Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment, relates to the motor technical field, the motor comprises a stator core and a rotor core, a stator punching sheet of the stator core comprises a stator yoke and a plurality of stator teeth distributed along the inner circumference of the stator yoke at intervals, two adjacent stator teeth and the stator yoke enclose a stator groove, and the stator yoke is provided with a plurality of stator teeth. The number of the stator slots is Q, the maximum outer circle contour radius of the stator punching sheet is R1, and the minimum inner circle contour radius of the stator punching sheet is R2; the rotor core is formed by stacking a plurality of rotor punching sheets, the rotor punching sheets are provided with a plurality of magnetic steel grooves along the circumferential direction, magnetic steel is installed in the magnetic steel grooves, so that the rotor core forms a plurality of magnetic poles which are alternately distributed along the circumferential direction, the number of the magnetic poles is 2P, and the greatest common divisor of 2P and Q is N; 2.5 < = N * (R2 / R1) < = 3.5, and the unit of R1 and R2 is mm. According to the technical scheme provided by the utility model, the motor magnetic flux and the motor rotational inertia under each magnetic pole of the motor are improved, and the motor power density and the motor efficiency are further improved.

Description

Technical Field

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

[0002] With the increasing requirements for energy conservation, environmental protection and comfort in the air-conditioning industry, the indexes of the efficiency and noise of air-compressed permanent magnet motors are constantly improved, and the challenges of motor design are becoming greater and greater. In the fields of motor design and manufacturing, motor noise and efficiency have always been the key performance indexes concerned by engineers and technicians. With the continuous improvement of the requirements for motor performance, how to reduce motor noise and improve efficiency through effective design improvements has become a research hotspot in the industry.

[0003] In the related art, generally, by optimizing the magnetic steel topology structure, improving the magnetization intensity and magnetization stability of the magnetic steel, etc., to improve its magnetic performance, and then improving the motor efficiency. However, the effect brought by this optimization method is becoming more and more limited and difficult to meet the growing demand for improving the motor efficiency. Summary of the Utility Model

[0004] The main object of the utility model is to propose a motor, a compressor and a refrigeration device, aiming to improve the magnetic flux per pole and the moment of inertia of the motor, and further improve the power density and efficiency of the motor.

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

[0006] A stator core, which is formed by stacking a plurality of stator punching sheets. The stator punching sheet includes a stator yoke and a plurality of stator teeth spaced along the inner circumference of the stator yoke. Adjacent two of the stator teeth and the stator yoke enclose a stator slot. The number of the stator slots is Q. The maximum outer circle contour radius of the stator punching sheet is R1, and the minimum inner circle contour radius of the stator punching sheet is R2; and

[0007] A rotor core, which is formed by stacking a plurality of rotor punching sheets. The rotor punching sheet is provided with a plurality of magnetic steel slots in the circumferential direction. Magnets are installed in the magnetic steel slots, so that the rotor core forms a plurality of magnetic poles alternately distributed in the circumferential direction. The number of magnetic poles is 2P, and the greatest common divisor of 2P and Q is N;

[0008] Satisfy 2.5≤N×(R2÷R1)≤3.5, where the units of R1 and R2 are mm.

[0009] In an embodiment, R1 and R2 satisfy: 0.6≤R2÷R1≤0.65.

[0010] In an embodiment, R1 and R2 satisfy: 0.6≤R2÷R1≤0.62.

[0011] In an embodiment, the maximum outer circle contour radius of the rotor punching is R3, and the minimum inner circle contour radius of the rotor punching is R4, satisfying: 0.6 ≤ R3÷(R4×N) ≤ 1.2, where the units of R3 and R4 are mm.

[0012] In an embodiment, the thickness of the permanent magnet is h, satisfying: 0.005 ≤ h÷(2P×N 2 ) ≤ 0.012, where the unit of h is mm.

[0013] In an embodiment, the maximum outer circle contour radius R1 of the stator punching satisfies: 40 ≤ R1 ≤ 95.

[0014] In an embodiment, the number Q of the stator slots and the number of magnetic poles 2P satisfy: Q÷(2×P) < 3.

[0015] In an embodiment, the number Q of the stator slots satisfies: 15 ≤ Q ≤ 18.

[0016] In an embodiment, the number of magnetic poles 2P satisfies: 10 ≤ 2P ≤ 12.

[0017] The present utility model further provides a compressor, and the compressor includes the motor as described above.

[0018] The present utility model further provides a refrigeration device, and the refrigeration device includes the compressor as described above.

[0019] The technical solution of the present utility model is to distribute a plurality of stator teeth circumferentially along the inner side of the stator yoke, so that the stator teeth extend radially and enclose a central hole for the rotation of the rotor core. The adjacent two stator teeth and the corresponding parts of the stator yoke enclose a stator slot. Correspondingly, a plurality of permanent magnet slots are formed in the circumferential direction of the rotor core, so that the rotor core forms a plurality of magnetic poles that are alternately distributed in the circumferential direction. The number of magnetic poles is 2P, and the greatest common divisor of 2P and Q is N; N is associated with the maximum outer circle contour radius R1 and the minimum inner circle contour radius R2 of the stator punching, so that the value of N×(R2÷R1) is between 2.5 and 3.5. In this way, by limiting the ratio of the maximum outer circle contour radius in the stator core to match the number of stator slots and the number of rotor poles, the magnetic flux and the rotor moment of inertia of the motor are optimized. On this basis, by selecting a reasonable relationship between the number Q of stator slots and the number of rotor poles 2P, the harmonic torque can be further reduced, the magnetic flux of the electrode under each magnetic pole and the moment of inertia of the motor can be increased, and the motor loss can be reduced, so as to ensure that the motor has better motor power density and efficiency under the given design conditions, thereby meeting the user's usage requirements. Description of the Drawings

[0020] 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 for the description of the embodiments or the prior art. Obviously, the drawings in the following description 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.

[0021] Figure 1 Schematic diagram of the cross-section of an embodiment of the motor provided by the present invention;

[0022] Figure 2 For Figure 1 Partial enlarged view at A in

[0023] Figure 3 Magnetic flux change diagram of the motor provided by the present invention;

[0024] Figure 4 Power density change diagram of the motor provided by the present invention;

[0025] Figure 5 Efficiency change diagram of the motor provided by the present invention;

[0026] Figure 6 Magnetic flux change diagram of another embodiment of the motor provided by the present invention;

[0027] Figure 7 Power density change diagram of another embodiment of the motor provided by the present invention;

[0028] Figure 8 Efficiency change diagram of another embodiment of the motor provided by the present invention;

[0029] Figure 9 Magnetic flux change diagram of yet another embodiment of the motor provided by the present invention;

[0030] Figure 10 Power density change diagram of yet another embodiment of the motor provided by the present invention;

[0031] Figure 11 Efficiency change diagram of yet another embodiment of the motor provided by the present invention.

[0032] Explanation of the reference numerals in the drawings:

[0033] 100, stator core; 110, stator yoke; 120, stator teeth; 130, stator slots; 200, rotor core; 210, magnet slots; 220, shaft hole; 300, magnet.

[0034] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to 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 creative efforts shall fall within the protection scope of the present utility model.

[0036] 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, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, 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 of such features. 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 the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. 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 protection scope required by the present utility model.

[0038] In the prior art, in order to improve the efficiency of the motor, the topological structure of the permanent magnet is usually optimized to improve the magnetization intensity of the permanent magnet, thereby improving the motor efficiency. However, the improvement space of this optimization method is limited, and it is easy to increase the hysteresis loss and iron loss, resulting in noise problems. For example, for a 10-slot 10-pole motor, by changing the topological structure of the permanent magnet, the motor power density under the conventional structure is 4700 kw / m 3 , which is difficult to meet the requirements of users for motor efficiency.

[0039] The present utility model proposes a motor.

[0040] Please refer to Figure 1 、 Figure 2 and Figures 3 - 5, in an embodiment of the present utility model, the motor includes:

[0041] A stator core 100, which is formed by stacking a plurality of stator laminations. The stator lamination includes a stator yoke 110 and a plurality of stator teeth 120 spaced along the inner circumference of the stator yoke 110. An adjacent pair of stator teeth 120 and the stator yoke 110 enclose a stator slot 130. The number of stator slots 130 is Q. The maximum outer circular contour radius of the stator lamination is R1, and the minimum inner circular contour radius of the stator lamination is R2; and

[0042] A rotor core 200, which is formed by stacking a plurality of rotor laminations. The rotor lamination is provided with a plurality of magnet slots 210 in the circumferential direction. Magnets 300 are installed in the magnet slots 210. The magnets 300 cause the rotor core to form a plurality of magnetic poles alternately distributed in the circumferential direction. The greatest common divisor of the number of magnetic poles 2P and Q is N;

[0043] Satisfy 2.5 ≤ N×(R2÷R1) ≤ 3.5, where the units of R1 and R2 are mm.

[0044] The technical solution of the present utility model distributes a plurality of stator teeth 120 along the inner circumference of the stator yoke 110, so that the stator teeth 120 extend in the radial direction and enclose a central hole for the rotation of the rotor core 200. An adjacent pair of stator teeth 120 and the corresponding part of the stator yoke 110 enclose a stator slot 130. Correspondingly, a plurality of magnet slots 210 are formed in the circumferential direction of the rotor core 200. The magnets 300 cause the rotor core 200 to form a plurality of magnetic poles alternately distributed in the circumferential direction. The number of magnetic poles is 2P. The greatest common divisor of the number of stator slots 130, Q, and the number of magnetic poles, 2P, is N. N is associated with the maximum outer circular contour radius R1 and the minimum inner circular contour radius R2 of the stator lamination, so that the value of N×(R2÷R1) is between 2.5 and 3.5. In this way, by limiting the ratio of the maximum outer circular contour radius in the stator core 100 to match the number of stator slots 130 and the number of rotor poles, the magnetic flux and the rotor moment of inertia of the motor are optimized. On this basis, by selecting a reasonable relationship between the number of stator slots 130, Q, and the number of magnet slots 210, P, the harmonic torque can be further reduced, the magnetic flux per magnetic pole and the moment of inertia of the motor can be increased, and the motor loss can be reduced, so as to ensure that the motor has better motor power density and efficiency under the given design conditions, thereby meeting the user's usage requirements.

[0045] It should be noted that in motor design, the greatest common divisor N of Q and 2P can be regarded as a measure of "commonality" or "periodicity" between these two parameters. A larger N indicates that the number of stator slots Q and the number of magnetic poles 2P have a higher degree of "coordination" or "synchronization" to a certain extent, which is beneficial to motor performance and energy efficiency, etc. In addition, the maximum outer circular contour radius R1 of the stator punching is expressed as: the maximum distance between the outer peripheral edge of the stator punching and the axis of the stator punching; the minimum inner circular contour radius R2 of the stator punching is expressed as the minimum distance between the inner peripheral edge of the stator punching and the axis of the stator punching; similarly, the maximum outer circular contour radius R3 of the rotor punching is expressed as: the maximum distance between the outer peripheral edge of the rotor punching and the axis of the rotor punching, and the minimum inner circular contour radius R4 of the rotor punching is expressed as: the minimum distance between the inner peripheral edge of the rotor punching and the axis of the rotor punching.

[0046] When the maximum outer circular contour radius of the stator punching is known, the power density of the motor has a linear relationship with the ratio of the maximum outer circular contour radius of the stator punching within a certain range. This means that a reasonable selection of the ratio of the maximum outer circular contour radius is the key to improving the power and torque density of the motor; among them, if the minimum inner circular contour radius of the stator punching is too small, the energy excited by the rotor may be consumed too quickly, while if the minimum inner circular contour radius is too large, the output power of the motor may be reduced. Therefore, a reasonable ratio of the maximum outer circular contour radius helps to reduce energy loss and improve the efficiency of the motor; moreover, a larger ratio of the maximum outer circular contour radius on the stator punching may lead to an increase in the volume and weight of the motor, while a smaller ratio may limit the power output of the motor, that is, the ratio of the maximum outer circular contour radius of the stator punching also determines the overall size and weight of the motor. Therefore, when the units of R1 and R2 are millimeters, it is specified that N×(R2÷R1) is between 2.5 and 3.5, so as to match the size of the stator core 100 with the acting force between the stator and the rotor, and take values within a better range to give full play to the role of each parameter, thereby improving the efficiency of the motor. Specifically, when the units of R1 and R2 are millimeters, N×(R2÷R1) can be 2.5, 2.89, 3.0, 3.01 or 3.5, etc.

[0047] Among them, the drawings of the present utility model only show one embodiment. Features such as an oil return groove can also be provided on the stator punching and a flow through hole can be provided on the rotor punching. In addition, when the outer periphery of the stator punching is a complete circle, the value of the maximum outer circular contour radius R1 of the stator punching can be directly measured, and the measured maximum value is taken as the maximum outer circular contour radius R1 of the stator punching; when the outer periphery of the stator punching is in the form of a non-complete circle with grooves, after determining a complete circle with the three outermost points on the outer periphery of the stator punching, the measured maximum value is taken as the maximum outer circular contour radius R1 of the stator punching. The principle of obtaining the value of the maximum outer circular contour radius R3 of the rotor punching in the following text is similar to that of the maximum outer circular contour radius R1 of the above-mentioned stator punching.

[0048] As shown Figure 1 in the figure, in this embodiment, for the forming of the rotor core 200, a plurality of rotor punching sheets are stacked to form the rotor core 200 by passing rivets through the rivet holes or other fixing means. Similarly, a plurality of stator punching sheets are formed into the stator core 100 by buckling or directly stacking, and then a stable stator is formed by winding. In addition, all the defined ranges in this embodiment are in millimeters for h, R1, R2, R3, and R4. The defined range has no longer any association with the unit of the parameters. The purpose of defining the unit is to reasonably value each parameter.

[0049] Please refer to Figures 3 to 6 , for N×(R2÷R1), when the value of N×(R2÷R1) is 2.5, the motor magnetic flux is 280 wb, the motor efficiency is 93.3%, and the power density of the motor is 5900 kW / m 3 ; when the value of N×(R2÷R1) is 3, the motor magnetic flux is 290 wb, the motor efficiency is 93.5%, and the power density of the motor is 6000 kW / m 3 , here, the magnetic flux, efficiency, and power density of the motor are all at the peak values; when the value of N×(R2÷R1) is 3.5, the motor magnetic flux is 280 wb, the motor efficiency is 93.2%, and the power density of the motor is 5900 kW / m 3 ; among them, when the value of N×(R2÷R1) is anywhere between 2.5 and 3.5, the motor magnetic flux is above 280 wb, the motor efficiency is above 93%, and the motor power density is above 5900 kW / m 3 or more.

[0050] In one embodiment, please refer to Figure 1 , R1 and R2 satisfy: 0.6 ≤ R2÷R1 ≤ 0.65. It can be understood that a motor with stator punching sheets having this ratio belongs to a large inner diameter motor. The magnetic flux of the permanent magnets on the rotor is relatively large, which can optimize the electromagnetic load of the motor, improve the torque density and power density of the motor, and thus help to improve the overall performance of the motor. At the same time, a larger center hole also helps to reduce the motor temperature rise, improve the running stability and life of the motor. In addition, a larger center hole of the stator punching sheet can also make the magnetic field distribution more uniform, reduce the harmonic content and stray losses, and thus improve the efficiency of the motor. Further, the value of R2÷R1 can also be between 0.6 and 0.62. Specifically, the value of R2÷R1 is 0.6, 0.61, 0.62, 0.64, or 0.65, etc.

[0051] In one embodiment, please refer to Figure 1, the maximum outer circular contour radius of the rotor punching is R3, and the minimum inner circular contour radius of the rotor punching is R4, satisfying: 0.6 ≤ R3÷(R4×N) ≤ 1.2, where the units of R3 and R4 are mm. It should be noted that the middle part of the rotor has a shaft hole 220 for installing the rotating shaft. The minimum inner circular contour radius R4 of the rotor punching is the maximum radius of the shaft hole 220. In the proportional relationship of this embodiment, the magnetic flux density distribution inside the motor can be optimized, making the internal magnetic flux density distribution more uniform, thereby optimizing the electromagnetic performance of the motor and improving the efficiency and power density of the motor. At the same time, associating the proportional relationship between the maximum outer circular contour radius R3 and the minimum inner circular contour radius R4 of the rotor punching with the greatest common divisor N of the number Q of stator slots 130 and the number of pole pairs 2P can ensure that the size of the rotor punching is adapted to the electromagnetic torque, ensure the rotational stability of the rotor, and reduce mechanical losses and noise caused by vibration. Similarly, under this proportional relationship, the relationship between the size of the rotor core and the magnetic flux density inside the motor is in a good range, making the heat dissipation surface of the motor in a good range and improving the thermal stability of the motor. In addition, the relational expression between the maximum outer circular contour radius and the greatest common divisor N of the rotor punching enables the stiffness of the rotor to adapt to the current force between the rotor and the stator, avoiding material waste and increasing manufacturing costs. Specifically, in this embodiment, R3÷(R4×N) can be 0.6, 0.9, 1.0, or 1.2.

[0052] Among them, please refer to Figures 6 to 8 , for R3÷(R4×N), when the value of R3÷(R4×N) is 0.6, the magnetic flux of the motor is 280 wb, the motor efficiency is 93.3%, and the power density of the motor is 5900 kW / m3; when the value of R3÷(R4×N) is 0.9, the magnetic flux of the motor is 290 wb, the motor efficiency is 93.5%, and the power density of the motor is 6000 kW / m 3 , here, the magnetic flux, efficiency, and power density of the motor are all at their peaks; when the value of R3÷(R4×N) is 1.2, the magnetic flux of the motor is 280 wb, the motor efficiency is 93.2%, and the power density of the motor is 5900 kW / m 3 ; in addition, when the value of R3÷(R4×N) is anywhere between 0.6 and 1.2, the magnetic flux of the motor is above 280 wb, the motor efficiency is above 93%, and the motor power density is above 5900 kW / m 3 above.

[0053] In one embodiment, please refer to Figure 1 and Figure 2 , the thickness of the permanent magnet 300 is h, satisfying: 0.005 ≤ h÷(2P×N 2) ≤ 0.012. The unit of h is mm. It should be noted that the thickness of the permanent magnet 300 is referenced by its own shape. Usually, the distance between two parallel long sides of the permanent magnet 300 is the thickness h. For the thickness h of the permanent magnet 300, the thicker the permanent magnet 300 on the magnetic circuit, the greater the magnetic resistance, resulting in a smaller armature inductance; the operating point of the permanent magnet 300 will shift upward due to armature reaction and reduction of magnetic circuit magnetic resistance, thereby obtaining a higher air-gap magnetic density; the increase of the air-gap magnetic density helps the motor to provide the required torque with a smaller current, thereby reducing copper loss and improving efficiency; in addition, a thicker permanent magnet 300 can resist demagnetization, but an overly thick permanent magnet 300 will increase costs and may not necessarily bring a significant improvement in performance. For the formula h÷(2P×N 2 ), the thickness of the permanent magnet is matched with the magnetic flux density and electromagnetic torque. By adjusting the thickness of the permanent magnet 300, parameters such as the torque output, efficiency, and temperature rise of the motor are balanced to improve the compactness of the motor, and then a better torque density is achieved. At the same volume or weight, the motor can generate a greater torque, thereby improving the efficiency of the motor. Similarly, a motor with better compactness also helps to reduce mechanical vibration and electromagnetic noise during motor operation. Specifically, in this embodiment, the value of the formula h÷(2P×N 2 ) can be 0.005, 0.008, 0.010, or 0.012, etc.

[0054] Among them, please refer to Figures 9 to 11 , for h÷(2P×N 2 ), when the value of h÷(2P×N 2 ) is 0.005, the motor magnetic flux is 280 wb, the motor efficiency is 93.3%, and the power density of the motor is 5900 kW / m 3 ; when the value of h÷(2P×N 2 ) is 0.008, the motor magnetic flux is 290 wb, the motor efficiency is 93.5%, and the power density of the motor is 6000 kW / m 3 . Here, the magnetic flux, efficiency, and power density of the motor are all at their peaks; when the value of h÷(2P×N 2 ) is 0.012, the motor magnetic flux is 280 wb, the motor efficiency is 93.2%, and the power density of the motor is 5900 kW / m 3 ; in addition, when the value of h÷(2P×N 2 ) is anywhere between 0.005 and 0.012, the motor magnetic flux is above 280 wb, the motor efficiency is above 93%, and the motor power density is above 5900 kW / m 3 or more.

[0055] In one embodiment, please refer to Figure 1, the maximum outer circular contour radius R1 of the stator punching sheet satisfies: 40 ≤ R1 ≤ 95. The value of the maximum outer circular contour radius R1 of the stator punching sheet is obtained according to the above measurement requirements. In this embodiment, it is limited that the maximum outer circular contour radius R1 of the stator punching sheet is between 40 mm and 95 mm, which can adapt to the sizes of small and medium-sized motors such as current household appliances, industrial equipment, and electric vehicles, broadening the application scenarios of the motor. At the same time, the maximum outer circular contour radius of the stator affects key performance parameters such as the length of the magnetic circuit, magnetic flux density, iron loss, and magnetic leakage of the motor. The maximum outer circular contour radius of the stator within this range can flexibly design the motor according to the requirements of power, torque, and efficiency to achieve the best performance and cost-effectiveness. Specifically, the maximum outer circular contour radius R1 of the stator punching sheet can be 40 mm, 60 mm, 75 mm, or 95 mm.

[0056] In one embodiment, please refer to Figure 1 , the number Q of stator slots 130 and the number of poles 2P satisfy: Q÷(2×P) < 3. It can be understood that Q÷(2×P) < 3 controls the number of stator slots 130 to a certain extent, adaptively adjusts the number of stator slots 130, and improves the matching degree with the number of poles, thereby balancing the relationship between the motor speed and torque. For example, it can adapt to scenarios with low torque and high-speed operation. Similarly, appropriately reducing the number of poles can evenly distribute the magnetic field inside the motor. Specifically, the value of Q÷(2×P) can be 0.9, 1, 1.6, 2, or 2.4, etc.

[0057] In one embodiment, please refer to Figure 1 and Figure 2 , the number Q of stator slots 130 satisfies: 15 ≤ Q ≤ 18. According to the influence of the number of stator slots 130 on the magnetic flux distribution, winding layout, and heat dissipation performance of the motor, more stator slots 130 mean better heat dissipation and higher winding filling rate. Thus, when the number of stator slots 130 is between 15 and 18, it helps to reduce the harmonic magnetic field and harmonic leakage reactance, making the motor run more smoothly and reducing unnecessary energy losses. In addition, when the motor size remains unchanged, as the number of stator slots 130 increases, the corresponding stator slots 130 will become smaller, and the number of turns of the winding will also decrease accordingly, thereby reducing the reactance. This change is beneficial to the increase of the motor torque, enabling the motor to generate a greater torque under the same conditions and improving the load capacity of the motor. Of course, too many stator slots 130 will also increase the processing difficulty. Selecting the number of stator slots 130 between 15 and 18 can improve the motor torque well while ensuring the processing convenience of the stator slots 130. Of course, in other embodiments, the number of stator slots 130 can also be configured as 8, 9, or 10.

[0058] In one embodiment, please refer to Figure 1 and Figure 4, the number of rotor poles P satisfies: 10 ≤ P ≤ 12. It can be understood that the number of rotor poles determines the speed and torque characteristics of the motor. The more poles, the lower the speed, but the smaller the torque ripple. Thus, compared with a motor with a smaller number of rotor poles, in this embodiment, it is configured as a 10-pole motor to a 12-pole motor, which can have a lower speed at the same frequency, helping to reduce the mechanical noise during motor operation, making the motor run more quietly. Moreover, the torque output of the motor with the number of rotor poles in this range is smoother, and the peak torque relative to the rated torque of the motor will also decrease. This smooth torque output is beneficial to reducing mechanical shock and vibration, improving the running stability and lifespan of the motor. Of course, in other embodiments, the number of rotor poles can also be configured as 6, 8, or 14.

[0059] In one embodiment, please refer to Figure 1 and Figure 2 , at one end of the stator tooth 120 facing away from the stator yoke 110, the end face of the stator tooth 120 facing the rotor punching sheet is formed by connecting an arc segment and / or a straight segment. It should be noted that there is an air gap between the stator punching sheet and the rotor punching sheet. Setting the side of the stator tooth 120 facing the air gap as a combination of a straight segment and an arc segment can optimize the magnetic field distribution, make the distribution of magnetic flux in the air gap more uniform, thereby reducing local overheating and mechanical stress caused by uneven magnetic flux. Moreover, such stator teeth 120 can interact more effectively with the rotor magnetic field, generating a larger electromagnetic torque, helping the motor to produce a higher torque output under a given current, thereby improving the power density and efficiency of the motor. In addition, by optimizing the side of the stator tooth 120 facing the air gap to be a combination of a straight segment and an arc segment, the electromagnetic force can be dispersed and balanced, reducing the vibration and noise caused by uneven electromagnetic force, thereby reducing the noise and vibration generated during the operation of the motor. Among them, for a motor applied to a compressor, the rotor needs to supply refrigerant oil and refrigerant to flow, that is, the rotor works in a fluid (such as air or liquid). The shape of the air gap of the motor will affect the fluid flow. The end of the stator tooth 120 facing the air gap can be designed into a specific shape by combining an arc edge and a straight line to improve the hydrodynamic performance, such as reducing resistance, increasing lift, or improving heat dissipation performance. Thereby improving the operation efficiency of the motor or compressor.

[0060] The present utility model also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above embodiments. Since this compressor adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here. It should be noted that in this embodiment, as Figure 1As shown, the housing of the motor is the housing of the compressor. The motor is located in the cavity of the compressor. A flow-through hole 220 is formed on the rotor core 200 for the circulation of the refrigerating oil and refrigerant in the compressor cavity. Of course, in other embodiments, the housing of the motor and the housing of the compressor may also be independently provided.

[0061] The present utility model also provides a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above embodiments. Since this refrigeration device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one. Among them, 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. A refrigeration device mainly consists of a compressor, an expansion valve, an evaporator, a condenser, and accessories and pipelines. Such as refrigerators, air conditioners, etc.

[0062] The above description 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 any direct / indirect application 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 stator core, wherein the stator core is formed by stacking a plurality of stator punching sheets, the stator punching sheets include a stator yoke and a plurality of stator teeth spaced apart along the inner circumference of the stator yoke, two adjacent stator teeth and the stator yoke enclose a stator slot, the number of the stator slots is Q, the maximum outer circle contour radius of the stator punching sheets is R1, and the minimum inner circle contour radius of the stator punching sheets is R2; and A rotor core, wherein the rotor core is formed by stacking a plurality of rotor punchings, wherein the rotor punchings are provided with a plurality of magnetic steel slots along the circumferential direction, magnetic steels are installed in the magnetic steel slots, and the magnetic steels enable the rotor core to form a plurality of magnetic poles alternately distributed in the circumferential direction, wherein the number of magnetic poles is 2P, and the greatest common divisor of 2P and Q is N; Satisfies, 2.5≤N×(R2÷R1)≤3.5, wherein the units of R1 and R2 are mm.

2. The motor according to claim 1, characterized in that The R1 and the R2 satisfy: 0.6≤R2÷R1≤0.

65.

3. The motor according to claim 2, characterized in that The R1 and the R2 satisfy: 0.6≤R2÷R1≤0.

62.

4. The motor according to claim 1, characterized in that The maximum outer circle contour radius of the rotor punching sheet is R3, and the minimum outer circle contour radius of the rotor punching sheet is R4, which satisfies: 0.6≤R3÷(R4×N)≤1.2, wherein the units of R3 and R4 are mm.

5. The motor according to claim 1, characterized in that The thickness of the magnetic steel is h, which satisfies: 0.005≤h÷(2P×N 2 )≤0.012, where the unit of h is mm.

6. The motor according to claim 1, characterized in that The maximum outer circle contour radius R1 of the stator punching sheet satisfies: 40≤R1≤95.

7. The motor according to claim 1, characterized in that The number Q of the stator slots and the number 2P of the magnetic poles satisfy: Q÷(2×P)<3.

8. The motor according to claim 1, characterized in that The number Q of the stator slots satisfies: 15≤Q≤18.

9. The motor according to claim 1, characterized in that The number of magnetic poles 2P satisfies: 10≤2P≤12.

10. A compressor, characterized in that: Comprising a motor as claimed in any one of claims 1 to 9.

11. A refrigeration device, characterized in that: Comprising the compressor of claim 10.

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