CN212969191U - Motor stator iron core, stator winding module, motor stator and axial flux motor - Google Patents

Abstract

The utility model relates to a motor stator core, stator winding module, motor stator and axial flux motor. The motor stator iron core comprises an iron core main body and pole shoes, the motor stator iron core comprises a plurality of silicon steel bar members, each silicon steel bar member comprises an iron core main body part and pole shoe parts respectively arranged at two ends of the iron core main body part, the lengths of the iron core main body parts of the silicon steel bar members are the same, the widths of at least two iron core main body parts of the silicon steel bar members are different, and the widths of at least two silicon steel bar members positioned at the same end are different; a plurality of silicon steel bar members are stacked and fixed in a manner that the center lines of the core main portions are aligned and in the order of the width dimension of the core main portions, thereby constituting a core main body having stepped side portions and/or a pole shoe having stepped side portions. The utility model discloses a modular design, it is with low costs, manufacturing is simple, can use to have oriented silicon steel sheet as raw and other materials, can provide great moment of torsion, reduces the iron loss, promotes motor efficiency.

Description

Motor stator iron core, stator winding module, motor stator and axial flux motor

Technical Field

The utility model belongs to the technical field of the motor, concretely relates to motor stator core, stator winding module, motor stator and axial flux motor are applicable to axial flux motor.

Background

The stator of the motor is an important component of the motor such as a generator, a starter and the like, and consists of a stator core, a stator winding and a machine base. The stator core and the rotor core, and the air gaps between the stator and the rotor form a complete magnetic circuit of the motor, and the structure and the arrangement of the stator core are related to the overall performance of the motor.

In the prior art, a stator core of an axial flux motor is mostly formed by winding a silicon steel strip with stator slots, and a stator tooth part and a stator yoke part of the axial flux motor are of an integral structure. Because the magnetic force lines of the tooth part and the yoke part are different in trend, the magnetic force lines of the tooth part are parallel to the axial direction, the magnetic force lines of the yoke part are perpendicular to the axial direction, the stator iron core is made of non-oriented silicon steel coils, and compared with the oriented silicon steel coils, the loss of the iron core is high in the tooth part of the stator, the magnetic density saturation point is low, and the overall efficiency and the maximum output torque of the motor are influenced.

In addition, the condition that the iron core is manufactured by stacking the silicon steel sheets along the thickness direction of the iron core exists in the prior art, but the iron core is required to have a section shape which is trapezoidal and has smooth side edges as far as possible, so that the stacked silicon steel sheets are gradually changed in size and are different from each other, different punching and grinding tools are required to be used for respectively punching and forming, the machining process is complex, the assembly difficulty is high, and the manufacturing cost is high.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that above-mentioned motor core processing technology is complicated, the equipment degree of difficulty is high, the utility model provides a motor stator core, stator winding module, motor stator and axial flux motor.

According to one aspect of the utility model, the motor stator iron core comprises an iron core main body and pole shoes respectively arranged at two ends of the iron core main body,

the motor stator iron core comprises a plurality of silicon steel bar members, and each silicon steel bar member comprises an iron core main body part and pole shoe parts respectively arranged at two ends of the iron core main body part;

the lengths of the iron core main parts of the silicon steel strip members are the same, the widths of at least two iron core main parts of the silicon steel strip members are different, and the widths of at least two pole shoe parts of the silicon steel strip members at the same end are different;

the plurality of silicon steel bar members are stacked and fixed in a manner that the center lines of the core main portions are aligned and in the order of the width dimension of the core main portions, and constitute the core main portion having stepped side portions and/or the pole shoe having stepped side portions.

In an embodiment of the present invention, the plurality of silicon steel strip members at least include a first silicon steel strip member and a second silicon steel strip member, and the relationship between the width and the size of the iron core main body part of the first silicon steel strip member and the width and the size of the pole shoe part of the second silicon steel strip member is not opposite to the relationship between the width and the size of the pole shoe part of the first silicon steel strip member and the width and the size of the pole shoe part of the second silicon steel strip member.

In one embodiment of the present invention, the ratio of the width of the core body portion of the first silicon steel strip member to the width of the pole shoe portion of the first silicon steel strip member is the same as the ratio of the width of the core body portion of the second silicon steel strip member to the width of the pole shoe portion of the second silicon steel strip member.

In one embodiment of the present invention, the plurality of step beads of the step-like side portion of the core main body are substantially located in one plane, and/or the plurality of step beads of the step-like side portion of the pole shoe are substantially located in one plane.

In one embodiment of the present invention, the side wall of the silicon steel strip member is a smooth side wall.

In one embodiment of the present invention, the side wall of the silicon steel strip member is perpendicular to the upper surface and the lower surface of the silicon steel strip member, and perpendicular to the front wall and the rear wall of the silicon steel strip member.

In one embodiment of the present invention, the silicon steel strip member is a symmetrical i-shape, including a rectangular parallelepiped-shaped iron core main portion and rectangular parallelepiped-shaped pole shoe portions transversely provided at both ends of the iron core main portion, respectively.

In an embodiment of the present invention, a silicon steel bar member located at the outer ring side of the motor stator core among the plurality of silicon steel bar members has a first thickness, and the other silicon steel bar members have the same second thickness, and the widths of the plurality of silicon steel bar members are increased or decreased in equal proportion.

In an embodiment of the invention, the first thickness is greater than the second thickness.

In an embodiment of the present invention, the side corner of the end surface on the inner ring side and/or the outer ring side of the core main body is an arc-shaped chamfer.

In one embodiment of the present invention, one or more of the silicon steel strip members are composed of a plurality of silicon steel sheets stacked one on another.

In an embodiment of the present invention, the silicon steel sheet is an oriented silicon steel sheet, and an orientation direction of the silicon steel sheet is the same as a magnetic flux direction of the iron core.

According to another aspect of the present invention, the stator winding module includes the motor stator core and the winding as described above, the winding is wound on the outside of the core main body of the motor stator core.

In an embodiment of the present invention, an insulating paper is disposed between the winding and the core body, and the insulating paper surrounds the core body and is bonded to the core body.

According to another aspect of the present invention, the motor stator includes a plurality of stator winding modules arranged in a circumferential direction based on a central axis of the motor stator, and one or more stator winding modules of the plurality of stator winding modules are the stator winding modules as described above.

In one embodiment of the invention, the plurality of stator winding modules are all stator winding modules as described above,

the motor stator iron cores of the plurality of stator winding modules have the same overall size, and the silicon steel strip members of the motor stator iron cores are in a symmetrical I shape and comprise rectangular iron core main body parts and rectangular pole shoe parts which are transversely arranged at two ends of the iron core main body parts respectively;

the side edge of the winding is within the area limited by the plurality of step-shaped protruding ridges on the step-shaped side part of the pole shoe or is flush with the plane where the plurality of step-shaped protruding ridges on the step-shaped side part of the pole shoe are located.

In one embodiment of the present invention, the average distance c from the plurality of stepped ridges and the plurality of stepped valleys at the stepped side portions of the pole shoe of the stator core of the motor to the bisecting plane M of the adjacent stator winding module is a value within a range of 1% L to 3% L,

wherein the stator winding module bisection plane M is a plane of two adjacent stator winding modules in the circumferential direction based on the central axis O of the motor stator,

the distance from the motor stator central axis O to the side edge of the inner ring side pole shoe end face of the motor stator core is an inner radius R1, the perpendicular distance from the motor stator central axis O to the outer ring side pole shoe end face of the motor stator core is determined as an outer radius R2, and the radius R of the center circle of the motor stator core is (R1+ R2)/2, resulting in the arc length L of the center circle between the stator winding module bisecting planes M on both sides of one stator winding module.

In an embodiment of the present invention, the average distance c between the plurality of step ridges and the plurality of step valleys on the step-like side portion of the pole shoe of the motor stator core to the adjacent stator winding module bisecting plane M is 2% L.

In an embodiment of the invention the axial flux machine comprises a machine stator as described above.

The utility model has the advantages that: the embodiment of the utility model provides a motor stator iron core, stator winding module, motor stator and axial flux motor adopt the modularized design, and manufacturing is simple. In addition, oriented silicon steel sheets can be used as raw materials, the cost is low, large torque can be provided, iron loss is reduced, and the motor efficiency is improved.

Drawings

Fig. 1 is a schematic view of a stator core of an electrical machine according to a first aspect of the present invention;

fig. 2 is yet another schematic view of a stator core of an electrical machine according to a first aspect of the present invention;

fig. 3 is a schematic view of a stator winding module according to a second aspect of the invention;

fig. 4 is a schematic diagram of the winding of insulation paper of a stator winding module according to a second aspect of the invention;

fig. 5 is a schematic view of a core of a stator winding module according to a second aspect of the present invention after winding insulating paper;

fig. 6 is a top view of a section of the core of a stator winding module according to a second aspect of the invention, taken in the direction P-P of fig. 5;

fig. 7 is a schematic view of a motor stator according to a third aspect of the present invention;

FIG. 8 is a top view of the motor stator shown in FIG. 7;

fig. 9 is an enlarged partial view of adjacent stator winding modules of the first embodiment of the electric machine stator of fig. 8;

fig. 10 is an enlarged partial view of adjacent stator winding modules of the stator of an electrical machine having planar side walls;

FIG. 11 is a graph showing the variation of T/Tmax with c/L of the motor stators of the large motor and the small motor having the structure shown in FIG. 10;

fig. 12 is a top partial enlarged view of adjacent stator winding modules of a second embodiment of an electric machine stator according to a third aspect of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the present invention is not limited to the drawings and the following embodiments.

As used herein, the term "include" and its various variants are to be understood as open-ended terms, which mean "including, but not limited to. The terms "upper", "lower" and the like are used only to indicate a positional relationship between relative objects. The terms "first", "second" and the like are used merely to indicate different technical features and have no essential meaning.

According to the utility model discloses a first aspect, the embodiment of the utility model provides a motor stator core 1 is proposed, as shown in fig. 1, motor stator core 1 includes iron core main part 11 and sets up the pole shoe 12 at iron core main part 11 both ends respectively.

The motor stator core 1 comprises a plurality of silicon steel bar members 13, wherein each silicon steel bar member 13 comprises a core main body part 131 and pole shoe parts 132 respectively arranged at two ends of the core main body part 131; the side walls of the silicon steel strip member 13 are smooth side walls.

The lengths (the dimensions in the height direction in the drawing) of the core main portions 131 of the plurality of silicon steel bar members 13 are the same, the widths of at least two core main portions 131 of the plurality of silicon steel bar members 13 are different, and the widths of at least two pole shoe portions 132 of the plurality of silicon steel bar members 13 at the same end are different. Wherein the plurality of silicon steel strip members 13 at least include a first silicon steel strip member and a second silicon steel strip member, and the width size relationship formed based on the core body portion of the first silicon steel strip member and the core body portion of the second silicon steel strip member is not opposite to the width size relationship formed based on the pole shoe portion of the first silicon steel strip member and the pole shoe portion of the second silicon steel strip member, that is, if the width of the core body portion 131 of the first silicon steel strip member 13 is greater than the width of the core body portion 131 of the second silicon steel strip member 13, the width of the pole shoe portion 132 of the first silicon steel strip member 13 is also greater than or equal to the width of the pole shoe portion 132 of the second silicon steel strip member 13 but not less than the width of the pole shoe portion 132 of the second silicon steel strip member 13, and vice versa. Preferably, the ratio of the width of the core body portion of the first silicon steel strip member to the width of the pole shoe portion of the first silicon steel strip member is the same as the ratio of the width of the core body portion of the second silicon steel strip member to the width of the pole shoe portion of the second silicon steel strip member. More preferably, the ratio of the widths of the core body portions 131 and the pole shoe portions 132 of the plurality of silicon steel strip members 13 is the same.

The plurality of silicon steel bar members 13 are stacked and fixed, for example, adhered, in a manner that the center lines of the core main portions 131 are aligned and in order of the width dimension of the core main portions 131, to form the core main portion 11 having stepped side portions and/or the pole shoe 12 having stepped side portions. Preferably, the stepped ribs 133 of the stepped side portions of the core body 11 are substantially in a plane, and the stepped ribs 134 of the stepped side portions of the pole pieces 12 are substantially in a plane. The two planes are parallel to each other when the ratio of the widths of the core body portions 131 and the pole shoe portions 132 of the plurality of silicon steel bar members 13 is the same.

In the present embodiment, as shown in fig. 1, the silicon steel strip member 13 has a symmetrical i-shape, and includes a rectangular parallelepiped core main portion 131 and rectangular parallelepiped pole shoe portions 132 respectively transversely disposed at both ends of the core main portion 131. The side walls of the silicon steel strip member 13 are perpendicular to the upper and lower surfaces of the silicon steel strip member 13, and to the front and rear walls of the silicon steel strip member 13. Those skilled in the art will appreciate that the shape of the core body portion 131 and the pole shoe portion 132 shown in fig. 1 is merely an example, and particularly, the shape of the pole shoe portion 132 may be modified in various ways, such as a crescent shape. The center lines of the four silicon steel strip members 13 shown in fig. 1 coincide and are stacked in order from wide to narrow, one silicon steel strip member 13 located on the outer ring side (the side with the largest width dimension) of the motor stator core 1 among the plurality of silicon steel strip members 13 has a first thickness, the other silicon steel strip members 13 have the same second thickness, and the widths of the four silicon steel strip members 13 are increased or decreased in equal proportion, such as 1:0.8:0.64:0.512, wherein the first thickness is larger than the second thickness, so as to adjust the thickness of the increased core, and the rotor magnetic steel of the axial flux motor does not exceed the thickness range of the stator core. Those skilled in the art will appreciate that the width and thickness of the plurality of silicon steel strip members 13 constituting the motor stator core 1 may be configured according to the cross-sectional shape of the preformed motor stator core 1 (the core body 11 and the pole pieces 12).

In order to facilitate winding of the winding on the stator core 1 of the motor and reduce damage of the core sharp corner to the winding, a side corner 135 of an end surface of the inner ring side (the side with the smallest width dimension) and/or the outer ring side (the side with the largest width dimension) of the core main body 11 is an arc-shaped chamfer (not shown in the figure). Thereby, the widths of the silicon steel strip members 13 and other silicon steel strip members 13 on the inner ring side and/or the outer ring side of the motor stator core 1 are not arranged in proportion as conventionally understood, but still basically follow the rule of width proportionality from the overall structure of the motor stator core 1, only the chamfer shape is changed.

In the present embodiment, the stator core 1 of the motor may be formed by stacking a plurality of silicon steel bar members 13, and preferably, the silicon steel bar members 13 are fixed by bonding, so that the stacking and fixing may be performed after the silicon steel bar members 13 are individually processed, and the process is simple. Meanwhile, the silicon steel strip member 13 can be manufactured by adopting a thinner silicon steel strip, so that the requirement on the raw material of the iron core is reduced.

In the above embodiment, at least one silicon steel strip member 13 of the plurality of silicon steel strip members 13 is composed of a plurality of silicon steel sheets stacked. In the embodiment shown in fig. 2, all the silicon steel strip members 13 are respectively formed by stacking a plurality of silicon steel sheets having the same shape and size, wherein the silicon steel strip member 13 on the outer ring side includes six silicon steel sheets, and the other three silicon steel strip members 13 include three silicon steel sheets.

Because the silicon steel strip members 13 are manufactured by adopting a plurality of silicon steel sheets, the silicon steel sheets can be punched and formed by oriented silicon steel plates with lower cost, the orientation directions of the punched and formed silicon steel sheets are the same as the magnetic flux direction of the iron core and point to the other pole shoe from one pole shoe, the performance of the motor can be optimized, larger torque is provided, the iron loss is reduced, and the efficiency of the motor is improved.

It should be noted that, according to the first aspect of the present invention, the basic structure of the stator core 1 of the motor is given, and those skilled in the art can further add other structures to form the stator core, for example, additional structures are provided on the front wall and the rear wall of the stator core 1 of the motor shown in fig. 1.

According to the utility model discloses a second aspect, the embodiment of the utility model provides a stator winding module is proposed, as shown in fig. 3, according to the utility model discloses the outside winding of the iron core main part 11 of the motor stator iron core 1 of first aspect has winding 2.

Preferably, as shown in fig. 4 to 6, an insulating paper 3 is disposed between the winding 2 and the core body 11, the insulating paper 3 surrounds the core body 11 and is adhered to the core body 11, and the winding 2 is wound on the outside of the insulating paper 3.

Therefore, the iron core body 11 is wrapped by the insulation paper 3, the winding 2 is wound on the insulation paper 3 outside the iron core body 11, and the insulation paper 3 separates the plurality of step-shaped convex ridges 133 on the step-shaped side edge part of the iron core body 11 from the winding 2, so that the insulation winding 2 is protected.

According to the utility model discloses a third aspect, the embodiment of the utility model provides a motor stator is proposed, as shown in fig. 7, include based on a plurality of stator winding modules that motor stator central axis O set up along the circumferencial direction, stator winding module has the structure according to the stator winding module of the second aspect of the utility model. The motor stator cores 1 of the plurality of stator winding modules have the same overall dimensions, i.e., the same height, thickness, and sidewall pitch, including the sidewall pitch of the core body 11 and the sidewall pitch of the pole shoes 12, and since the motor stator cores 1 have stepped side portions, the "sidewall pitch" referred to herein is the distance between the corresponding stepped ridges 133, 134 of the stepped side portions on both sides. The silicon steel strip member 13 of the stator core 1 of the motor is in a symmetrical i shape, and includes a rectangular parallelepiped core main portion 131 and rectangular parallelepiped pole shoe portions 132 respectively transversely disposed at two ends of the core main portion 131. The side edge of the winding 2 does not exceed the area defined by the stepped ledges 134 of the stepped side portions of the pole pieces 12, for example, the stepped ledges 134 of the stepped side portions of the pole pieces 12 are in a plane, and the side edge of the winding 2 does not exceed the plane in which the stepped ledges 134 of the stepped side portions of the pole pieces 12 are located. Preferably, the side edge of the winding 2 is flush with the plane of the stepped ridges 134 on the stepped side portion of the pole shoe 12, i.e., the volume of the winding is defined by the pole shoe 12, so as to reduce copper loss.

For a clearer representation of the utility model, fig. 7 only shows six stator winding modules arranged circumferentially, and the fixing structures such as the stator base and the viscose curing commonly used in the field are not shown.

According to the utility model discloses a fourth aspect, the embodiment of the utility model provides an axial flux motor is provided, include as above motor stator.

In the first embodiment shown in fig. 8 and 9, four silicon steel strip members have the same thickness, and the widths of the pole shoe portions 132 of the four silicon steel strip members 13 are arranged in equal proportion, so that the stepped ridges 134 of the stepped side portions of the pole shoes 12 of the motor stator core 1 are on a plane a, and the stepped valleys of the stepped side portions of the pole shoes 12 of the motor stator core 1 are on a plane B. The plane M is a stator winding module bisection plane M of two adjacent stator winding modules in the circumferential direction based on the central axis O of the motor stator, and is identified as a straight line in the top view of fig. 8, that is, as shown in fig. 8, the plane M bisects an included angle formed by a plane N1 and a plane N2, the plane N1 is a plane where the central axis O of the motor stator and the central line of the stator core of the stator winding module on the left side are located, and the plane N2 is a plane where the central axis O of the motor stator and the central line of the stator core of the stator winding module on the right side are located. The plane a is parallel to the plane B and substantially parallel to the adjacent plane M, and the distance from the plane a to the adjacent plane M is a, that is, the average distance from the plurality of stepped ridges 134 to the adjacent plane M is a; the distance from the plane B to the adjacent plane M is B, that is, the average distance from the plurality of stepped recessed ribs to the adjacent plane M is B. The average distance c from the plurality of stepped ridges 134 and the plurality of stepped valleys to the adjacent stator winding module bisecting plane M is calculated to be (a + b)/2. Of course, the average distance c can also be obtained by calculating the distance from each rib 134 and each recessed rib to the adjacent plane M, and dividing by the total number of ribs 134 and recessed ribs 8.

Determining the distance from the central axis O of the motor stator to the side edge of the end face of the inner ring side pole shoe of the motor stator core 1 as an inner side radius R1; the perpendicular distance from the motor stator center axis O to the outer ring side pole shoe end face of the motor stator core 1 is determined as the outside radius R2. Thus, the inboard radius R1 and the outboard radius R2 define an optimal coverage area for axial-flux electric machine rotor magnetic steel. The radius R of the center circle of the motor stator core 1 is defined as (R1+ R2)/2, and the arc length L of the center circle between the stator winding module bisecting planes M on both sides of one stator winding module is obtained.

Based on the above structure and parameter setting, in order to explore and reach better motor performance, the utility model discloses the people has first simulated the motor stator iron core that has planar lateral wall (iron core main part and pole shoe part do not have the stair structure), namely a in pole shoe portion b c, the local enlargements of the adjacent stator winding module that has planar lateral wall of motor stator are as shown in fig. 10.

In the simulation, a large motor (10 poles and 12 slots, L is 50mm) and a small motor (10 poles and 12 slots, L is 25mm) with typical sizes are selected for carrying out, and the simulation results are shown in tables 1 and 2:

TABLE 1

TABLE 2

Based on tables 1 and 2, when the c/L of the motor changes, T/Tmax has a corresponding change trend, and a graph of the change trend of T/Tmax along with c/L is obtained, and is shown in FIG. 11. As can be seen from the figure, when c is taken within the range of 1% L-3% L, the torque of the motor is within the maximum range, and the fluctuation is small and basically does not exceed 1%. And when c is taken near 2% L, the torque is close to the maximum value.

The utility model person then simulates the motor based on the first embodiment shown in fig. 8 and 9, and the simulation results are shown in table 3 and table 4:

TABLE 3

Table 4 as can be seen from tables 3 and 4, the motor (a ≠ b) of the first embodiment shown in fig. 8 and 9 has similar performance to the motor having the motor stator core with the planar side wall (a ═ b), and also satisfies the motor performance trend variation law based on tables 1 and 2, that is, when c is taken within the range of 1% L to 3% L, the motor torque is within the maximum range interval, and the fluctuation is small, and is substantially not more than 1%. And when c is taken near 2% L, the torque is close to the maximum value.

In order to further verify the motor performance of the motor stator core including the embodiment of the present invention, the utility model discloses the people still emulates the motor based on the second embodiment as shown in fig. 12.

In the second embodiment, the distances from the plurality of stepped ribs 134 of the stepped side portion of the pole piece 12 of the stator core 1 to the plane M are a1, a2, a3, respectively, and the distances from the plurality of stepped recessed ribs of the stepped side portion of the pole piece 12 to the plane M are b1, b2, b3, and the average value thereof (a1+ a2+ a3+ b1+ b2+ b3)/6 is used as the average distance c. The simulation results are shown in table 5 (small motor):

TABLE 5

Through simulation, the motor in the second embodiment also meets the motor performance change rule obtained by the comparative example and the first embodiment. Namely, when c is taken within the range of 1% L-3% L, the torque of the motor is within the maximum range, and the fluctuation is small and basically not more than 1%. And when c is taken near 2% L, the torque is close to the maximum value.

Therefore, the embodiment of the utility model provides a motor stator can adopt the modularized design, and manufacturing is simple, has the same moment of torsion performance with conventional motor.

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

The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (19)

1. A motor stator iron core (1) comprises an iron core main body (11) and pole shoes (12) respectively arranged at two ends of the iron core main body (11),

the motor stator core (1) comprises a plurality of silicon steel strip members (13), wherein each silicon steel strip member (13) comprises a core main body part (131) and pole shoe parts (132) respectively arranged at two ends of the core main body part (131);

the lengths of the core body parts (131) of the plurality of silicon steel bar elements (13) are the same, the widths of at least two core body parts (131) of the plurality of silicon steel bar elements (13) are different, and the widths of at least two pole shoe parts (132) of the plurality of silicon steel bar elements (13) at the same end are different;

the silicon steel strip members (13) are stacked and fixed in a mode that the center lines of the core main body parts (131) are aligned and according to the width size sequence of the core main body parts (131) to form the core main body (11) with step-shaped side edge parts and/or the pole shoe (12) with step-shaped side edge parts.

2. The stator core (1) of an electric machine according to claim 1, wherein the plurality of silicon steel strip members (13) comprises at least a first silicon steel strip member and a second silicon steel strip member, and a width dimension relationship based on a core body portion of the first silicon steel strip member and a core body portion of the second silicon steel strip member is not opposite to a width dimension relationship based on a pole shoe portion of the first silicon steel strip member and a pole shoe portion of the second silicon steel strip member.

3. The electric machine stator core (1) according to claim 2, wherein the ratio of the width of the core body portion of the first silicon steel strip member to the width of the pole shoe portion of the first silicon steel strip member is the same as the ratio of the width of the core body portion of the second silicon steel strip member to the width of the pole shoe portion of the second silicon steel strip member.

4. Stator core (1) for an electrical machine according to claim 2, characterized in that the stepped ridges (133) of the stepped side portions of the core body (11) lie substantially in one plane and/or the stepped ridges (134) of the stepped side portions of the pole shoes (12) lie substantially in one plane.

5. Stator core (1) for an electrical machine according to claim 1, wherein the side walls of the silicon steel strip member (13) are smooth side walls.

6. Stator core (1) for an electrical machine according to claim 5, characterized in that the side walls of the silicon steel strip element (13) are perpendicular to the upper and lower surfaces of the silicon steel strip element (13) and to the front and rear walls of the silicon steel strip element (13).

7. An electric machine stator core (1) according to claim 6, wherein the silicon steel strip member (13) has a symmetrical I-shape including a rectangular parallelepiped core main portion (131) and rectangular parallelepiped pole shoe portions (132) laterally provided at both ends of the core main portion (131).

8. The stator core (1) of an electric machine according to claim 6, characterized in that one silicon steel bar element (13) of the plurality of silicon steel bar elements (13) located at the outer ring side of the electric machine stator core (1) has a first thickness, the other silicon steel bar elements (13) have the same second thickness, and the width of the plurality of silicon steel bar elements (13) increases or decreases in equal proportion.

9. An electric machine stator core (1) according to claim 8, characterized in that the first thickness is larger than the second thickness.

10. The stator core (1) of an electrical machine according to claim 1, characterized in that the side corners (135) at the end faces of the inner ring side and/or the outer ring side of the core body (11) are arc-shaped chamfers.

11. Motor stator core (1) according to any of claims 1 to 10, wherein one or more silicon steel strip members (13) of said plurality of silicon steel strip members (13) are constituted by a plurality of silicon steel sheets stacked.

12. The stator core (1) of an electrical machine according to claim 11, wherein the silicon steel sheets are oriented silicon steel sheets, and the orientation direction of the silicon steel sheets is the same as the magnetic flux direction of the core.

13. A stator winding module, characterized in that it comprises an electric machine stator core (1) according to any of claims 1-12 and a winding (2), the winding (2) being wound on the outside of the core body (11) of the electric machine stator core (1).

14. A stator winding module according to claim 13, characterized in that an insulating paper (3) is arranged between the winding (2) and the core body (11), which insulating paper (3) surrounds the core body (11) and is glued to the core body (11).

15. A motor stator, characterized in that the motor stator comprises a plurality of stator winding modules arranged in a circumferential direction based on a motor stator centre axis, one or more of the stator winding modules being a stator winding module according to claim 13 or 14.

16. An electrical machine stator according to claim 15, wherein each of the plurality of stator winding modules is a stator winding module according to claim 13 or 14,

the motor stator iron cores (1) of the plurality of stator winding modules have the same overall size, and the silicon steel bar members (13) of the motor stator iron cores (1) are in a symmetrical I shape and comprise rectangular iron core main body parts (131) and rectangular pole shoe parts (132) which are transversely arranged at two ends of the iron core main body parts (131);

the side edge of the winding (2) is within the area limited by the step-shaped convex ridges (134) of the step-shaped side part of the pole shoe (12) or is flush with the plane where the step-shaped convex ridges (134) of the step-shaped side part of the pole shoe (12) are positioned.

17. An electric machine stator according to claim 15, characterized in that the average distance c of the stepped ridges (134) and the stepped valleys of the stepped side portions of the pole shoes (12) of the electric machine stator core (1) to the adjacent stator winding module bisecting plane M is in the range of 1-3% L,

wherein the stator winding module bisection plane M is a plane of two adjacent stator winding modules in the circumferential direction based on the central axis O of the motor stator,

the distance from the motor stator central axis O to the side edge of the inner ring side pole shoe end face of the motor stator core (1) is an inner radius R1, the perpendicular distance from the motor stator central axis O to the outer ring side pole shoe end face of the motor stator core (1) is determined as an outer radius R2, the radius R of the center circle of the motor stator core (1) is (R1+ R2)/2, and the arc length L of the center circle between the stator winding module bisecting planes M on both sides of one stator winding module is obtained.

18. An electric machine stator according to claim 17, characterized in that the average distance c of the stepped ridges (134) and the stepped valleys of the stepped side portions of the pole shoes (12) of the electric machine stator core (1) to the adjacent stator winding module bisecting plane M is 2% L.

19. An axial flux machine comprising a machine stator according to any one of claims 15 to 18.

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