Rotor core and turbogenerator having the same

Abstract

A rotor core and a turbo-generator with the same are characterized in that the concave and convex surfaces are formed by the side walls of rotor laminations in the same row, the distance between the concave surface and the convex surface is the difference between the distance b and the distance a, and the gap between the wire and the concave surface is the heat dissipation space of the rotor core after embedding the wire on the side wall of the rotor lamination. The heat dissipation capacity and the heat dissipation uniformity of the rotor core are greatly improved under the premise of ensuring the magnetic circuit and the strength of the rotor core, the local temperature difference of the rotor core is avoided to affect the operation efficiency of the turbo-generator, the operation of the rotor core and the turbo-generator with the same is stable, and the service life of the turbo-generator is greatly prolonged.

Description

Technical Field

[0001] This invention relates to a rotor core and a steam turbine generator having the rotor core. Background Technology

[0002] The rotor core is a key component of a steam turbine generator, forming part of the magnetic circuit. It possesses excellent magnetic permeability but is also a major contributor to the generator's temperature rise. In existing rotor cores 101, the centerline 104 between the opposite slot sidewalls 103 of two adjacent rotor laminations 102 is equidistant from the sidewalls of the laminations on either side, creating a symmetrical structure for each individual lamination. After multiple rotor cores 101 are axially stacked and connected, the sidewalls of the same row of laminations 102 meet to form a side plane. When wires are wound around this side plane, there is no heat dissipation gap between the wires and the side plane. Figure 1 As shown, during the operation of a steam turbine generator, its internal rotor core generates magnetic circuit losses and heat losses. These losses are converted into heat energy, causing the steam turbine generator temperature to rise. Excessive temperature can lead to aging of the rotor core surface insulation, thereby affecting its working efficiency and operational safety. Reducing the losses generated in steam turbine generators, improving the cooling system, and increasing the heat dissipation capacity of the steam turbine generator to limit temperature rise have always been major issues in the development of steam turbine generators. Summary of the Invention

[0003] The present invention aims to provide a rotor core with simple structure, high heat dissipation capacity, stable and reliable operation, and a steam turbine generator having the rotor core, so as to improve the service life of the steam turbine generator.

[0004] The rotor core of the present invention includes a plurality of rotor laminations spaced apart. A first groove is provided on two opposite sidewalls on one side of the free end of each rotor lamination. The center line between the opposite sidewalls of the first grooves on two adjacent rotor laminations is c from the sidewall of one rotor lamination and d from the sidewall of the other rotor lamination, where d > c or d < c.

[0005] The steam turbine generator with the rotor core described in this invention includes multiple rotor cores, which are stacked and connected together along the axial direction. At least one rotor core is connected to an adjacent rotor core with opposite sides, such that after the connection is completed, the side wall formed by the rotor laminations in the same row forms a concave-convex surface, and the distance between the concave and convex surfaces is the difference between distance d and distance c.

[0006] The rotor core and turbine generator having the rotor core of this invention have an asymmetrical structure because the center line between the opposite first slot sidewalls of two adjacent rotor laminations on the rotor core is 'c' from the sidewall of one rotor lamination and 'd' from the sidewall of the other rotor lamination, where 'd' > c or 'd' < c. Therefore, when multiple rotor cores are axially stacked together, at least one rotor core is mated with its adjacent rotor core on opposite sides. This ensures that after mating, the rotor cores located in the same row... The sidewalls formed by the laminations are concave and convex, and the distance between the concave and convex surfaces is the difference between distance d and distance c. After the wire is embedded on the sidewall of the rotor lamination, there is a gap between the wire and the aforementioned concave surface. This gap is the heat dissipation space of the rotor core. Under the premise of ensuring the magnetic circuit and strength of the rotor core, the heat dissipation capacity and heat dissipation uniformity of the rotor core are greatly improved, avoiding large local temperature differences in the rotor core that affect the operating efficiency of the steam turbine generator, ensuring the stable operation of the rotor core and the steam turbine generator with the rotor core, and greatly extending the service life of the steam turbine generator. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the existing rotor core structure.

[0008] Figure 2 This is a schematic diagram of the rotor core structure of the present invention.

[0009] Figure 3 This is a schematic diagram of the structure of the present invention after multiple rotor cores are stacked together.

[0010] Figure 4 for Figure 3 The main view.

[0011] Figure 5 for Figure 4 A top view of one row of rotor laminations.

[0012] Figure 6 This is a partially enlarged view of the wire-embedded state of the present invention. Detailed Implementation

[0013] A type of rotor core, such as Figure 2 As shown, the rotor laminations include multiple spaced-apart rotor laminations 1. First grooves 2 are respectively provided on two opposite sidewalls of one free end of each rotor lamination 1. The center line 3 between the opposite sidewalls of the first grooves 2 on two adjacent rotor laminations 1 is a distance from one sidewall of the rotor lamination 1 and b distance from the other sidewall of the rotor lamination 1, where b > a or b < a. Figure 2As shown, the distance 'a' is the distance between the centerline 3 and the sidewall of the first slot 2 on two adjacent rotor laminations 1. The values ​​of 'a' and 'b' are determined based on calculations of the actual magnetic circuit, and the calculation method is existing technology.

[0014] The rotor core also includes an annular body 4 on which rotor laminations 1 are disposed. Multiple sets of rotor lamination groups are disposed at intervals on the annular body 4, and each set of rotor lamination groups includes multiple rotor laminations 1 disposed at intervals. In this embodiment, four sets of rotor lamination groups are disposed.

[0015] On the sidewall of the annular body 4 facing the first and last rotor laminations 1 in each group of rotor laminations, there is a second groove 5 that is opposite to the first groove 2 on the corresponding rotor lamination 1. The center line 3 between the sidewall of the first groove 2 and the sidewall of the second groove 5 is a distance from the sidewall of the corresponding rotor lamination 1 and b distance from the sidewall of the annular body 4, where b > a or b < a.

[0016] Multiple assembly holes 6 are provided on the annular body 4 to facilitate assembly.

[0017] A positioning groove 7 is provided on the side wall of the inner through hole of the annular body 4.

[0018] A steam turbine generator having the above-mentioned rotor core, such as Figures 3 to 6 As shown, the device includes multiple rotor cores as described above, which are stacked and connected together axially. At least one rotor core is mated with an adjacent rotor core with opposite faces. After mating, the sidewall formed by the rotor laminations 1 in the same row forms a concave-convex surface, and the distance between the concave surface 8 and the convex surface 9 is the difference between distance b and distance a. In this embodiment, four rotor cores are stacked and connected together axially, with adjacent rotor cores mating with opposite faces. This allows the concave-convex surface formed by the sidewall formed by the rotor laminations 1 in the same row to have an alternating structure of concave surface 8 and convex surface 9. This creates multiple heat dissipation spaces on the sidewall formed by the rotor laminations 1 in the same row, further improving the heat dissipation performance of the rotor core and making the heat dissipation more uniform. This further ensures the operational stability of the rotor core and extends the life of the turbine generator.

Claims

1. A rotor core comprising a plurality of spaced rotor laminations (1), wherein a first groove (2) is respectively provided on two opposite sidewalls on one side of the free end of each rotor lamination (1), characterized in that: The rotor core also includes an annular body (4), on which multiple sets of rotor laminations are spaced apart. Each set of rotor laminations includes multiple spaced rotor laminations (1). The sidewalls of the annular body (4) facing the first and last rotor laminations (1) in each set of rotor laminations are provided with a second groove (5) opposite to the first groove (2) on the corresponding rotor lamination (1). The center line (3) between the sidewalls of the first groove (2) and the sidewalls of the second groove (5) is a distance from the sidewall of the corresponding rotor lamination (1) and b distance from the sidewall of the annular body (4), where b > a or b < a. The center line (3) between the sidewalls of the first grooves (2) on two adjacent rotor laminations (1) is c distance from the sidewall of one rotor lamination (1) and d distance from the sidewall of the other rotor lamination (1), where d > c or d < c.

2. The rotor core according to claim 1, characterized in that: Multiple assembly holes (6) are provided on the annular body (4).

3. The rotor core according to claim 1 or 2, characterized in that: A positioning groove (7) is provided on the side wall of the inner through hole of the annular body (4).

4. A steam turbine generator, characterized in that: It includes multiple rotor cores as described in any one of claims 1-3, the multiple rotor cores are stacked together along the axial direction to form a whole, wherein at least one rotor core is docked with the adjacent rotor core with opposite sides, such that after docking, the side wall surface formed by the rotor laminations (1) in the same row forms a concave-convex surface, and the distance between the concave surface (8) and the convex surface (9) is the difference between distance b and distance a or the difference between distance c and distance d.

5. The steam turbine generator according to claim 4, characterized in that: Adjacent rotor cores are connected with opposite faces, so that the sidewalls formed by the rotor laminations (1) in the same row can have an alternating concave (8) and convex (9) structure.

6. The steam turbine generator according to claim 4 or 5, characterized in that: The rotor core consists of four parts, which are stacked together along the axial direction to form a single unit.

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