Stator structure of flat wire winding with unequal linear width and motor using stator structure

Abstract

The invention belongs to the technical field of motors, and particularly relates to a stator structure of a linear unequal-width flat wire winding and a motor using the stator structure. The stator structure comprises a stator iron core, the stator iron core is provided with stator grooves (13) with different widths, two sides of each stator groove (13) are parallel, the width of the bottom (11) of each stator groove is large, and the width of the middle (12) of each stator groove is small. The radial widening ratio of the stator slots (13) is determined according to the sectional area and the ratio of the number of layers of the conductors to the total number of layers of the conductors; and conductors with different widths are wound on the windings according to the widths of the stator slots (13). The motor efficiency can be improved, the temperature rise can be reduced, and research and development of a high-performance and high-quality motor can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a stator structure of flat wire windings with unequal linear widths and a motor using the same. Background Art

[0002] Compared with traditional round wire windings, flat wire windings have high slot fill rate and low DC resistance, and have efficiency advantages over round wire motors in the medium and low speed operation area. At the same time, the effective contact area with the stator is increased, the temperature rise of the winding is 10% lower than that of the round wire motor, and the heat dissipation and heat conduction are better. In recent years, it has been widely used in the fields of electric vehicles and hybrid vehicles. However, as the performance of electric vehicles continues to improve, the space of motors is constantly compressed, and the demand for further improving the efficiency and power density of motors under the same volume is also increasing. Although due to different uses, index requirements, and design ideas, the solutions of flat wire windings, especially the end forms, have been improved a lot, such as H-pin flat wire windings, Umini-pin flat wire windings, and X-pin flat wire windings, but the windings all use flat wire conductors with the same cross-sectional area. This structure mainly increases the output torque by increasing the current, and has the disadvantages of high motor copper loss, high heat generation, and low material utilization under low-speed and high-torque conditions. Summary of the invention

[0003] The present invention provides a stator structure of a flat wire winding with unequal linear widths, which reduces the phase resistance of the winding and the AC copper loss of the conductor at the slot, thereby improving the magnetic flux density of the core at the bottom of the slot and improving the utilization rate of the core material. This improves the motor efficiency and reduces the temperature rise, thereby realizing the research and development of high-performance and high-quality motors.

[0004] The present invention provides a motor, which is used for improving the motor slot full rate, lowering the resistance value, reducing the copper loss and improving the efficiency.

[0005] The present invention is achieved through the following technical solutions:

[0006] A stator structure of a flat wire winding with unequal linear width, the stator structure comprising a stator core, stator slots and windings;

[0007] The stator core is provided with stator slots 13 of different widths, two sides of the stator slots 13 are parallel, the bottom 11 of the stator slot is wide, and the middle 12 of the stator slot is narrow;

[0008] The ratio of the radial widening of the stator slot 13 is determined according to the ratio of the cross-sectional area to the number of conductor layers to the total number of conductor layers;

[0009] The winding is wound with conductors of different widths according to the width of the stator slots 13 .

[0010] Furthermore, the stator core includes a stator core tooth portion 14, a stator core yoke portion 15 and a stator slot 16.

[0011] Stator slots 13 of unequal width are formed between adjacent stator core teeth 14 , the outer ends of the bottoms 11 of the stator slots are stator core yokes 15 , and the inner ring of the stator core is provided with stator notches 16 , which are connected to the stator slots 13 of unequal width.

[0012] Furthermore, a conductor with a larger cross-sectional area is placed at the bottom 11 of the stator slot, and a conductor with a smaller cross-sectional area is placed at the middle 12 of the stator slot.

[0013] Furthermore, the conductors with larger cross-sectional areas are connected at their ends by welding to form a flat wire winding a.

[0014] Furthermore, the conductor with a smaller cross-sectional area is also welded at the end to form a flat wire winding b.

[0015] Furthermore, the flat wire winding a and the flat wire winding b are connected in series or in parallel at the winding outlet to form the winding of the motor. Current is passed through the phase winding to generate a stator magnetic field, which interacts with the rotor magnetic field to output electromagnetic torque.

[0016] Furthermore, the shape of the bottom 11 of the stator slot includes a pear shape, a rectangle, or a polygon with edges modified by rounding / chamfering.

[0017] Furthermore, the bottom 11 of the stator slot is made of aluminum, and the stator slot opening 16 is made of copper.

[0018] Furthermore, the bottom 11 of the stator slot is made of solid copper conductor, and the stator slot 16 is made of Litz wire flat wire, so as to reduce the AC loss of the conductor slot and reasonably distribute the AC and DC windings.

[0019] A motor adopts the stator structure of the flat wire winding with unequal linear width as mentioned above.

[0020] Beneficial effects of the present invention:

[0021] The stator winding of the present invention is supplied with current to generate a stator armature magnetic field. The winding is in the form of a flat wire winding, which can effectively improve the motor slot fill rate. Flat wire conductors with different cross-sectional areas are placed in the stator slots. Conductors with large cross-sectional areas are placed at the bottom of the slots to reduce the resistance value of the motor windings, and conductors with small cross-sectional areas are placed at the slot openings to suppress the AC copper loss of the conductors. The ends of the slots in the stator slots are connected by welding, and then the windings are connected in series or in parallel as needed to form motor windings. Compared with traditional motor windings with the same cross-sectional area, the structural windings proposed by the present invention have lower resistance values, smaller copper losses, and improved efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The stator core structure diagram of the present invention is a stator core structure diagram for placing flat wire windings of unequal linear widths.

[0023] Figure 2 This is a diagram for placing flat wire conductors of unequal width according to the present invention.

[0024] Figure 3 The present invention is a structural diagram of the stator of a permanent magnet synchronous motor with flat wire windings of unequal linear width.

[0025] Figure 4 In order to apply the present invention to a permanent magnet synchronous motor, a schematic diagram of the structure of a permanent magnet synchronous motor with flat wire windings of unequal linear width is obtained.

[0026] Figure 5 It is a schematic diagram of the structure of a traditional flat wire winding permanent magnet synchronous motor with equal linear width.

[0027] Figure 6 The output torque of a conventional flat wire winding permanent magnet synchronous motor with equal linear width and a flat wire winding permanent magnet synchronous motor with unequal linear width according to the present invention are compared under the same current.

[0028] Figure 7 This is an efficiency map of a permanent magnet synchronous motor with flat wire windings of unequal line width in an embodiment of the present invention.

[0029] Figure 8 This is an efficiency map of a conventional flat wire winding permanent magnet synchronous motor with equal linear width in an embodiment of the present invention.

[0030] Fig. 9 This is a map diagram of the difference in efficiency between two flat wire winding permanent magnet synchronous motors in an embodiment of the present invention.

[0031] Fig.10 Schematic diagram of replacing the flat conductor wire at the bottom with a Litz rectangular wire according to the present invention.

[0032] Fig.11 The present invention is a schematic diagram of converting a flat conductor into a flat square conductor with a smaller cross-sectional area and a Litz rectangular conductor.

[0033] In the figure, 11 is the bottom of the stator slot, 12 is the middle of the stator slot, 13 is the stator slot with varying width, 14 is the stator core tooth portion, 15 is the stator core yoke portion, 16 is the stator slot opening, 21 is a conductor with a larger cross-sectional area placed at the bottom of the stator slot, 22 is a conductor with a smaller cross-sectional area placed in the middle of the stator slot, 23 is a group of conductors placed in the stator slot, 31 is an N-pole permanent magnet, 32 is an S-pole permanent magnet, and 33 is a rotor core. DETAILED DESCRIPTION

[0034] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0035] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0036] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0037] The following is attached to this application specification Figure 1-11 , the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0039] Implementation Method 1

[0040] This embodiment provides a stator structure of a flat wire winding with unequal linear width, the stator structure comprises a stator core, stator slots and windings;

[0041] The stator core is provided with stator slots 13 of different widths, two sides of the stator slots 13 are parallel, the bottom 11 of the stator slot is wide, and the middle 12 of the stator slot is narrow;

[0042] The ratio of the radial widening of the stator slot 13 is determined according to the ratio of the cross-sectional area to the number of conductor layers to the total number of conductor layers;

[0043] The winding is wound with conductors of different widths according to the width of the stator slots 13 .

[0044] Furthermore, the stator core includes a stator core tooth portion 14, a stator core yoke portion 15 and a stator slot 16.

[0045] Stator slots 13 of unequal width are formed between adjacent stator core teeth 14 , the outer ends of the bottoms 11 of the stator slots are stator core yokes 15 , and the inner ring of the stator core is provided with stator notches 16 , which are connected to the stator slots 13 of unequal width.

[0046] Furthermore, a conductor with a larger cross-sectional area is placed at the bottom 11 of the stator slot, and a conductor with a smaller cross-sectional area is placed at the middle 12 of the stator slot.

[0047] Furthermore, the conductors with larger cross-sectional areas are connected at their ends by welding to form a flat wire winding a.

[0048] Furthermore, the conductor with a smaller cross-sectional area is also welded at the end to form a flat wire winding b.

[0049] Furthermore, the flat wire winding a and the flat wire winding b are connected in series or in parallel at the winding outlet to form the winding of the motor. Current is passed through the phase winding to generate a stator magnetic field, which interacts with the rotor magnetic field to output electromagnetic torque.

[0050] Furthermore, the shape of the bottom 11 of the stator slot includes a pear shape, a rectangle, or a polygon with edges modified by rounding / chamfering.

[0051] Furthermore, the bottom 11 of the stator slot is made of aluminum, and the stator slot opening 16 is made of copper, so as to reduce the cost and weight of the motor and improve the power density;

[0052] The bottom 11 of the stator slot is made of solid copper conductor, and the stator slot 16 is made of Litz wire flat wire, so as to reduce the AC loss of the conductor slot and reasonably distribute the AC and DC windings of the windings.

[0053] Specifically, the width of the stator slot is increased from the bottom of the stator slot to the stator slot opening, rather than from the stator slot opening to the inside of the stator slot. Because after the width inside the stator slot is increased, the cross-sectional area of ​​the flat wire conductor at the bottom of the stator slot can be increased, reducing the resistance value and DC copper loss of the winding. At the same time, compared with the bottom of the stator slot, the narrow width of the stator slot opening can place conductors with small cross-sectional areas, which is beneficial for suppressing the AC loss of the flat wire conductor.

[0054] Flat wire conductors of unequal width are placed inside the stator slots of unequal width. The space from the bottom of the stator slot to the middle of the stator slot is large. Under the condition that the insulation thickness of the insulating paper and the conductor in the slot is the same, the area ratio of copper can be increased, that is, a flat wire conductor with a larger copper cross-sectional area is placed. The space from the middle of the stator slot to the stator slot opening is small. Similarly, under the condition that the insulation thickness of the insulating paper and the conductor in the slot is the same, the area ratio of copper is reduced, that is, a conductor with a small cross-sectional area is placed.

[0055] The stator slot bottom and stator slot opening can be placed with any layers of conductors according to the motor design requirements. Specifically, the present invention provides an example of 8 layers of flat wires in the slot, 4 layers of conductors with large cross-sectional areas are placed at the stator slot bottom, and 4 layers of conductors with small cross-sectional areas are placed at the stator slot opening.

[0056] Two layers of conductors with large cross-sectional areas can also be placed at the bottom of the stator slot, and six layers of conductors with small cross-sectional areas can be placed at the stator slot opening. Alternatively, six layers of conductors with large cross-sectional areas can be placed at the bottom of the stator slot, and two layers of conductors with small cross-sectional areas can be placed at the stator slot opening. That is, the widened area of ​​the stator slot can be determined according to the number of conductor layers. In this scheme, in order to place four layers of conductors with large cross-sectional areas, the width of the stator slot is widened to 1 / 2 of the slot depth in the radial direction from the bottom of the stator slot to the stator slot opening, as shown in FIG. Figure 1 shown.

[0057] In this embodiment, in order to place four layers of conductors with large cross-sectional areas, the stator slot width is widened to 1 / 2 of the slot depth in the radial direction from the stator slot bottom to the stator slot opening. Figure 1 Similarly, for a winding with a total of 8 conductor layers, when 2 layers of conductors with large cross-sectional areas are placed, the stator slot width needs to be widened to 1 / 4 of the slot depth in the radial direction from the stator slot bottom to the stator slot opening. When 6 layers of conductors with large cross-sectional areas are placed, the stator slot width needs to be widened to 3 / 4 of the slot depth in the radial direction from the stator slot bottom to the stator slot opening.

[0058] Flat wire conductors with different cross-sectional areas are placed in the stator slots. Compared with the traditional conductor placement method, the placement of flat wire conductors with different areas can first increase the cross-sectional area of ​​the conductor, reduce the resistance value of the winding, and reduce the AC and DC copper loss of the motor. Secondly, placing conductors with small cross-sectional areas at the stator slots can suppress the AC loss of the flat wire conductors. In addition, the widening of the inside of the stator slot increases the magnetic density of the stator core yoke under the same excitation current, thereby improving the utilization rate of the stator core material. Therefore, the use of stator slots with unequal widths and flat wire windings with unequal widths can improve the efficiency and overall performance of the motor.

[0059] Figure 5 It is a schematic diagram of the structure of a conventional flat wire winding permanent magnet synchronous motor with equal linear width, and is used for comparison with the flat wire winding permanent magnet synchronous motor with unequal linear width of the present invention.

[0060] Figure 6The output torque of the conventional flat wire winding permanent magnet synchronous motor with equal linear width and the flat wire winding permanent magnet synchronous motor with unequal linear width under the same current is compared. It can be seen that compared with the flat wire winding permanent magnet synchronous motor with equal linear width, the motor output torque of the motor proposed by the present invention is slightly reduced.

[0061] Fig. 9 This is a map of the difference in efficiency between two flat wire winding permanent magnet synchronous motors in the implementation case of the present invention. It can be seen from the figure that under most operating conditions of electric vehicles, the use of a flat wire winding stator structure with unequal linear width can effectively improve the efficiency of the motor.

[0062] like Figure 1 As shown, the stator structure of the present invention is composed of a stator slot bottom 11, a stator slot middle 12, a stator slot with a variable width 13, a stator core tooth portion 14, a stator core yoke portion 15, and a stator slot opening 16.

[0063] The unequal width stator slot type can change the width of the stator slot bottom and the width of the middle part of the stator according to design requirements.

[0064] like Figure 2 As shown, the flat wire conductor 23 of unequal width of the present invention comprises a conductor 21 with a larger cross-sectional area placed at the bottom of the stator slot and a conductor 22 with a smaller cross-sectional area placed in the middle of the stator slot.

[0065] The number of conductor layers with larger cross-sectional areas and the number of conductor layers with smaller cross-sectional areas can be changed according to design requirements.

[0066] like Figure 3 As shown, the stator structure of the permanent magnet synchronous motor with linear unequal width flat wire windings of the present invention is composed of a stator core including slots of unequal width and flat wire conductors of unequal width.

[0067] like Figure 4 As shown, the present invention is applied to a permanent magnet synchronous motor with a flat wire winding having unequal linear widths that can be obtained in the permanent magnet synchronous motor.

[0068] The motor rotor can be replaced with a rotor type of other structure as needed.

[0069] Implementation Method 2

[0070] This embodiment provides a motor, which adopts a stator structure of a flat wire winding with unequal linear width as described in the first embodiment.

[0071] The stator structure comprises a stator core, stator slots and windings;

[0072] The stator core is provided with stator slots 13 of different widths, two sides of the stator slots 13 are parallel, the bottom 11 of the stator slot is wide, and the middle 12 of the stator slot is narrow;

[0073] The ratio of the radial widening of the stator slot 13 is determined according to the ratio of the cross-sectional area to the number of conductor layers to the total number of conductor layers;

[0074] The winding is wound with conductors of different widths according to the width of the stator slots 13 .

[0075] Furthermore, the stator core includes a stator core tooth portion 14, a stator core yoke portion 15 and a stator slot 16.

[0076] Stator slots 13 of unequal width are formed between adjacent stator core teeth 14 , the outer ends of the bottoms 11 of the stator slots are stator core yokes 15 , and the inner ring of the stator core is provided with stator notches 16 , which are connected to the stator slots 13 of unequal width.

[0077] Furthermore, a conductor with a larger cross-sectional area is placed at the bottom 11 of the stator slot, and a conductor with a smaller cross-sectional area is placed at the middle 12 of the stator slot.

[0078] Furthermore, the conductors with larger cross-sectional areas are connected at their ends by welding to form a flat wire winding a.

[0079] Furthermore, the conductor with a smaller cross-sectional area is also welded at the end to form a flat wire winding b.

[0080] Furthermore, the flat wire winding a and the flat wire winding b are connected in series or in parallel at the winding outlet to form the winding of the motor. Current is passed through the phase winding to generate a stator magnetic field, which interacts with the rotor magnetic field to output electromagnetic torque.

[0081] Furthermore, the shape of the bottom 11 of the stator slot includes a pear shape, a rectangle, or a polygon with edges modified by rounding / chamfering.

[0082] Furthermore, the bottom 11 of the stator slot is made of aluminum, and the stator slot opening 16 is made of copper, so as to reduce the cost and weight of the motor and improve the power density;

[0083] The bottom 11 of the stator slot is made of solid copper conductor, and the stator slot 16 is made of Litz wire flat wire, so as to reduce the AC loss of the conductor slot and reasonably distribute the AC and DC windings of the windings.

[0084] Figure 5 It is a schematic diagram of the structure of a conventional flat wire winding permanent magnet synchronous motor with equal linear width, and is used for comparison with the flat wire winding permanent magnet synchronous motor with unequal linear width of the present invention.

[0085] Figure 6The output torque of the conventional flat wire winding permanent magnet synchronous motor with equal linear width and the flat wire winding permanent magnet synchronous motor with unequal linear width under the same current is compared. It can be seen that compared with the flat wire winding permanent magnet synchronous motor with equal linear width, the motor output torque of the motor proposed by the present invention is slightly reduced.

[0086] Fig. 9 This is a map of the difference in efficiency between two flat wire winding permanent magnet synchronous motors in the implementation case of the present invention. It can be seen from the figure that under most operating conditions of electric vehicles, the use of a flat wire winding stator structure with unequal linear width can effectively improve the efficiency of the motor.

[0087] The stator structure of the permanent magnet synchronous motor with flat wire windings of unequal linear width proposed by the present invention can effectively reduce the AC and DC copper loss of the conductor, improve the motor operation efficiency, and thus reduce the motor temperature rise and improve the motor performance without sacrificing much motor output torque.

[0088] Implementation Method 3

[0089] This embodiment provides a permanent magnet synchronous motor, which adopts a stator structure of a flat wire winding with unequal linear width as described in the first embodiment.

[0090] The stator structure comprises a stator core, stator slots and windings;

[0091] The stator core is provided with stator slots 13 of different widths, two sides of the stator slots 13 are parallel, the bottom 11 of the stator slot is wide, and the middle 12 of the stator slot is narrow;

[0092] The ratio of the radial widening of the stator slot 13 is determined according to the ratio of the cross-sectional area to the number of conductor layers to the total number of conductor layers;

[0093] The winding is wound with conductors of different widths according to the width of the stator slots 13 .

[0094] Furthermore, the stator core includes a stator core tooth portion 14, a stator core yoke portion 15 and a stator slot 16.

[0095] Stator slots 13 of unequal width are formed between adjacent stator core teeth 14 , the outer ends of the bottoms 11 of the stator slots are stator core yokes 15 , and the inner ring of the stator core is provided with stator notches 16 , which are connected to the stator slots 13 of unequal width.

[0096] Furthermore, a conductor with a larger cross-sectional area is placed at the bottom 11 of the stator slot, and a conductor with a smaller cross-sectional area is placed at the middle 12 of the stator slot.

[0097] Furthermore, the conductors with larger cross-sectional areas are connected at their ends by welding to form a flat wire winding a.

[0098] Furthermore, the conductor with a smaller cross-sectional area is also welded at the end to form a flat wire winding b.

[0099] Furthermore, the flat wire winding a and the flat wire winding b are connected in series or in parallel at the winding outlet to form the winding of the motor. Current is passed through the phase winding to generate a stator magnetic field, which interacts with the rotor magnetic field to output electromagnetic torque.

[0100] Furthermore, the shape of the bottom 11 of the stator slot includes a pear shape, a rectangle, or a polygon with edges modified by rounding / chamfering.

[0101] Furthermore, the bottom 11 of the stator slot is made of aluminum, and the stator slot opening 16 is made of copper, so as to reduce the cost and weight of the motor and improve the power density;

[0102] The bottom 11 of the stator slot is made of solid copper conductor, and the stator slot 16 is made of Litz wire flat wire, so as to reduce the AC loss of the conductor slot and reasonably distribute the AC and DC windings of the windings.

[0103] Specifically, current is passed through the stator winding to generate a stator armature magnetic field. The winding is in the form of a flat wire winding, which can effectively improve the motor slot fill rate. Flat wire conductors with different cross-sectional areas are placed in the stator slots. Conductors with large cross-sectional areas are placed at the bottom of the slots to reduce the resistance of the motor windings, and conductors with small cross-sectional areas are placed at the slot mouths to suppress the AC copper loss of the conductors. The ends of the slots in the stator slots are connected by welding, and then the windings are connected in series or in parallel as needed to form motor windings. Compared with traditional motor windings with the same cross-sectional area, the structural windings proposed in the present invention have lower resistance values, smaller copper losses, and improved efficiency.

Claims

1. A stator structure of a flat wire winding with unequal linear width, characterized in that: The stator structure comprises a stator core, stator slots and windings; The stator core is provided with stator slots (13) of unequal widths, the two sides of the stator slots (13) are parallel, the bottom (11) of the stator slots is wide, and the middle (12) of the stator slots is narrow; The ratio of the radial widening of the stator slot (13) is determined according to the ratio of the cross-sectional area to the number of conductor layers to the total number of conductor layers; The winding is wound with conductors of different widths according to the width of the stator slot (13).

2. The stator structure according to claim 1, characterized in that: The stator core comprises a stator core tooth portion (14), a stator core yoke portion (15) and a stator slot (16). Stator slots (13) of unequal width are provided between adjacent stator core teeth (14); the outer ends of the bottoms (11) of the stator slots are stator core yokes (15); the inner ring of the stator core is provided with stator slot openings (16); and the stator slot openings (16) are connected to the stator slots (13) of unequal width.

3. The stator structure according to claim 1, characterized in that: A conductor with a larger cross-sectional area is placed at the bottom (11) of the stator slot, and a conductor with a smaller cross-sectional area is placed at the middle (12) of the stator slot.

4. The stator structure according to claim 3, characterized in that: The conductors with larger cross-sectional areas are connected at their ends by welding to form a flat wire winding a.

5. The stator structure according to claim 3, characterized in that: The conductor with a smaller cross-sectional area is also welded at the end to form a flat wire winding b.

6. The stator structure according to claim 4, characterized in that: The flat wire winding a and the flat wire winding b are connected in series or in parallel at the winding outlet ends to form the winding of the motor.

7. The stator structure according to claim 1, characterized in that: The shape of the bottom (11) of the stator slot includes a pear shape, a rectangle or a polygon with edges modified by rounding / chamfering.

8. The stator structure according to claim 2, characterized in that: The bottom (11) of the stator slot is made of aluminum, and the stator slot opening (16) is made of copper.

9. The stator structure according to claim 3, characterized in that: The bottom (11) of the stator slot is made of solid copper conductor, and the stator slot opening (16) is made of Litz wire flat wire.

10. A motor, characterized in that: The motor adopts a stator structure of a flat wire winding with unequal linear width as described in any one of claims 1-8.

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