大功率异步风力发电机冷却结构分析与研究

Analysis and Research on Cooling Structure of High-power Asynchronous Wind Turbine

随着风电技术的发展,单机容量不断的增大,冷却结构设计、噪声性能、成本等成为电机设计中的关键环节。目前国内外对大功率异步风力发电机通风冷却结构与噪声关联性研究较少。本文以一款异步风力发电机为例,采用CFD仿真分析方法对不同结构冷却器及定、转子通风道流体场及温度场进行模拟计算和分析。研究结果表明:“M”型换热器具有降低电机内部风阻,提升内风量的效果,在满足绕组温升要求下,具有一定成本优势;同时发电机定、转子通风道错开,在一定程度上可降低电机气动噪声。通过以上分析总结,希望对异步风力发电机的冷却结构设计提供一些参考。

With the development of wind power technology and the continuous increase of single machine capacity,cooling structure design,noise performance,cost,etc.have become key links in motor design.At present,there is relatively little research on the correlation between ventilation and cooling structures and noise of high-power asynchronous wind turbines both domestically and internationally.This article took an asynchronous wind turbine as an example and used CFD simulation analysis method to simulate and analyze the fluid and temperature fields of different structure coolers,stator and rotor ventilation ducts.The research results indicate that the M-type heat exchanger has the effect of reducing the internal wind resistance of the motor and increasing the internal air volume.It has a certain cost advantage while meeting the temperature rise requirements of the winding.At the same time,the staggered ventilation channels of the generator stator and rotor can reduce the aerodynamic noise of the motor to a certain extent.Through the above analysis and summary,it is hoped to provide some reference for the cooling structure design of asynchronous wind turbines.