14MW半直驱中速永磁风力发电机温度场分析和冷却结构优化  

Temperature Field Analysis and Cooling Structure Optimization of 14MW Hybrid Drive Medium Speed Permanent Magnet Wind Generator

作　　者：缠东辉 任韶华 王桢 娄利岗 CHAN Donghui;REN Shaohua;WANG Zhen;LOU Ligang(Flender Ltd.,China,Tianjin 300400,China)

机构地区：[1]弗兰德传动系统有限公司,天津300400

出　　处：《大电机技术》2025年第2期78-85,共8页Large Electric Machine and Hydraulic Turbine

摘　　要：本文以14MW半直驱中速永磁风力发电机为研究对象,根据风力发电机的结构参数建立整机三维流体与传热耦合模型,采用有限元分析软件FLUENT计算得出发电机内部温度场,总结了发电机内部传热特性。半直驱中速永磁风力发电机内部风量分布不均匀,上部靠近强冷风机风量较大,下部远离强冷风机风量较小。绕组温度分布不均匀,圆周上绕组的温差较大,上部绕组温度低,下部绕组温度高,高温区域分布在靠近发电机底部两侧位置,永磁体热点温度较高。根据半直驱中速永磁风力发电机内部传热特性对发电机的通风结构进行优化,在发电机驱动端入口增加风道,将冷却空气直接引入发电机底部两侧的绕组高温区域,使得发电机内部阻力下降,风量增大,提高了发电机的冷却性能,降低了发电机内部温升,提高了发电机运行的可靠性。This paper takes a 14MW hybrid drive medium speed permanent magnet wind generator as the research object,the three-dimensional fluid and heat transfer coupling model of the whole generator is established according to the structural parameters of the wind generator.The internal temperature field of the generator is calculated by using the finite element analysis software FLUENT,and the internal heat transfer characteristics of the generator are summarized.The air volume flow rate distribution inside the hybrid drive medium speed permanent magnet wind generator is not uniform,the air volume flow rate near the forced ventilation on the top is more,and the air volume flow rate away from the forced ventilation and near the bottom of the generator is less.The temperature distribution of the winding is not uniform,the temperature difference of the winding on the circumference is larger,the temperature on the top of the winding is low,and the temperature at the bottom of the winding is high,and the high temperature area is distributed on both sides at the bottom of the generator.The hot spot temperature of permanent magnet is higher.According to the internal heat transfer characteristics of the hybrid drive medium speed permanent magnet wind generator,the ventilation structure of the generator is optimized.By adding ventilation ducts on DE side of the generator inlet,the cooling air is directly introduced into the high temperature area of the winding on both sides at the bottom of the generator,the internal resistance of the generator is reduced,the air volume flow rate is increased,the cooling performance of the generator is improved,and the internal temperature rise of the generator is reduced,the reliability of generator operation is improved.

关 键 词：半直驱 中速永磁 温度场 冷却结构 

分 类 号：TM315[电气工程—电机]