Magnetic levitation load shedding device used for hydro-generator

Abstract

The invention discloses a magnetic levitation load shedding device used for a hydro-generator. The device comprises an iron core, a plurality of annular windings arranged at the lower side surface ofthe iron core, and an armature arranged below the iron core and having a work air gap with the windings, the iron core is fixedly arranged around a water turbine main shaft, and a gap is reserved between the iron core and the water turbine main shaft, the armature is fixedly arranged on the water turbine main shaft, the lower side surface of the iron core is provided with a plurality of iron coretooth portions arranged in a concentric circular manner by regarding the axis of the water turbine main shaft as the center, a wire slot is arranged between each two adjacent iron core tooth portions,and the plurality of annular windings are respectively arranged in the wire slots. According to the device, the downward axial force of the water turbine can be offset so that the load of a thrust bearing can be reduced; and in different conditions, the device can also adjust the exciting current to control the electromagnetic force according to the change of the axial load of the thrust bearingso that the thrust bearing can be free of repeated impacts of a fluctuating force, the stress is stable, the damage is avoided, and the interference with a generator can be reduced.

Description

technical field [0001] The invention relates to a magnetic levitation device for overcoming axial force in a vertical shaft hydroelectric generator set, belonging to the key technology of hydroelectric generator systems and the field of magnetic levitation. Background technique [0002] At present, my country's power industry has entered a period of prosperity and development. This period is developing towards a large-scale power grid and generating units, and has the characteristics of high informatization and high technology. In the field of hydropower generation, my country has built many large-scale hydropower units with a single-unit capacity of 700MW, and has the ability to independently research and develop them. A hydroelectric power generation device with a unit capacity of 1000MW or above can integrate and fully resource and improve economic benefits, which is very suitable for the development status of my country's hydropower generation. "my country's "13th Five-Y...

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Problems solved by technology

[0005] Technical problem: In order to overcome the problems of heavy load, easy aging and damage, difficult maintenance and high economic cost of the thrust bearing of the existing load-bearing device of the vertical shaft hydroelectric generator, the present invention proposes a simple and reliable structure, which can overcome most of the problems for the thrust bearing. Or all axial force, reducing the maintenance frequency and economic cost of the magnetic levitation load reduction device for hydroelectric generators. This device greatly reduces the bearing load while stabilizing the force, reducing the vibration caused by force fluctuations Damage and disturbance to power generation system

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