and intensity of the magnetic field. For example, V-shaped and U-shaped designs can better concentrate the magnetic field and reduce magnetic leakage, thereby improving the overall efficiency and performance of the motor 100. The straight magnetic slot 21a is relatively easy to manufacture and has a lower cost due to its simple structure; while V-shaped and U-shaped designs, although more complex, can bring performance improvements.

[0076] Specifically, in some embodiments, the magnetic groove 21a is arranged in a V-shape or a U-shape; each group of magnetic structures 22 includes a pair of first magnets 2211, each pair of first magnets 2211 is arranged away from each other in a direction away from the middle of the rotor core 21, and the included angle formed by each pair of first magnets 2211 is θ, 100°≤θ≤150°.

[0077] It should be noted that when the motor 100 is running, especially under high temperature and high pressure conditions, a reverse demagnetizing field (i.e., a reverse magnetic field) will be generated inside the motor 100, which poses a potential risk of demagnetization to the permanent magnet 221. By setting each pair of the first magnets 2211 to a certain included angle θ, the direction of the magnetic field generated by the magnets 221 can be made to form a certain angle with the possible reverse demagnetizing field, thereby reducing the direct impact of the reverse demagnetizing field on the magnets 221.

[0078] The included angle θ formed by the first magnet 2211 is set in the range of 100° to 150°. The larger the included angle θ between the magnets 221, the more dispersed the magnetic field paths formed between the magnets 221, which reduces the influence of the reverse magnetic field on a single magnet 221, thereby improving the overall anti-demagnetization capability of the magnets 221.

[0079] If the included angle θ formed by the first magnet 2211 is too small (less than 100°), the distance between the magnets 221 is too close, the magnetic field distribution is too concentrated, which can easily cause the local magnetic field strength to be too high and increase the risk of demagnetization.

[0080] If the included angle θ formed by the first magnet 2211 is too large (greater than 150°), although it can further disperse the magnetic field, it will reduce the effective utilization area of ​​the magnet 221, reduce the magnetic field strength, and affect the overall performance of the motor 100.

[0081] By setting the included angle θ formed by the first magnet 2211 within the range of 100° to 150°, the optimal included angle can be found through experiments and simulations. This angle can effectively disperse the magnetic field while ensuring sufficient magnetic field strength, thus achieving the best anti-demagnetization effect.

[0082] Specifically, in this embodiment, the rotor assembly 2 has P magnetic poles, where P is set to 6 or 8.

[0083] Understandably, the number of magnetic poles P refers to the number of magnetic poles on the rotor of the motor 100. Each pair of magnetic poles consists of a north pole (N) and a south pole (S), so a "pair" of magnetic poles contains two separate magnetic poles—an N pole and an S pole.

[0084] When P is set to 6, the motor 100 has 6 magnetic poles (3 N poles and 3 S poles). When P is set to 8, the motor 100 has 8 magnetic poles (4 N poles and 4 S poles). By appropriately selecting the number of magnetic poles, the performance of the motor 100 can be optimized while meeting specific application requirements, ensuring its efficient and stable operation.

[0085] Specifically, in this embodiment, the intrinsic coercivity of the magnet 221 at 20°C is Hcj (KA / m), where 1700KA / m ≤ Hcj ≤ 2200KA / m.

[0086] Intrinsic coercivity Hcj is one of the important indicators for measuring the demagnetization resistance of permanent magnet 221. It represents the magnetic field strength required to completely demagnetize magnet 221 under the action of a reverse magnetic field. The higher the Hcj, the more difficult it is for magnet 221 to be demagnetized by an external magnetic field, especially under high temperature or strong reverse magnetic field conditions, it has a higher demagnetization resistance.

[0087] By controlling the intrinsic coercivity of the magnet 221 between 1700 kA / m and 2200 kA / m, the demagnetization resistance of the motor 100 can be effectively improved, especially in high-temperature and high-pressure working environments. This not only optimizes the efficiency and power density of the motor 100 but also enhances its long-term stability and reliability, and reduces maintenance costs.

[0088] This utility model also proposes a compressor 200, which includes a cylinder and a motor 100. The specific structure of the motor 100 is as described in the above embodiments. Since this compressor 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0089] This utility model also proposes a refrigeration device, which includes a heat exchanger and a compressor 200. The specific structure of the compressor 200 is as described in the above embodiments. Since this refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0090] The refrigeration equipment may be a refrigerator, an air conditioner, or a water dispenser, etc. In one specific embodiment, the refrigeration equipment includes an air conditioner.

[0091] By The value is between 4.2 and 5.5, and the value of E0 / N is between 0.24 and 0.4. Improving the electromagnetic conversion efficiency reduces energy loss, allowing the air conditioning system to consume less electricity under the same cooling or heating demand, thus improving the energy efficiency ratio (EER) of the air conditioning system.

[0092] By optimizing the design parameters of magnet 221, the demagnetization resistance of motor 100 under high temperature and high pressure environments is enhanced, ensuring long-term stable operation of motor 100 and reducing performance degradation caused by weakening magnetic field. Simultaneously, the service life of motor 100 is extended, maintenance and replacement costs are reduced, and the overall reliability of the system is improved.

[0093] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An electric motor, characterized in that, include: A stator assembly includes a stator core, the stator core including a stator yoke and a plurality of teeth disposed on the inner circumference of the stator yoke, wherein a winding groove is formed between each pair of adjacent teeth; and, The rotor assembly is located radially inside the stator assembly. The rotor assembly includes a rotor core and multiple sets of magnet structures embedded in the rotor core. The multiple sets of magnet structures are arranged along the circumference of the rotor core, and each set of magnet structures includes at least one magnet. The spacing between two adjacent winding slots is W (mm), the total width of the magnetic flux surface of each magnet in each group of magnet structures is K (mm), the thickness is L (mm), the residual magnetic flux density of the magnet at 20℃ is B (T), the maximum speed of the motor is N (rpm), and the no-load back EMF coefficient is E0 (V / krpm). And 0.24≤E0 / N≤0.

4.

2. The motor as described in claim 1, characterized in that, 120rps<N≤165rps.

3. The motor as described in claim 1, characterized in that, 1.3mm≤L≤3mm.

4. The motor as described in claim 1, characterized in that, The rotor core is provided with multiple magnetic slots, which are used for the installation of the multiple sets of magnet structures respectively. Each of the magnetic steel slots is arranged in a straight line, a V-shape, or a U-shape.

5. The motor as described in claim 4, characterized in that, The magnetic groove is arranged in a V-shape or a U-shape; Each set of the magnet structures includes a pair of first magnets, each pair of first magnets being disposed apart from each other in a direction away from the center of the rotor core, and the included angle formed by each pair of first magnets being θ, where 100°≤θ≤150°.

6. The motor as described in claim 1, characterized in that, The rotor assembly has P magnetic poles, which can be set to 6 or 8.

7. The motor as described in claim 1, characterized in that, The intrinsic coercivity of the magnet at 20℃ is Hcj (KA / m), where 1700KA / m≤Hcj≤2200KA / m.

8. A compressor, characterized in that, Includes the motor as described in any one of claims 1 to 7.

9. A refrigeration device, characterized in that, Includes the compressor as described in claim 8.

10. The refrigeration equipment as described in claim 9, characterized in that, The refrigeration equipment includes an air conditioner.

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