Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment, and relates to refrigeration equipment technical field, the motor comprises a motor stator and a motor rotor, the motor stator comprises a stator iron core, the stator iron core maximum outer circle contour radius is R1, and the stator iron core minimum inner circle contour radius is R2; the area of the cross section of a single stator slot on a plane perpendicular to the axis of the stator core is S1; the area of the cross section of the permanent magnet under a single magnetic pole on a plane perpendicular to the axis of the rotor core is S2; wherein 4 < (R2 / R1) * (S1 / S2) < 5.5. According to the technical scheme provided by the utility model, by adjusting the relationship among the maximum outer circle contour radius R1 of the stator core, the minimum inner circle contour radius R2 of the stator core, the area S1 of the stator single slot and the area S2 of the permanent magnet under the single magnetic pole, R2 / R1 and S1 / S2 meet the condition that (R2 / R1) * (S1 / S2) is more than 4 and less than 5.5, so that the copper loss and iron loss of the motor can be balanced, and the efficiency and overload capacity of the motor are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, and particularly relates to an electric motor, a compressor and a refrigeration equipment. Background Art

[0002] The compressor is the heart of the refrigeration equipment, and high efficiency has always been a key research topic in the compressor industry. As the power source of the compressor, the electric motor plays the most important role in the energy efficiency performance.

[0003] The losses of the electric motor mainly include copper loss, iron loss, mechanical loss and stray loss. The losses of the electric motor will not only cause the electric motor to heat up, reduce the efficiency of the electric motor, but also limit the overload capacity and service life of the electric motor. Therefore, it is very important to reduce the losses of the electric motor and improve the energy efficiency of the electric motor. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose an electric motor, a compressor and a refrigeration equipment, aiming to improve the efficiency and overload capacity of the electric motor.

[0005] To achieve the above purpose, the electric motor proposed by the utility model includes:

[0006] An electric motor stator, including a stator core, the maximum outer circle contour radius of the stator core is R 1 , the minimum inner circle contour radius of the stator core is R 2 ; the stator core includes a stator yoke and stator teeth, a plurality of the stator teeth are arranged at intervals along the inner circumference of the stator yoke, a stator slot is formed between two adjacent stator teeth, and the area of the cross-section of a single stator slot intercepted by a plane perpendicular to the axis of the stator core is S 1 ;

[0007] An electric motor rotor, which is arranged through the inner circumference of the electric motor stator, the electric motor rotor includes a rotor core and permanent magnets, a plurality of permanent magnet slots are arranged at intervals along the circumference of the rotor core, and the permanent magnets are embedded in the permanent magnet slots so that the rotor core forms a plurality of magnetic poles, and the area of the cross-section of the permanent magnet under a single magnetic pole intercepted by a plane perpendicular to the axis of the rotor core is S 2 ;

[0008] Wherein, 4 < (R 2 / R 1 ) × (S 1 / S 2 ) < 5.5.

[0009] In an embodiment, 0.6 ≤ R 1 / R 2 ≤ 0.65.

[0010] In an embodiment, 0.6 ≤ R 1 / R 2 ≤0.62

[0011] In one embodiment, 40 mm ≤ R 1 ≤ 95 mm

[0012] In one embodiment, 20 mm ≤ R 2 ≤ 40 mm

[0013] In one embodiment, 7.1 < S 1 / S 2 <10

[0014] In one embodiment, 100 mm 2 ≤ S 1 ≤ 400 mm 2 .

[0015] In one embodiment, 10 mm 2 ≤ S 2 ≤ 75 mm 2 .

[0016] In one embodiment, a plurality of the permanent magnets form 2P magnetic poles in the circumferential direction of the rotor core, and the number of stator slots is Q, and Q and 2P satisfy: 1 < Q / 2P < 3

[0017] In one embodiment, 15 ≤ Q ≤ 18

[0018] In one embodiment, 10 ≤ 2P ≤ 12

[0019] In one embodiment, Q / 2P = 3 / 2

[0020] In one embodiment, the permanent magnet slots are linear, arc-shaped, "V"-shaped, "U"-shaped or "W"-shaped in a plane perpendicular to the axis of the rotor core

[0021] In one embodiment, the permanent magnet slots include a plurality of slot segments, and each slot segment is embedded with one of the permanent magnets, and S 2 is the sum of the cross-sectional areas of the plurality of permanent magnets under a single magnetic pole intercepted by a plane perpendicular to the axis of the rotor core

[0022] The present utility model also provides a compressor, including the aforementioned motor

[0023] The present utility model also provides a refrigeration device, including the aforementioned compressor

[0024] The technical solution of the present utility model adjusts the maximum outer circle contour radius of the stator core to R 1 and the minimum inner circle contour radius of the stator core to R 2, the area S of a single stator slot 1 and the area S of the permanent magnet under a single magnetic pole 2 such that R 2 / R 1 and S 1 / S 2 satisfy: 4 < (R 2 / R 1 ) × (S 1 / S 2 ) < 5.5, which can balance the copper loss and iron loss of the motor and improve the efficiency and overload capacity of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0026] Figure 1 is a schematic structural diagram of an embodiment of the motor provided by the present invention;

[0027] Figure 2 is the relationship curve between (R 2 / R 1 ) × (S 1 / S 2 ) and the motor efficiency;

[0028] Figure 3 is the relationship curve between (R 2 / R 1 ) × (S 1 / S 2 ) and the motor overload capacity;

[0029] Figure 4 is the relationship curve between (S 1 / S 2 ) and the motor efficiency;

[0030] Figure 5 is the relationship curve between (S 1 / S 2 ) and the motor overload capacity.

[0031] Description of the reference numerals in the drawings:

[0032] 10. Motor; 100. Motor rotor; 200. Motor stator; 110. Rotor core; 111. Permanent magnet slot; 120. Permanent magnet; 210. Stator core; 211. Stator yoke; 212. Stator tooth; 213. Stator slot.

[0033] The realization, functional features and advantages of the present utility model will be further described in conjunction with embodiments and with reference to the accompanying drawings. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0035] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, then the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0037] The present utility model provides a motor 10.

[0038] Please refer to Figure 1 , in an embodiment of the present utility model, the motor 10 includes a motor stator 200 and a motor rotor 100. The motor stator 200 includes a stator core 210, and the maximum outer circular contour radius of the stator core 210 is R 1 , and the minimum inner circular contour radius of the stator core 210 is R 2; The stator core 210 includes a stator yoke 211 and stator teeth 212. A plurality of stator teeth 212 are arranged at intervals along the inner circumference of the stator yoke 211. A stator slot 213 is formed between two adjacent stator teeth 212. The area of the cross-section of a single stator slot 213 intercepted by a plane perpendicular to the axis of the stator core 210 is S 1 ; The motor rotor 100 is disposed through the inner circumference of the motor stator 200. The motor rotor 100 includes a rotor core 110 and permanent magnets 120. A plurality of permanent magnet slots 111 are provided at intervals along the circumference of the rotor core 110. The permanent magnets 120 are embedded in the permanent magnet slots 111 so that the rotor core 110 forms a plurality of magnetic poles. The area of the cross-section of the permanent magnets 120 under a single magnetic pole intercepted by a plane perpendicular to the axis of the rotor core 110 is S 2 ; Wherein, 4 < (R 2 / R 1 ) × (S 1 / S 2 ) < 5.5.

[0039] Specifically, the motor 10 includes a motor rotor 100 and a motor stator 200. The motor stator 200 is sleeved on the outer circumference of the motor rotor 100. The motor stator 200 includes a stator core 210 and a stator winding for generating a rotating magnetic field. The stator core 210 is formed by laminating silicon steel sheets. The stator core 210 includes a stator yoke 211 and stator teeth 212. The stator yoke 211 is annular. A plurality of stator teeth 212 are arranged at intervals along the circumferential direction of the stator yoke 211 on the inner side of the stator yoke 211. A stator slot 213 is defined between adjacent stator teeth 212. The number of stator slots 213 is the same as the number of stator teeth 212. The stator winding passes through the stator slots 213 and is directly wound around the stator teeth 212. When three-phase alternating current is applied to the stator winding, a rotating magnetic field is generated, and the permanent magnets 120 on the motor rotor 100 interact with the rotating magnetic field to generate a torque, thereby driving the motor 10 to rotate. The motor rotor 100 includes a rotor core 110 and permanent magnets 120. The permanent magnets 120 can generate a constant magnetic field and interact with the rotating magnetic field to generate a torque. The motor rotor 100 can rotate relative to the motor stator 200 to realize the normal operation of the motor 10. The rotor core 110 is made of a high-permeability material or laminated silicon steel sheets, has a high magnetic flux rate, and has high structural strength and is easy to process. The permanent magnets 120 are embedded in the permanent magnet slots 111. When embedded, it is required that the permanent magnets 120 under the same magnetic pole have the same polarity in the direction of the outer circumference of the motor rotor 100, and at the same time, it is required that the magnetic properties of the permanent magnets 120 of adjacent magnetic poles are opposite. A plurality of magnetic poles are alternately distributed in the circumferential direction of the rotor core 110 according to N poles and S poles.

[0040] The maximum outer circle contour radius of the stator core 210 is R 1, which is the maximum distance from the center of the stator core 210 to its outer edge contour. If the outer periphery of the stator core 210 is a complete circle, it can be directly measured, and the maximum value of the radius of the stator core 210 is measured as R 1 ; if the outer periphery of the stator core 210 is in the form of a non-complete circle with grooves, after determining the circle at three points at the outermost end of the arc, the maximum value of the radius of the stator core 210 is measured as R 1 .

[0041] The minimum inner circle contour radius of the stator core 210 is R 2 , which is the minimum distance from the center of the stator core 210 to its inner edge contour. If the inner periphery of the stator core 210 is a complete circle, it can be directly measured, and the minimum value of the radius of the stator core 210 is measured as R 2 ; if the inner periphery of the stator core 210 is in the form of a non-complete circle with grooves, after determining the circle at three points at the innermost end of the arc, the minimum value of the radius of the stator core 210 is measured as R 2 .

[0042] The area of the cross-section of a single stator slot 213 intercepted by a plane perpendicular to the axis of the stator core 210 is the area S of a single stator slot 1 , and the area of a single stator slot is formed by the arc formed by the inner wall of the stator slot 213 on the cross-section intercepted by a plane perpendicular to the axis of the stator core 210, and the straight line connecting the two end points of the slot opening

[0043] The area of the cross-section of the permanent magnet 120 under a single magnetic pole intercepted by a plane perpendicular to the axis of the rotor core 110 is the area S of the permanent magnet 120 under a single magnetic pole 2 . When a single permanent magnet 120 is arranged under a single magnetic pole, the area of the cross-section of the single permanent magnet 120 intercepted by a plane perpendicular to the axis of the rotor core 110 is S 2 ; when multiple permanent magnets 120 are arranged under a single magnetic pole, the sum of the areas of the cross-sections of the multiple permanent magnets 120 intercepted by a plane perpendicular to the axis of the rotor core 110 is S 2 .

[0044] R 2 / R 1 is the split ratio of the motor 10. In an extreme case, when R 2 / R 1 is 0, that is, R 2 is 0, and the motor rotor 100 is not set. At this time, the area S of a single stator slot 1 is the largest, and the area S of the permanent magnet 120 2 is 0. In another extreme case, when R 2 / R 1 is 1, that is, R 2 =R 1 , the area S of a single stator slot1 is 0, and the area S of the permanent magnet 120 2 is the largest. In these two extreme cases, the output torque of the motor 10 is also 0. Therefore, in the motor 10, parametric research is carried out and different R 2 / R 1 ratios corresponding to the area S of a single stator slot 1 and the area S of the permanent magnet 120 2 are studied to optimize the permanent magnet magnetic field and the armature magnetic field, thereby reducing the losses of the motor 10, improving the energy efficiency and overload capacity of the motor 10.

[0045] According to the experimental results, by adjusting the maximum outer circle contour radius of the stator core 210 to be R 1 , the minimum inner circle contour radius of the stator core 210 to be R 2 , the area S of a single stator slot 1 and the area S of the permanent magnet 120 under a single magnetic pole 2 , the relationship is such that R 2 / R 1 and S 1 / S 2 satisfy: 4 < (R 2 / R 1 ) × (S 1 / S 2 ) < 5.5, which can balance the copper loss and iron loss of the motor 10 and improve the efficiency and overload capacity of the motor 10.

[0046] When R 2 / R 1 has a relatively high ratio, it means that the motor stator 200 has a larger stator inner diameter, resulting in a smaller radial distance between the inner diameter and the outer diameter of the stator core 210, that is, the stator core 210 is thinner in its radial direction. The thinner stator core 210 has lower structural strength, and the thinner stator core 210 will cause larger eddy currents, thereby increasing the eddy current loss (eddy current is the induced current generated inside the conductor in a changing magnetic field, which will generate heat), thus reducing the efficiency and overload capacity of the motor 10.

[0047] When R 2 / R 1When the ratio is relatively high, it may also mean that the stator core 210 has a smaller outer stator diameter. The change in the inner diameter of the stator core 210 affects the magnetic flux density of the stator core 210. In the case of the same magnetic flux, a smaller outer stator diameter will cause the magnetic flux density of the stator core 210 to increase sharply. The iron loss of the stator core 210 is positively correlated with the magnetic flux density in an exponential coefficient, thus increasing the iron loss of the stator core 210 (mainly hysteresis loss and eddy current loss) and reducing the efficiency of the motor 10. In addition, the size of the inner diameter of the stator core 210 directly determines the size of the air gap between the stator and the rotor. A larger air gap will result in a higher magnetic resistance, thereby increasing the iron loss and copper loss, reducing the efficiency of the motor 10, and at the same time reducing the starting torque and maximum torque of the motor 10.

[0048] The area S of a single stator slot 1 determines the arrangement of the number of windings in the stator slot 213. Setting more stator windings in the stator slot 213 helps to increase the peak current and load-carrying capacity of the motor 10, thereby improving the efficiency and overload capacity of the motor 10. However, it will also lead to an increase in the winding resistance, thereby increasing the copper loss and also affecting the efficiency of the motor 10.

[0049] The area S of the permanent magnet 120 under a single magnetic pole 2 directly affects the magnitude and distribution of the magnetic flux. A larger area of the permanent magnet 120 means that more magnetic flux can pass through the stator core 210, which helps to increase the output power of the motor 10. However, if the magnetic flux is too large, it will cause magnetic circuit saturation and increase the iron loss (hysteresis loss and eddy current loss), thereby reducing the efficiency of the motor 10.

[0050] When the area S of a single stator slot 1 the copper loss within and the area S of the permanent magnet 120 under a single magnetic pole 2 the iron loss within reach a balance, the efficiency of the motor 10 is the highest. By exploring the relationship between R 2 / R 1 at different ratios, the relationship between R 2 / R 1 and S 1 / S 2 is such that the copper loss and iron loss of the motor 10 can reach a balance, thereby improving the efficiency and overload capacity of the motor 10.

[0051] Please refer to Table 1 and Figure 2 , as (R 2 / R 1 ) × (S 1 / S 2 ) increases, the efficiency of the motor 10 first gradually increases and then gradually decreases. When 4 < (R 2 / R 1 ) × (S 1 / S2 ) When it is less than 5.5, the efficiency of the motor 10 is higher than 93.4%. Among them, when (R 2 / R 1 )×(S 1 / S 2 ) = 4.8, the efficiency of the motor 10 reaches the highest, which is 95%.

[0052] Please refer to Table 1 and Figure 3 , as (R 2 / R 1 )×(S 1 / S 2 ) increases, the overload capacity of the motor 10 first gradually increases and then gradually decreases. When 4 < (R 2 / R 1 )×(S 1 / S 2 ) < 5.5, the overload capacity multiple of the motor 10 is higher than 1.15 times. Among them, when (R 2 / R 1 )×(S 1 / S 2 ) = 4.8, the overload capacity of the motor 10 reaches the highest, which is 1.5 times.

[0053] Table 1: Relationship table of (R 2 / R 1 )×(S 1 / S 2 ) with motor efficiency and overload capacity multiple

[0054] <![CDATA[(R 2 / R 1 )×(S 1 / S 2 )]]> Motor efficiency / % Overload capacity multiple 3.6 92.4 0.8 3.8 92.9 0.95 4 93.4 1.15 4.2 93.8 1.3 4.6 94.6 1.45 4.8 95 1.5 5 94.8 1.45 5.2 94.2 1.35 5.5 93.4 1.15 5.7 92.9 0.97 6 92.4 0.8

[0055] In an embodiment, 0.6 ≤ R 1 / R 2 ≤ 0.65.

[0056] When R 1 / R 2 ≥ 0.65, it may cause the thickness of the stator core 210 to be relatively thin, so that the structural strength of the stator core 210 is relatively low; it may also cause the outer diameter of the stator core 210 to be relatively small, which will limit the size and number of windings, thereby affecting the peak current carrying capacity of the motor 10. When R 1 / R 2 ≤ 0.6, it may cause the thickness of the stator core 210 to be relatively thick, thereby increasing the eddy current loss and reducing the efficiency and overload capacity of the motor 10; it may also cause the outer diameter of the stator core 210 to be relatively large, resulting in an increase in magnetic resistance, thereby increasing the iron loss and reducing the efficiency of the motor 10. Therefore, when 0.6 ≤ R 1 / R 2When it is ≤ 0.65, the stator core 210 has an appropriate thickness, which not only ensures a certain structural strength of the stator core 210 but also reduces iron loss, thereby improving the efficiency and overload capacity of the motor 10.

[0057] In one embodiment, 0.6 ≤ R 1 / R 2 ≤ 0.62.

[0058] Furthermore, 0.6 ≤ R 1 / R 2 ≤ 0.62 can further optimize the thickness and the inner and outer diameters of the stator core 210. While ensuring a certain structural strength of the stator core 210, it reduces the iron loss of the motor stator 200 and improves the efficiency and overload capacity of the motor 10.

[0059] In one embodiment, the maximum outer circular contour radius of the stator core 210 is R 1 , 40 mm ≤ R 1 ≤ 95 mm.

[0060] When R 1 > 95 mm, the inner diameter of the stator core 210 is too large, thereby increasing the iron loss of the motor stator 200 and reducing the efficiency of the motor 10. At the same time, the volume and weight of the motor stator 200 are too large. When R 1 < 40 mm, the inner diameter of the stator core 210 is too small, which will limit the size and number of windings, thereby affecting the peak current carrying capacity of the motor 10. At the same time, it will also limit the size of the motor rotor 100, thereby reducing the efficiency of the motor 10. When 40 mm ≤ R 1 ≤ 95 mm, the size of the stator core 210 is more reasonable, which not only ensures a certain structural strength of the stator core 210 but also reduces iron loss and improves the efficiency and overload capacity of the motor 10. Furthermore, 45 mm ≤ R 1 ≤ 55 mm.

[0061] In one embodiment, the minimum inner circular contour radius of the stator core 210 is R 2 , 20 mm ≤ R 2 ≤ 40 mm.

[0062] When R 2 > 40 mm, the outer diameter of the stator core 210 is too large, thereby increasing the iron loss of the motor stator 200 and reducing the efficiency of the motor 10. At the same time, the volume and weight of the motor stator 200 are too large. When R 2 < 20 mm, it may limit the number and size of windings and affect the overload capacity. When 20 mm ≤ R 2When it is ≤ 40 mm, the size of the stator core 210 is more reasonable, which not only ensures a certain structural strength of the stator core 210, but also reduces iron loss and improves the efficiency and overload capacity of the motor 10. Further, 25 mm ≤ R 2 ≤ 35 mm.

[0063] In an embodiment, 7.1 < S 1 / S 2 < 10.

[0064] By restricting the ratio of S 1 / S 2 such that the copper loss within the area S 1 of a single stator slot reaches a balance with the iron loss within the area S 2 of the permanent magnet 120 under a single pole, thereby improving the efficiency and overload capacity of the motor 10.

[0065] Please refer to Table 2 and Figure 4 , as S 1 / S 2 increases, the efficiency of the motor 10 first gradually increases and then gradually decreases. When 7.1 < S 1 / S 2 < 10, the efficiency of the motor 10 is higher than 94%. Among them, when 8 < S 1 / S 2 < 9, the efficiency of the motor 10 is further improved and is higher than 95%.

[0066] Please refer to Table 2 and Figure 5 , as S 1 / S 2 increases, the overload capacity of the motor 10 first gradually increases and then gradually decreases. When 7.1 < S 1 / S 2 < 10, the overload capacity multiple of the motor 10 is higher than 1.15 times. Among them, when 8 < S 1 / S 2 < 9, the overload capacity of the motor 10 is further improved and is higher than 1.5 times.

[0067] Table 2: Relationship table of S 1 / S 2 with motor efficiency and overload capacity multiple

[0068]

[0069]

[0070] Further, 7.2 < S 1 / S 2 < 7.8.

[0071] In one embodiment, the area of the cross-section of a single stator slot 213 intercepted by a plane perpendicular to the axis of the stator core 210 is S 1 , 100 mm 2 ≤ S 1 ≤ 400 mm 2 .

[0072] When S 1 > 400 mm 2 , the winding resistance is too large, thereby increasing the copper loss, which will affect the efficiency of the motor 10. When S 1 < 100 mm 2 , the number of windings in the stator slot 213 is small, which is not conducive to improving the peak current and load-carrying capacity of the motor 10. When 100 mm 2 ≤ S 1 ≤ 400 mm 2 , the efficiency and load-carrying capacity of the motor 10 can be improved. Further, 130 mm 2 ≤ S 1 ≤ 150 mm 2 .

[0073] In one embodiment, the area of the cross-section of the permanent magnet 120 under a single magnetic pole intercepted by a plane perpendicular to the axis of the rotor core 110 is S 2 , 10 mm 2 ≤ S 2 ≤ 75 mm 2 .

[0074] When S 2 > 75 mm 2 , the magnetic flux is too large, which will cause magnetic circuit saturation and increase the iron loss (hysteresis loss and eddy current loss), thereby reducing the efficiency of the motor 10. When S 2 < 10 mm 2 , the magnetic flux passing through the stator core 210 is small, which is not conducive to improving the output power of the motor 10. When 10 mm 2 ≤ S 2 ≤ 75 mm 2 , it can ensure that there is more magnetic flux passing through the stator core 210 and reduce the risk of magnetic circuit saturation, thereby improving the efficiency of the motor 10. Further, 15 mm 2 ≤ S 2 ≤ 22 mm 2 .

[0075] In one embodiment, a plurality of permanent magnets 120 form 2P magnetic poles in the circumferential direction of the rotor core 110, and 1 < Q / 2P < 3.

[0076] 2P is the number of magnetic poles formed in the circumferential direction of the rotor core 110, and P is the number of magnetic pole pairs of the motor rotor 100. Different ratios of Q / 2P can have different effects on the waveform quality and ripple torque of the back EMF, thereby having an important impact on the back EMF characteristics and energy efficiency of the motor 10. Higher waveform quality and lower cogging torque help reduce energy loss. Therefore, in order to reduce the tooth harmonic magnetic field and reduce torque fluctuations, the number of stator slots 213 and the number of magnetic pole pairs are usually optimized.

[0077] The ratio of Q / 2P determines the magnetic field interaction between the motor stator 200 and the motor rotor 100. Different slot ratios will affect the fundamental magnetic flux density distribution of the motor 10, and thus affect the performance of the motor 10. When there is no good match between the two, higher tooth harmonics may be generated, resulting in additional losses and torque fluctuations, thereby affecting the efficiency and noise level of the motor 10. When 1<Q / 2P<3, there is a better ratio between the number of stator slots 213 and the number of pole pairs, which helps to obtain a more uniform magnetic flux density distribution, improve the symmetry of the magnetic circuit, improve the waveform quality, reduce losses and torque fluctuations, reduce cogging torque, and reduce the noise of the motor 10; at the same time, it also helps and contributes to better utilization of magnetic flux, indirectly improves the anti-demagnetization ability of the motor 10, and ultimately improves the efficiency and overload capacity of the motor 10.

[0078] In one embodiment, the number of the stator slots 213 is Q, and 15≤Q≤18.

[0079] A larger number of stator slots 213 can reduce magnetic resistance, increase magnetic flux, and help improve the efficiency of the motor 10; it can evenly distribute magnetic flux, reduce cogging effect, and help reduce cogging torque; it can improve the waveform quality of the back EMF, making it closer to the ideal sinusoidal waveform; it can improve the magnetic flux distribution, reduce torque fluctuations caused by the interaction between magnetic poles, and improve the anti-demagnetization ability. However, at the same time, more slots may require more space, thereby increasing the volume or weight of the motor 10, thereby reducing the power density and increasing the manufacturing cost. When 15≤Q≤18, the volume and manufacturing cost of the motor 10 can be controlled while optimizing the magnetic flux distribution, improving the waveform quality of the back EMF, reducing cogging torque and torque fluctuations, improving the anti-demagnetization ability, and improving the efficiency and overload capacity of the motor 10.

[0080] In one embodiment, the plurality of permanent magnets 120 form 2P magnetic poles in the circumferential direction of the rotor core 110 , where 10≤2P≤12.

[0081] A larger number of magnetic poles can increase the complexity of the magnetic circuit, but at the same time increase the total cross-sectional area of the magnetic circuit, which helps to increase the magnetic flux; it can better disperse the magnetic flux, thereby reducing the sudden change of magnetic flux density, reducing the cogging effect, and helping to reduce the cogging torque; it can improve the waveform quality of the back electromotive force and make it closer to the ideal sine waveform; it can improve the magnetic flux distribution, reduce the torque ripple caused by the interaction between magnetic poles, and improve the demagnetization resistance. However, at the same time, it may require more space for more slots, thus increasing the volume or weight of the motor 10, and further reducing the power density. At the same time, a larger number of magnetic poles will also increase the production cost. When 10 ≤ 2P ≤ 12, it is possible to control the volume and manufacturing cost of the motor 10 while optimizing the magnetic flux distribution, improving the waveform quality of the back electromotive force, reducing the cogging torque and torque ripple, improving the demagnetization resistance, and improving the efficiency and overload capacity of the motor 10.

[0082] In one embodiment, Q / 2P = 3 / 2.

[0083] By limiting the ratio of the number of stator slots 213 to the number of magnetic poles of the motor rotor 100 to 3 / 2, it is possible to control the volume and manufacturing cost of the motor 10 while optimizing the magnetic flux distribution, improving the waveform quality of the back electromotive force, reducing the cogging torque and torque ripple, improving the demagnetization resistance, and improving the efficiency and overload capacity of the motor 10. In one embodiment, the number of stator slots 213 is 15, and the number of magnetic poles of the motor rotor 100 is 10. In another embodiment, the number of stator slots 213 is 18, and the number of magnetic poles of the motor rotor 100 is 12.

[0084] In one embodiment, the permanent magnet slots 111 are linear, arc-shaped, "V"-shaped, "U"-shaped or "W"-shaped in a plane perpendicular to the axis of the rotor core 110.

[0085] The permanent magnet slots 111 can be linear, arc-shaped, "U"-shaped, "V"-shaped or "W"-shaped. Among them, a linear permanent magnet 120 is correspondingly embedded in the linear permanent magnet slot 111; an arc-shaped permanent magnet 120 is correspondingly embedded in the arc-shaped permanent magnet slot 111. The "U"-shaped, "V"-shaped or "W"-shaped permanent magnet slots 111 are formed by combining and embedding multiple linear or arc-shaped permanent magnets 120. Two linear permanent magnets 120 are embedded in the "V"-shaped permanent magnet slot 111, and the two permanent magnets 120 are in a "V" shape corresponding to the permanent magnet slot 111; two linear permanent magnets 120 and an arc-shaped permanent magnet 120 are embedded in the "U"-shaped permanent magnet slot 111, so that the three permanent magnets 120 are in a "U" shape corresponding to the permanent magnet slot 111. Of course, the permanent magnet slot 111 can also be trapezoidal in reverse. Three linear permanent magnets 120 are embedded in the trapezoidal-in-reverse permanent magnet slot 111, so that the three permanent magnets 120 are in a trapezoidal-in-reverse shape corresponding to the permanent magnet slot 111; four linear permanent magnets 120 are embedded in the "W"-shaped permanent magnet slot 111, and the four permanent magnets 120 are in a "W" shape corresponding to the permanent magnet slot 111.

[0086] In an embodiment, the permanent magnet slot 111 includes a plurality of slot segments, and each slot segment is embedded with a permanent magnet 120, S 2 is the sum of the cross-sectional areas of the multiple permanent magnets 120 under a single magnetic pole intercepted by a plane perpendicular to the axis of the rotor core 110.

[0087] A permanent magnet 120 is correspondingly embedded in the linear and arc-shaped permanent magnet slots 111, S 2 is the cross-sectional area of a permanent magnet 120 intercepted by a plane perpendicular to the axis of the rotor core 110.

[0088] Two permanent magnets 120 are embedded in the "V"-shaped permanent magnet slot 111, S 2 is the sum of the cross-sectional areas of the two permanent magnets 120 intercepted by a plane perpendicular to the axis of the rotor core 110.

[0089] Three permanent magnets 120 are embedded in the "U"-shaped permanent magnet slot 111, S 2 is the sum of the cross-sectional areas of the three permanent magnets 120 intercepted by a plane perpendicular to the axis of the rotor core 110.

[0090] Four permanent magnets 120 are embedded in the "W"-shaped permanent magnet slot 111, S 2 is the sum of the cross-sectional areas of the four permanent magnets 120 intercepted by a plane perpendicular to the axis of the rotor core 110.

[0091] The present utility model also provides a compressor, which includes a motor 10. The specific structure of the motor 10 refers to the above-mentioned embodiments. Since the compressor in the technical solution of the present utility model adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here.

[0092] The present utility model also provides a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above-mentioned embodiments. Refrigeration devices can be divided into compression refrigeration devices, absorption refrigeration devices, steam jet refrigeration devices, heat pump refrigeration devices, electro-thermal refrigeration devices, etc. Refrigeration devices mainly consist of a compressor, an expansion valve, an evaporator, a condenser and accessories, pipelines. Such as refrigerators, air conditioners, etc. Since the compressor in the technical solution of the present utility model adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here.

[0093] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A motor, characterized in that: include: A motor stator comprises a stator core, wherein the maximum outer contour radius of the stator core is R1, and the minimum inner contour radius of the stator core is R2; the stator core comprises a stator yoke and stator teeth, a plurality of stator teeth are arranged at intervals along the inner circumference of the stator yoke, a stator slot is formed between two adjacent stator teeth, and the cross-sectional area of ​​a single stator slot cut by a plane perpendicular to the axis of the stator core is S1; A motor rotor is arranged on the inner circumference of the motor stator, the motor rotor comprises a rotor core and permanent magnets, the rotor core is provided with a plurality of permanent magnet slots spaced apart along its circumference, the permanent magnets are embedded in the permanent magnet slots, so that the rotor core forms a plurality of magnetic poles, and the area of ​​the cross section of the permanent magnet under a single magnetic pole cut by a plane perpendicular to the axis of the rotor core is S2; Among them, 4<(R2 / R1)×(S1 / S2)<5.

5.

2. The motor according to claim 1, characterized in that 0.6≤R1 / R2≤0.

65.

3. The motor according to claim 2, characterized in that 0.6≤R1 / R2≤0.

62.

4. The motor according to claim 1, characterized in that 40mm≤R1≤95mm; And / or, 20mm≤R2≤40mm.

5. The motor according to claim 1, characterized in that 7.1<S1 / S2<10.

6. The motor according to claim 5, characterized in that 100mm 2 ≤S1≤400mm 2 ; and / or, 10mm 2 ≤S2≤75mm 2 .

7. The motor according to claim 1, characterized in that The plurality of permanent magnets form 2P magnetic poles in the circumferential direction of the rotor core, the number of the stator slots is Q, and Q and 2P satisfy: 1<Q / 2P<3.

8. The motor according to claim 7, characterized in that 15≤Q≤18。 9. The motor according to claim 7, characterized in that 10≤2P≤12。 10. The motor according to claim 7, characterized in that Q / 2P=3 / 2.

11. The motor according to claim 1, characterized in that The permanent magnet slots are linear, arc-shaped, "V"-shaped, "U"-shaped or "W"-shaped on a plane perpendicular to the axis of the rotor core.

12. The motor according to claim 11, characterized in that The permanent magnet slot includes a plurality of slot segments, each of which is embedded with a permanent magnet. S2 is the sum of the cross-sectional areas of the plurality of permanent magnets under a single magnetic pole taken along a plane perpendicular to the axis of the rotor core.

13. A compressor, characterized in that: Comprising the motor according to any one of claims 1 to 12.

14. A refrigeration device, characterized in that: Comprising the compressor of claim 13.

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