Stator core structure of main generator of locomotive

Abstract

The invention discloses a locomotive main generator stator iron core structure which comprises a laminated iron core (1), pull plate fixing grooves (9) are evenly distributed in the peripheral face of the laminated iron core (1) in the axial direction, and ventilation grooves (10) are formed between the adjacent pull plate fixing grooves (9) in the axial direction. A pulling plate (8) is mounted in the pulling plate fixing groove (9); annular end plates (5) are arranged on the two sides of the laminated iron core (1), and the two ends of the pulling plate (8) are welded to the corresponding annular end plates (5) respectively. Iron core ventilation holes (11) are evenly distributed in the yoke portion of the laminated iron core (1) along the circumference, and end plate ventilation holes (12) are correspondingly formed in the annular end plates (5). According to the novel layout of the iron core yoke ventilating duct, on the premise that the magnetic conduction function of the iron core punching sheet is met, the heat dissipation area of the iron core ventilating duct is increased, the heat dissipation efficiency of the motor iron core is improved, and the material utilization rate of the iron core punching sheet is improved to the maximum extent.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, relates to stator heat dissipation, and specifically is a stator core structure of a locomotive main generator. Background Art

[0002] In recent years, the operating environment of diesel locomotives has become more complex. The locomotive main generator, which uses air cooling and heat dissipation, faces a huge challenge in terms of motor temperature rise due to long-term operation in a high-temperature environment. The armature winding of the existing locomotive main generator is the main heat-generating component of the motor. Excessive temperature rise will not only shorten the insulation life, but may even cause the motor to fail due to short circuit. Therefore, it is necessary to improve the ventilation and heat dissipation capacity of the motor stator core while ensuring the motor installation structure and performance.

[0003] The existing main generator stator core structure, such as Figures 1 to 4 As shown, the stator laminated core 1 is formed by laminating core punching sheets 2 (each punching sheet 2 is composed of nine sector-shaped punching sheets 3, that is, 9 sector-shaped punching sheets 3 are evenly distributed around the circumference to form a full-circle punching sheet 2), and then 18 screws 4 are passed through the laminated core 1 and the annular end plates 5 at both ends and locked with nuts 6. After the overall lamination and locking are completed, the main generator frame 7 is thermally sleeved on the laminated core 1. The punching sheet 2 is designed with two rows of core ventilation holes 11 on the inner and outer circles, and the outer circle is designed with evenly distributed screw mounting holes.

[0004] The disadvantages of the existing main generator stator core structure are as follows: 1) Two rows of circular ventilation holes are designed on the yoke of the core punching sheet, which reduces the effective magnetic permeability of the punching sheet yoke, seriously affects the magnetic field distribution of the yoke, and the space material utilization rate of the punching sheet yoke is low.

[0005] 2) The core yoke ventilation duct is designed in the shape of a circular hole. Although this can slow down the change in the yoke magnetic resistance, the surface heat dissipation area of ​​the circular channel is the smallest when the cross-sectional area of ​​the ventilation duct is the same, which reduces the heat dissipation efficiency.

[0006] 3) After the core is laminated, the screw is tightened by passing it through some ventilation holes. During the operation of the motor, the screw is repeatedly magnetized by the magnetic field of the core yoke. When the magnetic density design value of the motor yoke is high, it will cause the pull rod to heat up. In order to prevent the screw from connecting the adjacent layers of the core punching and causing eddy current heating, the surface of the screw needs to be wrapped with insulating material, resulting in a more complicated structure. Summary of the invention

[0007] The purpose of the present invention is to propose a novel stator core stacking tensioning and ventilation cooling structure, which achieves the purpose of reducing the temperature rise of the generator winding by innovatively arranging the stator core ventilation duct, stacking method and base structure.

[0008] The present invention is achieved by adopting the following technical solutions: A locomotive main generator stator core structure includes a laminated core, wherein the outer peripheral surface of the laminated core is uniformly provided with pull plate fixing grooves along the axial direction, and ventilation grooves are arranged axially between adjacent pull plate fixing grooves; pull plates are installed in the pull plate fixing grooves; annular end plates are provided on both sides of the laminated core, and the two ends of the pull plates are respectively welded to the corresponding annular end plates.

[0009] The present invention is a brand-new main generator stator sector sheet structure and stator core stacking tensioning and ventilation cooling structure. The armature core sector sheet is redesigned, a rectangular groove is designed on the outer surface of the sheet, a rectangular ventilation hole is formed between the outer circle of the core and the base, and a rectangular pull plate is designed to be welded and connected to both ends of the core for core tensioning.

[0010] Further preferably, the yoke of the laminated core is uniformly provided with core ventilation holes along the circumference, and the annular end plate is also provided with end plate ventilation holes corresponding to the core ventilation holes one by one, with the same area and shape, and generally circular. The yoke of the laminated core is provided with a single row of core ventilation holes. The core punching sheet changes the two rows of circular ventilation holes into a single row of ventilation holes, which saves the height dimension of the yoke and reduces the magnetic resistance of the punching sheet yoke. The number and position of the ventilation holes correspond to the distribution of the armature coil slots to ensure the heat dissipation efficiency.

[0011] Further preferably, the ventilation slots are arranged alternately with the core ventilation holes. The outer circle of the stator punching sheet is designed as a rectangular ventilation slot structure, which is arranged alternately with the core ventilation holes. The core ventilation holes have a larger heat dissipation surface area and a better heat dissipation effect when the cross section is the same as the circular ventilation holes. The positions of the core ventilation holes and ventilation slots can be adjusted according to the temperature rise of the motor and the temperature of the cooling air.

[0012] Further preferably, an annular groove is provided on the inner side of the annular end plate. The groove is designed on the annular end plate to prevent the end plate from being deformed due to force, which causes insufficient clamping force on the inner ring, so as to solve the hidden danger of loosening of the stator core.

[0013] Further preferably, the laminated core is formed by laminating punching sheets, which are formed by splicing nine fan-shaped punching sheets, and adjacent fan-shaped punching sheets form complete pull plate fixing grooves at the splicing positions, and of course, complete pull plate fixing grooves are also arranged on the fan-shaped punching sheets.

[0014] Further preferably, the cross-sectional shape of the ventilation slot is rectangular; and the cross-sectional shape of the pull plate fixing slot is rectangular.

[0015] Further preferably, a main generator frame is thermally sleeved outside the laminated core, and heat dissipation fins are arranged outside the main generator frame.

[0016] Compared with the prior art, the technical solution of the present invention has the following advantages: (1) The laminated core of the present invention adopts a single row of circular ventilation holes and a rectangular ventilation duct design on the outer surface, which increases the ventilation and heat dissipation surface area and improves the heat dissipation efficiency.

[0017] (2) The armature core punching yoke of the present invention is configured with a single row of circular ventilation holes. Compared with the double row of circular ventilation holes, the magnetic field distribution of the yoke is improved and the actual utilization rate of the punching yoke is increased.

[0018] (3) The present invention uses a pull plate to tighten the core in the outer rectangular groove after the core is stacked, and the structure is simpler. Since the magnetic density and heat generation on the outer surface of the armature core are very small, there is no need to insulate the pull plate, which is easy to assemble, shortens the production cycle, and reduces manufacturing costs.

[0019] (4) The present invention combines cooling by the punching ventilation holes of the integral stator design with cooling by the ventilation slots between the base and the core. The best cooling effect can be achieved by adjusting the distribution of the ventilation holes and ventilation slots.

[0020] The invention has reasonable design and good practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 The figure shows the front view of the existing stator core structure.

[0024] Figure 2 express Figure 1 AA section view.

[0025] Figure 3 express Figure 2 BB cross-sectional view.

[0026] Figure 4 A schematic diagram of the existing fan-shaped punching structure is shown.

[0027] Figure 5 A schematic diagram of the stator core structure of the present invention is shown.

[0028] Figure 6 express Figure 5 AA section view.

[0029] Figure 7express Figure 5 Enlarged schematic diagram of middle part Ⅰ.

[0030] Figure 8 express Figure 6 Enlarged schematic diagram of the middle part II.

[0031] Fig. 9 A schematic diagram of the punching structure of the present invention is shown.

[0032] Fig.10 A schematic diagram of the fan-shaped punching sheet structure of the present invention is shown.

[0033] Fig.11 A front view of the core stator structure of the present invention is shown.

[0034] Fig.12 express Fig.11 Side view of.

[0035] Fig.13 express Fig.12 BB cross-sectional view.

[0036] Fig.14 A schematic diagram showing the overall structure of the core stator of the present invention.

[0037] In the figure: 1-laminated core, 2-punch, 3-fan-shaped punch, 4-screw, 5-annular end plate, 6-nut, 7-main generator base, 8-pull plate, 9-pull plate fixing groove, 10-ventilation groove, 11-core ventilation hole, 12-end plate ventilation hole, 13-annular groove, 14-pull rod, 15-heat dissipation fin, 16-weld. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0039] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0041] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] The present invention designs a new layout of the ventilation duct of the core yoke, which increases the heat dissipation area of ​​the core ventilation duct while meeting the magnetic conductivity function of the core punching sheet, improves the heat dissipation efficiency of the motor core, and maximizes the utilization rate of the core punching sheet material.

[0043] The present invention designs a new iron core punching sheet stacking and tensioning structure, which solves the heating problem of the pull rod and satisfies the iron core stacking and tensioning effect without affecting the ventilation and heat dissipation of the punching sheets and the magnetic field distribution of the yoke.

[0044] The invention improves the structure of the end plates at both ends of the core to solve the quality problems such as loose punching sheets and large gaps caused by uneven pressing force of the core.

[0045] A locomotive main generator stator core structure is a new main generator stator sector structure and a stator core stacking tensioning and ventilation cooling structure, such as Figures 11 to 13 As shown, it includes a laminated core 1, which is formed by laminating punching sheets 2. Each punching sheet 2 is composed of nine fan-shaped punching sheets 3. Adjacent fan-shaped punching sheets 3 form a complete pull plate fixing groove 9 at the joint. Fig. 9 and Fig.10 As shown. The outer peripheral surface of the laminated core 1 is uniformly distributed with pull plate fixing grooves 9 along the axial direction, and ventilation grooves 10 are arranged axially between adjacent pull plate fixing grooves 9; the cross-sectional shape of the ventilation grooves 10 is rectangular; the cross-sectional shape of the pull plate fixing grooves 9 is rectangular. Fig.14 As shown, a pull plate 8 is installed in the pull plate fixing groove 9; an annular end plate 5 is provided on both sides of the laminated core 1, and both ends of the pull plate 8 are respectively welded to the corresponding annular end plate 5, as shown in FIG. Figure 6 and Figure 8 shown.

[0046] like Figure 6 and Fig.12 As shown, the yoke of the laminated core 1 is evenly distributed with core ventilation holes 11 along the circumference, and the annular end plate 5 is also correspondingly provided with end plate ventilation holes 12. Fig.13 As shown, a single row of core ventilation holes is provided on the yoke of the laminated core 1. The ventilation slots 10 and the core ventilation holes 11 may also be arranged alternately.

[0047] like Figure 8 As shown, an annular groove 13 is provided on the inner side of the annular end plate 5 to ensure the pressing force of the inner ring of the core.

[0048] like Figure 5 and Figure 6 As shown, the laminated core 1 is thermally sleeved with a main generator frame 7. The main generator frame 7 is provided with heat dissipation fins 15 on the outside.

[0049] The key technical point of the present invention is to design a new structure of the main generator stator, with a row of circular ventilation holes in the middle of the fan-shaped punching sheet, a fan-shaped ventilation duct on the outer circle, and an outer circle pull plate welded and fixed after the core is stacked. The first is to use a fan-shaped punching sheet structure with a single row of circular ventilation holes and an outer circle rectangular ventilation slot, and a high material utilization rate of the punching sheet yoke; the second is to use a fixed pull plate located on the outer circle of the core, and a stator laminated core structure with very small magnetic density and heat generation; the third is to use a motor stator laminated core structure that is fixed on the outer circle of the core using a rectangular pull plate welded on the end plate; the fourth is a stator core pressure plate structure with a groove on the inner side of the end plate to ensure the clamping force of the inner ring of the core; the fifth is a stator core structure in which the circular ventilation duct of the core and the ventilation slot between the core and the base can cool and dissipate heat at the same time. The sixth is a stator core heat dissipation method that can adjust the number, size and distribution of ventilation holes and ventilation ducts according to the armature temperature and ambient temperature to optimize the heat dissipation effect.

[0050] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A locomotive main generator stator core structure, comprising a laminated core (1), characterized in that: The outer peripheral surface of the laminated core (1) is uniformly provided with pull plate fixing grooves (9) along the axial direction, and ventilation grooves (10) are arranged along the axial direction between adjacent pull plate fixing grooves (9); a pull plate (8) is installed in the pull plate fixing groove (9); annular end plates (5) are provided on both sides of the laminated core (1), and both ends of the pull plate (8) are respectively welded to the corresponding annular end plates (5).

2. The locomotive main generator stator core structure according to claim 1, characterized in that: The yoke of the laminated core (1) is evenly distributed with core ventilation holes (11) along the circumference, and the annular end plate (5) is also correspondingly provided with end plate ventilation holes (12).

3. A locomotive main generator stator core structure according to claim 1 or 2, characterized in that: The ventilation slots (10) and the iron core ventilation holes (11) are arranged in a staggered manner.

4. The locomotive main generator stator core structure according to claim 3, characterized in that: An annular groove (13) is provided on the inner side surface of the annular end plate (5).

5. The locomotive main generator stator core structure according to claim 4, characterized in that: The laminated core (1) is formed by laminating punching sheets (2).

6. The locomotive main generator stator core structure according to claim 5, characterized in that: The punching sheet (2) is composed of nine fan-shaped punching sheets (3), and adjacent fan-shaped punching sheets (3) form a complete pull plate fixing groove (9) at the joint.

7. The locomotive main generator stator core structure according to claim 6, characterized in that: The laminated iron core (1) is thermally sleeved with a main generator frame (7).

8. The locomotive main generator stator core structure according to claim 2, characterized in that: The yoke of the laminated iron core (1) is provided with a single row of iron core ventilation holes.

9. The locomotive main generator stator core structure according to claim 1, characterized in that: The cross-sectional shape of the ventilation slot (10) is rectangular; the cross-sectional shape of the pull plate fixing slot (9) is rectangular.

10. The locomotive main generator stator core structure according to claim 7, characterized in that: The main generator base (7) is provided with heat dissipation fins (15) outside.

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