WO2024051047A1

WO2024051047A1 - Motor stator structure and motor

Info

Publication number: WO2024051047A1
Application number: PCT/CN2022/143026
Authority: WO
Inventors: 鲍泉; 成艳琪; 唐赢武; 李广; 唐子谋; 钟博; 乔长帅; 随帅民; 黄勇; 罗定辉; 王成; 王宁; 王钊; 李科成; 刘雄建; 文思静; 王山; 张建安; 赵延召
Original assignee: 中车株洲电机有限公司
Priority date: 2022-09-09
Filing date: 2022-12-28
Publication date: 2024-03-14
Also published as: CN115664066A

Abstract

A motor stator structure, comprising a stator body, a stator pulling member provided on the radial outer side of the stator body, and two pressing rings respectively provided at two ends of the stator pulling member. A stator cooling channel is formed in the stator pulling member or at least one of the stator pulling members; and at least one pressing ring is provided with a gap in butt joint with the stator cooling channel, so that the stator cooling channel can be communicated with an inlet and outlet channel by means of the gap. The stator cooling channel is formed at the stator pulling member, so that the structure at the stator cooling channel can be cooled. The stator cooling channel is provided at the stator pulling member, and the stator structure does not need to be changed, so that the stator manufacturing is simpler and more convenient. Moreover, the stator cooling channel is provided more simply and conveniently. Therefore, the motor stator structure can effectively solve the problem of poor effect of a stator heat dissipation configuration mode. Further disclosed in the present invention is a motor comprising the motor stator structure.

Description

Motor stator structure and motor

This application claims priority to the Chinese patent application filed with the China Patent Office on September 9, 2022, with the application number 202211103323.4 and the invention name "Motor stator structure and motor", the entire content of which is incorporated into this application by reference.

Technical field

The present invention relates to the field of electric equipment, more specifically, to a motor stator structure, and to a motor including the above motor stator structure.

Background technique

At present, the commonly used cooling structure for traction motors with cooling fans to provide cooling air is to provide ventilation holes on the stator or rotor, plus air gap ventilation between the stator and rotor. The first case: the stator can operate normally without ventilation holes. The temperature of the stator body can definitely be lower under the influence of additional cooling air. The motor design has a large redundancy. Through optimization, the outer diameter of the stator can be set smaller. , can reduce the size of the motor and reduce the space occupied by the motor; in the second case, the stator body is provided with ventilation holes. In this case, although the stator can be cooled, the ventilation holes occupy part of the volume, and the air in this part of the ventilation holes Compared with the core material, the magnetic permeability is basically negligible. Therefore, after opening the ventilation holes, when the maximum magnetic flux of the motor is the same, the outer diameter of the stator body will inevitably increase, which will also increase the volume of the motor. Therefore, it is not good to directly provide ventilation holes on the stator punching sheets to dissipate heat from the stator.

CN113381562A discloses an external frame heat dissipation system. A ventilation slot is provided on the motor base. Under the action of the cooling fan, the cooling air passes through the ventilation slots and heat dissipation ribs of the base to take away the heat of the stator. Although this structure It can reduce the heat of the stator, but the outer base occupies a certain volume, and the base casing cannot be too thin, because the base has to constrain the laminated stator body and also supports the entire motor, which will inevitably greatly increase the overall size of the stator. The weight of the motor is not conducive to lightweight design, so ventilation slots are installed on the base to dissipate heat from the stator. This arrangement is not good.

To sum up, how to effectively solve the problem of poor stator heat dissipation setting is an urgent problem for those skilled in the art.

Contents of the invention

In view of this, the first purpose of the present invention is to provide a motor stator structure that can effectively solve the problem of poor stator heat dissipation arrangement. The second purpose of the present invention is to provide a motor stator structure including the above Electric motor with stator structure.

In order to achieve the above-mentioned first purpose, the present invention provides the following technical solutions:

A motor stator structure, including a stator main body, a stator pull plate disposed radially outside the stator body, and two pressing rings respectively disposed at both ends of the stator pull plate. One or more of the stator pull plates have at least A stator cooling channel is provided at one of the stator pull plates; at least one of the pressing rings is provided with a notch that is connected to the stator cooling channel so as to communicate with the inlet and outlet channels through the notch.

In the above motor stator structure, a stator cooling channel is formed at the stator pull plate, and a gap is provided on the pressing ring to connect to the stator cooling channel, so as to be connected to the inlet and outlet channel, so that cooling fluid can be continuously or intermittently introduced into the stator. In the stator cooling channel, heat can be absorbed at the stator cooling channel to cool down the structure at the stator cooling channel. And because the stator pull plate is arranged close to the radial periphery of the stator, it can absorb heat and cool the stator periphery, thereby achieving a cooling effect on the stator. Moreover, a stator cooling channel is provided at the stator pull plate. On the one hand, there is no need to open additional ventilation holes inside the stator punching piece, thus avoiding the problem of stator torque reduction caused by the existence of ventilation holes in the stator punching piece. On the one hand, it can avoid the use of a larger casing, making the overall structure more compact, effectively reducing the size of the motor and making it lighter in weight. Furthermore, the structure of the stator main body does not need to be changed, making the stator main body manufacturing simpler and more convenient. Moreover, as the stator pull plate serves as a pulling member, there is no need to place too many requirements on the structural form, so it will be simpler and more convenient to set up the stator cooling channel. Therefore, a stator cooling channel is provided on the stator pull plate to dissipate heat from the stator. This stator heat dissipation setting method is more effective. In summary, the motor stator structure can effectively solve the problem of poor stator heat dissipation setting.

Preferably, the inner side of the stator pull plate has a groove structure, and the combination of the groove structure and the stator body forms the stator cooling channel.

Preferably, the stator pull plate has an arcuate cross section.

Preferably, the two pressing rings at both ends of the stator pull plate each have the notch to respectively dock with the channel openings at both ends of the stator cooling channel.

Preferably, the distance between the radial edges of the notch is not less than the distance between the radial side walls of the stator cooling channel.

Preferably, the two ends of the stator pull plate are welded and fixed to the pressure rings at both ends, and the pressure rings at both ends are respectively in contact with the two ends of the stator body.

Preferably, a plurality of the stator pull plates are evenly arranged along the circumferential direction of the stator body, and the stator cooling channel is provided at each of the stator pull plates.

Preferably, along the circumferential direction of the stator body, the sum of the central angles corresponding to the circumferential widths of all the stator cooling channels is not less than 120 degrees.

Preferably, the stator pull plate is provided with a hole penetrating at least to one end, and the inner cavity of the hole is the stator cooling channel.

In order to achieve the above second purpose, the present invention also provides a motor, which includes any of the above motor stator structures, including a rotor structure, and an air gap cooling channel is formed between the rotor structure and the motor stator structure. The rotor structure is provided with rotor cooling channels. Since the above motor stator structure has the above technical effects, a motor with the motor stator structure should also have corresponding technical effects.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic axial cross-sectional structural diagram of a motor provided by an embodiment of the present invention;

Figure 2 is a schematic radial cross-sectional structural diagram of the motor provided by the embodiment of the present invention;

Figure 3 is a schematic side structural view of a stator pull plate provided by an embodiment of the present invention;

Figure 4 is a schematic diagram of the outer structure of the stator pull plate provided by the embodiment of the present invention;

Figure 5 is a schematic structural diagram of a pressing ring provided by an embodiment of the present invention.

The following are marked in the attached drawing:

Stator body 1, stator pull plate 2, pressure ring 3, rotor structure 4, end cover 5, stator cooling channel 6, gap 7, air gap cooling channel 8, rotor cooling channel 9, slot cavity structure 21.

Detailed ways

Embodiments of the present invention disclose a motor stator structure, which can effectively solve the problem of poor stator heat dissipation settings.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Please refer to Figures 1-5. Figure 1 is a schematic axial cross-sectional structural diagram of a motor provided by an embodiment of the present invention; Figure 2 is a schematic radial cross-sectional structural diagram of a motor provided by an embodiment of the present invention; Figure 3 is a schematic structural diagram of a motor provided by an embodiment of the present invention. Figure 4 is a schematic structural diagram of the outside of the stator pull plate provided by the embodiment of the present invention; Figure 5 is a schematic structural diagram of the pressing ring provided by the embodiment of the present invention.

In some specific embodiments, as shown in FIG. 3 , a motor stator structure is provided for use with the rotor structure 4 of the motor. The motor stator structure mainly includes: stator body 1, stator pull plate 2 and pressure ring 3. It can be a stator structure of a caseless traction motor.

The stator body 1 may be a stator core or a stator core with windings. The outside of the stator body 1 is generally a stator blade, and the stator blades may be stator punching sheets to surround the outside of the rotor structure 4 . For the specific structure of the stator body 1, reference can be made to the existing technology and will not be described again here. In some embodiments, the outer side of the stator body 1 may be a smooth arc surface or other structures.

The stator pull plate 2 is arranged radially outside the stator body 1, and two pressure rings 3 are respectively arranged at both ends of the stator pull plate 2. The two ends of the stator pull plate 2 are fixedly connected to the pressure rings 3 at both ends, such as Welding and/or screw connection, etc., of course, other connection methods can also be used. The two ends of the stator body 1 are in contact with the pressure rings 3 at both ends to withstand the extrusion force from the pressure rings 3 and remain in the current position, and the stator pull plate 2 functions to press the pressure rings 3 at both ends. The relative distance is limited to ensure that the pressing rings 3 at both ends form a squeezing force on the stator pull plate 2 inside.

One or more of the stator pull plates 2 or at least one of the stator pull plates 2 is provided with a stator cooling channel 6. It should be noted that the motor stator structure may have only one stator pull plate 2, such as a cylindrical shape, Semi-circular, flat type, etc., when there is only one stator pull plate 2, then the stator pull plate 2 will be provided with a stator cooling channel 6; when the motor stator structure has multiple stator pull plates 2, there are usually more The stator pull plates 2 are arranged sequentially along the circumferential direction of the stator body 1. Among the plurality of stator pull plates 2, it can be considered that at least one stator pull plate 2 is provided with the above-mentioned stator cooling channel 6. Of course, each stator pull plate can also be provided with the stator cooling channel 6. 2 are all provided with the stator cooling channel 6.

What needs to be explained is how the stator cooling channel 6 is formed at the stator pull plate 2: for example, a tank structure can be formed on the outside or inside of the stator pull plate 2, and the slot cavity of the tank structure serves as the stator cooling channel 6; or it can be The stator pull plate 2 is provided with a hole along the stator axial direction. The hole may be a through hole penetrating along the stator axial direction, or a blind hole extending along the stator axial direction. The cavity of the hole serves as the above-mentioned stator cooling channel 6.

The stator cooling channel 6 , specifically, may be a stator cooling air channel, for cooling air to flow through the channel to cool the channel wall forming the channel. Of course, the stator cooling channel 6 can also be used to flow other cooling fluids, and the cooling fluid can be a liquid that meets usage requirements.

Correspondingly, at least one pressure ring 3 is provided with a notch 7 that is connected with the stator cooling channel 6 to communicate with the inlet and outlet passages through the notch 7 so as to realize the stator cooling channel 6 and the ingress and egress through the notch 7 on the pressure ring 3 . Channel connectivity.

It should be noted that the inlet and outlet passages, such as the inlet and outlet air chambers, are used to enter the cooling fluid and to export the cooling fluid. The inlet and outlet channel here: can be one channel, which can be used to introduce cooling fluid and export cooling fluid in time periods; of course, it can also be two channels, that is, separately set inlet channels and outlet channels. Correspondingly, two notches 7 can be provided on one pressure ring 3 to respectively correspond to the inlet channel and the outlet channel, or the notches 7 of the pressure rings 3 at both ends can be connected to the inlet channel and the outlet channel respectively. Generally, the cavity between the pressure ring 3 and the end cover 5 on the corresponding side is used as an inlet and outlet channel, such as an air inlet and outlet cavity.

Of course, how to connect the stator cooling channel 6 with the inlet and outlet channel through the gap 7 so that the cooling fluid can be exported and introduced is not limited to the above method, but other methods can also be used.

In the above motor stator structure, a stator cooling channel 6 is formed at the stator pull plate 2, and a notch 7 is provided on the pressing ring 3 to dock the stator cooling channel 6, so as to be connected to the inlet and outlet channels, so as to enable continuous or intermittent cooling. The cooling fluid is introduced into the stator cooling channel 6 so that it can absorb heat in the stator cooling channel 6 and cool down the structure in the stator cooling channel 6 . In addition, because the stator pull plate 2 is disposed close to the radial periphery of the stator body 1, it can absorb heat and cool down the stator periphery, thereby achieving a cooling effect on the stator body 1. Moreover, the stator cooling channel 6 is provided at the stator pull plate 2 without changing the stator structure, making the stator manufacturing simpler and more convenient. Moreover, as the stator pull plate 2 serves as a pulling member, there is no need to place too many requirements on the structural form, so it is simpler and more convenient to set up the stator cooling channel 6 . To sum up, the motor stator structure can effectively solve the problem of poor stator heat dissipation setting.

In some embodiments, a slot structure 21 is provided on the inner side of the stator pull plate 2 , and the slot structure and the stator body 1 are combined to form a stator cooling channel 6 . This allows part of the cooling fluid in the stator cooling channel 6 to directly contact the stator body 1, so that heat can be absorbed at the stator body 1 more efficiently. Furthermore, the stator pull plate 2 is provided with a groove structure 21, which can be used as a main component of the stator cooling channel 6, thereby avoiding or reducing the problem of slotting in the stator body 1.

In some embodiments, in order to allow the cooling fluid in the slot cavity to contact the stator body 1 over a larger area, it is preferred that the slot cavity structure be flattened, that is, the slot depth of the slot cavity structure is smaller than the slot width of the slot cavity structure. And preferably, the groove depth of the groove structure is significantly smaller than the groove width of the groove structure, so that there is a larger span in the circumferential direction of the stator body 1, so that the stator body 1 can be cooled more efficiently. Specifically, it may be to control the central angle corresponding to the width of the stator cooling channel 6 in the circumferential direction. The central angle corresponding to the width of the stator cooling channel 6 in the circumferential direction is the angle between the two sides of the stator cooling channel 6 in the circumferential direction relative to the rotor axis. At this time, the arc segments on the stator body 1 have the same included angle, As the inner channel wall of the stator cooling channel 6, the larger the angle is, it means that more parts of the outer circumferential direction of the stator body can directly contact the cooling fluid in the stator cooling channel 6. Specifically, along the circumferential direction of the stator body 1, the sum of the central angles corresponding to the circumferential widths of all the stator cooling channels 6 is not less than 120 degrees to better ensure that the stator body 1 is in direct contact with the cooling fluid. area. Correspondingly, the radial width and circumferential width of the stator pull plate 2 can be comprehensively considered based on the actual cooling air volume required by the motor and the number of stator pull plates 2 .

In some embodiments, the above-mentioned groove structure 21 is provided on the inside of the stator pull plate 2, which can not only serve as the stator cooling channel 6, but also enable the stator pull plate 2 to enhance torsion resistance and reduce weight.

In some embodiments, for convenience of installation, the cross section of the stator pulling plate 2 may be arcuate. That is, both sides in the circumferential direction are bent toward the stator body 1 to form a slot structure. The specific stator pull plate 2 may include a flat plate portion located in the middle circumferentially and two bent plate portions on both sides of the flat plate portion to connect to form an arcuate structure.

In some embodiments, the pressure rings 3 at both ends can be provided with notches 7 , the notch 7 of the pressure ring 3 at the inlet end is connected to the inlet channel, and the notch 7 of the pressure ring 3 at the outlet end is connected to the outlet channel, so that the inlet The channel enters the stator cooling channel 6 through the notch 7 of the inlet pressure ring 3, and then absorbs heat from the stator cooling channel 6 and then flows out from the notch 7 of the outlet pressure ring 3 to the outlet channel.

In some embodiments, in order to make the fluid flow between the notch 7 and the stator cooling channel 6 smoother, the distance between the radial edges of the notch 7 can be made not narrower than the distance between the radial side walls of the stator cooling channel 6 Of course, the distance between the circumferential edges of the notch 7 can also be made not narrower than the distance between the circumferential side walls of the stator cooling channel 6 . Therefore, the fluid in the end face part of the stator cooling channel 6 , especially in the edge part, does not need to change direction and can directly flow into the gap 7 . Specifically, the notch 7 can be made slightly larger than the port of the stator cooling channel 6 to facilitate assembly. Of course, the ports of the notch 7 and the stator cooling channel 6 can also be equal in size and shape, and aligned and connected.

In some embodiments, as shown in FIGS. 3 and 5 , the width h of the notch 7 of the pressing ring 3 in the radial direction can be no less than the width h of the stator cooling channel 6 in the radial direction. And/or the width L1 of the notch 7 of the pressing ring 3 in the circumferential direction is not less than the width L of the stator cooling channel 6 in the circumferential direction.

In some embodiments, a plurality of stator pull plates 2 may be evenly arranged along the circumferential direction of the stator body 1 , and the stator cooling channel 6 may be provided on each stator pull plate 2 . For example, four stator pulling plates 2 may be provided with angles of 90 degrees to each other.

In some embodiments, a hole extending at least to one end may be provided in the stator pull plate 2 , and the inner cavity of the hole is the stator cooling channel 6 . Of course, the stator pull plate 2 can only be provided with the hole, or a slot structure can be formed inside the stator pull plate 2 , and both the slot structure and the hole form the above-mentioned stator cooling channel 6 .

In some embodiments, the stator cooling channel 6 is formed between the stator body 1 and the stator pull plate 2, which can avoid opening a cooling channel in the stator body 1, maximize the use of the stator body 1, and allow the motor to meet the requirements without increasing the size. High-power operation can be achieved under temperature rise requirements or the stator outer diameter can be reduced at the same power.

Based on the motor stator structure provided in the above embodiments, the present invention also provides a motor, which includes any one of the motor stator structures in the above embodiments, including a rotor structure 4. The rotor structure 4 and the motor can be further An air gap cooling channel 8 is formed between the stator structures of the motor, and a rotor cooling channel 9 may be further provided in the rotor structure 4 . Since the motor adopts the motor stator structure in the above embodiment, please refer to the above embodiment for the beneficial effects of the motor.

In some embodiments, the air gap cooling channel 8 and the rotor cooling channel 9 are both connected to the above-mentioned inlet and outlet channels. For example, an air inlet cavity may be formed between the pressure ring 3 at one end and the end cover 5 at the corresponding end, and the pressure ring 3 at the other end may form an air inlet cavity. An air outlet cavity is formed between the ring 3 and the end cover 5 at the corresponding end.

In some embodiments, the heat of the motor is taken away by the cooling air in the above three cooling channels to balance the temperature of the stator and rotor of the motor, avoid overheating of the stator, and extend the life of the motor insulation.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

A motor stator structure, including a stator main body, a stator pull plate disposed radially outside the stator body, and two pressing rings respectively disposed at both ends of the stator pull plate, characterized in that one of the stator pull plates or At least one of the plurality of stator pull plates is provided with a stator cooling channel; at least one of the pressing rings is provided with a gap that is connected to the stator cooling channel to communicate with the inlet and outlet channel through the gap.
The motor stator structure according to claim 1, wherein the stator pull plate has a groove structure inside, and the stator cooling channel is formed by combining the groove structure with the stator body.
The motor stator structure according to claim 2, wherein the stator pull plate has an arcuate cross section.
The motor stator structure according to claim 3, wherein the two pressing rings located at both ends of the stator pull plate each have the notch to connect with the channel openings at both ends of the stator cooling channel respectively.
The motor stator structure according to claim 4, wherein the distance between the radial edges of the notch is not less than the distance between the radial side walls of the stator cooling channel.
The motor stator structure according to claim 5, wherein the two ends of the stator pull plate are welded and fixed to the pressure rings at both ends, and the pressure rings at both ends offset the two ends of the stator body respectively. catch.
The motor stator structure according to claim 6, wherein a plurality of stator pull plates are evenly arranged along the circumferential direction of the stator body, and the stator cooling plate is provided at each stator pull plate. aisle.
The motor stator structure according to claim 7, characterized in that, along the circumferential direction of the stator body, the sum of the central angles corresponding to the circumferential widths of all the stator cooling channels is not less than 120 degrees.
The motor stator structure according to any one of claims 1 to 8, characterized in that the stator pull plate is provided with a hole penetrating at least to one end, and the inner cavity of the hole is the stator cooling channel.
A motor including a rotor structure, characterized in that it also includes a motor stator structure according to any one of claims 1 to 9, an air gap cooling channel is formed between the rotor structure and the motor stator structure, The rotor structure is provided with a rotor cooling channel.