Motor stator winding cooling structure and motor

Abstract

The utility model provides a motor stator winding cooling structure and a motor. The motor stator winding cooling structure of the utility model includes an insulating bushing arranged in the winding slot of the stator core, and a drainage structure arranged between the insulating bushing and the motor housing; the insulating bushing has an inner cavity that is set through the length direction of the winding slot, and the stator winding is passed through the inner cavity; the drainage structure can introduce the cooling oil in the oil supply circuit on the motor housing into the inner cavity, and the cooling oil flows through the inner cavity to reduce the temperature of the stator winding. The motor stator winding cooling structure of the utility model sets the inner cavity of the insulating bushing as a channel structure that is set through the length direction of the winding slot, and the cooling oil from the drainage structure can flow through to take away the heat emitted from the stator winding in the inner cavity, thereby well reducing the temperature of the stator winding, which is beneficial to improving the cooling effect of the stator winding of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, and in particular to a motor stator winding cooling structure. In addition, the utility model also relates to a motor. Background Art

[0002] With the rapid development of new energy vehicles, electric drive system assemblies are moving towards high power, high density, high speed and integration; in order to meet the design requirements of high-performance vehicles, the requirements for motor cooling systems are also becoming higher and higher.

[0003] During the operation of the motor, the stator winding will generate a lot of heat, which will lead to risks such as winding insulation failure and high-temperature demagnetization of the magnetic steel. Therefore, it needs to be cooled to ensure that it can work normally and perform at a higher performance. At present, the cooling of the motor stator is usually done by opening an oil channel on the outer ring of the stator core. The cooling oil flows through the oil channel to take away the heat of the core and is sprayed out to the oil spray rings at both ends for cooling, or an oil spray pipe is added to directly spray oil on the stator core and the end of the stator winding for cooling. Among them, the stator slots of the stator core are usually equipped with insulating bushings, and the stator winding is arranged in the insulating bushing to realize the installation of the stator winding on the stator core. At this time, the insulating bushing forms an isolation between the stator winding and the stator core to achieve insulation between the two.

[0004] During the operation of the motor, the ends and straight sections of the stator winding will generate a lot of heat, especially the straight sections in the winding slots where the temperature is the highest. In the prior art, the cooling effect on the ends of the stator windings is better by spraying oil through an oil spray pipe or opening oil channels in the stator core and then spraying oil, but it is impossible to directly cool the straight sections of the stator windings in the winding slots, resulting in a high temperature of the windings in the slots, affecting the performance of the motor. Moreover, the insulating bushing is usually made of pure paper or composite paper material, with a gap or transition fit with the stator core, and no axial positioning of the motor, which makes the stator winding and the insulating bushing prone to axial displacement, affecting the stiffness of the motor stator assembly and the NVH (Noise, Vibration, Harshness) performance of the motor. Utility Model Content

[0005] In view of this, the utility model aims to provide a motor stator winding cooling structure to improve the cooling effect of the motor stator winding.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A motor stator winding cooling structure comprises an insulating bushing arranged in a winding slot of a stator core, and a drainage structure arranged between the insulating bushing and a motor housing;

[0008] The insulating bushing has an inner cavity which is arranged through the length direction of the winding slot, and the stator winding is arranged in the inner cavity; the drainage structure can introduce the cooling oil in the oil supply circuit on the motor housing into the inner cavity, and the cooling oil flows through the inner cavity to reduce the temperature of the stator winding.

[0009] Furthermore, it also includes a bushing fixing plate arranged at one end of the stator core, and one end of the insulating bushing is fixed to the bushing fixing plate.

[0010] Furthermore, corresponding to the winding slot, a through hole is opened on the bushing fixing plate, the insulating bushing is inserted into the winding slot through the through hole, and the end of the insulating bushing is fixed at the through hole.

[0011] Furthermore, the end of the insulating bushing has an outwardly protruding fixing ear, and a fixing groove is formed on the bushing fixing plate next to the insertion hole, and the fixing groove is located on the side of the bushing fixing plate facing away from the winding groove; as the insulating bushing is inserted into place, the fixing ear is clamped and fixed in the fixing groove.

[0012] Furthermore, the bushing fixing plate is constructed in a circular ring shape, and a plurality of mounting holes are provided on the bushing fixing plate corresponding to each of the winding slots on the stator core, and the ends of each of the insulating bushings provided in each of the winding slots are respectively fixed at the corresponding mounting holes.

[0013] Furthermore, the drainage structure includes an oil inlet cover buckled on the bushing fixing plate, an oil storage cavity is formed between the oil inlet cover and the bushing fixing plate, and the oil inlet cover is provided with a cover oil inlet for connecting the oil supply circuit and the oil storage cavity; the oil storage cavity is connected to the inner cavity through the penetration hole.

[0014] Furthermore, the oil inlet cover and the bushing fixing plate are fixedly connected by means of a stopper.

[0015] Furthermore, a plurality of limiting bosses are arranged at intervals on the inner wall of the inner cavity, each of the limiting bosses separates a plurality of winding wire slots in the inner cavity, and each winding flat wire of the stator winding is respectively limited in each of the winding wire slots; the gaps between adjacent winding flat wires constitute a middle flow channel for the cooling oil to flow through.

[0016] Furthermore, the winding slots are evenly spaced in the radial direction of the stator core; grooves are formed on the inner wall adjacent to the winding flat wires arranged at the edge, and the grooves constitute edge flow channels for the cooling oil to flow through.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The motor stator winding cooling structure of the utility model arranges the inner cavity of the insulating bushing as a channel structure which is arranged through in the length direction of the winding slot, and the straight section of the stator winding located in the winding slot is arranged through the inner cavity, so that not only the insulating bushing can play an insulating role between the stator core and the stator winding, but also the inner cavity can allow cooling oil from the drainage structure to flow through to take away the heat dissipated from the stator winding in the inner cavity, thereby well reducing the temperature of the stator winding, which is beneficial to improving the cooling effect of the stator winding of the motor.

[0019] In addition, a bushing fixing plate is provided at one end of the stator core, and one end of the insulating bushing is fixed on the bushing fixing plate, so that the insulating bushing can be limited in the length direction of the winding slot (i.e., in the axial direction of the motor). A through hole is provided on the bushing fixing plate corresponding to each winding slot, so that the bushing fixing plate can be pre-installed and fixed to the end of the stator core, and then each insulating bushing can be installed through the through hole, which can make the entire assembly process more convenient and efficient.

[0020] Another object of the utility model is to provide a motor, on which the motor stator winding cooling structure of the utility model is provided. The motor of the utility model has the technical advantages possessed by the above-mentioned motor stator winding cooling structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention. The directional terms such as front and back, top and bottom involved therein are only used to indicate relative positional relationships and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the motor stator winding cooling structure according to an embodiment of the utility model after the oil inlet cover is hidden;

[0023] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the part indicated by AA (including the oil inlet cover);

[0024] Figure 3 It is a three-dimensional structural schematic diagram of the insulating bushing described in the embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the cross-sectional shape structure of the insulating bushing described in the embodiment of the utility model;

[0026] Figure 5 for Figure 4 The schematic diagram of the structure of the insulating bushing after the stator winding is installed;

[0027] Figure 6 It is a structural schematic diagram of the bushing fixing plate according to an embodiment of the utility model;

[0028] Figure 7 It is a front view of the bushing fixing plate according to the embodiment of the utility model;

[0029] Figure 8 It is a structural schematic diagram of the oil inlet cover described in an embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1. stator assembly; 10. stator core; 100. winding slot; 11. stator winding; 110. winding flat wire;

[0032] 2. Insulating bushing; 20. Inner cavity; 200. Position limiting boss; 201. Winding wire slot; 202. Middle flow channel; 203. Side flow channel; 21. Fixing ear;

[0033] 3. Bushing fixing plate; 30. Mounting hole; 300. Fixing groove;

[0034] 4. Oil inlet cover; 40. Oil storage cavity; 400. Oil inlet of cover. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0036] In the description of the present invention, it should be stated that if there are terms indicating directions or positional relationships such as "up, down, left, right, front, back, inside, outside", etc., they are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed or operate in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0037] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] Embodiment 1

[0040] This embodiment relates to a motor stator winding cooling structure, which can improve the cooling effect of the stator winding 11 of the motor; an exemplary structure thereof is as follows Figure 1 , Figure 2 and Figure 3 shown.

[0041] In general, the motor stator winding cooling structure includes an insulating bushing 2 disposed in a winding slot 100 of a stator core 10, and a drainage structure disposed between the insulating bushing 2 and the motor housing. The insulating bushing 2 has an inner cavity 20 that is arranged through the length direction of the winding slot 100, and the stator winding 11 is arranged in the inner cavity 20; the drainage structure can introduce the cooling oil in the oil supply path on the motor housing into the inner cavity 20, and the cooling oil flows through the inner cavity 20 to reduce the temperature of the stator winding 11.

[0042] It should be pointed out that, based on the above-mentioned overall design concept, the technical solution of the utility model can adopt a variety of different specific implementation structures, forms or configuration sequences. For example, the above-mentioned oil inlet cover drainage structure can adopt a variety of different specific structural forms such as a drainage pipe or a drainage channel arranged inside the stator core 10. For the parts required for the implementation of the overall solution but not involved in the above-mentioned overall setting, reasonable and flexible designs can be made with reference to the mature setting means in the field, the actual situation during implementation, etc. The specific implementation scheme described below in this embodiment is only a better one of the many schemes that can be formed by the above-mentioned various combinations and changes. In actual implementation, those skilled in the art can make flexible adjustments and improvements based on the actual situation. Obviously, the many schemes that can be formed by the above-mentioned various specific forms of combination and changes, as well as the specific implementation scheme of this embodiment, are all within the protection scope of the utility model.

[0043] Specifically, in this embodiment, combined with Figure 4 , Figure 5 As shown, a plurality of limiting bosses 200 are arranged at intervals on the inner wall of the inner cavity 20 of the insulating bushing 2, and each limiting boss 200 separates a plurality of winding wire slots 201 in the inner cavity 20, and each winding flat wire 110 of the stator winding 11 is respectively limited in each winding wire slot 201. In this way, the gaps between adjacent winding flat wires 110 constitute a middle flow channel 202 for cooling oil to flow through. Limiting bosses 200 are arranged on the inner wall of the inner cavity 20 of the insulating bushing 2, and winding wire slots 201 for limiting the winding flat wire 110 of the stator winding 11 can be formed between adjacent limiting bosses 200; thereby, the position of each winding flat wire 110 in the inner cavity 20 can be fixed, and gaps with fixed cross-sectional shapes can also be formed between each winding flat wire 110, and these gaps can constitute a middle flow channel 202 for cooling oil flowing through the inner cavity 20 to flow smoothly.

[0044] Based on the rationality of the arrangement of the winding flat wire 110 in the winding slot 100, in this embodiment, each winding wire slot 201 in the inner cavity 20 is evenly spaced in the radial direction of the stator core 10. Specifically, six limiting bosses 200 are arranged on the inner wall of the inner cavity 20, three of which are located on one side of the inner cavity 20, and the other three limiting bosses 200 are located on the other side of the inner cavity 20; the limiting bosses 200 on both sides are opposite to each other, separating four winding wire slots 201; the four layers of winding flat wire 110 are respectively inserted into these four winding wire slots 201; in the radial direction of the stator core 10, a groove is formed on the inner wall of the inner cavity 20 adjacent to the winding flat wire 110 located at the edge, and the groove constitutes a side flow channel 203 for cooling oil to flow through. In this way, the middle flow channel 202 and the side flow channel 203 constitute a total of five flow channels for cooling oil to flow through. Of course, for the stator winding 11 of the six-layer or eight-layer winding flat wire 110, the number of the limiting bosses 200 and the number of the separated winding wire slots 201 can be adjusted accordingly. A groove structure is provided on the inner wall of the inner cavity 20, and the groove can also form a side channel 203 for cooling oil to flow through. When the cooling oil flows through the middle channel 202 and the side channel 203, it can ensure that the cooling oil flows through both sides of the winding flat wire 110, thereby improving the cooling effect of the winding flat wire 110.

[0045] The stator assembly 1 of the motor includes the above-mentioned stator core 10 and the stator winding 11. The straight section of the stator winding 11 is arranged in the winding slot 100 on the stator core 10 through the above-mentioned insulating bushing 2. With the stator core 10 as the installation basis, as shown in FIG. Figure 1 , Figure 2 Combined with Figure 6 , Figure 7 As shown, the motor stator winding cooling structure of this embodiment also includes a bushing fixing plate 3 arranged at one end of the stator core 10, and one end of the insulating bushing 2 is fixed on the bushing fixing plate 3. The bushing fixing plate 3 is arranged at one end of the stator core 10, and one end of the insulating bushing 2 is fixed on the bushing fixing plate 3, so that the insulating bushing 2 can be limited in the length direction of the winding slot 100 (i.e., in the axial direction of the motor); obviously, in the cross section of the insulating bushing 2, the shape of the insulating bushing 2 will be set according to the cross-sectional shape of the winding slot 100, so in the direction outside the axial direction of the motor, the insulating bushing 2 has been reliably limited; through the setting of the bushing fixing plate 3, the insulating bushing 2 can be prevented from shifting in the axial direction of the motor, thereby fully ensuring the position stability of the insulating bushing 2.

[0046] Preferably, corresponding to the winding slot 100, a through hole 30 is opened on the bushing fixing plate 3, and the insulating bushing 2 is inserted into the winding slot 100 through the through hole 30, and the end of the insulating bushing 2 is fixed at the through hole 30. The through holes 30 are provided on the bushing fixing plate 3 corresponding to each winding slot 100, so that the bushing fixing plate 3 can be pre-installed and fixed to the end of the stator core 10, and then each insulating bushing 2 is inserted through the through hole 30, which can make the whole assembly process more convenient and efficient. The fixing effect of the insulating bushing 2 can be achieved by means of clamping, interference fit, welding, etc. between the through hole 30 and the end of the insulating bushing 2.

[0047] There are of course many options for fixing the insulating bushing 2 on the bushing fixing plate 3. In this embodiment, the end of the insulating bushing 2 has a fixing ear 21 that is convexly arranged, and a fixing groove 300 is formed on the bushing fixing plate 3 next to the insertion hole 30. The fixing groove 300 is located on the side of the bushing fixing plate 3 that is not facing the winding groove 100. As the insulating bushing 2 is inserted into place, the fixing ear 21 is clamped and fixed in the fixing groove 300. By providing the fixing groove 300 on the bushing fixing plate 3 next to the insertion hole 30, the clamping fit between the fixing ear 21 and the fixing groove 300 can be completed while the insulating bushing 2 is inserted, making the assembly and end fixing operations of the insulating bushing 2 more convenient and efficient.

[0048] Based on the shape characteristics of the end of the stator core 10, preferably, the bushing fixing plate 3 of this embodiment is constructed in a circular ring shape, and a plurality of insertion holes 30 are provided on the bushing fixing plate 3 corresponding to each winding slot 100 on the stator core 10, and the ends of each insulating bushing 2 provided in each winding slot 100 are respectively fixed at the corresponding insertion holes 30. The bushing fixing plate 3 is designed to be a circular ring shape suitable for the cross-sectional shape of the stator core 10, and a plurality of required insertion holes 30 can be opened corresponding to each winding slot 100 on the stator core 10 to cooperate with each insulating bushing 2. After the entire bushing fixing plate 3 is fixedly installed on the stator core 10, the insertion and fixing conditions of each insulating bushing 2 are met, so that the overall structure of the motor stator winding cooling structure is more concise and efficient, the internal space of the motor is optimized, and the assembly cost is reduced.

[0049] Based on the above-mentioned setting, the drainage structure of this embodiment is preferably set in the form of an oil inlet cover 4. Specifically, the drainage structure includes an oil inlet cover 4 buckled on the bushing fixing plate 3, and an oil storage cavity 40 is formed between the oil inlet cover 4 and the bushing fixing plate 3; and the oil inlet cover 4 is provided with a cover oil inlet port 400 for connecting the oil supply oil path and the oil storage cavity 40; the oil storage cavity 40 is connected to the inner cavity 20 through the through-hole 30. The drainage structure adopts the form of an oil inlet cover 4, and adopts the form of buckle cover assembly, so that the oil storage cavity 40 can be formed between the oil inlet cover 4 and the bushing fixing plate 3. The oil storage cavity 40 is connected to the inner cavity 20 of each corresponding insulating bushing 2 through each through-hole 30. After the cooling oil is introduced into the oil storage cavity 40 by means of the cover oil inlet port 400 on the oil inlet cover 4, the oil storage cavity 40 can play the role of buffering, liquid storage and diversion, which makes the entire flow path of the cooling oil more reasonable and effective.

[0050] In addition, the oil inlet cover 4 and the bushing fixing plate 3 of this embodiment are fixedly connected by means of a stopper. The stopper is a structure used for centering and connection, and can achieve connection and sealing by means of the close fit between the cylinder (corresponding to the bushing fixing plate 3 of this embodiment) and the hole (corresponding to the oil inlet cover 4 of this embodiment) and the close fit between the two end faces. Here, the outer peripheral surface of the bushing fixing plate 3 constitutes a convex stopper, and the end of the oil inlet cover 4 constitutes a concave stopper. With the cooperation of the two, the connection and fixation between the oil inlet cover 4 and the bushing fixing plate 3, as well as the formation of the oil storage cavity 40, can be conveniently achieved.

[0051] To sum up, the motor stator winding cooling structure of the present embodiment sets the inner cavity 20 of the insulating bushing 2 as a channel structure which is set through the length direction of the winding slot 100, and the straight section of the stator winding 11 located in the winding slot 100 is passed through the inner cavity 20. Not only can the insulating bushing 2 play an insulating role between the stator core 10 and the stator winding 11, but the inner cavity 20 can also allow cooling oil from the drainage structure to flow through to take away the heat dissipated from the stator winding 11 in the inner cavity 20, thereby effectively reducing the temperature of the stator winding 11, which is beneficial to improving the cooling effect of the stator winding 11 of the motor.

[0052] Embodiment 2

[0053] This embodiment relates to a motor, on which the motor stator winding cooling structure provided in the first embodiment is provided.

[0054] The cooling oil circuit scheme provided by the motor stator winding cooling structure of the utility model passes through the middle flow channel 202 and the side flow channel 203 located between the winding flat wires 110 in the inner cavity 20 of the insulating bushing 2, and the cooling oil flows from one end of the insulating bushing 2 through the inner cavity 20 to the other end, and directly contacts each winding flat wire 110 of the stator winding 11 to take away heat for cooling, effectively reducing the temperature of the stator winding 11 in the winding slot 100, with high cooling efficiency, which is conducive to ensuring the normal operation and performance improvement of the motor. The cooling oil flows through the inner cavity 20 and is sprayed out to the other end, and the stator winding 11 at the output end of the stator core 10 can also be sprayed with oil for cooling; the entire oil circuit scheme realizes the cooling of the end of the stator winding 11 and the straight section in the slot, with high cooling efficiency, which greatly reduces the temperature rise of the motor. At the same time, the fixing structure between the insulating bushing 2 and the bushing fixing plate 3 forms a positioning for the insulating bushing 2 and a limit for the stator winding 11 in the axial direction of the motor, thereby improving the assembly efficiency and facilitating the improvement of the NVH performance of the motor.

[0055] The above is only a preferred embodiment of the present invention. The detailed explanation of the configuration, the examples of the specific structural setting, or the description of the assembly connection method, etc., are all for the purpose of full disclosure so that those skilled in the art can better implement the present invention, and are not intended to limit the scope of protection of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A motor stator winding cooling structure, characterized in that: It comprises an insulating bushing (2) arranged in a winding slot (100) of a stator core (10), and a drainage structure arranged between the insulating bushing (2) and a motor housing; The insulating bushing (2) has an inner cavity (20) which is arranged to penetrate in the length direction of the winding slot (100), and the stator winding (11) is arranged in the inner cavity (20); The drainage structure can guide the cooling oil in the oil supply passage on the motor housing into the inner cavity (20), and the cooling oil flows through the inner cavity (20) to reduce the temperature of the stator winding (11).

2. The motor stator winding cooling structure according to claim 1, characterized in that: It also includes a bushing fixing plate (3) arranged at one end of the stator core (10), and one end of the insulating bushing (2) is fixed on the bushing fixing plate (3).

3. The motor stator winding cooling structure according to claim 2, characterized in that: Corresponding to the winding slot (100), a through hole (30) is opened on the bushing fixing plate (3), the insulating bushing (2) is inserted into the winding slot (100) through the through hole (30), and the end of the insulating bushing (2) is fixed at the through hole (30).

4. The motor stator winding cooling structure according to claim 3, characterized in that: The end of the insulating bushing (2) has an outwardly protruding fixing ear (21), and a fixing groove (300) is formed on the bushing fixing plate (3) next to the insertion hole (30), and the fixing groove (300) is located on the side of the bushing fixing plate (3) facing away from the winding groove (100); when the insulating bushing (2) is inserted into place, the fixing ear (21) is clamped and fixed in the fixing groove (300).

5. The motor stator winding cooling structure according to claim 3, characterized in that: The bushing fixing plate (3) is constructed in a circular ring shape. Corresponding to each of the winding slots (100) on the stator core (10), a plurality of penetration holes (30) are provided on the bushing fixing plate (3), and the ends of each of the insulating bushings (2) provided in each of the winding slots (100) are respectively fixed at the corresponding penetration holes (30).

6. The motor stator winding cooling structure according to claim 3, characterized in that: The drainage structure comprises an oil inlet cover (4) buckled on the bushing fixing plate (3), an oil storage cavity (40) is formed between the oil inlet cover (4) and the bushing fixing plate (3), and the oil inlet cover (4) is provided with a cover oil inlet port (400) for connecting the oil supply path and the oil storage cavity (40); the oil storage cavity (40) is connected to the inner cavity (20) via the through hole (30).

7. The motor stator winding cooling structure according to claim 6, characterized in that: The oil inlet cover (4) and the bushing fixing plate (3) are fixedly connected by means of stopper fitting.

8. The motor stator winding cooling structure according to any one of claims 1 to 7, characterized in that: A plurality of limiting bosses (200) are arranged at intervals on the inner wall of the inner cavity (20), each of the limiting bosses (200) separates a plurality of winding wire slots (201) in the inner cavity (20), and each of the winding flat wires (110) of the stator winding (11) is respectively limited in each of the winding wire slots (201); and the gaps between adjacent winding flat wires (110) constitute a middle flow channel (202) for the cooling oil to flow through.

9. The motor stator winding cooling structure according to claim 8, characterized in that: The winding wire slots (201) are evenly spaced in the radial direction of the stator core (10); a groove is formed on the inner wall adjacent to the winding flat wire (110) arranged at the edge, and the groove constitutes an edge flow channel (203) for the cooling oil to flow through.

10. A motor, characterized in that: The motor is provided with a motor stator winding cooling structure according to any one of claims 1 to 9.

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