Stator core, stator core group, stator and motor thereof

Abstract

A stator iron core mainly solves the technical problems that an existing stator iron core is complex in machining, difficult in stator assembly, high in stator manufacturing cost and the like. According to the technical scheme, a stator core comprises a top face, a middle face, a base face, a side face set A, a side face set B and an inclined side face set, the top face is connected with the middle face through the side face set A, the side face set B is adjacent to the inclined side face set, and the middle face is connected with the base face through the inclined side face set and the side face set B in sequence. The area of the top surface on the cross section of the stator core is smaller than the area of the middle surface on the cross section, and the area of the middle surface on the cross section is smaller than the area of the base surface on the cross section.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of motor technical field, especially a stator core, stator core group, stator and its motor. BACKGROUND

[0002] Stator is the core component in motor design, it is related to the performance of motor, also directly affects the reliability and efficiency of motor, and stator core as the basis of stator composition is particularly important, usually the stator core of motor adopts silicon steel sheet to stack combination to form a whole or adopts silicon steel sheet to wind combination to form a whole, these ways can make the coil slot of stator core disorder, cause the coil of stator to be unable to be embedded in stator core;There are also segmented combination of the stator core of motor, for example: public number: CN110474452A, a disc type core and disc type motor, through disc type core base and two different core tooth combination structure, but this way needs to increase multiple core molds in production process, increases core manufacturing difficulty, increases motor manufacturing process time and material cost.

[0003] Therefore, how to guarantee the advantages in prior art, while reducing manufacturing difficulty, saving time and material cost, is a problem to be solved by the person skilled in the art. SUMMARY

[0004] The utility model aims at the stator core structure of motor to carry out innovation improvement, provide a kind of stator core, stator core group, stator and its motor that can improve assembly efficiency, reduce motor weight, save time and material cost.

[0005] The technical scheme that the utility model solves its technical problem is as follows: the stator core of the utility model is integrally formed, and only one mold is needed for batch production and manufacturing;

[0006] The stator core of the utility model includes top surface, middle surface, base surface, side surface A group, side surface B group and inclined side surface group, the top surface is connected with the middle surface by side surface A group, side surface B group and inclined side surface group are adjacent, the middle surface is connected with the base surface by inclined side surface group and side surface B group in sequence, the area of the top surface on the cross section of the stator core is less than the area of the middle surface on the cross section, and the area of the middle surface on the cross section is less than the area of the base surface on the cross section;This structure ensures that the coil of motor passes through the top surface of stator core, is placed in the periphery of side surface A group while being blocked by the middle surface of stator core and / or inclined side surface group, so that the coil of motor does not move in stator core;

[0007] The utility model discloses a stator core's top surface, including short side, long side and the arc edge between short side and long side, short side includes first short side and second short side, first short side and second short side are parallel to each other, the length of first short side is greater than the length of second short side, long side includes first long side and second long side, the length of first long side is equal with the length of second long side, first short side connects first long side and second long side through arc edge, second short side connects first long side and second long side through arc edge, first short side, second short side, first long side, second long side and arc edge constitute the top surface outer periphery of stator core,

[0008] The utility model discloses a stator core's top surface still includes recess and convex part, recess is along the top surface and is inwards recessed, convex part is along the top surface and is outward convex, the distance of recess and convex part to short side is same, the size of recess is same with the size of convex part, namely the area formed by recess and inwards recess along the top surface is same with the area formed by convex part and outward convex along the top surface, can form a whole with two two motor stator core combination,

[0009] The utility model discloses a stator core's top surface sets up a group of recess and convex part, a group of recess and convex part are formed by a recess and a convex part.

[0010] The utility model discloses a stator core's top surface sets up two groups of recess and convex part, a group of recess and convex part are close to first short side setting, another group of recess and convex part are close to second short side setting.

[0011] The utility model discloses a stator core's top surface still can set up three groups of recess and convex part, a group of recess and convex part are close to first short side setting, a group of recess and convex part are close to second short side setting, and another group is located between other two groups of recess and convex part.

[0012] The utility model discloses a stator core's top surface sets up two groups of recess and convex part, a group of recess and convex part are close to first short side setting, another group of recess and convex part are close to second short side setting.

[0013] The utility model discloses a stator core's side A group is perpendicular with stator core's top surface and stator core's middle surface two respectively, side A group includes short side, long side and the arc surface between short side and long side, short side includes first short side and second short side, first short side one end is connected with the first short side of top surface, and the other end is connected with the middle surface, second short side one end is connected with the second short side of top surface, and the other end is connected with the middle surface, long side includes first long side and second long side, first long side one end is connected with the first long side of top surface, and the other end is connected with the middle surface, second long side one end is connected with the second long side of top surface, and the other end is connected with the middle surface,

[0014] The utility model discloses a stator core's middle surface shape is same with stator core's top surface, and stator core's middle surface includes middle surface short side, middle surface long side and the middle surface arc edge between middle surface short side and middle surface long side, middle surface short side includes third short side and fourth short side, third short side and fourth short side are parallel, and the length of third short side is greater than the length of fourth short side, middle surface long side includes third long side and fourth long side, and the length of third long side is equal with the length of fourth long side, and third short side connects third long side and fourth long side through middle surface arc edge, and fourth short side connects third long side and fourth long side through middle surface arc edge, and third short side, fourth short side, third long side, fourth long side and middle surface arc edge constitute the middle surface outer periphery of stator core,

[0015] The utility model discloses a stator core's middle surface third short side length is greater than first short side, and the length of fourth short side is greater than second short side,

[0016] The utility model discloses a stator core's base surface includes bottom surface short side, bottom surface long side and the bottom surface arc edge between bottom surface short side and bottom surface long side, bottom surface short side includes fifth short side and sixth short side, and the length of fifth short side is greater than the length of sixth short side, and fifth short side and sixth short side are curved to the same center of curvature, bottom surface long side includes fifth long side and sixth long side, and the length of fifth long side is equal with the length of sixth long side, and fifth short side connects fifth long side and sixth long side through bottom surface arc edge, and sixth short side connects fifth long side and sixth long side through bottom surface arc edge, and fifth short side, sixth short side, fifth long side, sixth long side and bottom surface arc edge constitute the base surface outer periphery of stator core,

[0017] The side surface B group of the stator core is perpendicular to the base surface of the stator core, the side surface B group comprises a short side surface B, a long side surface B and an arc surface B between the short side surface B and the long side surface B, the short side surface B comprises a third short side surface and a fourth short side surface, the third short side surface is connected with a fifth short side edge of the base surface, the fourth short side surface is connected with a sixth short side edge of the base surface, the long side surface B comprises a third long side surface and a fourth long side surface, the third long side surface is connected with a fifth long side edge of the base surface, the fourth long side surface is connected with a sixth long side edge of the base surface, the arc surface B is connected with a bottom surface arc edge of the base surface, the base surface of the stator core is mainly connected and fixed with the shell of the motor, and the side surface B group with a certain thickness is arranged to block the coil arranged at the side surface A group of the stator core, so that the coil is prevented from being connected with the shell of the motor.

[0018] The oblique side surface group of the stator core comprises a short oblique side surface, a long oblique side surface and an oblique arc surface between the short oblique side surface and the long oblique side surface, the short oblique side surface comprises a first short oblique side surface and a second short oblique side surface, one end of the first short oblique side surface is connected with a third short side edge of the middle surface, and the other end of the first short oblique side surface is connected with a third short side surface of the side surface B group; one end of the second short oblique side surface is connected with a fourth short side edge of the middle surface, and the other end of the second short oblique side surface is connected with a fourth short side surface of the side surface B group; the long oblique side surface comprises a first long oblique side surface and a second long oblique side surface, one end of the first long oblique side surface is connected with a third long side edge of the middle surface, and the other end of the first long oblique side surface is connected with a third long side surface of the side surface B group; one end of the second long oblique side surface is connected with a fourth long side edge of the middle surface, and the other end of the second long oblique side surface is connected with a fourth long side surface of the side surface B group; the base end structure of the stator core is strengthened, and the base of the stator core is prevented from being extruded and damaged.

[0019] The angle between the first long side edge and the second long side edge of the stator core is θ1, the angle between the third long side edge and the fourth long side edge is θ2, and the angle between the fifth long side edge and the sixth long side edge is θ3, wherein θ1=θ2, (θ3-θ1)<θ1≤θ3.

[0020] The stator core comprises a first stator core to an n-th stator core, wherein n is an even number, 2<n≤180; and the angle θ3 between the fifth long side edge and the sixth long side edge of the stator core is 360° / (n / 2).

[0021] The utility model discloses a recess is arranged on the stator core, and the recess extends along the base surface of the stator core to the inclined side surface group of the stator core, which can effectively dissipate heat for the stator core and the coil.

[0022] The utility model discloses a stator core further includes arc groove, the arc groove sets up between the middle surface of the stator core and the inclined side surface group of the stator core, the arc groove is cooperated with the end of stator core coil, makes the stator core of assembling process quick adaptation to the coil of suitable size, can prevent the coil and stator core friction contact when the motor is removed or is collided and leads to motor short circuit.

[0023] The utility model discloses a kind of stator core groups comprising two stator cores, one of which is set opposite to another after being inverted and inverted, forming a whole.

[0024] The utility model discloses a kind of stator core groups comprising coil and two stator cores, the coil includes single coil, one of which is set opposite to another after being inverted and inverted, inverted stator core is connected to the top surface of another stator core by passing through the single coil, forming a stable single stator core group.

[0025] The utility model discloses another kind of stator core groups comprising coil and four stator cores, the coil includes double coil, two of which are set opposite to another after being inverted and inverted, inverted two stator cores are connected to the top surface of another two stator cores by passing through double coil respectively, forming a stable double stator core group.

[0026] The utility model discloses the recess and the convex part of stator core correspond with the convex part and the recess of another stator core, i.e. the recess of stator core corresponds with the convex part of another stator core after being inverted, the convex part of stator core corresponds with the recess of another stator core after being inverted, so that two stator cores are combined to form a whole.

[0027] The bottom end outer periphery of the recess of the utility model stator core is set as arc angle, the top end outer periphery of the convex part of the utility model stator core is set as arc angle, which is convenient for the combination of recess and convex part, and also facilitates processing.

[0028] The utility model discloses coil, including single coil and double coil are all pre-wound coil, the shape of the inner circle of the pre-wound coil is same with the shape of the middle surface of the stator core and the top surface of the stator core, the area of the inner circle of the pre-wound coil is greater than the area of the top surface of the stator core, so that coil can be set on the stator core to realize motor winding.

[0029] The utility model discloses a stator includes a plurality of stator core group, a plurality of stator core group along the same center of a circle setting forms a whole.

[0030] The utility model discloses a plurality of stator core group includes single -turn coil and two stator core combination formed single stator core group, circle coil and four stator core combination formed double stator core group, three -turn coil and six stator core combination formed three stator core group.

[0031] The utility model discloses a stator includes a plurality of single -turn stator core group along the same center of a circle setting forms;

[0032] The utility model discloses a stator includes a plurality of double stator core group along the same center of a circle setting forms;

[0033] The utility model discloses a stator includes a plurality of three stator core group along the same center of a circle setting forms;

[0034] The utility model discloses a stator includes a plurality of single -turn stator core group and a plurality of double stator core group along the same center of a circle setting forms;

[0035] The utility model discloses a stator includes a plurality of single -turn stator core group and a plurality of three stator core group along the same center of a circle setting forms;

[0036] The utility model discloses a stator includes a plurality of three stator core group and a plurality of double stator core group along the same center of a circle setting forms.

[0037] The utility model discloses a motor includes the casing and stator, the casing is provided with the annular groove that cooperates with stator, stator fixed setting is to the annular groove in the casing.

[0038] The utility model discloses a stator includes a plurality of stator core group, a plurality of stator core group along the same center of a circle setting forms a whole. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is the structure schematic diagram of the utility model discloses a stator core left front direction;

[0040] Figure 2 It is the plan view of the utility model discloses a stator core;

[0041] Figure 3is the bottom view of the stator core of the utility model;

[0042] Figure 4 is the structure schematic diagram of the stator core with arc groove of the utility model;

[0043] Figure 5 is the structure schematic diagram of the stator core with two groups of concave parts and convex parts of the utility model from right rear direction;

[0044] Figure 6 is the schematic diagram of two stator cores before combination of the utility model;

[0045] Figure 7 is the schematic diagram of two stator cores after combination of the utility model;

[0046] Figure 8 is the structure schematic diagram of single circle coil of the utility model;

[0047] Figure 9 is the structure schematic diagram of single stator core group of the utility model;

[0048] Figure 10 is the structure schematic diagram of double circle coil of the utility model;

[0049] Figure 11 is the structure schematic diagram of double stator core group of the utility model;

[0050] Figure 12 is the section structure schematic diagram of concave part and convex part of the utility model;

[0051] Figure 13 is the structure schematic diagram of stator of the utility model.

[0052] In the drawing: 1-top surface, 2-middle surface, 3-base surface, 4-side surface A group, 5-side surface B group, 6-inclined side surface group, 13-arc edge, 14-concave part, 15-convex part, 23-middle surface arc edge, 33-bottom surface arc edge, 43-arc surface, 53-arc surface B, 63-inclined arc surface, 7-concave groove, 8-arc groove, 111-first short side edge, 112-second short side edge, 121-first long side edge, 122-second long side edge, 211-third short side edge, 212-fourth short side edge, 221-third long side edge, 222-fourth long side edge, 311-fifth short side edge, 312-sixth short side edge, 321-fifth long side edge, 322-sixth long side edge, 411-first short side surface, 412-second short side surface, 421-first long side surface, 422-second long side surface, 511-third short side surface, 512-fourth short side surface, 521-third long side surface, 522-fourth long side surface, 611-first short inclined side surface, 612-second short inclined side surface, 621-first long inclined side surface, 622-second long inclined side surface. DETAILED DESCRIPTION

[0053] The utility model will be further explained in detail in connection with the drawings and embodiments.

[0054] Embodiment 1, refer to Figure 1 The utility model discloses a kind of stator core, which comprises top surface, middle surface, base surface, side surface A group, side surface B group and oblique side surface group, the top surface is connected with the middle surface by side surface A group, side surface A group is perpendicular to the top surface of the stator core and the middle surface of the stator core respectively, side surface B group is adjacent to oblique side surface group, side surface B group is perpendicular to the base surface of the stator core, the middle surface is sequentially connected with the base surface by oblique side surface group and side surface B group, recess is provided on side surface B group, recess both ends extend to base surface and oblique side surface group respectively, a group of parallel recesses and convexes are provided on the top surface of the stator core in the direction close to recess, and the stator core structure is integrally formed using ferrite material.

[0055] Embodiment 2, refer to Figure 4 The utility model discloses a kind of stator core, which further includes arc slot, the arc slot is arranged between the middle surface of the stator core and the oblique side surface group of the stator core, and the arc slot is cooperated with the end of coil and is fixed;When two stator cores are combined with coil, coil is not prone to deformation, which effectively prevents the damage of stator core and coil;The rest is same as any one of other embodiments of the utility model or the combination of more than two embodiments.

[0056] Embodiment 3, refer to Figure 5 The utility model discloses a kind of stator core, the top surface of the stator core is provided with two groups of parallel recesses and convexes, one group of recesses and convexes is arranged in the top surface one end in the direction close to recess, another group of recesses and convexes is arranged in the top surface other end away from recess direction, and the arrangement mode of the two groups of recesses and convexes is opposite;The rest is same as any one of other embodiments of the utility model or the combination of more than two embodiments.

[0057] Embodiment 4, refer to Figure 6 The utility model discloses a kind of combination mode of stator core group, which includes two stator cores, with the midpoint of the first short side of the top surface of the stator core to the midpoint of the second short side as top surface center line, one of the stator cores is rotated or turned along the top surface center line, so that the top surface of the two stator cores corresponds to the top surface, the middle surface corresponds to the middle surface, the recess corresponds to the convex, and the two stator cores are connected to form a whole as shown in Figure 7 The rest is same as any one of other embodiments of the utility model or the combination of more than two embodiments.

[0058] Embodiment 5, refer to Figure 8The coil is pre-wound by an insulated copper wire or an aluminum wire, and both ends are reserved with connecting terminals, so that the adjacent preformed coils are conveniently connected. Figure 10 The rest is the same as any other embodiment or the combination of two or more embodiments of the utility model.

[0059] Embodiment 6, refer to Figure 12 The utility model discloses an eight slot stator, and the stator includes eight single stator core groups or four double stator core groups, the stator core group includes first stator core sixteenth stator core, the angle between the fifth long side and the sixth long side of stator core is 45 DEG, the angle between the first long side and the second long side of stator core can be designed as 45 DEG, the angle between the third long side and the fourth long side is 45 DEG, the rest is the same as any other embodiment or the combination of two or more embodiments of the utility model.

[0060] Embodiment 7, refer to Figure 12 The utility model discloses an eight slot stator, and the stator includes eight single stator core groups or four double stator core groups, the stator core group includes first stator core sixteenth stator core, the angle between the fifth long side and the sixth long side of stator core is 45 DEG, the angle between the first long side and the second long side of stator core is designed as 30 DEG less than the angle between the fifth long side and the sixth long side of stator core, the rest is the same as any other embodiment or the combination of two or more embodiments of the utility model.

[0061] Embodiment 8, refer to Figure 12 The utility model discloses an eighteen slot stator, and the stator includes eighteen single stator core groups or nine double stator core groups, the stator core group includes first stator core thirty sixth stator core, the angle between the fifth long side and the sixth long side of stator core is 20 DEG, the angle between the first long side and the second long side of stator core is designed as 20 DEG, the angle between the third long side and the fourth long side is 20 DEG, the rest is the same as any other embodiment or the combination of two or more embodiments of the utility model.

[0062] Embodiment 9, refer to Figure 12 The utility model discloses a thirty slot stator, and the stator includes thirty single stator core groups or fifteen double stator core groups, the stator core group includes first stator core sixtieth stator core, the angle between the fifth long side and the sixth long side of stator core is 12 DEG, the angle between the first long side and the second long side of stator core is designed as 12 DEG, the angle between the third long side and the fourth long side is 12 DEG, the rest is the same as any other embodiment or the combination of two or more embodiments of the utility model.

[0063] Embodiment 10, refer to Figure 12 The utility model discloses a kind of thirty-six slot stators, the stator includes thirty-six single stator core groups or eighteen double stator core groups, the stator core group includes first stator core-seventy-second stator core, the angle between the fifth long side and the sixth long side of the stator core is 10 °, the angle between the first long side and the second long side of the stator core is designed as 10 °, the angle between the third long side and the fourth long side is 10 °;Rest same as the combination of other any embodiment or more than two embodiments of the utility model.

[0064] Embodiment 11, refer to Figure 13 The utility model discloses a kind of forty slot stators, the stator includes forty single stator core groups or twenty double stator core groups, the stator core group includes first stator core-eightieth stator core, the angle between the fifth long side and the sixth long side of the stator core is 9 °, the angle between the first long side and the second long side of the stator core is designed as 9 °, the angle between the third long side and the fourth long side is 9 °;Rest same as the combination of other any embodiment or more than two embodiments of the utility model.

[0065] Embodiment 12, refer to Figure 13 The utility model discloses a kind of ninety slot stators, the stator includes ninety single stator core groups or forty-five double stator core groups, the stator core group includes first stator core-ninetieth stator core, the angle between the fifth long side and the sixth long side of the stator core is 4 °, the angle between the first long side and the second long side of the stator core is designed as 4 °, the angle between the third long side and the fourth long side is 4 °;Rest same as the combination of other any embodiment or more than two embodiments of the utility model.

[0066] The above will be combined with the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application are described clearly and completely, obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. The description of the following at least one exemplary embodiment is actually only illustrative, not as any limitation to the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of the present application.

[0067] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0068] It should be understood that the term "and / or" as used herein merely describes associated objects, and can exist in three forms: A and / or B, A or B, and A and B. In addition, the character " / " in this specification generally represents an "or" relationship between the front and rear associated objects.

[0069] The relative arrangement, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application, unless otherwise specifically stated. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are merely intended to facilitate the disclosure of the content disclosed in the specification for the understanding and reading of those skilled in the art, and are not intended to limit the defined conditions under which the present application can be implemented. Any modification of the structure, change of the proportional relationship, or adjustment of the size, which does not affect the effects and purposes that can be achieved by the present application, should still fall within the scope of the technology disclosed by the present application. The technology, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the technology, methods and devices should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0070] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and in the absence of contrary indications, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of the components themselves.

[0071] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical", "horizontal", and derivatives thereof shall relate to the application as oriented in the drawing figures. However, it is to be understood that the application can assume various alternative orientations and, accordingly, such terms are not to be taken as limitations of the present application or any application specifically disclosed herein.

[0072] In addition, it should be noted that the terms "first", "second", and so on, used to describe various components, are merely used to distinguish one component from another, and do not necessarily indicate the priority of one component over another, unless otherwise stated. Therefore, these terms should not be interpreted as limiting the scope of the present application.

Claims

1. A stator core characterized by: The stator core is integrally formed, and the stator core comprises a top surface, a middle surface, a base surface, a side surface A group, a side surface B group and an inclined side surface group, the top surface is connected with the middle surface through the side surface A group, the side surface B group and the inclined side surface group are adjacent, the middle surface is connected with the base surface through the inclined side surface group and the side surface B group in sequence, the area of the top surface on the cross section of the stator core is less than the area of the middle surface on the cross section, and the area of the middle surface on the cross section is less than the area of the base surface on the cross section; The top surface of the stator core comprises a short side, a long side and an arc side between the short side and the long side, the short side comprises a first short side and a second short side, the first short side and the second short side are parallel to each other, and the length of the first short side is greater than the length of the second short side; the long side comprises a first long side and a second long side, the length of the first long side is equal to the length of the second long side, the first short side connects the first long side and the second long side through the arc side, and the second short side connects the first long side and the second long side through the arc side; the first short side, the second short side, the first long side, the second long side and the arc side form the outer periphery of the top surface of the stator core; The top surface of the stator core further comprises a recess and a protrusion, the recess is recessed inward along the top surface, and the protrusion is protruded outward along the top surface, and the distance from the recess to the short side is the same as the distance from the protrusion to the short side; The side surface A group of the stator core is perpendicular to the top surface of the stator core and the middle surface of the stator core respectively, the side surface A group comprises a short side, a long side and an arc surface between the short side and the long side, the short side comprises a first short side and a second short side, one end of the first short side is connected with the first short side of the top surface, and the other end of the first short side is connected with the middle surface; one end of the second short side is connected with the second short side of the top surface, and the other end of the second short side is connected with the middle surface; the long side comprises a first long side and a second long side, one end of the first long side is connected with the first long side of the top surface, and the other end of the first long side is connected with the middle surface; one end of the second long side is connected with the second long side of the top surface, and the other end of the second long side is connected with the middle surface; The shape of the middle surface of the stator core is the same as that of the top surface of the stator core, the middle surface of the stator core comprises a middle surface short side, a middle surface long side and a middle surface arc side between the middle surface short side and the middle surface long side, the middle surface short side comprises a third short side and a fourth short side, the third short side is parallel to the fourth short side, the length of the third short side is greater than that of the fourth short side; the middle surface long side comprises a third long side and a fourth long side, the length of the third long side is equal to that of the fourth long side, the third short side connects the third long side and the fourth long side through the middle surface arc side, the fourth short side connects the third long side and the fourth long side through the middle surface arc side, and the third short side, the fourth short side, the third long side, the fourth long side and the middle surface arc side constitute the outer periphery of the middle surface of the stator core; The base surface of the stator core comprises a bottom surface short side, a bottom surface long side and a bottom surface arc side between the bottom surface short side and the bottom surface long side, the bottom surface short side comprises a fifth short side and a sixth short side, the length of the fifth short side is greater than that of the sixth short side, the fifth short side and the sixth short side are curved in an arc shape and curve towards the same center; the bottom surface long side comprises a fifth long side and a sixth long side, the length of the fifth long side is equal to that of the sixth long side, the fifth short side connects the fifth long side and the sixth long side through the bottom surface arc side, the sixth short side connects the fifth long side and the sixth long side through the bottom surface arc side, and the fifth short side, the sixth short side, the fifth long side, the sixth long side and the bottom surface arc side constitute the outer periphery of the base surface of the stator core; The side surface B group of the stator core is perpendicular to the base surface of the stator core, the side surface B group comprises a short side surface B, a long side surface B and an arc surface B between the short side surface B and the long side surface B, the short side surface B comprises a third short side surface and a fourth short side surface, the third short side surface is connected with the fifth short side of the base surface; The fourth short side surface is connected with the sixth short side of the base surface; the long side surface B comprises a third long side surface and a fourth long side surface, the third long side surface is connected with the fifth long side of the base surface; the fourth long side surface is connected with the sixth long side of the base surface; and the arc surface B is connected with the bottom surface arc side of the base surface. The oblique side group of the stator core comprises short oblique sides, long oblique sides and oblique arcs between the short oblique sides and the long oblique sides, the short oblique sides comprise first short oblique sides and second short oblique sides, one end of the first short oblique side is connected with the third short side of the middle surface, the other end of the first short oblique side is connected with the third short side of the side group B; one end of the second short oblique side is connected with the fourth short side of the middle surface, the other end of the second short oblique side is connected with the fourth short side of the side group B; the long oblique sides comprise first long oblique sides and second long oblique sides, one end of the first long oblique side is connected with the third long side of the middle surface, the other end of the first long oblique side is connected with the third long side of the side group B; one end of the second long oblique side is connected with the fourth long side of the middle surface, the other end of the second long oblique side is connected with the fourth long side of the side group B; The angle between the first long side and the second long side of the stator core is θ1, the angle between the third long side and the fourth long side is θ2, and the angle between the fifth long side and the sixth long side is θ3, wherein θ1 = θ2, (θ3- θ1) < θ1 ≤ θ3.

2. The stator core of claim 1, characterized by: The stator core comprises the first stator core to the n-th stator core, wherein n is an even number, 2 < n ≤ 180; the angle θ3 between the fifth long side and the sixth long side of the stator core is 360° / (n / 2).

3. The stator core according to claim 1 or 2, characterized by: The stator core is further provided with a groove, the groove extends from the base surface of the stator core to the oblique side group of the stator core.

4. The stator core of claim 3, characterized by: The stator core further comprises an arc groove, which is arranged between the middle surface of the stator core and the oblique side group of the stator core.

5. A stator core set characterized by: The stator core comprises a coil and two stator cores as claimed in any one of claims 1 to 4, the coil comprises a single-coil, wherein one stator core is connected to the top surface of another stator core through the single-coil.

6. The stator core pack of claim 5, characterized by: The recess and the protrusion of the stator core correspond to the protrusion and the recess of another stator core.

7. The stator core pack of claim 5, characterized by: The coil is a pre-wound coil.

8. A stator core pack characterized by: The stator core comprises a coil and four stator cores as claimed in any one of claims 1 to 4, the coil comprises a double-coil, wherein two stator cores are connected to the top surfaces of another two stator cores through the double-coil respectively.

9. A stator characterized by: The stator core comprises a plurality of stator core groups as claimed in claim 5, the plurality of stator core groups are arranged around the same center to form a whole.

10. An electric machine characterized by: The stator comprises a shell and the stator as claimed in claim 9, the stator is arranged in the shell.

Images