Stator lamination, motor, compressor and refrigeration appliance

Abstract

The application discloses a stator lamination, a motor, a compressor and a refrigeration device, wherein the stator lamination comprises a ring-shaped stator yoke and a plurality of stator teeth which are distributed along the circumference of the ring-shaped stator yoke, so as to form a stator slot between any two adjacent stator teeth; a plurality of grooves are arranged on the side surface of the stator yoke away from the stator teeth in the circumferential direction; the cross-sectional area of the groove is S; the maximum width of the stator yoke is h; the outer diameter of the stator lamination is D1; the inner diameter of the stator lamination is D2; and the relationship among S, h, D1 and D2 is 0.07 <= 2S / [h(D1-D2)] <= 0.5. The technical scheme can improve the flow ratio of the stator core, improve the energy efficiency of the motor using the stator core and the compressor using the motor, and optimize the oil discharge of the compressor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a stator lamination, a motor, a compressor, and a refrigeration device. Background Technology

[0002] Most household air conditioner compressors currently use inverter motors. The compressor's mechanical structure requires lubricating oil to ensure normal operation and smooth refrigerant circulation. If the outer groove of the motor is not properly designed, it will increase the amount of oil discharged from the compressor, hindering refrigerant circulation. This will severely affect the compressor's energy efficiency, and the reduced lubrication will directly impact the product's lifespan. Summary of the Invention

[0003] The main objective of this invention is to provide a stator lamination designed to optimize the oil discharge of the compressor.

[0004] To achieve the above objectives, the present invention proposes a stator lamination comprising an annular stator yoke and a plurality of stator teeth spaced circumferentially along the annular stator yoke to form a stator slot between any two adjacent stator teeth. The stator yoke has a plurality of grooves along the circumferential direction on the side facing away from the stator teeth. The cross-sectional area of ​​the grooves is S, the maximum width of the stator yoke is h, the outer diameter of the stator lamination is D1, and the inner diameter of the stator lamination is D2. The relationship between S, h, D1, and D2 is: 0.07≤2S / [h(D1-D2)]≤0.5.

[0005] Optionally, the relationship between S, h, D1 and D2 is: 0.07≤2S / [h(D1-D2)]≤0.23.

[0006] Optionally, the relationship between S, h, D1 and D2 is: 0.15≤2S / [h(D1-D2)]≤0.18.

[0007] Optionally, the cross-sectional area S of the groove is in the range of 20 mm. 2 ≤S≤25mm 2 .

[0008] Optionally, the connecting line between two adjacent grooves is arranged as a straight line and / or a curve.

[0009] Optionally, the maximum width h of the stator yoke is in the range of 5mm ≤ h ≤ 6mm.

[0010] Optionally, the outer diameter D1 of the stator lamination is in the range of 85mm≤D1≤110mm.

[0011] Optionally, the inner diameter D2 of the stator lamination is in the range of 45mm≤D2≤60mm.

[0012] Optionally, the number of stator slots is Q, where Q ≥ 15.

[0013] The present invention also proposes an electric motor, the electric motor comprising a rotor lamination and the aforementioned stator lamination, wherein the rotor lamination is rotatably disposed inside the stator lamination.

[0014] Optionally, the number of stator slots of the stator lamination is Q, the number of pole pairs of the rotor is P, the number of phases of the motor is m, and the relationship between Q, P and m is: Q / 2mp < 1.

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

[0016] The present invention also proposes a refrigeration device, including the compressor described above.

[0017] The aforementioned stator laminations offer at least the following beneficial effects:

[0018] The technical solution of this invention employs an annular stator yoke and multiple stator teeth spaced circumferentially along the annular stator yoke to form stator slots between any two adjacent stator teeth. The stator yoke has multiple grooves along its circumferential direction on its side facing away from the stator teeth. The cross-sectional area of ​​each groove is S, the maximum width of the stator yoke is h, the outer diameter of each stator lamination is D1, and the inner diameter of each stator lamination is D2. The relationship between S, h, D1, and D2 is: 0.07 ≤ 2S / [h(D1-D2)] ≤ 0.5. Through reasonable design, when 2S / [h(D1-D2)] is within the range of 0.07 to 0.5, this solution can improve the current flow ratio of the stator core, thereby improving the energy efficiency of motors and compressors using this stator core and optimizing the oil discharge of the compressor. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the first structure of the stator lamination of the present invention;

[0021] Figure 2 This is a schematic diagram of the second structure of the stator lamination;

[0022] Figure 3 A comparison chart of the energy efficiency of a compressor using the stator laminations of this invention and a conventional compressor;

[0023] Figure 4 This is a comparison chart showing the oil output of a compressor using the stator laminations of this invention and a conventional compressor.

[0024] Explanation of icon numbers:

[0025] label name label name 100 stator yoke 300 stator slot 200 stator teeth 400 groove

[0026] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0031] This invention proposes a stator lamination.

[0032] Reference Figures 1 to 4 In one embodiment of the present invention, the stator lamination includes an annular stator yoke 100 and a plurality of stator teeth 200 spaced circumferentially along the annular stator yoke 100 to form a stator groove 300 between any two adjacent stator teeth 200. The side of the stator yoke 100 away from the stator teeth 200 is provided with a plurality of grooves 400 along the circumferential direction. The cross-sectional area of ​​the grooves 400 is S, the maximum width of the stator yoke 100 is h, the outer diameter of the stator lamination is D1, and the inner diameter of the stator lamination is D2. The relationship between S, h, D1 and D2 is: 0.07≤2S / [h(D1-D2)]≤0.5.

[0033] The values ​​of 2S / [h(D1-D2)] are shown in Table 1 for different values ​​of the four parameters S, h, D1, and D2.

[0034]

[0035] Table 2 compares the compressor energy efficiency and oil output results for different values ​​of 2S / [h(D1-D2)]:

[0036]

[0037] As shown in Tables 1 and 2, compared to the other four schemes, Scheme 1 has the smallest groove 400 area, the largest oil discharge volume, and the weakest oil return capacity. However, the energy efficiency of the compressor using the stator lamination motor is generally average, ranking fourth in energy efficiency among the five schemes. Scheme 2 has the largest groove 400 area, the smallest oil discharge volume, and the best oil return capacity compared to the other four schemes. However, the energy efficiency of the compression chamber using the stator lamination is the lowest, ranking fifth in energy efficiency among the five schemes. Scheme 3 uses a wider stator yoke 100 width and a larger groove 400 area. Therefore, the compressor using the stator core has a relatively good level of energy efficiency and oil return capacity, ranking third in energy efficiency among the five schemes. Schemes 4 and 5, based on Scheme 3, reduce the area of ​​the groove by 400, increase the outer diameter of the stator, and further reduce the width of the stator yoke 100. The energy efficiency and oil discharge of the compressor using this stator lamination are improved. In summary, this scheme, through reasonable design, improves the current flow ratio of the stator core when the value of 2S / [h(D1-D2)] is in the range of 0.07 to 0.5, thereby improving the energy efficiency of the motor using this stator core and the compressor using this motor, and optimizing the oil discharge of the compressor.

[0038] It should be noted that the width of the stator yoke 100 is the dimension of the stator yoke 100 in the radial direction of the stator lamination.

[0039] Furthermore, the relationship between S, h, D1, and D2 is: 0.07≤2S / [h(D1-D2)]≤0.23; this limits the range of values ​​for S, h, D1, and D2, which can improve the current flow ratio of the stator core, thereby improving the energy efficiency of the motor using this stator core and the compressor using this motor, and optimizing the oil discharge of the compressor.

[0040] Furthermore, the relationship between S, h, D1, and D2 is: 0.15≤2S / [h(D1-D2)]≤0.18; this limits the range of values ​​for S, h, D1, and D2, which can further improve the current flow ratio of the stator core, thereby improving the energy efficiency of the motor using this stator core and the compressor using this motor, and optimizing the oil discharge of the compressor.

[0041] Furthermore, each stator tooth 200 includes a first tooth shoe portion and a second tooth shoe portion, wherein both the first tooth shoe portion and the second tooth shoe portion extend circumferentially along the annular stator yoke 100, the first tooth shoe portion is located on a first side of the center line of the stator tooth 200, and the second tooth shoe portion is located on a second side of the center line.

[0042] Furthermore, the first tooth shoe of one stator tooth 200 and the second tooth shoe of the other stator tooth 200 do not contact each other. That is, the stator slot 300 formed between two adjacent stator teeth 200 has an opening that also faces the rotor opening; this opening represents the gap between the adjacent first and second tooth shoes. If the opening of the stator slot 300 is too small, it may cause difficulties during winding. Simultaneously, all four corners of the stator slot 300 are rounded. This design ensures the mechanical strength of the end connecting the stator tooth 200 and the stator yoke 100, while also improving the utilization rate of the stator slot area.

[0043] Furthermore, the first and second toothed parts are symmetrically arranged about the center line of the stator teeth 200, which facilitates processing. The purpose of adopting a symmetrical structure for the stator teeth 200 is twofold: (1) to meet the requirement of bidirectional rotation of the motor; and (2) to avoid introducing excessive magnetic field harmonics. Of course, it is not limited to a symmetrical arrangement.

[0044] Furthermore, the tooth tip of the stator tooth 200 includes an inwardly curved arc portion, that is, the end of the stator tooth 200 away from the stator yoke 100 includes an inwardly curved arc portion. In this scheme, "inward" refers to the direction toward the center of the stator lamination.

[0045] Preferably, the radii of the arc portions of the multiple stator teeth 200 are equal and concentric with the center of the stator lamination. Thus, during stator injection molding, the outer diameter of the inner mold can be set to match the radius of the arc portion, allowing the inner mold to be positioned at the arc portion for injection molding.

[0046] Furthermore, the bottom of the stator slot 300 is arranged in an arc shape, and the arc coincides with the inner circumference of the stator yoke 100. This arrangement is beneficial to the magnetic force distribution during motor operation.

[0047] Furthermore, in this embodiment, the stator laminations are a one-piece structure. This one-piece structure simplifies the manufacturing process, reduces the difficulty of manufacturing the stator core, and thus lowers the production cost of the motor. Additionally, making the stator laminations a one-piece structure improves the mechanical properties of the stator core, thereby enhancing the stability of the motor during operation and extending its service life.

[0048] Furthermore, the stator core is composed of multiple stator laminations stacked axially, with the stator laminations of the stator core having the same thickness and using the same magnetic material.

[0049] The stator laminations are made of soft magnetic materials. Soft magnetic materials can achieve a large magnetization intensity with a small external magnetic field. Soft magnetic materials have low coercivity and high permeability, which is beneficial to reducing the loss of the stator core, that is, reducing the iron loss of the motor, and thus improving the performance of the motor.

[0050] Furthermore, in one embodiment, the stator laminations are made of silicon steel sheets with a thickness of less than 0.35 mm. Silicon steel sheets have low iron loss, a high stacking factor, good magnetic induction intensity, and good stamping properties, thus ensuring good working performance of the stator laminations. Silicon steel sheets can reduce eddy current losses and hysteresis losses, thereby reducing core heating. Moreover, the insulation between multiple silicon steel sheets reduces the current-carrying area, further reducing heat generation. Of course, the invention is not limited to this; in other embodiments, the stator laminations are made of neodymium iron boron, ferrite, or other permanent magnet materials.

[0051] Furthermore, a silicon steel plate thickness of 0.35mm is selected. On the one hand, this ensures that the rotor and stator cooperate to generate sufficient induced current for user use; on the other hand, it avoids the occurrence of large eddy current damage caused by excessively thick stator laminations, thereby extending the service life of the motor. Moreover, by limiting the thickness of the silicon steel plate, unnecessary material usage is avoided while meeting functional requirements, reducing production costs, lightening product weight, and improving the user experience.

[0052] Furthermore, in one embodiment, the stator teeth 200 are made of oriented electrical steel, while the stator yoke 100 is made of non-oriented electrical steel. Since non-oriented electrical steel is cheaper and oriented electrical steel has lower iron loss and better magnetic induction, this avoids the need to replace all stator laminations with oriented electrical steel when replacing them; only the stator teeth 200 need to be replaced with oriented electrical steel, which helps reduce costs. On the other hand, the excellent magnetic directionality of oriented electrical steel helps to improve the permeability of the stator core teeth and reduce iron loss, thereby improving motor efficiency.

[0053] Optionally, the cross-sectional area S1 of the groove 400 is in the range of 20 mm. 2 ≤S1≤25mm 2 Referring to Tables 1 and 2, the cross-sectional area S1 of the limiting groove 400 is 20 mm². 2 Up to 25mm 2 This is beneficial for further optimizing compressor energy efficiency and compressor oil output.

[0054] Furthermore, the groove 400 includes a first groove segment and a second groove segment. The first groove segment serves as a groove-shaped base and is formed by the inward indentation of the outer side wall of the stator yoke 100, that is, the side wall away from the axis of the stator core. The second groove segment is formed by the inward indentation of the first groove segment, that is, the second groove segment extends from the bottom of the first groove segment toward the axis of the stator core, thereby forming a configuration of two layers of grooves 400 superimposed. This can suppress noise on the one hand and ensure motor efficiency on the other.

[0055] Furthermore, since the second groove segment is formed by extending inward from the first groove segment, the groove width of the second groove segment is generally not greater than the groove width of the first groove segment.

[0056] Optionally, in one embodiment, the connecting line between two adjacent grooves 400 is a straight line. In a second embodiment, the connecting line between two adjacent grooves 400 is a curved line. Using a conventional structure facilitates manufacturing. Of course, the invention is not limited to this; in other embodiments, on the same stator lamination, the connecting lines between some adjacent grooves 400 may be straight lines, and the connecting lines between some adjacent grooves 400 may be curved lines.

[0057] Optionally, the maximum width h of the stator yoke 100 is within the range of 5mm ≤ h ≤ 6mm. On the one hand, limiting the width of the stator yoke 100 to a certain range can reduce the thickness of the stator yoke 100, increase the slot area, reduce motor losses, improve motor efficiency, and improve the energy efficiency of the compressor using this motor. While maintaining high motor efficiency, it also ensures the rigidity of the motor stator, reduces motor vibration noise, and consequently reduces the overall noise of the compressor. This not only ensures the rigidity of the stator laminations but also improves the energy efficiency of the compressor using the motor with this stator core and optimizes the compressor's oil discharge. On the other hand, limiting the width of the stator yoke 100 further limits the length of the stator slot 300 in the radial direction of the stator core, that is, limits the slot depth of the stator slot 300. By limiting the above dimensions, the slot area of ​​the stator slot 300 is also limited, further constraining the magnetic flux level of the entire motor. By limiting the dimensions of each part of the stator core and the area of ​​the stator slot 300, the magnetic flux level and copper-iron loss level of the entire motor are constrained, and the copper-iron loss level can be distributed within a reasonable range, thereby improving the overall efficiency of the motor.

[0058] Optionally, the outer diameter D1 of the stator lamination is in the range of 85mm≤D1≤110mm; that is, the size of the stator lamination is limited, which indirectly limits the size of the rotor core, thereby initially limiting the magnetic flux of the motor; moreover, limiting the range of the outer diameter D1 of the stator lamination also limits the outer diameter of the motor, preventing the motor from being too large, and ensuring that the motor within this size range has high energy efficiency.

[0059] Optionally, the inner diameter D2 of the stator lamination is in the range of 45mm≤D2≤60mm. The stator lamination has a larger inner diameter and a smaller ring width, and the magnetic field density of the yoke and the teeth is closer, resulting in a more uniform magnetic field density of the stator when the motor is running.

[0060] Furthermore, in one embodiment, when the outer diameter of the stator lamination remains unchanged while the inner diameter of the hole increases, the area of ​​the slot is reduced, thereby reducing the amount of silicon steel sheet used and increasing the utilization rate of the silicon steel sheet.

[0061] Optionally, the number of stator slots 300 is Q, where Q ≥ 15. Specifically, the stator slots 300 are formed between two stator teeth 200. The number of stator slots 300 is positively correlated with the number of stator teeth 200. In this design, the motor demagnetization capability is different when the number of stator teeth 200 is different. Therefore, according to the motor demagnetization characteristics, the more teeth there are, the stronger the motor demagnetization capability. Thus, the number of stator slots 300 is limited to Q ≥ 15, thereby indirectly limiting the number of stator teeth 200, which is beneficial to enhancing the demagnetization capability.

[0062] The present invention also proposes an electric motor, which includes a rotor lamination and the aforementioned stator lamination, wherein the rotor lamination is rotatably disposed inside the stator lamination. The specific structure of the stator lamination is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0063] It should be noted that the rotor core is made by stacking and stamping multiple rotor laminations.

[0064] The rotor laminations can be made of soft magnetic materials. Soft magnetic materials can achieve a large magnetization intensity with a small external magnetic field. Soft magnetic materials have low coercivity and high permeability, which is beneficial to reducing the loss of the rotor core, that is, reducing the iron loss of the motor, and thus improving the performance of the motor.

[0065] Furthermore, in this embodiment, the rotor core is made of silicon steel sheets. Silicon steel sheets can reduce eddy current losses and hysteresis losses, thereby reducing rotor core heating. Moreover, the multiple silicon steel sheets are insulated from each other, reducing the current-carrying area and further reducing heat generation. Specifically, during stamping, multiple magnetic slots on each rotor lamination can be connected along the axial direction of the rotor core, allowing the multiple magnetic slots on each rotor lamination to correspondingly form slots. Multiple magnetic conductors are adapted to the formation of these slots, and the multiple magnetic conductors are inserted into the multiple slots to form magnetic poles. It is understood that the rotor laminations can also be made of neodymium iron boron, ferrite, or other materials.

[0066] Furthermore, in one embodiment, the rotor laminations and stator laminations can be made of different materials or have different shapes, thereby meeting the requirements of different processing techniques for the stator and rotor. This facilitates the selection of appropriate laminations to form the rotor core and stator core according to the performance requirements of the motor, thus ensuring good electrode performance and expanding the applicability of the motor. Of course, the invention is not limited to this. In other embodiments, the stator laminations stacked to form the stator core and the rotor laminations stacked to form the rotor core are made of the same material, which is beneficial for mass production of laminations and reduces manufacturing costs.

[0067] Furthermore, the rotor core is formed by axially stacking multiple rotor laminations, and the material of the rotor laminations is selected as silicon steel sheets or other soft magnetic materials, with a thickness of no more than 0.35mm.

[0068] Optionally, the number of stator slots 300 of the stator lamination is Q, the number of pole pairs of the rotor is P, and the number of phases of the motor is m. The relationship between Q, P and m is: Q / 2mp < 1.

[0069] Specifically, by limiting the number of stator teeth 200 to no more than twice the product of the number of pole pairs of the rotor and the number of phases of the motor, a fractional-slot motor can be formed. Under the action of the fractional-slot motor, the high-order harmonic potentials generated by the non-sinusoidal distribution of the magnetic field of the poles can be effectively weakened, and the amplitude of the tooth harmonic potential can also be reduced, improving the waveform. Furthermore, due to the fractional-slot configuration, the amplitude of magnetic flux pulsation can be effectively reduced, thereby reducing pulsation losses on the pole surface.

[0070] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since the compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0071] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor is as described in the above embodiments. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0072] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A stator lamination, characterized in that, The stator lamination is an integral structure, comprising an annular stator yoke and multiple stator teeth spaced circumferentially along the annular stator yoke to form stator slots between any two adjacent stator teeth. The stator yoke has multiple grooves along the circumferential direction on the side facing away from the stator teeth, the cross-sectional area of ​​the grooves is S, the maximum width of the stator yoke is h, the outer diameter of the stator lamination is D1, and the inner diameter of the stator lamination is D2. The relationship between S, h, D1, and D2 is: 0.07≤2S / [h(D1-D2)]≤0.

5.

2. The stator lamination as described in claim 1, characterized in that, The relationship between S1, h, D1 and D2 is: 0.07≤2S / [h(D1-D2)]≤0.

23.

3. The stator lamination as described in claim 2, characterized in that, The relationship between S1, h, D1 and D2 is: 0.15≤2S / [h(D1-D2)]≤0.

18.

4. The stator lamination as described in claim 1, characterized in that, The cross-sectional area S of the groove is in the range of 20mm. 2 ≤S≤25mm 2 .

5. The stator lamination as described in claim 1, characterized in that, The connecting line between two adjacent grooves is set as a straight line and / or a curve.

6. The stator lamination as described in claim 1, characterized in that, The maximum width h of the stator yoke is in the range of 5mm ≤ h ≤ 6mm.

7. The stator lamination as described in claim 1, characterized in that, The outer diameter D1 of the stator lamination is in the range of 85mm≤D1≤110mm.

8. The stator lamination as described in claim 1, characterized in that, The inner diameter D2 of the stator lamination is in the range of 45mm≤D2≤60mm.

9. The stator lamination as described in any one of claims 1 to 8, characterized in that, The number of stator slots is Q, where Q ≥ 15.

10. An electric motor, characterized in that, The motor includes rotor laminations and stator laminations as described in any one of claims 1 to 9, wherein the rotor laminations are rotatably disposed inside the stator laminations.

11. The motor as described in claim 10, characterized in that, The number of stator slots in the stator lamination is Q, the number of pole pairs in the rotor is P, and the number of phases in the motor is m. The relationship between Q, P, and m is: Q / 2mp < 1.

12. A compressor, characterized in that, Including the motor as described in claim 10 or 11.

13. A refrigeration device, characterized in that, Includes the compressor as described in claim 12.

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