Stator lamination, stator iron core, motor and compressor

Abstract

The present application discloses a stator lamination, a stator iron core, a motor and a compressor. The stator lamination comprises a yoke portion and Q tooth portions; the yoke portion is annular; the Q tooth portions are arranged at intervals in the circumferential direction of the inner ring surface of the yoke portion, so as to form a stator slot on the inner ring surface of the yoke portion and between every two spaced tooth portions; the stator slot comprises a tooth slot wall located on the tooth portions and a yoke slot wall located on the inner ring surface; the maximum thickness from the yoke slot wall to the outer ring surface of the yoke portion is L1, the width of each tooth portion is H1, and the relationship among Q, L1, and H1 is 0.08≤L1 / (H1*Q)≤0.11.

Description

Stator laminations, stator cores, motors and compressors

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 29, 2024 with application number 202410230374.6 and the Chinese patent application filed with the China Patent Office on February 29, 2024 with application number 202420394215.5, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of motors, and in particular to a stator punching sheet, a stator core, a motor and a compressor. Background Art

[0003] The motor stator is composed of a stack of monolithic stator laminations. Windings are wound onto the generator stator. Generators of different frame sizes use stator laminations of varying sizes. Stator laminations are key components of single-phase generators. Parameters such as yoke size, slot shape, and tooth width significantly influence not only the stator's stiffness but also the motor's efficiency. Technical issues

[0004] The main purpose of this application is to provide a stator punching sheet, which aims to improve the stator stiffness and the efficiency of the motor. Technical Solutions

[0005] To achieve the above-mentioned purpose, the stator punching sheet proposed in this application includes:

[0006] a yoke, the yoke being annular; and

[0007] Q teeth, each of which is spaced apart along the circumferential direction of the inner annular surface of the yoke, so as to form a stator slot between the inner annular surface of the yoke and two spaced-apart teeth;

[0008] The stator slot includes a tooth slot wall located at the tooth portion and a yoke slot wall located at the inner annular surface. The maximum thickness from the yoke slot wall to the outer annular surface of the yoke portion is L1. The width of the tooth portion is H1. The relationship among Q, L1 and H1 is 0.08≤L1 / (H1*Q)≤0.11.

[0009] Exemplarily, the distance D1 from the center of the stator punching sheet to the midpoint of the yoke slot wall (320) is D2, and the distance D2 from the center of the stator punching sheet to at least one point of the yoke slot wall (320) other than D1 satisfies D2<D1.

[0010] Exemplarily, the included angle between the yoke slot wall and the tooth slot wall is A, and the range of A is: 80°≤A≤100°.

[0011] Exemplarily, when the number of teeth Q=9, the relationship among Q, L1 and H1 is: 0.085≤L1 / (H1*Q)≤0.095.

[0012] Exemplarily, when the number of teeth Q=12, the relationship among Q, L1 and H1 is: 0.085≤L1 / (H1*Q)≤0.11.

[0013] Exemplarily, when the number of teeth Q=15, the relationship among Q, L1 and H1 is: 0.08≤L1 / (H1*Q)≤0.095.

[0014] Exemplarily, a position of maximum thickness from the yoke slot wall to the outer annular surface of the yoke portion is arranged close to the tooth portion.

[0015] Exemplarily, the distance between the midpoint of the yoke slot wall and the outer annular surface of the yoke portion is L2, and the relationship among L2, Q and H1 is: 0.07≤L2 / (H1*Q)≤0.1.

[0016] Exemplarily, the outer annular surface of the yoke is provided with a cutting edge, the minimum distance from the yoke slot wall to the cutting edge is L3, and the relationship among L3, Q and H1 is: 0.06≤L3 / (H1*Q)≤0.09.

[0017] Exemplarily, the outer annular surface of the yoke is provided with a groove, the minimum distance between the intersection of the yoke groove wall and the tooth groove wall and the groove wall of the groove is L4, and the relationship between L4, Q and H1 is: 0.05≤L4 / (H1*Q)≤0.07.

[0018] The present application also proposes a stator core, comprising a plurality of the above-mentioned stator punching sheets, wherein the plurality of the stator punching sheets are stacked.

[0019] Exemplarily, the stator core includes two end punches located at the ends of the stator core, and several middle punches arranged between the two end punches, the maximum distance from the yoke slot wall of the end punch to the outer annular surface of the yoke part is L11, the maximum distance from the yoke slot wall of the middle punch to the outer annular surface of the yoke part is L12, and L11 of at least one of the end punches is less than L12.

[0020] Exemplarily, the tooth width of the end punching sheet is H11, the tooth width of the middle punching sheet is H12, and H11 of at least one of the end punching sheets is less than H12.

[0021] The present application also provides a motor, comprising the above-mentioned stator core.

[0022] The present application also provides a compressor comprising the above-mentioned motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] FIG1 is a schematic structural diagram of a first embodiment of a stator punching sheet of the present application;

[0025] FIG2 is a partial enlarged view of point A in FIG1 ;

[0026] FIG3 is a schematic structural diagram of a second embodiment of a stator punching sheet of the present application;

[0027] FIG4 is a schematic structural diagram of a third embodiment of a stator punching sheet of the present application;

[0028] FIG5 is a schematic structural diagram of a fourth embodiment of a stator punching sheet of the present application;

[0029] FIG6 is a schematic structural diagram of an embodiment of a stator core of the present application;

[0030] FIG7 is a schematic cross-sectional view of the stator core of FIG6 ;

[0031] FIG8 is a schematic cross-sectional view of the motor;

[0032] FIG9 is a schematic diagram showing how the stiffness and motor efficiency of the present application vary with the angle L1 / (H1*Q);

[0033] FIG10 is a schematic diagram showing a noise comparison between the compressor of the present application and the prior art.

[0034] Description of Figure Numbers:

[0035] Reference number name Reference number name 100 yoke 310 tooth groove wall 110 cutting edge 320 yoke groove wall 120 groove 400 end punching sheet 200 tooth 500 middle punching sheet 300 stator slot

[0036] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0037] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] All directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0041] The present application provides a stator punching sheet.

[0042] 1 , 2 and 9 , in one embodiment of the present application, the stator sheet includes a yoke 100 and Q teeth 200 , the yoke 100 is annular; the Q teeth 200 are arranged at circumferential intervals along the inner annular surface of the yoke 100 to form a stator slot 300 between the inner annular surface of the yoke 100 and the two-phase spaced teeth 200; the stator slot 300 includes a tooth slot wall 310 located on the tooth 200 and a yoke slot wall 320 located on the inner annular surface, the maximum thickness from the yoke slot wall 320 to the outer annular surface of the yoke 100 is L1, the width of the tooth 200 is H1, and the relationship among Q, L1 and H1 is 0.08≤L1 / (H1*Q)≤0.11.

[0043] The width of the tooth portion 200 not only affects the stiffness of the stator, but also affects the efficiency of the motor. The larger the width of the tooth portion 200, the stronger the magnetic field generated, and the greater the torque that can be generated. However, in practice, the width of the tooth portion 200 cannot be too large, otherwise the magnetic flux path between the teeth 200 will be incomplete, which will reduce the efficiency of the motor. If the width of the tooth portion 200 is too small, it will cause oscillation of the alternating magnetic field and generate noise. Therefore, it is necessary to control the range of the width of the tooth portion 200 so that it remains stable within a reasonable range. The width of the tooth portion 200 will also affect the temperature rise and loss of the motor. If the width of the tooth portion 200 is too small, the local current density will be too high, causing heat generation and reduced motor efficiency. Conversely, if the width of the tooth portion 200 is too large, the magnetic flux distribution will be unreasonable, which will also affect the efficiency of the motor. Secondly, the width of the outer annular surface from the yoke slot wall 320 to the yoke 100 not only affects the stiffness, but also increases the stiffness of the stator as the width of the outer annular surface from the yoke slot wall 320 to the yoke 100 increases. The width of the outer annular surface from the yoke slot wall 320 to the yoke 100 also affects the area of ​​the stator slot 300. If the area of ​​the stator slot 300 decreases, the efficiency of the motor will decrease. Furthermore, in general, increasing the number of teeth 200 can improve the efficiency and output power of the motor. However, when the number of teeth 200 is too large, it will lead to saturation of the motor, thereby reducing the output power of the motor. Therefore, the maximum thickness L1 of the outer annular surface from the yoke slot wall 320 to the yoke 100, the width H1 of the teeth 200, and the number of teeth 200 have a significant impact on the stiffness of the stator and the efficiency of the motor.

[0044] Figure 9 shows how stator stiffness and motor efficiency vary with the angle L1 / (H1*Q). This solution uses parametric design sweeps of L1, Q, and H1, and global parametric design and simulation experiments for L1 / (H1*Q), yielding the diagram shown in Figure 9 showing how stator stiffness and motor efficiency vary with the angle L1 / (H1*Q).

[0045] 9 , it can be seen that when L1 / (H1*Q) is less than 0.085, the stator stiffness is positively correlated with L1 / (H1*Q). As L1 / (H1*Q) increases, the stator stiffness gradually increases. When L1 / (H1*Q) is greater than 0.085, the stator stiffness is also positively correlated with L1 / (H1*Q), but as L1 / (H1*Q) increases, the increase in stator stiffness gradually tends to be flat. When L1 / (H1*Q) is less than 0.11, the motor efficiency is negatively correlated with L1 / (H1*Q). As L1 / (H1*Q) increases, the motor efficiency gradually decreases, but the decrease in motor efficiency is relatively slow. When L1 / (H1*Q) is greater than 0.11, the motor efficiency is also negatively correlated with L1 / (H1*Q), but as L1 / (H1*Q) increases, the motor efficiency decreases sharply. It can be seen that when the range of L1 / (H1*Q) is limited to between 0.08 and 0.11, the stator stiffness and motor efficiency can be relatively optimized.

[0046] Secondly, the distance D1 from the center of the stator punching sheet to the midpoint of the yoke slot wall 320, and the distance D2 from the center of the stator punching sheet to at least one point other than D1 on the yoke slot wall 320, satisfying D2<D1; that is, there is at least one point on the yoke slot wall 320 close to the tooth portion 200 whose distance to the center of the stator punching sheet is less than the distance from the center of the stator punching sheet to the midpoint of the yoke inner wall. In the prior art, the yoke inner wall of the stator slot 300 is generally designed to be a circular arc shape, and the distance from the circular arc to the center of the stator punching sheet is equal, resulting in an unreasonable distribution of stator structural strength, low stator modal stiffness, and thus poor noise. This solution sets the distance from at least one point on the yoke slot wall 320 close to the tooth portion 200 to the center of the stator punching sheet to be less than the distance from the center of the stator punching sheet to the midpoint of the yoke inner wall. This can increase the stator structural strength while making the stator structural strength uniformly distributed, the stator modal stiffness excellent, and thus achieving low noise.

[0047] Figure 10 is a schematic diagram comparing the noise of the compressor of this solution and the prior art. Referring to Figure 10, it can be seen that the stator punchings proposed in this solution are applied to the compressor, which can effectively reduce the noise of the compressor. Therefore, the technical solution of this application can improve the stator stiffness, greatly optimize the noise of the motor and compressor, and improve the efficiency of the motor and compressor.

[0048] A transition chamfer is provided between the tooth groove wall 310 and the yoke groove wall 320 , and neither the tooth groove wall 310 nor the yoke groove wall 320 includes the transition chamfer.

[0049] For example, when the number of teeth 200 is Q=9, the relationship among Q, L1 and H1 is: 0.085≤L1 / (H1*Q)≤0.095; when the number of teeth 200 is 9, through parametric design and experiments on L1 / (H1*Q), the stator stiffness increases with the increase of L1 / (H1*Q); when L1 / (H1*Q) is below 0.085, the stator stiffness increases significantly with the increase of L1 / (H1*Q); when L1 / (H1*Q) is above 0.085, the increase of stator stiffness tends to be stable. On the other hand, the motor efficiency of the motor decreases with the increase of L1 / (H1*Q). When L1 / (H1*Q) is below 0.095, the motor efficiency decreases relatively slowly with the increase of L1 / (H1*Q); when L1 / (H1*Q) is above 0.095, the motor efficiency decreases significantly with the increase of L1 / (H1*Q); therefore, when the number of teeth 200 is 9, L1 / (H1*Q) is limited to between 0.085 and 0.095, and both the stator stiffness and the motor efficiency can be relatively excellent.

[0050] For example, when the number of teeth 200 Q=12, the relationship among Q, L1 and H1 is: 0.085≤L1 / (H1*Q)≤0.11; when the number of stator slots 300 Q=12, through parametric design and experiments on L1 / (H1*Q), the stator stiffness increases with the increase of L1 / (H1*Q); when L1 / (H1*Q) is below 0.085, the stator stiffness increases significantly with the increase of L1 / (H1*Q); when L1 / (H1*Q) is above 0.085, the increase of stator stiffness tends to be stable. On the other hand, the motor efficiency decreases with the increase of L1 / (H1*Q). When L1 / (H1*Q) is below 0.11, the motor efficiency decreases relatively slowly with the increase of L1 / (H1*Q). When L1 / (H1*Q) is above 0.11, the motor efficiency decreases significantly with the increase of L1 / (H1*Q). It can be seen that by limiting the range of L1 / (H1*Q) to between 0.085 and 0.11, both the stator stiffness and the motor efficiency can be relatively optimized.

[0051] In the first embodiment, the number of stator slots Q = 12, the diameter of the outer annular surface of the stator lamination is 101 mm, the distance from the center of the stator lamination to the midpoint of the yoke slot wall 320 of the stator slot is D1, for example, set to 43 mm, and the distance from any point on the yoke slot wall 320 other than D1 to the center of the stator lamination is D2. There is a minimum dimension D2min. For example, at the yoke slot wall 320 near the stator tooth (excluding the chamfer between the yoke slot wall 320 and the tooth slot wall 310), D2min is set to 42 mm, where D1>D2min. Furthermore, the maximum physical thickness of the yoke slot wall 320 of the stator slot 300 to the outer annular surface of the yoke 100 is set to L1, for example, set to 8 mm. Similarly, L1 does not include the chamfer between the yoke slot wall 320 and the tooth slot wall 310. When Q = 12, H1 is designed to be 6.5 mm, for example. L1 / (H1*Q)=8 / (6.5*12)=0.103. The same applies to other embodiments.

[0052] For example, when the number of teeth 200 Q=15, the relationship among Q, L1 and H1 is: 0.08≤L1 / (H1*Q)≤0.095; when the number of teeth 200 is 15, through parametric design and experiments on L1 / (H1*Q), the stator stiffness increases with the increase of L1 / (H1*Q); when L1 / (H1*Q) is below 0.08, the stator stiffness increases significantly with the increase of L1 / (H1*Q); when L1 / (H1*Q) is above 0.08, the increase of stator stiffness tends to be stable. On the other hand, the motor efficiency decreases with the increase of L1 / (H1*Q). When L1 / (H1*Q) is below 0.095, the motor efficiency decreases relatively slowly with the increase of L1 / (H1*Q); when L1 / (H1*Q) is above 0.095, the motor efficiency decreases significantly with the increase of L1 / (H1*Q). It can be seen that by limiting the range of L1 / (H1*Q) to between 0.08 and 0.095, both the stator stiffness and the motor efficiency can be relatively optimized.

[0053] Furthermore, the maximum thickness position of the yoke slot wall 320 to the outer annular surface of the yoke portion 100 is arranged close to the tooth portion 200 , which is beneficial for ensuring the rigidity of the stator while improving the slot fill rate of the stator slot 300 .

[0054] For example, the distance between the midpoint of the yoke slot wall 320 and the outer annular surface of the yoke 100 is L2, and the relationship between L2, Q, and H1 is: 0.07≤L2 / (H1*Q)≤0.1. Considering that the position of the cutting edge 110 affects the distance from the yoke slot wall 320 to the outer annular surface of the yoke 100, that is, affects the width of the yoke 100, and the midpoint of the yoke slot wall 320 is generally the position of the yoke slot wall 320 closest to the outer annular surface of the yoke 100, because the distance from the yoke slot wall 320 to the outer annular surface of the yoke 100, the width of the teeth 200, and the number of teeth 200 have an inseparable influence on the stiffness of the stator and the efficiency of the motor, through global parametric design and simulation experiments on L2 / (H1*Q), it is found that limiting L2 / (H1*Q) to between 0.07 and 0.1 is beneficial to improving the stiffness of the stator, significantly optimizing the noise of the motor and compressor, and improving the efficiency of the motor and compressor.

[0055] 3 and 4 , exemplarily, the outer annular surface of the yoke 100 is provided with a cutting edge 110, and the minimum distance from the yoke slot wall 320 to the cutting edge 110 is L3, and the relationship among L3, Q and H1 is: 0.06≤L3 / (H1*Q)≤0.09; since part of the cutting edge 110 will be opposite to the yoke slot wall 320 of the stator slot 300, or the end of the cutting edge 110 will be opposite to the yoke slot wall 320 of the stator slot 300, the minimum distance from the yoke slot wall 320 to the cutting edge 110 will be the entire yoke 10 0 is the position with the smallest width, and since the distance from the yoke slot wall 320 to the outer annular surface of the yoke 100, the width of the tooth portion 200, and the number of the tooth portions 200 have an inseparable influence on the stiffness of the stator and the efficiency of the motor, through global parametric design and simulation experiments on L3 / (H1*Q), it is concluded that limiting L3 / (H1*Q) to between 0.06 and 0.09 is beneficial to improving the stator stiffness, greatly optimizing the noise of the motor and compressor, and improving the efficiency of the motor and compressor.

[0056] 5 , in order to further improve the oil return of the compressor, radially inward grooves 120 are further provided on the outer wall of the stator.

[0057] The outer annular surface of the yoke 100 is provided with a groove 120. The minimum distance between the intersection of the yoke groove wall 320 and the tooth groove wall 310 and the groove wall of the groove 120 is L4. The relationship between L4, Q, and H1 is: 0.05≤L4 / (H1*Q)≤0.07. Considering that the position of the groove 120 affects the distance from the yoke groove wall 320 to the outer annular surface of the yoke 100, and thus the width of the yoke 100, the distance from the yoke groove wall 320 to the outer annular surface of the yoke 100, the width of the teeth 200, and the number of teeth 200 have an inseparable influence on the stator stiffness and motor efficiency. Through global parametric design and simulation experiments on L4 / (H1*Q), it was found that limiting L4 / (H1*Q) to between 0.05 and 0.07 is beneficial for improving stator stiffness, significantly optimizing the noise of the motor and compressor, and improving the efficiency of the motor and compressor.

[0058] It should be noted that L4 refers to the minimum distance from the yoke slot wall 320 of the stator slot 300 or the transition chamfer between the yoke slot wall 320 and the tooth slot wall 310 of the stator slot 300 to the groove 120 .

[0059] For example, when the outer annular surface of the yoke 100 corresponding to the midpoint of the yoke slot wall 320 of the stator slot 300 is a cut edge 110 or a groove 120 , L2 is defined as the physical dimension of the position in the radial direction, thereby ensuring the stator stiffness.

[0060] Furthermore, starting from a certain starting point of the yoke slot wall 310 of the stator slot 300 , the distance from a point on the yoke slot wall 310 to the center of the stator punching gradually decreases toward the tooth portion 200 , thereby achieving a uniform distribution of modes and stiffness.

[0061] 5 , illustratively, the angle A between the yoke slot wall 320 and the tooth slot wall 310 is 80°≤A≤100°. Through parametric design and experiments on the slot fill rate at different angles A, it was found that when angle A is below 80°, A is positively correlated with the slot fill rate, that is, as the angle gradually increases, the slot fill rate also gradually increases, but the slot fill rate is low. When angle A is between 80° and 100°, as the angle gradually increases, the slot fill rate also gradually increases, and the slot fill rate is relatively high. When angle A is between 80° and 100°, the slot fill rate reaches its maximum. When angle A is above 100°, A is negatively correlated with the slot fill rate, and as the angle gradually increases, the slot fill rate gradually decreases, but between 80° and 100°, the slot fill rate is relatively high. It can be seen that the range of A is between 80° and 100°, which can make the stator slot fill rate better, thereby improving the efficiency and power factor of the motor, reducing energy consumption, and increasing the output torque and power density of the motor, thereby improving the energy efficiency of the compressor.

[0062] 2 , illustratively, the inner wall of the stator slot 300 is shaped as at least two straight or curved segments, and the angle A between the tangent of the straight or curved segment near the tooth portion 200 and the tooth portion 200 is limited to 80°≤A≤100°. The yoke slot wall 310 near the tooth portion 200 is shaped as a straight or curved segment, and the tangent of the straight or curved segment plus the angle A between the yoke slot wall 310 and the tooth slot wall 310 is limited to between 80° and 100°. This facilitates the tangent of the yoke slot wall 310 to form a near right angle with the tooth slot wall 310 of the stator slot 300, which is beneficial for winding arrangement. This application has been verified through a large number of experiments, and this embodiment can achieve a 5% increase in the winding slot fill rate, thereby improving the energy efficiency of the permanent magnet motor and compressor.

[0063] 6 and 7 , the present application further proposes a stator core comprising a plurality of stator punchings. The specific structure of the stator punchings is similar to that of the above-described embodiments. Since the present stator core employs all the technical solutions of all the above-described embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above-described embodiments, which will not be described in detail here. The plurality of stator punchings are stacked.

[0064] For example, the stator core includes two end punchings 400 located at the ends of the stator core and a plurality of middle punchings 500 disposed between the two end punchings 400. The maximum distance between the yoke slot wall of the end punching 400 and the outer annular surface of the yoke portion 100 is L11, and the maximum distance between the yoke slot wall of the middle punching 500 and the outer annular surface of the yoke portion 100 is L12. L11 is less than L12 for at least one of the end punchings. This facilitates forming a step between the end punchings 400 and the middle punchings 500 that is recessed toward the middle punchings 500, thereby allowing the insulating skeleton to sink, thereby reducing the size of the winding ends, improving motor efficiency, and reducing motor cost.

[0065] For example, the width of the tooth portion 200 of the end punching sheet 400 is H11, the width of the tooth portion 200 of the middle punching sheet 500 is H12, and H11 of at least one of the end punching sheets is less than H12; this is conducive to forming a step between the end punching sheet 400 and the middle punching sheet 500 that is recessed toward the middle punching sheet 500, thereby achieving the sinking of the insulating skeleton, thereby reducing the size of the winding end, improving the motor efficiency and reducing the motor cost.

[0066] The present application also proposes a motor, which includes a stator core. The specific structure of the stator core refers to the above-mentioned embodiments. Since the present motor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0067] Specifically, the motor includes a stator and a rotor configured in conjunction with the stator. The stator comprises a stator core and windings. The stator core is formed by axially stacking the aforementioned stator laminations, and the windings are arranged within stator slots 300. The rotor comprises a rotor core and permanent magnets, which are arranged within the permanent magnet slots. The rotor also has multiple axially extending flow holes. The area of ​​each flow hole along the plane perpendicular to the axis is set to be ≥30 mm², thereby reducing the rotor's resistance to the compressor gas.

[0068] The conductor of the winding is, for example but not limited to, copper wire or aluminum wire; the specific material of the conductor is not limited here.

[0069] This is due to the following advantages of copper wire: First, copper wire has high electrical conductivity, approximately 310 times that of pure mercury and twice that of pure aluminum, even better than gold. Therefore, copper wire can carry more current with lower energy loss, making it more energy-efficient. Second, copper wire's electrical conductivity is stable. Under normal temperature and humidity conditions, its resistivity and conductivity remain relatively stable. Compared to other materials, copper wire exhibits less electrical property change in high-temperature and humid environments. Third, copper wire has high mechanical strength. Compared to other metal conductors, copper wire has superior mechanical strength and excellent tensile and pressure resistance. This makes copper wire more reliable and durable in use. Fourth, copper wire is easy to process. Copper wire has relatively good processability and can be produced into various specifications through methods such as drawing and rolling. It also excels in welding, riveting, and other techniques.

[0070] Secondly, aluminum wire not only has good conductivity and can effectively transmit electricity, but more importantly, it is low in price, which helps reduce the production cost of the motor.

[0071] The present application also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0072] As shown in Figure 10, in the compressor noise spectrum, the 500Hz, 1000Hz, 1600Hz, 2000Hz, and 4000Hz frequency bands associated with the motor show significant improvements in the noise of the present application compared to the prior art. The compressor noise OA value is also significantly improved compared to the prior art (improved by 3~5dB). This shows that the stator punchings proposed in the present application are applied to the compressor to help reduce the noise of the compressor.

[0073] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A stator punching sheet, wherein: The stator punching sheet comprises: a yoke, the yoke being annular; and Q teeth, each of which is spaced apart along the circumferential direction of the inner annular surface of the yoke, so as to form a stator slot between the inner annular surface of the yoke and two spaced-apart teeth; The stator slot includes a tooth slot wall located at the tooth portion and a yoke slot wall located at the inner annular surface. The maximum thickness from the yoke slot wall to the outer annular surface of the yoke portion is L1. The width of the tooth portion is H1. The relationship among Q, L1 and H1 is 0.08≤L1 / (H1*Q)≤0.

11.

2. The stator sheet according to claim 1, wherein: The distance from the center of the stator punching sheet to the midpoint of the yoke slot wall is D1, and the distance from the center of the stator punching sheet to at least one point of the yoke slot wall other than D1 is D2, satisfying D2<D1.

3. The stator sheet according to claim 1 or 2, wherein: The included angle between the yoke slot wall and the tooth slot wall is A, and the range of A is: 80°≤A≤100°.

4. The stator sheet according to any one of claims 1 to 3, wherein: When the number of teeth Q=9, the relationship among Q, L1 and H1 is: 0.085≤L1 / (H1*Q)≤0.

095.

5. The stator sheet according to any one of claims 1 to 4, wherein: When the number of teeth Q=12, the relationship among Q, L1 and H1 is: 0.085≤L1 / (H1*Q)≤0.

11.

6. The stator sheet according to any one of claims 1 to 5, wherein: When the number of teeth Q=15, the relationship among Q, L1 and H1 is: 0.08≤L1 / (H1*Q)≤0.

095.

7. The stator sheet according to any one of claims 1 to 6, wherein: The maximum thickness position of the yoke slot wall to the outer annular surface of the yoke portion is arranged close to the tooth portion.

8. The stator sheet according to any one of claims 1 to 7, wherein: The distance between the midpoint of the yoke groove wall and the outer annular surface of the yoke portion is L2, and the relationship among L2, Q and H1 is: 0.07≤L2 / (H1*Q)≤0.

1.

9. The stator sheet according to any one of claims 1 to 8, wherein: The outer annular surface of the yoke is provided with a cutting edge, and the minimum distance from the yoke slot wall to the cutting edge is L3. The relationship among L3, Q and H1 is: 0.06≤L3 / (H1*Q)≤0.

09.

10. The stator sheet according to any one of claims 1 to 9, wherein: The outer annular surface of the yoke is provided with a groove, and the minimum distance between the intersection of the yoke groove wall and the tooth groove wall and the groove wall of the groove is L4. The relationship among L4, Q and H1 is: 0.05≤L4 / (H1*Q)≤0.

07.

11. A stator core, wherein: The stator core includes a plurality of stator punching sheets according to any one of claims 1 to 10, and the plurality of stator punching sheets are stacked.

12. The stator core according to claim 11, wherein: The stator core includes two end punches located at the ends of the stator core and several middle punches arranged between the two end punches. The maximum distance from the yoke slot wall of the end punch to the outer annular surface of the yoke part is L11, and the maximum distance from the yoke slot wall of the middle punch to the outer annular surface of the yoke part is L12. L11 is less than L12 for at least one of the end punches.

13. The stator core according to claim 12, wherein: The tooth width of the end punching sheet is H11, the tooth width of the middle punching sheet is H12, and H11 of at least one of the end punching sheets is less than H12.

14. A motor, wherein: The electric motor comprises the stator core according to any one of claims 11 to 13.

15. A compressor, wherein: The compressor includes the motor of claim 14 .

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