Motor, compressor and refrigeration equipment

Abstract

The utility model discloses a motor, compressor and refrigeration equipment, relates to refrigeration equipment technical field, the motor comprises a stator and a rotor, the rotor comprises a rotor iron core and a permanent magnet, the rotor iron core is provided with a magnet groove, the permanent magnet is installed in the rotor iron core and is located in the magnet groove, and the rotor iron core is provided with a magnet. The width of the permanent magnet is W, the thickness of the permanent magnet is t, and t2 / W is larger than or equal to 0.1 and smaller than or equal to 0.12; according to the technical scheme provided by the utility model, the cost of the permanent magnet and the motor is reduced, the demagnetization resistance of a single magnet is optimized, the eddy current loss of the magnet is reduced, and the efficiency of the motor is 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] An air compressor is a kind of electromechanical equipment widely used in modern industry. It can convert electric energy into mechanical energy and is widely used in various mechanical equipment. The efficiency and performance of an electric motor mainly depend on the design and manufacturing process of the electric motor. Among them, the permanent magnet is an important part of the motor rotor, and its quality and performance directly affect the efficiency and performance of the electric motor.

[0003] The conventional way to improve the demagnetization resistance of the permanent magnet structure of an electric motor is usually to develop better permanent magnet materials or to strictly control the magnetic field and temperature during the magnetization process of permanent magnet production. However, with the gradual maturity of the permanent magnet production and processing technology, its further improvement space is limited, and it will also greatly increase the production cost of permanent magnets. Summary of the Utility Model

[0004] The main object of the utility model is to provide an electric motor, a compressor and a refrigeration equipment, aiming to reduce the costs of the permanent magnet and the electric motor, optimize the demagnetization resistance of a single magnet, reduce the eddy current loss of the magnet and improve the efficiency of the electric motor.

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

[0006] A stator; and

[0007] A rotor, a rotor core and a permanent magnet. The rotor core is provided with magnet slots, the permanent magnet is installed on the rotor core and is located in the magnet slots. The width of the permanent magnet is W, the thickness of the permanent magnet is t, and 0.1 ≤ t2 / W ≤ 0.12.

[0008] In one embodiment, 5 mm < W < 25 mm.

[0009] In one embodiment, 0.5 mm < t < 2.5 mm.

[0010] In one embodiment, 1.2 mm < t < 2 mm.

[0011] In one embodiment, the stator includes a stator core, and the stator core is provided with stator slots. When the number of stator slots is 15 and the number of pole pairs of the rotor is 5, 1.3 mm < t < 1.5 mm.

[0012] In one embodiment, the permanent magnet includes a plurality of permanent magnet segments, and the plurality of permanent magnet segments are distributed along the axial direction of the rotor core. The length of each permanent magnet segment along the axial direction of the rotor core is less than 60 mm.

[0013] In one embodiment, the magnetic pole direction of the permanent magnet is consistent with the radial direction of the rotor core.

[0014] In one embodiment, the minimum inner diameter of the stator is D 1 , and the maximum outer diameter of the rotor is D 2 , 0.33 ≤ (D 1 - D 2 ) / 2t ≤ 0.4.

[0015] In one embodiment, the stator includes a stator core, stator slots are provided on the stator core, the number of stator slots is Q, the number of pole pairs of the rotor is P, and 2 ≤ W / t / (Q - 2P) ≤ 2.4.

[0016] In one embodiment, 15 ≤ Q ≤ 18.

[0017] In one embodiment, 5 ≤ P ≤ 6.

[0018] In one embodiment, the number of phases of the motor is m, the number of slots per pole per phase of the motor is q, q = Q / 2mP, and q < 1.

[0019] The present utility model also provides a compressor, including the motor as described above.

[0020] The present utility model also provides a refrigeration device, including the compressor as described above.

[0021] The rotor in the technical solution of the present utility model includes a rotor core and a permanent magnet. A magnet slot is provided on the rotor core. The permanent magnet is installed on the rotor core and is located in the magnet slot. The width of the permanent magnet is W, and the thickness of the permanent magnet is t. 0.1 ≤ t2 / W ≤ 0.12. The present utility model designs the relationship between the width and thickness of the permanent magnet to be 0.1 ≤ t2 / W ≤ 0.12. Actually, it is thinner than the thickness of the permanent magnet in the prior art. By reducing the thickness of the permanent magnet, the production and processing cost of the permanent magnet is reduced. However, reducing the thickness of the permanent magnet will reduce the demagnetization ability of the magnet. And by designing the relationship between the width and thickness of the permanent magnet to be 0.1 ≤ t2 / W ≤ 0.12, the demagnetization ability of the permanent magnet is maximized, thereby optimizing the demagnetization resistance of a single magnet, reducing the eddy current loss of the magnet, and improving the motor efficiency. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying 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.

[0023] Figure 1 Structural schematic diagram of a rotor according to an embodiment provided by the present invention;

[0024] Figure 2 For Figure 1 Structural schematic diagram of the rotor when the permanent magnet is in a V shape;

[0025] Figure 3 For Figure 1 Structural schematic diagram of the rotor when the permanent magnet is in a U shape;

[0026] Figure 4 For Figure 1 Structural schematic diagram of another embodiment of the permanent magnet;

[0027] Figure 5 Experimental data table of the calculation data of t2 / W and the corresponding motor efficiency;

[0028] Figure 6 Schematic diagram of the change of motor efficiency with t2 / W;

[0029] Figure 7 For (D 1 -D 2 ) / 2t and the experimental data table of the corresponding motor efficiency;

[0030] Figure 8 For the change of motor efficiency with (D 1 -D 2 ) / 2t;

[0031] Figure 9 Experimental data table of the calculation data of W / t / (Q - 2P) and the corresponding motor efficiency;

[0032] Figure 10 Schematic diagram of the change of motor efficiency with W / t / (Q - 2P).

[0033] Explanation of the reference numerals in the drawings:

[0034] 11. Rotor core; 111. Magnet slot; 12. Permanent magnet; 21. Rivet hole; 22. Shaft hole; 23. Current-carrying hole.

[0035] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific Embodiments

[0036] The technical solutions in the embodiments of the present utility model will be clearly and completely described below 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0037] 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 positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] 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, or 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.

[0039] Referring to Figures 1 to 4 , the present utility model provides a motor, comprising:

[0040] A rotor core 11, on which a magnet slot 111 is provided; and

[0041] A permanent magnet 12, which is installed on the rotor core 11 and is located in the magnet slot 111. The permanent magnet 12 includes a plurality of permanent magnet segments, and the plurality of permanent magnet segments are distributed along the axial direction of the rotor core 11. The width of the permanent magnet 12 is W, and the thickness of the permanent magnet 12 is t, where 0.1 ≤ t2 / W ≤ 0.12.

[0042] The rotor in the technical solution of the present utility model includes a rotor core 11 and a permanent magnet 12. The rotor core 11 is provided with a magnet slot 111. The permanent magnet 12 is installed on the rotor core 11 and is located within the magnet slot 111. The width of the permanent magnet 12 is W, and the thickness is t, where 0.1 ≤ t² / W ≤ 0.12. In the technical solution of the present utility model, the relationship between the width and thickness of the permanent magnet 12 is designed to be 0.1 ≤ t² / W ≤ 0.12, which actually makes the thickness of the permanent magnet 12 thinner than that in the prior art. By reducing the thickness of the permanent magnet 12, the production and processing cost of the permanent magnet 12 is reduced. However, reducing the thickness of the permanent magnet 12 will decrease the demagnetization ability of the magnet. By designing the relationship between the width and thickness of the permanent magnet 12 to be 0.1 ≤ t² / W ≤ 0.12, the demagnetization ability of the permanent magnet 12 is maximized, thereby optimizing the demagnetization resistance of a single magnet and reducing the eddy current loss of the magnet to improve efficiency.

[0043] Referring to Figures 2 to 4 , further, the thickness t of the permanent magnet is the distance between two parallel sides of the permanent magnet, and the width W 3 of the permanent magnet is the distance between two parallel sides. Therefore, when the corners of the permanent magnet are chamfered, it does not affect the width and thickness of the permanent magnet.

[0044] Referring to Figure 5 and Figure 6 , Figure 5 is the experimental data table of the calculation data of t² / W and the corresponding motor efficiency. Figure 6 is the schematic diagram of the change of the motor efficiency with t² / W. From Figure 5 and Figure 6 , it can be seen that when t² / W ≤ 0.11, the motor efficiency increases with the increase of the t² / W value; when t² / W > 0.11, the motor efficiency decreases with the increase of the t² / W value; however, when within the range of 0.1 ≤ t² / W ≤ 0.12, the motor efficiency can always be maintained within a relatively high range, and within this range, the change value of the motor efficiency is small, the motor efficiency is relatively stable, and it can meet the actual working requirements.

[0045] Specifically, 5mm < W < 25mm. It can be understood that if W³ ≥ 25mm, at this time the width of the permanent magnet 12 is relatively large. Although the magnetic field strength is relatively high at this time, the volume of the permanent magnet 12 is also increased, thereby increasing the cost of the motor; if W³ ≤ 5mm, then the magnetic field strength may be difficult to meet the requirements of the motor. Therefore, in this embodiment, 5mm < W³ < 25mm is set, so as to reasonably set the width of the permanent magnet 12, thereby reducing the cost of the motor while also making the magnetic strength of the permanent magnet 12 meet the requirements of the motor.

[0046] Specifically, 0.5 mm < t < 2.5 mm. It can be understood that if t ≥ 2.5 mm, that is, the thickness of the permanent magnet 12 is relatively thick at this time. Although the magnetic field strength of the permanent magnet 12 is relatively high at this time, it will also increase the volume of the permanent magnet 12, thereby increasing the cost of the motor. If t ≤ 0.5 mm, the efficiency of the motor and the energy efficiency of the compressor can be improved at this time. Therefore, in this embodiment, 0.5 mm < t < 2.5 mm is set, so as to reasonably set the thickness of the permanent magnet 12, thereby reducing the cost of the motor while also ensuring that the magnetic strength of the permanent magnet 12 meets the requirements of the motor.

[0047] Furthermore, when 1.2 mm < t < 2 mm, by further optimizing the thickness of the permanent magnet, the utilization rate of the magnet can reach a better level, thereby improving the efficiency of the motor and the energy efficiency of the compressor.

[0048] Furthermore, the stator includes a stator core, and stator slots are provided on the stator core. When the number of slots of the stator slots is 15 and the number of pole pairs of the rotor is 5, 1.3 mm < t < 1.5 mm. That is, when there are 15 stator slots and the number of pole pairs of the rotor is 5, the thickness of the permanent magnet is set between 1.3 mm and 1.5 mm at this time, so as to further optimize the magnetic field distribution of the motor, thereby further improving the utilization rate of the magnet, and further improving the efficiency of the motor and the energy efficiency of the compressor. It should be noted that the stator slots are used for winding the windings.

[0049] In an embodiment, the permanent magnet 12 includes a plurality of permanent magnet segments, and the plurality of permanent magnet segments are distributed along the axial direction of the rotor core 11. The length of each permanent magnet segment along the axial direction of the rotor core 11 is less than 60 mm. That is, when the length of the permanent magnet 12 along the axial direction of the rotor core 11 is greater than or equal to 60 mm, the permanent magnet 12 is divided into multiple permanent magnet segments, thereby reducing the processing difficulty of the permanent magnet 12. At the same time, the size of the segmented permanent magnet segments is smaller, thereby also reducing the damage during transportation.

[0050] It should be noted that when the total length of the permanent magnet 12 in the axial direction of the rotor core 11 is 60 mm, in one embodiment, the length of each permanent magnet segment in the axial direction of the rotor core 11 can be the same. That is, at this time, the permanent magnet can be set as two permanent magnet segments in the axial direction of the rotor core 11, and the lengths of the two permanent magnet segments in the axial direction of the rotor core 11 are both 30 mm. The permanent magnet segments with the same length are convenient for processing and transportation. Of course, in another embodiment, in order to cope with different usage scenarios, the lengths of each permanent magnet segment in the axial direction can also be different. That is, at this time, the permanent magnet 12 can be set as two permanent magnet segments in the axial direction of the rotor core 11, and the lengths of the two permanent magnet segments in the axial direction of the rotor core 11 are 50 mm and 10 mm respectively to meet the requirements of different scenarios.

[0051] In one embodiment, the magnetic pole direction of the permanent magnet 12 is consistent with the radial direction of the rotor core 11. That is, at this time, the topological structure of the rotor is radial, and at this time, the rotor core 11 is radially distributed outward. That is, a plurality of the permanent magnets 12 are arranged along the circumference of the rotor core 11, and the plurality of permanent magnets 12 are arranged with their heads and tails opposite to each other. It should be noted that the two magnetic poles, the N pole and the S pole, of the permanent magnet 12 are respectively located on both sides of the thickness direction of the permanent magnet 12.

[0052] The radial topological structure of the rotor has the following advantages: 1. Small leakage magnetic coefficient: Since the radial structure enables the permanent magnets 12 to be arranged along the radius direction of the rotor, this structure helps to reduce the leakage of magnetic flux outside the rotor, thereby reducing the leakage magnetic coefficient. A smaller leakage magnetic coefficient means that more magnetic flux can be effectively utilized to generate electromagnetic torque, improving the efficiency of the motor. 2. No need for isolation measures on the rotor: The design of the radial structure makes the permanent magnets 12 arranged closely on the rotor, reducing the possibility of magnetic flux leakage. Therefore, no additional isolation measures are required to prevent the influence of magnetic flux on other parts of the motor. This simplifies the structure of the motor and reduces the manufacturing cost. 3. Easy control of the pole arc coefficient: In the radial structure, by adjusting the shape, size and quantity of the permanent magnets 12, the pole arc coefficient can be relatively easily controlled, thereby achieving precise control of the motor performance. This helps to meet different application requirements and optimize the motor performance. 4. High mechanical strength of the rotor punching: The radial structure makes the permanent magnets 12 evenly distributed on the rotor core, which helps to improve the mechanical strength of the rotor punching. Stronger mechanical strength means that the rotor can withstand greater torque and higher speed, improving the reliability and durability of the motor. 5. The rotor is not easily deformed after installing the permanent magnets 12: Since the radial structure enables the permanent magnets 12 to be tightly embedded in the rotor core, this structure helps to reduce the deformation of the rotor during high-speed rotation. A stable rotor shape helps to maintain the stable performance of the motor, reducing vibration and noise.

[0053] In one embodiment, the minimum inner diameter of the stator is D 1 , and the maximum outer diameter of the rotor is D 2 , 0.33 ≤ (D 1 - D 2 ) / 2t ≤ 0.4. (D 1 - D 2 ) / 2 is the air gap of the motor. It can be understood that if the air gap decreases or increases too much, the efficiency of the motor will decrease. Because too small an air gap will increase the friction loss inside the motor, and too large an air gap will not only lead to a weakening of the magnetic field strength, reducing the efficiency of the motor, but also make the motor rotate unstably, causing collisions inside the motor and increasing the vibration. (D 1 - D 2) / 2t represents the relationship between the air gap of the motor and the thickness of the permanent magnet.

[0054] Understandably, when the air gap increases and the thickness of the permanent magnet 12 decreases, the magnetic flux of the motor increases at this time, and then the back electromotive force increases, the current decreases, and the copper loss decreases, but the iron loss increases. Therefore, it is necessary to keep (D 1 -D 2 ) / 2t within a reasonable range to improve the efficiency of the motor. Refer to Figure 7 and Figure 8 , Figure 7 is the experimental data table of the calculation data of (D 1 -D 2 ) / 2t and the corresponding motor efficiency. Figure 8 is the schematic diagram of the change of the motor efficiency with (D 1 -D 2 ) / 2t. From Figure 7 and Figure 8 , it can be seen that when (D 1 -D 2 ) / 2t ≤ 0.36, the motor efficiency increases with the increase of the value of (D 1 -D 2 ) / 2t; when (D 1 -D 2 ) / 2t > 0.36, the motor efficiency decreases with the increase of the value of t2 / W; however, when 0.33 ≤ t2 / W ≤ 0.4, the efficiency of the motor can always be maintained within a relatively high range, and within this range, the change value of the motor efficiency is small, the motor efficiency is relatively stable, and it can meet the actual working requirements.

[0055] In an embodiment, the stator includes a stator core, stator slots are provided on the stator core, the number of slots of the stator slots is Q, the number of pole pairs of the rotor is P, and 2 ≤ W / t / (Q - 2P) ≤ 2.4. When the width of the permanent magnet increases and the thickness decreases, the magnetic flux of the motor increases at this time, and then the back electromotive force increases, the current decreases, and the copper loss decreases, but the iron loss increases. Therefore, it is necessary to design W / t / (Q - 2P) within a reasonable range to improve the efficiency of the motor.

[0056] Furthermore, W / t / (Q - 2P) represents the relationship between the size of the permanent magnet and the stator slots and the number of pole pairs of the rotor, that is, the distribution of the permanent magnet 12 in the motor. Refer to Figure 9 and Figure 10 , Figure 9 is the experimental data table of the calculation data of W / t / (Q - 2P) and the corresponding motor efficiency. Figure 10 is the schematic diagram of the change of the motor efficiency with W / t / (Q - 2P). From Figure 9 and Figure 10It can be seen that when W / t / (Q - 2P) < 2.2, the efficiency of the motor gradually increases with the increase of W / t / (Q - 2P). When W / t / (Q - 2P) > 2.2, the efficiency of the motor gradually decreases with the increase of W / t / (Q - 2P). And when 2 ≤ W / t / (Q - 2P) ≤ 2.4, the efficiency of the motor can always maintain a relatively high level, which can meet the requirements in actual work.

[0057] In one embodiment, 15 ≤ Q ≤ 18. The number of stator slots Q ranges from 15 to 18. It can be understood that the number of stator slots Q within this range can provide relatively balanced performance. It is neither too small to affect the efficiency and torque of the motor, nor too large to cause a significant increase in manufacturing cost. Moreover, restricting the number of stator slots Q to between 15 and 18 helps to provide a more uniform magnetic field distribution, thereby reducing the magnetic field non-uniformity and improving the efficiency and performance of the motor. Secondly, restricting the number of stator slots Q to between 15 and 18 can make the magnetic field of the motor more uniform, reduce the magnetic field fluctuation, and thus reduce the noise of the motor. At the same time, it also helps to reduce the vibration of the motor. Compared with motors with a higher number of slots, motors with 15 to 18 slots may have an advantage in manufacturing cost because they do not require excessive winding coils and insulation materials, reducing the manufacturing difficulty and cost. Restricting the number of stator slots Q of stator slot 13 to between 15 and 18 can improve the efficiency and torque density of the motor. Although increasing the number of stator slots Q of stator slot 13 can further improve these performance parameters, relatively high efficiency and torque can already be achieved within the range of 15 to 18.

[0058] In one embodiment, 5 ≤ P ≤ 6. Motors with a pole pair number P between 5 and 6 can achieve a better balance between torque and speed. Compared with motors with a relatively small number of pole pairs, motors with a pole pair number P between 5 and 6 have higher torque and lower speed, and are suitable for application scenarios that require high torque and low speed. And compared with motors with a larger number of pole pairs, motors with a pole pair number P between 5 and 6 can avoid problems such as the increase in the motor body size and rotor inertia caused by too many pole pairs, thus maintaining a relatively high efficiency.

[0059] In one embodiment, the number of phases of the motor is m, and the number of slots per pole per phase of the motor is q, where q = Q / (2mP) and q < 1. The number of slots per pole per phase q is equal to the ratio of the number of stator slots to twice the product of the number of rotor pole pairs and the number of phases of the motor, and the number of slots per pole per phase q is made less than 1, so that a fractional-slot motor can be formed as a whole. Under the action of the fractional-slot motor, the cogging torque induced by the rotor permanent magnet magnetic field can be effectively weakened. Moreover, the fractional-slot motor can effectively increase the equivalent number of slots per pole per phase. This means that with the same number of slots, the fractional-slot motor can obtain better distribution performance, making the motor waveform closer to a sine wave. This helps to improve the efficiency and performance of the motor. Secondly, the fractional-slot motor can effectively weaken the per-pole magnetic flux pulsation caused by the change of air-gap permeance, thereby reducing the pulsation amplitude. This helps to improve the electromotive force waveform and reduce the pulsation loss, and improve the operating efficiency and stability of the motor. Since the fractional-slot motor uses fewer slots to obtain the same distribution performance as an integral-slot winding with a large number of slots, its number of slots is relatively small, and it has good processability. This helps to reduce the manufacturing cost of the motor and improve the production efficiency. Furthermore, the torque characteristics of the fractional-slot motor are usually better, and the torque ripple is smaller. This is because the fractional-slot motor can optimize the magnetic field distribution, reduce the harmonic components, and thus reduce the torque ripple. This makes the fractional-slot motor have an advantage in applications that require high-precision control and stable operation.

[0060] It can be understood that after reasonably setting the magnet width, thickness, stator tooth width, and stator yoke thickness parameters and their proportional relationships through the technical solution of the present invention, when the temperature of the permanent magnet 12 is 20 °C, the remanence of the magnet is 1.3 T to 1.5 T. Remanence means the magnetic field strength that the permanent magnet 12 maintains itself after removing the external magnetic field. The remanence of 1.3 T to 1.5 T indicates that the permanent magnet 12 has strong magnetism at room temperature and can generate a significant magnetic field. Thus, it can be clearly shown that for the motor after reasonably coordinating the magnet width, thickness, stator tooth width, and stator yoke thickness, the magnetic strength of the permanent magnet 12 is higher, thereby improving the magnetic ability of the permanent magnet 12 and further improving the performance and energy efficiency of the motor.

[0061] Among them, the stator core is composed of a plurality of stator laminations stacked in sequence, and the rotor core 11 is composed of a plurality of rotor laminations stacked in sequence. By setting the stator laminations and rotor laminations as a plurality, when processing the stator core and the rotor core 11, only a plurality of stator laminations or rotor laminations need to be processed, and then the plurality of stator lamination and rotor lamination parts are assembled into the stator core and the rotor core 11. Compared with processing a complete stator core and rotor core 11, the difficulty of processing the stator laminations and rotor lamination parts is reduced, which is convenient for realizing the automated production of the stator core and the rotor core 11 through an automated production line, thereby reducing the production cost.

[0062] In one embodiment, the rotor core 11 and the stator core can be made of different materials or have different shapes, so as to meet the requirements of different processing technologies for the stator and the rotor, which is conducive to selecting appropriate punching sheets according to the performance requirements of the motor to form the rotor core 11 and the stator core, thereby ensuring good performance of the electrode and at the same time expanding the applicable range of the motor. In another embodiment, the stator punching sheets stacked to form the stator core are the same as the rotor punching sheets stacked to form the rotor core 11, which is conducive to mass production of the punching sheets and reduces the manufacturing cost.

[0063] In the related art, to ensure that the rotor core 11 does not have problems such as loose sheets or interlayer misalignment, or to ensure that the rotor core 11 does not deform due to the offset of the rotor core 11 punching layers during the winding process of the coil winding, it is required that the motor core has sufficient stacking and riveting strength. In order to ensure that the motor core can have sufficient stacking and riveting strength, therefore, in this embodiment, a plurality of rivet holes 21 are provided on the rotor core 11. Through the cooperation of the rivets and the rivet holes 21, the fixing strength between the silicon steel sheets can be satisfied, thereby avoiding the problem of interlayer misalignment of the silicon steel sheets during subsequent processing.

[0064] It should be noted that in order to reduce or even avoid the problem of interlayer eddy current conduction caused by this stacking and riveting structure, the rotor punching sheets can be adhesively bonded with glue instead of the stacking and riveting method, which can prevent the insulation surface layer of the silicon steel sheets at the rivet holes 21 from being damaged, thereby avoiding the problem of interlayer eddy current conduction. However, because the glue is expensive and the production line production efficiency is low, it has not been applied to the motors of air-conditioning compressors.

[0065] In this embodiment, a shaft hole 22 and a through-flow hole 23 are further provided on the rotor core 11. The shaft hole 22 is used to install a transmission shaft to drive the driven object to rotate; after the motor is used for a long time, its temperature is likely to rise, which may easily cause the permanent magnet 12 to demagnetize, resulting in the loss or reduction of the magnetism of the permanent magnet 12. Therefore, in this embodiment, by providing a through-flow hole 23 on the rotor core 11, a refrigerant flows through the through-flow hole 23, and the temperature of the rotor core 11 can be reduced through the refrigerant, so as to maintain the permanent magnet 12 within the optimal range, thereby improving the performance of the motor.

[0066] The present utility model also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above embodiment. Since the compressor in the technical solution of the present utility model adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0067] The present utility model further provides a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above-mentioned embodiments. Refrigeration devices can be classified into compression refrigeration devices, absorption refrigeration devices, steam jet refrigeration devices, heat pump refrigeration devices, electrothermal refrigeration devices, etc. The refrigeration device mainly consists of a compressor, an expansion valve, an evaporator, a condenser, and accessories and 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 all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0068] 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 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: stator; and A rotor, a rotor core and a permanent magnet, wherein the rotor core is provided with a magnet slot, the permanent magnet is mounted on the rotor core and is located in the magnet slot, the width of the permanent magnet is W, the thickness of the permanent magnet is t, and 0.1≤t2 / W≤0.

12.

2. The motor according to claim 1, characterized in that 5mm <W<25mm。 3. The motor according to claim 1, characterized in that 0.5mm <t<2.5mm。 4. The motor according to claim 1, characterized in that 1.2mm <t<2mm。 5. The motor according to claim 1, characterized in that The stator comprises a stator core, and the stator core is provided with stator slots. When the number of the stator slots is 15 and the number of the pole pairs of the rotor is 5, 1.3 mm <t<1.5mm。 6. The motor according to claim 1, characterized in that The permanent magnet includes a plurality of permanent magnet segments, which are distributed along the axial direction of the rotor core, and the length of each permanent magnet segment along the axial direction of the rotor core is less than 60 mm.

7. The motor according to claim 1, characterized in that The magnetic pole direction of the permanent magnet is consistent with the radial direction of the rotor core.

8. The motor according to claim 1, characterized in that The minimum inner diameter of the stator is D1, the maximum outer diameter of the rotor is D2, and 0.33≤(D1-D2) / 2t≤0.

4.

9. The motor according to claim 1, characterized in that The stator comprises a stator core, the stator core is provided with stator slots, the number of the stator slots is Q, the number of pole pairs of the rotor is P, and 2≤W / t / (Q-2P)≤2.

4.

10. The motor according to claim 9, characterized in that 15≤Q≤18。 11. The motor according to claim 9, characterized in that 5≤P≤6。 12. The motor according to claim 9, characterized in that The number of phases of the motor is m, the number of slots per pole and per phase of the motor is q, q=Q / 2mP, q<1.

13. A compressor, characterized in that: Comprising a motor as claimed in any one of claims 1 to 12.

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

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