Flat wire motor stator and flat wire motor

Abstract

The utility model relates to a flat wire motor stator and a flat wire motor. The flat wire motor stator comprises a winding coil and a stator iron core, a plurality of iron core grooves are formed in the inner side of the stator iron core; the hairpin wires are inserted and positioned in the iron core grooves, and the multiple hairpin wires in each iron core groove are arranged layer by layer in the radial direction. The hairpin wire comprises a single wire type and a double wire type. The wire body comprises a straight section, a positioning section and a welding section. The hairpin wires are connected through star point copper bars after being welded; all the hairpin wires form a plurality of parallel branches in the winding coil; the single hairpin wire comprises a first hairpin; the double-hairpin lead comprises a second hairpin, a third hairpin, a fourth hairpin, a fifth hairpin, a sixth hairpin and a seventh hairpin; and the insulation paper is arranged between the iron core groove and the winding coil. According to the utility model, magnetic linkages among the branches can be ensured to be completely symmetrical under different parallel branches, ring current among the plurality of parallel branches of each phase winding is avoided, additional loss is avoided, and the working efficiency of the flat wire motor is improved.

Description

Technical Field

[0001] The utility model relates to the field of motors, and particularly to a flat wire motor stator and a flat wire motor. Background Art

[0002] With the gradual depletion of oil resources and the increasing requirements of society for greenhouse gas emissions, new energy vehicles have begun to come into everyone's view. Among them, as a kind of motor for new energy vehicles, the flat wire motor is more and more widely used in new energy vehicles because of its advantages such as high efficiency, good heat dissipation and good vibration resistance.

[0003] With the development of motor controller technology, the switching frequency that the motor can use has also been greatly improved. The drive motor can adapt to more pole numbers and slot numbers, and different combinations of pole numbers and slot numbers can form different coil turns, making the product more applicable.

[0004] In the fields of electromagnetic coil design and power electronic device design, the performance and stability of the motor are crucial. The performance of the motor mainly depends on the internal magnetic field distribution, and the magnetic field distribution is affected by the layout and connection mode of the coils. In addition, the stability of the motor is also affected by the loop current. Excessive loop current may lead to a decrease in the performance of the motor and even damage to the motor. Therefore, how to design a motor with a compact structure, high efficiency and effective reduction of loop current is an important topic in the field of motor design.

[0005] The existing solutions mainly improve the performance and stability of the motor by optimizing the layout and connection mode of the coils and improving the magnetic circuit design of the motor. For example, by changing the winding order and connection mode of the coils, the connection between the coils can be made more concise, thereby reducing the manufacturing difficulty and production cost. At the same time, by adjusting the pole distribution of the motor and the arrangement mode of the stator slots, the magnetic field distribution inside the motor can be made more uniform, thereby reducing the loop current and improving the performance and stability of the motor.

[0006] However, the above-mentioned existing technical solutions still have some problems in practical applications:

[0007] First, the existing coil connection methods are often relatively complex, which not only increases the manufacturing difficulty but also raises the production cost.

[0008] Second, although the existing magnetic circuit design can reduce the loop current to a certain extent, in practical applications, there is still a problem of excessive loop current, which may affect the performance and stability of the motor.

[0009] Therefore, how to solve the deficiencies of the above-mentioned existing technologies has become the research topic of the present utility model. Summary of the Utility Model

[0010] The object of the present utility model is to provide a flat wire motor stator and a flat wire motor.

[0011] To achieve the above object, the technical solution adopted by the present utility model is:

[0012] A flat wire motor stator includes a winding coil and a stator core;

[0013] The winding coil includes a star point copper bar and several hairpin conductors; the winding coil is a three-phase winding of U, V, and W, and the three-phase connection methods are the same;

[0014] On the inner side of the stator core, a plurality of core slots are evenly spaced in the circumferential direction. The slot depth of each core slot corresponds to the radial direction of the stator core, and the slot length corresponds to the axial direction of the stator core;

[0015] The hairpin conductors are axially inserted and positioned in the core slots along the stator core. The multiple hairpin conductors in each core slot are arranged layer by layer in the radial direction of the stator core;

[0016] The hairpin conductors include single-root type and double-root type. The single-root type hairpin conductor is composed of a single wire body, and the double-root type hairpin conductor is composed of two wire bodies that are spaced apart and connected at the upper ends; each wire body includes a straight section inserted into the core slot, a positioning section connected to the upper end of the straight section, and a welding section connected to the lower end of the straight section; the positioning section and the welding section are respectively exposed at both axial ends of the stator core; the welding sections of the hairpin conductors are connected through the star point copper bar after welding for U, V, and W; all the hairpin conductors form multiple parallel branches in the winding coil;

[0017] Among them, the single-root type hairpin conductor includes a first hairpin;

[0018] The double-root type hairpin conductors include a second hairpin, a third hairpin, a fourth hairpin, a fifth hairpin, a sixth hairpin, and a seventh hairpin, and in order from largest to smallest according to the distance between the straight sections of the two wire bodies are: the seventh hairpin, the third hairpin, the fifth hairpin, the fourth hairpin, the sixth hairpin, the second hairpin;

[0019] It further includes insulating paper, which is arranged between the core slot and the winding coil.

[0020] In the above solution, the winding coil is composed of all the hairpin conductors inserted and positioned in the stator core and the star point copper bar connecting the hairpin conductors.

[0021] In a further technical solution, the number of the core slots is 72, and the included angle between the center lines of the slot depths of two adjacent core slots is 5°.

[0022] Further technical solution: The two wire bodies of the second hairpin straddle 6 iron core slots, and the included angle between the center lines of the iron core slots where the two wire bodies are located is 25°; the two wire bodies of the third hairpin straddle 8 iron core slots, and the included angle between the center lines of the iron core slots where the two wire bodies are located is 35°; the two wire bodies of the fourth hairpin straddle 7 iron core slots, and the included angle between the center lines of the iron core slots where the two wire bodies are located is 30°; the two wire bodies of the fifth hairpin straddle 7 iron core slots, and the included angle between the center lines of the iron core slots where the two wire bodies are located is 30°; the two wire bodies of the sixth hairpin straddle 8 iron core slots, and the included angle between the center lines of the iron core slots where the two wire bodies are located is 35°; the two wire bodies of the seventh hairpin straddle 6 iron core slots, and the included angle between the center lines of the iron core slots where the two wire bodies are located is 25°.

[0023] Further technical solution: There are 6 layers of hairpin wires inserted in the iron core slots, which are the 1st to 6th layers from the inside to the outside; when the winding coil is a 2-way winding:

[0024] The first hairpin is inserted into the 1st layer of the 1st to 12th iron core slots, with a total of 12 roots;

[0025] The second hairpin is inserted into the 1st layer of the iron core slots. Among them, the first straight section is inserted into the 1st layer of the (14 + 13*n + 2*m)th slot, and the second straight section is inserted into the 1st layer of the (19 + 13*n + 2*m)th slot, where m = 0, 1, 2 and n = 0, 1, 2, 3, 4;

[0026] The third hairpin is inserted into the 1st layer of the iron core slots. Among them, the first straight section is inserted into the 1st layer of the (13 + 13*n + 2*m)th slot, and the second straight section is inserted into the 1st layer of the (20 + 13*n + 2*m)th slot, where m = 0, 1, 2 and n = 0, 1, 2, 3, 4;

[0027] The fourth hairpin is inserted into the 2nd and 3rd layers of the iron core slots. Among them, the first straight section is inserted into the 3rd layer of the 1st to 72nd slots, and the second straight section is inserted into the 2nd layer of the 1st to 72nd slots;

[0028] The fifth hairpin is inserted into the 4th and 5th layers of the iron core slots. Among them, the first straight section is inserted into the 5th layer of the 1st to 72nd slots, and the second straight section is inserted into the 4th layer of the 1st to 72nd slots;

[0029] The sixth hairpin is inserted into the 6th layer of the iron core slots. Among them, the first straight section is inserted into the 6th layer of the (1 + 13*k + 2*m)th slot, and the second straight section is inserted into the 6th layer of the (8 + 13*k + 2*m)th slot, where m = 0, 1, 2 and k = 0, 1, 2, 3, 4, 5;

[0030] The seventh hairpin is inserted into the 6th layer of the iron core slot, where the first straight section is inserted into the 6th layer of the slot numbered 2 + 13*k + 2*m, and the second straight section is inserted into the 6th layer of the slot numbered 7 + 13*k + 2*m, where m = 0, 1, 2 and k = 0, 1, 2, 3, 4, 5.

[0031] In a further technical solution, there are 6 layers of hairpin wires inserted into the iron core slot, which are numbered 1 to 6 from the inside to the outside; when the winding coil is a 3-way winding:

[0032] The first hairpin is inserted into the 1st layer of the iron core slots numbered 1 + 2m, 19 + 2m, 26 + 2m, 44 + 2m, 49 + 2m, and 67 + 2m, a total of 18 pieces, where m = 0, 1, 2;

[0033] The second hairpin is inserted into the 1st layer of the iron core slot, where the first straight section is inserted into the 1st layer of the slot numbered 8 + 13*n + 2*m, and the second straight section is inserted into the 1st layer of the slot numbered 13 + 13*n + 2*m, where m = 0, 1, 2 and n = 0, 1, 2, 3, 4;

[0034] The third hairpin is inserted into the 1st layer of the iron core slot, where the first straight section is inserted into the 1st layer of the slot numbered 7 + 13*n + 2*m, and the second straight section is inserted into the 1st layer of the slot numbered 14 + 13*n + 2*m, where m = 0, 1, 2 and n = 0, 1, 2, 3, 4;

[0035] The fourth hairpin is inserted into the 2nd and 3rd layers of the iron core slot, where the first straight section is inserted into the 3rd layer of the slot numbered 1 - 72, and the second straight section is inserted into the 2nd layer of the slot numbered 1 - 72;

[0036] The fifth hairpin is inserted into the 4th and 5th layers of the iron core slot, where the first straight section is inserted into the 5th layer of the slot numbered 1 - 72, and the second straight section is inserted into the 4th layer of the slot numbered 1 - 72;

[0037] The sixth hairpin is inserted into the 6th layer of the iron core slot, where the first straight section is inserted into the 6th layer of the slot numbered 1 + 13*k + 2*m, and the second straight section is inserted into the 6th layer of the slot numbered 8 + 13*k + 2*m, where m = 0, 1, 2 and k = 0, 1, 2, 3, 4, 5;

[0038] The seventh hairpin is inserted into the 6th layer of the iron core slot, where the first straight section is inserted into the 6th layer of the slot numbered 2 + 13*k + 2*m, and the second straight section is inserted into the 6th layer of the slot numbered 7 + 13*k + 2*m, where m = 0, 1, 2 and k = 0, 1, 2, 3, 4, 5.

[0039] In a further technical solution, there are 6 layers of hairpin wires inserted into the iron core slot, which are numbered 1 to 6 from the inside to the outside; when the winding coil is a 4-way winding:

[0040] The first hairpin is inserted into the 1st and 6th layers of the iron core slots, with a total of 24 pieces. Among them, 12 pieces are inserted into the 1st layer of the slots numbered 1 + 2m, 2 + 2m, 31 + 2m, and 32 + 2m, and 12 pieces are inserted into the 2nd layer of the slots numbered 25 + 2m, 26 + 2m, 67 + 2m, and 68 + 2m, where m = 0, 1, 2;

[0041] The second hairpin is inserted into the 1st layer of the iron core slots. Among them, the first straight section is inserted into the 1st layer of the slot numbered 8 + 13*n + 2*m, and the second straight section is inserted into the 1st layer of the slot numbered 13 + 13*n + 2*m, where m = 0, 1, 2, and n = 0, 1, 2, 3, 4;

[0042] The third hairpin is inserted into the 1st layer of the iron core slots. Among them, the first straight section is inserted into the 1st layer of the slot numbered 7 + 13*n + 2*m, and the second straight section is inserted into the 1st layer of the slot numbered 14 + 13*n + 2*m, where m = 0, 1, 2, and n = 0, 1, 2, 3, 4;

[0043] The fourth hairpin is inserted into the 2nd and 3rd layers of the iron core slots. Among them, the first straight section is inserted into the 3rd layer of the slots numbered 1 - 72, and the second straight section is inserted into the 2nd layer of the slots numbered 1 - 72;

[0044] The fifth hairpin is inserted into the 4th and 5th layers of the iron core slots. Among them, the first straight section is inserted into the 5th layer of the slots numbered 1 - 72, and the second straight section is inserted into the 4th layer of the slots numbered 1 - 72;

[0045] The sixth hairpin is inserted into the 6th layer of the iron core slots. Among them, the first straight section is inserted into the 6th layer of the slot numbered 1 + 13*k + 2*m, and the second straight section is inserted into the 6th layer of the slot numbered 8 + 13*k + 2*m, where m = 0, 1, 2, and k = 0, 1, 2, 3, 4, 5;

[0046] The seventh hairpin is inserted into the 6th layer of the iron core slots. Among them, the first straight section is inserted into the 6th layer of the slot numbered 2 + 13*k + 2*m, and the second straight section is inserted into the 6th layer of the slot numbered 7 + 13*k + 2*m, where m = 0, 1, 2, and k = 0, 1, 2, 3, 4, 5.

[0047] The present utility model also discloses a flat wire motor, which includes the flat wire motor stator and a rotor, and the rotor is coaxially arranged inside the flat wire motor stator.

[0048] In a further technical solution, the number of poles of the flat wire motor is twelve.

[0049] Regarding the use of "first", "second", etc. in this article, it does not particularly refer to the meaning of order or sequence, nor is it used to limit this case. It is only used to distinguish components or operations described with the same technical terms.

[0050] Regarding the "connection" or "positioning" used in this article, it can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other. It can also refer to two or more components or devices operating or acting on each other.

[0051] Regarding the "including", "comprising", "having", etc. used in this article, they are all open-ended terms, meaning including but not limited to.

[0052] Regarding the terms used in this article, unless otherwise specified, they usually have their ordinary meanings in this field, in the context of this case, and in the specific context. Some terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of this case.

[0053] Regarding the "front", "rear", "upper", "lower", "left", "right", etc. used in this article, they are all directional terms. In this case, they are only used to illustrate the positional relationship between various structures, and are not used to limit the specific direction of the protection scheme of this case and during actual implementation.

[0054] The working principle and advantages of the present utility model are as follows:

[0055] Compared with the prior art, the present utility model simplifies the winding structure at the end of the stator. This winding structure can ensure that the magnetic fluxes between various branches are completely symmetric under different parallel branches. During the operation of the motor, the difference in the induced electromotive forces generated between various branches is zero, thereby avoiding the generation of circulating currents between multiple parallel branches of each phase winding, avoiding additional losses, and improving the working efficiency of the flat wire motor.

[0056] Each phase winding of the present utility model can have different numbers of parallel branches, that is, the three phases U, V, and W can all be two-branch, three-branch, and four-branch at the same time. Thus, different motor turns can be designed correspondingly, improving the structural compactness, and further meeting the performance requirements of different voltage platforms and powers of permanent magnet synchronous motors for commercial vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] FIG. Figure 1 is a schematic structural diagram of the stator of the flat wire motor according to an embodiment of the present utility model;

[0058] FIG. Figure 2 is a schematic structural diagram of the winding coil according to an embodiment of the present utility model;

[0059] FIG. Figure 3 is a top view of the structural diagram of the stator core according to an embodiment of the present utility model;

[0060] FIG. Figure 4 is a schematic structural diagram of the first hairpin according to an embodiment of the present utility model;

[0061] Appendix Figure 5 This is a schematic structural diagram of the second hairpin in the embodiment of the present utility model;

[0062] Appendix Figure 6 This is a schematic structural diagram of the third hairpin in the embodiment of the present utility model;

[0063] Appendix Figure 7 This is a schematic structural diagram of the fourth hairpin in the embodiment of the present utility model;

[0064] Appendix Figure 8 This is a schematic structural diagram of the fifth hairpin in the embodiment of the present utility model;

[0065] Appendix Figure 9 This is a schematic structural diagram of the sixth hairpin in the embodiment of the present utility model;

[0066] Appendix Figure 10 This is a schematic structural diagram of the seventh hairpin in the embodiment of the present utility model;

[0067] Appendix Figure 11 This is a schematic diagram of the magnetic flux linkage waveform when each branch is not completely symmetric in the comparative example with two branches;

[0068] Appendix Figure 12 This is a winding diagram of the present utility model embodiment with two branches;

[0069] Appendix Figure 13 This is a schematic diagram of the magnetic flux linkage waveform when each branch is completely symmetric in the present utility model embodiment with two branches;

[0070] Appendix Figure 14 This is a schematic diagram of the magnetic flux linkage waveform when each branch is not completely symmetric in the comparative example with three branches;

[0071] Appendix Figure 15 This is a winding diagram of the present utility model embodiment with three branches;

[0072] Appendix Figure 16 This is a schematic diagram of the magnetic flux linkage waveform when each branch is completely symmetric in the present utility model embodiment with three branches;

[0073] Appendix Figure 17 This is a schematic diagram of the magnetic flux linkage waveform when each branch is not completely symmetric in the comparative example with four branches;

[0074] Appendix Figure 18 This is a winding diagram of the present utility model embodiment with four branches;

[0075] Appendix Figure 19 This is a schematic diagram of the magnetic flux linkage waveform when each branch is completely symmetric in the present utility model embodiment with four branches.

[0076] In the above drawings: 1. winding coil; 11. star point copper bar; 12. first hairpin; 121. positioning section of the first hairpin; 122. straight section of the first hairpin; 123. welding section of the first hairpin; 13. second hairpin; 131. first positioning section of the second hairpin; 132. first straight section of the second hairpin; 133. first welding section of the second hairpin; 134. second positioning section of the second hairpin; 135. second straight section of the second hairpin; 136. second welding section of the second hairpin; 14. third hairpin; 141. first positioning section of the third hairpin; 142. first straight section of the third hairpin; 143. first welding section of the third hairpin; 144. second positioning section of the third hairpin; 145. second straight section of the third hairpin; 146. second welding section of the third hairpin; 15. fourth hairpin; 151. first positioning section of the fourth hairpin; 152. first straight section of the fourth hairpin; 153. first welding section of the fourth hairpin; 154. second positioning section of the fourth hairpin; 155. second straight section of the fourth hairpin; 156. second welding section of the fourth hairpin; 16. fifth hairpin; 161. first positioning section of the fifth hairpin; 162. first straight section of the fifth hairpin; 163. first welding section of the fifth hairpin; 164. second positioning section of the fifth hairpin; 165. second straight section of the fifth hairpin; 166. second welding section of the fifth hairpin; 17. sixth hairpin; 171. first positioning section of the sixth hairpin; 172. first straight section of the sixth hairpin; 173. first welding section of the sixth hairpin; 174. second positioning section of the sixth hairpin; 175. second straight section of the sixth hairpin; 176. second welding section of the sixth hairpin; 18. seventh hairpin; 181. first positioning section of the seventh hairpin; 182. first straight section of the seventh hairpin; 183. first welding section of the seventh hairpin; 184. second positioning section of the seventh hairpin; 185. second straight section of the seventh hairpin; 186. second welding section of the seventh hairpin; 2. stator core; 21. core slot. Detailed implementation mode

[0077] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0078] Embodiment: The present case will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present case, any person skilled in the art can make changes and modifications to the techniques taught by the present case without departing from the spirit and scope of the present case.

[0079] The terms used in this article are only for describing specific embodiments and are not intended to limit the present case. Singular forms such as "a", "this", "this", "the present", and "the" also include plural forms as used in this article.

[0080] Refer to the attached Figures 1 - 3 As shown, a flat wire motor stator includes a winding coil 1 and a stator core 2.

[0081] The winding coil 1 includes a neutral copper bar 11 and several hairpin conductors. Specifically, the winding coil 1 is composed of all the hairpin conductors inserted and positioned in the stator core 2 and the neutral copper bar 11 connecting each hairpin conductor. The winding coil 1 is a three-phase winding of U, V, and W, and the three-phase connection methods are the same.

[0082] A plurality of core slots 21 are evenly spaced in the circumferential direction on the inner side of the stator core 2. The groove depth of each core slot 21 corresponds to the radial direction of the stator core 2, and the groove length corresponds to the axial direction of the stator core 2. The number of the core slots (21) is 72, and the included angle between the center lines of the groove depths of two adjacent core slots (21) is 5°.

[0083] The hairpin conductors are inserted and positioned in the core slots 21 along the axial direction of the stator core 2. After all the hairpin conductors are inserted, the multiple hairpin conductors in each core slot 21 are arranged layer by layer along the radial direction of the stator core 2.

[0084] An insulating paper 3 is further included and is disposed between the core slot 21 and the hairpin conductor.

[0085] The hairpin conductors include single-root type and double-root type. The single-root type hairpin conductor is composed of a single wire body, and the double-root type hairpin conductor is composed of two wire bodies arranged at intervals and connected at the upper ends. Each wire body includes a straight section inserted into the core slot 21, a positioning section connected to the upper end of the straight section, and a welding section connected to the lower end of the straight section; the positioning section and the welding section are respectively exposed at both axial ends of the stator core 2; the welding sections of the hairpin conductors are welded and U, V, and W are connected through the neutral copper bar 11; all the hairpin conductors form a plurality of parallel branches in the winding coil 1.

[0086] Among them, as Figure 4 shown, the single-root type hairpin conductor includes a first hairpin 12, and the first hairpin 12 successively includes a positioning section 121 of the first hairpin, a straight section 122 of the first hairpin, and a welding section 123 of the first hairpin from top to bottom.

[0087] The double-root type hairpin conductors include a second hairpin 13, a third hairpin 14, a fourth hairpin 15, a fifth hairpin 16, a sixth hairpin 17, and a seventh hairpin 18, and in order from largest to smallest according to the distance between the straight sections of the two wire bodies: the seventh hairpin 18, the third hairpin 14, the fifth hairpin 16, the fourth hairpin 15, the sixth hairpin 17, and the second hairpin 13.

[0088] As Figure 5As shown, the second hairpin 13 includes a first positioning section 131 of the second hairpin, a first straight section 132 of the second hairpin, a first welding section 133 of the second hairpin, a second positioning section 134 of the second hairpin, a second straight section 135 of the second hairpin, and a second welding section 136 of the second hairpin.

[0089] As Figure 6 shown, the third hairpin 14 includes a first positioning section 141 of the third hairpin, a first straight section 142 of the third hairpin, a first welding section 143 of the third hairpin, a second positioning section 144 of the third hairpin, a second straight section 145 of the third hairpin, and a second welding section 146 of the third hairpin.

[0090] As Figure 7 shown, the fourth hairpin 15 includes a first positioning section 151 of the fourth hairpin, a first straight section 152 of the fourth hairpin, a first welding section 153 of the fourth hairpin, a second positioning section 154 of the fourth hairpin, a second straight section 155 of the fourth hairpin, and a second welding section 156 of the fourth hairpin.

[0091] As Figure 8 shown, the fifth hairpin 16 includes a first positioning section 161 of the fifth hairpin, a first straight section 162 of the fifth hairpin, a first welding section 163 of the fifth hairpin, a second positioning section 164 of the fifth hairpin, a second straight section 165 of the fifth hairpin, and a second welding section 166 of the fifth hairpin.

[0092] As Figure 9 shown, the sixth hairpin 17 includes a first positioning section 171 of the sixth hairpin, a first straight section 172 of the sixth hairpin, a first welding section 173 of the sixth hairpin, a second positioning section 174 of the sixth hairpin, a second straight section 175 of the sixth hairpin, and a second welding section 176 of the sixth hairpin.

[0093] As Figure 10 shown, the seventh hairpin 18 includes a first positioning section 181 of the seventh hairpin, a first straight section 182 of the seventh hairpin, a first welding section 183 of the seventh hairpin, a second positioning section 184 of the seventh hairpin, a second straight section 185 of the seventh hairpin, and a second welding section 186 of the seventh hairpin.

[0094] Specifically, the two wire bodies of the second hairpin 13 straddle 6 iron core slots 21, and the included angle between the center lines of the iron core slots 21 where the two straight segments are located is 5°×5 = 25°; the two wire bodies of the third hairpin 14 straddle 8 iron core slots 21, and the included angle between the center lines of the iron core slots 21 where the two straight segments are located is 5°×7 = 35°; the two wire bodies of the fourth hairpin 15 straddle 7 iron core slots 21, and the included angle between the center lines of the iron core slots 21 where the two straight segments are located is 5°×6 = 30°; the two wire bodies of the fifth hairpin 16 straddle 7 iron core slots 21, and the included angle between the center lines of the iron core slots 21 where the two straight segments are located is 5°×6 = 30°; the two wire bodies of the sixth hairpin 17 straddle 8 iron core slots 21, and the included angle between the center lines of the iron core slots 21 where the two straight segments are located is 5°×7 = 35°; the two wire bodies of the seventh hairpin 18 straddle 6 iron core slots 21, and the included angle between the center lines of the iron core slots 21 where the two straight segments are located is 5°×5 = 25°.

[0095] Specifically, there are 6 layers of hairpin wires inserted in the iron core slots 21, which are the 1st to 6th layers from the inside to the outside in sequence. Here, the inside and outside are based on the center of the iron core 2. The side closer to the center of the iron core 2 is the inside, and the opposite is the outside.

[0096] I. When the winding coil 1 is a 2-circuit winding (i.e., the U phase is two-branch):

[0097] The first hairpin 12 is inserted into the 1st layer of the 1st to 12th iron core slots 21, with a total of 12 roots;

[0098] The second hairpin 13 is inserted into the 1st layer of the iron core slots 21. Among them, the first straight segment 132 is inserted into the 1st layer of the (14 + 13*n + 2*m)-th slot, and the second straight segment 135 is inserted into the 1st layer of the (19 + 13*n + 2*m)-th slot, where m = 0, 1, 2 and n = 0, 1, 2, 3, 4;

[0099] The third hairpin 14 is inserted into the 1st layer of the iron core slots 21. Among them, the first straight segment 142 is inserted into the 1st layer of the (13 + 13*n + 2*m)-th slot, and the second straight segment 145 is inserted into the 1st layer of the (20 + 13*n + 2*m)-th slot, where m = 0, 1, 2 and n = 0, 1, 2, 3, 4;

[0100] The fourth hairpin 15 is inserted into the 2nd and 3rd layers of the iron core slots 21. Among them, the first straight segment 152 is inserted into the 3rd layer of the 1st - 72nd slot, and the second straight segment 155 is inserted into the 2nd layer of the 1st - 72nd slot;

[0101] The fifth hairpin 16 is inserted into the 4th and 5th layers of the iron core slots 21. Among them, the first straight segment 162 is inserted into the 5th layer of the 1st - 72nd slot, and the second straight segment 165 is inserted into the 4th layer of the 1st - 72nd slot;

[0102] The sixth hairpin 17 is inserted into the 6th layer of the iron core slot 21, where the first straight section 172 is inserted into the 6th layer of the slot numbered 1 + 13*k + 2*m, and the second straight section 175 is inserted into the 6th layer of the slot numbered 8 + 13*k + 2*m, m = 0, 1, 2, k = 0, 1, 2, 3, 4, 5;

[0103] The seventh hairpin 18 is inserted into the 6th layer of the iron core slot 21, where the first straight section 182 is inserted into the 6th layer of the slot numbered 2 + 13*k + 2*m, and the second straight section 185 is inserted into the 6th layer of the slot numbered 7 + 13*k + 2*m, m = 0, 1, 2, k = 0, 1, 2, 3, 4, 5.

[0104] As Figure 12 shown, the vertical direction represents the number of layers (1 - 6), and the horizontal direction represents the number of slots (1 - 72). When taking the U phase as two branches a and b:

[0105] The slot-internal wire threading positions of the slot-internal wire segments corresponding to the winding coils 1 (i.e., the corresponding multiple hairpin wires) in branch one are in sequence: slot 1 layer 1, slot 7 layer 2, slot 13 layer 3, slot 19 layer 4, slot 25 layer 5, slot 31 layer 6, slot 38 layer 6, slot 32 layer 5, slot 26 layer 4, slot 20 layer 3, slot 14 layer 2, slot 8 layer 1, slot 13 layer 1, slot 19 layer 2, slot 25 layer 3, slot 31 layer 4, slot 37 layer 5, slot 43 layer 6, slot 50 layer 6, slot 44 layer 5, slot 38 layer 4, slot 32 layer 3, slot 26 layer 2, slot 20 layer 1, slot 25 layer 1, slot 31 layer 2, slot 37 layer 3, slot 43 layer 4, slot 49 layer 5, slot 55 layer 6, slot 62 layer 6, slot 56 layer 5, slot 50 layer 4, slot 44 layer 3, slot 38 layer 2, slot 32 layer 1, slot 37 layer 1, slot 43 layer 2, slot 49 layer 3, slot 55 layer 4, slot 61 layer 5, slot 67 layer 6, slot 2 layer 6, slot 68 layer 5, slot 62 layer 4, slot 56 layer 3, slot 50 layer 2, slot 44 layer 1, slot 49 layer 1, slot 55 layer 2, slot 61 layer 3, slot 67 layer 4, slot 1 layer 5, slot 7 layer 6, slot 14 layer 6, slot 8 layer 5, slot 2 layer 4, slot 68 layer 3, slot 62 layer 2, slot 56 layer 1, slot 61 layer 1, slot 67 layer 2, slot 1 layer 3, slot 7 layer 4, slot 13 layer 5, slot 19 layer 6, slot 26 layer 6, slot 20 layer 5, slot 14 layer 4, slot 8 layer 3, slot 2 layer 2, slot 68 layer 1.

[0106] The slot-in wire positions of the wire segments in the slots corresponding to the winding coil 1 in branch two (i.e., the corresponding multiple hairpin conductors) are successively: layer 1 of slot 2, layer 2 of slot 8, layer 3 of slot 14, layer 4 of slot 20, layer 5 of slot 26, layer 6 of slot 32, layer 6 of slot 37, layer 5 of slot 31, layer 4 of slot 25, layer 3 of slot 19, layer 2 of slot 13, layer 1 of slot 7, layer 1 of slot 14, layer 2 of slot 20, layer 3 of slot 26, layer 4 of slot 32, layer 5 of slot 38, layer 6 of slot 44, layer 6 of slot 49, layer 5 of slot 43, layer 4 of slot 37, layer 3 of slot 31, layer 2 of slot 25, layer 1 of slot 19, layer 1 of slot 26, layer 2 of slot 32, layer 3 of slot 38, layer 4 of slot 44, layer 5 of slot 50, layer 6 of slot 56, layer 6 of slot 61, layer 5 of slot 55, layer 4 of slot 49, layer 3 of slot 43, layer 2 of slot 37, layer 1 of slot 31, layer 1 of slot 38, layer 2 of slot 44, layer 3 of slot 50, layer 4 of slot 56, layer 5 of slot 62, layer 6 of slot 68, layer 6 of slot 1, layer 5 of slot 67, layer 4 of slot 61, layer 3 of slot 55, layer 2 of slot 49, layer 1 of slot 43, layer 1 of slot 50, layer 2 of slot 56, layer 3 of slot 62, layer 4 of slot 68, layer 5 of slot 2, layer 6 of slot 8, layer 6 of slot 13, layer 5 of slot 7, layer 4 of slot 1, layer 3 of slot 67, layer 2 of slot 61, layer 1 of slot 55, layer 1 of slot 62, layer 2 of slot 68, layer 3 of slot 2, layer 4 of slot 8, layer 5 of slot 14, layer 6 of slot 20, layer 6 of slot 25, layer 5 of slot 19, layer 4 of slot 13, layer 3 of slot 7, layer 2 of slot 1, layer 1 of slot 67.

[0107] II. When the winding coil 1 is a three-way winding (i.e., the U phase has three branches):

[0108] The first hairpin 12 is inserted into the first layer of the iron core slots 21 numbered 1 + 2m, 19 + 2m, 26 + 2m, 44 + 2m, 49 + 2m, 67 + 2m, a total of 18 pieces, m = 0, 1, 2;

[0109] The second hairpin 13 is inserted into the first layer of the iron core slots 21, where the first straight section 132 is inserted into the first layer of the slot numbered 8 + 13*n + 2*m, and the second straight section 135 is inserted into the first layer of the slot numbered 13 + 13*n + 2*m, m = 0, 1, 2, n = 0, 1, 2, 3, 4;

[0110] The third hairpin 14 is inserted into the first layer of the iron core slots 21, where the first straight section 142 is inserted into the first layer of the slot numbered 7 + 13*n + 2*m, and the second straight section 145 is inserted into the first layer of the slot numbered 14 + 13*n + 2*m, m = 0, 1, 2, n = 0, 1, 2, 3, 4;

[0111] The fourth hairpin 15 is inserted into the second layer and the third layer of the iron core slots 21, where the first straight section 152 is inserted into the third layer of the slots numbered 1 - 72, and the second straight section 155 is inserted into the second layer of the slots numbered 1 - 72;

[0112] The fifth hairpin 16 is inserted into the 4th and 5th layers of the iron core slot 21, where the first straight section 162 is inserted into the 5th layer of the slots numbered 1 - 72, and the second straight section 165 is inserted into the 4th layer of the slots numbered 1 - 72;

[0113] The sixth hairpin 17 is inserted into the 6th layer of the iron core slot 21, where the first straight section 172 is inserted into the 6th layer of the slots numbered 1 + 13*k + 2*m, and the second straight section 175 is inserted into the 6th layer of the slots numbered 8 + 13*k + 2*m, m = 0, 1, 2, k = 0, 1, 2, 3, 4, 5;

[0114] The seventh hairpin 18 is inserted into the 6th layer of the iron core slot 21, where the first straight section 182 is inserted into the 6th layer of the slots numbered 2 + 13*k + 2*m, and the second straight section 185 is inserted into the 6th layer of the slots numbered 7 + 13*k + 2*m, m = 0, 1, 2, k = 0, 1, 2, 3, 4, 5.

[0115] As Figure 15 shown, the vertical direction represents the number of layers (1 - 6), the horizontal direction represents the number of slots (1 - 72), when the U - phase has three branches a, b, and c:

[0116] The slot - in wire positions of the wire segments in the slots corresponding to the winding coils 1 (i.e., the corresponding multiple hairpin wires) in branch one are in sequence: layer 1 of slot 26, layer 2 of slot 32, layer 3 of slot 38, layer 4 of slot 44, layer 5 of slot 50, layer 6 of slot 56, layer 6 of slot 61, layer 5 of slot 55, layer 4 of slot 49, layer 3 of slot 43, layer 2 of slot 37, layer 1 of slot 31, layer 1 of slot 38, layer 2 of slot 44, layer 3 of slot 50, layer 4 of slot 56, layer 5 of slot 62, layer 6 of slot 68, layer 6 of slot 1, layer 5 of slot 67, layer 4 of slot 61, layer 3 of slot 55, layer 2 of slot 49, layer 1 of slot 43, layer 1 of slot 50, layer 2 of slot 56, layer 3 of slot 62, layer 4 of slot 68, layer 5 of slot 2, layer 6 of slot 8, layer 6 of slot 13, layer 5 of slot 7, layer 4 of slot 1, layer 3 of slot 67, layer 2 of slot 61, layer 1 of slot 55, layer 1 of slot 62, layer 2 of slot 68, layer 3 of slot 2, layer 4 of slot 8, layer 5 of slot 14, layer 6 of slot 20.

[0117] The slot threading positions of the slot conductors of winding coil 1 in branch two (i.e., the corresponding multiple hairpin conductors) in the slots are successively: layer 1 of slot 49, layer 2 of slot 55, layer 3 of slot 61, layer 4 of slot 67, layer 5 of slot 1, layer 6 of slot 7, layer 6 of slot 14, layer 5 of slot 8, layer 4 of slot 2, layer 3 of slot 68, layer 2 of slot 62, layer 1 of slot 56, layer 1 of slot 61, layer 2 of slot 67, layer 3 of slot 1, layer 4 of slot 7, layer 5 of slot 13, layer 6 of slot 19, layer 6 of slot 26, layer 5 of slot 20, layer 4 of slot 14, layer 3 of slot 8, layer 2 of slot 2, layer 1 of slot 68, layer 1 of slot 2, layer 2 of slot 8, layer 3 of slot 14, layer 4 of slot 20, layer 5 of slot 26, layer 6 of slot 32, layer 6 of slot 37, layer 5 of slot 31, layer 4 of slot 25, layer 3 of slot 19, layer 2 of slot 13, layer 1 of slot 7, layer 1 of slot 14, layer 2 of slot 20, layer 3 of slot 26, layer 4 of slot 32, layer 5 of slot 38, layer 6 of slot 44.

[0118] The slot threading positions of the slot conductors of winding coil 1 in branch three (i.e., the corresponding multiple hairpin conductors) in the slots are successively: layer 1 of slot 1, layer 2 of slot 7, layer 3 of slot 13, layer 4 of slot 19, layer 5 of slot 25, layer 6 of slot 31, layer 6 of slot 38, layer 5 of slot 32, layer 4 of slot 26, layer 3 of slot 20, layer 2 of slot 14, layer 1 of slot 8, layer 1 of slot 13, layer 2 of slot 19, layer 3 of slot 25, layer 4 of slot 31, layer 5 of slot 37, layer 6 of slot 43, layer 6 of slot 50, layer 5 of slot 44, layer 4 of slot 38, layer 3 of slot 32, layer 2 of slot 26, layer 1 of slot 20, layer 1 of slot 25, layer 2 of slot 31, layer 3 of slot 37, layer 4 of slot 43, layer 5 of slot 49, layer 6 of slot 55, layer 6 of slot 62, layer 5 of slot 56, layer 4 of slot 50, layer 3 of slot 44, layer 2 of slot 38, layer 1 of slot 32, layer 1 of slot 37, layer 2 of slot 43, layer 3 of slot 49, layer 4 of slot 55, layer 5 of slot 61, layer 6 of slot 67, layer 6 of slot 2, layer 5 of slot 68, layer 4 of slot 62, layer 3 of slot 56, layer 2 of slot 50, layer 1 of slot 44.

[0119] III. When winding coil 1 is a 4 - path winding (i.e., the U - phase has four branches):

[0120] The first hairpin 12 is inserted into the 1st layer and the 6th layer of the iron core slot 21, 12 are inserted into the 1st layer of the slots numbered 1 + 2m, 2 + 2m, 31 + 2m, 32 + 2m, and 12 are inserted into the 2nd layer of the slots numbered 25 + 2m, 26 + 2m, 67 + 2m, 68 + 2m, with a total of 24, where m = 0, 1, 2;

[0121] The second hairpin 13 is inserted into the 1st layer of the iron core slot 21, where the first straight section 132 is inserted into the 1st layer of the slot numbered 8 + 13*n + 2*m, and the second straight section 135 is inserted into the 1st layer of the slot numbered 13 + 13*n + 2*m, where m = 0, 1, 2 and n = 0, 1, 2, 3, 4;

[0122] The third hairpin 14 is inserted into the first layer of the iron core slot 21, where the first straight section 142 is inserted into the first layer of the slot numbered 7 + 13*n + 2*m, and the second straight section 145 is inserted into the first layer of the slot numbered 14 + 13*n + 2*m, where m = 0, 1, 2 and n = 0, 1, 2, 3, 4;

[0123] The fourth hairpin 15 is inserted into the second and third layers of the iron core slot 21, where the first straight section 152 is inserted into the third layer of the slots numbered 1 - 72, and the second straight section 155 is inserted into the second layer of the slots numbered 1 - 72;

[0124] The fifth hairpin 16 is inserted into the fourth and fifth layers of the iron core slot 21, where the first straight section 162 is inserted into the fifth layer of the slots numbered 1 - 72, and the second straight section 165 is inserted into the fourth layer of the slots numbered 1 - 72;

[0125] The sixth hairpin 17 is inserted into the sixth layer of the iron core slot 21, where the first straight section 172 is inserted into the sixth layer of the slot numbered 1 + 13*k + 2*m, and the second straight section 175 is inserted into the sixth layer of the slot numbered 8 + 13*k + 2*m, where m = 0, 1, 2 and k = 0, 1, 2, 3, 4, 5;

[0126] The seventh hairpin 18 is inserted into the sixth layer of the iron core slot 21, where the first straight section 182 is inserted into the sixth layer of the slot numbered 2 + 13*k + 2*m, and the second straight section 185 is inserted into the sixth layer of the slot numbered 7 + 13*k + 2*m, where m = 0, 1, 2 and k = 0, 1, 2, 3, 4, 5.

[0127] As Figure 18 shown, the vertical direction is the layer number (1 - 6), the horizontal direction is the slot number (1 - 72), when the U phase has four branches a, b, c, d:

[0128] The slot-in wire positions of the wire segments in the slots corresponding to the winding coils 1 (i.e., the corresponding multiple hairpin wires) in branch one are in sequence: the first layer of slot 1, the second layer of slot 7, the third layer of slot 13, the fourth layer of slot 19, the fifth layer of slot 25, the sixth layer of slot 31, the sixth layer of slot 38, the fifth layer of slot 32, the fourth layer of slot 26, the third layer of slot 20, the second layer of slot 14, the first layer of slot 8, the first layer of slot 13, the second layer of slot 19, the third layer of slot 25, the fourth layer of slot 31, the fifth layer of slot 37, the sixth layer of slot 43, the sixth layer of slot 50, the fifth layer of slot 44, the fourth layer of slot 38, the third layer of slot 32, the second layer of slot 26, the first layer of slot 20, the first layer of slot 25, the second layer of slot 31, the third layer of slot 37, the fourth layer of slot 43, the fifth layer of slot 49, the sixth layer of slot 55, the sixth layer of slot 62, the fifth layer of slot 56, the fourth layer of slot 50, the third layer of slot 44, the second layer of slot 38, the first layer of slot 32.

[0129] The slot threading positions of the multiple slot conductor segments corresponding to the winding coil 1 in branch 2 (i.e., the corresponding multiple hairpin conductors) are as follows: 2 slots 1 layer, 8 slots 2 layers, 14 slots 3 layers, 20 slots 4 layers, 26 slots 5 layers, 32 slots 6 layers, 37 slots 6 layers, 31 slots 5 layers, 25 slots 4 layers, 19 slots 3 layers, 13 slots 2 layers, 7 slots 1 layer, 14 slots 1 layer, 20 slots 2 layers, 26 3 layers of slots, 4 layers of slots 32, 5 layers of slots 38, 6 layers of slots 44, 6 layers of slots 49, 5 layers of slots 43, 4 layers of slots 37, 4 layers of slots 31, 2 layers of slots 25, 1 layers of slots 19, 1 layers of slots 26, 2 layers of slots 32, 3 layers of slots 38, 4 layers of slots 44, 5 layers of slots 50, 6 layers of slots 56, 6 layers of slots 61, 5 layers of slots 55, 4 layers of slots 49, 4 layers of slots 43, 3 layers of slots 37, 2 layers of slots 31.

[0130] The in-slot threading positions of the multiple in-slot wire segments corresponding to the winding coil 1 in branch three (i.e., the corresponding multiple hairpin wires) are: 37 slot 1 layer, 43 slot 2 layer, 49 slot 3 layer, 55 slot 4 layer, 61 slot 5 layer, 67 slot 6 layer, 2 slot 6 layer, 68 slot 5 layer, 62 slot 4 layer, 56 slot 3 layer, 50 slot 2 layer, 44 slot 1 layer, 49 slot 1 layer, 55 slot 2 layer, 61 slot 3 layer, 67 slot 4 layer, 1 slot 5 layer, 7 slot 6 layer, 14 slot 6 layer, 8 slot 5 layer, 2 slot 4 layer, 68 slot 3 layer, 62 slot 2 layer, 56 slot 1 layer, 61 slot 1 layer, 67 slot 2 layer, 1 slot 3 layer, 7 slot 4 layer, 13 slot 5 layers, 19 slot 6 layers, 26 slot 6 layers, 20 slot 5 layers, 14 slot 4 layers, 8 slot 3 layers, 2 slot 2 layers, and 68 slot 1 layer.

[0131] The in-slot threading positions of the multiple in-slot wire segments corresponding to the winding coil 1 in branch four (i.e., the corresponding multiple hairpin wires) are: 38 slots 1 layer, 44 slots 2 layers, 50 slots 3 layers, 56 slots 4 layers, 62 slots 5 layers, 68 slots 6 layers, 1 slot 6 layers, 67 slots 5 layers, 61 slot 4 layers, 55 slots 3 layers, 49 slots 2 layers, 43 slots 1 layer, 50 slots 1 layer, 56 slots 2 layers, 62 slots 3 layers, 68 slots 4 layers, 2 slots 5 layers, 8 slots 6 layers, 13 slots 6 layers, 7 slots 5 layers, 1 slot 4 layers, 67 slots 3 layers, 61 slots 2 layers, 55 slots 1 layer, 62 slots 1 layer, 68 slots 2 layers, 2 slots 3 layers, 8 slots 4 layers, 14 slots 5 layers, 20 slots 6 layers, 25 slots 6 layers, 19 slots 5 layers, 13 slots 4 layers, 7 slots 3 layers, 1 slot 2 layers, and 67 slots 1 layer.

[0132] The utility model also discloses a flat wire motor (not shown), comprising the flat wire motor stator and a rotor, wherein the rotor is coaxially arranged in the flat wire motor stator. The flat wire motor has twelve poles.

[0133] Figure 11 , Figure 14 as well as Figure 17In the comparative example of the present utility model (the experimental motor model in the comparative example is TZ327XS-010), the winding flux linkage waveform trend when the U-phase has two branches, three branches, and four branches respectively under the condition of branch imbalance. When there is branch imbalance, the flux linkage waveforms will not completely overlap. Therefore, the induced electromotive forces generated in each branch cannot be completely cancelled out, and currents will be generated between the branches, resulting in additional losses.

[0134] Figure 13 , Figure 16 and Figure 19 In the embodiment of the present utility model, the winding flux linkage waveform trend when the U-phase has two branches, three branches, and four branches respectively under the condition of branch imbalance. When the branches are balanced, the flux linkage waveforms completely overlap. Therefore, the induced electromotive forces generated in each branch can be completely cancelled out and no circulating current will be generated between the branches.

[0135] The above embodiments are only used to illustrate the technical concept and features of the present utility model, and the purpose is to enable those familiar with this technology to understand the content of the present utility model and implement it accordingly. It cannot be used to limit the protection scope of the present utility model. Any equivalent changes or modifications made according to the spirit and essence of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A flat wire motor stator, characterized in that: It comprises a winding coil (1) and a stator core (2); The winding coil (1) comprises a star point copper bar (11) and a plurality of hairpin wires; the winding coil (1) is a three-phase winding of U, V, and W, and the three-phase connection method is the same; A plurality of core slots (21) are evenly spaced in the circumferential direction on the inner side of the stator core (2), the slot depth of each core slot (21) corresponding to the radial direction of the stator core (2), and the slot length corresponding to the axial direction of the stator core (2); The hairpin conductors are inserted and positioned in the core slots (21) along the axial direction of the stator core (2), and a plurality of hairpin conductors in each core slot (21) are arranged layer by layer along the radial direction of the stator core (2); The hairpin conductors include single-wire and double-wire types. The single-wire hairpin conductors are composed of one conductor body, and the double-wire hairpin conductors are composed of two conductor bodies that are spaced apart and connected at the upper ends. Each conductor body includes a straight section inserted into the core slot (21), a positioning section connected to the upper end of the straight section, and a welding section connected to the lower end of the straight section. The positioning section and the welding section are respectively exposed at two axial ends of the stator core (2). After welding, the welding sections of each hairpin conductor are connected via a star copper bar (11). All the hairpin conductors form a plurality of parallel branches in the winding coil (1). Wherein, the single-type hairpin conductor comprises a first hairpin (12); The double-type hairpin conductor comprises a second hairpin (13), a third hairpin (14), a fourth hairpin (15), a fifth hairpin (16), a sixth hairpin (17) and a seventh hairpin (18), and the distance between the straight sections of the two conductor bodies is in descending order: the seventh hairpin (18), the third hairpin (14), the fifth hairpin (16), the fourth hairpin (15), the sixth hairpin (17), and the second hairpin (13); It also includes insulating paper (3) arranged between the iron core slot (21) and the winding coil (1).

2. The flat wire motor stator according to claim 1, characterized in that: The number of the iron core slots (21) is 72, and the angle between the center lines of two adjacent iron core slots (21) in the slot depth direction is 5°.

3. The flat wire motor stator according to claim 2, characterized in that: The two conductors of the second hairpin (13) span six core slots (21), and the included angle between the center lines of the core slots (21) where the two conductors are located is 25°; The two conductors of the third hairpin (14) span eight core slots (21), and the included angle between the center lines of the core slots (21) where the two conductors are located is 35°; The two conductors of the fourth hairpin (15) span seven core slots (21), and the included angle between the center lines of the core slots (21) where the two conductors are located is 30°; The two conductors of the fifth hairpin (16) span seven core slots (21), and the included angle between the center lines of the core slots (21) where the two conductors are located is 30°; The two conductors of the sixth hairpin (17) span eight core slots (21), and the included angle between the center lines of the core slots (21) where the two conductors are located is 35°; The two conductors of the seventh hairpin (18) span six core slots (21), and the included angle between the center lines of the core slots (21) where the two conductors are located is 25°.

4. The flat wire motor stator according to claim 3, characterized in that: The hairpin wires inserted in the core slot (21) have 6 layers, 1 to 6 layers from the inside to the outside; when the winding coil (1) is a 2-way winding: The first hairpins (12) are inserted into the first layer of the first to twelfth core slots (21), with a total of 12 hairpins; The second hairpin (13) is plugged into the first layer of the core slot (21), wherein the first straight section (132) of the second hairpin is plugged into the first layer of the 14th+13*n+2*mth slot, and the second straight section (135) of the second hairpin is plugged into the first layer of the 19th+13*n+2*mth slot, m=0, 1, 2, n=0, 1, 2, 3, 4; The third hairpin (14) is plugged into the first layer of the core slot (21), wherein the first straight section (142) of the third hairpin is plugged into the first layer of the slot No. 13+13*n+2*m, and the second straight section (145) of the third hairpin is plugged into the first layer of the slot No. 20+13*n+2*m, m=0, 1, 2, n=0, 1, 2, 3, 4; The fourth hairpin (15) is plugged into the second and third layers of the core slot (21), wherein the first straight section (152) of the fourth hairpin is plugged into the third layer of slots No. 1-72, and the second straight section (155) of the fourth hairpin is plugged into the second layer of slots No. 1-72; The fifth hairpin (16) is plugged into the 4th and 5th layers of the core slot (21), wherein the first straight section (162) of the fifth hairpin is plugged into the 5th layer of slots No. 1-72, and the second straight section (165) of the fifth hairpin is plugged into the 4th layer of slots No. 1-72; The sixth hairpin (17) is plugged into the sixth layer of the core slot (21), wherein the first straight section (172) of the sixth hairpin is plugged into the sixth layer of the slot No. 1+13*k+2*m, and the second straight section (175) of the sixth hairpin is plugged into the sixth layer of the slot No. 8+13*k+2*m, m=0, 1, 2, k=0, 1, 2, 3, 4, 5; The seventh hairpin (18) is plugged into the sixth layer of the core slot (21), wherein the first straight section (182) of the seventh hairpin is plugged into the sixth layer of the second + 13*k + 2*m slot, and the second straight section (185) of the seventh hairpin is plugged into the sixth layer of the seventh + 13*k + 2*m slot, m = 0, 1, 2, k = 0, 1, 2, 3, 4, 5.

5. The flat wire motor stator according to claim 3, characterized in that: The hairpin wires inserted in the core slot (21) have six layers, which are 1 to 6 layers from the inside to the outside. When the winding coil (1) is a three-way winding: The first hairpins (12) are inserted into the first layer of the iron core slots (21) No. 1+2m, 19+2m, 26+2m, 44+2m, 49+2m, and 67+2m, a total of 18 hairpins, m=0, 1, 2; The second hairpin (13) is plugged into the first layer of the core slot (21), wherein the first straight section (132) of the second hairpin is plugged into the first layer of the 8th+13*n+2*mth slot, and the second straight section (135) of the second hairpin is plugged into the first layer of the 13th+13*n+2*mth slot, m=0, 1, 2, n=0, 1, 2, 3, 4; The third hairpin (14) is plugged into the first layer of the core slot (21), wherein the first straight section (142) of the third hairpin is plugged into the first layer of the 7th+13*n+2*mth slot, and the second straight section (145) of the third hairpin is plugged into the first layer of the 14th+13*n+2*mth slot, m=0, 1, 2, n=0, 1, 2, 3, 4; The fourth hairpin (15) is plugged into the second and third layers of the core slot (21), wherein the first straight section (152) of the fourth hairpin is plugged into the third layer of slots No. 1-72, and the second straight section (155) of the fourth hairpin is plugged into the second layer of slots No. 1-72; The fifth hairpin (16) is plugged into the 4th and 5th layers of the core slot (21), wherein the first straight section (162) of the fifth hairpin is plugged into the 5th layer of slots No. 1-72, and the second straight section (165) of the fifth hairpin is plugged into the 4th layer of slots No. 1-72; The sixth hairpin (17) is plugged into the sixth layer of the core slot (21), wherein the first straight section (172) of the sixth hairpin is plugged into the sixth layer of the slot No. 1+13*k+2*m, and the second straight section (175) of the sixth hairpin is plugged into the sixth layer of the slot No. 8+13*k+2*m, m=0, 1, 2, k=0, 1, 2, 3, 4, 5; The seventh hairpin (18) is plugged into the sixth layer of the core slot (21), wherein the first straight section (182) of the seventh hairpin is plugged into the sixth layer of the second + 13*k + 2*m slot, and the second straight section (185) of the seventh hairpin is plugged into the sixth layer of the seventh + 13*k + 2*m slot, m = 0, 1, 2, k = 0, 1, 2, 3, 4, 5.

6. The flat wire motor stator according to claim 3, characterized in that: The hairpin wires inserted in the core slot (21) have six layers, which are 1 to 6 layers from the inside to the outside. When the winding coil (1) is a 4-way winding: The first hairpins (12) are plugged into the first and sixth layers of the core slots (21), with a total of 24 hairpins, of which 12 are plugged into the first layer of slots No. 1+2m, 2+2m, 31+2m, and 32+2m, and 12 are plugged into the second layer of slots No. 25+2m, 26+2m, 67+2m, and 68+2m, where m=0, 1, and 2; The second hairpin (13) is plugged into the first layer of the core slot (21), wherein the first straight section (132) of the second hairpin is plugged into the first layer of the 8th+13*n+2*mth slot, and the second straight section (135) of the second hairpin is plugged into the first layer of the 13th+13*n+2*mth slot, m=0, 1, 2, n=0, 1, 2, 3, 4; The third hairpin (14) is plugged into the first layer of the core slot (21), wherein the first straight section (142) of the third hairpin is plugged into the first layer of the 7th+13*n+2*mth slot, and the second straight section (145) of the third hairpin is plugged into the first layer of the 14th+13*n+2*mth slot, m=0, 1, 2, n=0, 1, 2, 3, 4; The fourth hairpin (15) is plugged into the second and third layers of the core slot (21), wherein the first straight section (152) of the fourth hairpin is plugged into the third layer of slots No. 1-72, and the second straight section (155) of the fourth hairpin is plugged into the second layer of slots No. 1-72; The fifth hairpin (16) is plugged into the 4th and 5th layers of the core slot (21), wherein the first straight section (162) of the fifth hairpin is plugged into the 5th layer of slots No. 1-72, and the second straight section (165) of the fifth hairpin is plugged into the 4th layer of slots No. 1-72; The sixth hairpin (17) is plugged into the sixth layer of the core slot (21), wherein the first straight section (172) of the sixth hairpin is plugged into the sixth layer of the slot No. 1+13*k+2*m, and the second straight section (175) of the sixth hairpin is plugged into the sixth layer of the slot No. 8+13*k+2*m, m=0, 1, 2, k=0, 1, 2, 3, 4, 5; The seventh hairpin (18) is plugged into the sixth layer of the core slot (21), wherein the first straight section (182) of the seventh hairpin is plugged into the sixth layer of the second + 13*k + 2*m slot, and the second straight section (185) of the seventh hairpin is plugged into the sixth layer of the seventh + 13*k + 2*m slot, m = 0, 1, 2, k = 0, 1, 2, 3, 4, 5.

7. A flat wire motor, characterized in that: It comprises the flat wire motor stator according to any one of claims 1 to 6 and a rotor, wherein the rotor is coaxially arranged in the flat wire motor stator.

Images