永磁式發電機磁通量及散熱效率改進之研究

Abstract

本研究的目的是提高磁通量來增加永磁發電機的效率，並且改善發電機的傳熱性能以及降低了發電機的重量。在不改變永磁發電機的外部尺寸的情況下，透過設計發電機定子和轉子的結構，使磁通量將增加、工作溫度降低以及重量減輕。使用有限元方法執行上述分析和發電效率計算，以靜態和瞬態方法來研究其性能。透過瞬態分析證明改變矽鋼片幾何形狀可以增加磁通密度。透過挖孔的方式，除了增加散熱外表面積還可提升散熱速度。空心轉子與支撐肋條的設計可以減輕發電機重量，而且不會影響磁通量。

This research aims to improve the efficiency of a permanent magnet generator by increasing the magnetic flux, modifying the heat transfer property, and reducing the weight of the generator. Without changing the outer dimensions of the permanent magnet generator, the structures of the rotor and stator are designed in such a way that the magnetic flux will be increased, the temperature lowered, and the weight reduced. The finite element method is used to perform the above analyses and the power generation efficiency is studied via static and transient approaches. It has been shown in the transient analysis the change of the geometry of silicon steel can increase the magnetic flux density. The creation of holes and addition of cooling fins on the outer surface of the stator can increase heat dissipation and cooling rate. The design of hollow rotor with supporting ribs can reduce weight without affecting the magnetic flux.