Motor stator, motor and compressor

Abstract

The technical scheme of the invention discloses a motor stator, a motor and a compressor, the motor stator comprises a stator yoke and stator teeth, the plurality of stator teeth are arranged at intervals along the inner circumference of the stator yoke, and a stator slot is formed between every two adjacent stator teeth; the linear distance between the inner circumferential wall of the stator yoke and the outer circumferential wall of the stator yoke is the stator yoke thickness h of the stator yoke, the minimum linear distance between the groove side wall of the stator groove and the groove side wall of the adjacent stator groove is the stator tooth width t of the stator tooth, and h and t meet the condition that t / h is larger than or equal to 0.85 and smaller than or equal to 0.95; the linear distance from the axis of the motor stator to the inner side surface of the stator tooth is the inner diameter D1 of the motor stator, the linear distance from the axis of the motor stator to the outer circumferential wall of the stator yoke is the outer diameter D2 of the motor stator, and D2 and D1 meet the condition that D1 / D2 is larger than or equal to 0.583 and smaller than or equal to 0.610; d2 and h meet the following formula: h = D2 / 2-d. According to the technical scheme, adjustment and optimization are carried out through D1, D2, h and t, motor torque pulsation and vibration and noise of the compressor can be reduced while the motor efficiency is guaranteed, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a motor stator, a motor and a compressor. Background Art

[0002] With social progress and economic development, people's living standards have significantly improved. When purchasing refrigeration equipment such as air conditioners and refrigerators, consumers are not only concerned about price but also about noise. The compressor is a core component of refrigerators and air conditioners, while the motor is the compressor's power output. The vibration and noise of the motor directly affect the vibration and noise levels of refrigerators, air conditioners, and other refrigeration equipment. Therefore, reducing compressor vibration and noise is a current challenge for those skilled in the art. Summary of the Invention

[0003] The main purpose of the present invention is to provide a motor stator, aiming to improve the noise of the compressor.

[0004] The technical solution of the present invention provides a motor stator, comprising:

[0005] stator yoke;

[0006] stator teeth, wherein a plurality of the stator teeth are spaced apart along the inner circumference of the stator yoke, and a stator slot is formed between two adjacent stator teeth;

[0007] The straight-line distance from the inner circumferential wall of the stator yoke to the outer circumferential wall of the stator yoke is the stator yoke thickness h of the stator yoke, the minimum straight-line distance between the slot side wall of the stator slot and the slot side wall of the adjacent stator slot is the stator tooth width t of the stator tooth, and h and t satisfy: 0.85≤t / h≤0.95; the straight-line distance from the axis of the motor stator to the inner side surface of the stator tooth is the inner diameter D1 of the motor stator, and the straight-line distance from the axis of the motor stator to the outer circumferential wall of the stator yoke is the outer diameter D2 of the motor stator, and D2 and D1 satisfy: 0.583≤D1 / D2≤0.610; D2 and h satisfy: h=D2 / 2-d.

[0008] In one embodiment, the number of the stator slots is Z, and t and D1 satisfy: 0.40≤Z*t / (π*D1)≤0.44.

[0009] The present invention further provides a motor, which includes the aforementioned motor stator and a motor rotor, wherein the motor stator is sleeved on the outer circumference of the motor rotor.

[0010] In one embodiment, the thickness of the motor stator along its axial direction is the stator thickness H, the remanence of the motor magnet at 20° C. is Br, and H and Br satisfy: 22.9≤H*Br*D1 / D2≤30.7.

[0011] In one embodiment, the thickness of the motor stator along its axial direction is the stator thickness H, and H and D1 satisfy: 0.175≤H*D1 / (D2) 2 ≤0.236.

[0012] In one embodiment, the maximum straight-line distance from the axis of the motor stator to the bottom of the stator slot is d, the remanence of the motor magnet at 20° C. is Br, and h and Br satisfy: 4.8≤(2*d-D1)Br / h≤5.1.

[0013] In one embodiment, the maximum straight-line distance from the axis of the motor stator to the bottom of the stator slot is d, the remanence of the motor magnet at 20° C. is Br, and h and Br satisfy: 5.3≤(2*d-D1)Br / h≤5.6.

[0014] In one embodiment, the number of the stator slots is Z, the number of magnetic poles of the motor is P, and P satisfies: Z / P=3 / 2, or Z / P=6 / 5.

[0015] The present invention also provides a compressor, comprising the aforementioned motor.

[0016] The technical solution of the present invention adjusts and optimizes the inner diameter D1 of the motor stator, the outer diameter D2 of the motor stator, the stator yoke thickness h and the stator tooth width t, and sets 0.85≤t / h≤0.95, 0.583≤D1 / D2≤0.610, and h=D2 / 2-d. While ensuring the motor efficiency, the motor torque pulsation and the vibration and noise of the compressor can be reduced, and the production cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 is a cross-sectional view perpendicular to the axis of a motor rotor according to an embodiment of the present invention;

[0019] Figure 2 is a cross-sectional view of a motor rotor along its axis according to an embodiment of the present invention;

[0020] Figure 3 It is a line graph showing the effect of t / h on efficiency and noise;

[0021] Figure 4 The line graph shows the effect of D1 / D2 on cost and temperature rise;

[0022] Figure 5 It is a line graph showing the effect of Z*t / (π*D1) on efficiency sound;

[0023] Figure 6 It is a line graph showing the impact of H*Br*D1 / D2 on cost and efficiency;

[0024] Figure 7 = H*D1 / (D2) 2 line graphs of impact on cost and efficiency;

[0025] Figure 8 A line graph showing the effect of (2*d-D1)Br / h on noise and efficiency in one embodiment;

[0026] Figure 9 FIG. 5 is a line graph showing the effect of (2*d-D1)Br / h on noise and efficiency in another embodiment.

[0027] Description of Figure Numbers:

[0028] Label name Label name 10 Motor stator 200 stator teeth 100 stator yoke 300 stator slots

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, 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 number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] Please refer to Figure 1 The present invention provides a motor stator 10, comprising a stator yoke 100 and stator teeth 200. A plurality of stator teeth 200 are arranged at intervals along the inner periphery of the stator yoke 100, and a stator slot 300 is formed between two adjacent stator teeth 200. The straight-line distance from the inner peripheral wall of the stator yoke 100 to the outer peripheral wall of the stator yoke 100 is the stator yoke thickness h of the stator yoke 100, and the minimum straight-line distance between the slot side wall of the stator slot 300 and the slot side wall of the adjacent stator slot 300 is the stator yoke thickness h. The stator tooth width t, h and t of the tooth 200 satisfy: 0.85≤t / h≤0.95; the straight-line distance from the axis of the motor stator 10 to the inner side surface of the stator tooth 200 is the inner diameter D1 of the motor stator 10, and the straight-line distance from the axis of the motor stator 10 to the outer peripheral wall of the stator yoke 100 is the outer diameter D2 of the motor stator 10, D2 and D1 satisfy: 0.583≤D1 / D2≤0.610; D2 and h satisfy: h=D2 / 2-d.

[0034] Specifically, the motor stator 10 includes a stator core and windings. The stator core is made of laminated silicon steel sheets. The stator core comprises a stator yoke 100 and stator teeth 200. The stator yoke 100 is annular, with multiple stator teeth 200 spaced along the inner side of the stator yoke 100. Adjacent stator teeth 200 define stator slots 300, and the number of stator slots 300 matches the number of stator teeth 200. The windings pass through the stator slots 300 and are directly wound around the stator teeth 200.

[0035] The stator yoke thickness h is the straight-line distance from the inner peripheral wall of the stator yoke 100 to the outer peripheral wall of the stator yoke 100 , and the stator tooth width t is the minimum straight-line distance between the slot sidewall of a stator slot 300 and the slot sidewall of an adjacent stator slot 300 .

[0036] Please refer to Figure 3When t / h is less than 0.85, the stator yoke thickness h is larger, the structural strength and rigidity of the motor stator 10 are greater, and the motor torque pulsation and the vibration and noise of the compressor are significantly reduced, with the noise level below 93dB. However, this also greatly increases the material consumption of the stator core, thereby increasing production costs. In addition, when the stator yoke thickness h is larger, the iron loss of the motor stator 10 is also greater, which will reduce the working efficiency of the motor. In addition, when the stator yoke thickness h is larger, the slot depth of the stator slot 300 is correspondingly smaller, and the windings that can be accommodated by the stator slot 300 will also be reduced, thereby reducing the working efficiency of the motor, and its working efficiency is below 50%.

[0037] When t / h>0.95, the stator yoke thickness h is small. Although the production cost and the iron loss of the motor stator 10 are reduced, the structural strength and stiffness of the motor stator 10 are small, and the motor torque pulsation and the vibration and noise of the compressor are large, with the noise being above 93db.

[0038] When 0.85 ≤ t / h ≤ 0.95, the motor stator 10 exhibits superior structural strength and rigidity, reducing motor torque pulsation and compressor vibration and noise, keeping noise below the noise benchmark and lowering production costs. Furthermore, the motor stator 10 exhibits low iron loss, and the stator slots 300 have a greater depth, which significantly reduces the number of windings they can accommodate. This ensures the motor's operating efficiency, exceeding the efficiency benchmark and potentially increasing it by over 10%.

[0039] The inner diameter D1 of the motor stator 10 is the straight-line distance from the axis of the motor stator 10 to the inner side surface of the stator teeth 200 , and the outer diameter D2 of the motor stator 10 is the straight-line distance from the axis of the motor stator 10 to the outer peripheral wall of the stator yoke 100 .

[0040] Please refer to Figure 4 When 0.85 ≤ t / h ≤ 0.95 and 0.583 ≤ D1 / D2 ≤ 0.610, the parameter settings for the stator yoke thickness h and tooth width t are further optimized. By adjusting and optimizing the inner diameter D1 and outer diameter D2 of the motor stator 10, the stator tooth width t is kept within a more reasonable range. The stator yoke thickness h is further optimized, achieving a better balance between reducing motor torque pulsation, compressor vibration, and noise, lowering production costs, and ensuring motor efficiency.

[0041] Optimizing the parameters of the inner diameter D1 and the outer diameter D2 of the motor stator 10 also improves the temperature rise of the motor. When D1 / D2≤0.610, the temperature rise of the motor is lower than the temperature rise standard, and has a good heat dissipation effect.

[0042] In addition, the inner diameter D1 and the outer diameter D2 of the motor stator 10 also directly affect the strength, rigidity, and production cost of the motor stator 10. When D1 / D2 is less than 0.583, the thickness of the motor stator 10 is relatively large, and the motor stator 10 has good strength and rigidity, which can reduce the motor torque pulsation and the vibration and noise of the compressor, but increases the production cost. When D1 / D2 is greater than 0.610, the thickness of the motor stator 10 is relatively small, which reduces the production cost, but the strength and rigidity of the motor stator 10 are relatively poor, and the motor torque pulsation and the vibration and noise of the compressor are relatively large. When 0.583≤D1 / D2≤0.610, a better balance is achieved between reducing the motor torque pulsation and the vibration and noise of the compressor and reducing the production cost.

[0043] The technical solution of the present invention adjusts and optimizes the inner diameter D1 of the motor stator, the outer diameter D2 of the motor stator, the stator yoke thickness h and the stator tooth width t, and sets 0.85≤t / h≤0.95, 0.583≤D1 / D2≤0.610, and h=D2 / 2-d. While ensuring the motor efficiency, the motor torque pulsation and the vibration and noise of the compressor can be reduced, and the production cost can be reduced.

[0044] In one embodiment, the number of stator slots 300 is Z, the straight-line distance from the axis of the motor stator 10 to the inner side surface of the stator tooth 200 is the inner diameter D1 of the motor stator 10, and t and D1 satisfy: 0.40≤Z*t / (π*D1)≤0.44.

[0045] Please refer to Figure 1 and Figure 5 The inner diameter D1 of the motor stator 10 is the straight-line distance from the axis of the motor stator 10 to the inner side of the stator tooth 200. By adjusting and optimizing the inner diameter D1 of the motor stator 10 and the number of stator slots 300, the stator tooth width t is within a more reasonable range, and the setting of the stator yoke thickness h is further optimized, thereby achieving a better balance between reducing the motor torque pulsation and the vibration and noise of the compressor, reducing production costs and ensuring the working efficiency of the motor. When 0.85≤t / h≤0.95, 0.583≤D1 / D2≤0.610, and 0.40≤Z*t / (π*D1)≤0.44, the parameter settings of the stator yoke thickness h and the tooth width t are further optimized, the working efficiency of the motor is above 92%, and is higher than the efficiency benchmark, and the working efficiency of the motor is further improved.

[0046] Specifically, through 0.583≤D1 / D2≤0.610, the size of the inner diameter D1 of the motor stator 10 can be obtained, thereby ensuring the strength of the motor stator and reducing production costs; further, through 0.40≤Z*t / (π*D1)≤0.44, the size of the stator tooth width t can be obtained, thereby improving the motor performance; further, through 0.85≤t / h≤0.95, h=D2 / 2-d, the size of the stator yoke thickness h can be obtained, thereby reducing the motor noise while improving the working efficiency of the motor, thereby optimizing the performance of the motor in all aspects.

[0047] In one embodiment, the thickness of the motor stator 10 along its axial direction is the stator thickness H, the remanence of the motor magnet at 20° C. is Br, and H and Br satisfy: 22.9≤H*Br*D1 / D2≤30.7.

[0048] Please refer to Figure 1 、 Figure 2 and Figure 6 The motor stator 10 includes a stator core formed by stacking silicon steel plates. The thickness of the motor stator 10 along its axial direction is the thickness of multiple layers of silicon steel sheets stacked together. The motor rotor includes a rotor core formed by stacking silicon steel plates. The permanent magnet is embedded in the rotor core. After the permanent magnet is magnetized to saturation, the external magnetic field is removed and it can still maintain a certain magnetization intensity in the original external magnetic field direction. The remaining magnetization intensity is the remanence of the motor magnet. The motor magnet has a high magnetic flux ratio and high structural strength. The rotor core is driven by the magnetic action of the permanent magnet, and the motor rotor can rotate relative to the motor stator 10 to achieve normal operation of the motor.

[0049] The remanence of a motor magnet at 20°C is Br. By optimizing the parameters for the remanence Br and stator thickness H, we can maintain motor efficiency while reducing costs. The motor's efficiency increases first and then decreases with the increase in H*Br*D1 / D2. When 22.9 ≤ H*Br*D1 / D2 ≤ 30.7, the motor's efficiency exceeds the efficiency benchmark, reaching a maximum of 92.5%. When H*Br*D1 / D2 ≤ 30.7, the motor's cost is lower than the cost benchmark.

[0050] In one embodiment, the thickness of the motor stator 10 along its axial direction is the stator thickness H, and H and D1 satisfy: 0.175≤H*D1 / (D2) 2 ≤0.236.

[0051] Please refer to Figure 1 、 Figure 2 and Figure 7The motor stator 10 includes a stator core formed from laminated silicon steel sheets. The axial thickness of the motor stator 10 is the thickness of the stacked layers of silicon steel sheets. By optimizing the stator thickness H and the inner diameter D1 of the motor stator 10, the motor's operating efficiency is maintained while reducing costs.

[0052] The working efficiency of the motor is as H*D1 / (D2) 2 The increase first increases and then decreases. When H*D1 / (D2) 2 <0.175, and 0.583≤D1 / D2≤0.610, the stator thickness H is small and the motor efficiency is low. 2 >0.236, and 0.583≤D1 / D2≤0.610, the stator thickness H is large, and the production cost increases. When 0.175≤H*D1 / (D2) 2 When ≤0.236, the working efficiency of the motor is higher than the efficiency benchmark, and can reach up to 92.5%. At the same time, the cost of the motor is lower than the cost benchmark.

[0053] In one embodiment, the maximum straight-line distance from the axis of the motor stator 10 to the bottom of the stator slot 300 is d, the remanence of the motor magnet at 20° C. is Br, and h and Br satisfy: 4.8≤(2*d-D1)Br / h≤5.1.

[0054] Please refer to Figure 1 and Figure 8 The iron loss of the motor stator 10 is positively correlated with the volume of the stator yoke 100 and the magnetic flux density of the motor. The larger the volume of the stator yoke 100, the greater the iron loss of the motor stator 10, and the lower the working efficiency of the motor. When (2*d-D1)Br / h<4.8, the stator yoke thickness h is large, the iron loss of the motor stator 10 is large, and the working efficiency of the motor is low. When (2*d-D1)Br / h>5.1, the stator yoke thickness h is small, the structural strength and rigidity of the motor stator 10 are small, the motor torque pulsation and the vibration and noise of the compressor are large. When 4.8≤(2*d-D1)Br / h≤5.1, the working efficiency of the motor is higher than the efficiency benchmark, and can reach up to 92.5%. At the same time, the noise of the motor is lower than the noise benchmark and can be controlled below 65db. While ensuring good working efficiency, the motor can also reduce the motor torque pulsation and the vibration and noise of the compressor.

[0055] In another embodiment, the maximum straight-line distance from the axis of the motor stator 10 to the bottom of the stator slot 300 is d, the remanence of the motor magnet at 20° C. is Br, and h and Br satisfy: 5.3≤(2*d-D1)Br / h≤5.6.

[0056] Please refer to Figure 1 and Figure 9Unlike the previous embodiment, this embodiment uses a different type of motor rotor with greater residual magnetism. When 5.3 ≤ (2*d - D1) Br / h ≤ 5.6, the motor's operating efficiency exceeds the efficiency benchmark, reaching a maximum of 92.5%. Meanwhile, the motor's noise level is below the noise benchmark, controlled to below 65dB. While maintaining high operating efficiency, the motor also reduces motor torque pulsation and compressor vibration and noise.

[0057] In one embodiment, the number of stator slots 300 is Z, the number of magnetic poles of the motor is P, and P satisfies: Z / P=3 / 2, or Z / P=6 / 5.

[0058] Please refer to Figure 1 When Z / P = 3 / 2, the motor rotor has 4 magnetic poles and 6 stator slots 300; alternatively, the motor rotor has 8 magnetic poles and 12 stator slots 300. When Z / P = 6 / 5, the motor rotor has 10 magnetic poles and 12 stator slots 300. By selecting the appropriate number of magnetic poles and stator slots 300, the harmonic content in the motor can be reduced, thereby reducing motor vibration, noise, and energy loss, improving motor operating efficiency and stability, increasing motor power density, optimizing the motor's magnetic field distribution, and enhancing torque generation and speed response, enabling faster and more stable motor startup.

[0059] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since this compressor adopts all the technical solutions of all 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 described one by one here.

[0060] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A motor stator, characterized in that: include: stator yoke; stator teeth, wherein a plurality of the stator teeth are spaced apart along the inner circumference of the stator yoke, and a stator slot is formed between two adjacent stator teeth; The straight-line distance from the inner circumferential wall of the stator yoke to the outer circumferential wall of the stator yoke is the stator yoke thickness h of the stator yoke, the minimum straight-line distance between the slot side wall of the stator slot and the slot side wall of the adjacent stator slot is the stator tooth width t of the stator tooth, and h and t satisfy: 0.85≤t / h≤0.95; the straight-line distance from the axis of the motor stator to the inner side surface of the stator tooth is the inner diameter D1 of the motor stator, and the straight-line distance from the axis of the motor stator to the outer circumferential wall of the stator yoke is the outer diameter D2 of the motor stator, and D2 and D1 satisfy: 0.583≤D1 / D2≤0.610; D2 and h satisfy: h=D2 / 2-d.

2. The motor stator according to claim 1, characterized in that: The number of the stator slots is Z, and t and D1 satisfy: 0.40≤Z*t / ≤0.

44.

3. A motor, characterized in that: The motor comprises the motor stator according to any one of claims 1 to 2, wherein the motor further comprises a motor rotor, and the motor stator is sleeved on the outer circumference of the motor rotor.

4. The motor according to claim 3, wherein The thickness of the motor stator along its axial direction is the stator thickness H, the remanence of the motor magnet at 20° C. is Br, and H and Br satisfy the following: 22.9≤H*Br*D1 / D2≤30.

7.

5. The motor according to claim 3, wherein The thickness of the motor stator along its axial direction is the stator thickness H, and H and D1 satisfy: 0.175≤H*D1 / 2 ≤0.

236.

6. The motor according to claim 3, wherein The maximum straight-line distance from the axis of the motor stator to the bottom of the stator slot is d, the remanence of the motor magnet at 20° C. is Br, and h and Br satisfy: 4.8≤Br / h≤5.

1.

7. The motor according to claim 3, wherein The maximum straight-line distance from the axis of the motor stator to the bottom of the stator slot is d, the remanence of the motor magnet at 20° C. is Br, and h and Br satisfy: 5.3≤Br / h≤5.

6.

8. The motor according to claim 3, wherein The number of the stator slots is Z, the number of magnetic poles of the motor is P, and P satisfies: Z / P=3 / 2, or Z / P=6 / 5.

9. A compressor, characterized in that: The motor comprises the motor as claimed in any one of claims 3 to 8.

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