Integrated Numerical and Experimental Study on Thermal Management of Permanent Magnet Synchronous Generator

摘要

Nowadays, the researches of wind generator are mainly based on horizontal axis wind generator in the world. The permanent magnet synchronous generator in this thesis has following advantages: high efficiency, low noise and small volume, etc. The most important characteristic is the excited part of rotor which uses permanent magnet (NdFeB) so that we don't need extra excited circuits. But magnetization curve of permanent magnet is sensitive to temperature. In most cases, due to the overheating of the generator, the performance of permanent magnet is declined and the coil winding is burned out, thus, the generator efficiency is reduced and the service life is shortened. Therefore, the main purpose of this thesis is to design an effective method to overcome the elevated temperature of generator. Above all, this thesis studies the heating efficiency of generator and uses the hydromechanics to analysis software. Then compare the consequence between experiment and simulation of prototype permanent magnet synchronous generator. Finally, in order to solve the problem of heat dissipation, the generator is improved by changing the fin of the generator shell. So it is enough to prove the simulated method and model structure are reliable in this thesis.