Electric machine stator, electric machine and flywheel energy storage device

Abstract

The utility model discloses a motor stator, motor and flywheel energy storage device, motor stator includes: silicon steel sheet, is set up with cooperation groove on silicon steel sheet, is provided with first step portion and second step portion in cooperation groove, first step portion sets up in the slot mouth department of cooperation groove, and second step portion sets up in the one side of the slot mouth of cooperation groove away from first step portion of second step portion, stator coil is set up in cooperation groove, and stator coil is located in the one side of second step portion away from first step portion. Second step portion sets up in the one side of the slot mouth of cooperation groove away from first step portion, and stator coil is located in the one side of second step portion away from first step portion, so can make stator coil away from the slot mouth setting, can reduce the influence that high harmonic brings skin effect, solve the problem that the skin effect of slot mouth portion stator coil is big, reduce the heat output and ageing problem of stator coil, can avoid big magnetic flux leakage simultaneously, in addition can also weaken the heat of motor rotor, thereby can increase the life of motor.

Description

Technical Field

[0001] This utility model relates to the field of flywheel energy storage device technology, and in particular to a motor stator, motor and flywheel energy storage device. Background Technology

[0002] In related technologies, flywheel energy storage devices mainly operate in a magnetic levitation vacuum environment. The motor rotor is in a high-speed rotation state for a long time. The motor is powered by a frequency converter, has a high frequency, and has high-order harmonics. The stator coil of the motor has a large skin effect, and the heat generation at the slot of the motor is most obvious. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a motor stator that can reduce the skin effect caused by high-order harmonics, solve the problem of large skin effect in the stator coil at the slot, and reduce the heat generation and aging problems of the stator coil.

[0004] This utility model further proposes an electric motor.

[0005] This utility model further proposes a flywheel energy storage device.

[0006] The motor stator according to this utility model includes: a silicon steel sheet, on which a mating groove is formed, a first step portion and a second step portion are provided in the mating groove, the first step portion is provided at the opening of the mating groove, and the second step portion is provided on the side of the first step portion away from the opening of the mating groove; and a stator coil, the stator coil is provided in the mating groove, and the stator coil is located on the side of the second step portion away from the first step portion.

[0007] According to the present invention, the second step portion of the motor stator is located on the side of the first step portion away from the slot opening, and the stator coil is located on the side of the second step portion away from the first step portion. This allows the stator coil to be located away from the slot opening, which can reduce the influence of the skin effect caused by high-order harmonics, solve the problem of large skin effect of the stator coil in the slot opening, reduce the heat generation and aging of the stator coil, avoid large leakage flux, and reduce the heat generation of the motor rotor, thereby increasing the life of the motor.

[0008] In some examples of this utility model, the surface of the second step portion away from the first step portion is a support surface, and the stator coil is in contact with the support surface.

[0009] In some examples of this invention, the support surface is constructed as a plane.

[0010] In some examples of this utility model, the stator coil includes: copper wire and an insulating component, wherein the copper wire is disposed within the insulating component and the insulating component is disposed within the mating groove.

[0011] In some examples of this utility model, the copper wire is constructed as a flat copper wire structure.

[0012] In some examples of this utility model, there are multiple copper wires connected in parallel.

[0013] In some examples of this utility model, the motor stator further includes: potting resin, which fills the space between the stator coil and the groove of the mating slot.

[0014] In some examples of this utility model, there are multiple mating grooves, and the multiple mating grooves are spaced apart in the circumferential direction of the silicon steel sheet.

[0015] The motor according to this utility model includes: a motor rotor and a motor stator as described above, wherein the motor rotor is rotatable around the motor stator.

[0016] The flywheel energy storage device according to this utility model includes: a flywheel and the motor described above, wherein the flywheel and the motor rotor are driven together.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a cross-sectional view of the motor stator according to an embodiment of the present utility model; Figure 2 This is a partial structural schematic diagram of the motor stator according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of silicon steel sheet.

[0019] Figure label: 1. Motor stator; 10. Silicon steel sheet; 100. Mating groove; 101. First step; 102. Second step; 103. Groove opening; 104. Support surface; 20. Stator coil; 200. Copper wire; 201. Insulating component; 30. Encapsulating resin. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0021] The following is for reference. Figures 1-3 The motor stator 1 according to an embodiment of the present utility model is described.

[0022] like Figures 1-3 As shown, the motor stator 1 according to an embodiment of the present invention includes: silicon steel sheets 10 and stator coils 20. The silicon steel sheets 10 can form a stator core by stacking, which can provide an efficient magnetic circuit, have good magnetic permeability and low iron loss. The stator coils 20 can generate a magnetic field when energized, and can be used to generate a rotating magnetic field or induced electromotive force to realize energy conversion.

[0023] like Figures 1-3 As shown, a mating groove 100 is formed on the silicon steel sheet 10. The mating groove 100 can be used to install and position the stator coil 20, providing a magnetic flux path and improving the electromagnetic performance and heat dissipation of the motor. A first step portion 101 and a second step portion 102 are provided within the mating groove 100. The first step portion 101 is located at the groove opening 103 of the mating groove 100, and the second step portion 102 is located on the side of the first step portion 101 away from the groove opening 103. That is, the first step portion 101 and the second step portion 102 together form a stepped shape. The first step portion 101 is located at the groove opening 103 of the mating groove 100, while the second step portion 102 is located away from the groove opening 103. Thus, the first step portion 101 can increase the reluctance and reduce the leakage flux, while the second step portion 102 can ensure small torque fluctuations.

[0024] like Figure 1 As shown, the stator coil 20 is disposed within the mating slot 100, and the stator coil 20 is located on the side of the second step portion 102 away from the first step portion 101. The stator coil 20 being disposed within the mating slot 100 generates a rotating magnetic field, enabling the conversion of electromagnetic energy. The stator coil 20 is located on the side of the second step portion 102 away from the first step portion 101, and the second step portion 102 is located on the side of the first step portion 101 away from the slot opening 103 of the mating slot 100. This allows the electronic coil 20 to be positioned away from the slot opening 103, thereby reducing the skin effect caused by higher harmonics, solving the problem of a large skin effect in the stator coil 20 at the slot opening 103, reducing heat generation and aging issues of the stator coil 20, avoiding large leakage flux, and also reducing rotor heating, thus increasing the motor's lifespan.

[0025] Therefore, the second step portion 102 is located on the side of the first step portion 101 away from the slot 103 of the mating groove 100, and the stator coil 20 is located on the side of the second step portion 102 away from the first step portion 101. This allows the stator coil 20 to be located away from the slot 103, which can reduce the skin effect caused by high-order harmonics, solve the problem of large skin effect of the stator coil 20 in the slot 103 part, reduce the heat generation and aging problem of the stator coil 20, avoid large leakage flux, and also reduce the heat generation of the motor rotor, thereby increasing the life of the motor.

[0026] Specifically, such as Figure 1 and Figure 3 As shown, the surface of the second step portion 102 away from the first step portion 101 is a support surface 104, and the stator coil 20 is in contact with the support surface 104. The support surface 104 can serve as a mounting support and can be used to install other components. When the stator coil 20 is in contact with the support surface 104, the stator coil 20 is located on the side of the second step portion 102 away from the first step portion 101. At this time, the second step portion 102 can support the stator coil 20, which facilitates the installation of the electronic coil. The stator coil 20 can be placed in the mating groove 100, thereby generating a rotating magnetic field, driving the motor rotor to rotate, and realizing the conversion of electromagnetic energy.

[0027] Among them, such as Figure 1 and Figure 3 As shown, the support surface 104 is constructed as a plane. The planar support surface 104 has good contact consistency, which can ensure a tighter fit between the motor coil and the mating groove 100, helping to improve the uniformity of the air gap between the motor stator 1 and the motor rotor, and reducing vibration and noise caused by eccentricity. Secondly, the large planar contact area provides a more direct heat conduction path, which is conducive to the rapid conduction of heat generated by the stator coil 20 to the silicon steel sheet 10 or the outer shell, reducing temperature rise and improving the reliability of motor operation. In addition, the planar support surface 104 helps to reduce magnetic circuit asymmetry caused by assembly errors, which can improve magnetic field distribution, reduce magnetic harmonics and losses, and improve motor efficiency. The planar support surface 104 can also play an auxiliary fixing role, preventing the coil from shifting or loosening due to vibration during operation, effectively reducing operating noise and extending motor life. By constructing the support surface 104 as a plane, the second step portion 102 is more in line with the actual working conditions, and can better achieve contact between the stator coil 20 and the support surface 104.

[0028] In addition, such as Figure 1As shown, the stator coil 20 includes a copper wire 200 and an insulating component 201. The copper wire 200 is disposed inside the insulating component 201, and the insulating component 201 is disposed inside the mating groove 100. The copper wire 200 is the core conductive part of the stator coil 20. It generates a magnetic field when energized. The insulating component 201 provides insulation, isolating the copper wire 200 from the silicon steel sheet 10 to prevent short circuits. The copper wire 200 is housed within the insulating component 201, ensuring electrical isolation between them and preventing short circuits, breakdowns, and other electrical faults. This extends the lifespan of the stator coil 20 and ensures safe and stable motor operation. Furthermore, the insulating component 201 provides physical protection for the copper wire 200, reducing damage caused by vibration or other external forces. Additionally, it improves heat dissipation, increasing motor efficiency and lifespan, and enhancing reliability and durability. The insulating component 201 is positioned within the mating groove 100, allowing the stator coil 20 to be placed within it. This generates a rotating magnetic field, driving the motor rotor and converting electromagnetic energy, ensuring safe and stable motor operation.

[0029] Of course, such as Figure 1 As shown, the copper wire 200 is constructed as a flat copper wire structure. The flat copper wire structure is compact, which improves the slot fill factor. Secondly, the flat copper wire structure has a larger cross-sectional area, resulting in lower resistance under the same current, reducing copper loss and improving efficiency. Furthermore, the flat copper wire structure has a large contact area with the matching slot 100, resulting in a shorter heat conduction path and improved heat dissipation performance. In addition, the flat copper wire structure is more suitable for high-speed, high-vibration environments, has strong deformation resistance, and is easier to automate, improving production efficiency and consistency. Constructing the copper wire 200 as a flat copper wire structure better suits actual working conditions. In actual working conditions, setting the flat copper wire structure away from the slot opening 103 can reduce the skin effect caused by higher harmonics, reduce the skin effect of the copper wire 200 at the slot opening 103, reduce heat generation and aging problems of the copper wire 200, and increase the service life of the motor.

[0030] Furthermore, such as Figure 1As shown, there are multiple copper wires 200 connected in parallel. Multiple copper wires 200 can generate a magnetic field when energized. This parallel connection effectively disperses the current in high-power motors or applications requiring high current handling, preventing individual wires from overheating and improving motor safety and reliability. Secondly, using multiple copper wires 200 in parallel reduces their wire gauge size, increasing the surface area of ​​the stator coils 20 without sacrificing slot fill factor, improving heat dissipation and facilitating a more compact design. Furthermore, it effectively reduces the skin effect, minimizing heat generation and aging issues, thus extending motor lifespan.

[0031] In addition, such as Figure 1 As shown, the motor stator 1 also includes a potting resin 30, which is filled between the stator coil 20 and the slot 103 of the mating groove 100. The potting resin 30 protects the components from external environmental influences and provides mechanical support and thermal management. Filling the space between the stator coil 20 and the slot 103 of the mating groove 100 with the potting resin 30 effectively prevents corona discharge, partial discharge, or short circuits, and improves the withstand voltage rating of the stator coil 20. Furthermore, after filling with the potting resin 30, a stronger connection is formed between the stator coil 20 and the silicon steel sheet 10, preventing displacement or loosening of the stator coil 20 during operation due to vibration or centrifugal force. Additionally, the potting resin 30 can... Using it as a heat-conducting medium, the heat generated by the stator coil 20 can be more effectively conducted to the silicon steel sheet 10 or the outer shell, which can improve the thermal conductivity. At this time, the cracking problem of the potting resin 30 can be improved. For the flat copper wire 200 structure, the flat copper wire 200 structure has a tighter contact with the groove wall of the mating groove 100. The filling of the potting resin 30 can further improve the overall heat dissipation efficiency. At the same time, the potting resin 30 can seal the gap in the groove 103 area to prevent moisture, dust, oil and other contaminants from entering the stator coil 20, thereby improving the protection level of the motor.

[0032] It should be noted that, as Figure 2 As shown, there are multiple mating slots 100, which are spaced apart circumferentially on the silicon steel sheet 10. These multiple mating slots 100 can be used to install and position multiple stator coils 20, providing magnetic flux paths. This improves the electromagnetic performance and heat dissipation of the motor. The spaced-apart arrangement of the multiple mating slots 100 on the circumferential surface of the silicon steel sheet 10 avoids interference between them and allows for a wider distribution of the slots, which also contributes to improving the electromagnetic performance and heat dissipation of the motor.

[0033] The motor according to an embodiment of the present invention includes: a motor rotor and a motor stator 1 as described in the above embodiments. The motor rotor can rotate around the motor stator 1. The motor stator 1 can generate a fixed or rotating magnetic field, which can be used to drive the motor rotor. The motor rotor can rotate under the action of the magnetic field generated by the motor stator 1 and output mechanical energy. Current is passed through the stator coil 20 in the motor stator 1, generating a magnetic field in the silicon steel sheet 10. Under the action of this magnetic field, the motor rotor is subjected to electromagnetic torque and begins to rotate. The motor rotor outputs mechanical power through the shaft to drive the external load, thereby realizing the conversion of electrical energy into mechanical energy.

[0034] The flywheel energy storage device according to an embodiment of this utility model includes: a flywheel and a motor as described in the above embodiments, wherein the flywheel and the motor rotor are driven together. The flywheel mainly stores and releases energy. The motor can either drive the flywheel to accelerate as a motor or extract energy from the decelerating flywheel as a generator. When the motor is charging, it can act as a motor, driving the motor rotor to rotate, and the motor rotor in turn drives the flywheel to rotate. At this time, the flywheel stores kinetic energy. When discharging, the motor acts as a generator, and the flywheel uses the stored kinetic energy to drive the motor rotor to rotate. At this time, the motor works as a generator, converting kinetic energy into electrical energy and releasing it.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0038] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A motor stator (1), characterized in that, include: A silicon steel sheet (10) is provided with a mating groove (100). The mating groove (100) is provided with a first step (101) and a second step (102). The first step (101) is located at the opening (103) of the mating groove (100), and the second step (102) is located on the side of the first step (101) away from the opening (103) of the mating groove (100). Stator coil (20) is disposed in the mating groove (100) and the stator coil (20) is located on the side of the second step portion (102) away from the first step portion (101).

2. The motor stator (1) according to claim 1, characterized in that, The surface of the second step portion (102) away from the first step portion (101) is a support surface (104), and the stator coil (20) is in contact with the support surface (104).

3. The motor stator (1) according to claim 2, characterized in that, The support surface (104) is constructed as a plane.

4. The motor stator (1) according to claim 1, characterized in that, The stator coil (20) includes a copper wire (200) and an insulating component (201), wherein the copper wire (200) is disposed within the insulating component (201) and the insulating component (201) is disposed within the mating groove (100).

5. The motor stator (1) according to claim 4, characterized in that, The copper wire (200) is constructed as a flat copper wire structure.

6. The motor stator (1) according to claim 4, characterized in that, There are multiple copper wires (200), and the multiple copper wires (200) are connected in parallel.

7. The motor stator (1) according to claim 1, characterized in that, Also includes: Encapsulating resin (30) is filled between the stator coil (20) and the slot (103) of the mating groove (100).

8. The motor stator (1) according to claim 1, characterized in that, There are multiple mating grooves (100), and the multiple mating grooves (100) are spaced apart in the circumferential direction of the silicon steel sheet (10).

9. An electric motor, characterized in that, include: Motor rotor; The motor stator (1) according to any one of claims 1-8, wherein the motor rotor is rotatable about the motor stator (1).

10. A flywheel energy storage device, characterized in that, include: flywheel; The motor of claim 9, wherein the flywheel is driven in conjunction with the motor rotor.

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