WO2024082444A1

WO2024082444A1 - Traction motor

Info

Publication number: WO2024082444A1
Application number: PCT/CN2022/143024
Authority: WO
Inventors: 乔长帅; 崔斯柳; 王成; 侯世旭; 钟博; 闫涛涛; 鲍泉; 唐子谋; 唐赢武; 卞苗苗; 刘雄建
Original assignee: 中车株洲电机有限公司
Priority date: 2022-10-17
Filing date: 2022-12-28
Publication date: 2024-04-25
Also published as: CN218183109U

Abstract

A traction motor, comprising a stator lead and a conductive ring. The stator lead is provided with a coil nose part, a first lead, and a second lead; the coil nose part protrudes from the edge to the center, a first lead head of the first lead penetrates through the center of the coil nose part and is led out outwards, and a second lead head of the second lead penetrates through the edge of the coil nose part and is led out outwards; the first lead head located outside the coil nose part extends straightly, the second lead head located outside the coil nose part is bent towards the first lead head and the second lead head and the first lead head are arranged side by side, and a plurality of ring bodies of the conductive ring are respectively arranged on the periphery of the first lead head and the second lead head which are arranged side by side. According to the traction motor, the bending degree of the first and second lead heads is reduced by adjusting the relative position relationship among the first lead head, the second lead head, and the coil nose part, the risk of lead insulation damage is reduced, a sufficient space for mounting the conductive ring is reserved around the coil nose part, and the structural compactness and stability of a plurality of parts are improved; such a configuration is suitable for motors having compact structures.

Description

A traction motor

This application claims the priority of the Chinese patent application filed with the China Patent Office on October 17, 2022, with application number 202222735336.5 and utility model name “A traction motor”, the entire contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of motors, and in particular to a traction motor.

Background technique

With the rapid development of rail transit, the voltage levels of traction motors are increasing, and low-voltage, high-current motors have emerged.

Most existing motor coils are wound with a single wire, which can pass a limited current. Although some high-current motors use double-wire winding for the motor coils, which can solve the problem of low current density, this will cause the thickness and stiffness of the coil leads to increase at their joint ends, making the aforementioned joint end structure prone to problems such as lead head insulation damage and copper exposure during the connection process. In addition, the joint end structure of the coil leads is complex in shape and occupies a large space, which is not conducive to the compact installation of the motor.

Utility Model Content

The purpose of the present application is to provide a traction motor which can improve the parallel structure of the stator lead wires and enhance the structural quality and assembly characteristics of the aforementioned parallel structure.

To achieve the above-mentioned purpose, the present application provides a traction motor, including a stator lead and a conductive ring; the stator lead has a coil nose, a first lead and a second lead; the coil nose protrudes from the edge to the center, the first lead head of the first lead is passed through the center of the coil nose and led outward, and the second lead head of the second lead is passed through the edge of the coil nose and led outward; the first lead head outside the coil nose extends straight, and the second lead head outside the coil nose is bent toward the first lead head and close together, and the multiple ring bodies of the conductive ring are arranged on the surrounding sides of the first lead head and the second lead head that are close together.

In some embodiments, all the ring bodies of the same conductive ring include a U ring, a V ring, a W ring and a neutral ring; all the ring bodies of the same conductive ring are grouped in pairs and are arranged on two opposite sides of the first lead head and the second lead head that are placed side by side.

In some embodiments, the first lead head is offset relative to the central axis of the coil nose in a direction away from the second lead head; two ring bodies of the same conductive ring are adjacent to the first lead head and arranged axially along the coil nose, and the other two ring bodies are adjacent to the second lead head and arranged radially along the coil nose.

In some embodiments, any stator lead further includes a binding portion for integrally binding the first lead head, the second lead head, and the conductive ring.

In some embodiments, a junction box is also included; the stator lead includes a first lead segment and a second lead segment; the coil nose, the first lead head and the second lead head are all arranged on the first lead segment, and the second lead segment includes a copper busbar connected to the junction box.

In some embodiments, the copper busbar is provided with at least two mounting holes and a first fastener penetrating the mounting holes and tightened to the junction box.

In some embodiments, the junction box is specifically a non-magnetic steel junction box having an L-shaped cavity; the copper busbar is disposed at a corner of the L-shaped cavity and is bent along the corner.

In some embodiments, it also includes a cable connected to the copper busbar; the junction box includes clamps distributed in pairs, pads distributed in pairs and arranged between a pair of clamps, a junction box bracket arranged between the pair of pads, and a second fastener for locking the pair of clamps; any clamp is provided with an open groove for the cable to be laterally embedded, and the openings of the open grooves of a pair of clamps face each other and are both toward the pad.

In some embodiments, the open groove is specifically a U-shaped groove; the second fastener is a countersunk threaded member provided between any one clamping plate and the backing plate, and the countersunk threaded members provided on the two clamping plates are staggered.

In some embodiments, it also includes a wiring terminal arranged between the copper busbar and the cable; the wiring terminal is sleeved with the cable and connected to the copper busbar; the wiring terminal has a step surface for clamping with the junction box; and multiple wiring terminals arranged on multiple cables are distributed opposite to each other in pairs.

Compared with the above-mentioned background technology, the traction motor provided in the present application includes a stator lead and a conductive ring; the stator lead has a coil nose, a first lead and a second lead; the coil nose protrudes from the edge to the center, the first lead head of the first lead is passed through the center of the coil nose and led outward, and the second lead head of the second lead is passed through the edge of the coil nose and led outward; the first lead head outside the coil nose extends straight, and the second lead head outside the coil nose is bent toward the first lead head and close together, and the multiple ring bodies of the conductive ring are arranged on the surrounding sides of the first lead head and the second lead head that are close together.

The traction motor provided by the present application allows the first lead head to be led out from the center of the coil nose and the second lead head to be led out from the edge of the coil nose. In the process of bringing the first lead and the second lead together to form a parallel head structure, the second lead head is bent toward the first lead head while the first lead head is not bent, which can reduce the bending degree of the first lead head and the second lead head and reduce the risk of lead insulation damage. The aforementioned parallel head structure of the first lead and the second lead can leave space for the installation of the conductive ring around the middle of the coil nose, so that the entire ring body of the conductive ring neatly and orderly surrounds the first lead head and the second lead head, making full use of the space where the coil nose is located, improving the structural compactness and stability of multiple components, and is suitable for motors with compact structures.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

FIG1 is a schematic diagram of the partial structure of a traction motor provided by an embodiment of the present application at a first lead head, a second lead head and a conductive ring;

FIG2 is a schematic diagram of the partial structure of the traction motor at the copper busbar and the junction box provided in an embodiment of the present application;

FIG3 is a schematic diagram of a partial structure of a traction motor at a cable and a junction box provided in an embodiment of the present application;

FIG4 is a schematic diagram of the assembly of the clamping plate, the backing plate, the second fastener and the cable provided in the embodiment of the present application;

FIG5 is a front view of FIG4;

FIG. 6 is a schematic diagram of the assembly of the cable and the terminal block provided in an embodiment of the present application.

Among them, 1-conductive ring, 11-U ring, 12-V ring, 13-W ring, 14-neutral ring, 21-coil nose, 22-first lead, 221-first lead head, 23-second lead, 231-second lead head, 232-copper bus, 2321-mounting hole, 3-winding part, 4-junction box, 41-clamp, 411-opening groove, 42-pad, 43-second fastener, 44-junction box bracket, 5-cable, 6-terminal.

Detailed ways

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

Please refer to Figures 1 to 6, Figure 1 is a schematic diagram of the local structure of the traction motor provided in an embodiment of the present application at the first lead head, the second lead head and the conductive ring; Figure 2 is a schematic diagram of the local structure of the traction motor provided in an embodiment of the present application at the copper bus and the junction box; Figure 3 is a schematic diagram of the local structure of the traction motor provided in an embodiment of the present application at the cable and the junction box; Figure 4 is an assembly schematic diagram of the splint, pad, second fastener and cable provided in an embodiment of the present application; Figure 5 is a front view of Figure 4; Figure 6 is an assembly schematic diagram of the cable and terminal provided in an embodiment of the present application.

Please refer to Figure 1. The present application provides a traction motor, including a stator lead and a conductive ring 1; in the traction motor, the stator lead includes a coil nose 21, a first lead 22 and a second lead 23. The coil nose 21 protrudes from the edge to the center, the first lead 22 has a first lead head 221, the first lead head 221 is passed through the center of the coil nose 21 and led outward, and the second lead 23 has a second lead head 231, the second lead head 231 is passed through the edge of the coil nose 21 and led outward.

In this embodiment, the first lead head 221 and the second lead head 231 are both led out from the inside of the coil nose 21 to the outside of the coil nose 21. It can be seen that part of the first lead head 221 is located inside the coil nose 21, part of the first lead head 221 is located outside the coil nose 21, part of the second lead head 231 is located inside the coil nose 21, and part of the second lead head 231 is located outside the coil nose 21. Among them, the first lead head 221 located outside the coil nose 21 extends straight, and the second lead head 231 located outside the coil nose 21 is bent toward the first lead head 221 and close together. The conductive ring 1 has a plurality of ring bodies, and all the ring bodies of the conductive ring 1 are arranged on the surrounding sides of the first lead head 221 and the second lead head 231 that are close together.

The traction motor optimizes the relative position relationship among the first lead head 221, the second lead head 231 and the coil nose 21, so that the first lead head 221 and the second lead head 231 are both close to and merged toward the middle of the coil nose 21. On the one hand, the bending degree of the first lead head 221 and the second lead head 231 can be reduced, specifically, only the second lead head 231 is bent and close to the first lead head 221 without bending the first lead head 221. This is beneficial to ensuring the structural strength of the lead heads, especially the first lead head 221, and can also reduce the squeezing of the coil nose 21; on the other hand, space for the installation of the conductive ring 1 can be reserved around the middle of the coil nose 21, so that the entire ring body of the conductive ring 1 neatly and orderly surrounds the first lead head 221 and the second lead head 231. Compared with the structure of the end of a common stator lead, the traction motor provided in the present application reduces the risk of lead insulation damage by reducing the degree of bending of the first and second lead heads, and reasonably arranges the first and second lead heads and the conductive ring 1 to fully utilize the space where the coil nose 21 is located, thereby improving the structural compactness and stability of multiple components, and is suitable for a compact motor.

The traction motor provided in the present application is further described below in conjunction with the accompanying drawings and implementation methods.

In some embodiments, as shown in FIG1 , the entire ring body of the conductive ring 1 may include a U ring 11, a V ring 12, a W ring 13 and a neutral ring 14; wherein the U ring 11, the V ring 12 and the W ring 13 correspond to the three phases of the motor respectively. When assembling the conductive ring 1 and the stator lead, the U ring 11, the V ring 12, the W ring 13 and the neutral ring 14 of the conductive ring 1 are grouped in pairs and arranged on two opposite sides of the first lead head 221 and the second lead head 231 that are placed side by side. For example, the U ring 11 and the V ring 12 of the conductive ring 1 are in the same group, and the W ring 13 and the neutral ring 14 of the conductive ring 1 are in the same group. The U ring 11 and the V ring 12 are on the same side of the first and second lead heads that are placed side by side, the W ring 13 and the neutral ring 14 are on the same side of the first and second lead heads that are placed side by side, and the U ring 11 and the W ring 13 are on the opposite sides of the first and second lead heads that are placed side by side, respectively.

Combined with the previous records, it can be known that in this traction motor, part of the first lead head 221 and part of the second lead head 231 extend out of the coil nose 21 and are close to the middle part of the coil nose 21, and the middle part of the coil nose 21 is raised relative to the edge of the coil nose 21. Therefore, a larger space is left at the edge of the coil nose 21, which can reasonably and effectively position and install the U-ring 11, V-ring 12, W-ring 13 and neutral ring 14.

Typically, the first lead head 221 is led out from the middle of the coil nose 21 but slightly deviates from the central axis of the coil nose 21. For example, the first lead head 221 is biased in a direction away from the second lead head 231. As shown in FIG1 , according to the distribution positions of the first and second lead heads in the coil nose 21, the coil nose 21 is divided into three parts: upper, middle, and lower parts. The second lead head 231 is led out from the upper part of the coil nose 21 and bent toward the middle part of the coil nose 21. The first lead head 221 is led out directly from the middle part of the coil nose 21, wherein the first lead head 221 is located at a lower position in the middle part of the coil nose 21. Based on the aforementioned distribution characteristics of the first and second lead heads relative to the coil nose 21, a larger space is left at the upper part of the coil nose 21 than at the lower part of the coil nose 21. Of course, limited by the bending tendency of the second lead head 231, the upper part of the coil nose 21 has a relatively smaller axial space and a relatively larger radial space. Therefore, two of the ring bodies of the conductive ring 1 can be radially arranged side by side at the upper part of the coil nose 21; as for the lower part of the coil nose 21, since the first lead head 221 extends straight, although the radial space is smaller, the axial space is relatively larger. The other two ring bodies of the conductive ring 1 can be axially arranged side by side at the lower part of the coil nose 21. At the same time, the first lead head 221 is not bent, which can also reduce the extrusion with the coil nose 21.

In short, for the same conductive ring 1, two ring bodies are adjacent to the first lead head 221 and are arranged along the axial direction of the coil nose 21, and the other two ring bodies are adjacent to the second lead head 231 and are arranged along the radial direction of the coil nose 21. This can maximize the use of the radial space and axial space of the stator lead, avoid lead insulation damage, and improve the application effect of the stator lead in the compact motor.

In the traction motor provided in the present application, the stator lead may also include a binding portion 3 for binding the first lead head 221, the second lead head 231 and the conductive ring 1, as shown in FIG1. When the first lead head 221, the second lead head 231 and the entire ring body of the conductive ring 1 are placed together according to the relative position relationship described above, the binding portion 3 may be used to wrap and bind the first lead head 221, the second lead head 231 and the entire ring body of the conductive ring 1, so that the first lead head 221, the second lead head 231 and the entire ring body of the conductive ring 1 form a stable and unified whole, thereby improving vibration resistance and environmental adaptability. Of course, according to the specific shape and size of the first lead head 221, the second lead head 231 and the conductive ring 1, some parts may be bound separately and then all parts may be bound.

With reference to FIG. 1 and FIG. 2 , in some embodiments, the traction motor provided in the present application further includes a junction box 4; in the traction motor, the stator lead includes a first lead segment and a second lead segment distributed along the length direction thereof, for example, the stator lead is divided into two along its length direction, one segment of the stator lead is the first lead segment, and the other segment of the stator lead is the second lead segment; the aforementioned first lead segment is provided with a coil nose 21, a first lead head 221 and a second lead head 231, and it can be seen that the first lead segment is used for assembly with the conductive ring 1; the aforementioned second lead segment is used for connection with the junction box 4. Generally, the second lead segment can be connected to the junction box 4 through a copper bus 232, for example, the first lead 22 and the second lead 23 of the second lead segment are directly processed by the copper bus 232, and there is no need to additionally weld lead joints to the first lead 22 and the second lead 23 of the second lead segment, so that the space of the junction box 4 can be fully utilized.

On the basis of the above embodiment, in order to improve the connection reliability between the second lead segment and the junction box 4, the copper busbar 232 is provided with at least two mounting holes 2321 and first fasteners respectively passing through each mounting hole 2321, and the first fasteners provided in the mounting holes 2321 are used to lock the copper busbar 232 and the junction box 4.

In some embodiments, the junction box 4 used in the present application is specifically a non-magnetic steel junction box 4, and the non-magnetic steel junction box 4 has an L-shaped cavity inside. When the copper busbar 232 and the non-magnetic steel junction box 4 are assembled, the copper busbar 232 can be arranged at the corner of the L-shaped cavity and bent along the corner, as shown in Figure 2. This example can avoid the eddy current effect generated by large current and improve the operating performance of the motor.

Referring to Figures 3 to 6, in some embodiments, the traction motor provided in the present application also includes a cable 5 connected to the copper bus 232. In order to conveniently and effectively position the cable 5, the junction box 4 may include clamps 41 distributed in pairs, pads 42 distributed in pairs and arranged between a pair of clamps 41, a junction box bracket 44 arranged between a pair of pads 42, and a second fastener 43 for locking the pair of clamps 41; wherein any one of the clamps 41 is provided with an open groove 411, and the openings of the open grooves 411 of a pair of clamps 41 face each other and are both toward the pad 42. When assembling the cable 5 and the junction box 4, firstly, the cable 5 is inserted into the opening groove 411 of any clamping plate 41 along the radial direction of the guide, so that the cable 5 is inserted into the opening groove 411 laterally; then, the two pads 42 and the two clamping plates 41 are pressed against the two opposite sides of the junction box bracket 44 from the inside to the outside in turn, at which time, the two pads 42 are pressed against the two opposite sides of the junction box bracket 44, and the two clamping plates 41 are pressed against the two opposite sides of the aforementioned two pads 42, and at the same time, the two clamping plates 41 can be locked and fixed by fasteners, so that the two clamping plates 41 firmly clamp the two pads 42 and the junction box bracket 44 therein, thereby clamping the cable 5. Usually, a clamping plate 41 can be provided with multiple opening grooves 411 for clamping multiple cables 5 respectively, for example, a clamping plate 41 can be provided with three opening grooves 411, and the six opening grooves 411 of the two clamping plates 41 can be used to clamp six cables 5 respectively. In this embodiment, a pair of clamping plates 41 have the same structure, and the opening slots 411 provided on the clamping plates 41 can be adapted to cables 5 of different shapes and sizes, thereby reducing the number of types of clamps for the cable 5 and the cost of making molds.

In the above embodiment, the opening groove 411 can be specifically set as a U-shaped groove; at the same time, a countersunk screw is provided between the backing plate 42 and any one of the clamping plates 41. In this example, the countersunk screw is used to lock a pair of clamping plates 41. For example, the countersunk screw provided on one of the clamping plates 41 penetrates and locks the backing plate 42 and the clamping plate 41, and the multiple countersunk screws provided on the two clamping plates 41 can fix both clamping plates 41 to the backing plate 42. Referring to Figure 5, the countersunk screws provided on the two clamping plates 41 are staggered.

On the basis of the above embodiment, the traction motor further includes a terminal 6 disposed between the copper busbar 232 and the cable 5; referring to FIG6 , the terminal 6 is sleeved on the end of the cable 5 and connected to the copper busbar 232, and the terminal 6 has a step surface that is engaged with the junction box. By controlling the local structural dimensions of the terminal 6, the current density requirements are met, and the terminal 6 is convenient for smoothly passing through the screwing member of the junction box 4 to connect the junction box 4, and the installation strength of the copper busbar 232 and the cable 5 in the junction box 4 can be improved. Among them, the terminal 6 with a step surface can be molded from a copper tube with a step.

A traction motor is provided with a plurality of cables 5. As shown in FIG6 , six cables 5 are installed in the traction motor. The six cables 5 can be arranged opposite to each other in pairs and close to each other, thus saving wiring space in the junction box.

In summary, the traction motor provided in the present application is designed with a new parallel head structure for the first lead segment of the stator lead, which can effectively avoid damage to the insulation layer of the lead head. In addition, the winding part 3 is used to bind the conductive ring 1 and the parallel head structure as a whole to achieve structural integration, thereby improving the vibration resistance of the stator and the structural compactness of the motor; the traction motor provided in the present application divides the stator lead into a first lead segment and a second lead segment, and the structural forms of the first and second lead segments are designed respectively according to different installation requirements at both ends of the stator lead along the length direction, which is convenient to install and reliable to connect; the junction box 4 connected to the second lead segment adopts non-magnetic steel to reduce eddy current effect. At the same time, the junction box 4 adopts a clamping plate 41 and a pad 42 to lock the cable 5, which is easy to operate and reduces costs.

The traction motor provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

A traction motor, characterized in that it comprises a stator lead and a conductive ring (1); the stator lead comprises a coil nose (21), a first lead (22) and a second lead (23); the coil nose (21) protrudes from the edge to the center, a first lead head (221) of the first lead (22) is passed through the center of the coil nose (21) and led outward, and a second lead head (231) of the second lead (23) is passed through the edge of the coil nose (21) and led outward; the first lead head (221) located outside the coil nose (21) extends straight, and the second lead head (231) located outside the coil nose (21) is bent toward the first lead head (221) and close together, and a plurality of ring bodies of the conductive ring (1) are arranged on the peripheral sides of the first lead head (221) and the second lead head (231) that are close together.
The traction motor according to claim 1 is characterized in that all the ring bodies of the same conductive ring (1) include a U ring (11), a V ring (12), a W ring (13) and a neutral ring (14); all the ring bodies of the same conductive ring (1) are grouped in pairs and are arranged on two opposite sides of the first lead head (221) and the second lead head (231) which are placed side by side.
The traction motor according to claim 2 is characterized in that the first lead head (221) is offset relative to the central axis of the coil nose (21) in a direction away from the second lead head (231); two of the ring bodies of the same conductive ring (1) are adjacent to the first lead head (221) and are arranged axially along the coil nose (21), and the other two of the ring bodies are adjacent to the second lead head (231) and are arranged radially along the coil nose (21).
The traction motor according to claim 1 is characterized in that any of the stator leads further comprises a binding portion (3) for integrally binding the first lead head (221), the second lead head (231) and the conductive ring (1).
The traction motor according to any one of claims 1 to 4 is characterized in that it also includes a junction box (4); the stator lead includes a first lead segment and a second lead segment; the coil nose (21), the first lead head (221) and the second lead head (231) are all arranged on the first lead segment, and the second lead segment includes a copper busbar (232) connected to the junction box (4).
The traction motor according to claim 5 is characterized in that the copper busbar (232) is provided with at least two mounting holes (2321) and a first fastener penetrating the mounting holes (2321) and tightened to the junction box (4).
The traction motor according to claim 5 is characterized in that the junction box (4) is specifically a non-magnetic steel junction box with an L-shaped cavity; the copper busbar (232) is arranged at a corner of the L-shaped cavity and bent along the corner.
The traction motor according to claim 5 is characterized in that it also includes a cable (5) connected to the copper busbar (232); the junction box (4) includes clamping plates (41) distributed in pairs, pads (42) distributed in pairs and arranged between a pair of the clamping plates (41), a junction box bracket (44) arranged between a pair of the pads (42) and a second fastener (43) for locking the pair of the clamping plates (41); any of the clamping plates (41) is provided with an open groove (411) for the cable (5) to be laterally embedded, and the openings of the open grooves (411) of the pair of the clamping plates (41) are opposite to each other and both face the pads (42).
The traction motor according to claim 8 is characterized in that the open groove (411) is specifically a U-shaped groove; the second fastener (43) is a countersunk threaded member arranged between any one of the clamping plates (41) and the pad (42), and the countersunk threaded members arranged on the two clamping plates (41) are staggered.
The traction motor according to claim 8 is characterized in that it also includes a terminal (6) arranged between the copper busbar (232) and the cable (5); the terminal (6) is sleeved with the cable (5) and connected to the copper busbar (232); the terminal (6) has a step surface for snapping with the junction box (4); and the plurality of terminal blocks (6) arranged on the plurality of cables (5) are distributed opposite to each other in pairs.