Magnetic shielding device for shaft-diameter-cut multi-directional evacuation flux leakage at the end of turbogenerator

Abstract

The invention discloses a shaft-diameter-cut multi-directional cooperative magnetic shielding device for evacuating magnetic flux leakage at the end of a turbogenerator, which aims to plan the distribution of magnetic flux leakage at the end by utilizing the characteristics of low magnetic resistance and anisotropy of the shield, Solve the problem of unreasonable accumulation of magnetic flux leakage at the end of the generator. The complex structure and current distribution of the generator stator end directly lead to a very complicated distribution of magnetic flux leakage at the end. By setting soft magnetic silicon steel with different stacking directions at the end of the turbogenerator, the complex distribution of parasitic magnetic flux leakage at the end of the generator is realized. Through timely and effective multi-directional evacuation, the joint suppression of leakage flux entering the iron core and the effect of inducing large eddy currents in the casing and end baffles to cause local overheating of structural parts can ensure the safety of the end structure of large-capacity turbogenerators. long term health. This multi-directional shielding device for evacuating magnetic flux leakage greatly improves the protection degree of the stator end structure of the generator, and avoids adverse hazards such as force vibration and thermal deformation of the stator end structure and the occurrence of malignant accidents.

Description

technical field [0001] The invention relates to the technical field of motors, and belongs to the field of electrical engineering, in particular to a magnetic shielding device for shaft-diameter-cut multi-directional evacuation of magnetic flux leakage at the end of a turbogenerator. Background technique [0002] With the continuous improvement of the capacity of the turbogenerator, its electromagnetic load increases sharply. Due to the complex structure of the end area of ​​the turbogenerator, the distribution of electric density at the end is also very complicated, which will lead to a complex distribution of magnetic flux leakage and a magnetic load at the end of the generator. Increase, since the magnetic flux leakage at the end of the generator is a useless parasitic magnetic field, how to effectively shield the magnetic flux leakage at the end of the generator has always been a technical problem that plagues the electrical engineering and academic circles. The magnetic ...

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Problems solved by technology

[0003] In order to suppress the influence of the parasitic magnetic flux leakage at the end on the stator core and other metal structural parts, the end of the existing large-capacity turbogenerator usually adopts a magnetic shunt structure to simply suppress the magnetic flux leakage. For the existing turbogenerator The magnetic shielding at the end of the machine is formed by punching the magnetically conductive silicon steel sheet into a circular ring and laminating it along the axial direction. However, this single type of shielding is only a simple shielding of the local leakage field at the end. Many structures at the end of the generator, such as baffles and stator casings, will still be violated by the leakage flux at the end, and the existing simple independent radial-tangential shielding at the end of the generator cannot achieve protection against the generator. Effective dispersion of magnetic flux leakage at the end, so the present invention proposes a magnetic shielding device for shaft-diameter-cut multi-directional cooperative evacuation of magnetic flux leakage at the end of the turbogenerator

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