3MW永磁风力发电机内部传热特性研究

Investigation of Heat Transfer Characteristic inside 3MW Permanent Magnet Wind Generator

由于风力发电机的容量增加,发电机的通风结构和损耗分布也变得越来越复杂,电机的温升设计成为关键问题之一。为了解决这一难题,本文根据流体力学以及传热学理论,阐明了流体与固体耦合直接求解温度场的数学关系。并且以一台3MW大型永磁风力发电机为例,结合发电机通风性能以及结构特点,在基本假设的基础上,建立了发电机三维定转子温度场物理模型。通过给出相应的边界条件,采用有限体积元法对发电机内部的温度场进行了数值计算。最后对发电机内部的传热特性以及温升分布进行了详细地分析,为发电机结构优化以及更大容量风力发电机的温升设计提供了理论依据。

Ventilation structure and loss distribution of wind,generator become more complex due to increase of its capacity, and design of temperature rise becomes one of the pivotal problems. The numerical relationship of fluid and solid coupled, by which thermal filed is computed directly, is clarified in this paper in order to solve the matter according to hydromechanics and heat transfer theory. A 3MW large permanent magnet wind generator was taken as an example, physical model of three dimensional stator and rotor temperature field was established on the basis of basic assumptions considering ventilation characteristic and structure feature of generator. The thermal field inside generator was calculated numerically using finite volume method by giving corresponding boundary conditions. Finally, heat transfer characteristic and temperature rise distribution of generator were analyzed in detail, by which a theory gist for structure optimization of the generator and thermal rise design of the larger eaoacitv wind generator is orovided.