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Study on Key Technique in Hybrid Excitation Wind Turbine Generator

Author: ZhangShiJun
Tutor: TangRenYuanï¼›AnZhongLiang
School: Shenyang University of Technology
Course: Motor and electrical
Keywords: Mixed Excitation wind turbines Three-dimensional field Eddy current loss Finite Element Method
CLC: TM315
Type: Master's thesis
Year: 2010
Downloads: 188
Quote: 4
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Abstract


Hybrid excited generator with traditional electrically excited synchronous motors and permanent magnet synchronous motor structure. Both permanent magnets on the type of motor has electric field winding, two mmf sources exist. It integrates the advantages of electrically excited synchronous motor tune magnetic convenient, at the same time overcome the defects of the air-gap magnetic field of the permanent magnet synchronous motor adjustment difficult, with a larger application value. Hybrid excited generator with permanent magnet synchronous generator small size, simple structure and magnetic transfer convenience. But most of the hybrid excitation generator capacity. Design large capacity hybrid excitation generator, motor volume, the use of three-dimensional finite element electromagnetic field time-consuming. At the same time, the low-order harmonics caused permanent magnet eddy current losses could easily lead to the permanent magnetic body temperature is high and demagnetization. Also, the motor rotor poles with the pole piece structure, the presence of the permanent magnet slot will reduce the mechanical strength of the rotor poles. The key technical issues for of hybrid excitation wind turbines design study, the main content of the following parts: First, to introduce the structure and operating principle of the hybrid excitation generator. Through the analysis of a variety of magnetic circuit of the type of motor in case of no-load, a the hybrid excitation generator equivalent two-dimensional axial length calculated. Calculated under different cross-section of the two-dimensional field, to draw equivalent shaft length correction factor curve. And two dimensional field of hybrid excitation generator. Equivalent axial length calculated by load electromotive force of the 10kW prototype test validation. Eddy current losses to produce permanent magnets cause analysis, summed up the speed and frequency of the air-gap harmonic magnetic field relative to the stator and rotor. Study the impact factors, a permanent body of the magnetic vector potential waveform using the finite element calculation of the permanent magnet eddy current loss, eddy current density waveform and eddy current distribution. Calculate the air gap under no-load and load harmonic magnetic field. Prototype harmonic load conditions and calculation of eddy current losses in the fundamental current, motor temperature rise test. Summarizes the impact of the air gap length, permanent magnet chamfered and different rotor pole structure of the eddy current loss. Finally, mechanical analysis and calculation of rotor pole. With ANSYS finite element analysis software of permanent magnet slot position changes and magnetic isolation bridge length changes of the pole strength. Using ANSOFT software across the magnetic bridge length of the radial magnetic flux leakage factor for motor design ideas.

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CLC: > Industrial Technology > Electrotechnical > Motor > Generators, large the generator group ( Zonglun,) > Wind turbines
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