A stator core and a stator

Abstract

The present invention discloses a stator core and a stator to solve the problems that the opening angle of the articulated connection of the existing chain-type stator core is limited, wire winding is prone to interference, and there are gaps at the two arc edges during the stator forming process, resulting in a decrease in the core strength. A stator core of the present invention includes a plurality of stator core units. Any of the stator core units includes a stator yoke portion and a stator tooth portion. The stator tooth portion is connected to the stator yoke portion. The stator yokes on the plurality of stator core units are articulated at the head and tail through a hinge shaft to form a chain structure. The head and tail of the chain structure are fixed together to form the stator core. The hinge shaft has a first hinge position and a second hinge position. The hinge shaft on the stator core unit of the present invention has a first hinge position and a second hinge position, which can increase the rotation angle of adjacent two stator core units, avoid interference during wire winding, and at the same time, the hinge shaft is at the first hinge position during stator forming.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator core and a stator. Background Art

[0002] The traditional chain-type motor stator core is successively and hingedly connected through stator core units to form a chain structure. Each stator core unit is formed by laminating a plurality of stator core laminations. The purpose of adopting this structure is to facilitate winding. After winding is completed on all the tooth parts of the stator core unit, the two ends of the chain structure are fixed to form the stator core. As Figure 1 and Figure 2 shown, in order to ensure the performance of the stator core, one end of the stator core unit where the hinges abut against each other is provided with an arc edge. When two adjacent stator core units rotate, the arc edges A1 and A2 cooperate with each other to limit the rotation angle of the core. The arc edges A1 and A2 adopt a design structure that is non-concentric with the hinge shaft 20. The opening angle of this structure is limited. Affected by processing and manufacturing deviations, it is easy to cause interference between the winding nozzle and the adjacent tooth parts during the winding process, and there will be a gap between two adjacent punching sheets during the stator forming process, resulting in a decrease in the strength of the stator core. Summary of the Invention

[0003] In view of this, the present invention discloses a stator core and a stator to solve the problems of limited opening angle of the hinge of the existing chain-type stator core and easy interference during winding.

[0004] The technical solution adopted by the present invention to achieve the above object is:

[0005] The first aspect of the present invention discloses a stator core, including a plurality of stator core units. Any of the stator core units includes a stator yoke portion and a stator tooth portion. The stator tooth portion is connected to the stator yoke portion. The stator yoke portions on the plurality of stator core units are successively connected in series through a hinge shaft to form a chain structure. The two ends of the chain structure are fixed together to form the stator core. The stator yoke portion has a first hinge position and a second hinge position. When the hinge shaft is located at the first hinge position, two adjacent stator core units have a first rotation angle A. When the hinge shaft is located at the second hinge position, two adjacent stator core units have a second rotation angle B. When two adjacent stator core units rotate by the first rotation angle A, the hinge shaft can move from the first hinge position to the second hinge position. The maximum rotation angle of two adjacent stator core units satisfies: max(A, B) < C ≤ A + B, where A is the first rotation angle A, B is the second rotation angle B, and C is the maximum rotation angle of two adjacent stator core units.

[0006] Further, the stator core unit is formed by laminating two rows of staggered stator core laminations, and a plugging protrusion and a plugging groove are respectively formed on both sides of the stator core lamination. The plugging protrusion on any stator core unit is plugged together with the plugging groove on its adjacent stator core unit;

[0007] A hinge shaft is fixedly provided on the plugging protrusion on one side of the stator core unit, and a track groove is provided on the plugging protrusion on the other side thereof;

[0008] The hinge shaft is movably arranged in the track groove, and the track groove has the first hinge position and the second hinge position.

[0009] Further, a long groove and an arc groove with the same extending direction are provided on the plugging protrusion on the other side. The long groove and the arc groove intersect to form the track groove. A through port is formed at the intersection position of the long groove and the arc groove. The hinge shaft is in the arc groove as the first hinge position, and the hinge shaft moves into the long groove as the second hinge position. The hinge shaft can pass through the through port and enter the second hinge position.

[0010] Further, when the relative rotation angle between two adjacent stator core units is less than the first rotation angle A, the hinge shaft can only rotate in the arc groove;

[0011] When two adjacent stator core units rotate relative to each other to the first rotation angle A, the hinge shaft can move from the arc groove to the long groove.

[0012] Further, the outer peripheral edge shape of any stator core lamination in the two rows is arc-shaped. Both ends of any stator core lamination in the two rows are connected to the outer peripheral edge of the stator core lamination itself through arc edges. One of the arc edges is an outward convex arc edge, and the other arc edge is an inward concave arc edge;

[0013] The hinge shaft is fixedly provided at the center of the outward convex arc edge on any stator core lamination in one row;

[0014] The track groove is provided at the center position of the inward concave arc edge on any stator core lamination in the other row;

[0015] When the two rows of stator core laminations are laminated in a staggered manner to form a stator core unit, the hinge shafts are located on the same side, and the track grooves are located on the other side opposite to the hinge shafts;

[0016] The outward convex arc edge on one stator core unit on the same plane rotates and mates with the inward concave arc edge on another adjacent stator core unit.

[0017] Further, when the hinge shaft is located at the first hinge position, the inner concave arc edge is concentric with the outer convex arc edge that rotates in cooperation with it.

[0018] Further, the shaft section of the hinge shaft located in the track groove portion is provided with a cutting surface parallel to its own axis. When two adjacent stator core units rotate to the first rotation angle A, the cutting surface faces the side wall of the through port, and the hinge shaft can move into the long groove. When the hinge shaft is in the long groove, the hinge shaft moves along the length direction of the long groove, increasing the distance between the inner concave arc edge and the outer convex arc edge that rotates in cooperation with it.

[0019] Further, the sum of the distance from the cutting surface to the axis of the hinge shaft and the radius of the hinge shaft is less than the width of the through port, the diameter of the hinge shaft is greater than the width of the through port, and the central angle of the arc groove is greater than π.

[0020] Further, when two adjacent stator core units are formed into the stator core, the edges of two adjacent stator core laminations on the same plane abut against each other;

[0021] When the ends of two adjacent stator yokes rotate from the abutting state to the maximum angle through the hinge shaft, the end of the stator tooth portion on one of the stator core units crosses the root of the stator tooth portion on the other stator core unit.

[0022] A second aspect of the present invention discloses a stator, including the stator core described in the first aspect. The stator tooth portions of the stator core are evenly distributed along the circumferential direction of the stator core, and tooth grooves are formed between two adjacent stator tooth portions. A coil is wound on any one of the stator tooth portions and filled in the tooth groove.

[0023] Beneficial effects: The hinge shaft of the present invention has a first hinge position and a second hinge position. During winding, after the hinge shaft is unfolded by a certain angle from the first hinge position, the hinge shaft passes through the second hinge position, increasing the rotation gap between two adjacent yokes, and further increasing the rotation angle, so that there is no interference during the winding of the stator tooth portion; at the same time, when the stator is formed, moving from the second hinge position to the first hinge position, two adjacent yokes return to the initial position to form the stator core. The fact that the hinge shaft cannot move to the second hinge position limits the movement of the hinge shaft, ensuring the strength and connection reliability of the stator core. Description of the Drawings

[0024] By describing its exemplary embodiments in detail with reference to the accompanying drawings, the above and other objects, features, and advantages of the present disclosure will become more apparent. The following described drawings are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0025] Figure 1 It shows a schematic diagram of the closed state when two stator core units are hinged in the prior art;

[0026] Figure 2 It shows a schematic diagram of the unfolded state when two stator core units are hinged in the prior art;

[0027] Figure 3 It shows a schematic diagram of some stator core units being hinged to each other in Embodiment 1;

[0028] Figure 4 It shows a schematic diagram of the stator core laminations in Embodiment 1;

[0029] Figure 5 It shows a partial cross-sectional view of the first stacking structure of the stator core units in Embodiment 1;

[0030] Figure 6 It shows a partial cross-sectional view of the second stacking structure of the stator core units in Embodiment 1;

[0031] Figure 7 It shows a partial cross-sectional view of the third stacking structure of the stator core units in Embodiment 1;

[0032] Figure 8 It shows that in Embodiment 1, the stator core units are hinged according to the Figure 5 stacking structure in the partial cross-sectional view;

[0033] Figure 9 It shows that in Embodiment 1, the stator core units are hinged according to the Figure 7 stacking structure in the partial cross-sectional view;

[0034] Figure 10 It shows a partial view of the closed state when two adjacent stator core units are hinged in Embodiment 1;

[0035] Figure 11 It shows a partial view of the state when two adjacent stator core units are hinged at the first rotation angle A in Embodiment 1;

[0036] Figure 12 It shows a schematic diagram of the hinge axis moving into the long slot when two adjacent stator core units are hinged in Embodiment 1;

[0037] Figure 13Shows a schematic diagram of the hinge axis moving to the second hinge position in the long groove when two adjacent stator core units are hinged in Embodiment 1;

[0038] Figure 14 Shows Figures 10 - 13 Partial enlarged views of the track grooves in each view;

[0039] Figure 15 Shows a schematic diagram of two adjacent stator core units at the maximum opening angle;

[0040] Figure 16 Shows a schematic diagram of the stator core in Embodiment 1 and Embodiment 2. Detailed implementation manners

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the", and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. "Multiple" generally includes at least two, but does not exclude the case of including at least one.

[0043] It should be understood that the term "and / or" used herein is only a description of the associated relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0044] It should also be noted that the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such commodity or system. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0045] The existing stator core units are hinged by a hinge shaft, and the rotation angle between two adjacent stator core units is defined by an arc edge. In order to increase the opening angle, the arc edge and the hinge shaft are arranged in a non-concentric manner. However, the opening angle of this structure is limited. After the stator is formed, affected by the machining and manufacturing precision, when the stator is formed, due to the non-concentric design of the arc edge, gaps are likely to occur, resulting in a decrease in the strength of the stator. The present invention adjusts the gap between the two arc edges of the two stator core units by means of a movable hinge shaft. During winding, after one of the stator core units rotates a certain angle, the hinge shaft moves to another hinge position, increasing the gap between the two arc edges, thereby increasing the opening angle between the two stator core units and avoiding winding interference. At the same time, when the stator core is formed, the hinge shaft cannot move to the second hinge position when it rotates less than the first rotation angle A at the first hinge position, ensuring the tightness of the connection between the hinge shaft and the stator core unit and preventing the hinge shaft from loosening and reducing the connection strength between two adjacent stator core units.

[0046] To further elaborate on the technical solutions in the present invention, in combination with Figures 3 - 11 , the following specific embodiments are provided.

[0047] Embodiment 1

[0048] In this embodiment, a stator core is provided. As shown in Figure 3 and Figures 10 - 13 , it includes a plurality of stator core units 10. Any one of the stator core units 10 includes a stator yoke portion 11 and a stator tooth portion 12. The stator tooth portion 12 is connected to the stator yoke portion 11. The stator yoke portions 11 on the plurality of stator core units 10 are sequentially connected in series by a hinge shaft 20 to form a chain structure. The two ends of the chain structure are fixed together to form the stator core. The stator yoke portion 11 has a first hinge position and a second hinge position. When the hinge shaft 20 is located at the first hinge position, two adjacent stator core units 10 have a first rotation angle A. When the hinge shaft 20 is located at the second hinge position, two adjacent stator core units 10 have a second rotation angle B. When two adjacent stator core units 10 rotate the first rotation angle A, the hinge shaft 20 can move from the first hinge position to the second hinge position. The maximum rotation angle of two adjacent stator core units satisfies: max(A, B) < C ≤ A + B, where A is the first rotation angle A, B is the second rotation angle B, and C is the maximum rotation angle of two adjacent stator core units.

[0049] As an implementation manner of this embodiment, the two ends of the chain structure can be fixed by welding, or through holes can be opened on the side of the stator yoke portion 11 and fixed by a pin shaft, or can be fixed by a clamping method.

[0050] As a preferred embodiment of this embodiment, as Figure 5 shown, the stator core unit 10 is formed by laminating two rows of staggered stator core laminations 13, and a plugging protrusion 131 and a plugging groove 132 are respectively formed on both sides of the stator core lamination 13. The plugging protrusion 131 on any stator core unit 10 is correspondingly plugged with the plugging groove 132 on its adjacent stator core unit 10; a hinge shaft 20 is fixedly provided on the plugging protrusion 131 on one side of the stator core unit 10, and a track groove c is provided on the plugging protrusion 131 on the other side thereof; the hinge shaft 20 is movably arranged in the track groove c, and the track groove c has the first hinge position and the second hinge position.

[0051] As a preferred embodiment of this embodiment, as Figure 14 shown, the plugging protrusion 131 on the other side is provided with a long groove c1 and an arc groove c2 with the same extending direction. The long groove c1 and the arc groove c2 intersect and communicate to form the track groove c. The arc groove c2 forms a through port at the intersection position of the long groove c1. The hinge shaft 20 is in the arc groove c2 as the first hinge position, and the hinge shaft 20 moves into the long groove c1 as the second hinge position. The hinge shaft 20 can enter the second hinge position through the through port.

[0052] As a preferred embodiment of this embodiment, when the relative rotation angle between two adjacent stator core units 10 is less than the first rotation angle A, the hinge shaft 20 can only rotate in the arc groove c2; when two adjacent stator core units 10 rotate relative to each other to the first rotation angle A, the hinge shaft 20 can move from the arc groove c2 to the long groove c1.

[0053] As Figure 4As shown (only a schematic diagram of a stator core lamination 13 is shown in the figure), the outer peripheral edge shape of any of the two columns of the stator core lamination 13 is an arc shape, and the two end edges B2 and B3 of any of the two columns of the stator core lamination 13 are connected to the outer peripheral edge B1 of the stator core lamination 13 itself through an arc edge, wherein the arc edge at one end is an outer convex arc edge A1, and the arc edge at the other end is an inner concave arc edge A2; the center of the outer convex arc edge A1 on any of the stator core laminations 13 in one column is fixed The hinge shaft 20 is provided; the track groove c is provided at the center position of the concave arc edge A2 on any stator core lamination 13 in the other row; when the two rows of stator core laminations 13 are staggered and stacked to form the stator core unit 10, the hinge shaft 20 is located on the same side, and the track groove c is located on the other side opposite to the hinge shaft 20; the convex arc edge A1 on one stator core unit 10 and the concave arc edge A2 on another adjacent stator core unit 10 on the same plane are rotatably matched with each other.

[0054] In order to solve the problem in the prior art that a gap is easily formed between the two arc edges during the stator forming process, which causes a decrease in the strength of the core, as a preferred implementation method of this embodiment, when the hinge shaft 20 is located at the first hinge position, the concave arc edge A2 is concentrically arranged with the convex arc edge A1 which rotates with it, so as to avoid eccentricity between the arc edge and the hinge shaft 20, and no gap will appear during the forming of the stator core to cause a decrease in strength, so that the stator core laminations 13 will become loose, affecting the performance of the stator core and increasing the loss of the stator core.

[0055] As an implementation mode of this embodiment, when the hinge shaft 20 is at the first hinged position, there is a clearance fit between the hinge shaft 20 and the circular arc groove c2.

[0056] As an implementation method of this embodiment, Figure 5 As shown, the stator core unit 10 is formed by stacking a plurality of stator core laminations 13 interlaced together, two adjacent stator core laminations 13 are interlaced and stacked, and a plug-in protrusion 131 and a plug-in groove 132 are formed at both ends of the stator core laminations 13. Figure 7 The stator core unit 10 is formed by staggered stacking of multiple groups of stator core laminations 13 arranged side by side, and a plug-in protrusion 131 and a plug-in groove 132 are formed on both sides of the stator core laminations 13. Figure 6 and Figure 7 As shown, the hinge shaft 20 can be a shaft that passes through multiple stator core laminations 13 and is fixed to the stator core laminations, or it can be multiple short shafts fixed on the stator core laminations 13, and the multiple short shafts are coaxially arranged. Figure 8 Is adoptedFigure 5 A partial cross-sectional view of the articulation of two adjacent stator core units 10 when two adjacent stator core laminations 13 are staggered and stacked to form a stator core unit 10. In this figure, an upper stator core lamination 13 in the same stator core unit 10 is articulated with a corresponding lower stator core lamination 13 in its adjacent stator core unit 10, wherein an articulation shaft 20 is fixedly provided on the upper stator core lamination 13, and a track groove c is provided on the lower stator core lamination 13, and the articulation shaft 20 extends into the track groove c. Figure 9 Is adopted Figure 7 When a stator core unit 10 is formed by staggered stacking of multiple groups of stator core laminations 13 arranged side by side, a partial cross-sectional view of two adjacent stator core units 10 being hinged, in which Figure 8 The difference is that the structure of the hinge shaft 20 is different, and the hinge shaft 20 is arranged through the track groove c.

[0057] In order to allow the hinge shaft 20 to pass through the passage, preferably, the shaft section of the hinge shaft 20 located in the track groove c is provided with a cutting surface 21 parallel to its own axis. When the two adjacent stator core units 10 rotate to the first rotation angle A, the cutting surface 21 faces the side wall of the passage, and the hinge shaft 20 can move into the long groove c1. When the hinge shaft 20 is in the long groove c1, the hinge shaft 20 moves along the length direction of the long groove c1, so that the distance between the inner concave arc edge A2 and the outer convex arc edge A1 that rotates with it increases. Specifically, as Figure 14 As shown, the sum of the axial distance from the cutting surface 21 to the hinge shaft 20 and the radius of the hinge shaft 20 L1 is smaller than the width L2 of the through hole, and the radius r1 of the hinge shaft 20 is larger than the width L2 of the through hole, that is, r1 <L1<L2,所述圆弧槽的圆心角大于π,通过对所述铰接轴20尺寸限定,可保证铰接轴20转动到所述第一转角A时能从所述圆弧槽c2移动到所述长槽c1内。

[0058] As an implementation method of this embodiment, Figure 4 and Figure 5As shown in the figure, any one of the two columns of the stator core laminations 13 is composed of a stator yoke unit 133 and a stator tooth unit 134. The stator tooth unit 134 extends from the middle of the stator yoke unit 133 to form an integral structure. One side edge of the stator yoke unit 133 opposite to the stator tooth unit 134 is an arc-shaped outer peripheral edge B1. The two end edges B2 and B3 of the stator yoke unit 133 serve as the abutting ends of two adjacent stator core units 10. One end edge B2 is connected to the arc-shaped outer peripheral edge B1 through the convex arc edge A1, and one end edge B2 and the arc-shaped outer peripheral edge B1 can be tangent to the convex arc edge A1; the other end edge B3 is tangent to the concave arc edge A2, and the concave arc edge A2 intersects with the arc-shaped outer peripheral edge B1. As Figure 5 shown, the hinge shaft 20 is fixedly provided at the center of the convex arc edge A1 of the same column. The hinge shaft 20 is perpendicular to the stator core lamination 13. A track groove c is provided at the center position of the convex arc edge A1 of the other column. The track groove c and the hinge shaft 20 are arranged on both sides of the stator core unit 10.

[0059] As an implementation manner of this embodiment, as Figure 5 shown, a trapezoidal groove e1 is provided on one side surface of the stator yoke unit 133, and a trapezoidal protrusion e2 corresponding to the position of the trapezoidal groove e1 is provided on the other side surface. When a plurality of staggered stator core laminations 13 are stacked on each other, the trapezoidal protrusion e2 on one stator core lamination 13 corresponds to the adjacent trapezoidal groove e1, and they are buckled together by stacking to form the stator core unit 10.

[0060] As Figure 10 shown, it is a partial schematic diagram of two adjacent stator core units 10 when they are in the closed and unfolded state. When the hinge shaft 20 does not rotate, since the radius r1 of the hinge shaft 20 is smaller than the size of the through port L2, the cutting surface 21 on it does not face the side wall of the through port L2 when the hinge shaft 20 does not rotate; when the hinge shaft 20 rotates to the first rotation angle A in the arc groove c2, as Figure 11 shown, the cutting surface 21 faces the side wall of the through port L2, and the passing dimension of the hinge shaft 20 in the through port changes to L1. Since L1 is smaller than the width L2 of the through port, by moving the stator core unit 10, the hinge shaft 20 can be moved into the long groove c1, as Figure 12 shown, the hinge shaft 20 moves from the arc groove c2 to the long groove, that is, from Figure 11 position to Figure 12 position. The moving direction of the hinge shaft 20 can be along Figure 11move circumferentially along the circular outer peripheral edge B1 outside the stator core unit 10 on the right side in 12, and stagger the convex circular arc edge A1 and the concave circular arc edge A2 from each other; when the hinge shaft 20 moves along the length direction of the long slot c1 in the long slot c1, that is, from Figure 12 the position shown to Figure 13 the position shown, the hinge shaft 20 will finally move to the end of the long slot c1, and the moving direction of the hinge shaft 20 can be along Figure 12 or Figure 13 move circumferentially along the circular outer peripheral edge B1 outside the stator core unit 10 on the left side in, and the adjacent two stator core units 10 can continue to rotate by a second angle B on the basis of the first angle A. At this time, the position of the long slot c1 where the hinge shaft 20 is located is used as the second hinge position. When the adjacent two stator core units 10 rotate to the maximum angle, as Figure 15 shown, when the ends of the adjacent two stator yokes 11 rotate to the maximum angle from the state of abutting against each other through the hinge shaft 20, the end of the stator tooth portion 12 on one of the stator core units 10 crosses the root of the stator tooth portion 12 on the other stator core unit 10, and the end of the stator tooth portion 12 and the root of the stator tooth portion 12 on the other stator core unit 10 are arranged at an interval L, so as to ensure that there is no interference in the winding of the stator core unit 10 on the stator tooth portion 12.

[0061] Embodiment 2

[0062] This embodiment provides a stator, as Figure 16 shown, including the stator core described in Embodiment 1. The stator tooth portions 12 of the stator core are evenly distributed along the circumferential direction of the stator core. Tooth grooves a are formed between adjacent two stator tooth portions 12, and coils are wound on any one of the stator tooth portions 12 and filled in the tooth grooves a.

[0063] The specific exemplary embodiments of the present disclosure have been shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, setting manners or implementation methods described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent settings included within the spirit and scope of the appended claims.

Claims

1. A stator core includes a plurality of stator core units. Any one of the stator core units includes a stator yoke portion and a stator tooth portion. The stator tooth portion is connected to the stator yoke portion. The stator yoke portions on the plurality of stator core units are sequentially connected in series by a hinge shaft to form a chain structure. The head and tail ends of the chain structure are fixed together to form the stator core, characterized in that The stator yoke has a first hinged position and a second hinged position; The stator core unit is formed by laminating two rows of staggered stator core laminations, and a plugging protrusion and a plugging groove are respectively formed on both sides of the stator core lamination. The plugging protrusion on any stator core unit is correspondingly plugged with the plugging groove on its adjacent stator core unit; A hinge shaft is fixedly provided on the plugging protrusion on one side of the stator core unit, and a track groove is provided on the plugging protrusion on the other side thereof; The hinge shaft is movably arranged in the track groove, and the track groove has the first hinged position and the second hinged position; When the hinge shaft is located at the first hinged position, two adjacent stator core units have a first rotation angle A; When the hinge shaft is located at the second hinged position, two adjacent stator core units have a second rotation angle B; When two adjacent stator core units rotate by the first rotation angle A, the hinge shaft can move from the first hinged position to the second hinged position; The maximum rotation angle of two adjacent stator core units satisfies: max(A, B) < C ≤ A + B, where C is the maximum rotation angle of two adjacent stator core units; The plugging protrusion on the other side is provided with a long groove and an arc groove with the same extending direction. The long groove and the arc groove intersect and penetrate to form the track groove. The arc groove forms a through port at the intersection position of the long groove. The hinge shaft is located in the arc groove as the first hinged position, and the hinge shaft moves into the long groove as the second hinged position. The hinge shaft can pass through the through port and enter the second hinged position.

2. A stator core according to claim 1, characterized in that, When the relative rotation angle of two adjacent stator core units is less than the first rotation angle A, the hinge shaft can only rotate in the arc groove; When two adjacent stator core units rotate relative to the first rotation angle A, the hinge shaft can move from the arc groove to the long groove.

3. A stator core according to claim 1, characterized in that, The outer peripheral edge shape of any stator core lamination in the two rows is arc-shaped, and both ends of any stator core lamination in the two rows are connected to the outer peripheral edge of the stator core lamination itself through arc edges. One of the arc edges is an outward convex arc edge, and the other arc edge is an inward concave arc edge; The hinge shaft is fixedly provided at the center of the outward convex arc edge on any stator core lamination in one row; The track groove is provided at the center position of the inward concave arc edge on any stator core lamination in the other row; When the two rows of stator core laminations are laminated in a staggered manner to form a stator core unit, the hinge shafts are located on the same side, and the track grooves are located on the other side opposite to the hinge shafts; The outward convex arc edge on one stator core unit on the same plane is rotationally matched with the inward concave arc edge on another adjacent stator core unit; 4. A stator core according to claim 3, characterized in that, When the hinge shaft is located at the first hinged position, the inward concave arc edge and the outward convex arc edge rotationally matched with it are concentrically arranged.

5. A stator core according to claim 4, characterized in that, The shaft section of the hinge shaft located in the track groove portion is provided with a cutting surface parallel to its own axis. When two adjacent stator core units rotate to the first rotation angle A, the cutting surface faces the side wall of the through port, and the hinge shaft can move into the long groove. When the hinge shaft is in the long groove, the hinge shaft moves along the length direction of the long groove, so that the distance between the inner concave arc edge and the outer convex arc edge that rotates and cooperates with it increases.

6. A stator core as claimed in claim 5, wherein, The sum of the distance from the cutting surface to the axis of the hinge shaft and the radius of the hinge shaft is less than the width of the through port, and the diameter of the hinge shaft is greater than the width of the through port, and the central angle of the arc groove is greater than .

7. A stator core according to any one of claims 1-6, characterized in that, When two adjacent stator core units are formed into the stator core, the edges of two adjacent stator core laminations on the same plane abut against each other; When the ends of two adjacent stator yoke portions rotate to the maximum angle through the hinge shaft from the state of abutting against each other, the end of the stator tooth portion on one of the stator core units crosses the root of the stator tooth portion on the other stator core unit.

8. A stator, characterized in that, Including the stator core according to any one of claims 1-7, the stator tooth portions of the stator core are evenly distributed along the circumferential direction of the stator core, tooth grooves are formed between two adjacent stator tooth portions, and coils are wound on any one of the stator tooth portions and filled in the tooth grooves.

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