Double-sided skewed slot stator, preparation method thereof, and axial motor applying double-sided skewed slot stator

Abstract

The invention relates to the technical field of motors, and discloses a double-sided skewed slot stator, a preparation method thereof and an axial motor applying the double-sided skewed slot stator, and the double-sided skewed slot stator comprises a stator core which is provided with a first skewed slot and a second skewed slot; the first skewed slots are axially projected on the second end face, the intersection point of the projection of one second skewed slot and the projection of the first skewed slot is located on the inner circumference of the stator iron core, and the intersection point of the projection of the other second skewed slot and the projection of the first skewed slot is located on the outer circumference of the stator iron core; the winding coil and the first inclined section conductor are arranged in the first inclined groove, the second inclined section conductor is arranged in the second inclined groove, and the connecting section conductor is attached to the inner circumferential surface and the outer circumferential surface of the stator iron core and extends in the axial direction. According to the invention, the end part and the space of the stator winding can be reduced as much as possible, even the circumferential connecting section is eliminated, the coil material and the cost of the winding are saved, the heating temperatures of different positions of the stator winding are more uniform, the cooling design of the stator is simplified, and the axial motor meets the design requirements of high power, large torque and small volume.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a double-sided skew slot stator and a preparation method thereof and an axial motor using the same. Background Art

[0002] In a motor, the end of the stator winding is usually an indispensable part of the stator winding. The winding end can be used to turn the current, and the conductors entering and leaving the core belong to different poles, thereby generating a constant torque and realizing the conversion between electrical energy and mechanical energy. However, as a part that does not generate torque, the winding end will take up extra material and space, and the winding end is not easy to cool, which complicates the insulation and cooling design, thereby restricting the rated output power. Summary of the invention

[0003] In view of this, the present invention provides a double-sided bevel slot stator, a preparation method thereof, and an axial motor using the same, so as to solve the problem in the prior art that the stator winding ends occupy extra materials and space, and the winding ends are not easy to cool, which complicates the insulation and cooling design, thereby restricting the rated output power.

[0004] In a first aspect, the present invention provides a double-sided skewed slot stator, comprising: a stator core, wherein the stator core is respectively formed with a first end face and a second end face at two axial ends, a first skewed slot is provided on the first end face, and a plurality of the first skewed slots are provided at intervals along the circumference of the first end face, a second skewed slot is provided on the second end face, and a plurality of the second skewed slots are provided at intervals along the circumference of the second end face, the first skewed slot and the second skewed slot are both inclined relative to the radial direction of the stator core and have opposite inclination directions; the first skewed slot is projected onto the second end face along the axial direction, and there is a The intersection of the second inclined slot and the projection of the first inclined slot is located on the inner circumference of the stator core, and there is another intersection of the second inclined slot and the projection of the first inclined slot is located on the outer circumference of the stator core; at least one winding coil includes a first inclined segment conductor, a second inclined segment conductor and a connecting segment conductor, the first inclined segment conductor is arranged in the first inclined slot, the second inclined segment conductor is arranged in the second inclined slot, the connecting segment conductor connects the first inclined segment conductor and the second inclined segment conductor, and the connecting segment conductor is attached to the inner circumference and outer circumference of the stator core and extends along the axial direction.

[0005] In an optional embodiment, the connecting segment conductor includes an inner connecting segment and an outer connecting segment; the inner connecting segment is attached to the inner circumference of the stator core and extends axially, and the inner connecting segment connects the ends of the first oblique segment conductor and the second oblique segment conductor located on the inner circumference of the stator core; the outer connecting segment is attached to the outer circumference of the stator core and extends axially, and the outer connecting segment connects the ends of the first oblique segment conductor and the second oblique segment conductor located on the outer circumference of the stator core.

[0006] In a second aspect, the present invention further provides a method for preparing a double-sided skewed slot stator, which is used to prepare the double-sided skewed slot stator, comprising the steps of:

[0007] The first side edge and the second side edge are respectively formed on opposite sides of the strip silicon steel sheet in the width direction, the first side edge is notched to form a first groove body, the second side edge is notched to form a second groove body, and along the running direction of the strip silicon steel sheet, a plurality of first groove bodies and a plurality of second groove bodies are formed by notching at intervals;

[0008] The slotted silicon steel sheet is wound in multiple layers along the belt running direction, the first sides of the multiple layers form a first end face, the first slot bodies of the multiple layers of the first side are connected to form a first skewed slot, the second sides of the multiple layers form a second end face, and the second slot bodies of the multiple layers of the second side are connected to form a second skewed slot, so as to form a stator core;

[0009] The winding coil is installed so that the first oblique conductor is located in the first oblique slot, the second oblique conductor is located in the second oblique slot, the connecting conductor connects the first oblique conductor and the second oblique conductor, and the connecting conductor is attached to the inner and outer circumferential surfaces of the stator core and extends axially.

[0010] In an optional embodiment, when punching grooves at intervals to form a plurality of first groove bodies, punching grooves is started from the starting position of the strip silicon steel sheet, and the strip silicon steel sheet is divided into k sections, and each section is punched to form Nz first groove bodies;

[0011] First, take the tooth width as b Z , the slot width is b N , complete the notching of the first section of the strip silicon steel sheet;

[0012] Afterwards, when punching the grooves of the i-th section of the strip silicon steel sheet, the tooth width at the starting position of each section is b Z +(△b Z +△s)×(i-1), after the starting position of each segment, the tooth width is b Z +△b Z ×(i-1), where 2≤i≤k and i is an integer, and the width of each slot is b N .

[0013] In an optional embodiment, a plurality of second slot bodies are notched synchronously with a plurality of first slot bodies. When a plurality of second slot bodies are formed by notching at intervals, notching is started from the starting position of the strip silicon steel sheet, and the strip silicon steel sheet is divided into k sections, and each section is notched to form Nz second slot bodies.

[0014] First, take the tooth width as b Z , the slot width is b N , complete the notching of the first section of the strip silicon steel sheet;

[0015] Afterwards, when punching the grooves of the i-th section of the strip silicon steel sheet, the tooth width at the starting position of each section is b Z +(△b Z -△s)×(i-1), after the starting position of each segment, the tooth width is b Z +△b Z ×(i-1), where 2≤i≤k and i is an integer, and the width of each slot is b N .

[0016] In an optional embodiment, the thickness of the strip silicon steel sheet is d, the inner diameter of the stator core is D0, the outer diameter of the stator core is D1, and the number of slots of the first inclined slot and the second inclined slot inclined relative to the radial direction is S, satisfying:

[0017] In an optional implementation, the winding coil is formed by Hair-PIN or continuous wave winding.

[0018] In a third aspect, the present invention further provides an axial motor, comprising the above-mentioned double-sided skew slot stator.

[0019] In an optional implementation, the number of poles of the axial motor is 2p, and the inclination angles of the first inclined slot and the second inclined slot are α, satisfying α=360° / 2p.

[0020] In an optional embodiment, the number of poles of the axial motor is 2p, the number of slots of the first oblique slot is Q, and in one of the winding coils, the number of slots spanned by the first oblique segment conductor is Q / 2p; the number of poles of the axial motor is 2p, the number of slots of the second oblique slot is Q, and in one of the winding coils, the number of slots spanned by the second oblique segment conductor is Q / 2p.

[0021] The technical solution of this application has the following advantages:

[0022] By respectively providing the first oblique slot and the second oblique slot on the first end face and the second end face of the stator core, the first oblique segment conductor and the second oblique segment conductor of the winding coil can be respectively embedded in the first oblique slot and the second oblique slot, and the connecting segment conductor connecting the first oblique segment conductor and the second oblique segment conductor can be axially attached to the inner circumference and the outer circumference of the stator core, so that the end and space of the stator winding can be reduced as much as possible or even the circumferential connecting segment can be eliminated, while saving the winding coil material and cost, making the heating temperature of different positions of the stator winding more uniform, simplifying the cooling design of the stator, and making the axial motor using the double-sided oblique slot stator of the present application meet the design requirements of high power, large torque and small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic structural diagram of a first end surface and a portion of a first chute according to an embodiment of the present invention;

[0025] Figure 2 It is a schematic structural diagram of a second end surface and a portion of a second chute according to an embodiment of the present invention;

[0026] Figure 3 for Figure 1 The first inclined groove shown is projected axially at Figure 2 A schematic structural diagram of the second end face shown;

[0027] Figure 4 for Figure 3 A schematic diagram of the structure of a corresponding winding coil;

[0028] Figure 5 for Figure 3 A schematic diagram of the structure of another corresponding winding coil;

[0029] Figure 6 It is a schematic structural diagram of a first end surface and a first chute according to an embodiment of the present invention;

[0030] Figure 7 A schematic diagram of the structure of the second end surface and the second chute according to an embodiment of the present invention;

[0031] Figure 8 for Figure 6 The first inclined groove shown is projected axially at Figure 7 A schematic structural diagram of the second end face shown;

[0032] Fig. 9 A schematic diagram of the structure of the first oblique conductor and the second oblique conductor and the magnetic pole according to an embodiment of the present invention

[0033] Fig.10 It is a schematic structural diagram of a plurality of first tank bodies and a plurality of second tank bodies according to an embodiment of the present invention;

[0034] Fig.11 This is a schematic structural diagram of a double-sided skewed slot stator according to an embodiment of the present invention;

[0035] Fig.12 Schematic diagram of the structure of another double-sided skew slot stator according to an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1. First end face; 2. Second end face; 3. First oblique groove; 4. Second oblique groove; 5. First oblique conductor; 6. Second oblique conductor; 7. Inner connecting segment; 8. Outer connecting segment; 9. Magnetic pole. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] Combine the following Figures 1 to 12 , describing an embodiment of the present invention.

[0040] According to an embodiment of the present invention, on the one hand, a double-sided skewed slot stator is provided, comprising: a stator core and at least one winding coil. The stator core is formed with a first end face 1 and a second end face 2 at both ends in the axial direction, a first skewed slot 3 is provided on the first end face 1, and a plurality of first skewed slots 3 are provided along the circumference of the first end face 1, a second skewed slot 4 is provided on the second end face 2, and a plurality of second skewed slots 4 are provided along the circumference of the second end face 2, and the first skewed slot 3 and the second skewed slot 4 are both inclined relative to the radial direction of the stator core and the inclination directions are opposite. The first skewed slot 3 is projected on the second end face 2 in the axial direction, and there is an intersection point of the projection of the second skewed slot 4 and the first skewed slot 3 located on the inner circumference of the stator core, and there is another intersection point of the projection of the second skewed slot 4 and the first skewed slot 3 located on the outer circumference of the stator core. The winding coil includes a first oblique segment conductor 5, a second oblique segment conductor 6 and a connecting segment conductor. The first oblique segment conductor 5 is arranged in the first oblique slot 3, the second oblique segment conductor 6 is arranged in the second oblique slot 4, and the connecting segment conductor connects the first oblique segment conductor 5 and the second oblique segment conductor 6. The connecting segment conductor is attached to the inner circumference and the outer circumference of the stator core and extends axially.

[0041] By respectively providing the first oblique slot 3 and the second oblique slot 4 on the first end face 1 and the second end face 2 of the stator core, the first oblique segment conductor 5 and the second oblique segment conductor 6 of the winding coil can be respectively embedded in the first oblique slot 3 and the second oblique slot 4, and the connecting segment conductor connecting the first oblique segment conductor 5 and the second oblique segment conductor 6 can be axially attached to the inner circumference and the outer circumference of the stator core, so that the end and space of the stator winding can be reduced as much as possible, or even the circumferential connecting segment can be eliminated (see Fig.11 and Fig.12 ), while saving winding coil materials and costs, the heating temperature of different positions of the stator winding is made more uniform, the cooling design of the stator is simplified, and the axial motor using the double-sided skew slot stator of this embodiment meets the design requirements of high power, high torque and small volume.

[0042] It is worth noting that the stator core is cylindrical, so that the stator core forms an inner peripheral surface and an outer peripheral surface which are mutually separated and coaxially arranged. Figures 1 to 8 The direction perpendicular to the drawing surface.

[0043] It should be noted that the inclination directions of the first chute 3 and the second chute 4 are opposite. Figure 1 , the radial direction ( Figure 1 (shown by the dashed line in the middle) is tilted to the left, see Figure 2 , the radial direction ( Figure 2 The setting is tilted to the right (shown by the dashed line in the middle).

[0044] Further, such as Figures 3 to 5 as well as Fig.11 and Fig.12 As shown, the connecting segment conductor includes an inner connecting segment 7 and an outer connecting segment 8. The inner connecting segment 7 is attached to the inner circumference of the stator core and extends in the axial direction, and the inner connecting segment 7 connects the ends of the first oblique segment conductor 5 and the second oblique segment conductor 6 located on the inner circumference of the stator core; the outer connecting segment 8 is attached to the outer circumference of the stator core and extends in the axial direction, and the outer connecting segment 8 connects the ends of the first oblique segment conductor 5 and the second oblique segment conductor 6 located on the outer circumference of the stator core.

[0045] In one embodiment, the number of poles of the axial motor used in the double-sided skew slot stator is 2p, the inclination angle of the first skew slot 3 and the second skew slot 4 is α, satisfying α=360° / 2p, the number of slots of the first skew slot 3 is Q, in a winding coil, the number of slots spanned by the first skew segment conductor 5 is Q / 2p, the number of slots spanned by the second skew segment conductor 4 is Q, and in a winding coil, the number of slots spanned by the second skew segment conductor 6 is Q / 2p.

[0046] It is worth mentioning that please refer to Fig. 9 , in the skew slot corresponding to a winding coil, the adjacent first skew slot 3 and the second skew slot 4 span two pole pitches, that is, from the first skew slot 3 to the second skew slot 4 and then back through a pair of poles, when the inclination angle of each first skew slot 3 and the inclination angle of each second skew slot 4 are the same, each is a magnetic pole 9. Taking the number of poles 2p=12 and the number of slots Q=36 as an example, the number of slots of the first skew slot 3 and the second skew slot 4 is S=Q / 2p=36 / 12=3, and the inclination angle (mechanical angle) of the first skew slot 3 and the second skew slot 4 is α=360° / 2p=360° / 12=30°. Taking the number of poles 2p=16 and the number of slots Q=36 as an example, the number of slots of the first skew slot 3 and the second skew slot 4 is S=Q / 2p=36 / 16=2.25, and the inclination angle (mechanical angle) of the first skew slot 3 and the second skew slot 4 is α=360° / 2p=360° / 16=22.5°.

[0047] Of course, in other alternative embodiments, the number of poles of the stator and the number of slots of the first inclined slot 3 and the second inclined slot 4 can be specifically set according to actual needs.

[0048] According to an embodiment of the present invention, on the other hand, a method for preparing a double-sided skewed slot stator is provided, which is used to prepare the double-sided skewed slot stator, comprising the steps of:

[0049] The first side edge and the second side edge are respectively formed on opposite sides of the strip silicon steel sheet in the width direction, the first side edge is notched to form a first groove body, the second side edge is notched to form a second groove body, and along the running direction of the strip silicon steel sheet, a plurality of first groove bodies and a plurality of second groove bodies are formed by notching at intervals;

[0050] The slotted silicon steel sheet is wound in multiple layers along the belt-feeding direction, the first sides of the multiple layers form a first end face 1, the first slot bodies of the multiple layers of the first side are connected to form a first skewed slot 3, the second sides of the multiple layers form a second end face 2, and the second slot bodies of the multiple layers of the second side are connected to form a second skewed slot 4, so as to form a stator core;

[0051] The winding coil is installed so that the first oblique segment conductor 5 is located in the first oblique slot 3, and the second oblique segment conductor 6 is located in the second oblique slot 4. The connecting segment conductor connects the first oblique segment conductor 5 and the second oblique segment conductor 6, and the connecting segment conductor is attached to the inner circumference and outer circumference of the stator core and extends axially.

[0052] It is worth noting that the width direction of the strip silicon steel sheet is perpendicular to the running direction of the strip silicon steel sheet.

[0053] Specifically, in one embodiment, when punching grooves at intervals to form a plurality of first groove bodies, punching grooves is started from the starting position of the strip silicon steel sheet, and the strip silicon steel sheet is divided into k sections, and each section is punched to form Nz first groove bodies;

[0054] First, take the tooth width as b Z , the slot width is b N , complete the notching of the first section of the strip silicon steel sheet;

[0055] Afterwards, when punching the grooves of the i-th section of the strip silicon steel sheet, the tooth width at the starting position of each section is b Z +(△b Z +△s)×(i-1), after the starting position of each segment, the tooth width is b Z +△b Z ×(i-1), where 2≤i≤k and i is an integer, and the width of each slot is b N .

[0056] It is worth noting that the slot width is the width of the first slot body along the running direction, and the tooth width is the width of the remaining portion of the punching slot between adjacent first slot bodies along the running direction.

[0057] It should be noted that if Fig.10 As shown, for the second section of the strip silicon steel sheet, the tooth width at the starting position of the second section is b Z +△b Z +△s, after the starting position of the second segment, the tooth width is b Z +△b Z ; For the third section of the strip silicon steel sheet, the tooth width at the starting position of the third section is b Z +(△b Z +△s)×2, after the starting position of the third segment, the tooth width is b Z +△b Z×2; ... and so on, for the kth section of the strip silicon steel sheet, the tooth width at the starting position of the kth section is b Z +(△b Z +△s)×(k-1), after the starting position of the kth segment, the tooth width is b Z +△b Z ×(k-1).

[0058] It is worth noting that when the slotted silicon steel sheet is wound along the conveying direction, k sections of the slotted silicon steel sheet are wound to form k layers, that is, the first section is wound to form the first layer, the second section is wound to form the second layer, and ... the kth section is wound to form the kth layer.

[0059] Furthermore, a plurality of second slot bodies are notched synchronously with a plurality of first slot bodies. When a plurality of second slot bodies are formed by notching at intervals, notching is started from the starting position of the strip silicon steel sheet, and the strip silicon steel sheet is divided into k sections, and each section is notched to form Nz second slot bodies.

[0060] First, take the tooth width as b Z , the slot width is b N , complete the notching of the first section of the strip silicon steel sheet;

[0061] Afterwards, when punching the grooves of the i-th section of the strip silicon steel sheet, the tooth width at the starting position of each section is b Z +(△b Z -△s)×(i-1), after the starting position of each segment, the tooth width is b Z +△b Z ×(i-1), where 2≤i≤k and i is an integer, and the width of each slot is b N .

[0062] It is worth noting that the slot width is the width of the second slot body along the tape running direction, and the tooth width is the width of the remaining portion of the punching slot between adjacent second slot bodies along the tape running direction. It can be understood that the width of the second slot body (slot width) is the same as the width of the first slot body (slot width), both of which are b N .

[0063] It should be noted that if Fig.10 As shown, for the second section of the strip silicon steel sheet, the tooth width at the starting position of the second section is b Z +△b Z -△s, after the starting position of the second segment, the tooth width is b Z +△b Z ; For the third section of the strip silicon steel sheet, the tooth width at the starting position of the third section is b Z +(△b Z -△s)×2, after the starting position of the third segment, the tooth width is b Z +△b Z×2; ... and so on, for the kth section of the strip silicon steel sheet, the tooth width at the starting position of the kth section is b Z +(△b Z -△s)×(k-1), after the starting position of the kth segment, the tooth width is b Z +△b Z ×(k-1).

[0064] Specifically, in one embodiment, the thickness of the strip silicon steel sheet is d, the inner diameter of the stator core is D0, the outer diameter of the stator core is D1, and the number of slots of the first inclined slot 3 and the second inclined slot 4 inclined relative to the radial direction is S, satisfying:

[0065] It is worth noting that the pitch of the tooth refers to the sum of a slot width and its corresponding tooth width. For example, the pitch of the tooth at the starting position of the first segment is t=b Z +b N Because the stator core is formed by winding after slotting the strip silicon steel sheet, as the diameter of the stator core gradually increases during the winding process, the pitch will increase by △t for each additional layer from the 1st layer to the kth layer. Since the slot width remains unchanged, the tooth width will also increase by △t (also known as △b Z ).

[0066] It should be further explained that the pitch of the teeth of the first layer (i.e., the inner circumference of the stator core) is t0, and the pitch of the teeth of the kth layer (i.e., the outer circumference of the stator core) is t1, satisfying From the 1st layer to the kth layer, the pitch of the teeth increases by t1-t0. Therefore, for each layer, the pitch of the teeth increases by and Substituting t0, t1 and k into the calculation, we get

[0067] In one embodiment, the winding coil is wound by Hair-PIN or continuous wave winding.

[0068] According to an embodiment of the present invention, on another aspect, an axial motor is provided, comprising the above-mentioned double-sided skew slot stator.

[0069] In one embodiment, the number of poles of the axial motor is 2p, the inclination angles of the first inclined slot 3 and the second inclined slot 4 are α, satisfying α=360° / 2p, the number of slots of the first inclined slot 3 is Q, in a winding coil, the number of slots spanned by the first inclined segment conductor 5 is Q / 2p, the number of slots spanned by the second inclined slot 4 is Q, and in a winding coil, the number of slots spanned by the second inclined segment conductor 6 is Q / 2p.

[0070] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A double-sided skewed slot stator, characterized in that: include: A stator core, wherein the stator core is respectively formed with a first end face (1) and a second end face (2) at two axial ends, the first end face (1) is provided with a first inclined slot (3), and a plurality of the first inclined slots (3) are provided at intervals along the circumference of the first end face (1), the second end face (2) is provided with a second inclined slot (4), and a plurality of the second inclined slots (4) are provided at intervals along the circumference of the second end face (2), the first inclined slot (3) and the second inclined slot (4) are both arranged to be inclined relative to the radial direction of the stator core and the inclined directions are opposite; the first inclined slot (3) is projected onto the second end face (2) along the axial direction, there is an intersection point of the second inclined slot (4) and the projection of the first inclined slot (3) located on the inner circumference of the stator core, and there is another intersection point of the second inclined slot (4) and the projection of the first inclined slot (3) located on the outer circumference of the stator core; At least one winding coil comprises a first oblique segment conductor (5), a second oblique segment conductor (6) and a connecting segment conductor, wherein the first oblique segment conductor (5) is arranged in the first oblique slot (3), the second oblique segment conductor (6) is arranged in the second oblique slot (4), the connecting segment conductor connects the first oblique segment conductor (5) and the second oblique segment conductor (6), and the connecting segment conductor is attached to the inner circumference and the outer circumference of the stator core and extends in the axial direction.

2. The double-sided skewed slot stator according to claim 1, characterized in that: The connecting segment conductor comprises an inner connecting segment (7) and an outer connecting segment (8); The inner connecting section (7) is attached to the inner circumference of the stator core and extends in the axial direction, and the inner connecting section (7) connects the ends of the first oblique conductor (5) and the second oblique conductor (6) located on the inner circumference of the stator core; The outer connecting section (8) is fitted to the outer circumferential surface of the stator core and extends axially, and the outer connecting section (8) connects the ends of the first oblique conductor (5) and the second oblique conductor (6) located on the outer circumference of the stator core.

3. A method for preparing a double-sided skewed slot stator, used for preparing the double-sided skewed slot stator according to claim 1 or 2, characterized in that: Includes steps: The first side edge and the second side edge are respectively formed on opposite sides of the strip silicon steel sheet in the width direction, the first side edge is notched to form a first groove body, the second side edge is notched to form a second groove body, and along the running direction of the strip silicon steel sheet, a plurality of first groove bodies and a plurality of second groove bodies are formed by notching at intervals; The slotted silicon steel sheets are wound in multiple layers along the running direction, the first sides of the multiple layers form a first end face (1), the first slot bodies of the multiple layers of the first sides are connected to form a first skewed slot (3), the second sides of the multiple layers form a second end face (2), and the second slot bodies of the multiple layers of the second sides are connected to form a second skewed slot (4), so as to form a stator core; The winding coil is installed so that the first oblique segment conductor (5) is located in the first oblique slot (3), the second oblique segment conductor (6) is located in the second oblique slot (4), the connecting segment conductor connects the first oblique segment conductor (5) and the second oblique segment conductor (6), and the connecting segment conductor is attached to the inner circumference and outer circumference of the stator core and extends in the axial direction.

4. The method for preparing a double-sided skewed slot stator according to claim 3, characterized in that: When punching grooves at intervals to form a plurality of first groove bodies, punching grooves starts from the starting position of the strip silicon steel sheet, and the strip silicon steel sheet is divided into k sections, and each section is punched to form Nz first groove bodies; First, take the tooth width as b Z , the slot width is b N , complete the notching of the first section of the strip silicon steel sheet; Afterwards, when punching the grooves of the i-th section of the strip silicon steel sheet, the tooth width at the starting position of each section is b Z +(△b Z +△s)×(i-1), after the starting position of each segment, the tooth width is b Z +△b Z ×(i-1), where 2≤i≤k and i is an integer, and the width of each slot is b N .

5. The method for preparing a double-sided skewed slot stator according to claim 4, characterized in that: A plurality of second slot bodies are notched synchronously with a plurality of first slot bodies. When a plurality of second slot bodies are formed by notching at intervals, notching is started from the starting position of the strip silicon steel sheet, and the strip silicon steel sheet is divided into k sections. Each section is notched to form Nz second slot bodies. First, take the tooth width as b Z , the slot width is b N , completing the notching of the first section of the strip silicon steel sheet; Afterwards, when punching the grooves of the i-th section of the strip silicon steel sheet, the tooth width at the starting position of each section is b Z +(△b Z -△s)×(i-1), after the starting position of each segment, the tooth width is b Z +△b Z ×(i-1), where 2≤i≤k and i is an integer, and the width of each slot is b N .

6. The method for preparing a double-sided skewed slot stator according to claim 5, characterized in that: The thickness of the strip silicon steel sheet is d, the inner diameter of the stator core is D0, the outer diameter of the stator core is D1, the number of slots of the first inclined slot (3) and the second inclined slot (4) inclined relative to the radial direction is S, and the following conditions are satisfied:

7. The method for preparing a double-sided skewed slot stator according to claim 3, characterized in that: The winding coil is formed by Hair-PIN or continuous wave winding.

8. An axial motor, characterized in that: It comprises the double-sided skew slot stator as described in claim 1 or 2.

9. The axial motor according to claim 8, characterized in that: The number of poles of the axial motor is 2p, and the inclination angle of the first inclined slot (3) and the second inclined slot (4) is α, satisfying α=360° / 2p.

10. The axial motor according to claim 8, characterized in that The number of poles of the axial motor is 2p, the number of slots of the first oblique slot (3) is Q, and in one of the winding coils, the number of slots spanned by the first oblique segment conductor (5) is Q / 2p; the number of poles of the axial motor is 2p, the number of slots of the second oblique slot (4) is Q, and in one of the winding coils, the number of slots spanned by the second oblique segment conductor (6) is Q / 2p.

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