CN108471178B

CN108471178B - Stator core and motor and compressor with same

Info

Publication number: CN108471178B
Application number: CN201810549772.9A
Authority: CN
Inventors: 孙国伟; 陈汉锡; 康晓虎
Original assignee: Guangdong Welling Auto Parts Co Ltd
Current assignee: Guangdong Welling Auto Parts Co Ltd
Priority date: 2018-05-31
Filing date: 2018-05-31
Publication date: 2024-10-22
Anticipated expiration: 2038-05-31
Also published as: CN108471178A

Abstract

The invention discloses a stator core, a motor and a compressor with the stator core, wherein the stator core comprises: the stator punching sheets comprise a plurality of segmented tooth yokes with yoke sections and tooth sections, straight lines which pass through the central axis of the stator punching sheet and deflect by the same angle to the two circumferential ends of the yoke sections relative to the symmetrical planes of the tooth sections are radial division surfaces, the end surfaces of the two circumferential ends of the yoke sections are parallel to the corresponding radial division surfaces, the first ends of the two circumferential ends of the yoke sections are positioned between the corresponding radial division surfaces and the symmetrical planes, the second ends of the two circumferential ends of the yoke sections are positioned on one side, away from the symmetrical planes, of the corresponding radial division surfaces, and the projections of the end surfaces of the two circumferential ends of the yoke sections of at least two of the stator punching sheets on planes perpendicular to the central axis of the stator core are not completely overlapped. According to the stator core, operations such as winding and the like of the stator core are facilitated, the overall rigidity of the stator core is improved, the motor efficiency can be improved, and noise can be reduced.

Description

Stator core and motor and compressor with same

Technical Field

The invention relates to the technical field of motors, in particular to a stator core, a motor with the stator core and a compressor with the stator core.

Background

Permanent magnet synchronous motors are widely used in household appliances such as compressors and blowers of household air conditioners. With the continuous improvement of the national requirements for energy efficiency grade, the improvement of the efficiency of the motor is also receiving more and more attention. With respect to compressors, with the trend of miniaturization design of compressors, the efficiency of motors matched with compressors is also higher and higher, and the cost requirements of compressors are also higher and higher due to the strong market competition. Specifically, for example, because the motor of the compressor needs to be thermally jacketed with the housing of the compressor, the roundness requirement of the outer diameter of the stator of the motor is high, and in addition, because of the requirement of the compressor noise, the stator yoke of the motor needs to maintain high rigidity.

In the related art, the stator core may adopt a segmented stator core structure, specifically, the segmented stator core structure divides the stator core into a plurality of parts in the circumferential direction of the stator core, adjacent parts are connected in a matched manner through the rotating shaft and the convex part and the concave part, and at this time, the stator core has a plurality of joints which are arranged at intervals in the circumferential direction of the stator core and linearly extend along the axial direction of the stator core, so that the utilization rate of the stator slot can be improved, and the power density, the efficiency and the cost performance of the motor can be further improved.

However, such a direct-blocking method as described above causes a decrease in manufacturing efficiency due to the assembly between the blocked cores, and also decreases in rigidity of the stator yoke relative to the integral stator core. In addition, due to the high-frequency operation requirement of the motor, the joints among the blocks of the stator core are conducted with each other, and at high frequency, the stator core forms large vortex, so that the motor efficiency is reduced. In addition, the presence of an additional air gap in the stator yoke due to the presence of a gap near the rotating shaft may cause a decrease in motor efficiency. In addition, since the rotary shaft and the convex and concave portions are required to be punched on the stator lamination, the precision and complexity of the die are high, and the manufacturing cost is high.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a stator core that can be easily subjected to subsequent winding operations.

Another object of the present invention is to provide an electric machine having the above stator core.

A further object of the present invention is to propose a compressor with a motor as described above.

A stator core according to an embodiment of a first aspect of the present invention includes: the stator punching sheet comprises a plurality of segmented tooth yokes which are sequentially connected end to end along the circumferential direction, each segmented tooth yoke comprises a yoke section and teeth connected to the inner side of the yoke section, the yoke sections are sequentially connected end to end along the circumferential direction, a stator slot is defined between two adjacent teeth, a straight line passing through the central axis of the stator punching sheet and respectively deflecting by the same angle relative to the symmetrical plane of the teeth to the circumferential two ends of the yoke section is a radial division plane, the end faces of the circumferential two ends of the yoke section are respectively parallel to the corresponding radial division plane, a first end of the circumferential two ends of the yoke section is positioned between the corresponding radial division plane and the symmetrical plane, a second end of the circumferential two ends of the yoke section is positioned on one side of the corresponding radial division plane far away from the symmetrical plane, a straight line passing through the central axis of any one of the stator punching sheet and respectively deflects by the same angle relative to the circumferential two ends of the yoke section is a radial division plane, and the projection of the first end of the circumferential two ends of the yoke section and the second end of the adjacent yoke section are positioned on at least two perpendicular planes of the adjacent stator punching sheet.

According to the stator core provided by the embodiment of the invention, the end faces of the two circumferential ends of the yoke section are respectively parallel to the corresponding radial dividing surfaces, so that the stator core is convenient to perform subsequent winding and other operations. Moreover, by arranging such that the first ends of the circumferential ends of the yoke sections are located between the corresponding radial split surfaces and the symmetry plane, the second ends of the circumferential ends of the yoke sections are located on the side of the corresponding radial split surfaces away from the symmetry plane, and projections of the circumferential end surfaces of the yoke sections of at least two of the plurality of stator laminations on the plane perpendicular to the central axis of the stator core are not completely overlapped, the overall rigidity of the stator core is improved, eddy current loss at the time of high-frequency operation can be reduced, the slot filling rate can be improved, and the motor efficiency can be improved and noise can be reduced when the stator core is applied to a motor.

According to some embodiments of the invention, the inner circumferential surface of the first end of any one of the yoke sections of each stator lamination is offset from the inner circumferential surface of the second end of an adjacent yoke section in the radial direction of the stator lamination.

According to some embodiments of the invention, the outer circumferential surface of each stator lamination at the junction of two adjacent yoke sections is located inside the outer circumferential surface of the stator lamination corresponding to the teeth.

According to some embodiments of the invention, the outer peripheral surface of the first end of each yoke section has a first peripheral surface section and the outer peripheral surface of the second end has a second peripheral surface section, the first peripheral surface section and the second peripheral surface section being located inside the outer peripheral surface of the stator lamination corresponding to the tooth portion, and the length of the first peripheral surface section being smaller than the length of the second peripheral surface section in the circumferential direction of the stator lamination.

According to some embodiments of the invention, the outer peripheral surface of the circumferential ends of each yoke section and the outer peripheral surface of the corresponding tooth portion of the stator lamination are respectively formed as cambered surfaces.

According to some embodiments of the invention, the yoke section has circumferential end faces at equal distances from the corresponding radial split faces.

According to some embodiments of the invention, a distance between any one of the circumferential ends of the yoke section and the corresponding radially split surface is d, wherein d satisfies: d is more than or equal to 0.5mm and less than or equal to 5mm.

According to some embodiments of the invention, the sum of overlapping areas of the circumferential two ends of all the yoke sections of the at least two of the plurality of stator laminations on a plane perpendicular to the central axis of the stator core is more than 5% of the area of the stator laminations.

According to some embodiments of the invention, the plurality of stator laminations comprises at least one set of first stator lamination groups and at least one set of second stator lamination groups arranged in an axial staggered manner, each set of first stator lamination groups comprising at least one first stator lamination in a circumferential clockwise direction with the first end of the same yoke section being located upstream of the second end, each set of second stator lamination groups comprising at least one second stator lamination in a circumferential clockwise direction with the first end of the same yoke section being located downstream of the second end.

According to some embodiments of the invention, a dovetail groove or a T-shaped groove is formed on an outer peripheral surface of each of the yoke sections.

According to some embodiments of the invention, each of the stator laminations has a thickness of less than 1mm.

According to some embodiments of the invention, each of the stator laminations is a sheet of silicon steel having a thickness greater than 0.3 mm.

An electric machine according to an embodiment of a second aspect of the present invention includes a stator core according to the embodiment of the above first aspect of the present invention.

A compressor according to an embodiment of the third aspect of the present invention includes a motor according to an embodiment of the above-described second aspect of the present invention.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a perspective view of a stator core according to an embodiment of the present invention;

fig. 2 is a front view of the stator core shown in fig. 1;

FIG. 3 is an enlarged view of portion A, circled in FIG. 2;

FIG. 4 is a perspective view of the plurality of segmented tooth yokes shown in FIG. 1 stacked in an axial direction;

FIG. 5 is a top view of the plurality of segmented tooth yokes shown in FIG. 4;

FIG. 6 is a schematic diagram of a segmented tooth yoke in accordance with an embodiment of the present invention;

FIG. 7 is a schematic illustration of a first stator lamination and a second stator lamination in accordance with an embodiment of the invention;

fig. 8 is a perspective view of a stator core in an initial unfolded state a according to an embodiment of the present invention;

fig. 9 is a front view of the stator core shown in fig. 8 in an initial unfolded state a;

Fig. 10 is a front view of a stator core according to an embodiment of the present invention when it is unfolded from an initial unfolded state a to an intermediate unfolded state b;

fig. 11 is a perspective view of the stator core according to the embodiment of the present invention when further expanded from the intermediate expanded state b to the linear state c;

Fig. 12 is a front view of the stator core according to the embodiment of the present invention when the stator core is unfolded from the straight state c to the limit state d;

Fig. 13 is a perspective view of a stator core in a limit state d according to an embodiment of the present invention;

Fig. 14 is a perspective view of a stator core according to another embodiment of the present invention;

fig. 15 is a front view of the stator core shown in fig. 14;

fig. 16 is a schematic view of a stator core according to an embodiment of the present invention in which coils are provided in one of stator slots.

Reference numerals:

100: a stator core;

1: stator punching; 11: a segmented tooth yoke;

111: a yoke section; 1111: a first end; 1112: a second end;

1113: a first peripheral section; 1114: a second peripheral surface section;

1115: a dovetail groove; 112: a tooth portion;

1121: a plane of symmetry; 1122: a radial dividing surface;

113: a stator groove; 12: a first stator punching sheet;

13: an overlap region;

201: a coil.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

A stator core 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 16.

As shown in fig. 1 to 16, a stator core 100 according to an embodiment of the first aspect of the present invention includes a plurality of stator laminations 1.

Specifically, referring to fig. 1 and 2, a plurality of stator laminations 1 are stacked in an axial direction (e.g., a thickness direction of the stator laminations 1 in fig. 1), each stator lamination 1 includes a plurality of segmented tooth yokes 11 connected end to end in sequence in a circumferential direction, each segmented tooth yoke 11 includes a yoke section 111 and teeth 112 connected inside the yoke section 111, the plurality of yoke sections 111 are connected end to end in sequence in the circumferential direction, and a stator slot 113 is defined between two adjacent teeth 112. Here, it should be noted that the direction "in" is understood as a direction toward the center of the stator lamination 1, and the opposite direction is defined as "out", i.e., a direction away from the center of the stator lamination 1.

As shown in fig. 6, straight lines passing through the central axis of the stator punch 1 and respectively deflected by the same angle toward the circumferential both ends of the yoke section 111 with respect to the symmetry plane 1121 of the tooth 112 are radial division surfaces 1122, the circumferential both end surfaces (e.g., left and right end surfaces in fig. 6) of the yoke section 111 are respectively parallel to the corresponding radial division surfaces 1122, a first end 1111 (e.g., left end in fig. 6) of the circumferential both ends of the yoke section 111 is located between the corresponding radial division surfaces 1122 and the symmetry plane 1121 of the tooth 112, and a second end 1112 (e.g., right end in fig. 6) of the circumferential both ends of the yoke section 111 is located on the side of the corresponding radial division surfaces 1122 away from the symmetry plane 1121 of the tooth 112. At this time, the first end 1111 of the yoke section 111 is spaced apart from the corresponding left radial split surface 1122, and the second end 1112 of the yoke section 111 is spaced apart from the corresponding right radial split surface 1122 to the right. The lengths of the yoke section 111 extending leftward and rightward from the symmetry plane 1121 of the tooth 112 are unequal, and the length of the yoke section 111 extending leftward from the symmetry plane 1121 of the tooth 112 is smaller than the length of the yoke section 111 extending rightward from the symmetry plane 1121 of the tooth 112, the yoke section 111 being asymmetric with respect to the symmetry plane 1121 of the tooth 112.

Thus, by providing the respective circumferential end surfaces of the yoke section 111 in parallel with the corresponding radial split surfaces 1122, for example, the respective circumferential end surfaces of the yoke section 111 can be formed into flat surfaces, the accuracy and complexity of the mold are reduced, and the manufacturing cost is reduced, as compared with the conventional necessity of machining the convex portions and concave portions on the stator lamination 1. Moreover, by providing such that the first ends 1111 of the circumferential ends of the yoke section 111 are located between the corresponding radial split surfaces 1122 and the symmetry plane 1121 of the tooth 112 and such that the second ends 1112 of the circumferential ends of the yoke section 111 are located on the side of the corresponding radial split surfaces 1122 away from the symmetry plane 1121 of the tooth 112, when a plurality of stator laminations 1 are stacked in the axial direction, "projection of the circumferential end surfaces of the yoke section 111 of at least two of the plurality of stator laminations 1 onto a plane perpendicular to the central axis of the stator core 100 does not completely coincide" described below can be well achieved.

The first end 1111 of any one yoke section 111 of each stator lamination 1 is disposed adjacent to the second end 1112 of an adjacent yoke section 111. For example, in the example of fig. 2, each stator core 1 of the stator core 100 may be obtained by rotating one of the divided tooth yokes 11 about the center of the stator core 1 in twelve copies. Thereby, a gap between circumferentially adjacent two yoke sections 111 can be well ensured, so that the problem of a decrease in motor efficiency due to an additional air gap generated by the presence of a gap near the rotation axis of the conventional stator core 100 is solved, that is, when the stator core 100 according to the embodiment of the present invention is applied to a motor, the motor efficiency can be improved.

The projections of the circumferential both end faces of the yoke sections 111 of at least two of the plurality of stator laminations 1 (e.g., the joint faces between the adjacent two yoke sections 111) on a plane perpendicular to the central axis of the stator core 100 do not completely coincide. Here, the following two cases are included: the projections of the two end surfaces of the yoke section 111 of at least two stator punching sheets 1 in the circumferential direction of the first plurality of stator punching sheets 1 on the plane perpendicular to the central axis of the stator core 100 are completely misaligned, and the joint surfaces of the at least two stator punching sheets 1 are completely staggered in the circumferential direction of the stator core 100; the projections of the circumferential end faces of the yoke sections 111 of at least two of the second plurality of stator laminations 1 on a plane perpendicular to the central axis of the stator core 100 only partially coincide, for example, intersect at a point as shown in fig. 7. Thus, by providing such that projections of the circumferential both end surfaces of the yoke section 111 of at least two of the plurality of stator laminations 1 on a plane perpendicular to the central axis of the stator core 100 do not completely coincide, additional air gaps and eddy currents due to the joint surfaces can be improved, motor efficiency is relatively improved, and eddy current loss formed between the stator laminations 1 at the time of high frequency operation can be avoided when the stator core 100 according to the embodiment of the present invention is applied to a motor. Moreover, since the overlap region 13 is formed at the connection between the two adjacent yoke sections 111 in the circumferential direction in the axial direction of the stator core 100, the rigidity of the stator core 100 according to the embodiment of the present invention is greater than that of the conventional stator core 100 employing the structure of the segmented stator core 100, so that the compressor can have better noise when the stator core 100 according to the embodiment of the present invention is applied to the compressor.

The stator core 100 according to the embodiment of the present invention may be maintained as a single body during the punching and heat treatment of the stator core 100; during the winding process, the stator core 100 may be opened by the auxiliary tool, and winding is performed without limitation.

Specifically, for example, a stator core 100 including twelve segmented tooth yokes 11 per stator die 1 is shown in the examples of fig. 8-13. Fig. 8 is a perspective view of the stator core 100 in the initial unfolded state a, and defines that the split tooth yoke 11 on the right side of the unfolded position of the stator core 100 is the first split tooth yoke 11, the split tooth yoke 11 on the left side is the twelfth split tooth yoke 11, and the ten split tooth yokes 11 in the middle are the second to eleventh split tooth yokes 11 in sequence in the clockwise direction in the circumferential direction of the stator core 100. As can be seen from fig. 8, the stator core 100 can be rotated around a certain rotation axis outside the stator core 100 at the joint of the seventh and eighth divided tooth yokes 11, so that the stator core 100 can be unfolded from the full-circle state shown in fig. 1 into the separated state.

Fig. 9 is a front view of the stator core 100 in the initial expanded state a shown in fig. 8, wherein the broken lines represent invisible seams of the axial interlayer seams. As can be appreciated from fig. 9, the stator core 100 can convert the stator core 100 from the closed state shown in fig. 1 to the open state by means of the rotation shaft outside the stator core 100, and in this process, the joints between the block tooth yokes 11 do not interfere, so that smooth unfolding of the stator core 100 can be achieved, and winding is facilitated.

Fig. 10 is a schematic view of the stator core 100 in the intermediate expanded state b before being further expanded from the initial expanded state a shown in fig. 9 to the linear state c. As can be seen from fig. 10, there are still portions of adjacent segment tooth yokes 11 that are staggered with respect to each other during the unfolding to the straight state c. Here, the center of a circle located outside the stator core 100 shown in fig. 10 is the center of the rotation axis in the unfolded-to-straight state c.

Fig. 11 is a perspective view of the stator core 100 further unfolded from the intermediate unfolded state b of fig. 10 to the linear state c, and it can be seen that there are still areas overlapping each other between the adjacent ones of the twelve segmented tooth yokes 11, thereby reducing the difficulty of restoring the stator core 100 from the linear state c to the full-circle state shown in fig. 1 after the winding is completed and improving the manufacturing efficiency.

Fig. 12 and 13 are schematic views of the stator core 100 when it is expanded to the limit state d. As can be seen from the figure, small areas of the twelve segmented tooth yokes 11 are overlapped alternately, and meanwhile, two sides of the tooth 112 of each segmented tooth yoke 11 have a larger area space, so that a larger space is provided for simultaneous winding of the twelve tooth 112, the winding flatness of the tooth 112 is improved, and the slot filling rate of the stator is further improved.

Therefore, when the stator core 100 of the embodiment of the present invention performs processes such as high-punching and heat treatment, the integral closed state shown in fig. 1 is adopted, so that the conventional block splicing process is reduced, and the production and manufacturing efficiency is improved. When the stator core 100 needs to be wound, the stator core 100 may be unwound into the state shown in fig. 11 or 12 through an auxiliary tool to perform winding. In the state shown in fig. 11 or 12, the stator core 100 may be fixed by an auxiliary tool, and an insulating block (not shown) may be inserted and wound. After the winding of the stator core 100 is completed, the stator core 100 is closed to the state shown in fig. 1 through an auxiliary tool, and the stator core 100 is appropriately fixed at the joint to form a complete stator, so that the stator core 100 is prevented from being unfolded again.

Here, it should be noted that, since the axial both end surfaces of the yoke section 111 are respectively disposed in parallel with the corresponding radial split surfaces 1122, the stator core 100 according to the embodiment of the present invention may be expanded in a manner of being drawn out in the radial direction in addition to the linear expansion manner shown in fig. 8 to 10, specifically, for example, a stack of the split tooth yokes 11 stacked in the axial direction out of the plurality of stator laminations 1 of the stator core 100 shown in fig. 1 may be drawn out in the radial direction, resulting in the stacking of the plurality of split tooth yokes 11 stacked in the axial direction shown in fig. 4 and 5, after which the operations such as winding may be performed. It will be appreciated that the specific deployment of the stator core 100 may be specifically selected according to the practical application to better meet the practical requirements.

According to the stator core 100 of the embodiment of the present invention, the end surfaces of the yoke section 111 at both circumferential ends are respectively parallel to the corresponding radial split surfaces 1122, so that the stator core 100 can be conveniently subjected to subsequent winding and the like. Moreover, by providing such that the first ends 1111 of the circumferential both ends of the yoke section 111 are located between the corresponding radial split surfaces 1122 and the symmetry plane 1121, the second ends 1112 of the circumferential both ends of the yoke section 111 are located on the side of the corresponding radial split surfaces 1122 away from the symmetry plane 1121, and the projections of the circumferential both end surfaces of the yoke section 111 of at least two of the plurality of stator laminations 1 on the plane perpendicular to the central axis of the stator core 100 do not completely coincide, the overall rigidity of the stator core 100 is improved, and when the stator core 100 is applied to a motor, the eddy current loss at the time of high-frequency operation can be reduced, the slot fullness rate can be improved, and the motor efficiency can be improved, and the noise at the time of operation can be reduced.

According to some embodiments of the present invention, referring to fig. 1 in combination with fig. 2 and 3, the inner circumferential surface of the first end 1111 of any one yoke section 111 of each stator lamination 1 is offset from the inner circumferential surface of the second end 1112 of the adjacent yoke section 111 in the radial direction of the stator lamination 1. Thus, the magnetic density can be improved, and when the stator core 100 is applied to a motor, the motor efficiency can be improved, thereby improving the performance of the motor. In addition, the stator punching sheet 1 is convenient to process and manufacture, and the processing difficulty is reduced, so that the cost can be reduced.

According to some embodiments of the present invention, as shown in fig. 2 and 3, the outer peripheral surface of each stator lamination 1 at the junction of two adjacent yoke sections 111 is located inside the outer peripheral surface of the corresponding tooth 112 of the stator lamination 1. Thus, by disposing the positions of the corresponding joints of the stator core 100 inside the maximum size of the outer periphery of the entire stator core 100, for example, when the stator core 100 is mounted in the casing of the compressor, the joints are not in contact with the inner wall of the casing, so that the joints of the stator core 100 are not stressed, thereby reducing core loss and reducing vibration noise at the time of operation.

Further, referring to fig. 2 in combination with fig. 3, the outer peripheral surface of the first end 1111 of each yoke section 111 has a first peripheral section 1113 and the outer peripheral surface of the second end 1112 has a second peripheral section 1114, the first peripheral section 1113 and the second peripheral section 1114 are located inside the outer peripheral surface of the corresponding tooth 112 of the stator punching sheet 1, and the length of the first peripheral section 1113 is smaller than the length of the second peripheral section 1114 in the circumferential direction of the stator punching sheet 1. Thus, since the length of the second end 1112 of the yoke section 111 is greater than the length of the first end 1111 thereof, by providing the length of the first circumferential section 1113 to be smaller than the length of the second circumferential section 1114, the outer circumferential surfaces of the corresponding teeth 112 of the yoke section 111 can be made substantially symmetrical along the symmetry plane 1121 of the teeth 112 while ensuring no stress at the joints of the stator core 100 to reduce core loss and vibration noise, thereby making the structure of the entire stator core 100 relatively uniform and ensuring the structural strength of the stator core 100.

Alternatively, the outer peripheral surfaces of the both ends in the circumferential direction of each yoke section 111 and the outer peripheral surfaces of the corresponding teeth 112 of the stator lamination 1 are respectively formed as cambered surfaces. The outer diameter of the joint of the stator core 100 is smaller than the maximum outer diameter of the stator core 100 at this time. Thereby, the processing of the stator core 100 is facilitated, and the stator core 100 can be better fitted in the cylindrical casing of the compressor.

According to some embodiments of the present invention, as shown in fig. 6, the circumferential end surfaces of the yoke section 111 are respectively equidistant from the corresponding radial split surfaces 1122. Thereby, the processing of the stator core 100 is facilitated and the cost is saved.

Alternatively, the distance between either end face of the yoke section 111 in the circumferential direction and the corresponding radially split face 1122 is d, where the distance d satisfies: d is more than or equal to 0.5mm and less than or equal to 5mm. Thus, when the distance d is less than 0.5mm, the overlapping area 13 between the stator laminations 1 is too small, the rigidity of the stator core 100 is difficult to be ensured, and the vibration noise of the motor is increased; when the distance d is greater than 5mm, the overlap region 13 between the stator laminations 1 is too large, increasing the difficulty of the stator core 100 in expanding from the full-circle state shown in fig. 1 to the expanded state shown in fig. 11 or 12, and making the manufacturability worse. In other words, by setting the distance d between 0.5mm and 5mm, the manufacturing performance of the stator core 100 is improved, and the rigidity of the stator core 100 is ensured, reducing the vibration noise of the motor. Further, d further satisfies: d=2mm.

According to some embodiments of the present invention, as shown in fig. 6, the sum of overlapping areas of both circumferential ends of all yoke sections 111 of the above-mentioned at least two of the plurality of stator laminations 1 on a plane perpendicular to the central axis of the stator core 100 accounts for more than 5% of the area of the stator lamination 1. For example, referring to fig. 6, when the plurality of stator laminations 1 includes at least two types of stator laminations 1 in which projections of the circumferential end faces of the yoke sections 111 on a plane perpendicular to the central axis of the stator core 100 do not completely coincide, the sum of overlapping areas of the circumferential ends of all the yoke sections 111 of the two types of stator laminations 1 on a plane perpendicular to the central axis of the stator core 100 accounts for 5% or more (including 5%) of the area of the stator laminations 1. Thus, if it is provided that the sum of the overlapping areas of the circumferential both ends of all the yoke sections 111 of the above-mentioned at least two of the plurality of stator laminations 1 on the plane perpendicular to the central axis of the stator core 100 is less than 5% of the area of the stator lamination 1, the overlapping area of the ends of the axially stacked segmented tooth yokes 11 is small, so that the rigidity of the entire stator core 100 is insufficient, and the contact area is small, thereby reducing the friction, increasing the radial vibration when the motor is operated, and thus generating a large vibration noise. That is, by setting the sum of the overlapping areas of the circumferential both ends of all the yoke sections 111 of at least two of the plurality of stator laminations 1 on the plane perpendicular to the central axis of the stator core 100 to be 5% or more of the area of the stator lamination 1, the rigidity of the entire stator core 100 can be improved, reducing the radial vibration and vibration noise when the motor is operated.

According to some embodiments of the present invention, as shown in fig. 1, 4-5, and 14-15, the plurality of stator laminations 1 includes at least one set of first stator laminations 12 and at least one set of second stator laminations 1 arranged in an axially staggered manner, each set of first stator laminations 12 including at least one first stator lamination 12 (as shown in fig. 2) circumferentially clockwise with the first end 1111 of the same yoke segment 111 upstream of the second end 1112, and each set of second stator laminations 1 including at least one second stator lamination 1 circumferentially clockwise with the first end 1111 of the same yoke segment 111 downstream of the second end 1112. For example, referring to fig. 4 in combination with fig. 5, a plurality of axially corresponding segmented tooth yokes 11 are stacked in a positive and negative staggered manner along a symmetry plane 1121 of the tooth 112, and the stator lamination 1 is stacked in a minimum interval in the positive and negative staggered manner in the axial direction. Thus, by adopting the first stator punching sheet 12 group constituted by the first stator punching sheet 12 and the second stator punching sheet 1 group constituted by the second stator punching sheet 1, the processing of the stator core 100 is facilitated, and the cost is reduced.

For example, in the examples of fig. 1 and 4-5, the plurality of stator laminations 1 includes a plurality of sets of first stator laminations 12 and a plurality of sets of second stator laminations 1 arranged in an axially staggered manner, each set of first stator laminations 12 including one of the above-described first stator laminations 12, and each set of sets of second stator laminations 1 including one of the above-described second stator laminations 1. In the example of fig. 14 and 15, the plurality of stator laminations 1 includes a plurality of groups of first stator laminations 12 and a plurality of groups of second stator laminations 1 arranged alternately in the axial direction, each group of first stator laminations 12 including three of the above-described first stator laminations 12, and each group of second stator laminations 1 including three of the above-described second stator laminations 1. It will be appreciated that the number of first stator laminations 12 in each set of first stator laminations 12 and the number of second stator laminations 1 in each set of second stator laminations 1 can be specifically set according to the actual requirements to better meet the actual application.

Also, as shown in fig. 7 and 15, since the joints are completely staggered in the axial direction, the eddy current at the joints of the stator core 100 does not form a large cycle when the motor is operated at a high frequency, and thus the stator core 100 according to the embodiment of the present invention has the same core loss as the monolithic core. Meanwhile, since a staggered region of, for example, 4mm length can be formed between adjacent segmented tooth yokes 11, the rigidity of the plurality of yoke sections 111 of the stator core 100, which are sequentially connected end to end in the circumferential direction, is improved, and the radial vibration of the motor is small.

Alternatively, as shown in fig. 1 and 2, a dovetail groove 1115 is formed on the outer peripheral surface of each yoke section 111. Thus, by providing the dovetail 1115, when winding is required, the stator core 100 can be unfolded by means of an auxiliary tool (not shown), specifically, the auxiliary tool can include a plurality of tool blocks which are sequentially pivotably connected, each tool block can have a positioning structure which is matched with the dovetail 1115, the plurality of tool blocks can be arranged on the outer side of the stator core 100 and respectively fixed with the yoke sections 111 of the corresponding plurality of segmented tooth yokes 11 which are overlapped along the axis by the positioning structure, and the plurality of segmented tooth yokes 11 which are overlapped along the axis can be driven to be synchronously unfolded when the plurality of tool blocks are unfolded, thereby realizing winding. Of course, a T-shaped groove (not shown) or the like may also be formed on the outer peripheral surface of each yoke section 111.

During the winding process, the stator core 100 according to the embodiment of the present invention may be fully opened for winding, and thus, the size of the slot opening of the stator slot 113 may be optimized without being limited by the winding process. For example, as shown in fig. 16, since the slot width of the stator slot 113 is 2mm and the stator core 100 is closed after winding, the distance between two adjacent coils 201 in the same stator slot 113 can be made as small as possible and the distance between two adjacent coils 201 in the same stator slot 113 can be made 1mm. This improves the slot filling rate, and the coils 201 can be aligned in the stator slots 113.

Optionally, the thickness of each stator lamination 1 is less than 1mm. But is not limited thereto.

Alternatively, each stator lamination 1 is a sheet of silicon steel having a thickness greater than 0.3 mm. But is not limited thereto.

It should be noted that twelve stator slots 113 are shown in fig. 1 and 14 for illustration purposes, but it is obvious to one of ordinary skill in the art that the present invention can be applied to less than twelve or more than twelve stator slots 113 after reading the following technical solutions, and the present invention is also within the scope of the present invention.

According to the stator core 100 of the embodiment of the present invention, the stator core 100 remains as a whole during the punching and heat treatment of the stator core 100, and the stator core 100 can be opened by an auxiliary tool during the winding process, and the winding is performed without limitation. Meanwhile, the joints of the stator core 100 can be completely staggered in the axial direction, so that eddy current loss is avoided from being formed between the stator punching sheets 1 during high-frequency operation. In addition, the yoke sections 111 of the stator punching sheets 1 have larger overlapping areas 13, so that the overall rigidity of the stator core 100 is improved, and the compressor adopting the stator core 100 provided by the embodiment of the invention has better noise.

An electric motor according to an embodiment of the second aspect of the present invention includes the stator core 100 according to the above-described embodiment of the first aspect of the present invention. The motor can be widely applied to household appliances such as fans, air conditioners and the like. But is not limited thereto.

According to the motor provided by the embodiment of the invention, the stator core 100 is adopted, so that the full rate of the motor slot is greatly improved, and meanwhile, the slots of the relatively smaller stator slots 113 can be formed, and the market competitiveness of the motor can be improved.

According to the compressor provided by the embodiment of the invention, on the premise of maintaining the reliability of the compressor unchanged, the volume of the motor can be greatly reduced, and the compressor is beneficial to miniaturization.

Other constructions and operations of compressors according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A stator core, comprising:

a plurality of stator punching sheets stacked along the axial direction, each stator punching sheet comprises a plurality of segmented tooth yokes connected end to end in sequence along the circumferential direction, each segmented tooth yoke comprises a yoke section and teeth connected to the inner side of the yoke section, the plurality of yoke sections are connected end to end in sequence along the circumferential direction, a stator slot is defined between two adjacent teeth, a straight line passing through the central axis of the stator punching sheet and respectively deflected by the same angle towards two circumferential ends of the yoke section relative to the symmetrical plane of the teeth is a radial division plane, the end faces of the two circumferential ends of the yoke section are respectively parallel to the corresponding radial division plane, a first end of the two circumferential ends of the yoke section is positioned between the corresponding radial division plane and the symmetrical plane, a second end of the two circumferential ends of the yoke section is positioned at one side of the corresponding radial division plane far away from the symmetrical plane, and the projection of the first end of any one of the yoke section of the stator punching sheet and the two adjacent stator sections is positioned at least perpendicular to the projection plane of the second end of the adjacent yoke section of the stator punching sheet;

The outer peripheral surface of each stator punching sheet at the joint of two adjacent yoke sections is positioned at the inner side of the outer peripheral surface of the stator punching sheet corresponding to the tooth part;

The outer peripheral surface of the first end of each yoke section has a first peripheral surface section and the outer peripheral surface of the second end has a second peripheral surface section, the first peripheral surface section and the second peripheral surface section are located inside the outer peripheral surface of the stator punching sheet corresponding to the teeth, and the length of the first peripheral surface section is smaller than the length of the second peripheral surface section in the circumferential direction of the stator punching sheet, so that the outer peripheral surface of the corresponding teeth of the yoke section is approximately symmetrical along the symmetry plane of the teeth.

2. The stator core of claim 1, wherein an inner peripheral surface of the first end of any one of the yoke sections of each stator lamination is offset from an inner peripheral surface of the second end of an adjacent yoke section in a radial direction of the stator lamination.

3. The stator core according to claim 1, wherein an outer peripheral surface of both ends in a circumferential direction of each of the yoke sections and an outer peripheral surface of the corresponding tooth portion of the stator lamination are respectively formed as arc surfaces.

4. The stator core according to claim 1, wherein both end surfaces in the circumferential direction of the yoke section are respectively equidistant from the corresponding radial dividing surfaces.

5. The stator core according to claim 1, wherein a distance between either one end face of the yoke section in the circumferential direction and the corresponding radial split face is d, wherein the d satisfies: d is more than or equal to 0.5mm and less than or equal to 5mm.

6. The stator core of claim 1, wherein a sum of overlapping areas of circumferential ends of all the yoke sections of the at least two of the plurality of stator laminations on a plane perpendicular to a central axis of the stator core is 5% or more of an area of the stator laminations.

7. The stator core of any of claims 1-6, wherein a plurality of the stator laminations includes at least one set of first stator laminations and at least one set of second stator laminations arranged in an axial staggered manner, each set of first stator laminations including at least one first stator lamination in a circumferential clockwise direction with the first end of the same yoke segment being located upstream of the second end, each set of second stator laminations including at least one second stator lamination in a circumferential clockwise direction with the first end of the same yoke segment being located downstream of the second end.

8. The stator core according to claim 1, wherein a dovetail groove or a T-shaped groove is formed on an outer peripheral surface of each of the yoke sections.

9. The stator core of claim 1 wherein each of the stator laminations has a thickness of less than 1mm.

10. The stator core of claim 9, wherein each of the stator laminations is a sheet of silicon steel having a thickness greater than 0.3 mm.

11. An electric machine comprising a stator core according to any one of claims 1-10.

12. A compressor is characterized in that, comprising an electric machine according to claim 11.