封闭自散热式永磁发电机温升计算
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摘要
永磁发电机常作为副励磁机而存在,而现有励磁发电机的温升计算并不完全适用于永磁发电机,本文基于对电机的散热分析和适当的简化模型,运用传热学基本理论,对封闭自散热式永磁发电机进行了温升计算,并与电阻法实测值进行了对比。结果表明计算值高于实测值,差值不大于3K,且远低于发电机的最高允许工作温度,计算结果合理可靠,故本文提出的计算模型较为准确,可用于封闭自散热式永磁发电机温升的简易计算。
Permanent-magnet generator usually exists as the second exciter, but the temperature rise calculation of general exciting generator is not completely applicable to permanent-magnet generator.Through the basic theory of heat transfer, the temperature rise calculation and contrast with measured value of resistance method are carried out in this paper based on the heat dissipation analysis and appropriate simplified model. The result indicated that calculates value is higher than measured value and not excees 3 K, and that is more less than maximum allowable operation temperature, the result is reasonable and reliable. Therefore, the calculation model presented in this paper is more accurate, and can be used for sample calculation of permanent-magnet generator's temperature rise.
Permanent-magnet generator usually exists as the second exciter, but the temperature rise calculation of general exciting generator is not completely applicable to permanent-magnet generator.Through the basic theory of heat transfer, the temperature rise calculation and contrast with measured value of resistance method are carried out in this paper based on the heat dissipation analysis and appropriate simplified model. The result indicated that calculates value is higher than measured value and not excees 3 K, and that is more less than maximum allowable operation temperature, the result is reasonable and reliable. Therefore, the calculation model presented in this paper is more accurate, and can be used for sample calculation of permanent-magnet generator's temperature rise.
引文
[1]E·维德曼,W克伦贝格尔.电机结构[M].北京:机械工业出版社,1976.
[2]俞左平.传热学[M].北京:高等教育出版社,1979:105-120.
[2]俞左平.传热学[M].北京:高等教育出版社,1979:105-120.