Electrical device, motor and stator thereof

Abstract

The present application provides an electric device, a motor and a stator thereof, wherein the stator of the motor comprises: a stator yoke; a plurality of stator teeth, arranged on a side of the stator yoke close to the rotor of the motor, and a stator slot is formed between two adjacent stator teeth; a stator winding, arranged on the plurality of stator teeth, comprising at least one first conductor and at least one second conductor, wherein the first conductor and the second conductor are inserted in the stator slot, and the first conductor is arranged away from the stator yoke relative to the second conductor; in the radial direction along the stator, the cross-sectional area of ​​the first conductor is smaller than the cross-sectional area of ​​the second conductor, wherein the thickness of the first conductor is smaller than the thickness of the second conductor, and / or the width of the first conductor is smaller than the width of the second conductor. By making the cross-sectional area of ​​the first conductor smaller than the cross-sectional area of ​​the second conductor, the cross-sectional area of ​​the first conductor can be reduced, the AC loss of the stator winding can be suppressed, and the efficiency of the motor can be improved.

Description

Technical Field

[0001] The present application relates to the field of power devices, and in particular to an electrical device, a motor and a stator thereof. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. With the development of the electric vehicle industry, the development of electric vehicle drive motors is also tending towards high voltage, high speed, integration, platformization and miniaturization.

[0003] The drive motor usually adopts a rectangular stator winding, and each winding in the stator winding has the same size. The drive motor includes a stator yoke and a plurality of stator teeth arranged on the stator yoke, and a stator slot is formed between two adjacent stator teeth. The area of ​​the stator teeth near the slot opening of the stator slot becomes narrower, and the magnetic resistance is large. The AC loss of the winding near the slot opening of the stator slot is large, which reduces the efficiency of the drive motor. Summary of the invention

[0004] The main technical problem solved by the present application is to provide an electrical device, a motor and a stator thereof, which can suppress AC loss and improve the efficiency of the motor.

[0005] In a first aspect, the present application provides a stator of a motor, comprising: a stator yoke; a plurality of stator teeth, arranged on a side of the stator yoke close to the rotor of the motor, with a stator slot formed between two adjacent stator teeth; a stator winding, arranged on the plurality of stator teeth, comprising at least one first conductor and at least one second conductor, the first conductor and the second conductor being inserted into the stator slot, and the first conductor being arranged away from the stator yoke relative to the second conductor; in a radial direction along the stator, a cross-sectional area of ​​the first conductor is smaller than a cross-sectional area of ​​the second conductor, wherein a thickness of the first conductor is smaller than a thickness of the second conductor, and / or a width of the first conductor is smaller than a width of the second conductor.

[0006] In the technical solution of the embodiment of the present application, the first conductor is arranged away from the stator yoke relative to the second conductor, that is, the first conductor is arranged close to the slot opening of the stator slot, and the cross-sectional area of ​​the first conductor is smaller than the cross-sectional area of ​​the second conductor, wherein the thickness of the first conductor is smaller than the thickness of the second conductor, and / or the width of the first conductor is smaller than the width of the second conductor; due to the large magnetic resistance of the slot opening of the stator slot, the AC loss of the first conductor close to the slot opening of the stator slot is large, and through the skin effect of the motor, it can be obtained that the AC loss of the first conductor is positively correlated with the cross-sectional area of ​​the first conductor. Therefore, by reducing the thickness of the first conductor or / and the width of the first conductor to achieve a reduction in the cross-sectional area of ​​the first conductor, the AC loss of the first conductor can be suppressed, and then the AC loss of the stator winding can be suppressed, thereby improving the efficiency of the motor.

[0007] In some embodiments, the first conductor has a thickness direction, and the first conductor is provided with at least one first groove along the thickness direction.

[0008] In the technical solution of the embodiment of the present application, the first conductor is provided with at least one first groove along the thickness direction to reduce the thickness of the first conductor so that the cross-sectional area of ​​the first conductor is smaller than the cross-sectional area of ​​the second conductor, which can suppress the AC loss of the stator winding and improve the efficiency of the motor.

[0009] In some embodiments, the thickness of the first conductor is between 1.25-1.5 mm; the thickness of the second conductor is between 1.35-1.56 mm.

[0010] In the technical solution of the embodiment of the present application, when the thickness of the first conductor is less than the thickness of the second conductor, the thickness of the first conductor is between 1.25-1.5 mm, and the thickness of the second conductor is between 1.35-1.56 mm, so as to be suitable for different types of motors and improve the application scenarios of the stator winding.

[0011] In some embodiments, the first conductor has a width direction, and the first conductor is provided with at least one second groove along the width direction.

[0012] In the technical solution of the embodiment of the present application, the first conductor is provided with at least one second groove along the width direction to reduce the width of the first conductor so that the cross-sectional area of ​​the first conductor is smaller than the cross-sectional area of ​​the second conductor, which can suppress the AC loss of the stator winding and improve the efficiency of the motor.

[0013] In some embodiments, the stator winding further includes at least one third conductor, wherein the third conductor is disposed close to the stator yoke relative to the second conductor, and a thickness of the third conductor is smaller than a thickness of the second conductor.

[0014] In the technical solution of the embodiment of the present application, the third conductor is arranged close to the stator yoke relative to the second conductor, that is, the third conductor is arranged at the bottom of the stator slot, and the thickness of the third conductor is less than the thickness of the second conductor. Reducing the thickness of the third conductor can save material of the third conductor and save space.

[0015] In some embodiments, the thickness of the third conductor is less than the thickness of the first conductor.

[0016] In the technical solution of the embodiment of the present application, the thickness of the third conductor is less than the thickness of the first conductor, that is, the thickness of the third conductor is the smallest, which can further save the material of the third conductor and save space.

[0017] In some embodiments, the thickness of the third conductor is between 1.2-1.32 mm.

[0018] In the technical solution of the embodiment of the present application, when the thickness of the third conductor is less than the thickness of the second conductor, the thickness of the third conductor is between 1.2-1.32 mm, so as to be suitable for different types of motors and improve the application scenarios of the stator winding.

[0019] In some embodiments, the stator winding further includes at least one fourth conductor, wherein the fourth conductor is located between the second conductor and the third conductor, and a thickness of the fourth conductor is greater than a thickness of the first conductor.

[0020] In the technical solution of the embodiment of the present application, the thickness of the fourth conductor is greater than the thickness of the first conductor, and the first conductor, the second conductor, the fourth conductor and the third conductor are connected in series. By increasing the thickness of the fourth conductor, the impedance of the fourth conductor is reduced, thereby reducing the impedance of the stator winding and suppressing the DC loss of the stator winding.

[0021] In some embodiments, the thickness of the fourth conductor is greater than the thickness of the second conductor.

[0022] In the technical solution of the embodiment of the present application, the thickness of the fourth conductor is greater than the thickness of the second conductor, which further increases the thickness of the fourth conductor, reduces the impedance of the fourth conductor, and further reduces the impedance of the stator winding, thereby suppressing the DC loss of the stator winding.

[0023] In some embodiments, the thickness of the fourth conductor is between 1.35 mm and 1.6 mm.

[0024] In the technical solution of the embodiment of the present application, when the thickness of the fourth conductor is greater than the thickness of the first conductor, the thickness of the fourth conductor is between 1.35-1.6 mm, so as to be suitable for different types of motors and improve the application scenarios of the stator winding.

[0025] In some embodiments, at least one third groove is disposed on a side wall of the stator tooth close to the fourth conductor.

[0026] In the technical solution of the embodiment of the present application, at least one third groove is provided on the side wall of the stator tooth close to the fourth conductor to increase the gap between the stator winding and the stator tooth, suppress AC loss, and improve the efficiency of the motor.

[0027] In some embodiments, a ratio of a width of the third groove to a thickness of the fourth conductor is between 0.8 and 1.2, and a depth of the third groove is between 0.2 and 0.6 mm.

[0028] In the technical solution of the embodiment of the present application, by setting the width and depth of the third groove, it is suitable for different stator teeth, and thus can be suitable for different types of motors, thereby improving the application scenarios of the stator winding.

[0029] In a second aspect, the present application provides a motor, comprising the above-mentioned stator.

[0030] In a third aspect, the present application provides an electrical device, comprising the above-mentioned motor.

[0031] It can be understood that the beneficial effects of the second to third aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here.

[0032] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a structural schematic diagram of an embodiment of an electric device provided by the present application;

[0035] Figure 2 is a cross-sectional schematic diagram of an embodiment of a motor provided by the present application;

[0036] Figure 3 yes Figure 2 An enlarged schematic diagram of region A in the middle motor;

[0037] Figure 4 yes Figure 2 A cross-sectional schematic diagram of another embodiment of the first conductor;

[0038] Figure 5 yes Figure 2 A cross-sectional schematic diagram of another embodiment of the first conductor;

[0039] Figure 6 yes Figure 2 A cross-sectional schematic diagram of yet another embodiment of the first conductor;

[0040] Figure 7 yes Figure 2 A cross-sectional schematic diagram of yet another embodiment of the first conductor;

[0041] Figure 8 yes Figure 2 A schematic diagram of an embodiment of a stator winding and a stator tooth;

[0042] Fig. 9 yes Figure 2 Schematic diagram of another embodiment of a stator winding and stator teeth.

[0043] The part numbers of the drawings in the specific implementation manner are as follows:

[0044] Vehicle 1000, battery device 100, controller 200, motor 300, stator 10, rotor 20, stator yoke 11, cooling holes 111, stator teeth 12, stator winding 13, first conductor 131, second conductor 132, thickness h1 of the first conductor, thickness h2 of the second conductor, width d1 of the first conductor, width d2 of the second conductor, first groove 133, second groove 134, third conductor 135, thickness h3 of the third conductor, fourth conductor 136, thickness h4 of the fourth conductor, third groove 137, stator slot 14, notch 141. DETAILED DESCRIPTION

[0045] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0047] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0048] Reference to "embodiments" herein 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 herein may be combined with other embodiments.

[0049] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0050] In the description of the embodiments of the present application, the term "multiple" 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).

[0051] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. With the development of the electric vehicle industry, the development of electric vehicle drive motors is also tending towards high voltage, high speed, integration, platformization and miniaturization.

[0054] The drive motor usually adopts a rectangular stator winding, and each winding in the stator winding has the same size. The drive motor includes a stator yoke and a plurality of stator teeth arranged on the stator yoke. A stator slot is formed between two adjacent stator teeth. The area of ​​the stator teeth close to the slot of the stator slot becomes narrower and has a large magnetic resistance. Based on the skin effect, the AC loss of the winding close to the slot of the stator slot is large, which reduces the efficiency of the drive motor. The skin effect is a physical phenomenon. When there is alternating current or alternating electromagnetic field in the conductor (or winding), the current distribution of the conductor (or winding) becomes uneven, and the current is mainly concentrated on the surface of the conductor (or winding), resulting in an increase in the impedance of the conductor (or winding), and then an increase in the AC loss.

[0055] Based on the above considerations, the present application provides an electrical device, a motor and a stator thereof, which can suppress AC loss and improve the efficiency of the motor. Wherein, the stator winding includes at least one first conductor and at least one second conductor, the first conductor and the second conductor are inserted into the stator slot, and the first conductor is arranged away from the stator yoke relative to the second conductor; in the radial direction along the stator, the cross-sectional area of ​​the first conductor is smaller than the cross-sectional area of ​​the second conductor. Wherein, the first conductor is arranged away from the stator yoke relative to the second conductor, that is, the first conductor is arranged close to the slot of the stator slot, and the cross-sectional area of ​​the first conductor is smaller than the cross-sectional area of ​​the second conductor; due to the large magnetic resistance of the slot of the stator slot, the AC loss of the first conductor close to the slot of the stator slot is large, and through the skin effect of the motor, it can be obtained that the AC loss of the first conductor is positively correlated with the cross-sectional area of ​​the first conductor, so by reducing the cross-sectional area of ​​the first conductor, the AC loss of the first conductor can be suppressed, and then the AC loss of the stator winding can be suppressed, and the efficiency of the motor can be improved. The AC loss of the first conductor is positively correlated with the cross-sectional area of ​​the first conductor, which means that the AC loss of the first conductor decreases as the cross-sectional area of ​​the first conductor decreases, and the AC loss of the first conductor increases as the cross-sectional area of ​​the first conductor increases.

[0056] The electric device, motor and stator thereof disclosed in the embodiments of the present application can be used in electric devices using a battery device as a power source or various energy storage systems using a battery device as an energy storage element. The electric device can be, but is not limited to, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, a robot, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, an electric car toy, an electric ship toy and an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0057] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0058] Please refer to Figure 1The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0059] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] In some embodiments, the battery device 100 may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0061] According to some embodiments of this application, see Figure 2 and Figure 3 As shown, Figure 2 is a cross-sectional schematic diagram of an embodiment of a motor provided in the present application, Figure 3 yes Figure 2 The motor 300 includes a stator 10 and a rotor 20. The stator 10 refers to the stationary part of the motor 300, and its function is to generate a rotating magnetic field; the rotor 20 refers to the rotating part of the motor 300, and its function is to realize the conversion of electrical energy and mechanical energy.

[0062] In some embodiments, the stator 10 has an accommodation space, and the rotor 20 is disposed in the accommodation space of the stator 10, so that the rotor 20 rotates in the accommodation space of the stator 10. In other embodiments, the rotor 20 has an accommodation space, and the stator 10 is disposed in the accommodation space of the rotor 20, and the rotor 20 rotates around the stator 10.

[0063] The stator 10 includes a stator yoke 11, a plurality of stator teeth 12 and a stator winding 13. When the motor 300 is working, the magnetic field passes through the stator teeth 12 from the stator yoke 11 and enters the rotor 20; or the magnetic field passes through the stator teeth 12 from the rotor 20 and enters the stator yoke 11.

[0064] The stator yoke 11 is arranged in an annular shape, that is, the stator yoke 11 surrounds the accommodating space of the stator 10. A plurality of stator teeth 12 are arranged on a side of the stator yoke 11 close to the rotor 20 of the motor 300. The side of the stator yoke 11 close to the rotor 20 refers to the inner side wall of the stator yoke 11 close to the rotor 20. For example, the inner side wall of the stator yoke 11 protrudes toward the rotor 20 to form a plurality of stator teeth 12.

[0065] A stator slot 14 is formed between two adjacent stator teeth 12 , and a notch 141 of the stator slot 14 is located on a side of the stator tooth 12 away from the stator yoke 11 .

[0066] In some embodiments, the stator slot 14 may be a parallel slot, and the two sides of the stator slot 14 are arranged in parallel, that is, the surfaces of the stator teeth 12 located on both sides of the stator slot 14 are arranged in parallel. Therefore, the width of the stator tooth 12 is narrower as it is closer to the slot opening 141, and the width of the stator tooth 12 is wider as it is closer to the stator yoke 11.

[0067] The stator winding 13 is disposed on a plurality of stator teeth 12, for example, the stator winding 13 is wound on a plurality of stator teeth 12. The stator winding 13 includes at least one first conductor 131 and at least one second conductor 132, the first conductor 131 and the second conductor 132 are inserted into the stator slot 14, and the first conductor 131 is disposed away from the stator yoke 11 relative to the second conductor 132.

[0068] The first conductor 131 is arranged away from the stator yoke 11 relative to the second conductor 132 , which means that the first conductor 131 is arranged on a side of the second conductor 132 away from the stator yoke 11 , that is, the first conductor 131 is arranged close to the slot 141 .

[0069] In some embodiments, the first conductor 131 and the second conductor 132 are connected in series, and the first conductor 131 and the second conductor 132 are parts of the stator winding 13 that play the role of electromagnetic pole energy conversion in the motor 300. The cross-section of the first conductor 131 and the cross-section of the second conductor 132 can be rectangular, that is, the first conductor 131 and the second conductor 132 are both flat wire conductors.

[0070] In the radial direction of the stator 10, the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132. The radial direction of the stator 10 refers to the diameter direction of the stator 10, for example, the diameter direction of the stator 10 is the diameter direction of the stator yoke 11. The cross-sectional area of ​​the first conductor 131 refers to the area of ​​the cross section of the first conductor 131, and the cross-sectional area of ​​the second conductor 132 refers to the area of ​​the cross section of the second conductor 132.

[0071] In this embodiment, the first conductor 131 is arranged away from the stator yoke 11 relative to the second conductor 132, that is, the first conductor 131 is arranged close to the notch 141 of the stator slot 14, and the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132. Since the magnetic resistance of the notch 141 of the stator slot 14 is large, the AC loss of the first conductor 131 close to the notch 141 of the stator slot 14 is large. Through the skin effect of the motor 300, it can be obtained that the AC loss of the first conductor 131 is positively correlated with the cross-sectional area of ​​the first conductor 131. Therefore, by reducing the cross-sectional area of ​​the first conductor 131, the AC loss of the first conductor 131 can be suppressed, and then the AC loss of the stator winding 13 can be suppressed, thereby improving the efficiency of the motor 300. Since the AC loss of the stator winding 13 is suppressed, the temperature unevenness of the stator winding 13 when the motor 300 is working can be reduced.

[0072] In some embodiments, the stator winding 13 includes multiple first conductors 131 and multiple second conductors 132, which are connected in series in sequence, and the multiple first conductors 131 have the same cross-sectional area, and the multiple second conductors 132 have the same cross-sectional area.

[0073] According to some embodiments of the present application, Figure 2 and Figure 3 As shown, the thickness h1 of the first conductor is smaller than the thickness h2 of the second conductor.

[0074] In some embodiments, the thickness h1 of the first conductor may refer to the distance of the first conductor 131 along the radial direction of the stator 10 , and the thickness h2 of the second conductor may refer to the distance of the second conductor 132 along the radial direction of the stator 10 .

[0075] When the width d1 of the first conductor and the width d2 of the second conductor remain unchanged, the thickness h1 of the first conductor is smaller than the thickness h2 of the second conductor, so that the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132. For example, when the width d1 of the first conductor and the width d2 of the second conductor are equal, and the thickness h1 of the first conductor is smaller than the thickness h2 of the second conductor, the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132.

[0076] Since the thickness h1 of the first conductor is smaller than the thickness h2 of the second conductor, the space occupied by the first conductor 131 in the stator slot 14 can be saved, which facilitates the arrangement of other conductors of the stator winding 13 , such as inserting a plurality of second conductors 132 in the stator slot 14 .

[0077] In this embodiment, by making the thickness h1 of the first conductor smaller than the thickness h2 of the second conductor and reducing the thickness h1 of the first conductor, the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132, thereby suppressing the AC loss of the stator winding 13, improving the efficiency of the motor 300, saving space, and facilitating the arrangement of other conductors of the stator winding 13.

[0078] According to some embodiments of this application, see Figure 4 and Figure 5 As shown, Figure 4 yes Figure 2 A cross-sectional schematic diagram of another embodiment of the first conductor; Figure 5 yes Figure 2 Schematic cross-sectional view of another embodiment of the first conductor in FIG. The first conductor 131 has a thickness direction, and the first conductor 131 is provided with at least one first groove 133 along the thickness direction. The shape of the first groove 133 includes but is not limited to a U-shape, a C-shape or a W-shape; illustratively, the shape of the first groove 133 is a U-shape.

[0079] The thickness direction of the first conductor 131 refers to the direction where the thickness h1 of the first conductor is located; for example, the thickness direction of the first conductor 131 is the same as the radial direction of the stator 10 .

[0080] In some embodiments, Figure 4 As shown, the first conductor 131 is provided with a first groove 133 along the thickness direction, and the first groove 133 is provided on the side of the first conductor 131 away from the second conductor 132. For example, the width d1 of the first conductor is the same as the width d2 of the second conductor, and the first groove 133 is provided on the side of the first conductor 131 away from the second conductor 132, so that the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132, and the AC loss of the first conductor 131 is positively correlated with the cross-sectional area of ​​the first conductor 131. By reducing the cross-sectional area of ​​the first conductor 131, the AC loss of the first conductor 131 can be suppressed, and then the AC loss of the stator winding 13 can be suppressed, thereby improving the efficiency of the motor 300. In other embodiments, the first groove 133 can be provided on the side of the first conductor 131 close to the second conductor 132.

[0081] In some embodiments, Figure 5As shown, the first conductor 131 is provided with two first grooves 133 along the thickness direction, one of the two first grooves 133 is provided on the side of the first conductor 131 away from the second conductor 132, and the other of the two first grooves 133 is provided on the side of the first conductor 131 close to the second conductor 132. For example, the width d1 of the first conductor is the same as the width d2 of the second conductor, and the first conductor 131 is provided with two first grooves 133 along the thickness direction, so that the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132, and the AC loss of the first conductor 131 is positively correlated with the cross-sectional area of ​​the first conductor 131. By reducing the cross-sectional area of ​​the first conductor 131, the AC loss of the first conductor 131 can be suppressed, thereby suppressing the AC loss of the stator winding 13, and improving the efficiency of the motor 300.

[0082] According to some embodiments of the present application, the thickness h1 of the first conductor is between 1.25-1.5 mm, and the thickness h2 of the second conductor is between 1.35-1.56 mm. The thickness h1 of the first conductor includes but is not limited to 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm, 1.45 mm, or 1.5 mm, and the thickness h2 of the second conductor includes but is not limited to 1.35 mm, 1.4 mm, 1.45 mm, 1.5 mm, 1.55 mm, or 1.56 mm.

[0083] Specifically, when the thickness h1 of the first conductor is less than the thickness h2 of the second conductor, the thickness h1 of the first conductor is between 1.25-1.5 mm; the thickness h2 of the second conductor is between 1.35-1.56 mm. For example, in one motor 300, the thickness h1 of the first conductor is 1.25 mm, and the thickness h2 of the second conductor is 1.35 mm; or, in another motor 300, the thickness h1 of the first conductor is 1.5 mm, and the thickness h2 of the second conductor is 1.56 mm.

[0084] In some embodiments, a first thickness difference between the thickness h2 of the second conductor and the thickness h1 of the first conductor, and a ratio of the first thickness difference to the thickness h1 of the first conductor are less than a first preset ratio. For example, the first preset ratio is 0.1, and the ratio of the first thickness difference to the thickness h1 of the first conductor is less than 0.1, that is, the thickness h2 of the second conductor increases within 10% relative to the thickness h1 of the first conductor.

[0085] In this embodiment, when the thickness h1 of the first conductor is smaller than the thickness h2 of the second conductor, the thickness h1 of the first conductor is between 1.25-1.5 mm, and the thickness h2 of the second conductor is between 1.35-1.56 mm, so as to be applicable to different types of motors 300 and improve the application scenarios of the stator winding 13.

[0086] According to some embodiments of this application, see Figure 6 As shown, Figure 6 yes Figure 2 A cross-sectional view of another embodiment of the first conductor in FIG.

[0087] When the thickness h1 of the first conductor and the thickness h2 of the second conductor remain unchanged, the width d1 of the first conductor is smaller than the width d2 of the second conductor, so that the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132. For example, when the thickness h1 of the first conductor and the thickness h2 of the second conductor are equal, and the width d1 of the first conductor is smaller than the width d2 of the second conductor, the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132.

[0088] In this embodiment, the width d1 of the first conductor is smaller than the width d2 of the second conductor. By reducing the width d1 of the first conductor, the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132. The AC loss of the first conductor 131 is positively correlated with the cross-sectional area of ​​the first conductor 131. By reducing the cross-sectional area of ​​the first conductor 131, the AC loss of the first conductor 131 can be suppressed, and then the AC loss of the stator winding 13 can be suppressed, thereby improving the efficiency of the motor 300.

[0089] According to some embodiments of this application, see Figure 7 As shown, Figure 7 yes Figure 2 Schematic cross-sectional view of another embodiment of the first conductor in FIG. The first conductor 131 has a width direction, and the first conductor 131 is provided with at least one second groove 134 along the width direction. The shape of the second groove 134 includes but is not limited to a U-shape, a C-shape or a W-shape; illustratively, the shape of the second groove 134 is a U-shape.

[0090] The width direction of the first conductor 131 refers to the direction where the width d1 of the first conductor is located; for example, the width direction of the first conductor 131 is perpendicular to the radial direction of the stator 10 .

[0091] In some embodiments, Figure 7 As shown, the first conductor 131 is provided with two second grooves 134 along the width direction, and the two second grooves 134 are respectively provided on opposite sides of the first conductor 131. For example, the thickness h1 of the first conductor is the same as the thickness h2 of the second conductor, and the first conductor 131 is provided with two second grooves 134 along the width direction, so that the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132, and the AC loss of the first conductor 131 is positively correlated with the cross-sectional area of ​​the first conductor 131. By reducing the cross-sectional area of ​​the first conductor 131, the AC loss of the first conductor 131 can be suppressed, and then the AC loss of the stator winding 13 can be suppressed, thereby improving the efficiency of the motor 300.

[0092] In other embodiments, the first conductor 131 is provided with a second groove 134 along the width direction, and the second groove 134 is provided on one side of the first conductor 131 .

[0093] In some embodiments, the thickness h1 of the first conductor is less than the thickness h2 of the second conductor, and the width d1 of the first conductor is less than the width d2 of the second conductor. By reducing the thickness h1 of the first conductor and the width d1 of the first conductor, the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132, which can suppress the AC loss of the stator winding 13, improve the efficiency of the motor 300, save space, and facilitate the arrangement of other conductors of the stator winding 13.

[0094] According to some embodiments of the present application, Figure 2 and Figure 3 As shown, the stator winding 13 further includes at least one third conductor 135 . The third conductor 135 is disposed close to the stator yoke 11 relative to the second conductor 132 . The thickness h3 of the third conductor is less than the thickness h2 of the second conductor.

[0095] In some embodiments, a plurality of cooling holes 111 are provided on a side of the stator yoke 11 away from the rotor 20, and the cooling holes 111 are used to place cooling liquid to cool the stator winding 13. The cooling liquid includes but is not limited to oil.

[0096] The third conductor 135 is arranged closer to the stator yoke 11 relative to the second conductor 132 , that is, the third conductor 135 is arranged adjacent to the stator yoke 11 , and the third conductor 135 is arranged at the slot bottom of the stator slot 14 .

[0097] Since the third conductor 135 is disposed close to the stator yoke 11, that is, the third conductor 135 is closest to the cooling hole 111, the cooling effect of the third conductor 135 can be ensured. The thickness h3 of the third conductor is smaller than the thickness h2 of the second conductor, so as to reduce the thickness h3 of the third conductor.

[0098] The third conductor 135 of this embodiment is arranged close to the stator yoke 11 relative to the second conductor 132, that is, the third conductor 135 is arranged at the bottom of the stator slot 14, and the thickness h3 of the third conductor is less than the thickness h2 of the second conductor. Reducing the thickness h3 of the third conductor can save material of the third conductor 135, reduce costs, and save the space occupied by the third conductor 135 in the stator slot 14.

[0099] According to some embodiments of the present application, the thickness h5 of the third conductor 135 is less than the thickness h1 of the first conductor, so as to further reduce the thickness h3 of the third conductor. The thickness h3 of the third conductor is the smallest in the same stator slot 14 .

[0100] In this embodiment, the thickness h3 of the third conductor is less than the thickness h1 of the first conductor, that is, the thickness h3 of the third conductor is minimum, which can further save the material of the third conductor 135 , reduce the cost, and further save the space occupied by the third conductor 135 in the stator slot 14 .

[0101] According to some embodiments of the present application, the thickness h3 of the third conductor is between 1.2-1.32 mm, and the thickness h3 of the third conductor includes but is not limited to 1.2 mm, 1.22 mm, 1.25 mm, 1.27 mm, 1.3 mm or 1.32 mm.

[0102] In some embodiments, when the thickness h3 of the third conductor is less than the thickness h2 of the second conductor, the thickness h3 of the third conductor is between 1.2 mm and 1.32 mm. For example, the thickness h2 of the second conductor is 1.35 mm, and the thickness h3 of the third conductor is 1.2 mm.

[0103] In some embodiments, when the thickness h3 of the third conductor is less than the thickness h1 of the first conductor, the thickness h3 of the third conductor is between 1.2-1.32 mm. For example, the thickness h1 of the first conductor is 1.25 mm, the thickness h2 of the second conductor is 1.35 mm, and the thickness h3 of the third conductor is 1.2 mm.

[0104] In some embodiments, the second thickness difference between the thickness h1 of the first conductor and the thickness h3 of the third conductor, and the ratio of the second thickness difference to the thickness h3 of the third conductor are less than the second preset ratio. For example, the second preset ratio is 0.12, and the ratio of the second thickness difference to the thickness h3 of the third conductor is less than 0.12, that is, the thickness h1 of the first conductor increases within 12% relative to the thickness h3 of the third conductor.

[0105] In this embodiment, when the thickness h3 of the third conductor is less than the thickness h2 of the second conductor, the thickness h3 of the third conductor is between 1.2-1.32 mm, so as to be applicable to different types of motors 300 and improve the application scenarios of the stator winding 13. Compared with the prior art in which each winding has the same size, for example, the thickness of the winding is 2 mm, the thickness h3 of the third conductor is between 1.2-1.32 mm, which can save the material of the third conductor 135 and reduce the cost.

[0106] According to some embodiments of the present application, Figure 2 and Figure 3 As shown, the stator winding 13 further includes at least one fourth conductor 136 . The fourth conductor 136 is located between the second conductor 132 and the third conductor 135 . The thickness h4 of the fourth conductor is greater than the thickness h1 of the first conductor.

[0107] Among them, the first conductor 131, the second conductor 132, the fourth conductor 136 and the third conductor 135 are connected in series in sequence. In the above embodiment, the cross-sectional area of ​​the first conductor 131 is reduced, resulting in an increase in the impedance of the stator winding 13. In this embodiment, the thickness h4 of the fourth conductor is greater than the thickness h1 of the first conductor. By increasing the thickness h4 of the fourth conductor, the impedance of the fourth conductor 136 is reduced, thereby reducing the impedance of the stator winding 13 and suppressing the DC loss of the stator winding 13.

[0108] According to some embodiments of the present application, the thickness h4 of the fourth conductor is greater than the thickness h2 of the second conductor, so as to further increase the thickness h4 of the fourth conductor. The thickness h4 of the fourth conductor is the largest in the same stator slot 14 .

[0109] In this embodiment, the thickness h4 of the fourth conductor is greater than the thickness h2 of the second conductor, that is, the thickness h4 of the fourth conductor is the largest in the same stator slot 14 , which reduces the impedance of the fourth conductor 136 , further reduces the impedance of the stator winding 13 , and suppresses the DC loss of the stator winding 13 .

[0110] According to some embodiments of the present application, a thickness h4 of the fourth conductor is between 1.35 mm and 1.6 mm. The thickness h4 of the fourth conductor includes but is not limited to 1.35 mm, 1.4 mm, 1.45 mm, 1.5 mm, 1.55 mm or 1.6 mm.

[0111] In some embodiments, when the thickness h4 of the fourth conductor is greater than the thickness h1 of the first conductor, the thickness h4 of the fourth conductor is between 1.35 mm and 1.6 mm. For example, the thickness h1 of the first conductor is 1.25 mm, the thickness h2 of the second conductor is 1.35 mm, and the thickness h4 of the fourth conductor is 1.35 mm.

[0112] In some embodiments, when the thickness h4 of the fourth conductor is greater than the thickness h2 of the second conductor, the thickness h4 of the fourth conductor is between 1.35 mm and 1.6 mm. For example, the thickness h1 of the first conductor is 1.25 mm, the thickness h2 of the second conductor is 1.35 mm, and the thickness h4 of the fourth conductor is 1.4 mm.

[0113] In this embodiment, when the thickness h4 of the fourth conductor is greater than the thickness h1 of the first conductor, the thickness h4 of the fourth conductor is between 1.35 mm and 1.6 mm, so as to be applicable to different types of motors 300 and improve the application scenarios of the stator winding 13 .

[0114] In some embodiments, Figure 2 and Figure 3As shown, in this embodiment, 8 conductors are inserted into the same stator slot 14. In other embodiments, the same stator slot 14 may be inserted with other numbers of conductors, such as 4 conductors, 6 conductors, 10 conductors or 12 conductors, etc., which is not limited in this application.

[0115] The stator winding 13 includes a first conductor 131, two second conductors 132, four fourth conductors 136 and a third conductor 135, that is, the first conductor 131, two second conductors 132, four fourth conductors 136 and the third conductor 135 are eight conductors inserted in the stator slot 14. Among them, the first conductor 131, the two second conductors 132, the four fourth conductors 136 and the third conductor 135 are connected in series in sequence.

[0116] In the radial direction of the stator 10 , the first conductor 131 , the two second conductors 132 , the four fourth conductors 136 and the third conductor 135 are sequentially arranged in the same stator slot 14 , the first conductor 131 is arranged close to the slot 141 , the third conductor 135 is arranged close to the stator yoke 11 , and the four fourth conductors 136 are located between the two second conductors 132 and the third conductor 135 .

[0117] For example, the thickness h1 of the first conductor is 1.25 mm, the thickness h2 of the second conductor is 1.35 mm, the thickness h4 of the fourth conductor is 1.4 mm, and the thickness h3 of the third conductor is 1.2 mm. Alternatively, the thickness h1 of the first conductor is 1.25 mm, the thickness h2 of the second conductor is 1.35 mm, the thickness h4 of the fourth conductor is 1.4 mm, and the thickness h3 of the third conductor is 1.25 mm.

[0118] In this embodiment, the thickness h1 of the first conductor is smaller than the thickness h2 of the second conductor, so that the cross-sectional area of ​​the first conductor 131 is smaller than the cross-sectional area of ​​the second conductor 132. By reducing the cross-sectional area of ​​the first conductor 131, the AC loss of the first conductor 131 is suppressed, and then the AC loss of the stator winding 13 is suppressed, the efficiency of the motor 300 is improved, space is saved, and other conductors of the stator winding 13 are conveniently arranged. In addition, by making the thickness h3 of the third conductor smaller than the thickness h2 of the second conductor, the thickness h3 of the third conductor is reduced, so that the material of the third conductor 135 can be saved, the cost can be reduced, and the space occupied by the third conductor 135 in the stator slot 14 can be saved. In addition, by increasing the thickness h4 of the fourth conductor, the impedance of the fourth conductor 136 is reduced, and then the impedance of the stator winding 13 is reduced, and the DC loss of the stator winding 13 is suppressed.

[0119] According to some embodiments of this application, see Figure 8 As shown, Figure 8 yes Figure 2The motor 300 of this embodiment is described on the basis of the above embodiment, and at least one third groove 137 is provided on the side wall of the stator tooth 12 close to the fourth conductor 136 .

[0120] When the motor 300 is working, the magnetic field passes through the stator teeth 12 from the stator yoke 11 and enters the rotor 20; or, the magnetic field passes through the stator teeth 12 from the rotor 20 and enters the stator yoke 11; the width of the stator teeth 12 near the slot 141 is narrow, and the magnetic resistance of the stator teeth 12 near the slot 141 is large, which is prone to magnetic saturation, and the third groove 137 cannot be set in the area of ​​the stator teeth 12 near the slot 141. Therefore, a plurality of third grooves 137 are set on the side wall of the stator teeth 12 near the fourth conductor 136, such as Figure 8 shown.

[0121] In this embodiment, at least one third groove 137 is provided on the side wall of the stator tooth 12 close to the fourth conductor 136 to increase the gap between the stator winding 13 and the stator tooth 12, thereby suppressing the AC loss of the stator winding 13 and improving the efficiency of the motor 300.

[0122] According to some embodiments of the present application, the ratio of the width of the third groove 137 to the thickness h4 of the fourth conductor is between 0.8-1.2, and the ratio of the width of the third groove 137 to the thickness h4 of the fourth conductor includes but is not limited to 0.8, 0.9, 1.0, 1.1 or 1.2. The depth of the third groove 137 is between 0.2-0.6 mm, and the depth of the third groove 137 includes but is not limited to 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm or 0.6 mm.

[0123] In some embodiments, the thickness h4 of the fourth conductor is 1.4 mm, the width of the third groove 137 is 1.4 mm, and the depth of the third groove 137 is 0.4 mm; or, the thickness h4 of the fourth conductor is 1.4 mm, the width of the third groove 137 is 1.54 mm, and the depth of the third groove 137 is 0.4 mm; or, the thickness h4 of the fourth conductor is 1.4 mm, the width of the third groove 137 is 1.32 mm, and the depth of the third groove 137 is 0.4 mm.

[0124] In this embodiment, the ratio between the width of the third groove 137 and the thickness h4 of the fourth conductor is between 0.8-1.2, and the depth of the third groove 137 is between 0.2-0.6 mm. It is suitable for different stator teeth 12 and thus can be suitable for different types of motors 300, thereby improving the application scenarios of the stator winding 13.

[0125] In some embodiments, Figure 8As shown, the first conductor 131 is provided with two first grooves 133 along the thickness direction, and the second conductor 132 is also provided with two first grooves 133 along the thickness direction.

[0126] In this embodiment, the first conductor 131 is provided with two first grooves 133 along the thickness direction, and the second conductor 132 is also provided with two first grooves 133 along the thickness direction, so as to suppress the AC loss of the stator winding 13 and improve the efficiency of the motor 300 .

[0127] In some embodiments, Fig. 9 As shown, the first conductor 131 is provided with two second grooves 134 along the width direction, and the second conductor 132 is also provided with two second grooves 134 along the width direction.

[0128] In this embodiment, the first conductor 131 is provided with two second grooves 134 along the width direction, and the second conductor 132 is also provided with two second grooves 134 along the width direction, so as to suppress the AC loss of the stator winding 13 and improve the efficiency of the motor 300.

[0129] The present application also provides a motor 300, such as Figure 2 As shown, the motor 300 includes a stator 10 and a rotor 20. The stator 10 may be the stator 10 disclosed in the above embodiment, which will not be described in detail herein.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A stator of a motor, characterized in that: include: stator yoke; A plurality of stator teeth are arranged on a side of the stator yoke close to the rotor of the motor, and a stator slot is formed between two adjacent stator teeth; a stator winding, arranged on the plurality of stator teeth, comprising at least one first conductor and at least one second conductor, wherein the first conductor and the second conductor are inserted into the stator slots, and the first conductor is arranged away from the stator yoke relative to the second conductor; In the radial direction of the stator, the cross-sectional area of ​​the first conductor is smaller than the cross-sectional area of ​​the second conductor, wherein the thickness of the first conductor is smaller than the thickness of the second conductor, and / or the width of the first conductor is smaller than the width of the second conductor; The stator winding further comprises at least one third conductor, the third conductor is arranged close to the stator yoke relative to the second conductor, the thickness of the third conductor is smaller than the thickness of the second conductor, and the thickness of the third conductor is smaller than the thickness of the first conductor; The stator winding further includes at least one fourth conductor, wherein the fourth conductor is located between the second conductor and the third conductor, and the thickness of the fourth conductor is greater than that of the first conductor.

2. The stator according to claim 1, characterized in that: The first conductor has a thickness direction, and the first conductor is provided with at least one first groove along the thickness direction.

3. The stator according to claim 1, characterized in that: The thickness of the first conductor is between 1.25-1.5 mm; the thickness of the second conductor is between 1.35-1.56 mm.

4. The stator according to claim 1, characterized in that: The first conductor has a width direction, and the first conductor is provided with at least one second groove along the width direction.

5. The stator according to claim 1, characterized in that: The thickness of the third conductor is between 1.2 mm and 1.32 mm.

6. The stator according to claim 1, characterized in that: The thickness of the fourth conductor is greater than the thickness of the second conductor.

7. The stator according to claim 1, characterized in that: The thickness of the fourth conductor is between 1.35 mm and 1.6 mm.

8. The stator according to claim 1, characterized in that: At least one third groove is arranged on the side wall of the stator tooth close to the fourth conductor.

9. The stator according to claim 8, characterized in that: The ratio of the width of the third groove to the thickness of the fourth conductor is between 0.8-1.2, and the depth of the third groove is between 0.2-0.6 mm.

10. A motor, characterized in that: Comprising a stator as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising the motor as claimed in claim 10.

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