Universal stator end structure

Abstract

The invention relates to a universal stator end structure which comprises a stator iron core and pressing rings connected with the two ends in the axis direction of the stator iron core. Wherein the outer surface of the pressing ring is covered with a copper shielding assembly so as to weaken a leakage magnetic field at the end part of the pressing ring. The beneficial effects of the invention are that the combined structure design of the copper shielding assembly and the magnetic shielding member enables the end structure to be good in ventilation effect, safe and reliable, and wide in application; moreover, the structure and position design of the copper shielding assembly can effectively weaken the leakage magnetic field entering the end part of the pressing ring, reduce the eddy current loss induced by the leakage magnetic field at the end part in the copper shielding assembly, and reduce the temperature rise at the end part of the stator, thereby improving the reliability of the phase modifier.

Description

Technical Field

[0001] The invention relates to the technical field of electric power systems, in particular to a universal stator end structure. Background Art

[0002] It has become a consensus at home and abroad to vigorously develop multiple energy sources such as wind power and photovoltaic power generation. The large-scale centralized development of wind power and photovoltaic power, and their extension to remote areas, requires the use of high-voltage DC power grid transmission, DC transmission, and no reactive power transmission. In this process, rectification and inversion need to absorb a large amount of reactive power, and the load is mostly electric motors, which also need to absorb a large amount of reactive power. Moreover, these new energy sources have weak tolerance to frequency and voltage, and cannot perform reactive power regulation, and do not participate in frequency and voltage regulation. When the internal pressure, frequency, and load fluctuations of the system suddenly change, it is easy to cause interlocking disconnection from the grid, causing the system to collapse. Therefore, insufficient reactive power compensation directly affects the long-distance transmission of new energy and affects the absorption capacity of new energy;

[0003] Phase condensers are known as the "voltage stabilizers" of power grids, and can perfectly solve the problem of transient overvoltage at the power supply end. Synchronous phase condensers are excellent dynamic reactive power compensation devices that can make full use of their secondary transient, transient and steady-state characteristics, and have excellent dynamic reactive power characteristics. They can improve the anti-interference performance of long-distance transmission of new energy, increase the positive force on the system, and enhance the UHV DC transmission capacity. Phase condensers can provide large-capacity dynamic reactive power output, and have the characteristics of strong overload capacity, good economy, and long service life. Compared with other reactive power compensation devices, they have more significant advantages and are the preferred reactive power compensation equipment for large power grids.

[0004] The high stator current of the condenser during rated operation will generate dense magnetic leakage at the end, which will induce eddy currents in the conductive structural parts at the end, causing the end structural parts to heat up. How to improve the heat dissipation efficiency of the condenser and reduce the hottest area of ​​the condenser under the constraints of limited space has become a key issue that needs to be solved in the current heating and cooling of the condenser. Summary of the invention

[0005] The present invention aims at the technical problems existing in the prior art and provides a universal stator end structure, which has good ventilation and cooling effect, high safety and reliability, and wide application range.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A universal stator end structure comprises a stator core and a pressing ring connected at both ends along the axis direction of the stator core;

[0008] Wherein, the outer surface of the pressing ring is covered with a copper shielding component to weaken the leakage magnetic field at the end of the pressing ring.

[0009] As a further technical solution: the copper shielding assembly includes a first copper shielding member, and a second copper shielding member connected to the first copper shielding member by bolts;

[0010] The first copper shielding member covers the side of the pressing ring away from the stator core, and the second copper shielding member is provided in a plurality and arranged at intervals along the circumference of the pressing ring to reduce the eddy current loss induced in the copper shielding assembly by the end leakage magnetic field;

[0011] The gap between the first copper shielding member and the second copper shielding member constitutes a copper shielding outer air duct, and the gap between the first copper shielding member and the pressing ring constitutes a copper shielding inner air duct.

[0012] As a further technical solution: the cross-section of the second copper shielding member is constructed in a 7-shape, and the short side of the 7-shape is arranged on the side of the pressure ring away from the stator core to be connected with the first copper shielding bolt gap, and the long side is arranged along the circumference of the pressure ring and connected with its bolt gap.

[0013] As a further technical solution: further comprising a magnetic shielding member disposed between the pressing ring and the stator core;

[0014] Among them, the magnetic shielding component is arranged between the far core side pressure finger and the near core side pressure finger in the stator core, the side of the far core side pressure finger away from the magnetic shielding component is adaptably connected to the pressure ring, the side of the near core side pressure finger away from the magnetic shielding component is adaptably connected to the stator core, and the magnetic shielding component is covered in the copper shielding assembly.

[0015] As a further technical solution: the pressure ring includes a ring-shaped body, and a ring-shaped connector arranged vertically and concentrically to the ring-shaped body, the ring-shaped body is divided into an inner area and an outer area by the ring-shaped connector, and the first copper shielding member and the second copper shielding member cover the inner area and the outer area respectively;

[0016] Wherein, the a surface, b surface, c surface and d surface on the first copper shielding member respectively cover the a' surface, b' surface, c' surface and d' surface in the inner area, and the cross section of the second copper shielding member is a 7-shaped cross section, and the gap between the long sides of the 7-shaped cross section covers the far core side pressure finger and the magnetic shielding member;

[0017] The end of the surface where the short side of the 7-shaped part is located is connected to the reverse surface of the first copper shielding surface d through a screw gap.

[0018] As a further technical solution: the cross-section of the outer area of ​​the ring-shaped body is Z-shaped and is covered by the gap of the second copper shielding member.

[0019] As a further technical solution: the remote core side pressure finger comprises a tooth pressure plate and a plurality of first tooth pressure strips welded at intervals along a side of the tooth pressure plate facing the pressure ring, and the gaps between adjacent first tooth pressure strips constitute a small pressure finger air duct;

[0020] Wherein, the tooth pressure plate is circular in shape, and its inner diameter is larger than the inner diameter of the stator core, and its outer diameter is equal to the outer diameter of the stator core.

[0021] As a further technical solution: the near-core side pressure finger comprises a ring-shaped plate and a plurality of second tooth pressure strips, wherein the plurality of second tooth pressure strips are arranged on a side of the ring-shaped plate facing the pressure ring and are arranged at intervals along the circumferential direction of the ring-shaped plate;

[0022] A plurality of ventilation slots are provided on the ring-shaped plate along the circumferential direction thereof, and a second tooth strip is provided between adjacent ventilation slots, so that the gaps between adjacent second tooth strips and the ventilation slots form a large pressure finger air duct;

[0023] The inner diameter and outer diameter of the ring-shaped plate are respectively equal to the inner diameter and outer diameter of the stator core.

[0024] As a further technical solution: the inner diameter of the ventilation groove is equal to the inner diameter of the ring-shaped plate, and the outer diameter is smaller than the outer diameter of the ring-shaped plate.

[0025] As a further technical solution: Insulating pads are provided at the bolted connections between the second copper shielding member, the first copper shielding member and the pressure ring.

[0026] The beneficial effects of the present invention are as follows: the combined structural design of the copper shielding assembly and the magnetic shielding member makes the end structure have good ventilation effect, is safe and reliable, and is widely applicable;

[0027] Furthermore, the structure and position design of the copper shielding assembly can effectively weaken the leakage magnetic field entering the end of the pressure ring, reduce the eddy current loss induced by the end leakage magnetic field in the copper shielding assembly, and reduce the temperature rise of the stator end, thereby improving the reliability of the phase regulator;

[0028] Finally, the present invention has a simple structure, is practical and effective, and therefore has very strong applicability and can be used in most phase regulators, and only requires adaptive modification of some structural dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic diagram of a universal stator end structure of the present invention;

[0030] Figure 2 It is a partial structural schematic diagram of a universal stator end structure of the present invention, wherein at least a part of the second copper shielding member is removed;

[0031] Figure 3 for Figure 2 A partial structural schematic diagram of the invention, wherein the first copper shielding member is removed;

[0032] Figure 4 It is a partially enlarged structural schematic diagram of a universal stator end structure of the present invention, wherein at least the pressing ring and the copper shielding component are removed;

[0033] Figure 5 is a schematic diagram of the three-dimensional structure of the first copper shielding member;

[0034] Figure 6 Schematic diagram of the three-dimensional structure of the pressing ring;

[0035] Figure 7 is a schematic diagram of the three-dimensional structure of the second copper shielding member;

[0036] Figure 8 It is a structural schematic diagram of the pressure finger near the core;

[0037] Fig. 9 This is a schematic diagram of the structure of the remote core side pressure finger;

[0038] Fig.10 It is a schematic diagram of a cross-section of a general stator end structure of the present invention, wherein the direction of the arrow indicates the direction of movement of the cold air;

[0039] Fig.11 for Fig.10 Schematic diagram of the enlarged structure of part A in the middle.

[0040] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0041] Stator core 1;

[0042] Pressing ring 2, ring-shaped body 21, ring-shaped connecting body 22;

[0043] Copper shielding assembly 3, first copper shielding member 31, second copper shielding member 32;

[0044] Stator coil 4, magnetic shielding member 5;

[0045] Far core side pressure finger 6, tooth pressure piece 61, first tooth pressure strip 62;

[0046] The core-side pressure finger 7 , the ring-shaped plate 71 , the ventilation slot 711 , and the second tooth pressure strip 72 . DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0048] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0049] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any technician in the field to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details to obscure the description of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0050] Since the stator end has a complex structure, large wind resistance, and concentrated heat, in order to improve the reliability of the phase regulator, reduce costs, and save raw materials, this embodiment provides a universal stator end structure, which weakens the leakage magnetic field entering the end by designing a separate air duct, that is, a double-path ventilation structure, reduces the eddy current loss of the end leakage magnetic field, and reduces the temperature rise of the stator end; see Figure 1-Figure 3 , Fig.10 , specifically including a stator core 1, and a pressure ring 2 connected at both ends along the axial direction of the stator core 1; wherein, the outer surface of the pressure ring 2 is covered with a copper shielding component 3, which increases the air volume and the heat dissipation surface, thereby weakening the leakage magnetic field at the end of the pressure ring 2; the copper shielding component 3 covers most of the outer area of ​​the pressure ring 2, so as to better weaken the leakage magnetic field entering the end of the pressure ring 2, and the material of the copper shielding component 3 is the same as the original copper windshield on the stator core 1; the stator core 1 is also provided with a plurality of stator coils 4, and each stator coil 4 is correspondingly inserted into a ventilation slot on the stator core 1.

[0051] In the specific implementation process, see Figure 2 , Figure 3 , Fig.10 , Fig.11 The copper shielding assembly 3 includes a first copper shielding member 31 and a second copper shielding member 32 connected to the first copper shielding member 31 by bolts; the first copper shielding member 31 covers the side of the pressure ring 2 away from the stator core 1, and the second copper shielding member 32 is provided with a plurality of them and is arranged at intervals along the circumference of the pressure ring 2 to reduce the eddy current loss induced by the end leakage magnetic field in the copper shielding assembly 3; wherein the gap between the first copper shielding member 31 and the second copper shielding member 32 constitutes a copper shielding outer air duct, and the gap between the first copper shielding member 31 and the pressure ring 2 constitutes a copper shielding inner air duct, that is, inner and outer high-speed air ducts are formed, which increases the air volume and the heat dissipation surface;

[0052] For more details, see Figure 2 , Figure 7 The cross-section of the second copper shielding member 32 is of a 7-shape, and the short side of the 7-shape is arranged on the side of the pressure ring 2 away from the stator core 1 to be connected with the first copper shielding member 31 by a bolt gap, and the long side is arranged circumferentially along the pressure ring 2 and connected with its bolt gap; in order to avoid the occurrence of corona at the coil end, the second copper shielding member 32 and the first copper shielding member 31 and the pressure ring 2 are provided with insulating pads (not shown in the figure) at the bolt connections.

[0053] In the specific implementation process, see Figure 4 , Fig.10 , Fig.11 The end structure also includes a magnetic shielding member 5 arranged between the pressure ring 2 and the stator core 1; wherein the magnetic shielding member 5 is arranged between the far core side pressure finger 6 and the near core side pressure finger 7 in the stator core 1, the far core side pressure finger 6 is adapted to be connected with the pressure ring 2 on the side away from the magnetic shielding member 5, the near core side pressure finger 7 is adapted to be connected with the stator core 1 on the side away from the magnetic shielding member 5, and the magnetic shielding member 5 is covered in the copper shielding assembly 3, so that the cold air passes through After the fan is pressurized, it enters the motor, and part of the cold air enters the air gap and flows radially through the air duct of the stator core 1 and the large pressure finger air duct where the near core side pressure finger 7 is located. Part of the cold air flows through the end of the stator coil 4 through the magnetic shielding component 5, the small pressure finger air duct where the far core side pressure finger 6 is located, and the inner and outer air ducts of the copper shielding component 3, and finally carries the heat of the end structure to the back of the stator core 1, dissipates the heat through the cooler, and then enters the motor again after being pressurized by the fan;

[0054] It can be explained that the far core side pressure finger 6 and the near core side pressure finger 7 are arranged along the thickness direction of the stator core 1 (i.e. Figure 1Here, the far core side pressure finger 6 and the near core side pressure finger 7 both have the function of increasing the heat dissipation surface inside the motor and increasing the air volume.

[0055] In the specific implementation process, see Figure 2 , Figure 3 , Figure 6 The pressing ring 2 includes a ring-shaped body 21, and a ring-shaped connecting body 22 arranged vertically and concentrically with the ring-shaped body 21, the ring-shaped body 21 is divided into an inner area and an outer area by the ring-shaped connecting body 22, and the first copper shielding member 31 and the second copper shielding member 32 cover the inner area and the outer area respectively; wherein, reference Figure 5 , Figure 6 , the a surface, b surface, c surface, and d surface of the first copper shielding member 31 respectively cover the a' surface, b' surface, c' surface, and d' surface in the inner area, and the cross section of the second copper shielding member 32 is a 7-shaped (such as Figure 7 The surface where the long side of the 7-shaped body is located has a gap covering the far core side pressure finger 6 and the magnetic shielding member 5; the end of the surface where the short side of the 7-shaped body is located is connected to the reverse surface of the first copper shielding member 31d through a screw gap; the outer section of the ring-shaped body 21 is Z-shaped (such as Figure 6 The perspective can be shown), and the second copper shielding member 32 gaps are covered to fully cover the pressure ring 2, and at the same time, the gaps of several second copper shielding members 32 are set so that the cold air converges after passing through the inner and outer air ducts respectively, thereby increasing the heating area and reducing the eddy current loss induced by the end magnetic field in the copper shielding assembly 3; that is, the second copper shielding member 32 covers the e′ surface, f′ surface, and g′ surface of the outer area of ​​the ring-shaped body 21.

[0056] In the specific implementation process, see Fig. 9 The far core side pressure finger 6 includes a tooth pressure plate 61 and a plurality of first tooth pressure strips 62 welded at circumferential intervals along one side of the tooth pressure plate 61 facing the pressure ring 2, and the gaps between adjacent first tooth pressure strips 62 constitute a small pressure finger air duct; wherein, the tooth pressure plate 61 is circular, and its inner diameter is larger than the inner diameter of the stator core 1, and its outer diameter is equal to the outer diameter of the stator core 1, so that a part of the cold air can enter from the inside of the stator core 1 and move to the back of the stator core 1 through the small pressure finger air duct where the far core side pressure finger 6 is located;

[0057] Optionally, the tooth pressure plate 61 can be designed as a circular structure formed by stacking and splicing a plurality of sector-shaped plates through positioning stirrups as required, and the formed circular structure has a slope from top to bottom (not shown in the figure);

[0058] Also, see Figure 8The near-core side pressure finger 7 includes a ring-shaped plate 71 and a plurality of second tooth pressure strips 72, wherein the plurality of second tooth pressure strips 72 are arranged on a side of the ring-shaped plate 71 facing the pressure ring 2 and are arranged at intervals along the circumferential direction of the ring-shaped plate 71; wherein the ring-shaped plate 71 is provided with a plurality of ventilation grooves 711 arranged at intervals along its circumferential direction, and a second tooth pressure strip 72 is arranged between adjacent ventilation grooves 711, so that the gaps between adjacent second tooth pressure strips 72 and the ventilation grooves 711 constitute a large pressure finger air duct ; The inner diameter of the ventilation slot 711 is equal to the inner diameter of the ring-shaped plate 71, and the outer diameter is smaller than the outer diameter of the ring-shaped plate 71; more preferably, the length of the second tooth strip 72 is greater than the length of the ventilation slot 711, and it is not exposed outside the ring-shaped plate 71; the inner diameter and outer diameter of the ring-shaped plate 71 are respectively equal to the inner diameter and outer diameter of the stator core 1, so that a part of the cold air enters from the inside of the stator core 1 and can move to the back of the stator core 1 through the large pressure finger air duct where the near-core side pressure finger 7 is located;

[0059] That is, the cold air is divided into two paths, one path enters the large pressure finger air duct and the stator core 1 air duct (both are separate air ducts), and the other path enters the small pressure finger air duct and the inner and outer air ducts of the copper shielding component 3. On the one hand, the increase of the air duct speeds up the work efficiency and increases the heat dissipation area. On the other hand, the design of the copper shielding component 3 reduces the eddy current loss of the end leakage magnetic field (see Fig.10 , Fig.11 ).

[0060] It can be explained that the near-core side pressure finger 7 is stacked on the channel steel on the stator core 1, that is, it can be welded to the channel steel (not shown in the figure), and it also has a certain supporting effect at this time; the magnetic shielding part 5 is connected to the second tooth pressure strip 72 in the near-core side pressure finger 7 on one side, and is stacked with the tooth pressure plate 61 in the far-core side pressure finger 6 on the other side, so that the pressure ring 2 is connected to the first tooth pressure strip 62 in the far-core side pressure finger 6, and an air duct for cold air to pass through is formed between adjacent first tooth pressure strips 62.

[0061] The first tooth pressure strip 62 and the second tooth pressure strip 72 have the same structure, and the side of the tooth pressure strip provided with the slope section faces the stator coil 4 .

[0062] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0063] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A universal stator end structure, characterized in that: It comprises a stator core (1) and a pressing ring (2) connected at both ends along the axis direction of the stator core (1); Wherein, the outer surface of the pressing ring (2) is covered with a copper shielding component (3) to weaken the leakage magnetic field at the end of the pressing ring (2).

2. A universal stator end structure according to claim 1, characterized in that: The copper shielding assembly (3) comprises a first copper shielding component (31) and a second copper shielding component (32) connected to the first copper shielding component (31) by bolts; The first copper shielding member (31) covers the side of the pressing ring (2) facing away from the stator core (1), and a plurality of second copper shielding members (32) are provided and arranged at intervals along the circumference of the pressing ring (2) to reduce eddy current losses induced in the copper shielding assembly (3) by the end leakage magnetic field; The gap between the first copper shielding member (31) and the second copper shielding member (32) constitutes a copper shielding outer air duct, and the gap between the first copper shielding member (31) and the pressing ring (2) constitutes a copper shielding inner air duct.

3. A universal stator end structure according to claim 2, characterized in that: The cross-section of the second copper shielding member (32) is constructed in the shape of a 7, and the short side of the 7 is arranged on the side of the pressure ring (2) away from the stator core (1) to be connected with the first copper shielding member (31) by a bolt gap, and the long side is arranged along the circumference of the pressure ring (2) and connected with its bolt gap.

4. A universal stator end structure according to claim 2, characterized in that: It also includes a magnetic shielding member (5) arranged between the pressing ring (2) and the stator core (1); The magnetic shielding component (5) is arranged between a far core side pressure finger (6) and a near core side pressure finger (7) in the stator core (1); the far core side pressure finger (6) is adapted to be connected with the pressure ring (2) on the side facing away from the magnetic shielding component (5); the near core side pressure finger (7) is adapted to be connected with the stator core (1) on the side facing away from the magnetic shielding component (5); and the magnetic shielding component (5) is covered in the copper shielding component (3).

5. A universal stator end structure according to claim 4, characterized in that: The pressing ring (2) comprises a ring-shaped body (21), and a ring-shaped connecting body (22) arranged perpendicularly to the ring-shaped body (21) and concentrically therewith, the ring-shaped body (21) is divided into an inner area and an outer area by the ring-shaped connecting body (22), and the first copper shielding member (31) and the second copper shielding member (32) cover the inner area and the outer area respectively; Wherein, the surface a, surface b, surface c and surface d on the first copper shield (31) respectively cover the surface a′, surface b′, surface c′ and surface d′ in the inner area, and the cross section of the second copper shield (32) is a 7-shaped cross section, and the gap between the long sides of the 7-shaped cross section covers the remote core side pressure finger (6) and the magnetic shield (5); The end of the surface where the short side of the 7-shaped part is located is connected to the reverse surface of the d surface of the first copper shielding member (31) through a screw gap.

6. A universal stator end structure according to claim 5, characterized in that: The cross-section of the outer area of ​​the ring-shaped body (21) is Z-shaped and is covered by the gap of the second copper shielding member (32).

7. A universal stator end structure according to claim 4, characterized in that: The remote core side pressure finger (6) comprises a tooth pressure plate (61) and a plurality of first tooth pressure strips (62) welded at circumferential intervals along a side of the tooth pressure plate (61) facing the pressure ring (2), and the gaps between adjacent first tooth pressure strips (62) form a small pressure finger air duct; The tooth pressure plate (61) is circular in shape, and its inner diameter is greater than the inner diameter of the stator core (1), and its outer diameter is equal to the outer diameter of the stator core (1).

8. A universal stator end structure according to claim 4, characterized in that: The near-core side pressure finger (7) comprises a ring-shaped plate (71) and a plurality of second tooth pressure strips (72), wherein the plurality of second tooth pressure strips (72) are arranged on a side of the ring-shaped plate (71) facing the pressure ring (2) and are arranged at intervals along the circumferential direction of the ring-shaped plate (71); The ring-shaped plate (71) is provided with a plurality of ventilation grooves (711) arranged at intervals along its circumferential direction, and a second tooth strip (72) is provided between adjacent ventilation grooves (711), so that the gaps between adjacent second tooth strips (72) and the ventilation grooves (711) form a large-pressure air duct; The inner diameter and outer diameter of the ring-shaped plate (71) are respectively equal to the inner diameter and outer diameter of the stator core (1).

9. A universal stator end structure according to claim 8, characterized in that: The inner diameter of the ventilation groove (711) is equal to the inner diameter of the ring-shaped plate (71), and the outer diameter is smaller than the outer diameter of the ring-shaped plate (71).

10. A universal stator end structure according to claim 3, characterized in that: Insulating pads are provided at the bolted connections between the second copper shielding member (32), the first copper shielding member (31) and the pressing ring (2).

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