摘要
隨著風力發電的迅速發展,對高轉差率異步發電機的單機容量和運行安全性提出了更高的要求。單機容量以及各項技術指標不斷增加,引起電機各部分溫度升高,這直接影響電機的使用壽命和運行的安全可靠性,所以對現代電機的發熱與冷卻問題進行研究顯得日益重要。
在高轉差率異步發電機的設計中,合理掌控電機穩態時的溫升和其他各項指標,是電機研發成功與否的重要因素。在電機設計階段,只有初步計算電機的溫度分布和相關部件所限制的平均溫升,才能對風機的熱處理進行研究,進而使設計方案更加先進合理。
本文以160kW-6型電機為研究對象,對電機內溫度場進行耦合分析。根據傳熱學理論,首先建立了電機二維溫度場的模型,其次建立了電機轉子部分三維溫度場的模型,給出了電機損耗及散熱系數的計算方法。應用有限元軟件ANSYS進行計算分析。最后分析了轉差率變化對電機溫度場分布的影響,以及有效的散熱方法,得出了一些有益的結論。
關鍵詞 溫度場;高轉差率異步發電機;有限元法;ANSYS
Analysis on the temperature field in high slip induction generator
Abstract
With the fast development of wind power, the unit capacity and running safety of high slip induction generator is expected to reach a higher level. The higher temperature of each part of motor caused by the increase of unit capacity and technical indicators directly affects motor’s service life, operating safety and reliability. Thus, it is increasingly essential to research on heating and cooling for modern motor.
For designing high slip induction generator, it is decisive to soundly control motor’s steady-state temperature rise and other indicators. In the period of motor designing, only preliminarily calculating the temperature distribution of the motor and average temperature rise limited by related components, can thermal treatment for wind generator be researched. In this way, design solutions can be more rational.
This paper studies 160kw-6 motor, making coupling analysis on temperature field inside motor. According to heat transfer theory, this paper firstly build up a motor’s two-dimensional temperature field model, and secondly rotator’s partial three-dimensional temperature field model,offering calculation method for motor loss and thermal coefficient by applying the finite element software ANSYS to calculate and analyze. To sum up, this paper comes to useful conclusions by analyzing the slip change’s effects on motor temperature field distribution and useful cooling method.
Keywords Temperature field; High slip induction generator; Finite element; ANSYS
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