Stator, electric motor, and preparation method for stator

Abstract

Provided in the embodiments of the present application are a stator, an electric motor, and a preparation method for a stator. The stator comprises a core and a winding, wherein the core comprises a yoke portion and a plurality of tooth portions, the cross section of the yoke portion is in the shape of a circular ring, and each tooth portion comprises a body portion and a bending portion, the body portion being connected to a side wall of the yoke portion, the bending portion being formed by bending and extending from the end of the body portion facing away from the yoke portion, a gap slot being formed between every two adjacent tooth portions, and the yoke portion, one tooth portion and one gap slot forming a winding slot; and the winding comprises a plurality of coils, at least part of each coil being arranged in the winding slot in the axial direction of the core. The stator, the electric motor, and the preparation method for a stator that are provided in the embodiments of the present application aim to improve the strength of connection between the winding and the core, the heat dissipation capacity of the winding, and the PDIV performance of the electric motor.

Description

Stator, motor and method for preparing stator 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 manufacturing a stator. Background Art

[0002] With the development of intelligent, networked and automated electric vehicles, consumers are accepting them more and more, and the market ownership continues to grow year by year. Vehicle energy mode and efficiency have become a difficult problem that must be solved in the new energy vehicle industry. In order to improve the charging efficiency of power batteries, the voltage platform has an obvious trend towards high voltage, and the operating voltage of the drive motor will be greatly increased.

[0003] The Partial Discharge Inception Voltage (PDIV) is the voltage at which half of the insulation gaps breakdown when multiple impulse voltages are applied. It is a key indicator for evaluating the insulation strength of motors. However, due to the size and performance limitations of the stators, the insulation structure of related motors cannot be directly applied to other high-voltage motors. As a result, in today's high-voltage platform, motors used in vehicles are difficult 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.

[0005] Summary of the Invention

[0006] 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.

[0007] In a 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 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, a gap slot is formed between adjacent teeth, and the yoke, a tooth and a gap slot 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.

[0008] 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.

[0009] According to an embodiment of the first aspect of the present application, the distance between the bent portion of a tooth and the main body portion of an adjacent tooth is D, and then 0.2 mm≦D≦2 mm.

[0010] According to an embodiment of the first aspect of the present application, 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.

[0011] 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.

[0012] According to an embodiment of the first aspect of the present application, the insulating member is provided so as to protrude from the iron core at both ends of the iron core in the axial direction.

[0013] According to an embodiment of the first aspect of the present application, in a winding slot, at least part of the plurality of coils are arranged sequentially along the radial direction, and two sides of the plurality of coils are respectively in contact with the yoke and the bent portion along the radial direction.

[0014] 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.

[0015] In a third aspect, an embodiment of the present application provides a method for preparing a stator, which is used to prepare the stator provided in any embodiment of the first aspect of the present application, comprising the following steps:

[0016] The oil channel is reserved and the oil channel forming tooling is set in the clearance groove;

[0017] Install the insulation parts, place the insulation parts in each winding slot, and make the insulation parts respectively abut the yoke part, the main body part, the bending part and the oil channel forming tooling;

[0018] Winding forming: insert multiple coils from one end of the insulating member along the axial direction and extend from the other end. After the multiple coils are installed, the multiple coils are subjected to a winding forming process;

[0019] 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.

[0020] 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.

[0021] 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 slot together form a winding slot, the wrapping performance of the winding slot used for winding the coil is better, and during the winding forming process of the coil, it can provide better support effect for multiple coils, thereby improving the winding efficiency; the gap slot can be used as the oil channel inside the motor, and by introducing grease into the gap slot, it is possible to immerse the entire winding coil in 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 slot, 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 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 having higher insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0023] FIG1 is a schematic diagram of the three-dimensional structure of a stator provided in an embodiment of the first aspect of the present application;

[0024] FIG2 is an enlarged view of part A of the stator shown in FIG1 ;

[0025] FIG3 is a schematic diagram of the three-dimensional structure of the stator core provided in the embodiment of the first aspect of the present application;

[0026] FIG4 is an enlarged view of part B of the stator shown in FIG3 ;

[0027] FIG5 is a schematic structural diagram of a single coil in a stator provided in an embodiment of the first aspect of the present application;

[0028] FIG6 is a cross-sectional view of a stator provided in an embodiment of the first aspect of the present application, taken along a direction perpendicular to the axial direction;

[0029] FIG7 is a schematic structural diagram of the stator shown in FIG6 after the winding is removed;

[0030] FIG8 is a schematic structural diagram of the stator shown in FIG7 with the insulating member removed.

[0031] 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

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. 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" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0034] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0036] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0037] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] Figure 1 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 is an enlarged view of part A of the stator shown in Figure 1; Figure 3 is a schematic diagram of the three-dimensional structure of the iron core in the stator provided in the embodiment of the first aspect of the present application; Figure 4 is an enlarged view of part B of the stator shown in Figure 3; Figure 5 is a schematic diagram of the structure of a single coil in the stator provided in the 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 is a schematic diagram of the structure of the stator shown in Figure 6 after removing the winding; Figure 8 is a schematic diagram of the structure of the stator shown in Figure 7 after removing the insulating parts.

[0039] As shown in Figures 1 to 8, 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, and the bent portion 122 is formed by bending and extending from the end of the main body 121 away from the yoke 11, and a gap slot 101 is formed between adjacent teeth 12, and 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.

[0040] The stator 100 is the 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.

[0041] 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 .

[0042] The iron core 10 includes a yoke 11 and multiple teeth 12, which means that in the forming process of the iron core 10, during the stamping process of a single silicon steel sheet, the silicon steel sheet can be stamped into a sheet structure having 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. 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.

[0043] The cross section of the yoke 11 is annular, which means that the yoke 11 extends along an annular trajectory; the cross section of the yoke 11 refers to a plane perpendicular to the stacking direction of the multiple silicon steel sheets.

[0044] The yoke 11 functions to limit the basic shape of the stator 100 and control the size of the stator 100 .

[0045] The multiple teeth 12 are also arranged in a circular path extending along the yoke 11. The multiple teeth 12 are spaced apart in sequence to form stator slots for accommodating the windings 20 between adjacent teeth 12. Generally speaking, the multiple teeth 12 can be arranged on the side of the yoke 11 corresponding to the rotor. After the windings 20 are placed on the teeth 12, the air gap between the windings 20 and the rotor is reduced, thereby improving the magnetic induction effect of the rotor.

[0046] For example, 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 around the outer wall side of the iron core 10, in which case, 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, in which case, multiple teeth 12 are arranged on the inner wall surface of the yoke 11.

[0047] 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. Correspondingly, 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. Correspondingly, 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.

[0048] 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 after the winding 20 is energized can pass better through the peripheral silicon steel sheets (yoke 11 and tooth 12), thereby ensuring the magnetic flux performance of the motor.

[0049] The tooth portion 12 includes a main body portion 121 and a bent portion 122 . This means that 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 during stamping of the silicon steel sheet.

[0050] The main body 121 is the primary structural component of the tooth portion 12, supporting the winding 20 and forming a stable structure together with the winding 20. The main body 121 is connected to the side wall of the yoke 11. This means that the main body 121 and the yoke 11 are integrally formed during the stamping process of the silicon steel sheet, and one end of the main body 121 is connected to the side wall of the yoke 11.

[0051] For example, in an embodiment where the motor has an outer rotor structure, one end of the main body 121 can be connected to the outer wall surface of the yoke 11; in an embodiment where the motor has an inner rotor structure, one end of the main body 121 can be connected to the inner wall surface of the yoke 11.

[0052] 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 the circular trajectory extending from the yoke 11, so that the surfaces of 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.

[0053] It should be noted that in these embodiments of the present application, the bent portion 122 is the component closest to the rotor. By providing the bent portion 122, the effective magnetic flux area of ​​the tooth portion 12 can be effectively increased. That is, when the motor is operating, 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 bent 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 using the bent portion 122, the main body 121, and the yoke 11, which facilitates the subsequent processes of twisting, welding, and varnishing the winding 20, and can effectively improve the forming efficiency of the winding 20.

[0054] The gap grooves 101 are formed between adjacent teeth 12, which means that after the stator 100 is formed, gaps are left between adjacent teeth 12. In this way, the gap grooves 101 can serve as oil passages for the motor to allow grease to penetrate between the stator 100 and the rotor.

[0055] The yoke 11, a tooth portion 12, and a gap slot 101 form a winding slot 102. At least a portion of each coil 21 is disposed within the winding slot 102 along the axial direction of the core 10. This effectively connects one side of the winding slot 102 to the gap slot 101, allowing the grease within the gap slot 101 (which serves as an oil passage after the stator 100 is machined and formed) to fully contact the winding 20 within the winding slot 102. Under the action of oil pressure, air originally filling the periphery of the winding 20 is expelled, allowing every part of the winding 20 to be wetted by the grease. Because grease has a much higher breakdown resistance than air, it can reduce the possibility of breakdown of the winding 20 during operation, thereby improving the motor's PDIV value.

[0056] 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.

[0057] The winding 20 includes a plurality of coils 21. In a possible embodiment, the winding 20 is an integral component formed by winding, welding, and varnishing the plurality of coils 21. In these embodiments of the present application, the plurality of coils 21 can be directly formed into a shape similar to a "hairpin," i.e., 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 remains 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 extend from the other end of the winding slots 102. The straight portions extending from the winding slots 102 are then twisted, welded, and varnished to form the final winding 20.

[0058] The winding 20 is used to connect to an external power supply device to generate current in each coil 21 and further generate an electromagnetic field in the iron core 10 .

[0059] According to the stator 100 provided in the embodiment of the present application, the tooth portion 12 is provided to include a main body portion 121 and a bent portion 122, and the yoke portion 11, a tooth portion 12 and a gap slot 101 jointly form a winding slot 102, so that the wrapping performance of the winding slot 102 for winding the coil 21 is better, and during 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 as a whole in the grease, 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.

[0060] According to an embodiment of the first aspect of the present application, in each tooth portion 12 , the bent portion 122 bends and extends toward the same side of the main body portion 121 .

[0061] In these embodiments of the present application, the bent portion 122 of each tooth portion 12 bends and extends toward the same side of the main body portion 121, so that the entire iron core 10 forms a relatively uniform structure. When the motor is working, it is beneficial to uniformly distribute the magnetic flux in the iron core 10 and improve the stability of the magnetic induction between the stator 100 and the rotor.

[0062] At the same time, in these embodiments of the present application, by bending and extending the bent portion 122 to the same side of the main body 121, it is beneficial to arrange the gap slot 101 and the winding slot 102, that is, it is beneficial to arrange the gap slot 101 on one side of the winding slot 102. In this way, during 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.

[0063] 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.

[0064] According to the stator 100 provided in the embodiment of the present application, by arranging the bent portions 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 during operation is more uniform. At the same time, the bent portions 122 of each tooth portion 12 are 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 trajectory. 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 trajectory, 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.

[0065] 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 then 0.2 mm≦D≦2 mm.

[0066] In these embodiments of the present application, the distance between the bent portion 122 of one tooth 12 and the main portion 121 of the adjacent tooth 12 can be considered the width of the slot of the stator 100 pointing toward the rotor. In these embodiments of the present application, a larger slot width requires a corresponding reduction in the bent portion 122, that is, the cross-sectional area of ​​the tooth 12. This makes it more difficult for the magnetic field generated by the winding 20 to be evenly distributed across the tooth 12, thereby increasing the loss of magnetic conductivity of the silicon steel sheet.

[0067] Based on this, in these embodiments of the present application, by providing a bent portion 122 at the end of the main body 121 facing away from the yoke 11, it is equivalent to making a narrowing design for the slot of the stator 100 pointing to the rotor, thereby making more effective use of 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.

[0068] In these embodiments of the present application, the value of D can be set between 0.2 mm and 2 mm depending on the size of the motor. This allows the grease to penetrate between the stator 100 and the rotor through the slots, thereby maximizing the effective magnetic flux area of ​​the teeth 12 and increasing the magnetic field strength generated by the stator 100. 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, or 1.6 mm.

[0069] Accordingly, in these embodiments of the present application, the radial thickness of the bent portion 122 can be set to 2 mm to 4 mm, and the length of the bent portion 122 can be set to 4 mm to 8 mm. For example, in some embodiments, the radial thickness of the bent portion 122 can be set to 4 mm, and the length of the bent portion 122 can be set to 8 mm to maximize the cross-sectional area of ​​the bent portion 122 along the axial direction, allowing more magnetic flux lines to pass through the bent portion 122. At the same time, the magnetic flux lines can be concentrated more in the bent portion 122, that is, the portion close to the rotor, which is beneficial to improving the working performance of the motor.

[0070] 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 .

[0071] 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 teeth 12 of the stator 100 point to one side of the outer wall, and the rotor is arranged on the outer periphery of the stator 100.

[0072] 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.

[0073] 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 bent 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 increases 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.

[0074] According to an embodiment of the first aspect of the present application, the winding 20 further includes an insulating member 22 . The insulating member 22 is disposed in the winding slot 102 and is used to insulate the plurality of coils 21 from the iron core 10 .

[0075] The function of the insulating member 22 is to insulate the winding 20 from the iron core 10 .

[0076] The insulating member 22 is disposed within the winding slot 102. In a possible embodiment, the insulating member 22 is preformed and then inserted into the winding slot 102. In the embodiments of the present application, the insulating member 22 is typically a thin paper-like structure, and may be, but is not limited to, a polyester film composite material, a polyimide composite material, a silicone organic glass composite material, or the like.

[0077] The insulating member 22 itself has an extremely high PDIV value, and the electric field strength between the coils 21 is difficult to penetrate the insulating member 22, thereby enabling the insulating member 22 to provide excellent insulation protection for the windings 20 and the core 10. In these embodiments of the present application, the structural design of the gap slots 101 and the winding slots 102 allows grease to penetrate all parts of the coils 21, thereby reducing the possibility of the periphery of the coils 21 coming into contact with air, thereby reducing the probability of air penetration, improving the PDIV value of the motor, and improving reliability.

[0078] In some embodiments of the present application, the insulating member 22 is the slot insulation of the stator 100 .

[0079] It should be noted that, due to the relatively weak structural properties of the insulating member 22 itself (typically in the form of a thin paper sheet), it is difficult to withstand the impact forces applied by the winding 20 during the stator 100 molding process. Therefore, in these embodiments of the present application, by providing one end of the clearance slot 101 with a bent portion 122 spaced relative to the main body 121 of the other tooth portion 12, the installation and removal of the oil channel forming tooling can be facilitated. In this way, during the molding process of the stator 100, the oil channel forming tooling can be quickly inserted into the clearance slot 101 to seal the clearance slot 101, and after the winding 20 is formed, it can also be quickly withdrawn to form the oil channel.

[0080] According to an embodiment of the first aspect of the present application, the insulating member 22 is provided at both ends of the axial direction of the core 10 to protrude from the core 10 .

[0081] The insulating member 22 is arranged to protrude from the iron core 10 at both ends along the axial direction of the iron core 10, which means that the insulating member 22 can be pre-formed into a shape that matches the slot shape of the winding slot 102, and after the insulating member 22 is installed in the winding slot 102, the insulating member 22 is arranged to extend out of the winding slot 102 at both ends along the axial direction of the iron core 10. This arrangement is equivalent to arranging some redundant insulating members 22 at both ends of the winding slot 102, which can improve the insulation effect between the winding 20 and the iron core 10 after the winding 20 is formed.

[0082] 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 radial sides of the plurality of coils 21 respectively abut against the yoke 11 and the bent portion 122 .

[0083] At least a portion of the plurality of coils 21 is arranged radially in sequence, meaning that at least a portion of each coil 21 has a structure arranged radially in sequence. For example, in some embodiments of the present application, the coil 21 may include a pre-wound end 211 and a formed end 212 , which can be considered to be a straight conductor formed by bending. The bent end of the conductor serves as the pre-wound end 211 of the coil 21 , and the two axial ends of the conductor serve as the formed ends 212 .

[0084] Before forming the winding 20, 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 can be formed into a plurality of mutually parallel straight lines. The pre-wound coils 21 form a structure similar to a "hairpin." In this way, during the stator 100 forming process, the formed ends 212 of the pre-formed "hairpin" coils 21 can be inserted from one end of the winding slot 102 and extended from the other end. The formed ends 212 can then be twisted, welded, and varnished to form the final winding 20.

[0085] In these embodiments of the present application, the forming 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 (forming ends 212), the two forming 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 forming 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 forming 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 forming 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 the oil channel forming.

[0086] 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.

[0087] 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 penetrate the winding 20 over a large area, thereby effectively improving the PDIV value of the motor and improving reliability.

[0088] 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, comprising the following steps:

[0089] Step S1: Reserving the oil channel, placing the oil channel forming tool in the gap groove 101;

[0090] Step S2: Install the insulating member 22 . Place 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.

[0091] Step S3: forming the winding 20. Insert the plurality of coils 21 from one end of the insulating member 22 in the axial direction and extend them from the other end. After the plurality of coils 21 are installed, perform a winding forming process on the plurality of coils 21.

[0092] 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.

[0093] Among them, the process before step S1 is the forming process of the iron core 10. As described in the above embodiment, multiple silicon steel sheets can be stamped to form the above-mentioned 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.

[0094] 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 serve as the oil channel 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.

[0095] 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, the oil channel forming tooling and the gap groove 101 can also be set to transition fit. The above two fitting methods can be freely selected according to the model and size of the motor, and this application does not limit this.

[0096] Regarding the way in which the oil channel forming tooling is placed into the gap groove 101 , in some embodiments, the oil channel forming tooling can be placed into the gap between the bent portion 122 and the main body portion 121 of the other tooth portion 12 , or the oil channel forming tooling can be placed from both axial ends of the iron core 10 .

[0097] The insulating member 22 is disposed in each winding slot 102 . A possible implementation method is to insert the formed insulating member 22 into the winding slot 102 in an insertion manner.

[0098] Making the insulating part 22 respectively abut the yoke 11, the main body 121, the bent part 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 the yoke 11, the main body 121, the bent part 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.

[0099] In these embodiments of the present application, in the winding 20 forming process of step S3, 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.

[0100] In these embodiments, the winding forming process includes twisting, welding, and varnish dipping to achieve a stable connection between the winding 20 and the iron core 10 .

[0101] In step S4 , the oil channel forming tool is pulled out from the gap groove 101 , that is, 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 .

[0102] It should be noted that in these embodiments of the present application, after the winding 20 is formed, the clearance slots 101 may be blocked at both axial ends of the core 10, making it difficult to remove the tooling from the axial ends of the core 10. Therefore, by positioning the clearance slots 101 on one side of the winding slots 102 along the circular trajectory of the yoke 11, the tooling can be removed by utilizing the notch between the bent portion 122 and the main body 121 of the other tooth portion 12, thereby forming an oil channel for the flow of grease.

[0103] 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 11 .

[0104] Those 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 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.

[0105] The one or more embodiments of this application are intended to encompass all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this application should be included in the scope of protection of this 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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