Permanent magnet auxiliary exciter for steam turbine electric generator

Abstract

The invention belongs to the technical field of steam turbine electric generators, and provides a permanent magnet auxiliary exciter for a steam turbine electric generator, wherein the permanent magnet auxiliary exciter comprises a stator and a rotor which are arranged in a matched manner, and the rotor comprises a sleeve, a plurality of N-pole magnetic pole groups, a plurality of S-pole magneticpole groups and spacing cushion blocks; the N-pole magnetic pole groups and the S-pole magnetic pole groups are fixed on the outer side of the sleeve at intervals along the circumference; the spacingcushion blocks are arranged between the N-pole magnetic pole groups and the S-pole magnetic pole groups which are adjacent to each other. Compared with the prior art, the rotor of the permanent magnetauxiliary exciter adopts a surface-mounted structure, and magnetic steel is fixed on the sleeve by using bolts through a pressing plate, so that the optimization design of the pole-arc coefficient ofa motor is facilitated, and the excellent waveform is ensured; by arranging the spacing cushion blocks between the magnetic poles of the rotor, magnetic flux leakage is reduced, and air resistance and wind noise caused by high-speed rotation are reduced. Through reasonable arrangement of the stator, the voltage waveform is improved, the winding arrangement is more convenient, and the processing technology is simplified.

Description

technical field [0001] The invention relates to the technical field of turbogenerators, and specifically discloses a permanent magnet secondary exciter for a turbogenerator. Background technique [0002] The permanent magnet auxiliary exciter with permanent magnet material as the excitation source does not require additional excitation power supply, the power supply voltage is stable, the excitation response speed is fast when the system voltage drops, and the strong excitation voltage can be provided quickly, and the system voltage recovery time is short. Especially suitable for unstable countries and regions. The system composed of the main exciter and the permanent magnet auxiliary exciter has no slip rings and carbon brushes, and there is no problem of carbon powder, noise, maintenance difficulty and reliability decline caused by them, and there are no sparks caused by slip rings and carbon brushes. Maintenance And the electrical wiring is simple, the excitation equipme...

AI Technical Summary

Problems solved by technology

[0003] However, the stator voltage waveform of the existing permanent magnet auxiliary exciter is greatly distorted, and the rotor structure has potential safety hazards

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