Flat wire motor stator, flat wire motor and design method of flat wire motor stator

Abstract

A kind of flat wire motor stator, flat wire motor and the design method of flat wire motor stator, flat wire motor stator is composed of stator body, flat wire winding and insulating paper, the stator body is provided with stator slot, the insulating paper is inserted into stator slot to insulate between flat wire winding and stator body, the flat wire winding is wound as follows: determine the required motor flat platform, calculate the angular position of each stator slot in the plane circumferential direction, connection sequence, conductor layer position etc., the angular position of connection point position on each branch in circumferential direction is calculated and determined.This scheme quickly designs the stator winding of structure simplification and each parallel branch complete symmetry, winding manufacturing process is simplified, can reduce loop current loss, reduce harmonic content, reduce ac resistance loss, improve motor performance.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a design method for a flat wire motor stator, a flat wire motor, and a flat wire motor stator. Background Technology

[0002] The statements in this section are merely background information related to this application and do not necessarily constitute prior art.

[0003] With the development of new energy vehicles and the increasing maturity of the market, electric motors, as the main power source for new energy vehicles, especially the sole power source for pure electric vehicles, face increasingly higher requirements for torque density, power density, and efficiency to meet the power and economy requirements of new energy vehicles. Flat wire motors, with their advantages of high copper utilization, excellent heat dissipation performance, and a wide high-efficiency operating range, have gained widespread application in the field of new energy vehicle drive motors.

[0004] In the process of developing this application, the applicant discovered that existing flat wire motor winding structures have numerous problems, such as complex winding manufacturing processes, additional losses due to loop current phenomena, high stator-side harmonic content causing vibration and noise, and significant AC resistance losses reducing efficiency. These problems severely restrict further improvements in motor performance. The specific problems are as follows: 1. The existing manufacturing process for flat wire motor windings usually requires inserting the flat wire windings into the stator slots multiple times. The process is cumbersome and difficult to automate, resulting in high manufacturing costs.

[0005] 2. In addition, since the flat wire winding has multiple parallel branches, a non-negligible loop current will be generated during operation, causing additional copper losses.

[0006] 3. Furthermore, the required flat wire platform for the motor varies depending on the voltage platform and power performance requirements of the vehicle. For different platforms, it is necessary to redesign the winding, redevelop the technology, and re-make the hairpin forming mold. This results in a long design cycle, high cost, and poor applicability.

[0007] 4. Furthermore, the distributed winding characteristics of flat wire windings result in a high content of harmonics in the stator magnetic field, which leads to vibration and noise problems.

[0008] 5. Finally, the AC effect of flat wire windings also leads to greater AC resistance loss, reducing the efficiency of the motor.

[0009] In view of this, how to solve the problems of complex processes, loop current, long design cycle and high loss in the existing flat wire motor winding manufacturing has become the research topic to be solved by this invention. Summary of the Invention

[0010] The purpose of this invention is to provide a design method for a flat wire motor stator, a flat wire motor, and a flat wire motor stator.

[0011] To achieve the above objectives, the first aspect of this invention adopts the following technical solution: A flat wire motor stator is proposed, comprising a stator body, flat wire windings, and insulating paper. The stator body has stator slots, and the insulating paper is inserted into the stator slots to insulate the flat wire windings from the stator body. The flat wire motor has A stator slots, 2P poles, 2m layers from the inside to the outside of the stator slots, and r conductors within the stator slots. The flat wire windings are defined as having one, two, and four parallel branches. The angular position of each stator slot in the planar circumferential direction is θ; The connection sequence of the points to be connected in each parallel branch of the three phases U, V, and W is n; The conductor layer number M in the stator slot represented by each connection point is determined according to the connection sequence n of each connection point and the number of poles 2P of the motor. The order k of each connection point is obtained by first performing a modulo operation between the connection order n and the number of motor poles 2P, and then regrouping each connection point according to the number of motor poles. The position r(n) of different layers in the stator slot is obtained by taking the modulo operation of the conductor layer position M and the connection sequence n of the conductor represented by each connection point in the stator slot; Branch 1 determines the angular position θ1(n) of the connection point in the circumferential direction based on the order k of the pole where each connection point is located and the position r(n) in the slot; The angular position θ2(n) of each connection point of branch 2 is the same as the angular position θ1(n) of the odd-numbered layer of branch 1 when the conductor layer number position M is an even-numbered layer, and the angular position θ1(n) of the even-numbered layer of branch 1 when the conductor layer number position M is an odd-numbered layer. The angle positions θ3(n) of branch three and θ4(n) of branch four are respectively mathematically calculated based on branch one and branch two, with the number of stator slots A divided by the number of poles 2P as the factor. The flat wire conductor is wound based on the angle position θ, connection order n, layer position M, pole order k, and slot position r (n) of each parallel branch obtained above.

[0012] To achieve the above objectives, the second aspect of the present invention provides a technical solution: a flat wire motor, wherein the flat wire motor includes a flat wire motor stator as described in the first aspect of the present invention.

[0013] To achieve the above objectives, a third aspect of the present invention provides a technical solution: a design method for a flat wire motor stator, the design method comprising: Determine the required flat wire platform for the motor, and based on the flat wire platform, obtain the number of stator slots A, number of poles 2P, and number of layers 2m from the inside to the outside of the stator slot for the flat wire motor to be prepared. r is the number of conductors in the stator slot. Determine the flat wire windings with parallel branches of one, two, and four. Calculate the angular position θ of each stator slot in the planar circumferential direction; Determine the connection sequence n of the points to be connected in each parallel branch of the three phases U, V, and W; Based on the connection sequence n of each connection point and the number of poles 2P of the motor, determine the conductor layer position M in the stator slot where the conductor represented by each connection point is located; Based on the modulo operation of the connection order n and the number of poles 2P of the motor, the connection points are regrouped according to the number of motor poles to obtain the order k of the poles of each connection point. The position r(n) of different layers in the stator slot is obtained by taking the modulo operation of the conductor layer number M and the connection sequence n in the stator slot represented by each connection point. Branch 1 determines the angular position θ1(n) of the connection point in the circumferential direction based on the order k of the pole where each connection point is located and the position r(n) in the slot; The angular position θ2(n) of each connection point of branch 2 is the same as the angular position θ1(n) of the odd-numbered layer of branch 1 when the conductor layer number position M is an even-numbered layer, and the angular position θ1(n) of the even-numbered layer of branch 1 when the conductor layer number position M is an odd-numbered layer. The angle positions θ3(n) of branch three and θ4(n) of branch four are respectively mathematically calculated based on branch one and branch two, with the number of stator slots A divided by the number of poles 2P as the factor. The flat wire conductor is wound based on the angle position θ, connection order n, layer position M, pole order k, and slot position r (n) of each parallel branch obtained above.

[0014] The relevant content of this invention is explained as follows: 1. In the description of this application, this invention, through research on the winding structure, winding manufacturing process, and winding design method of flat wire motors, addresses the problems of complex processes, loop currents, long design cycles, and high losses in existing flat wire motor winding manufacturing. This invention develops a flat wire motor stator, a flat wire motor, and a design method for the flat wire motor stator. This innovative flat wire motor winding structure simplifies the winding manufacturing process, reduces loop current losses, lowers harmonic content, and reduces AC resistance losses, overcoming many defects of the prior art and significantly improving the overall performance of the flat wire motor. The number of motor turns can be adjusted by changing the number of parallel branches, adapting to different vehicle voltage platforms and power performance requirements. This scheme simplifies the stator end winding structure and avoids circulating currents between multiple parallel branches of each phase winding, thus improving motor efficiency.

[0015] 2. In the above technical solution of the present invention, the flat wire conductor in the flat wire winding has two ends extending out of the stator slot to form a crown end and a welding end, respectively. The crown end and the welding end are separated, and the welding end of the flat wire conductor is separated from the crown end. The welding end is regular and conducive to automated welding, which greatly improves the production efficiency of motor stator and improves the overall quality level of motor.

[0016] 3. In the above technical solution of the present invention, in the scheme with two parallel branches, branch one and branch three are connected and branch two and branch four are connected, or branch one and branch four are connected and branch two and branch three are connected, based on the scheme with four parallel branches. In the scheme with one parallel branch, branch two is connected to branch one, based on the scheme with two parallel branches.

[0017] By employing multiple pole slot combinations, better performance expansion of the flat wire platform for motors can be achieved by switching between parallel branches 1, 2, and 4. This solution requires fewer types of hairpins, reducing hairpin forming mold costs. Furthermore, it allows for the separation of the welding end and crown end of the flat wire conductor, resulting in a neat welding end that facilitates automated welding, significantly improving motor stator production efficiency and enhancing the overall quality of the motor.

[0018] 4. In the above technical solution of the present invention, in the number of stator slots A, the number of poles 2P, the number of stator slot layers from the inside to the outside 2m, and the connection sequence n, A, P, m, and n are all positive integers, and the angular position θ is... This allows for adjustment of the number of motor turns by changing the number of parallel branches, making it suitable for different vehicle voltage platforms and power performance requirements. When designing different flat wire platforms for motors, the winding method can be quickly calculated, greatly shortening the design cycle and ensuring that circulating currents between multiple parallel branches of each phase winding are further avoided.

[0019] 5. In the above technical solution of the present invention, the position (θ, r) of each conductor is defined in polar coordinates, where r = 1, 2, 3, ..., 2m. Different parallel branches of the winding are connected by the connection points of each conductor according to the connection sequence formula n = 1, 2, 3, ..., 2Pm to form 4 parallel branches. The V phase, W phase and U phase are wound at the same position but differ by 2π / 3P. This further shortens the design cycle and further avoids circulating current between multiple parallel branches of each phase winding.

[0020] 6. In the above technical solution of the present invention, when determining the position M of the conductor layer, the formula is used. To obtain the value of the conductor layer number position M; When obtaining the order k of the poles where each connection point is located, the formula is used. To obtain the numerical value of the order k of the pole where each connection point is located; When obtaining the slot positions r(n) of different layers within the stator slot, the formula is used. To obtain the position r(n) within the slot.

[0021] By applying the simplified formula obtained by the applicant, the accuracy of the calculated conductor layer position M, the order k of the poles at each connection point, and the position r(n) in the slot can be determined based on whether there is circulating current and grouped according to the number of poles. This makes it easier to determine the conductor position and the winding method, and requires fewer types of hairpins.

[0022] 7. In the above technical solution of the present invention, the calculation formula for the angular position θ1(n) of the branch is simplified to: ; The formula for calculating the angle position θ2(n) of the branch is simplified to: ; The formula for calculating the three angular positions θ3(n) of the branch is simplified to: ; The formula for calculating the four-angle position θ4(n) of the branch is simplified as follows: .

[0023] This winding method allows for rapid calculation of the angle position of each branch, further shortening the design cycle. Furthermore, this winding method ensures that each branch uses a completely symmetrical flat wire winding, eliminating imbalances between branches and significantly reducing losses, stabilizing torque, improving efficiency, and reducing vibration and noise.

[0024] 8. In the above technical solution of the present invention, when there are 2 parallel branches, (r(n), θ1(n)) and (r(n), θ3(n)) are connected to form L1, and (r(n), θ2(n)) and (r(n), θ4(n)) are connected to form L2; or (r(n), θ1(n)) and (r(n), θ4(n)) are connected to form L1, and (r(n), θ2(n)) and (r(n), θ3(n)) are connected to form L2; When there is 1 parallel branch, connect (r(1), θ2(n)) with (r(1), θ4(n)), connect (r(n), θ1(n)) with (r(n), θ4(n)), and connect (r(n), θ2(n)) with (r(n), θ3(n)) to form a loop.

[0025] This design allows for better performance expansion of the applicable flat wire platform in parallel branches 1, 2, and 4, and enables rapid acquisition of the winding method for the flat wire motor stator to be prepared based on the flat wire platform.

[0026] Due to the application of the above-mentioned solution, the present invention has the following advantages and effects compared with the prior art: 1. The above-mentioned solution of the present invention, through research on the winding structure, winding manufacturing process, and winding design method of flat wire motors, addresses the problems of complex processes, loop current, long design cycle, and high losses in existing flat wire motor winding manufacturing. The present invention develops a design method for a flat wire motor stator, a flat wire motor, and a flat wire motor stator. This innovative flat wire motor winding structure simplifies the winding manufacturing process, reduces loop current losses, lowers harmonic content, and reduces AC resistance losses, overcoming many defects of the prior art and significantly improving the overall performance of the flat wire motor. The number of motor turns can be adjusted by changing the number of parallel branches, adapting to different vehicle voltage platforms and power performance requirements. Furthermore, this solution simplifies the stator end winding structure and avoids circulating currents between multiple parallel branches of each phase winding, improving motor efficiency.

[0027] 2. In the above-described solution of the present invention, the flat wire winding method adopted can switch between parallel branches 1, 2, and 4 to better expand the performance of the applicable motor flat wire platform. When this winding method is applied to each motor flat wire platform, fewer types of hairpins are required, reducing the cost of hairpin forming molds. The stator end winding is simplified, and circulating currents are avoided between multiple parallel branches of each winding. By eliminating the imbalance between branches, losses are significantly reduced, torque is stabilized, efficiency is improved, and vibration and noise are reduced. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the stator of a flat wire motor according to an embodiment of the present invention; Figure 2This is a schematic diagram of the parallel branch U1 of phase U in Example 1 of the present invention; Figure 3 This is a schematic diagram of the winding of the four parallel branches of phase U in Example 1 of the present invention; Figure 4 This is a schematic diagram of the winding of two parallel branches of phase U in Example 1 of the present invention (method 1); Figure 5 This is a schematic diagram of the winding of two parallel branches of phase U in Example 1 of the present invention (method 2); Figure 6 This is a schematic diagram of the winding of one parallel branch of phase U in Example 1 of the present invention; Figure 7 This is a schematic diagram of the flat wire winding of the U, V, and W phases in an embodiment of the present invention; Figure 8 This is a schematic diagram of the three-phase load flux linkage waveform when the branches are not perfectly symmetrical under the condition of an external current source input. Figure 9 This is a schematic diagram of the load flux linkage waveform when all branches are perfectly symmetrical under the condition of an external current source input. Figure 10 This is a schematic diagram of the three-phase load current when there is an external current source input and the branches are not completely symmetrical. Figure 11 This is a schematic diagram of the three-phase load current when all branches are completely symmetrical under the condition that there is an external current source input. Figure 12 This is a schematic diagram comparing the winding losses when the branches are not completely symmetrical and completely symmetrical, under the condition that there is an external current source input. Figure 13 This is a schematic diagram comparing the torque of the branches when they are not completely symmetrical and completely symmetrical, provided that there is an external current source input. Figure 14 This is a schematic diagram of the three-phase no-load flux linkage waveform when the external current source input is 0 and the branches are not completely symmetrical. Figure 15 This is a schematic diagram of the three-phase no-load flux linkage waveform when the external current source input is 0 and all branches are completely symmetrical. Figure 16 This is a schematic diagram of the three-phase no-load current when the external current source input is 0 and the branches are not completely symmetrical. Figure 17 This is a schematic diagram of the three-phase no-load current when all branches are completely symmetrical, with the external current source input being 0. Figure 18 This is a schematic diagram comparing the winding losses of each branch when the external current source input is 0 and when the branches are not completely symmetrical and are completely symmetrical. Figure 19This diagram illustrates the torque comparison between the branches when the external current source input is 0 and when they are not completely symmetrical and are completely symmetrical.

[0029] The parts shown in the above attached diagram are illustrated below: 1. Stator body; 2. Flat wire winding; 21. Crown end; 22. Welded end; 3. Insulating paper. Detailed Implementation

[0030] The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the embodiments of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0031] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0032] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0033] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0034] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain 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 in describing this case.

[0035] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0036] The following embodiments of the present invention aim to address the problems of complex processes, loop currents, long design cycles, and high losses in the existing manufacturing of flat wire motor windings. The invention develops a design method for a flat wire motor stator, a flat wire motor, and a flat wire motor stator. The number of motor turns can be adjusted by changing the number of parallel branches, making it suitable for different vehicle voltage platforms and power performance requirements. This solution simplifies the stator end winding structure and avoids circulating currents between multiple parallel branches of each phase winding, thereby improving motor efficiency.

[0037] Example 1: This invention proposes a flat wire motor stator, such as... Figure 1 As shown, the stator of the flat wire motor consists of a stator body 1, a flat wire winding 2, and insulating paper 3. The stator body 1 is provided with stator slots. The stator body is mostly made of stator iron core. The stator body includes an outer circumferential surface and an inner circumferential surface arranged opposite each other along the radial direction of the stator body. The stator slots are axially through the inner circumferential surface of the stator iron core. The insulating paper 3 is inserted into the stator slots to insulate the flat wire winding 2 from the stator body. The flat wire winding 2 is wound in the following manner: Determine the required flat wire platform for the motor, and based on the flat wire platform, obtain the number of stator slots A, the number of poles 2P, the number of layers 2m from the inside to the outside of the stator slots of the flat wire motor to be prepared, and r is the number of conductors in the stator slot. Determine the flat wire windings with parallel branches of one, two, and four.

[0038] Calculate the angular position θ of each stator slot in the plane circumferential direction.

[0039] Determine the connection sequence n of the points to be connected in each parallel branch of the three phases U, V, and W.

[0040] Based on the connection sequence n of each connection point and the number of poles 2P of the motor, determine the conductor layer position M in the stator slot where the conductor represented by each connection point is located.

[0041] Based on the modulo operation of the connection order n and the number of poles 2P of the motor, the connection points are regrouped according to the number of motor poles to obtain the order k of the poles of each connection point.

[0042] The position r(n) of different layers in the stator slot is obtained by taking the modulo operation of the conductor layer number M and connection sequence n in the stator slot where each connection point is located.

[0043] Branch 1 determines the angular position θ1(n) of the connection point in the circumferential direction based on the order k of the pole where each connection point is located and the position r(n) in the slot.

[0044] The angular position θ2(n) of each connection point of branch 2 is the same as the angular position θ1(n) of the odd-numbered layer of branch 1 when the conductor layer number position M is an even-numbered layer, and the angular position θ1(n) of the even-numbered layer of branch 1 when the conductor layer number position M is an odd-numbered layer.

[0045] The angle positions θ3(n) of branch three and θ4(n) of branch four are respectively mathematically calculated based on branch one and branch two, with the number of stator slots A divided by the number of poles 2P as the factor.

[0046] The flat wire conductor is wound based on the angle position θ, connection order n, layer position M, pole order k, and slot position r (n) of each parallel branch obtained above.

[0047] Through the implementation of Example 1, this invention addresses the problems of complex processes, loop currents, long design cycles, and high losses in the manufacturing of existing flat wire motor windings. It develops a flat wire motor stator that simplifies the end winding structure and avoids circulating currents between multiple parallel branches of each phase winding, thereby significantly improving the overall performance of the flat wire motor. The number of motor turns can be adjusted by changing the number of parallel branches, making it suitable for different voltage platforms and power performance requirements of vehicles.

[0048] In Embodiment 1 of the present invention, as Figure 1 As shown, the flat wire conductor in the flat wire winding 2 has two ends extending out of the stator slot, forming a crown end 21 and a welding end 22 respectively. The crown end 21 and the welding end 22 are separate. The welding end 22 of the flat wire conductor is set separately from the crown end 21. The regular welding end 22 is conducive to automated welding, which greatly improves the production efficiency of the motor stator and improves the overall quality level of the motor.

[0049] In Embodiment 1 of the present invention, in the scheme with two parallel branches, branch 1 and branch 3 are connected and branch 2 and branch 4 are connected, or branch 1 and branch 4 are connected and branch 2 and branch 3 are connected, based on the scheme with four parallel branches. In the scheme with one parallel branch, branch two is connected to branch one, based on the scheme with two parallel branches.

[0050] By employing multiple pole slot combinations, better performance expansion of the flat wire platform for motors can be achieved by switching between parallel branches 1, 2, and 4. This solution requires fewer types of hairpins, reducing hairpin forming mold costs. Furthermore, it allows for the separation of the welding end and crown end of the flat wire conductor, resulting in a neat welding end that facilitates automated welding, significantly improving motor stator production efficiency and enhancing the overall quality of the motor.

[0051] In Embodiment 1 of the present invention, in the stator slot number A, pole number 2P, stator slot layer number 2m from the inside out, and connection sequence n, A, P, m, and n are all positive integers, and the angular position θ is... This allows for adjustment of the number of motor turns by changing the number of parallel branches, making it suitable for different vehicle voltage platforms and power performance requirements. When designing different flat wire platforms for motors, the winding method can be quickly calculated, greatly shortening the design cycle and ensuring that circulating currents between multiple parallel branches of each phase winding are further avoided.

[0052] In Embodiment 1 of this invention, the position (θ, r) of each conductor is defined in polar coordinates, where r = 1, 2, 3, ..., 2m. Different parallel branches of the winding are connected by the connection points of each conductor according to the connection sequence formula n = 1, 2, 3, ..., 2Pm, forming four parallel branches. The V-phase, W-phase, and U-phase windings are positioned at the same location but differ by 2π / 3P. This further shortens the design cycle and further avoids circulating currents between multiple parallel branches of each phase winding.

[0053] In Embodiment 1 of the present invention, when determining the position M of the conductor layer, the formula is used. To obtain the value of the conductor layer number position M; When obtaining the order k of the poles where each connection point is located, the formula is used. To obtain the numerical value of the order k of the pole where each connection point is located; When obtaining the slot positions r(n) of different layers within the stator slot, the formula is used. To obtain the position r(n) within the slot.

[0054] By applying the simplified formula obtained by the applicant, the accuracy of the calculated conductor layer position M, the order k of the poles at each connection point, and the position r(n) in the slot can be determined based on whether there is circulating current and grouped according to the number of poles. This makes it easier to determine the conductor position and the winding method, and requires fewer types of hairpins.

[0055] In Embodiment 1 of the present invention, the calculation formula for the angular position θ1(n) of branch one is simplified to: ; The formula for calculating the angle position θ2(n) of the branch is simplified to: ; The formula for calculating the three angular positions θ3(n) of the branch is simplified to: ; The formula for calculating the four-angle position θ4(n) of the branch is simplified as follows: .

[0056] This winding method allows for rapid calculation of the angle position of each branch, further shortening the design cycle. Furthermore, this winding method ensures that each branch uses a completely symmetrical flat wire winding, eliminating imbalances between branches and significantly reducing losses, stabilizing torque, improving efficiency, and reducing vibration and noise.

[0057] When there are 2 parallel branches, connect (r(n), θ1(n)) and (r(n), θ3(n)) to form L1, and connect (r(n), θ2(n)) and (r(n), θ4(n)) to form L2; or connect (r(n), θ1(n)) and (r(n), θ4(n)) to form L1, and connect (r(n), θ2(n)) and (r(n), θ3(n)) to form L2. When there is 1 parallel branch, connect (r(1), θ2(n)) with (r(1), θ4(n)), connect (r(n), θ1(n)) with (r(n), θ4(n)), and connect (r(n), θ2(n)) with (r(n), θ3(n)) to form a loop.

[0058] This design allows for better performance expansion of the applicable flat wire platform in parallel branches 1, 2, and 4, and enables rapid acquisition of the winding method for the flat wire motor stator to be prepared based on the flat wire platform.

[0059] Example 2: This invention proposes a flat wire motor, which includes a flat wire motor stator as described in Example 1. The flat wire motor stator is described in Example 2 and will not be repeated here.

[0060] By implementing Example 2, the flat wire motor can adjust the number of motor turns by changing the number of parallel branches, making it suitable for different voltage platforms and power performance requirements of vehicles, and can significantly improve the overall performance of the flat wire motor.

[0061] Example 3: This invention discloses a design method for a flat wire motor stator, the design method comprising: Determine the required flat wire platform for the motor, and based on the flat wire platform, obtain the number of stator slots A, the number of poles 2P, the number of layers 2m from the inside to the outside of the stator slots of the flat wire motor to be prepared, and r is the number of conductors in the stator slot. Determine the flat wire windings with parallel branches of one, two, and four.

[0062] Calculate the angular position θ of each stator slot in the plane circumferential direction.

[0063] Determine the connection sequence n of the points to be connected in each parallel branch of the three phases U, V, and W.

[0064] Based on the connection sequence n of each connection point and the number of poles 2P of the motor, determine the conductor layer position M in the stator slot where the conductor represented by each connection point is located.

[0065] Based on the modulo operation of the connection order n and the number of poles 2P of the motor, the connection points are regrouped according to the number of motor poles to obtain the order k of the poles of each connection point.

[0066] The position r(n) of different layers in the stator slot is obtained by taking the modulo operation of the conductor layer number M and connection sequence n in the stator slot where each connection point is located.

[0067] Branch 1 determines the angular position θ1(n) of the connection point in the circumferential direction based on the order k of the pole where each connection point is located and the position r(n) in the slot.

[0068] The angular position θ2(n) of each connection point of branch 2 is the same as the angular position θ1(n) of the odd-numbered layer of branch 1 when the conductor layer number position M is an even-numbered layer, and the angular position θ1(n) of the even-numbered layer of branch 1 when the conductor layer number position M is an odd-numbered layer.

[0069] The angle positions θ3(n) of branch three and θ4(n) of branch four are respectively mathematically calculated based on branch one and branch two, with the number of stator slots A divided by the number of poles 2P as the factor.

[0070] The flat wire conductor is wound based on the angle position θ, connection order n, layer position M, pole order k, and slot position r (n) of each parallel branch obtained above.

[0071] Through the implementation of Embodiment 3 of this invention, and by studying the winding structure, winding manufacturing process, and winding design method of the flat wire motor, a design method for the stator of a flat wire motor has been developed. This innovative flat wire motor winding structure simplifies the winding manufacturing process, reduces loop current loss, lowers harmonic content, and reduces AC resistance loss, overcoming many shortcomings of existing technologies and significantly improving the overall performance of the flat wire motor. The number of motor turns can be adjusted by changing the number of parallel branches, adapting to different vehicle voltage platforms and power performance requirements. This scheme simplifies the stator end winding structure and avoids circulating currents between multiple parallel branches of each phase winding, thus improving motor efficiency.

[0072] In Embodiment 3 of the present invention, in the stator slot number A, pole number 2P, stator slot layer number 2m from the inside out, and connection sequence n, A, P, m, and n are all positive integers, and the angular position θ is... .

[0073] The position (θ, r) of each conductor is defined in polar coordinates, where r = 1, 2, 3, ..., 2m. Different parallel branches of the winding are connected by the connection points of each conductor to form 4 parallel branches according to the connection sequence formula n = 1, 2, 3, ..., 2Pm. The V phase, W phase and U phase have the same winding method but differ in position by 2π / 3P. When determining the position M of the conductor layer, the formula is used. To obtain the value of the conductor layer number position M; When obtaining the order k of the poles where each connection point is located, the formula is used. To obtain the numerical value of the order k of the pole where each connection point is located; When obtaining the slot positions r(n) of different layers within the stator slot, the formula is used. To obtain the position r(n) within the slot; The formula for calculating the angular position θ1(n) of branch 1 is simplified to: ; The formula for calculating the angle position θ2(n) of the branch is simplified to: ; The formula for calculating the three angular positions θ3(n) of the branch is simplified to: ; The formula for calculating the four-angle position θ4(n) of the branch is simplified as follows: ; When there are 2 parallel branches, connect (r(n), θ1(n)) and (r(n), θ3(n)) to form L1, and connect (r(n), θ2(n)) and (r(n), θ4(n)) to form L2; or connect (r(n), θ1(n)) and (r(n), θ4(n)) to form L1, and connect (r(n), θ2(n)) and (r(n), θ3(n)) to form L2. When there is 1 parallel branch, connect (r(1), θ2(n)) with (r(1), θ4(n)), connect (r(n), θ1(n)) with (r(n), θ4(n)), and connect (r(n), θ2(n)) with (r(n), θ3(n)) to form a loop.

[0074] The winding method and flat wire motor stator of the present invention will be described below with more specific and detailed embodiments and various examples.

[0075] In this detailed embodiment, the stator of the flat wire motor consists of a stator body, flat wire windings, and insulating paper. The stator body has stator slots, and the insulating paper is inserted into the stator slots to insulate the flat wire windings from the stator body. The flat wire windings are wound in the following manner: Determine the required flat wire platform for the motor, and based on the flat wire platform, obtain the number of stator slots A, number of poles 2P, and number of layers 2m from the inside to the outside of the stator slot for the flat wire motor to be prepared. r is the number of conductors in the stator slot. Determine the flat wire windings with parallel branches of one, two, and four. Calculate the angular position θ of each stator slot in the planar circumferential direction; Determine the connection sequence n of the points to be connected in each parallel branch of the three phases U, V, and W; In the above, A, P, m, and n are all positive integers, and the angular position θ is... The position (θ, r) of each conductor is defined in polar coordinates, where r = 1, 2, 3, ..., 2m. Different parallel branches of the winding are connected by the connection points of each conductor to form 4 parallel branches according to the connection sequence formula n = 1, 2, 3, ..., 2Pm. The V phase, W phase and U phase have the same winding method but are at the same position, which differs by 2π / 3P.

[0076] Based on the connection sequence n of each connection point and the number of poles 2P of the motor, determine the conductor layer number M in the stator slot where the conductor represented by each connection point is located. ; Based on the modulo operation of the connection order n and the number of motor poles 2P, the connection points are regrouped according to the number of motor poles to obtain the order k of the poles of each connection point. ; The position r(n) of different layers in the stator slot is obtained by taking the modulo operation of the conductor layer number M and the connection sequence n in the stator slot, which represents the conductor at each connection point. ; Branch 1 determines the angular position θ1(n) of the connection point in the circumferential direction based on the order k of the pole where each connection point is located and the position r(n) in the slot. ; The angular position θ2(n) of each connection point in branch 2 is the same as the angular position θ1(n) of the odd-numbered layers in branch 1 when the conductor layer number M is an even-numbered layer, and the same as the angular position θ1(n) of the even-numbered layers in branch 1 when the conductor layer number M is an odd-numbered layer. ; The angle positions θ3(n) of branch three and θ4(n) of branch four are respectively mathematically calculated based on branch one and branch two, with the number of stator slots A divided by the number of poles 2P as the factor: , .

[0077] The flat wire conductor is wound based on the angle position θ, connection order n, layer position M, pole order k, and slot position r (n) of each parallel branch obtained above.

[0078] When there are 2 parallel branches, connect (r(n), θ1(n)) and (r(n), θ3(n)) to form L1, and connect (r(n), θ2(n)) and (r(n), θ4(n)) to form L2; or connect (r(n), θ1(n)) and (r(n), θ4(n)) to form L1, and connect (r(n), θ2(n)) and (r(n), θ3(n)) to form L2. When there is 1 parallel branch, connect (r(1), θ2(n)) with (r(1), θ4(n)), connect (r(n), θ1(n)) with (r(n), θ4(n)), and connect (r(n), θ2(n)) with (r(n), θ3(n)) to form a loop.

[0079] Example 1.

[0080] In Example 1, when the stator of the flat wire motor is selected, A=48, 2P=8, 2m=6, n=1, 2, 3, 4, ..., 24.

[0081] When there are 4 parallel branches, the U-phase winding method can be referenced. Figure 2 , Figure 3 As shown, the polar coordinates of the conductors in each parallel branch U1, U2, U3, and U4 of phase U are as follows: U1=(0,1)(6π / 24,2)(13π / 24,1)(19π / 24,2)(24π / 24,1)(30π / 24,2)(37π / 24,1)(43π / 24,2)(π / 24,3)(7π / 24,4)(12π / 24,3)(18π / 24,4) (25π / 24,3) (31π / 24,4) (36π / 24,3) (42π / 24,4) (0,5) (6π / 24,6) (13π / 24,5) (19π / 24,6) (24π / 24,5) (30π / 24,6) (37π / 24,5) (43π / 24,6); U2= (π / 24,1) (7π / 24,2) (12π / 24,1) (18π / 24,2) (25π / 24,1) (31π / 24,2) (36π / 24,1) (42π / 24,2) (0,3) (6π / 24,4) (13π / 24,3) (19π / 24,4) (2 4π / 24,3) (30π / 24,4) (37π / 24,3) (43π / 24,4) (π / 24,5) (7π / 24,6) (12 π / 24,5) (18π / 24,6) (25π / 24,5) (31π / 24,6) (36π / 24,5) (42π / 24,6); U3=(6π / 24, 1)(12π / 24, 2)(19π / 24, 1)(25π / 24, 2)(30π / 24, 1)(36π / 24, 2)(43π / 24, 1)(49π / 24, 2)(7π / 24, 3)(13π / 24, 4)(18π / 24, 3)(24π / 24, 4)(31π / 24, 3)(37π / 24, 4)(42π / 24, 3)(48π / 24, 4)(6π / 24, 5)(12π / 24, 6)(19π / 24, 5)(25π / 24, 6)(30π / 24, 5)(36π / 24, 6)(43π / 24, 5)(49π / 24, 6); U4=(7π / 24, 1)(13π / 24, 2)(18π / 24, 1)(24π / 24, 2)(31π / 24, 1)(37π / 24, 2)(42π / 24, 1)(48π / 24, 2)(6π / 24, 3)(12π / 24, 4)(19π / 24, 3)(25π / 24, 4)(30π / 24, 3)(36π / 24, 4)(43π / 24, 3)(49π / 24, 4)(7π / 24, 5)(13π / 24, 6)(18π / 24, 5)(24π / 24, 6)(31π / 24, 5)(37π / 24, 6)(42π / 24, 5)(48π / 24, 6).

[0082] When the number of parallel branches is 2, the U-phase winding arrangement can refer to Figure 4 shown below (Mode 1), and the polar coordinates of the conductors in each parallel branch L1 and L2 in the U phase are as follows: L1 = (0, 1) (6π / 24, 2) (13π / 24, 1) (19π / 24, 2) (24π / 24, 1) (30π / 24, 2) (37π / 24, 1) (43π / 24, 2) (π / 24, 3) (7π / 24, 4) (12π / 24, 3) (18π / 24, 4) (25π / 24, 3) (31π / 24, 4) (36π / 24, 3) (42π / 24, 4) (0, 5) (6π / 24, 6) (13π / 24, 5) (19π / 24, 6) (24π / 24, 5) (30π / 24, 6) (37π / 24, 5) (43π / 24, 6) (49π / 24, 6) (43π / 24, 5) (36π / 24, 6) (30π / 24, 5) (25π / 24, 6) (19π / 24, 5) (12π / 24, 6) (6π / 24, 5) (48π / 24, 4) (42π / 24, 3) (37π / 24, 4) (31π / 24, 3) (24π / 24, 4) (18π / 24, 3) (13π / 24, 4) (7π / 24, 3) (49π / 24, 2) (43π / 24, 1) (36π / 24, 2) (30π / 24, 1) (25π / 24, 2) (19π / 24, 1) (12π / 24, 2) (6π / 24, 1); L2 = (π / 24, 1) (7π / 24, 2) (12π / 24, 1) (18π / 24, 2) (25π / 24, 1) (31π / 24, 2) (36π / 24, 1) (42π / 24, 2) (0, 3) (6π / 24, 4) (13π / 24, 3) (19π / 24, 4) (24π / 24, 3) (30π / 24, 4) (37π / 24, 3) (43π / 24, 4) (π / 24, 5) (7π / 24, 6) (12π / 24, 5) (18π / 24, 6) (25π / 24, 5) (31π / 24, 6) (36π / 24, 5) (42π / 24, 6) (48π / 24, 6) (42π / 24, 5) (37π / 24, 6) (31π / 24, 5) (24π / 24, 6) (18π / 24, 5) (13π / 24, 6) (7π / 24, 5) (49π / 24, 4) (43π / 24, 3) (36π / 24, 4) (29π / 24, 3) (25π / 24, 4) (19π / 24, 3) (12π / 24, 4) (6π / 24, 3) (48π / 24, 2) (42π / 24, 1) (37π / 24, 2) (31π / 24, 1) (24π / 24, 2) (18π / 24, 1) (13π / 24, 2) (7π / 24, 1).

[0083] When the number of parallel branches is 2, the U-phase winding method can also be Figure 5 as shown in the figure (Mode 2), wherein the polar coordinates of the conductors in each parallel branch L1 and L2 of the U phase are as follows: L1=(0,1)(6π / 24,2)(13π / 24,1)(19π / 24,2)(24π / 24,1)(30π / 24,2)(37π / 24,1)(43π / 24,2)(π / 24,3)(7π / 24,4)(12π / 24,3)(18π / 24,4)(25π / 24,3)(31π / 24,4)(36π / 24,3)(42π / 24,4)(0,5)(6π / 24,6)(13π / 24,5)(19π / 24,6)(24π / 24,5)(30π / 24,6)(37π / 24,5)(43π / 24,6)(48π / 24,6)(42π / 24,5)(37π / 24,6)(31π / 24,5)(24π / 24,6)(18π / 24,5)(13π / 24,6)(7π / 24,5)(49π / 24,4)(43π / 24,3)(36π / 24,4)(30π / 24,3)(25π / 24,4)(19π / 24,3)(12π / 24,4)(6π / 24,3)(48π / 24,2)(42π / 24,1)(37π / 24,2)(31π / 24,1)(24π / 24,2)(18π / 24,1)(13π / 24,2)(7π / 24,1); L2=(π / 24, 1)(7π / 24, 2)(12π / 24, 1)(18π / 24, 2)(25π / 24, 1)(31π / 24, 2)(36π / 24, 1)(42π / 24, 2)(0, 3)(6π / 24, 4)(13π / 24, 3)(19π / 24, 4)(24π / 24, 3)(30π / 24, 4)(37π / 24, 3)(43π / 24, 4)(π / 24, 5)(7π / 24, 6)(12π / 24, 5)(18π / 24, 6)(25π / 24, 5)(31π / 24, 6)(36π / 24, 5)(42π / 24, 6)49π / 24, 6)(43π / 24, 5)(36π / 24, 6)(30π / 24, 5)(25π / 24, 6)(19π / 24, 5)(12π / 24, 6)(6π / 24, 5)(48π / 24, 4)(42π / 24, 3)(37π / 24, 4)(31π / 24, 3)(24π / 24, 4)(18π / 24, 3)(13π / 24, 4)(7π / 24, 3)(49π / 24, 2)(43π / 24, 1)(36π / 24, 2)(30π / 24, 1)(25π / 24, 2)(19π / 24, 1)(12π / 24, 2)(6π / 24, 1).

[0084] When the number of parallel branches is 1, the winding arrangement of U phase may also be as Figure 6 shown, where the polar coordinates of the flat conductors are as follows: (0,1)(6π / 24,2)(13π / 24,1)(19π / 24,2)(24π / 24,1)(30π / 24,2)(37π / 24,1)(43π / 24,2)(π / 24,3)(7π / 24,4)(12π / 24,3)(18π / 24,4)(25π / 24,3)(31π / 24,4)(36π / 24,3)(42π / 24,4)(0,5)(6π / 24,6)(13π / 24,5)(19π / 24,6)(24π / 24,5)(30π / 24,6)(37π / 24,5)(43π / 24,6)(48π / 24,6)(42π / 24,5)(37π / 24,6)(31π / 24,5)(24π / 24,6)(18π / 24,5)(13π / 24,6)(7π / 24,5)(49π / 24,4)(43π / 24,3)(36π / 24,4)(30π / 24,3)(25π / 24,4)(19π / 24,3)(12π / 24,4)(6π / 24,3)(48π / 24,2)(42π / 24,1)(37π / 24,2)(31π / 24,1)(24π / 24,2)(18π / 24,1)(13π / 24,2)(7π / 24,1)(π / 24,1)(7π / 24,2)(12π / 24,1)(18π / 24,2)(25π / 24,1)(31π / 24,2)(36π / 24,1)(42π / 24,2)(0,3)(6π / 24,4)(13π / 24,3)(19π / 24,4)(24π / 24,3)(30π / 24,4)(37π / 24,3)(43π / 24,4)(π / 24,5)(7π / 24,6)(12π / 24,5)(18π / 24,6)(25π / 24,5)(31π / 24,6)(36π / 24,5)(42π / 24,6)(49π / 24,4)(43π / 24,3)(36π / 24,4)(29π / 24,3)(25π / 24,4)(19π / 24,3)(12π / 24,4)(6π / 24,3)(48π / 24,2)(42π / 24,1)(37π / 24,2)(31π / 24,1)(24π / 24,2)(18π / 24,1)(13π / 24,2)(7π / 24,1).

[0085] Example 2.

[0086] In Example 2, for a flat wire motor stator, when the number of stator slots is selected as A=72, the number of poles is 2P=12, the number of conductor layers is 2m=10, and the connection sequence is n=1, 2, 3, 4, ⋯, 60. When the number of parallel branches is 4, the connection of each point is as follows: U1=（0，1）（6π / 36，2）（13π / 36，1）（19π / 36，2）（24π / 36，1）（30π / 36，2）（37π / 36，1）（43π / 36，2）（48π / 36，1）（54π / 36，2）（61π / 36，1）（67π / 36，2）（π / 36，3）（7π / 36，4）（12π / 36，3）（18π / 36，4）（25π / 36，3）（31π / 36，4）（36π / 36，3）（42π / 36，4）（49π / 36，3）（55π / 36，4）（60π / 36，3）（66π / 36，4）（0，5）（6π / 36，6）（13π / 36，5）（19π / 36，6）（24π / 36，5）（30π / 36，6）（37π / 36，5）（43π / 36，6）（48π / 36，5）（54π / 36，6）（61π / 36，5）（67π / 36，6）（π / 36，7）（7π / 36，8）（12π / 36，7）（18π / 36，8）（25π / 36，7）（31π / 36，8）（36π / 36，7）（42π / 36，8）（49π / 36，7）（55π / 36，8）（60π / 36，7）（66π / 36，8）（0，9）（6π / 36，10）（13π / 36，9）（19π / 36，10）（24π / 36，9）（30π / 36，10）（37π / 36，9）（43π / 36，10）（48π / 36，9）（54π / 36，10）（61π / 36，9）（67π / 36，10）； U2=（π / 36，1）（7π / 36，2）（12π / 36，1）（18π / 36，2）（25π / 36，1）（31π / 36，2）（36π / 36，1）（42π / 36，2）（49π / 36，1）（55π / 36，2）（60π / 36，1）（66π / 36，2）（0，3）（6π / 36，4）（13π / 36，3）（19π / 36，4）（24π / 36，3）（30π / 36，4）（37π / 36，3）（43π / 36，4）（48π / 36，3）（54π / 36，4）（61π / 36，3）（67π / 36，4）（π / 36，5）（7π / 36，6）（12π / 36，5）（18π / 36，6）（25π / 36，5）（31π / 36，6）（36π / 36，5）（42π / 36，6）（49π / 36，5）（55π / 36，6）（60π / 36，5）（66π / 36，6）（0，7）（6π / 36，8）（13π / 36，7）（19π / 36，8）（24π / 36，7）（30π / 36，8）（37π / 36，7）（43π / 36，8）（48π / 36，7）（54π / 36，8）（61π / 36，7）（67π / 36，8）（π / 36，9）（7π / 36，10）（12π / 36，9）（18π / 36，10）（25π / 36，9）（31π / 36，10）（36π / 36，9）（42π / 36，10）（49π / 36，9）（55π / 36，10）（60π / 36，7）（66π / 36，10）； U3=（6π / 36，1）（12π / 36，2）（19π / 36，1）（25π / 36，2）（30π / 36，1）（36π / 36，2）（43π / 36，1）（49π / 36，2）（54π / 36，1）（60π / 36，2）（67π / 36，1）（73π / 36，2）（7π / 36，3）（13π / 36，4）（18π / 36，3）（24π / 36，4）（31π / 36，3）（37π / 36，4）（42π / 36，3）（48π / 36，4）（55π / 36，3）（61π / 36，4）（66π / 36，3）（72π / 36，4）（6π / 36，5）（12π / 36，6）（19π / 36，5）（25π / 36，6）（30π / 36，5）（36π / 36，6）（43π / 36，5）（49π / 36，6）（54π / 36，5）（60π / 36，6）（67π / 36，5）（73π / 36，6）（7π / 36，7）（13π / 36，8）（18π / 36，7）（24π / 36，8）（31π / 36，7）（37π / 36，8）（42π / 36，7）（48π / 36，8）（55π / 36，7）（61π / 36，8）（66π / 36，7）（72π / 36，8）（6π / 36，9）（12π / 36，10）（19π / 36，9）（25π / 36，10）（30π / 36，9）（36π / 36，10）（43π / 36，9）（49π / 36，10）（54π / 36，9）（60π / 36，10）（67π / 36，9）（73π / 36，10）； U4=(7π / 36, 1)(13π / 36, 2)(18π / 36, 1)(24π / 36, 2)(31π / 36, 1)(37π / 36, 2)(42π / 36, 1)(48π / 36, 2)(55π / 36, 1)(61π / 36, 2)(66π / 36, 1)(72π / 36, 2)(6π / 36, 3)(12π / 36, 4)(19π / 36, 3)(25π / 36, 4)(30π / 36, 3)(36π / 36, 4)(43π / 36, 3)(49π / 36, 4)(54π / 36, 3)(60π / 36, 4)(67π / 36, 3)(73π / 36, 4)(7π / 36, 5)(13π / 36, 6)(18π / 36, 5)(24π / 36, 6)(31π / 36, 5)(37π / 36, 6)(42π / 36, 5)(48π / 36, 6)(55π / 36, 5)(61π / 36, 6)(66π / 36, 5)(72π / 36, 6)(6π / 36, 7)(12π / 36, 8)(19π / 36, 7)(25π / 36, 8)(30π / 36, 7)(36π / 36, 8)(43π / 36, 7)(49π / 36, 8)(54π / 36, 7)(60π / 36, 8)(67π / 36, 7)(73π / 36, 8)(7π / 36, 9)(13π / 36, 10)(18π / 36, 9)(24π / 36, 10)(31π / 36, 9)(37π / 36, 10)(42π / 36, 9)(48π / 36, 10)(55π / 36, 9)(61π / 36, 10)(66π / 36, 9)(72π / 36, 10).

[0087] Example 3.

[0088] In Example 3, for a flat wire motor stator, select the number of stator slots A=96, the number of poles 2P=16, the number of conductor layers 2m=8, and the connection sequence n=1, 2, 3, 4, ⋯, 64. When the number of parallel branches is 4, the connection of each point is as follows: U1=（0，1）（6π / 48，2）（13π / 48，1）（19π / 48，2）（24π / 48，1）（30π / 48，2）（37π / 48，1）（43π / 48，2）（48π / 48，1）（54π / 48，2）（61π / 48，1）（67π / 48，2）（72π / 48，1）（78π / 48，2）（85π / 48，1）（91π / 48，2）（π / 48，3）（7π / 48，4）（12π / 48，3）（18π / 48，4）（25π / 48，3）（31π / 48，4）（36π / 48，3）（42π / 48，4）（49π / 48，3）（55π / 48，4）（60π / 48，3）（66π / 48，4）（73π / 48，3）（79π / 48，4）（84π / 48，3）（90π / 48，4）（0，5）（6π / 48，6）（13π / 48，5）（19π / 48，6）（24π / 48，5）（30π / 48，6）（37π / 48，5）（43π / 48，6）（48π / 48，5）（54π / 48，6）（61π / 48，5）（67π / 48，6）（72π / 48，5）（78π / 48，6）（85π / 48，5）（91π / 48，6）（π / 48，7）（7π / 48，8）（12π / 48，7）（18π / 48，8）（25π / 48，7）（31π / 48，8）（36π / 48，7）（42π / 48，8）（49π / 48，7）（55π / 48，8）（60π / 48，7）（66π / 48，8）（73π / 48，7）（79π / 48，8）（84π / 48，7）（90π / 48，8）； U2=（π / 48，1）（7π / 48，2）（12π / 48，1）（18π / 48，2）（25π / 48，1）（31π / 48，2）（36π / 48，1）（42π / 48，2）（49π / 48，1）（55π / 48，2）（60π / 48，1）（66π / 48，2）（73π / 48，1）（79π / 48，2）（84π / 48，1）（90π / 48，2）（0，3）（6π / 48，4）（13π / 48，3）（19π / 48，4）（24π / 48，3）（30π / 48，4）（37π / 48，3）（43π / 48，4）（48π / 48，3）（54π / 48，4）（61π / 48，3）（67π / 48，4）（72π / 48，3）（78π / 48，4）（85π / 48，3）（91π / 48，4）（π / 48，5）（7π / 48，6）（12π / 48，5）（18π / 48，6）（25π / 48，5）（31π / 48，6）（36π / 48，5）（42π / 48，6）（49π / 48，5）（55π / 48，6）（60π / 48，5）（66π / 48，6）（73π / 48，5）（79π / 48，6）（84π / 48，5）（90π / 48，6）（0，7）（6π / 48，8）（13π / 48，7）（19π / 48，8）（24π / 48，7）（30π / 48，8）（37π / 48，7）（43π / 48，8）（48π / 48，7）（54π / 48，8）（61π / 48，7）（67π / 48，8）（72π / 48，7）（78π / 48，8）（85π / 48，7）（91π / 48，8）； U3=（6π / 48，1）(12π / 48，2）（19π / 48，1）（25π / 48，2）（30π / 48，1）（36π / 48，2）（43π / 48，1）（49π / 48，2）（54π / 48，1）（60π / 48，2）（67π / 48，1）（73π / 48，2）（78π / 48，1）（84π / 48，2）（91π / 48，1）（97π / 48，2）（7π / 48，3）（13π / 48，4）（18π / 48，3）（24π / 48，4）（31π / 48，3）（37π / 48，4）（42π / 48，3）（48π / 48，4）（55π / 48，3）（61π / 48，4）（66π / 48，3）（72π / 48，4）（79π / 48，3）（85π / 48，4）（92π / 48，3）（96π / 48，4）（6π / 48，5）（12π / 48，6）（19π / 48，5）（25π / 48，6）（30π / 48，5）（36π / 48，6）（43π / 48，5）（49π / 48，6）（54π / 48，5）（60π / 48，6）（67π / 48，5）（73π / 48，6）（78π / 48，5）（84π / 48，6）（91π / 48，5）（97π / 48，6）（7π / 48，7）（13π / 48，8）（18π / 48，7）（24π / 48，8）（31π / 48，7）（37π / 48，8）（42π / 48，7）（48π / 48，8）（55π / 48，7）（61π / 48，8）（66π / 48，7）（72π / 48，8）（79π / 48，7）（85π / 48，8）（92π / 48，7）（96π / 48，8）； U4=(7π / 48, 1)(13π / 48, 2)(18π / 48, 1)(24π / 48, 2)(31π / 48, 1)(37π / 48, 2)(42π / 48, 1)(48π / 48, 2)(55π / 48, 1)(61π / 48, 2)(66π / 48, 1)(72π / 48, 2)(79π / 48, 1)(85π / 48, 2)(92π / 48, 1)(96π / 48, 2)(6π / 48, 3)(12π / 48, 4)(19π / 48, 3)(25π / 48, 4)(30π / 48, 3)(36π / 48, 4)(43π / 48, 3)(49π / 48, 4)(54π / 48, 3)(60π / 48, 4)(67π / 48, 3)(73π / 48, 4)(78π / 48, 3)(84π / 48, 4)(91π / 48, 3)(97π / 48, 4)(7π / 48, 5)(13π / 48, 6)(18π / 48, 5)(24π / 48, 6)(31π / 48, 5)(37π / 48, 6)(42π / 48, 5)(48π / 48, 6)(55π / 48, 5)(61π / 48, 6)(66π / 48, 5)(72π / 48, 6)(79π / 48, 5)(85π / 48, 6)(92π / 48, 5)(96π / 48, 6)(6π / 48, 7)(12π / 48, 8)(19π / 48, 7)(25π / 48, 8)(30π / 48, 7)(36π / 48, 8)(43π / 48, 7)(49π / 48, 8)(54π / 48, 7)(60π / 48, 8)(67π / 48, 7)(73π / 48, 8)(78π / 48, 7)(84π / 48, 8)(91π / 48, 7)(97π / 48, 8).

[0089] Example 4.

[0090] In Example 4, for the stator of a flat wire motor, select the number of stator slots A=96, the number of poles 2P=16, the number of conductor layers 2m=6, and the connection sequence n=1, 2, 3, 4, ⋯, 48. When the number of parallel branches is 4, the connection of each point is as follows: U1=(0,1)(6π / 48,2)(13π / 48,1)(19π / 48,2)(24π / 48,1)(30π / 48,2)(37π / 48,1)(43π / 48,2)(48π / 48,1)(54π / 48,2)(61π / 48,1)(67π / 48,2)(72π / 48,1)(78π / 48,2)(85π / 48,1)(91π / 48,2)(π / 48,3)(7π / 48,4)(12π / 48,3)(18π / 48,4)(25π / 48,3)(31π / 48,4)(36π / 48,3)(42π / 48,4) (49π / 48,3) (55π / 48,4) (60π / 48,3) (66π / 48,4) (73π / 48,3) (79π / 48,4) (84π / 48,3) (90π / 48,4) (0,5) (6π / 48,6) (13π / 48,5) (19π / 48,6) (24π / 48,5) (30π / 48,6) (37π / 48,5) (43π / 48,6) (48π / 48,5) (54π / 48,6) (61π / 48,5) (67π / 48,6) (72π / 48,5) (78π / 48,6) (85π / 48,5) (91π / 48,6); U2=(π / 48,1)(7π / 48,2)(12π / 48,1)(18π / 48,2)(25π / 48,1)(31π / 48,2)(36π / 48,1)(42π / 48,2)(49π / 48,1)(55π / 48,2)(60π / 48,1)(66π / 48,2)(73π / 48,1)(79π / 48,2)(84π / 48,1)(90π / 48,2)(0,3)(6π / 48,4)(13π / 48,3)(19π / 48,4)(24π / 48,3)(30π / 48,4)(37π / 48,3)(43π / 48,4)(4 8π / 48,3)(54π / 48,4)(61π / 48,3)(67π / 48,4)(72π / 48,3)(78π / 48,4)(85π / 48,3)(91π / 48,4)(π / 48,5)(7π / 48,6)(12π / 48,5)(18π / 48,6)(25π / 48,5)(31π / 48,6)(36π / 48,5)(42π / 48,6)(49π / 48,5)(55π / 48,6)(60π / 48,5)(66π / 48,6)(73π / 48,5)(79π / 48,6)(84π / 48,5)(90π / 48,6); U3=(6π / 48,1)(12π / 48,2)(19π / 48,1)(25π / 48,2)(30π / 48,1)(36π / 48,2)(43π / 48,1)(49π / 48,2)(54π / 48,1)(60π / 48,2)(67π / 48,1)(73π / 48,2)(78π / 48,1)(84π / 48,2)(91π / 48,1)(97π / 48,2)(7π / 48,3)(13π / 48,4)(18π / 48,3)(24π / 48,4)(31π / 48,3)(37π / 48,4)(42π / 48,3)(48π / 48,4 )(55π / 48,3)(61π / 48,4)(66π / 48,3)(72π / 48,4)(79π / 48,3)(85π / 48,4)(92π / 48,3)(96π / 48,4)(6π / 48,5)(12π / 48,6)(19π / 48,5)(25π / 48,6)(30π / 48,5)(36π / 48,6)(43π / 48,5)(49π / 48,6)(54π / 48,5)(60π / 48,6)(67π / 48,5)(73π / 48,6)(78π / 48,5)(84π / 48,6)(91π / 48,5)(97π / 48,6); U4=(7π / 48,1)(13π / 48,2)(18π / 48,1)(24π / 48,2)(31π / 48,1)(37π / 48,2)(42π / 48,1)(48π / 48,2)(55π / 48,1)(61π / 48,2)(66π / 48,1)(72π / 48,2)(79π / 48,1)(85π / 48,2)(92π / 48,1)(96π / 48,2)(6π / 48,3)(12π / 48,4)(19π / 48,3)(25π / 48,4)(30π / 48,3)(36π / 48,4)(43π / 48,3)(49π / 48,4 )(54π / 48,3)(60π / 48,4)(67π / 48,3)(73π / 48,4)(78π / 48,3)(84π / 48,4)(91π / 48,3)(97π / 48,4)(7π / 48,5)(13π / 48,6)(18π / 48,5)(24π / 48,6)(31π / 48,5)(37π / 48,6)(42π / 48,5)(48π / 48,6)(55π / 48,5)(61π / 48,6)(66π / 48,5)(72π / 48,6)(79π / 48,5)(85π / 48,6)(92π / 48,5)(96π / 48,6).

[0091] The design method for the flat wire motor stator of this invention enables complete symmetry in all parallel branches. Furthermore, this method allows for rapid design of the winding pattern under different voltage platforms and power performance requirements of vehicles, avoiding incomplete symmetry between multiple parallel branches in each phase of the wound flat wire winding. A comparison is then provided below between incomplete symmetry in the branches of the flat wire winding and the complete symmetry achieved using this invention. (See reference...) Figures 8 to 19 As shown, the explanation is based on flux linkage, current, winding losses, and torque waveforms.

[0092] like Figure 8 The figure shows the three-phase load flux linkage waveforms when the branches are not perfectly symmetrical under the condition of an external current source input; as shown... Figure 9 The figure shows the load flux waveform when all branches are perfectly symmetrical and there is an external current source input.

[0093] like Figure 14 The figure shows the three-phase no-load flux linkage waveform when the external current source input is 0 and the branches are not perfectly symmetrical. Figure 15 As shown, the waveform of the three-phase no-load flux linkage is displayed when the external current source input is 0 and all branches are completely symmetrical.

[0094] like Figure 10 The diagram illustrates the three-phase load currents when the branches are not perfectly symmetrical under an external current source input. Figure 11 As shown, the three-phase load current is displayed when all branches are perfectly symmetrical under the condition that there is an external current source input.

[0095] like Figure 16 The figure shows the three-phase no-load current when the external current source input is 0 and the branches are not perfectly symmetrical. Figure 17 As shown, the three-phase no-load current is displayed when the external current source input is 0 and all branches are completely symmetrical.

[0096] like Figure 12 As shown, this diagram illustrates the comparison of winding losses when the branches are not perfectly symmetrical and are perfectly symmetrical, provided there is an external current source input.

[0097] like Figure 18 As shown, this diagram illustrates the comparison of winding losses when the external current source input is 0, with and without complete symmetry in each branch.

[0098] like Figure 13 As shown, this diagram illustrates the torque comparison between incompletely symmetrical and completely symmetrical branches when an external current source is input.

[0099] like Figure 19As shown, the torque comparison between the branches when the external current source input is 0 and when they are not completely symmetrical and are completely symmetrical is illustrated.

[0100] When an external current source is input, and the branches are not perfectly symmetrical, the flux linkage waveforms will not perfectly overlap, such as... Figure 8 As shown, due to the different magnetic flux linkages between the two branches of the same phase, the induced voltages generated in each branch cannot be completely canceled out. Since the two branches are connected in parallel, a loop current will be generated between them, leading to current imbalance between the two branches of the same phase and severe distortion of the current waveform, such as... Figure 10 As shown.

[0101] When an external current source is input, and all branches are perfectly symmetrical, the flux linkage waveforms will completely overlap, such as... Figure 9 As shown, at this time, because the induced voltages generated in different branches of the same phase cannot be completely canceled out, no loop current is generated between the two branches, and the current waveforms completely overlap, as shown in the figure. Figure 11 As shown.

[0102] When an external current source is input, the winding losses and torque waveforms of the branches under conditions of incomplete and complete symmetry are as follows: Figure 12 and Figure 13 As shown, it can be seen that compared with the case where all branches are completely symmetrical, when the branches are not completely symmetrical, the winding loss is greater, the average output torque is lower, and the torque fluctuation is greater. All of these have an adverse effect on the motor performance, resulting in reduced motor efficiency and increased vibration and noise.

[0103] When there is no external current source input, and the branches are not perfectly symmetrical, the flux linkage waveforms will also not perfectly overlap, such as... Figure 14 As shown, at this time, due to the different magnetic flux between two different branches of the same phase, the induced voltages generated by each branch cannot be completely canceled out. Since the two branches are in parallel, even without an external current source input, the induced voltages between different branches will still generate a loop current between the two branches. The currents in the two winding branches of the same phase are in opposite directions, such as... Figure 16 As shown.

[0104] When there is no external current source input, and all branches are perfectly symmetrical, the flux linkage waveforms completely overlap, such as... Figure 15 As shown, there is no induced voltage between different branches at this time, and the current in each winding branch is 0. Figure 17 As shown.

[0105] When there is no external current source input, the winding losses and torque waveforms of the branches under conditions of incomplete and complete symmetry are as follows: Figure 18 and Figure 19As shown, compared to the case where all branches are perfectly symmetrical, when the branches are not perfectly symmetrical, even without an external current source input, winding losses will occur in the windings due to the presence of branch currents, and the motor will exhibit a negative average torque. Furthermore, torque fluctuations increase significantly, generating additional losses and vibration noise.

[0106] Therefore, by adopting the above embodiments of the present invention, a stator winding with a simplified structure and completely symmetrical parallel branches can be quickly designed for different voltage platforms and power performance requirements of vehicles. The winding manufacturing process is simplified, which can reduce loop current loss, reduce harmonic content, and reduce AC resistance loss, thereby overcoming many defects of the prior art and achieving the purpose of the present invention.

[0107] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A flat wire motor stator, characterized in that: The stator of the flat wire motor consists of a stator body, flat wire windings, and insulating paper. The stator body is provided with stator slots, and the insulating paper is inserted into the stator slots to insulate the flat wire windings from the stator body. The flat wire motor has A stator slots, 2P poles, 2m layers from the inside to the outside of the stator slots, and r conductors in the stator slots. The flat wire windings are defined as having one, two, and four parallel branches. The angular position θ of each stator slot in the planar circumferential direction is 2π / A; The connection sequence of the connection points of each parallel branch in the three phases U, V, and W is n, where n = 1, 2, 3, ..., 2Pm; The conductor layer number M within the stator slot represented by each connection point is determined by the following formula: ; The order k of the poles at each connection point is obtained by the following formula: ; The position r(n) within the stator slot for different layers is obtained by the following formula: ; The angular position θ1(n) of the connection point of branch one in the circumferential direction is determined by the formula. To determine; The angular position θ2(n) of each connection point of branch 2 is the same as the angular position θ1(n) of the odd-numbered layer of branch 1 when the conductor layer number position M is an even-numbered layer, and the angular position θ1(n) of the even-numbered layer of branch 1 when the conductor layer number position M is an odd-numbered layer. The angle positions θ3(n) of branch three and θ4(n) of branch four are respectively calculated by offsetting by 1A / 2P based on branch one and branch two. The flat wire conductor is wound based on the angle position θ, connection order n, layer position M, pole order k, and slot position r (n) of each parallel branch obtained above.

2. The flat wire motor stator according to claim 1, characterized in that: The flat wire conductor in the flat wire winding has two ends extending out of the stator slot, forming a crown end and a weld end, respectively, and the crown end and the weld end are separate.

3. The flat wire motor stator according to claim 1, characterized in that: In the scheme with two parallel branches, branch one and branch three are connected, and branch two and branch four are connected, or branch one and branch four are connected, and branch two and branch three are connected, based on the scheme with four parallel branches. In the scheme with one parallel branch, branch two is connected to branch one, based on the scheme with two parallel branches.

4. A flat wire motor stator according to claim 1, characterized in that: In the stator slot number A, pole number 2P, stator slot layer number 2m from the inside out, and connection sequence n, A, P, m, and n are all positive integers, and the angular position θ is... .

5. A flat wire motor stator according to claim 4, characterized in that: The position (θ, r) of each conductor is defined in polar coordinates, where r = 1, 2, 3, ..., 2m. Different parallel branches of the winding are connected by the connection points of each conductor to form 4 parallel branches according to the connection sequence formula n = 1, 2, 3, ..., 2Pm. The V phase, W phase and U phase have the same winding method but are at the same position, which differs by 2π / 3P.

6. A flat wire motor stator according to claim 5, characterized in that: The formula for calculating the angle position θ2(n) of the branch is simplified to: ; The formula for calculating the three angular positions θ3(n) of the branch is simplified to: ; The formula for calculating the four-angle position θ4(n) of the branch is simplified to: .

7. A flat wire motor stator according to claim 6, characterized in that: When there are 2 parallel branches, connect (r(n), θ1(n)) and (r(n), θ3(n)) to form L1, and connect (r(n), θ2(n)) and (r(n), θ4(n)) to form L2; or connect (r(n), θ1(n)) and (r(n), θ4(n)) to form L1, and connect (r(n), θ2(n)) and (r(n), θ3(n)) to form L2. When there is 1 parallel branch, connect (r(1), θ2(n)) with (r(1), θ4(n)), connect (r(n), θ1(n)) with (r(n), θ4(n)), and connect (r(n), θ2(n)) with (r(n), θ3(n)) to form a loop.

8. A flat wire motor, characterized in that, The flat wire motor includes a flat wire motor stator as described in any one of claims 1 to 7.

9. A design method for a flat wire motor stator, characterized in that, The design method includes: Determine the required flat wire platform for the motor, and based on the flat wire platform, obtain the number of stator slots A, the number of poles 2P, the number of layers 2m from the inside to the outside of the stator slots of the flat wire motor to be prepared, where r is the number of conductors in the stator slots, and determine the flat wire windings with parallel branches of one, two, and four. Calculate the angular position θ of each stator slot in the plane circumferential direction, where θ is 2π / A; Determine the connection sequence n of the connection points in each parallel branch of the three phases U, V, and W. The connection sequence n is the logical number used to identify each connection point in the electrical connection path of the corresponding parallel branch, where n = 1, 2, 3, ..., 2Pm. Based on the connection sequence n of each connection point and the number of poles 2P of the motor, determine the conductor layer position M in the stator slot represented by each connection point. M is determined by the following formula: ; Based on the modulo operation of the connection order n and the number of motor poles 2P, the connection points are regrouped according to the number of motor poles to obtain the order k of the poles of each connection point. ; The position r(n) of different layers in the stator slot is obtained by taking the modulo operation of the conductor layer number M and the connection sequence n in the stator slot, which represents the conductor at each connection point. ; Branch 1 determines the angular position θ1(n) of the connection point in the circumferential direction based on the order k of the pole where each connection point is located and the position r(n) in the slot. ; The angular position θ2(n) of each connection point of branch 2 is the same as the angular position θ1(n) of the odd-numbered layer of branch 1 when the conductor layer number position M is an even-numbered layer, and the angular position θ1(n) of the even-numbered layer of branch 1 when the conductor layer number position M is an odd-numbered layer. The angle positions θ3(n) of branch three and θ4(n) of branch four are calculated by adding an offset angle A / 2P to the angle positions of branch one and branch two respectively. The flat wire conductor is wound based on the angle position θ, connection order n, layer position M, pole order k, and slot position r (n) of each parallel branch obtained above.

10. The design method for a flat wire motor stator according to claim 9, characterized in that: In the stator slot number A, pole number 2P, stator slot layer number 2m from the inside out, and connection sequence n, A, P, m, and n are all positive integers, and the angular position θ is... ; The position (θ, r) of each conductor is defined in polar coordinates, where r = 1, 2, 3, ..., 2m. Different parallel branches of the winding are connected by the connection points of each conductor to form 4 parallel branches according to the connection sequence formula n = 1, 2, 3, ..., 2Pm. The V phase, W phase and U phase have the same winding method but differ in position by 2π / 3P. When determining the position M of the conductor layer, the formula is used. To obtain the value of the conductor layer number position M; When obtaining the order k of the poles where each connection point is located, the formula is used. To obtain the numerical value of the order k of the pole where each connection point is located; When obtaining the position r(n) within the stator slot for different layers, the formula is used. To obtain the position r(n) within the slot; The formula for calculating the angular position θ1(n) of branch 1 is simplified to: ; The formula for calculating the angle position θ2(n) of the branch is simplified to: ; The formula for calculating the three angular positions θ3(n) of the branch is simplified to: ; The formula for calculating the four-angle position θ4(n) of the branch is simplified to: ; When there are 2 parallel branches, connect (r(n), θ1(n)) and (r(n), θ3(n)) to form L1, and connect (r(n), θ2(n)) and (r(n), θ4(n)) to form L2; or connect (r(n), θ1(n)) and (r(n), θ4(n)) to form L1, and connect (r(n), θ2(n)) and (r(n), θ3(n)) to form L2. When there is 1 parallel branch, connect (r(1), θ2(n)) with (r(1), θ4(n)), connect (r(n), θ1(n)) with (r(n), θ4(n)), and connect (r(n), θ2(n)) with (r(n), θ3(n)) to form a loop.

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