中型高压电机轴径向混合通风结构的强化散热特性模拟

Simulation Study on Heat Dissipation Enhancement Characteristics of Axial and Radial Mixed Ventilation Structure for Medium-sized High-voltage Motor

为了提升电机的通风冷却性能、降低其运行温升,以一台400 kW中型高压电机为例,采用轴径向混合通风结构,通过磁-流-固耦合模拟研究整体电机稳态条件下温升影响规律,提出温升均匀性系数对两种通风结构的冷却效果进行量化评价。研究结果表明:相对于轴向通风结构,混合通风结构温升分布更加均匀,在电机内层和外层绕组温升均匀性系数分别提高了85.78%和6.23%;进一步探讨了径向风道高度及数量对电机温升的影响,径向风道高度为6 mm、径向风道数量为13个时冷却效果最好。

The axial and radial mixed ventilation structure is adopted in order to improve the ventilation and cooling performance and reduce the operating temperature rise of the motor.Taking a 400 kW medium-sized high voltage motor as an research object,the influence law of temperature rise of the integral motor under steady state condition is studied through magnetic-fluid-solid coupling simulation.The cooling effect of the ventilation structure is quantitatively evaluated by proposing temperature rise uniformity coefficient.The results show that the temperature rise distribution of mixed ventilation structure is more uniform,and the uniformity coefficient of temperature rise is 85.78%and 6.23%higher than that of axial ventilation structure in the inner and outer winding of motor,respectively.The influence of the height and number of radial air ducts on motor temperature rise is further studied.Cooling effect is the best when the height is 6 mm and the number of radial duct is 13.