Stator for a high-voltage electric machine and high-voltage electric machine

Abstract

The utility model relates to a kind of stator for high-voltage motor, the stator includes: stator core, including stator slot;And stator winding, it is set in stator slot, wherein stator winding includes: low-voltage winding, in the way of shaped winding, is embedded in stator slot, wherein low-voltage winding is electrically connected to low-voltage power supply, and is configured to receive power from low-voltage power supply to start high-voltage motor;And high-voltage winding, in the way of shaped winding, is embedded in stator slot, wherein high-voltage winding is stacked with low-voltage winding in the installation direction from the slot bottom of stator slot to slot mouth, and is electrically connected to high-voltage power supply, and is configured to receive power from high-voltage power supply to make high-voltage motor run in rated operating state. According to the stator of the utility model, manufacturing cost is low, can protect power grid and motor equipment when starting, reduce failure rate.

Description

Technical Field

[0001] This utility model relates to a stator for a high-voltage motor and a high-voltage motor. Background Technology

[0002] Variable frequency drive (VFD) starting enables soft starting of motors, resulting in lower starting current and reduced impact on the power grid and motor. This not only reduces energy consumption during startup but also minimizes wear on mechanical components, extending equipment lifespan. High-voltage motors refer to motors with a rated operating voltage of 1000V and above. If a high-voltage motor is started at full voltage, the motor rotor may experience quality problems due to high temperature or high current during startup. Furthermore, the number of startup attempts is strictly limited, and due to power grid constraints, the starting current is typically 5.5-6.5 times the motor's rated current. Excessive starting current can impact the power grid, potentially causing equipment shutdown. Meeting this requirement necessitates special designs that sacrifice performance or increase costs. While VFD starting of high-voltage motors can solve these problems, high-voltage VFDs are extremely expensive, adding excessive costs if only used for startup. Utility Model Content

[0003] In view of this, this utility model proposes a novel stator for high-voltage motors. This design utilizes an inexpensive low-voltage frequency converter to assist in the soft starting of the high-voltage motor. During the soft starting process, there is no stall phase, resulting in less temperature rise in the motor rotor bars and avoiding the large current surge during direct starting. This protects the power grid and motor equipment, reduces the failure rate, and allows for multiple consecutive hot starts under special operating conditions.

[0004] According to a preferred embodiment of the present invention, a stator for a high-voltage motor is provided. The stator includes: a stator core including stator slots; and a stator winding disposed in the stator slots. The stator winding includes: a low-voltage winding embedded in the stator slots in a shaped winding configuration, wherein the low-voltage winding is electrically connected to a low-voltage power supply and configured to receive power from the low-voltage power supply to start the high-voltage motor; and a high-voltage winding embedded in the stator slots in a shaped winding configuration, wherein the high-voltage winding is stacked with the low-voltage winding in the mounting direction from the bottom to the opening of the stator slot, and is electrically connected to the high-voltage power supply and configured to receive power from the high-voltage power supply to enable the high-voltage motor to operate in its rated operating state. The present invention designs a winding for low-voltage drive starting a high-voltage motor, wherein a set of low-voltage windings is provided in the stator windings. During startup, the low-voltage power supply is connected for starting, and after the startup process is completed, the high-voltage power supply is switched to enable the high-voltage motor to operate in its rated state.

[0005] According to an exemplary embodiment of the present invention, the low-voltage winding is connected to a low-voltage power supply via a low-voltage frequency converter, wherein the power from the low-voltage power supply is converted by the low-voltage frequency converter into a voltage with gradually increasing frequency and supplied to the low-voltage winding. Thus, the stator according to the present invention can be started by the low-voltage frequency converter from the low-voltage winding of the stator winding. The low-voltage frequency converter can gradually increase the output frequency and voltage, causing the motor to gradually accelerate from a low speed until it reaches the predetermined speed of the high-voltage motor, so as to switch to driving the high-voltage motor by the high-voltage power supply.

[0006] According to an exemplary embodiment of the present invention, the low-voltage winding includes a first sub-winding and a second sub-winding, which are stacked in the mounting direction. The stator winding also includes a first spacer strip disposed between the low-voltage winding and the high-voltage winding. This improves the flexibility and reliability of starting the high-voltage motor, enabling it to start smoothly without damaging the motor equipment.

[0007] According to an exemplary embodiment of this utility model, both the first sub-winding and the second sub-winding adopt a double-wire parallel winding structure, and the number of turns in both the first sub-winding and the second sub-winding is one. Through this simple winding structure, the number of turns and current distribution of the low-voltage winding are ensured to be consistent, thereby improving the current carrying capacity of the high-voltage motor during startup, enhancing the heat dissipation performance of the winding, and improving the electromagnetic performance of the winding.

[0008] According to an exemplary embodiment of the present invention, the high-voltage winding includes a third sub-winding and a fourth sub-winding, which are stacked in the mounting direction. The stator winding also includes a second spacer strip disposed between the third and fourth sub-windings. This improves the power factor and efficiency of the high-voltage motor and reduces electromagnetic interference within the high-voltage motor.

[0009] According to an exemplary embodiment of this invention, both the third and fourth sub-windings employ a wire transposition structure, and the number of turns in both the third and fourth sub-windings is even. Using wire transposition in the winding design means that the wires are not continuous straight lines within the winding, but rather their positions are exchanged at periodic intervals. This saves slot space for arranging single-turn windings. Furthermore, the newly added single-turn winding can also be considered a magnetic slot wedge, having almost no impact on the rated performance of the motor.

[0010] According to an exemplary embodiment of the present invention, the first sub-winding, the second sub-winding, the third sub-winding, and the fourth sub-winding are made of wires of the same specification and have the same insulation characteristics, and the pitch of the first sub-winding, the second sub-winding, the third sub-winding, and the fourth sub-winding is the same. This reduces the manufacturing cost of the stator winding of the high-voltage motor according to the present invention, simplifies the structure of the stator winding, ensures the consistency of the stator winding, and makes the current distribution uniform.

[0011] According to an exemplary embodiment of the present invention, the stator winding further includes: an adjusting shim strip disposed between the low-voltage winding and the slot opening of the stator slot; a slot opening shim strip disposed between the adjusting shim strip and the slot opening; and magnetic slot filler disposed at the slot opening and filling the space between the slot opening and the slot opening shim strip. Using magnetic slot filler at the slot opening can reduce excitation current and core losses, thereby improving the power factor.

[0012] According to a preferred embodiment of the present invention, a high-voltage motor is provided, comprising: a housing; a stator as described above, disposed within the housing; a main junction box disposed on the outer surface of the housing, wherein a high-voltage winding is connected to a first terminal in the main junction box and connected to a high-voltage power supply via the first terminal; and a starter junction box disposed on the outer surface of the housing, separate from the main junction box, wherein a low-voltage winding is connected to a second terminal in the starter junction box and connected to a low-voltage power supply via the second terminal. Attached Figure Description

[0013] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the above and other features and advantages of the present invention, in which:

[0014] Figure 1 A cross-sectional view of the stator of a high-voltage motor according to an embodiment of the present invention is shown.

[0015] Figure 2 A cross-sectional view of the stator winding of a high-voltage motor according to an embodiment of the present invention is shown.

[0016] Figure 3 A cross-sectional view of the stator core of a high-voltage motor equipped with stator windings according to an embodiment of the present invention is shown.

[0017] Figure 4 A cross-sectional view of a high-voltage motor having a stator core and rotor windings according to an embodiment of the present invention is shown.

[0018] Explanation of icon numbers:

[0019] 10. Stator core; 11. Stator slot; 12. Slot bottom

[0020] 13. Groove; 14. Stator reinforcement; 15. Stator ventilation duct.

[0021] 20. Stator winding; 21. Low-voltage winding; 22. High-voltage winding

[0022] 211, First sub-winding; 212, Second sub-winding; 221, Third sub-winding

[0023] 222, Fourth sub-winding; 23, First spacer; 24, Second spacer.

[0024] 25. Adjusting shim strip; 26. Groove shim strip; 27. Magnetic groove putty.

[0025] 30. Housing; 40. Rotor shaft; 41. Rotor windings Detailed Implementation

[0026] To enable those skilled in the art to better understand the solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other solutions obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0027] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. For example, a product or device that comprises a series of units is not necessarily limited to those units that are explicitly listed, but may include other units that are not listed or that are inherent to such products or devices.

[0028] Figure 1 A cross-sectional view of the stator of a high-voltage motor according to an embodiment of the present invention is shown; Figure 2 A cross-sectional view of the stator winding of a high-voltage motor according to an embodiment of the present invention is shown.

[0029] See Figure 1 According to this embodiment, the stator of the high-voltage motor includes a stator core 10 and a stator winding 20. The stator core 10 includes stator slots 11. The stator winding 20 is disposed in the stator slots 11. The stator winding 20 includes a low-voltage winding 21 and a high-voltage winding 22. The low-voltage winding 21 is embedded in the stator slots 11 in a shaped winding manner, and is electrically connected to a low-voltage power supply and configured to receive power from the low-voltage power supply to start the high-voltage motor. The high-voltage winding 22 is embedded in the stator slots 11 in a shaped winding manner, stacked with the low-voltage winding 21 in the mounting direction from the bottom 12 to the opening 13 of the stator slot 11, and is electrically connected to the high-voltage power supply and configured to receive power from the high-voltage power supply to operate the high-voltage motor in its rated operating state.

[0030] The stator core 10 is typically made of a high magnetic permeability material. The stator core 10 includes a plurality of stator slots 11 arranged along the inner circumference. The presence of these slots is not only to enhance the mechanical strength of the stator core 10, but also to embed the stator winding 20 according to the present invention.

[0031] Each stator slot 11 extends either in a direction toward the center of the stator core 10 or in a radial direction of the stator core 10. The layout and design of the stator windings 20 directly affect the energy conversion efficiency and operating performance of the motor, and include two types of windings: a low-voltage winding 21 and a high-voltage winding 22. The configuration of the low-voltage windings 21 and the high-voltage windings 22 enables variable frequency soft starting of the high-voltage motor according to this embodiment.

[0032] The shaped winding according to this invention is also known as a pre-formed winding. During coil manufacturing, the conductor is pre-formed according to a specific shape and size before being installed onto the stator of the equipment. For example, this shaped winding uses high-temperature resistant, high-insulation materials, such as enameled wire and fiberglass, to enhance its performance in harsh environments. During manufacturing, the conductor is bent, twisted, and compressed into the desired shape, then wrapped with insulating material to form a robust coil. Finally, these coils are installed onto the iron core of the equipment to form a complete winding.

[0033] The low-voltage winding 21 is connected to the low-voltage power supply during the motor startup phase, providing initial power to the motor with a relatively low voltage to ensure a smooth start. This process fully utilizes the characteristics of the low-voltage winding 21, which can generate sufficient electromagnetic force to drive the rotor to start rotating even at a relatively low voltage.

[0034] The high-voltage winding 22 functions after the motor starts and enters its rated operating state. The high-voltage winding 22 extends along the stator slot 11 from the slot bottom 12 to the slot opening 13, stacked with the low-voltage winding 21. The slot bottom 12 of each stator slot 11 is close to the inner wall of the stator core 10, and the slot opening 13 of each stator slot 11 is away from the inner wall and close to the center of the stator core 10. This arrangement aims to maximize magnetic field utilization and heat dissipation performance of the winding. The high-voltage winding 22 is connected to a high-voltage power supply and can withstand higher voltages, thereby providing a stronger electromagnetic drive force during normal motor operation and ensuring efficient and stable motor operation under rated load.

[0035] The stacking design of the two windings is not a simple physical superposition. It not only takes into account the electrical isolation between the windings to avoid electrical faults caused by the influence of the high voltage electric field on the low voltage winding, but also takes into account the uniformity of the magnetic field distribution and the efficiency of winding heat dissipation, thereby improving the overall reliability and performance of the motor.

[0036] In a preferred embodiment, the low-voltage winding 21 is connected to a low-voltage power supply via a low-voltage frequency converter, wherein the power from the low-voltage power supply is converted by the low-voltage frequency converter into a voltage with gradually increasing frequency and supplied to the low-voltage winding.

[0037] This configuration allows electrical energy drawn from a low-voltage power supply to be modulated and converted by the frequency converter into a progressively increasing output voltage, which is then supplied to the low-voltage winding. The low-voltage frequency converter, acting as an energy conversion device between the low-voltage power supply and the load, converts a constant or varying input voltage into an output voltage of the desired frequency. Low-voltage frequency converters typically involve using an inverter circuit to convert direct current (DC) to alternating current (AC) and using a programmable control circuit to regulate the frequency of the output signal. This process not only enables a gradual increase in frequency but also ensures the quality of the output voltage, meeting the dynamic requirements of specific applications. In this embodiment, for example, the high-voltage power supply can provide an output voltage of 6kV or 10kV, and the low-voltage power supply can provide an output voltage of 380V or 660V.

[0038] See Figure 2 The low-voltage winding 21 includes a first sub-winding 211 and a second sub-winding 212, which are stacked in the installation direction. This stacking arrangement of the two windings according to a pre-defined installation direction not only makes full use of space resources but also effectively enhances the heat dissipation capacity and mechanical strength of the electrical equipment, thereby improving overall efficiency and reliability.

[0039] The stator winding 20 also includes a first spacer strip 23, which is disposed between the low-voltage winding 21 and the high-voltage winding 22. This first spacer strip 23 not only physically isolates the low-voltage winding 21 and the high-voltage winding 22, reducing electromagnetic interference between them and thus improving the system's insulation performance, but also acts as a thermal barrier, effectively preventing heat from being directly transferred from one winding to another, promoting temperature management, and extending the motor's service life. Because high-voltage insulation is used, only low-voltage power is connected to the low-voltage winding 21; therefore, no additional spacer strip is added between the single-turn low-voltage sub-windings, i.e., the first sub-winding 211 and the second sub-winding 212.

[0040] In a preferred embodiment, both the first sub-winding 211 and the second sub-winding 212 employ a double-wire parallel winding structure, and both sub-windings 211 and 212 have one number of turns. In each sub-winding, two wires are wound in parallel, together forming the main body of the sub-winding. The advantage of this design is that it effectively reduces the AC resistance of the windings, reduces eddy current losses, and improves the overall efficiency and performance of the equipment. The two sub-windings are electrically isolated while maintaining a low winding inductive reactance or achieving a specific magnetic flux distribution.

[0041] In a further embodiment, the high-voltage winding 22 includes a third sub-winding 221 and a fourth sub-winding 222, which are stacked in the mounting direction. The two sub-windings are arranged sequentially in physical space to form a multi-layered winding structure. The stator winding 20 also includes a second spacer 24, which is disposed between the third sub-winding 221 and the fourth sub-winding 222.

[0042] The second spacer 24 is positioned at the interface between the third sub-winding 221 and the fourth sub-winding 222. Its main function is to provide an insulation barrier to prevent current from being conducted along unintended paths. Simultaneously, through its supporting and separating effects, it enhances the durability and deformation resistance of the entire winding structure. This design strategy not only improves the safety of motor operation but also optimizes electrical performance under high-voltage conditions.

[0043] In a preferred embodiment, both the third sub-winding 221 and the fourth sub-winding 222 employ a conductor transposition structure, and the number of turns in both the third sub-winding 221 and the fourth sub-winding 222 is even. This design strategy aims to balance the magnetic field distribution, reduce electromagnetic interference, and optimize overall electrical performance.

[0044] Specifically, the conductor transposition structure of the third sub-winding 221 and the fourth sub-winding 222 effectively reduces the effects of proximity and skin effects by periodically exchanging the positions of the conductors within the windings, thereby improving the uniform distribution of current within the conductor cross-section. Simultaneously, selecting an even number of turns helps ensure the symmetry of the current in the windings, which is crucial for maintaining a stable electromagnetic field. It also simplifies harmonic analysis because in AC circuits, odd-order harmonic currents cancel each other out in even-numbered turns, thus reducing harmonic distortion and improving system efficiency and reliability.

[0045] In a further embodiment, the low-voltage winding 21 is arranged away from the slot bottom and close to the slot opening, while the high-voltage winding 22 is arranged close to the slot bottom and away from the slot opening. This configuration allows the low-voltage winding 21 to make better use of space and reduce coupling losses with the core, while the high-voltage winding 22, due to its high-voltage characteristics, is placed in a more insulated position to ensure safety and reduce leakage flux. Furthermore, this arrangement also helps improve cooling, as the heat dissipated by the low-voltage winding 21 is more easily dissipated through the slot opening.

[0046] In an embodiment not shown, the high-voltage winding 22 is arranged away from the slot bottom and close to the slot opening, while the low-voltage winding 21 is arranged close to the slot bottom and away from the slot opening. This design is suitable for situations where heat dissipation requirements for the high-voltage winding are higher, or where, under specific mechanical constraints, priority must be given to the insulation strength and leakage flux control of the low-voltage winding. By placing the high-voltage winding 22 at the slot opening, it can be directly exposed to the cooling medium, such as oil, air, or other coolant, thereby improving its heat dissipation capacity. The low-voltage winding 21, located deeper in the slot, increases the distance from the core, further reducing coupling losses, while providing additional insulation protection against electrical faults such as arcing.

[0047] In a preferred embodiment, the first sub-winding 211, the second sub-winding 212, the third sub-winding 221, and the fourth sub-winding 222 are made of wires of the same specification and have the same insulation characteristics, and the pitch of the first sub-winding 211, the second sub-winding 212, the third sub-winding 221, and the fourth sub-winding 222 is the same. The first sub-winding 211, the second sub-winding 212, the third sub-winding 221, and the fourth sub-winding 222 are formed separately before being installed in the stator slots.

[0048] All four sub-windings are designed to be wound with wires of the same specification. Consistent wire specifications refer to identical conductor diameter / cross-sectional area, conductor material, and conductor shape. The use of consistent wire specifications aims to ensure uniform current distribution among the windings, avoiding electromagnetic imbalance caused by differences in wire diameter, thereby improving the overall performance of the device. In this invention, pitch refers to the distance between two effective sides of a winding on the motor stator, usually expressed as the number of slots spanned. Furthermore, using the same pitch effectively controls the distribution of magnetic flux density, reduces eddy current losses, and improves electromagnetic conversion efficiency. In this paper, identical insulation characteristics of the four winding layers refer to the inherent properties of the insulation components of each of the four winding layers, such as identical insulation material, structure, and thickness. Having identical insulation characteristics for the four winding layers simplifies quality control during production, reduces the risk of failures caused by inconsistent insulation, and extends the service life of the equipment.

[0049] Furthermore, the stator winding 20 also includes an adjusting shim 25, a slot shim 26, and magnetic slot filler 27. The adjusting shim 25 is disposed between the low-voltage winding 21 and the slot opening of the stator slot. The slot shim 26 is disposed between the adjusting shim 25 and the slot opening. The magnetic slot filler 27 is disposed at the slot opening and fills the space between the slot opening and the slot shim 27.

[0050] This precise spacing not only helps prevent direct contact between the windings and the core, avoiding electrical short circuits, but also promotes heat dissipation during operation, reducing the impact of thermal stress on the windings and thus extending the motor's service life. Simultaneously, filling the slots with magnetic slot filler reduces excitation current and core losses, improving the power factor.

[0051] See Figure 3 It shows a cross-sectional view of the stator core of a high-voltage motor equipped with stator windings according to an embodiment of the present invention. Figure 3 The diagram shows a stator comprising a stator core 10, stator ribs 14, stator ventilation ducts 15, and high-voltage windings 22 and low-voltage windings 21. A stator core 10 with stator windings is formed by winding the high-voltage windings 22 and the low-voltage windings 21 into the stator slots of the stator core 10.

[0052] Furthermore, the high-voltage winding 22 is connected to the first terminal in the main junction box and, via the first terminal, to the high-voltage power supply. Simultaneously, the low-voltage winding 21 is connected to the second terminal in the starting junction box and, via the second terminal, to the low-voltage power supply. The main junction box and the starting junction box are separately located on the outer surface of the high-voltage motor housing. The high-voltage and low-voltage windings respectively fulfill different electrical functions and connection requirements; this design reflects the high flexibility and safety of the motor within the power system.

[0053] Specifically, the high-voltage winding 22 is designed to withstand and transmit high-voltage electrical energy and is directly connected to the first terminal in the main junction box outside the motor housing. This connection method ensures a stable input of high-voltage electrical energy, while effectively avoiding potential threats to internal motor components and operators from high voltage through the protection and isolation provided by the main junction box.

[0054] The low-voltage winding 21, as a key component for motor starting and control, is connected to the second terminal block inside the starting junction box. The starting junction box is also located outside the motor housing. This design not only facilitates the connection of the low-voltage power supply but also ensures efficient and safe power transmission during motor starting through precise connection of the second terminal block. The independent junction box design for the low-voltage winding 21 also facilitates motor maintenance and inspection, reducing the failure rate caused by electrical connection problems.

[0055] In a preferred embodiment, the rated operating voltage of the high-voltage motor is 10kV or 11kV. The number of turns of the first and second sub-windings of the low-voltage winding 21 is only 1, which is sufficient to meet the magnetic field requirements. The low-voltage winding 21, which consists of a single-turn sub-winding, is connected to a low-voltage frequency converter to help the high-voltage motor to perform soft start. When the high-voltage motor reaches a certain speed under no-load operation, such as 90% of the rated speed, it can be switched back to the main junction box to connect to the high-voltage power supply to achieve the rated operating state of the high-voltage motor.

[0056] Figure 4 A cross-sectional view of a high-voltage motor having a stator core and rotor windings according to an embodiment of the present invention is shown. Figure 4 In, such as Figure 3 The stator core 10, which is equipped with stator winding 20, is arranged inside the housing 30, surrounding the rotor shaft 40 and rotor winding 41, and a gap is provided between the stator winding 20 and the rotor winding 41.

[0057] The technical advantages of this invention are as follows: The stator of this high-voltage motor, with its low-voltage winding 21 (different from the high-voltage winding 22) in the stator windings, allows for the gradual increase of output frequency and voltage using a frequency converter, enabling the high-voltage motor to accelerate gradually from low speed. In particular, this design allows for the use of inexpensive low-voltage frequency converters to assist in the soft-start of the high-voltage motor. Furthermore, the high-voltage motor does not experience a stall phase during soft starting, resulting in less temperature rise in the rotor bars and avoiding the large current surge during direct starting. This protects the power grid and motor equipment, reduces the failure rate, and allows for multiple consecutive hot starts under special operating conditions. Simultaneously, the stator of this invention employs a winding design with conductor transposition, saving slot space for single-turn windings. The use of magnetic slot filler reduces excitation current and core losses, improving the power factor. The newly added single-turn winding can also be considered a magnetic slot wedge, having almost no impact on the motor's rated performance.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stator for a high-voltage motor, characterized in that, The stator includes: Stator core (10), including stator slots (11); and A stator winding (20) is disposed in the stator slot (11), wherein the stator winding (20) comprises: A low-voltage winding (21) is embedded in the stator slot as a shaped winding, wherein the low-voltage winding (21) is electrically connected to a low-voltage power supply and configured to receive power from the low-voltage power supply to start the high-voltage motor; and The high-voltage winding (22) is embedded in the stator slot in a shaped winding manner, wherein the high-voltage winding (22) is stacked with the low-voltage winding (21) in the mounting direction from the bottom (12) of the stator slot (11) to the opening (13), and is electrically connected to the high-voltage power supply and configured to receive power from the high-voltage power supply to enable the high-voltage motor to operate in the rated operating state.

2. The stator for a high-voltage motor according to claim 1, characterized in that, The low-voltage winding is connected to the low-voltage power supply via a low-voltage frequency converter, wherein the power from the low-voltage power supply is converted by the low-voltage frequency converter into a voltage with a gradually increasing frequency and supplied to the low-voltage winding.

3. The stator for a high-voltage motor according to claim 1, characterized in that, The low-voltage winding (21) includes a first sub-winding (211) and a second sub-winding (212), which are stacked in the mounting direction. The stator winding also includes a first spacer (23), which is disposed between the low-voltage winding (21) and the high-voltage winding (22).

4. The stator for a high-voltage motor according to claim 3, characterized in that, Both the first sub-winding (211) and the second sub-winding (212) adopt a double-wire parallel winding structure, and the number of turns of both the first sub-winding (211) and the second sub-winding (212) is one.

5. The stator for a high-voltage motor according to claim 3, characterized in that, The high-voltage winding (22) includes a third sub-winding (221) and a fourth sub-winding (222), which are stacked in the mounting direction. The stator winding also includes a second spacer (24) disposed between the third sub-winding (221) and the fourth sub-winding (222).

6. The stator for a high-voltage motor according to claim 5, characterized in that, Both the third sub-winding (221) and the fourth sub-winding (222) adopt a conductor transposition structure, and the number of turns of both the third sub-winding (221) and the fourth sub-winding (222) is even.

7. The stator for a high-voltage motor according to claim 5, characterized in that, The first sub-winding (211), the second sub-winding (212), the third sub-winding (221), and the fourth sub-winding (222) are made of wires of the same specification and have the same insulation characteristics, and the first sub-winding (211), the second sub-winding (212), the third sub-winding (221), and the fourth sub-winding (222) have the same pitch.

8. The stator for a high-voltage motor according to claim 1, characterized in that, The stator winding (20) also includes: Adjusting shims (25) are placed between the low-voltage winding (21) and the slot opening (13) of the stator slot; A slotted shim (26) is disposed between the adjusting shim (25) and the slot (13); and Magnetic groove mud (27) is provided at the groove opening (13) and fills the space between the groove opening (13) and the groove opening pad (26).

9. A high-voltage motor, characterized in that, The high-voltage motor includes: case; The stator for a high-voltage motor according to any one of claims 1-8 is disposed within the housing; A main junction box is disposed on the outer surface of the housing, wherein the high-voltage winding is connected to a first terminal within the main junction box and connected to the high-voltage power supply via the first terminal; and A starter junction box is disposed on the outer surface of the housing and is separate from the main junction box. The low-voltage winding is connected to a second terminal inside the starter junction box and is connected to the low-voltage power supply via the second terminal.

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