CN219436722U - Stator, motor, compressor and refrigeration equipment - Google Patents

Abstract

The utility model provides a stator, a motor, a compressor and refrigeration equipment, wherein the stator comprises: stator core, stator core includes: the stator punching sheets are axially stacked, each stator punching sheet comprises a tooth part and a yoke part, the tooth parts are connected with the yoke part, the outer diameter of each stator punching sheet is phi, the radial width of each yoke part is L, the first connecting piece is arranged on one side of the stator punching sheet in the axial direction, the second connecting piece is arranged on the other side of the stator punching sheet in the axial direction, and two adjacent stator punching sheets are connected through the first connecting piece and the second connecting piece; wherein the distance from any point on the first connecting piece to the axis of the stator punching sheet is H, which is satisfied with (phi-2 xL)/3.ltoreq.H.ltoreq.phi-2 xL)/2.

Description

Stator, motor, compressor and refrigeration equipment

Technical Field

The utility model belongs to the technical field of motors, and particularly relates to a stator, a motor, a compressor and refrigeration equipment.

Background

As shown in fig. 1, in the related art, a stator core is formed by stacking a plurality of laminations 100', and adjacent two layers of laminations 100' are connected by a fixing portion 200 '.

The motor can produce the vortex when the during operation, and the vortex can lead to stator core to produce the heat loss, causes the efficiency of motor to reduce.

Disclosure of Invention

The present utility model aims to solve one of the technical problems existing in the prior art or related technologies.

In view of this, the present utility model proposes, in a first aspect, a stator comprising: a stator core; the stator core includes: the stator punching sheets are axially stacked and arranged, each stator punching sheet comprises a tooth part and a yoke part, the tooth parts are connected with the yoke parts, the outer diameter of each stator punching sheet is phi, and the radial width of the yoke part is L; the first connecting piece is arranged on one side of the stator punching sheet in the axial direction; the second connecting piece is arranged on the other side of the axial direction of the stator punching sheet, and two adjacent layers of stator punching sheets are connected through the first connecting piece and the second connecting piece; wherein the distance from any point on the first connecting piece to the axis of the stator punching sheet is H, which is satisfied with (phi-2 xL)/3.ltoreq.H.ltoreq.phi-2 xL)/2.

According to the stator provided by the utility model, the plurality of stator punching sheets are stacked to form the stator core, the first connecting piece and the second connecting piece are arranged on the stator punching sheets, the first connecting piece on one stator punching sheet is used for being connected with the second connecting piece on the adjacent stator punching sheet, so that the plurality of stator punching sheets are connected through the first connecting piece and the second connecting piece to form the stator core, and the first connecting piece and the second connecting piece have the connecting effect on the adjacent two layers of stator punching sheets, so that the adjacent two layers of stator punching sheets are not easy to separate, and the structural stability of the stator punching sheets is ensured.

The outer diameter of the stator punching sheet is the distance from the outer edge of the stator punching sheet to the axis of the stator punching sheet, the outer diameter phi of the stator punching sheet, the radial width L of the yoke part and the distance H from one point on the first connecting piece to the axis are satisfied, the (phi-2 xL)/3 is less than or equal to H and less than or equal to (phi-2 xL)/2, the arrangement position of the first connecting piece on the stator punching sheet is limited in the range through the formula, and the connection positions of two adjacent stator punching sheets are limited in the range, so that the eddy current loss of the stator is restrained, the heat loss of the stator core is reduced, and the efficiency of the motor is improved.

Illustratively, the first connector and the second connector are rivet structures, e.g., the first connector is a pin and the second connector is a box.

In addition, the stator in the technical scheme provided by the utility model can also have the following additional technical characteristics:

in the above technical solution, the stator core further includes: and the connecting part is arranged on one side, deviating from the axis, of the yoke part, and the first connecting piece is used for connecting two adjacent layers of stator punching sheets.

In the technical scheme, on the basis that two adjacent layers of stator punching sheets are connected through the first connecting piece and the second connecting piece, the two adjacent layers of stator punching sheets are further connected through the connecting part, at least two connecting points are arranged between the two adjacent layers of stator punching sheets, and the connection stability of the two adjacent layers of stator punching sheets is guaranteed.

The connecting portion is arranged on one side, deviating from the axis, of the yoke portion, so that the connecting portion can fix the outer edges of the stator punching sheets, separation of the outer edges of the adjacent two layers of stator punching sheets is avoided, noise generated when the motor is operated is reduced, and the motor is guaranteed to have higher efficiency.

Through increasing connecting portion for stator core has the manufacturability good, and stator core cohesion is high advantage.

In any of the above embodiments, the number of the connection portions is at least one.

In this technical solution, the number of the connection portions may be one, two or more.

When the quantity of connecting portion is one, connecting portion can set up in the arbitrary position of yoke middle outer edge, in this scheme, along the radial cutting yoke of yoke, the symmetry line of the cross-section of yoke passes through connecting portion, avoids yoke to take place to stick up the limit.

When the number of the connecting parts is two, the two connecting parts are positioned at two sides of the outer edge of the yoke part, the yoke part is cut along the radial direction of the yoke part, and the two connecting parts are symmetrically distributed compared with the symmetrical line of the section of the yoke part.

In any of the above technical solutions, the section of the first connecting member is circular or rectangular, and the section of the second connecting member is circular or rectangular, and the stator core is cut along the radial direction of the stator core.

In this technical scheme, the structure looks adaptation of first connecting piece and second connecting piece, under the condition that the cross-sectional area of first connecting piece is circular, the cross-sectional area of second connecting piece is circular.

Under the condition that the sectional areas of the first connecting piece and the second connecting piece are circular, the eddy current loss of the stator is low, the heat loss of the stator core is also low, and the efficiency of the motor is improved.

Of course, in other embodiments, the cross-sectional areas of the first and second connection members may also be set to be rectangular.

In any of the above solutions, the plurality of stator laminations includes: the first punching sheets are provided with first wire slots; the second punching sheets are positioned on two sides of the plurality of first punching sheets along the axial direction, the first punching sheets and the second punching sheets are concentrically arranged, a second wire slot is arranged on the second punching sheets, and the sectional area of the second wire slot is larger than the sectional area of the first wire slot along the radial direction of the stator punching sheets; the stator further includes: the insulation framework is provided with a plug-in connection part, and the plug-in connection part stretches into the second wire slot.

In the technical scheme, along the axial direction of the stator core, the second punching sheet is positioned at the end part in the axial direction, the first punching sheet is provided with a first wire slot, the second punching sheet is provided with a second wire slot, and the radial sectional area of the second wire slot is larger than that of the first wire slot. When the insulating framework and the stator core are assembled, the plug-in part on the insulating framework is required to be plugged into the second wire slot of the stator core, so that a part of the insulating framework is embedded into the second wire slot. The insulating framework only needs to be inserted into the second wire slot, but does not need to be inserted into the first wire slot, so that the sectional area of the first wire slot does not need to be increased for the insertion part to be inserted, the yoke part of the first chip is ensured to have a larger volume, and the performance of the motor is prevented from being influenced.

In any of the above technical solutions, the cross-sectional area of the end surface of the first punched sheet is S1, and the cross-sectional area of the end surface of the second punched sheet is S2, S2 < s1×0.8.

In this technical solution, when the cross-sectional area of the first punched piece and the cross-sectional area of the second punched piece satisfy: under the condition that S2 is less than S1×0.8, the resistance of the stator winding can be further reduced, and the material of the stator winding is reduced, so that the motor efficiency is further improved.

In any of the above technical solutions, the stator lamination includes a plurality of segmented lamination, and the plurality of segmented lamination are spliced to form the stator lamination along the circumferential direction of the stator; the stator core further includes: the first matching part is arranged at one edge extending along the radial direction in the block punching sheet; the second matching part is arranged at the other edge of the segmented punching sheet extending along the radial direction, and the first matching part in one segmented punching sheet is connected with the second matching part in the adjacent segmented punching sheet.

In this technical scheme, in order to reduce the processing degree of difficulty of stator to and improve the groove full rate of motor, set up the stator towards the piece into split type structure. The stator laminations include a plurality of segmented laminations. Through setting up the piecemeal towards the piece into a plurality ofly to when processing the stator, only process a plurality of piecemeal towards the piece can, splice a plurality of piecemeal towards the piece part again and be the stator towards the piece, compare in processing a complete stator, the degree of difficulty of processing the piecemeal towards the piece part reduces, thereby has reduced manufacturing cost, and this kind of stator simple structure, the automated production to the stator is realized to the accessible automated production line.

And, design the split type mosaic structure with the stator, be convenient for realize the winding of coil and establish, can be around establishing the back of accomplishing to installing two adjacent piecemeal punching again in the coil, reduce the degree of difficulty of establishing the coil, consequently can the stator size the same circumstances, around establishing more coils, improve the winding of coil and establish the number of turns, be favorable to improving the groove filling rate of motor. On the basis of not increasing the size of the motor, the number of turns of the winding coil is increased, so that the output torque and the motor efficiency of the motor can be improved.

The yoke has two radially extending edges, one of which is provided with a first mating portion and the other of which is provided with a second mating portion, i.e. each yoke is provided with a first mating portion and a second mating portion. The plurality of the partitioned stamped sheets are sequentially connected to form the stator stamped sheet, and in the process of assembling the partitioned stamped sheets, the first matching part on one partitioned stamped sheet is matched with the second matching part on the adjacent partitioned stamped sheet, so that the radial relative sliding of the two adjacent partitioned stamped sheets along the stator is avoided, and the structural stability of the stator stamped sheet is improved.

In one possible application, one of the first mating portion and the second mating portion is a male portion and the other is a female portion.

In a second aspect, the present utility model proposes an electric machine comprising: a stator assembly comprising a stator as in any one of the aspects of the first aspect and windings wound on the stator; and the rotor is arranged in the stator.

In a third aspect, the present utility model provides a compressor comprising: the motor in the technical scheme; or a stator as in the above-described embodiments.

In a fourth aspect, the present utility model proposes a refrigeration apparatus comprising: the compressor in the technical scheme.

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

Drawings

The foregoing and/or additional aspects and advantages of the utility model 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 shows a schematic structural view of a stator lamination in the related art;

FIG. 2 shows one of the schematic structural diagrams of a segmented stamping in an embodiment of the present utility model;

FIG. 3 illustrates one of the structural schematic diagrams of a stator lamination in an embodiment of the utility model;

FIG. 4 shows a second schematic view of a block-punched sheet according to an embodiment of the present utility model;

FIG. 5 illustrates a second schematic structural view of a stator lamination in accordance with an embodiment of the present utility model;

FIG. 6 illustrates a third schematic structural view of a stator lamination in accordance with an embodiment of the present utility model;

FIG. 7 shows a fourth schematic structural view of a stator lamination in accordance with an embodiment of the utility model;

FIG. 8 illustrates a fifth schematic structural view of a stator lamination in accordance with an embodiment of the present utility model;

FIG. 9 illustrates an exploded view of a stator lamination and an insulating skeleton in an embodiment of the utility model;

fig. 10 shows a schematic structural view of a stator in an embodiment of the present utility model.

Reference numerals:

100 'punch, 200' fixing part.

100 stator punching sheets, 110 tooth parts, 120 yoke parts, 130 block punching sheets, 140 first punching sheets, 141 first wire slots, 150 second punching sheets, 151 second wire slots, 200 first connecting pieces, 400 connecting parts, 500 first matching parts, 600 second matching parts, 700 insulating frameworks and 710 plug-in parts.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

A stator, a motor, a compressor, and a refrigerating apparatus provided according to some embodiments of the present utility model are described below with reference to fig. 2 to 10.

As shown in fig. 2 and 3, in an embodiment of the present utility model, a stator is provided, including: stator core, stator core includes: the stator punching sheet 100 comprises a tooth part 110 and a yoke part 120, the tooth part 110 is connected with the yoke part 120, the outer diameter of the stator punching sheet 100 is phi, the radial width of the yoke part 120 is L, the first connecting piece 200 is arranged on one side of the stator punching sheet 100 in the axial direction, the second connecting piece is arranged on the other side of the stator punching sheet 100 in the axial direction, and two adjacent layers of stator punching sheets 100 are connected through the first connecting piece 200 and the second connecting piece; the distance from any point on the first connector 200 to the axis of the stator lamination 100 is H, satisfying (Φ -2 XL)/3. Ltoreq.H. Ltoreq.Φ -2 XL)/2.

The stator that this embodiment provided, a plurality of stator punching 100 range upon range of setting and form stator core, be provided with first connecting piece 200 and second connecting piece on stator punching 100, first connecting piece 200 on one stator punching 100 is used for being connected with the second connecting piece on the adjacent stator punching 100 for a plurality of stator punching 100 are connected through first connecting piece 200 and second connecting piece and are formed stator core, and first connecting piece 200 and second connecting piece are to the linking effect of adjacent two-layer stator punching 100, make adjacent two-layer stator punching 100 be difficult for the separation, guarantee stator punching 100's structural stability.

The outer diameter of the stator lamination 100 is the distance from the outer edge of the stator lamination 100 to the axis of the stator lamination 100, the outer diameter Φ of the stator lamination 100, the radial width L of the yoke 120, and the distance H from a point on the first connector 200 to the axis satisfy (Φ -2×l)/3+.ltoreq.Φ -2×l)/2, and by the above formula, the arrangement position of the first connector 200 on the stator lamination 100 is limited in the range, and the connection positions of two adjacent stator laminations 100 are limited in the above range, so that the eddy current loss of the stator can be suppressed, thereby reducing the heat loss of the stator core, and being beneficial to improving the efficiency of the motor.

As shown in fig. 1, in the related art, a plurality of fixing portions 200' are generally provided on the stator lamination 100', but in the present embodiment, the arrangement position of the first connecting member 200 on the stator lamination 100 is limited to the above range, so that two adjacent stator laminations 100 can be stably connected, and the redundant fixing portions 200' in the related art can be removed, thereby not only reducing the processing difficulty of the stator, but also ensuring the structural stability of the stator, and simultaneously suppressing the eddy current loss.

Illustratively, the first connector 200 and the second connector are rivet structures, e.g., the first connector 200 is a pin and the second connector is a box.

In one possible application, the first connector 200 has a center point to axis distance H, satisfying (Φ -2 XL)/3 < H < (Φ -2 XL)/2.

As shown in conjunction with fig. 2 and 3, in the above embodiment, the stator core further includes: the connecting part 400 is arranged on one side of the yoke 120, which is away from the axis, and the first connecting piece 200 is used for connecting the adjacent two layers of stator punching sheets 100.

In this embodiment, on the basis that the adjacent two-layer stator laminations 100 are connected by the first connecting piece 200 and the second connecting piece, the adjacent two-layer stator laminations 100 are further connected by the connecting portion 400, so that at least two connection points are formed between the adjacent two-layer stator laminations 100, and the connection stability of the adjacent two-layer stator laminations 100 is ensured.

The connection part 400 is disposed at one side of the yoke part 120 away from the axis, which enables the connection part 400 to fix the outer edges of the stator laminations 100, thereby avoiding the separation of the outer edges of the adjacent two layers of stator laminations 100, reducing the noise generated when the motor operates, and ensuring the higher efficiency of the motor.

By adding the connecting part 400, the stator core has the advantages of good manufacturability and high binding force of the stator core.

In any of the above embodiments, the number of the connection parts 400 is at least one.

As shown in connection with fig. 2, 4 and 5, in this embodiment, the number of the connection parts 400 may be one, two or more.

When the number of the connection portions 400 is one, the connection portions 400 may be disposed at any position of the outer edge of the yoke portion 120, in this embodiment, the yoke portion 120 is cut along the radial direction of the yoke portion 120, and the symmetry line of the cross section of the yoke portion 120 passes through the connection portions 400, so as to avoid edge tilting of the yoke portion 120.

When the number of the connection portions 400 is two, the two connection portions 400 are located at both sides of the outer edge of the yoke 120, the yoke 120 is cut along the radial direction of the yoke 120, and the two connection portions 400 are symmetrically distributed as compared with the symmetry line of the cross section of the yoke 120.

In one possible application, the connection 400 may be a weld that connects the outer edges of adjacent two layers of stator laminations 100 by welding.

As shown in fig. 3, in any of the above embodiments, the stator core is cut along the radial direction of the stator core, the first connector 200 has a circular or rectangular cross section, and the second connector has a circular or rectangular cross section.

In this embodiment, the structures of the first connector 200 and the second connector are adapted, and in the case where the cross-sectional area of the first connector 200 is circular, the cross-sectional area of the second connector is circular.

In the case where the sectional areas of the first and second connection members 200 and 200 are circular, the eddy current loss of the stator is low, and the heat loss of the stator core is also low, which is advantageous for improving the efficiency of the motor.

Of course, in other embodiments, the cross-sectional areas of the first connector 200 and the second connector may also be set to be rectangular.

As shown in connection with fig. 6, 7, 8, 9 and 10, in any of the above embodiments, the plurality of stator laminations 100 includes: the stator punching device comprises a plurality of first punching sheets 140 and second punching sheets 150, wherein the first punching sheets 140 are provided with first wire grooves 141, the second punching sheets 150 are positioned on two sides of the plurality of first punching sheets 140 along the axial direction, the first punching sheets 140 and the second punching sheets 150 are concentrically arranged, the second punching sheets 150 are provided with second wire grooves 151, and the sectional area of the second wire grooves 151 is larger than that of the first wire grooves 141 along the radial direction of the stator punching sheet 100; the stator further includes: the insulating skeleton 700, be equipped with grafting portion 710 on the insulating skeleton 700, grafting portion 710 stretches into in the second wire casing 151.

In this embodiment, the second lamination 150 is located at an end portion in the axial direction of the stator core, the first lamination 140 is provided with the first wire groove 141, the second lamination 150 is provided with the second wire groove 151, and a radial sectional area of the second wire groove 151 is larger than a radial sectional area of the first wire groove 141. When the insulating frame 700 is assembled with the stator core, the insertion portion 710 of the insulating frame 700 needs to be inserted into the second slot 151 of the stator core, so that a part of the insulating frame 700 is inserted into the second slot 151. The insulating skeleton 700 only needs to be plugged into the second wire groove 151, but does not need to be plugged into the first wire groove 141, so that the cross section area of the first wire groove 141 does not need to be increased for the plugging portion 710 to plug, the yoke portion 120 of the first chip is ensured to have a larger volume, and the performance of the motor is not affected.

In one possible application, the number of layers of the second die 150 is multiple.

In the motor, the insulation skeleton 700 is provided with a third wire slot, and windings in the motor need to be wound into the first wire slot 141, the second wire slot 151 and the third wire slot. Embedding a portion of the insulating skeleton 700 into the second wire slot 151 may reduce the resistance of the winding, and reduce the material of the winding for improving the motor efficiency.

Along the axial direction of the stator core, the length of the plug-in connection portion 710 is smaller than the length of the second wire slot 151, and the length of the insulating framework 700 extending into the second wire slot 151 is smaller than the depth of the second wire slot 151, so that the end face of the stator core can be in direct contact fit with the bottom face of the insulating framework 700, and the connection stability of the stator core and the insulating framework 700 is ensured.

In any of the above embodiments, the cross-sectional area of the end surface of the first punch 140 is S1, and the cross-sectional area of the end surface of the second punch 150 is S2, S2 < s1×0.8.

In this embodiment, when the cross-sectional area of the first punch 140 and the cross-sectional area of the second punch 150 satisfy: under the condition that S2 is less than S1×0.8, the resistance of the stator winding can be further reduced, and the material of the stator winding is reduced, so that the motor efficiency is further improved.

In the present embodiment, the first and second punches 140 and 150 are taken along the radial direction of the stator, and the area of the cross section of the first punch 140 and the area of the cross section of the second punch 150 are the end surface cross sectional areas indicated above.

As shown in connection with fig. 2 and 3, in any of the above embodiments, the stator lamination 100 includes a plurality of segmented lamination 130, and the plurality of segmented lamination 130 are spliced to form the stator lamination 100 along the circumferential direction of the stator. The stator core further includes: the first fitting part 500 and the fitting part, the first fitting part 500 is arranged at one edge extending along the radial direction in the segmented punching sheet 130, the second fitting part 600 is arranged at the other edge extending along the radial direction in the segmented punching sheet 130, and the first fitting part 500 in one segmented punching sheet 130 is connected with the second fitting part 600 in the adjacent segmented punching sheet 130.

In this embodiment, in order to reduce the difficulty of processing the stator and to increase the slot fill rate of the motor, the stator laminations 100 are provided in a split type structure. Stator laminations 100 include a plurality of segmented laminations 130. Through setting up the piecewise punching 130 into a plurality ofly to when processing the stator, only processing a plurality of piecewise punching 130 can, splice a plurality of piecewise punching 130 parts and be stator punching 100, compare in processing a complete stator, the degree of difficulty of processing the piecewise punching 130 part reduces, thereby has reduced manufacturing cost, and this kind of stator simple structure, the automated production to the stator is realized to the accessible automated production line.

And, design the stator into split type mosaic structure, be convenient for realize the winding of coil and establish, can be around establishing the back of accomplishing to two adjacent segmentation punching 130 again and install, reduce the degree of difficulty of establishing the coil around, consequently can the same circumstances of stator size around establishing more coils, improve the winding number of turns of coil, be favorable to improving the groove full rate of motor. On the basis of not increasing the size of the motor, the number of turns of the winding coil is increased, so that the output torque and the motor efficiency of the motor can be improved.

The yoke 120 has two radially extending edges, one edge being provided with a first mating portion 500 and the other edge being provided with a second mating portion 600, i.e. each yoke 120 is provided with a first mating portion 500 and a second mating portion 600. The plurality of segmented sheets 130 are sequentially connected to form the stator sheet 100, and in the process of assembling the plurality of segmented sheets 130, the first matching part 500 on one segmented sheet 130 is matched with the second matching part 600 on the adjacent segmented sheet 130, so that the two adjacent segmented sheets 130 are prevented from sliding relatively along the radial direction of the stator, and the structural stability of the stator sheet 100 is improved.

In one possible application, one of the first mating portion 500 and the second mating portion 600 is a male portion and the other is a female portion.

In an embodiment of the present utility model, there is provided a motor including: the stator assembly comprises a stator and a winding wound on the stator as in any one of the above embodiments, and the rotor is disposed in the stator, so that the motor in this embodiment can achieve the technical effects in any one of the above embodiments, and will not be described herein.

In an embodiment of the present utility model, there is provided a compressor including: a motor as in any one of the embodiments above; or the stator in any of the above embodiments, and can achieve the same technical effects, which are not described herein.

In an embodiment of the present utility model, there is provided a refrigeration apparatus including: the compressor in the above embodiment can achieve the same technical effects, and will not be described in detail herein.

The refrigeration device in this embodiment may be a refrigerator, freezer, refrigerator, or the like.

In the present utility model, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean 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 present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A stator, comprising:

a stator core;

the stator core includes:

the stator punching sheets are axially stacked and arranged, the stator punching sheets comprise tooth parts and yoke parts, the tooth parts are connected with the yoke parts, the outer diameter of the stator punching sheets is phi, and the radial width of the yoke parts is L;

the first connecting piece is arranged on one side of the stator punching sheet in the axial direction;

the second connecting piece is arranged on the other side of the axial direction of the stator punching sheet, and two adjacent layers of stator punching sheets are connected through the first connecting piece and the second connecting piece;

wherein, the distance from any point on the first connecting piece to the axis of the stator punching sheet is H, which satisfies (phi-2 xL)/3 is less than or equal to H and less than or equal to (phi-2 xL)/2.

2. The stator of claim 1, wherein the stator core further comprises:

and the connecting part is arranged on one side, deviating from the axis, of the yoke part, and the first connecting piece is used for connecting two adjacent layers of stator punching sheets.

3. The stator of claim 2, wherein the number of connection portions is at least one.

4. A stator according to any one of claims 1 to 3, wherein the stator core is taken in a radial direction of the stator core, the first connecting member is circular or rectangular in cross section, and the second connecting member is circular or rectangular in cross section.

5. A stator according to any one of claims 1 to 3, wherein the plurality of stator laminations comprises:

the first punching sheets are provided with first wire slots;

the second punching sheets are positioned on two sides of the plurality of first punching sheets along the axial direction, the first punching sheets and the second punching sheets are concentrically arranged, a second wire slot is arranged on the second punching sheets, and the sectional area of the second wire slot is larger than the sectional area of the first wire slot along the radial direction of the stator punching sheets;

the stator further includes:

the insulation framework is provided with an inserting part, and the inserting part extends into the second wire slot.

6. The stator of claim 5 wherein the first punch has an end surface cross-sectional area S1 and the second punch has an end surface cross-sectional area S2, S2 < s1×0.8.

7. A stator according to any one of claims 1 to 3, wherein the stator laminations comprise a plurality of segmented laminations which are spliced to form the stator laminations along the circumference of the stator;

the stator core further includes:

the first matching part is arranged at one edge extending along the radial direction in the segmented punching sheet;

the second matching parts are arranged at the other edge of the segmented punching sheet, which extends along the radial direction, and the first matching part in one segmented punching sheet is connected with the second matching part in the adjacent segmented punching sheet.

8. An electric machine, the electric machine comprising:

a stator assembly comprising the stator of any one of claims 1 to 7 and a winding wound on the stator;

and the rotor is arranged in the stator.

9. A compressor, comprising:

the motor of claim 8; or (b)

The stator of any one of claims 1 to 7.

10. A refrigeration appliance, comprising:

the compressor of claim 9.