Flat wire motor, power assembly and vehicle
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUAWEI ELECTRICAL POWER TECH CO LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-08-07
AI Technical Summary
如此会导致槽楔占用定子槽部的空间，减小定子槽部内的扁线的体积，从而降低铜满率
[0008] In the flat wire motor provided in this application embodiment, since a thinner slot shoulder is used, a thicker slot wedge is eliminated, which can avoid the slot wedge occupying the space of the slot, thereby increasing the volume of the flat wire in the slot and thus improving the copper fill factor of the motor stator.
Smart Images
Figure CN224610573U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of flat wire motor technology, and more particularly to a flat wire motor, powertrain, and vehicle. Background Technology
[0002] Currently, with the increasing demands for improved performance of generators and drive motors in the power systems of new energy vehicles, hairpin flat wire motors are widely used due to their high copper fill factor. However, they suffer from problems such as numerous welding points, high copper loss, and non-compact structure.
[0003] In related technologies, the use of waveform windings can eliminate hundreds of solder joints, reduce copper losses, and make the stator windings more compact. This results in fewer solder joints, lower copper losses, and facilitates the miniaturization of flat wire motors.
[0004] However, for waveform windings, since the flat wire is inserted into the stator slot from the inside of the stator radially without being cut, the slot width needs to be greater than the width of the flat wire. This makes it impossible to install a thin slot shoulder to prevent the flat wire from moving into the stator. Instead, a thicker slot wedge is placed at the top of the stator slot (e.g., on the side closer to the inside of the stator) to cover the flat wire, thus preventing it from moving radially into the stator. This results in the slot wedge occupying space in the stator slot, reducing the volume of the flat wire within the slot and consequently lowering the copper fill factor. Furthermore, the presence of the slot wedge reduces the insulation distance between the flat wire and the stator teeth; the stator's noise, vibration, and harshness (NVH) are also worsened by the larger slot width. Utility Model Content
[0005] This application provides a flat wire motor, powertrain, and vehicle to remove slot wedges in a flat wire motor employing waveform windings, thereby improving the copper fill factor, insulation space distance, and NVH of the motor stator.
[0006] To achieve the above objectives, this application adopts the following technical solution:
[0007] A first aspect of this application provides a flat wire motor employing a waveform winding, comprising a plurality of teeth, a plurality of slots, and insulating paper. The plurality of teeth are spaced apart circumferentially along the motor stator. Each tooth includes a tooth body and two slot shoulders, the two slot shoulders being symmetrically arranged about the tooth body and located inside the tooth body. Each slot is defined by two adjacent teeth. Each slot includes a slot body and an opening. A flat wire is disposed within the slot body. The opening is defined by two slot shoulders on the mutually adjacent sides of the two adjacent teeth, and the width of the opening is less than the width of the slot body. The insulating paper is disposed within the slot and located between the flat wire and the teeth. The insulating paper extends radially inward along the motor stator, and a portion of the insulating paper facing radially inward toward the motor stator is adapted to the shape of the slot shoulders. A varnish layer is provided on the surface of the flat wire within the slot body near the opening along the radial direction of the motor stator; this surface is the radially inward surface of the flat wire near the motor stator. The slot shoulder is configured to prevent the flat wire from moving to the inside of the motor stator. Along the radial direction of the motor stator, the thickness of the slot shoulder is less than a preset threshold, and the flat wire is configured to be inserted into the slot from the axial end face of the motor stator.
[0008] In the flat wire motor provided in this application embodiment, since a thinner slot shoulder is used, a thicker slot wedge is eliminated, which can avoid the slot wedge occupying the space of the slot, thereby increasing the volume of the flat wire in the slot and thus improving the copper fill factor of the motor stator.
[0009] In some embodiments, the two slot shoulders are located at both ends of the tooth body along the circumferential direction of the motor stator and extend in a direction away from each other.
[0010] In some embodiments, a portion of the insulating paper is located within the opening, and another portion of the insulating paper is located within the slot body; along the radial direction of the motor stator, the side of the flat wire closest to the opening abuts against the slot shoulder via the insulating paper.
[0011] In some embodiments, the insulating paper is entirely located within the slot body; along the radial direction of the motor stator, the side of the flat wire closest to the opening is spaced a predetermined distance from the slot shoulder.
[0012] In some embodiments, the width of the opening is any value between 40% and 70% of the width of the groove body.
[0013] In some embodiments, the distance between the tip of the insulating paper and the surface of the flat wire is greater than or equal to 0.5 mm along the radial direction of the motor stator.
[0014] In some embodiments, the thickness of the varnish layer along the radial direction of the motor stator is greater than 0.15 mm.
[0015] In some embodiments, the thickness of the groove shoulder is 1 mm.
[0016] A second aspect of this application provides a powertrain including a reducer and a flat wire motor as described in the first aspect, the flat wire motor being drivenly connected to the reducer.
[0017] A third aspect of this application provides a vehicle including wheels and the powertrain described in the second aspect above, the powertrain being used to drive the wheels.
[0018] The powertrain and vehicle provided in this application include the aforementioned flat wire motor. Therefore, the powertrain and vehicle provided in this application solve the same technical problems and have the same technical effects as the flat wire motor in the above-mentioned technical solutions, and will not be repeated here. Attached Figure Description
[0019] Figure 1 This is a partial structural diagram of a motor stator in related technologies;
[0020] Figure 2 This is a partial structural diagram of another type of motor stator in related technologies;
[0021] Figure 3 A schematic diagram of the structure of a vehicle provided in this application embodiment;
[0022] Figure 4 This is a schematic diagram of the structure of a powertrain provided in an embodiment of this application;
[0023] Figure 5 One of the partial structural schematic diagrams of a flat wire motor provided in an embodiment of this application;
[0024] Figure 6 This is a second partial structural schematic diagram of a flat wire motor provided in an embodiment of this application;
[0025] Figure 7A A partial structural diagram of a motor stator provided in an embodiment of this application;
[0026] Figure 7B A partial structural diagram of another motor stator provided in an embodiment of this application;
[0027] Figure 8 A schematic diagram of the stator core in the stator of the flat wire motor provided in the embodiments of this application;
[0028] Figure 9 for Figure 8 A magnified view of a section at point A in the middle circle;
[0029] Figure 10 This is a schematic diagram of a continuous wave winding of flat wire in the stator winding of a flat wire motor in an embodiment of this application;
[0030] Figure 11 This is a schematic diagram illustrating the manufacturing process of continuously wave-wound flat wire in the stator winding of a flat wire motor according to an embodiment of this application.
[0031] Figure label:
[0032] 10000 - Vehicle; 1000 - Powertrain; 2000 - Wheels; 3000 - Transmission mechanism;
[0033] 100 - Flat wire motor; 200 - Reducer;
[0034] 10-Motor rotor;
[0035] 20-Motor stator; 201-Stator core; 202-Stator winding; 203-Gear; 204-Slot wedge; Flat wire-205; Insulating paper-206; Opening-207; Slot body-208; Slot section-209; Varnish layer-210; Slot shoulder-211; Gear body-212; Straight section-121; Bridging section-122a, 122b; Connecting section-123; Lead-out end-126; Slot wedge body-2041; Locking part-2042. Detailed Implementation
[0036] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0037] In the accompanying drawings of the embodiments of this application, solid structures such as parts and components are represented by guide lines; hollow structures such as openings, holes, spaces, and cavities are represented by guide lines with arrows.
[0038] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in further detail below with reference to the accompanying drawings. Figure 1 This is a partial structural diagram of a motor stator in related technologies.
[0039] Reference Figure 1The motor stator 40 employs a hairpin winding and includes a tooth portion 203 and a slot portion 209. The slot portion 209 includes an opening 207 and a slot body 208. The width W1 of the opening 207 is any value between 25% and 50% of the width W0 of the slot body 208 (W1 = W0 × 25% ~ W0 × 50%). The motor stator 30 also includes insulating paper 206. The tooth portion 203 includes a slot shoulder 211, and the insulating paper 206 near the slot shoulder 211 is bi-folded. For example, if the thickness of the insulating paper 206 is approximately 0.25 mm, then the thickness of the bi-folded insulating paper 206 is approximately 0.5 mm. The insulation space distance W4 between the tip A of the flat wire 205 and the tip B of the tooth portion 203 is greater than 2.5 mm.
[0040] However, hairpin windings have problems such as numerous solder joints, high copper losses, and a non-compact structure. For example, hairpin flat wires need to be re-soldered after being cut at about 300 points, and the coil length also increases due to soldering requirements (e.g., an increase of 10mm to 30mm per turn).
[0041] In related technologies, the above problems can be solved by using waveform windings. Furthermore, axially compact and high-torque concentrated winding axial motors have also been developed to improve the performance of generators and drive motors. For flat-wire motors using waveform windings, slot shoulders that would create obstacles are not provided to facilitate flat wire insertion; however, this leads to a significant deterioration in NVH performance. Moreover, once the flat wire is inserted into the slot, it easily slips out radially inward from the slot; therefore, a locking part 2041 (see reference) is required. Figure 2 A large slot wedge is used, positioned at the top of the stator slot (e.g., near the inner side of the stator), to prevent the flat wires from coming loose. Furthermore, the electrical insulation of the flat wires within the stator slots also depends to some extent on the slot wedge. However, the presence of the slot wedge leads to a reduction in copper fill factor.
[0042] Figure 2 This is a partial structural diagram of another type of motor stator in related technologies.
[0043] For example, refer to Figure 2 The motor stator 30 includes a toothed portion 203, a slotted portion 209, and a slotted wedge 204. The slotted portion 209 includes an opening 207 and a slotted body 208. The slotted wedge 204 is disposed within the slotted portion 209 and located at the opening 207. The slotted wedge 204 includes a slotted wedge body 2041 and two locking portions 2042. The slotted wedge body 2041 extends circumferentially from both ends of the motor stator 30 in a direction away from each other to form the two locking portions 2042. The motor stator 30 also includes insulating paper 206. A flat wire 205 is disposed within the slotted portion 209, and the insulating paper 206 is disposed between the flat wire 205 and the toothed portion 203. The slotted wedge 204 is closer to the radially inner side of the motor stator 30 than the flat wire 205.
[0044] Reference Figure 2 In the motor stator 30, gaps exist between the mating surfaces of the slot wedge 204 and the insulating paper 206; the insulation space distance W4 between the flat wire 205 and the tooth 203 is too small, for example, W4 is less than or equal to 0.4mm (W4≤0.4mm); the thickness W2 of the slot wedge 204 is too thick, for example, W2 is about 2.5mm, the slot wedge 204 occupies the space of the slot 204, reducing the volume of the flat wire 205 in the slot 204, thereby reducing the copper fill factor; the opening of the slot 209 is too large, the width W1 of the opening 207 is the same as the width W0 of the slot body 208 (W1=W0), which worsens NVH. Thus, there is considerable room for improvement in the motor's NVH, copper fill factor, and insulation space distance. In addition, due to the need for complex production equipment, production costs will also increase.
[0045] To address the aforementioned problems, embodiments of this application provide a vehicle that is a new energy vehicle powered by electricity. In some embodiments, the new energy vehicle is a pure electric vehicle, a hybrid electric vehicle, or a fuel cell electric vehicle. In other embodiments, the new energy vehicle is a vehicle that uses a high-efficiency energy storage device such as a supercapacitor, flywheel battery, or flywheel energy storage device as its power source.
[0046] Figure 3 This is a structural schematic diagram of a vehicle provided in an embodiment of this application.
[0047] Reference Figure 3 The vehicle 10000 includes wheels 2000 and a powertrain 1000. The powertrain 1000 is used to drive the wheels 2000 to rotate, thereby enabling the vehicle 10000 to move.
[0048] Reference Figure 3 The vehicle 1000 also includes a transmission mechanism 3000, which is used to drive the powertrain 1000 and the wheels 2000. The powertrain 1000 converts electrical energy into mechanical energy and drives the wheels 2000 to rotate through the transmission mechanism 3000, thereby enabling the vehicle 1000 to move.
[0049] exist Figure 3 In the given embodiment, the powertrain 1000 is used to drive the rear wheels (wheels 2000 on the side closest to the rear of the vehicle) of the vehicle 10000 to rotate, and the front wheels of the vehicle 10000 are used to achieve steering. The vehicle 10000 is more responsive when steering and more stable when cornering.
[0050] In other embodiments, the powertrain 1000 is used to drive the front wheels (wheels 2000 on the side closest to the front of the vehicle) of the vehicle 10000 to rotate. The front wheels are used to achieve driving and steering. The front-wheel drive system has a simple structure, fewer parts, lighter weight, reduced power loss, higher transmission efficiency, and lower fuel consumption and cost.
[0051] Figure 4 This is a schematic diagram of a powertrain provided in an embodiment of this application.
[0052] Reference Figure 4 The structure shown in the dashed box is the powertrain 1000, which includes a flat wire motor 100 and a reducer 200. The flat wire motor 100 and the reducer 200 are connected in a transmission connection. The flat wire motor 100 converts electrical energy into rotational mechanical energy and outputs torque to the reducer 200. The reducer 200 includes a gear set (not shown). The reducer 200 reduces the rotational speed and increases the torque through the gear set, and transmits the power to the transmission mechanism 3000. The transmission mechanism 3000 then transmits the power to the wheel 2000 to drive the wheel 2000 to rotate.
[0053] Figure 5 This is one of the partial structural schematic diagrams of a flat wire motor provided in an embodiment of this application. Figure 6 This is a second partial structural schematic diagram of a flat wire motor provided in an embodiment of this application. The diagram illustrates the axial direction, circumferential direction, and radial direction of the motor stator 20.
[0054] Reference Figure 5 and Figure 6 The stator 20 of the flat wire motor includes a stator core 201 and a stator winding 202. The stator winding 202 includes multiple flat wires 205. The surface of each flat wire 205 is coated with an insulating varnish (such as polyesterimide, polyamideimide, etc.) to prevent short circuits between adjacent flat wire turns within the same coil, between different coils, and between the coil and the core (stator).
[0055] Figure 7A This is a partial structural diagram of a motor stator provided in an embodiment of this application.
[0056] In some embodiments, refer to Figure 6 and Figure 7AThe motor stator 20 employs a wave winding and includes multiple teeth 203 and multiple slots 209. The multiple teeth 203 are spaced apart circumferentially around the motor stator 20, and each tooth 203 includes a tooth body 212 and two slot shoulders 211. The multiple tooth bodies 212 are arranged circumferentially around the motor stator 20 and extend radially around the motor stator 20. The two slot shoulders 211 are symmetrically arranged about the tooth bodies 212. The two slot shoulders 211 are located inside the tooth bodies 212, where "inner" refers to the side of the tooth body closest to the central axis of the motor stator 20, and the two slot shoulders 211 are located at opposite ends of the tooth bodies 212 circumferentially around the motor stator 20, extending away from each other. The slot shoulders 211 are configured to prevent the flat wire 205 from moving into the inner side of the motor stator 20.
[0057] In some embodiments, the thickness W5 of the slot shoulder 211 along the radial direction of the motor stator 20 is less than a preset threshold. For example, the thickness W5 of the slot shoulder 211 is approximately 1 mm. The preset threshold can be referenced to the thickness W2 of the slot wedge 204 in related technologies (e.g., 2.5 mm). This reduces the space occupied in the slot portion 209, increases the amount of flat wire 205 used, and thereby improves the copper fill factor of the motor stator 20.
[0058] Reference Figure 7A Each groove 209 is defined by two adjacent teeth 203. A flat line 205 is provided within the groove 209. The groove 209 includes a groove body 208 and an opening 207. The opening 207 is defined by two adjacent groove shoulders 211 of the two adjacent teeth 203. The flat line 205 is provided within the groove body 208, and the width W1 of the opening 207 is less than the width W0 of the groove body 208.
[0059] It should be noted that the width of the groove body 208 refers to the width within the groove portion 209.
[0060] In some embodiments, the width W0 of the slot body 208 is approximately equal to the width W6 of the flat wire 205. Since the width W1 of the opening 207 is smaller than the width W6 of the flat wire 205, the flat wire 205 cannot be inserted into the slot 209 radially along the stator. In this case, the flat wire 205 can be inserted into the slot 209 from the axial end face of the motor stator 20.
[0061] The following text combines Figures 8 to 11 For example, if the width W1 of the opening 207 is less than the width W6 of the flat wire 205, the flat wire 205 can still be inserted into the slot 209 from the axial end face of the motor stator 20.
[0062] Figure 8 This is a schematic diagram of the stator core in the stator of a flat wire motor provided in an embodiment of this application. For example... Figure 8As shown, the stator core 201 includes two end faces S1 and S2. The two end faces S1 and S2 are opposite to each other along the axial direction of the stator core 201.
[0063] like Figure 8 As shown, the stator core 201 includes a central hole CH. The central hole CH is used to accommodate the motor rotor. Along the axial direction of the stator core 201, the central hole CH penetrates through the two end faces S1 and S2 of the stator core 201.
[0064] like Figure 8 As shown, the stator core 201 includes a plurality of slots 209. Each slot 209 extends axially through two end faces S1 and S2 of the stator core 201. The plurality of slots 209 are arranged at circumferential intervals along the stator core 201. Radially along the stator core 201, each slot 209 faces the central hole CH of the stator core 201.
[0065] In this embodiment, each slot 209 includes a slot opening, a slot bottom, and two openings. The slot opening and slot bottom of each slot 209 are arranged opposite each other radially along the stator core 201. In each slot 209, the slot opening faces the center hole CH of the stator core 201, and the two openings are arranged opposite each other axially along the stator core 201.
[0066] Figure 9 for Figure 8 A magnified view of a section at point A in the middle circle. (See image below.) Figure 9 As shown, along the circumference of the stator core 201, the slot opening width of each slot 209 is smaller than the slot inner width of each slot 209, so that each slot 209 in the stator core 201 forms a narrow slot opening, thereby improving the NVH performance of the motor.
[0067] Wherein, the slot opening width of each slot 209 is the circumferential width of the portion of each slot 209 used to connect the central hole CH, and the slot inner width of each slot 209 is the circumferential width of the portion of each slot 209 used to accommodate the flat wire winding. For ease of explanation, the slot opening width (width of the opening 207) of each slot 209 is a first width W1, and the slot inner width (width of the slot body 208) of each slot 209 is a second width W0, wherein the slot inner width W0 of each slot 209 is greater than the slot opening width W1 of each slot 209. Figure 9 As shown, W0 is greater than W1.
[0068] Figure 10 This is a schematic diagram of a continuously wave-wound flat wire in the stator winding of a flat wire motor according to an embodiment of this application. In this embodiment, the stator winding includes multiple continuously wave-wound flat wires 205. Figure 10As shown, each continuous wave-wound flat wire 205 includes multiple straight segments 121, multiple bridging segments 122a and 122b, and two leads 126.
[0069] Each straight segment 121 is arranged in a slot 209. The two ends of each bridging segment 122a or 122b are used to connect two straight segments 121 in different slots 209, and each lead-out end 126 is used to connect one straight segment 121.
[0070] like Figure 10 As shown, each continuous wave-wound flat wire 205 also includes multiple connecting segments 123. The two ends of a bridging segment 122a are respectively connected to two straight segments 123 through two connecting segments 123.
[0071] Figure 11 This is a schematic diagram illustrating the manufacturing process of continuously wave-wound flat wire in the stator winding of a flat wire motor according to an embodiment of this application.
[0072] Reference Figure 9 and Figure 11 Along the circumference of the stator core 201, the slot opening width of each slot 209 is a first width W1, the slot inner width of each slot 209 is a second width W0, the line width of each connecting segment 123 is a third width W8, and the line width of each straight segment 121 or each bridging segment 122a (122b) is a fourth width W9. Wherein, the first width W1 is less than the second width W0, the third width W8 is less than the first width W1, the first width W1 is less than the fourth width W9, and the fourth width W9 is less than the second width W0.
[0073] In the flat wire motor provided in this application embodiment, the slot 209 of the stator core 201 of the motor stator 410 adopts a narrow slot opening. A connecting segment 123 is provided at the connection point between each bridging segment 122a and the straight segment 121 in each continuous wave-wound flat wire 205 of the stator winding, thus forming a narrow waist segment. This narrow waist segment of the continuous wave-wound flat wire 205 avoids the narrow slot opening of the stator core 201, thereby enabling the continuous wave-wound flat wire 205 to be installed into multiple slots 209 of the stator core 201 along the axial direction of the stator core 201. In the flat wire motor 400 provided in this application embodiment, not only is it unnecessary to widen the slot opening of the slot 209, but it also enables the continuous wave-wound flat wire 205 to be assembled along the axial direction of the stator core 201. This not only improves the assembly efficiency of the motor stator 410 but also takes into account the NVH performance of the flat wire motor.
[0074] Compared to Figure 2In some embodiments of the motor stator 20 disclosed herein, a thinner slot shoulder 211 is used, eliminating the need for a thicker slot wedge 204. This avoids the slot wedge 204 occupying space in the slot portion 209, thereby increasing the volume of the flat wire 205 within the slot portion 209 and improving the copper fill factor of the motor stator 20. Furthermore, since the width W1 of the opening 207 is smaller than the width W6 of the flat wire 205, the flat wire 205 is prevented from moving into the inner side of the stator, which also helps improve the NVH (noise, vibration, and harshness) of the motor stator 20. In this case, the flat wire 205 can be inserted into the slot portion 209 from the axial end face of the motor stator 20, facilitating the formation of the stator winding 202.
[0075] and Figure 2 Compared to the motor stator 30 in the present disclosure, the motor stator 20 in some embodiments of the present disclosure omits the slot wedge 209, making the structure of the motor stator 20 simpler and reducing manufacturing costs.
[0076] In some embodiments, refer to Figure 7A The width W1 of the opening 207 is any value between 40% and 70% of the width W0 of the groove body 208. In this way, the width of the opening 207 is relatively small, which can further improve the NVH of the motor stator 20 while ensuring that the flat wire 205 can be inserted into the groove 209 from the axial end face of the motor stator 20.
[0077] In some embodiments, refer to Figure 7A The motor stator 20 also includes insulating paper 206, which is disposed in the slot 209 and located between the flat wire 205 and the tooth 203. The insulating paper 206 extends radially inward along the motor stator 20, and a portion of the insulating paper 206 near the inner side of the motor stator 20 is adapted to the shape of the slot shoulder 211.
[0078] In some embodiments, refer to Figure 7A Based on removing the slot wedge 204, by extending the length of the insulating paper 206 along the radial inner side of the motor stator 20 (for example, shortening the distance between the insulating paper 206 and the inner edge of the tooth 203 in the radial direction of the motor stator 20), the distance W4 between the tip of the insulating paper 206 and the tip of the flat wire 205 along the radial direction of the motor stator 20 can be greater than or equal to 0.5 mm. Here, the tip of the flat wire 205 can refer to the surface of the flat wire 205, which is the surface of the flat wire 205 near the radial inner side of the motor stator 20. That is, after removing the thick slot wedge 204, the tip of the insulating paper 206 is placed at a position at least 0.5 mm away from the tip of the flat wire 205. Here, the distance W4 between the tip of the insulating paper 206 and the tip of the flat wire 205 can also be considered as the distance by which the insulating paper 206 extends out of the slot body 208 along the radial direction of the motor stator 20. In this way, compared to Figure 2W4 in the figure is less than 0.4 mm. Figure 7A The insulation space distance in the motor stator 20 can be extended.
[0079] In some embodiments, refer to Figure 7A The distance W4 between the tip of the insulating paper 206 and the tip of the flat wire 205 is less than or equal to the thickness W5 of the slot shoulder 211 (e.g., 1 mm). This can prevent the insulating paper 206 from being damaged due to excessive length of the insulating paper 206 extending radially inward along the motor stator 20.
[0080] In some embodiments, refer to Figure 7A Along the radial direction of the motor stator 20, a varnish layer 210 is provided on the surface of the flat wire 205 closest to the opening 207 within the slot body 208. The varnish layer 210 is configured to provide electrical insulation for the flat wire 205.
[0081] In some embodiments, the thickness W3 of the varnish layer 210 along the radial direction of the motor stator 20 is greater than 0.15 mm (W3 > 0.15 mm) to ensure electrical insulation (e.g., insulation between the flat wire 205 and other components or the surrounding environment).
[0082] In some embodiments, refer to Figure 7A The thickness W3 of the varnish layer 210 is less than or equal to the distance W4 between the tip of the insulating paper 206 and the tip of the flat wire 205 (e.g., 0.5 mm).
[0083] In some embodiments of this disclosure, with the varnish insulating layer 210 as a premise, the insulating paper is lengthened in the inner diameter direction to increase the distance of the insulating space gap to more than 0.5 mm; in addition, with the varnish insulating layer 210 as a premise, the "thick slot wedge" is eliminated and the copper fill factor is improved.
[0084] In some embodiments, refer to Figure 7A A portion of the insulating paper 206 is located inside the opening 207, and another portion of the insulating paper 206 is located inside the slot body 208. Along the radial direction of the motor stator 20, the side of the flat wire 205 near the opening 207 abuts against the slot shoulder 211 through the insulating paper 206. Here, the flat wire 205 refers to the flat wire 205 inside the slot body 208 near the opening 207.
[0085] In some embodiments, refer to Figure 7B The insulating paper 206 is entirely located within the slot body 208. Along the radial direction of the motor stator 20, the side of the flat wire 205 near the opening 207 is spaced apart from the slot shoulder 211 by a predetermined distance.
[0086] For example, refer to Figure 7BThe length of the insulating paper 206 can be shortened along the radial direction of the motor stator 20 so that it does not cover the opening 207; and the flat wire 205 with the varnish layer 210 is moved along the radial outer side of the motor stator 20. Here, the distance that the flat wire 205 moves can be greater than or equal to the length of the shortened insulating paper 206 to ensure the insulation space distance.
[0087] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A flat wire motor (100) employing waveform windings, characterized in that, The stator (20) of the flat wire motor includes: Multiple teeth (203) are arranged at circumferential intervals along the motor stator (20), each tooth (203) comprising: Tooth body (212); and Two slotted shoulders (211) are symmetrically arranged about the tooth body (212) and located inside the tooth body (212); and Multiple slots (209), each slot (209) being defined by two adjacent teeth (203); the slots (209) include: A groove body (208), wherein a flat wire (205) is provided inside the groove body (208); and An opening (207) is defined by two groove shoulders (211) on the side of the two adjacent teeth (203) that are close to each other, and the width of the opening (207) is less than the width of the groove body (208). Insulating paper (206) is disposed in the groove (209) and located between the flat wire (205) and the tooth (203). The insulating paper (206) extends radially inward along the motor stator (20), and a portion of the insulating paper (206) radially inward toward the motor stator (20) is adapted to the shape of the groove shoulder (211). In this configuration, along the radial direction of the motor stator (20), the surface of the flat wire (205) near the opening (207) inside the slot body (208) is provided with a varnish layer (210), the surface being the radially inner side of the flat wire (205) near the motor stator (20); the slot shoulder (211) is configured to prevent the flat wire (205) from moving to the inner side of the motor stator (20); along the radial direction of the motor stator (20), the thickness of the slot shoulder (211) is less than a preset threshold, and the flat wire (205) is configured to be inserted into the slot (209) from the axial end face of the motor stator (20).
2. The flat wire motor (100) according to claim 1, characterized in that, The two slot shoulders (211) are located at the two ends of the tooth body (212) along the circumference of the motor stator (20) and extend in a direction away from each other.
3. The flat wire motor (100) according to claim 2, characterized in that, A portion of the insulating paper (206) is located inside the opening (207), and another portion of the insulating paper (206) is located inside the slot body (208); along the radial direction of the motor stator (20), the side of the flat wire (205) near the opening (207) abuts against the slot shoulder (211) through the insulating paper (206).
4. The flat wire motor (100) according to claim 2, characterized in that, The insulating paper (206) is entirely located within the slot body (208); along the radial direction of the motor stator (20), the side of the flat wire (205) near the opening (207) is spaced apart from the slot shoulder (211) by a predetermined distance.
5. The flat wire motor (100) according to claim 3 or 4, characterized in that, The width (W1) of the opening (207) is any value between 40% and 70% of the width (W0) of the groove body (208).
6. The flat wire motor (100) according to claim 5, characterized in that, Along the radial direction of the motor stator (20), the distance (W4) between the tip of the insulating paper (206) and the surface of the flat wire (205) is greater than or equal to 0.5 mm.
7. The flat wire motor (100) according to claim 6, characterized in that, Along the radial direction of the motor stator (20), the thickness (W3) of the varnish layer (210) is greater than 0.15 mm.
8. The flat wire motor (100) according to claim 7, characterized in that, The thickness (W5) of the groove shoulder (211) is 1 mm.
9. A powertrain (1000), characterized in that, The powertrain (1000) includes: Reducer (200); and According to any one of claims 1 to 8, the flat wire motor (100) is connected to the reducer (200) in a transmission connection.
10. A vehicle (10000), characterized in that, The vehicle (10000) includes: Wheel (2000); and According to claim 9, the powertrain (1000) is used to drive the wheel (2000).