Stator, motor and preparation method of stator

Abstract

The embodiment of the invention provides a stator, a motor and a preparation method of the stator, the stator comprises an iron core and a winding, the iron core comprises a yoke part and a plurality of tooth parts, the cross section of the yoke part is in a circular ring shape, each tooth part comprises a body part and a bending part, the body part is connected with the side wall of the yoke part, the bending part is formed by bending and extending from the end part, deviating from the yoke part, of the body part, a gap groove is formed between every two adjacent tooth parts, and the yoke part, one tooth part and one gap groove form a winding groove; the winding comprises a plurality of coils, and at least part of each coil is arranged in the winding groove in the axial direction of the iron core. According to the stator, the motor and the preparation method of the stator provided by the embodiment of the invention, the connection strength of the winding and the iron core, the heat dissipation capability of the winding and the PDIV performance of the motor are improved.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to a stator, a motor, and a method for preparing the stator. Background Art

[0002] With the development of intelligent, networked and automated electric vehicles, consumers are increasingly accepting them, and the market share continues to grow year by year. Vehicle energy methods and efficiency have become a difficult problem that the new energy vehicle industry must solve. In order to improve the charging efficiency of power batteries, the trend of high-voltage voltage platform is very obvious, and the operating voltage of the drive motor will be greatly increased.

[0003] The Partial Discharge Inception Voltage (PDIV) refers to the voltage at which half of the impulse voltages applied to the insulation gap cause breakdown, which is an important indicator for judging the insulation capacity of the motor. However, due to the size and performance limitations of the stator, it is difficult to directly apply the insulation structure of other high-voltage motors to the motors of related technologies. As a result, in today's high-voltage platform, it is difficult for motors used in vehicles to adapt to the high-voltage battery replacement environment.

[0004] Therefore, how to improve the PDIV performance of small-volume motors has become an urgent problem to be solved in the industry. Summary of the invention

[0005] The technical problem to be solved by the present application is to provide a stator, a motor and a method for preparing the stator with higher structural strength, better heat dissipation performance and significantly improved PDIV performance.

[0006] In the first aspect, an embodiment of the present application provides a stator, comprising an iron core and a winding, wherein the iron core comprises a yoke and a plurality of teeth, the cross-section of the yoke is annular, the tooth comprises a main body and a bent portion, the main body is connected to the side wall of the yoke, the bent portion is formed by bending and extending from the end of the main body away from the yoke, a gap groove is formed between adjacent teeth, and the yoke, a tooth and a gap groove form a winding slot; the winding comprises a plurality of coils, and at least a portion of each coil is arranged in the winding slot along the axial direction of the iron core.

[0007] According to an embodiment of the first aspect of the present application, in each tooth portion, the bent portion bends and extends toward the same side of the main body portion.

[0008] According to an embodiment of the first aspect of the present application, the distance between the bent portion of one tooth and the main body portion of an adjacent tooth is D, and then 0.2 mm≦D≦2 mm.

[0009] According to an embodiment of the first aspect of the present application, the main body is connected to an outer wall surface of the yoke; or, the main body is connected to an inner wall surface of the yoke.

[0010] According to an embodiment of the first aspect of the present application, the winding further includes an insulating member, which is disposed in the winding slot and is used to insulate the multiple coils from the iron core.

[0011] According to an embodiment of the first aspect of the present application, the insulating member is arranged to protrude from the iron core at both ends of the axial direction of the iron core.

[0012] According to an embodiment of the first aspect of the present application, in a winding slot, at least a portion of the plurality of coils are arranged in sequence along the radial direction, and two sides of the plurality of coils along the radial direction are respectively in contact with the yoke and the bent portion.

[0013] In a second aspect, an embodiment of the present application provides a motor, comprising a rotor and a stator as provided in any embodiment of the first aspect of the present application.

[0014] In a third aspect, an embodiment of the present application provides a method for preparing a stator, which is used to prepare a stator provided by any embodiment of the first aspect of the present application, comprising the following steps:

[0015] The oil channel is reserved, and the oil channel forming tooling is set in the gap groove;

[0016] Installing the insulating parts, placing the insulating parts in each winding slot, so that the insulating parts respectively abut against the yoke part, the main body part, the bending part and the oil channel forming tooling;

[0017] Winding forming, inserting a plurality of coils from one end of the insulating member along the axial direction and extending them from the other end, and after the plurality of coils are installed, performing a winding forming process on the plurality of coils;

[0018] Oil channel forming, after the winding is formed, the oil channel forming tool is pulled out from the gap groove to form an oil channel for filling oil.

[0019] According to an embodiment of the third aspect of the present application, in the oil channel forming step, the oil channel forming tool is pulled out in the radial direction of the yoke.

[0020] The beneficial effect of the present application is that, by setting the tooth portion including the main body portion and the bending portion, and the yoke portion, a tooth portion and a gap groove jointly form a winding groove, the wrapping performance of the winding groove used for winding the coil is better, and in the winding forming process of the coil, it can provide better support effect for multiple coils, thereby improving the winding efficiency; the gap groove can be used as the oil channel inside the motor, and by introducing grease into the gap groove, it is possible to immerse the entire coil of the winding in the grease, so that the grease can be used to take away the heat generated by the winding during operation, and the heat dissipation performance is better; at the same time, after the grease is introduced into the gap groove, the oil pressure of the grease can be used to discharge the air around the coil. Since the breakdown performance of the grease is much higher than that of the air, it can effectively suppress the breakdown effect of the strong and weak electric fields of different coils, thereby improving the PDIV value of the motor and improving the insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the stator provided in the embodiment of the first aspect of the present application;

[0023] Figure 2 yes Figure 1 An enlarged view of part A of the stator is shown;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the iron core in the stator provided by the embodiment of the first aspect of the present application;

[0025] Figure 4 yes Figure 3 An enlarged view of part B of the stator is shown;

[0026] Figure 5 It is a schematic diagram of the structure of a single coil in a stator provided in an embodiment of the first aspect of the present application;

[0027] Figure 6 is a cross-sectional view of the stator provided in the embodiment of the first aspect of the present application along a direction perpendicular to the axial direction;

[0028] Figure 7 yes Figure 6 The schematic diagram of the structure of the stator after removing the winding is shown;

[0029] Figure 8 yes Figure 7 The schematic diagram of the structure of the stator after removing the insulating parts is shown.

[0030] In the figure, 100, stator; 10, iron core; 11, yoke; 12, tooth; 121, main body; 122, bending part; 20, winding; 21, coil; 211, pre-wound end; 212, formed end; 22, insulating part; 101, gap slot; 102, winding slot. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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.

[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0033] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0036] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0037] Figure 1 It is a schematic diagram of the three-dimensional structure of the stator provided in the embodiment of the first aspect of the present application; Figure 2 yes Figure 1 An enlarged view of part A of the stator is shown; Figure 3 It is a schematic diagram of the three-dimensional structure of the iron core in the stator provided by the embodiment of the first aspect of the present application; Figure 4 yes Figure 3 An enlarged view of part B of the stator is shown; Figure 5 It is a schematic diagram of the structure of a single coil in a stator provided in an embodiment of the first aspect of the present application; Figure 6 is a cross-sectional view of the stator provided in the embodiment of the first aspect of the present application along a direction perpendicular to the axial direction; Figure 7 yes Figure 6 The schematic diagram of the structure of the stator after removing the winding is shown; Figure 8 yes Figure 7 The schematic diagram of the structure of the stator after removing the insulating parts is shown.

[0038] like Figures 1 to 8 As shown, an embodiment of the present application provides a stator 100, including an iron core 10 and a winding 20, wherein the iron core 10 includes a yoke 11 and a plurality of teeth 12, the cross section of the yoke 11 is annular, the tooth 12 includes a main body 121 and a bent portion 122, the main body 121 is connected to the side wall of the yoke 11, the bent portion 122 is formed by bending and extending from the end of the main body 121 away from the yoke 11, a gap slot 101 is formed between adjacent teeth 12, the yoke 11, a tooth 12 and a gap slot 101 form a winding slot 102; the winding 20 includes a plurality of coils 21, and at least a portion of each coil 21 is arranged in the winding slot 102 along the axial direction of the iron core 10.

[0039] The stator 100 is a part that remains stationary during the operation of the motor and is an important component of the motor. The main function of the stator 100 is to generate a rotating magnetic field so that the rotor moves under the action of the magnetic field force.

[0040] In these embodiments of the present application, the stator 100 may be formed by stacking silicon steel sheets to utilize the high magnetic permeability and low magnetic resistance of the silicon steel sheets to reduce energy loss during operation of the stator 100 .

[0041] The iron core 10 includes a yoke 11 and multiple teeth 12, which means that in the forming process of the iron core 10, in the stamping process of a single silicon steel sheet, the silicon steel sheet can be stamped into a sheet structure with a yoke 11 and multiple teeth 12, and then multiple stamped silicon steel sheets are stacked along the thickness direction to form the iron core 10, and the yokes 11 of the multiple silicon steel sheets together serve as the yoke 11 of the iron core 10, and the teeth 12 of the multiple silicon steel sheets together serve as the teeth 12 of the iron core 10.

[0042] The cross section of the yoke 11 is in a circular ring shape, which means that the yoke 11 extends along a circular ring track; the cross section of the yoke 11 refers to a plane perpendicular to the stacking direction of the plurality of silicon steel sheets.

[0043] The yoke 11 functions to limit the basic shape of the stator 100 and control the size of the stator 100 .

[0044] The arrangement of the plurality of teeth 12 is also a circular track extending along the yoke 11, and the plurality of teeth 12 are arranged in sequence and spaced apart to form a stator slot for placing the winding 20 between adjacent teeth 12. Generally speaking, the plurality of teeth 12 can be arranged on one side of the yoke 11 corresponding to the rotor, so that after the winding 20 is placed on the teeth 12, the air gap between the winding 20 and the rotor is reduced, thereby improving the magnetic induction effect of the rotor.

[0045] Exemplarily, in some embodiments, the motor provided in the embodiments of the present application can be an outer rotor structure, that is, the rotor is arranged on the outer wall side of the iron core 10, and in this case, the multiple teeth 12 are arranged on the outer wall surface of the yoke 11; in some embodiments, the motor can also be an inner rotor structure, that is, the rotor is arranged on the inner wall side of the iron core 10, and in this case, the multiple teeth 12 are arranged on the inner wall surface of the yoke 11.

[0046] It should be noted that the outer wall surface of the yoke 11 refers to the surface close to the outer side of the arc in the yoke 11 with an arc-shaped cross section when multiple silicon steel sheets are pressed and formed, and accordingly, the outer wall surface side of the iron core 10 also refers to the side close to the outer wall surface of the yoke 11; the inner wall surface of the yoke 11 refers to the surface close to the inner side of the arc in the yoke 11 with an arc-shaped cross section when multiple silicon steel sheets are pressed and formed, and accordingly, the inner wall surface side of the iron core 10 also refers to the side close to the inner wall surface of the yoke 11.

[0047] In these embodiments of the present application, the function of the stator slots is to place the winding 20, so that the magnetic flux lines generated by the winding 20 after power is supplied can pass better through the peripheral silicon steel sheets (yoke 11 and tooth 12), thereby ensuring the magnetic flux performance of the motor.

[0048] The tooth portion 12 includes a main body portion 121 and a bent portion 122 , which means that when the silicon steel sheets are stamped, the main body portion 121 and the bent portion 122 are formed on the portion of each silicon steel sheet corresponding to the tooth portion 12 .

[0049] The body 121 is the main structural part of the tooth part 12, and its function is to support the winding 20 to form a stable structure together with the winding 20. The body 121 is connected to the side wall of the yoke 11, which means that the body 121 and the yoke 11 are integrally formed during the stamping process of the silicon steel sheet, and one end of the body 121 is connected to the side wall of the yoke 11.

[0050] For example, in an embodiment where the motor has an outer rotor structure, one end of the main body 121 may be connected to the outer wall of the yoke 11; in an embodiment where the motor has an inner rotor structure, one end of the main body 121 may be connected to the inner wall of the yoke 11.

[0051] The bending portion 122 is formed by bending and extending from the end of the main body 121 away from the yoke 11. A possible implementation method is that the end of the main body 121 away from the yoke 11 is bent and extended along a circular trajectory extending from the yoke 11, so that the surfaces of the multiple bending portions 122 away from the yoke 11 also form a circular surface, which is beneficial to the setting of the rotor and reducing the air gap between the rotor and the stator 100, and has higher reliability.

[0052] It should be noted that in these embodiments of the present application, the bending portion 122 is the component closest to the rotor. By providing the bending portion 122, the effective area of ​​the magnetic flux of the tooth portion 12 can be effectively increased, that is, when the motor is working, more magnetic flux lines can pass through the tooth portion 12 to obtain lower magnetic resistance, thereby reducing energy loss. At the same time, the provision of the bending portion 122 can also provide a positioning process for the subsequent installation process of the winding 20, that is, the coil 21 placed in the winding slot 102 can be pre-positioned by using the bending portion 122, the main body 121 and the yoke 11, which is convenient for the subsequent processes of twisting, welding, and dipping the winding 20, and can effectively improve the forming efficiency of the winding 20.

[0053] The gap grooves 101 are formed between adjacent teeth 12, which means that after the stator 100 is formed, there are gaps between adjacent teeth 12. In this way, the gap grooves 101 can be used as oil passages of the motor to allow grease to infiltrate between the stator 100 and the rotor.

[0054] The yoke 11, a tooth 12 and a gap slot 101 form a winding slot 102, and at least part of each coil 21 is arranged in the winding slot 102 along the axial direction of the core 10. In this way, one side of the winding slot 102 is connected to the gap slot 101, so that the grease in the gap slot 101 (which is used as an oil passage after the stator 100 is processed and formed) can fully contact the winding 20 in the winding slot 102. Under the action of oil pressure, the air originally filled in the periphery of the winding 20 is discharged, so that each position of the winding 20 can be infiltrated by the grease. Since the breakdown performance of grease is much higher than that of air, the possibility of breakdown of the winding 20 during operation can be reduced, thereby improving the PDIV value of the motor.

[0055] At the same time, in these embodiments of the present application, since the grease can contact the winding 20 over a large area, the grease can be used to directly dissipate heat from the winding, resulting in better heat dissipation performance.

[0056] The winding 20 includes a plurality of coils 21. A possible implementation method is that the winding 20 is an integral component formed by winding, welding, varnishing, and other processes of the plurality of coils 21. In these embodiments of the present application, the plurality of coils 21 may be directly formed into a shape similar to a "hairpin", that is, a semi-finished structure of the winding 20 in which one end of the plurality of coils 21 is wound together and the other end is still in a straight line. When the winding 20 is formed, the straight ends of the plurality of coils 21 are inserted into the winding slots 102 and extended from the other end of the winding slots 102, and then the straight part extending from the winding slots 102 is twisted, welded, varnished, and other processes are performed to form the final winding 20.

[0057] The winding 20 is used to be connected to an external power supply device to form a current in each coil 21 and further form an electromagnetic field in the iron core 10 .

[0058] According to the stator 100 provided in the embodiment of the present application, by setting the tooth portion 12 to include a main body portion 121 and a bending portion 122, and the yoke portion 11, a tooth portion 12 and a gap slot 101 together form a winding slot 102, so that the wrapping performance of the winding slot 102 for winding the coil 21 is better, and in the winding forming process of the coil 21, it can provide a better support effect for multiple coils 21, thereby improving the winding efficiency; the gap slot 101 can be used as an oil channel inside the motor, and by introducing grease into the gap slot 101, it is possible to immerse the coil 21 of the winding 20 in the grease as a whole, so that the grease can be used to take away the heat generated by the winding 20 during operation, and the heat dissipation performance is better; at the same time, after the grease is introduced into the gap slot 101, the oil pressure of the grease can be used to discharge the air around the coil 21. Since the breakdown performance of the grease is much higher than that of the air, it can effectively suppress the breakdown effect of the strong and weak electric fields of different coils 21, thereby improving the PDIV value of the motor and having higher insulation performance.

[0059] According to an embodiment of the first aspect of the present application, in each tooth portion 12 , the bending portions 122 are bent and extended toward the same side of the main body portion 121 .

[0060] In these embodiments of the present application, the bending portion 122 of each tooth portion 12 bends and extends toward the same side of the main body portion 121 so that the entire core 10 forms a relatively uniform structure. When the motor is working, it is beneficial to evenly distribute the magnetic flux in the core 10 and enhance the stability of the magnetic induction between the stator 100 and the rotor.

[0061] At the same time, in these embodiments of the present application, by bending and extending the bending portion 122 to the same side of the main body portion 121, it is beneficial to set the gap slot 101 and the winding slot 102, that is, it is beneficial to set the gap slot 101 on one side of the winding slot 102. In this way, in the molding process of the stator 100, it is convenient to put the oil channel molding tool into or take out the gap slot 101, thereby improving the molding efficiency of the stator 100.

[0062] It should be noted that in these embodiments of the present application, since the gap groove 101 needs to be used as the oil channel after the stator 100 is formed, it is necessary to place an oil channel forming tool in the gap groove 101 before the winding 20 is placed to fill the space of the gap groove 101. In this way, in the subsequent steps of stator 100 forming (such as winding insertion, winding twisting, and paint dipping and shaping), the winding 20 is difficult to invade the gap groove 101 due to the blocking effect of the oil channel forming tool; at the same time, after the winding 20 is paint dipping and shaped, the oil channel forming tool is pulled out to vacate the position of the gap groove 101 to form an oil channel.

[0063] According to the stator 100 provided in the embodiment of the present application, by arranging the bent portion 122 in each tooth portion 12 on the same side of the main body portion 121, on the one hand, the magnetic flux passing through the iron core 10 when the motor is working can be homogenized, so that the magnetic field generated by the stator 100 when working is more uniform. At the same time, the bent portion 122 of each tooth portion 12 is bent and extended to the same side of the main body portion 121, so that each bent portion 122 is relatively spaced from the main body portion 121 of another tooth portion 12 in the direction of the circular track. The multiple tooth portions 12 jointly form a gap groove 101 and a winding groove 102 with the same shape and relative position, so that the gap groove 101 is located on one side of the winding groove 102 in the direction of the circular track, which is conducive to the insertion of the oil channel forming tooling into the gap groove 101, and is conducive to the extraction of the oil channel forming tooling after the winding 20 is formed, further improving the processing efficiency of the stator 100.

[0064] According to an embodiment of the first aspect of the present application, the distance between the bent portion 122 of one tooth portion 12 and the main body portion 121 of the adjacent tooth portion 12 is D, and 0.2 mm≦D≦2 mm.

[0065] In these embodiments of the present application, the distance between the bent portion 122 of a tooth portion 12 and the main body 121 of the adjacent tooth portion 12 can be regarded as the width of the slot of the stator 100 pointing to the rotor direction. In these embodiments of the present application, the larger the width of the slot, the smaller the cross-sectional area of ​​the bent portion 122, that is, the tooth portion 12, is required to be, so that the magnetic field generated by the winding 20 is more difficult to be evenly distributed in the tooth portion 12, increasing the loss of magnetic conductivity of the silicon steel sheet.

[0066] Based on this, in these embodiments of the present application, by providing a bending portion 122 at the end of the main body 121 that is away from the yoke portion 11, it is equivalent to making a shrinkage design for the slot of the stator 100 pointing to the rotor, thereby more fully utilizing the space of the tooth portion 12, increasing the effective magnetic flux area of ​​the tooth portion 12, reducing the loss of the magnetic field, and thereby improving the strength of the magnetic field of the stator 100.

[0067] In these embodiments of the present application, the value of D can be set between 0.2 mm and 2 mm according to the size of the motor, so as to increase the effective magnetic flux area of ​​the tooth portion 12 as much as possible and increase the magnetic field strength generated by the stator 100, provided that the grease can penetrate between the stator 100 and the rotor through the slot. In some embodiments, the value of D can be set to, but is not limited to, 0.5 mm, 0.8 mm, 1.2 mm, and 1.6 mm.

[0068] Accordingly, in these embodiments of the present application, the thickness of the bending portion 122 along the radial direction can be set to 2mm to 4mm, and at the same time, the length of the bending portion 122 extending can be set to 4mm to 8mm. For example, in some embodiments, the thickness of the bending portion 122 along the radial direction can be set to 4mm, and the length of the bending portion 122 extending can be set to 8mm, so as to maximize the cross-sectional area of ​​the bending portion 122 along the axial direction, so that more magnetic flux lines can pass through the bending portion 122, and at the same time, the magnetic flux lines can be gathered more in the bending portion 122, that is, the part close to the rotor, which is conducive to improving the working performance of the motor.

[0069] According to an embodiment of the first aspect of the present application, the main body 121 is connected to the outer wall surface of the yoke 11 ; or, the main body 121 is connected to the inner wall surface of the yoke 11 .

[0070] The main body 121 is connected to the outer wall of the yoke 11 , which means that when the motor is an outer rotor structure, the main body 121 is connected to the outer wall of the yoke 11 so that the tooth portion 12 of the stator 100 points to one side of the outer wall, and the rotor is arranged on the outer periphery of the stator 100 .

[0071] Correspondingly, the main body 121 is connected to the inner wall surface of the yoke 11, which means that when the motor is an inner rotor structure, the main body 121 is connected to the inner wall surface of the yoke 11 so that the tooth portion 12 of the stator 100 only faces one side of the inner wall surface, and the rotor is arranged on the inner side of the stator 100.

[0072] It should be noted that in these embodiments of the present application, whether it is an outer rotor structure or an inner rotor structure, a bending portion 122 can be provided in the tooth portion 12 at the end of the main body portion 121 facing away from the yoke portion 11. On the one hand, this improves the effective magnetic flux area of ​​the tooth portion 12, and on the other hand, it can also provide pre-positioning for the installation of the winding 20, thereby improving reliability.

[0073] According to an embodiment of the first aspect of the present application, the winding 20 further includes an insulating member 22 , which is disposed in the winding slot 102 and is used to insulate the plurality of coils 21 from the iron core 10 .

[0074] The function of the insulating member 22 is to insulate the winding 20 from the iron core 10 .

[0075] The insulating member 22 is disposed in the winding slot 102. A possible implementation is that the insulating member 22 is preformed and then inserted into the winding slot 102. In these embodiments of the present application, the insulating member 22 is generally a thin paper sheet structure, and may be, but is not limited to, a polyester film composite material, a polyimide composite material, a silicone organic glass composite material, and the like.

[0076] The insulating member 22 itself has a very high PDIV value, and the electric field strength between the coils 21 is difficult to break through the insulating member 22, so that the insulating member 22 can provide good insulation protection for the winding 20 and the iron core 10. In these embodiments of the present application, through the structural design of the gap slot 101 and the winding slot 102, the grease can infiltrate various positions of the coil 21 to reduce the possibility of the periphery of the coil 21 contacting the air, thereby reducing the probability of breaking through the air, improving the PDIV value of the motor, and improving reliability.

[0077] In some embodiments of the present application, the insulating member 22 is the slot insulation of the stator 100 .

[0078] It should be noted that, since the insulating member 22 itself has a relatively weak structural performance (usually in the shape of a thin paper sheet), it is difficult to withstand the impact force applied by the winding 20 during the molding process of the stator 100. Therefore, in these embodiments of the present application, by providing one end of the gap slot 101 with a relative spacing between the bent portion 122 and the main body portion 121 of the other tooth portion 12, the installation and removal of the oil channel molding tool can be facilitated. In this way, during the molding process of the stator 100, the oil channel molding tool can be quickly inserted into the gap slot 101 to block the gap slot 101, and after the winding 20 is formed, it can also be quickly pulled out to form an oil channel.

[0079] According to an embodiment of the first aspect of the present application, the insulating member 22 is disposed at both ends of the core 10 along the axial direction to protrude from the core 10 .

[0080] The insulating member 22 is arranged to protrude from the core 10 at both ends along the axial direction of the core 10, which means that the insulating member 22 can be pre-formed into a shape matching the groove type of the winding groove 102, and after the insulating member 22 is installed in the winding groove 102, the insulating member 22 is arranged to extend out of the winding groove 102 at both ends along the axial direction of the core 10. This arrangement is equivalent to arranging some redundant insulating members 22 at both ends of the winding groove 102, which can improve the insulation effect between the winding 20 and the core 10 after the winding 20 is formed.

[0081] According to an embodiment of the first aspect of the present application, in a winding slot 102 , a plurality of coils 21 are sequentially arranged in a radial direction, and two sides of the plurality of coils 21 in a radial direction are respectively in contact with the yoke 11 and the bent portion 122 .

[0082] At least part of the plurality of coils 21 is arranged in sequence along the radial direction, which means that in each coil 21, at least part of the structure is arranged in sequence along the radial direction. Exemplarily, in some embodiments of the present application, the coil 21 may include a pre-wound end 211 and a formed end 212, which may be regarded as a straight conductor formed by bending, wherein the bent end of the conductor is used as the pre-wound end 211 of the coil 21, and the two ends of the conductor along the axial direction are regarded as the aforementioned formed ends 212.

[0083] Before the winding 20 is formed, the pre-wound ends 211 of the multiple coils 21 can be pre-wound together, and the formed ends 212 of the multiple coils 21 form multiple parallel straight line structures, and the pre-wound multiple coils 21 form a structure similar to a "hairpin". In this way, during the forming process of the stator 100, the formed ends 212 of the multiple coils 21 in the shape of a "hairpin" after pre-forming can be inserted from one end of the winding slot 102 and extended from the other end of the winding slot 102, and then the formed ends 212 are twisted, welded, dipped in paint, etc. to form the final winding 20.

[0084] In these embodiments of the present application, the formed ends 212 of different coils 21 can be arranged in sequence along the radial direction in the winding slot 102, and in the multiple coils 21 (formed ends 212), the two formed ends 212 on both sides along the radial direction are respectively abutted against the yoke 11 and the bending portion 122, so that the multiple formed ends 212 can be pre-positioned by using the yoke 11 and the bending portion 122, and in the subsequent twisting, welding and paint dipping processes of the formed ends 212, the yoke 11, the main body 121, the bending portion 122 and the oil channel forming tooling can jointly provide positioning for the multiple formed ends 212, thereby improving the forming efficiency of the winding 20, and can greatly reduce the intrusion of the winding 20 into the gap slot 101 during forming, thereby improving the effect of oil channel forming.

[0085] An embodiment of the present application further provides a motor, comprising a rotor and a stator 100 as provided in any embodiment of the first aspect of the present application.

[0086] According to the motor provided in the embodiment of the present application, since the motor includes the stator 100 provided in any embodiment of the first aspect of the present application, the grease in the stator 100 of the motor can infiltrate the winding 20 over a large area, thereby effectively improving the PDIV value of the motor and improving reliability.

[0087] The embodiment of the present application provides a method for preparing a stator, which is used to prepare the stator 100 provided in any embodiment of the first aspect of the present application, and comprises the following steps:

[0088] Step S1, oil channel reservation, setting the oil channel forming tool in the gap groove 101;

[0089] Step S2, installing the insulating member 22, placing the insulating member 22 in each winding slot 102, so that the insulating member 22 abuts against the yoke 11, the main body 121, the bent portion 122 and the oil channel forming tooling;

[0090] Step S3, forming the winding 20, inserting the plurality of coils 21 from one end of the insulating member 22 along the axial direction and extending from the other end, and after the plurality of coils 21 are installed, performing a winding forming process on the plurality of coils 21;

[0091] Step S4, oil channel forming: after the winding 20 is formed, the oil channel forming tool is pulled out from the gap groove 101 to form an oil channel for filling oil.

[0092] Among them, before step S1 is the forming process of the iron core 10. As described in the aforementioned embodiment, multiple silicon steel sheets can be stamped to form the aforementioned yoke 11 and tooth portion 12 (main body portion 121 and bending portion 122) on each silicon steel sheet, and then the iron core 10 of the embodiment of the present application is formed by stacking multiple silicon steel sheets.

[0093] In these embodiments of the present application, the positions of the gap slots 101 and the winding slots 102 are set, on the one hand, to increase the contact area between the winding 20 and the gap slots 101. Since the gap slots 101 can be used as oil channels of the stator 100 after the stator 100 is formed, the winding 20 can be soaked in grease. On the one hand, the grease can be used to directly dissipate the heat from the winding 20, which has a higher heat dissipation efficiency. On the other hand, the grease can also be used to discharge the air around the winding 20, thereby improving the PDIV value of the motor and improving reliability.

[0094] In step S1, the oil channel forming tooling is set in the gap groove 101. A possible implementation method is that the size of the oil channel forming tooling matches the size of the gap groove 101. After the oil channel forming tooling is placed in the gap groove 101, the oil channel forming tooling and the gap groove 101 are interference fit to position the oil channel forming tooling in the gap groove 101; or, in some embodiments, a transition fit between the oil channel forming tooling and the gap groove 101 can also be set. The above two matching methods can be freely selected according to the model and size of the motor, and the present application does not limit this.

[0095] Regarding the method of placing the oil channel forming tool into the gap groove 101 , in some embodiments, the oil channel forming tool can be placed into the gap between the bending portion 122 and the main body portion 121 of the other tooth portion 12 , or the oil channel forming tool can be placed into the gap from both axial ends of the iron core 10 .

[0096] The insulating member 22 is disposed in each winding slot 102 . A possible implementation method is to insert the molded insulating member 22 into the winding slot 102 in an insertion manner.

[0097] Making the insulating part 22 respectively abut the yoke 11, the main body 121, the bent portion 122 and the oil channel forming tooling means that after the insulating part 22 is placed in the winding slot 102, in the cross section along the axial direction of the iron core 10, the insulating part 22 itself forms an annular structure that abuts against the yoke 11, the main body 121, the bent portion 122 and the oil channel forming tooling in four directions, so that in the subsequent winding 20 forming process, the formed end 212 of the coil 21 can be inserted into the annular structure to achieve the purpose of insulating the coil 21 from the iron core 10.

[0098] In these embodiments of the present application, in the winding 20 forming process of step S3, the multiple coils 21 can be directly formed into a "hairpin" shaped winding 20 semi-finished product, and then the multiple coils 21 can be further wound and formed by passing the formed ends 212 of each coil 21 through the winding slot 102 in sequence.

[0099] In these embodiments, the winding forming process includes twisting, welding and varnishing to achieve a stable connection between the winding 20 and the iron core 10 .

[0100] In step S4 , the oil channel forming tool is pulled out from the gap groove 101 , which means that the oil channel forming tool is pulled out from the gap between the bent portion 122 and the main body portion 121 of the other tooth portion 12 .

[0101] It should be noted that in these embodiments of the present application, after the winding 20 is formed, the gap groove 101 may be blocked at both ends of the axial direction of the core 10, making it difficult for the tool to be withdrawn from the two ends of the axial direction of the core 10. Therefore, the gap groove 101 is set on one side of the winding groove 102 along the circular track of the yoke 11, and the tool can be withdrawn by using the notch between the bent portion 122 and the main body 121 of the other tooth portion 12, thereby forming an oil passage for the flow of grease.

[0102] According to an embodiment of the third aspect of the present application, in the oil channel forming step, the oil channel forming tool is pulled out along the radial direction of the yoke 11 .

[0103] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0104] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A stator, characterized in that: include: The iron core comprises a yoke and a plurality of teeth, wherein the cross section of the yoke is annular, the teeth comprise a main body and a bent portion, the main body is connected to the side wall of the yoke, the bent portion is formed by bending and extending from the end of the main body away from the yoke, gap grooves are formed between adjacent teeth, and the yoke, one of the teeth and one of the gap grooves form a winding slot; The winding comprises a plurality of coils, at least a portion of each coil is arranged in the winding slot along the axial direction of the iron core.

2. The stator according to claim 1, characterized in that: In each of the tooth portions, the bent portions are bent and extended toward the same side of the main body portion.

3. The stator according to claim 2, characterized in that: The distance between the bent portion of one tooth and the main body of an adjacent tooth is D, and 0.2 mm≦D≦2 mm.

4. The stator according to claim 1, characterized in that: The main body is connected to the outer wall surface of the yoke; or, the main body is connected to the inner wall surface of the yoke.

5. The stator according to claim 1, characterized in that: The winding further includes an insulating member, which is disposed in the winding slot and is used to insulate the plurality of coils from the iron core.

6. The stator according to claim 5, characterized in that: The insulating member is disposed at two ends of the iron core along the axial direction and protrudes from the iron core.

7. The stator according to claim 1, characterized in that: In one of the winding slots, at least a portion of the plurality of coils are arranged in sequence along the radial direction, and two sides of the plurality of coils along the radial direction are respectively in contact with the yoke portion and the bent portion.

8. A motor, characterized in that: It comprises a rotor and a stator as claimed in any one of claims 1 to 7.

9. A method for preparing a stator, used for preparing the stator according to any one of claims 1 to 7, characterized in that: The steps include: The oil channel is reserved, and the oil channel forming tool is arranged in the gap groove; Installing the insulating member, placing the insulating member in each of the winding slots, so that the insulating member abuts against the yoke, the main body, the bending portion and the oil channel forming tooling respectively; Winding forming, inserting the plurality of coils from one end of the insulating member in the axial direction and extending them from the other end, and after the plurality of coils are installed, performing a winding forming process on the plurality of coils; Oil channel forming: after the winding is formed, the oil channel forming tool is pulled out from the gap groove to form an oil channel for filling oil.

10. The method for preparing a stator according to claim 9, characterized in that: In the oil channel forming step, the oil channel forming tool is pulled out in the radial direction of the yoke.

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