高转矩密度集中绕组永磁电机槽内油冷系统研究

发布时间：2019-07-05 11:34

【摘要】：随着电动汽车用驱动电机对功率密度和转矩密度的要求越来越高,电机散热问题成为了限制电机性能提升的重要因素之一。本文针对集中绕组永磁电机,给出一种新型的电机槽内油冷结构,对过载能力较高的电机,冷却效果显著,同时,通过优化电机冷却结构,进一步增强电机高速工况时的冷却效果。本文以适用于高转矩密度集中绕组永磁电机的槽内油冷系统为研究对象,对电机损耗、槽内油冷电-磁-热结构设计及电机内热传递规律进行研究。首先,从准确计算电机温度场角度出发,指出在研究电机损耗时应注意的关键问题,对电机铁耗系数计算、铁耗分布及转子损耗抑制方法进行研究。在此基础上,利用有限元法将槽内油冷和机壳水冷以及浸油冷却进行对比分析,研究槽内油冷结构的冷却特点,为后文槽内油冷结构设计提供指导。其次,对电机进行电磁-冷却结构的综合设计,研究电机槽内安装冷却管道,气隙中增加隔油套筒对电机电磁性能和冷却性能的影响。根据上述分析结果,确定槽内油冷电机结构,利用三维有限元分析电机在不同工况下的散热效果。再次,电机槽内热传导规律以及电机不同工况下热传导方式的变化对电机冷却系统设计意义重大。建立槽内油冷电机单极单槽热网络模型,并与机壳水冷热网络模型进行对比,研究两种冷却方式下电机热传递规律。同时,结合实际样机,利用热网络模型研究电机槽内绝缘及槽内空气腔对电机温度的影响。最后,利用热网络模型和三维有限元对槽内油冷结构进行优化,主要从增强槽内油冷电机高速工况散热能力及优化冷却参数几方面进行,实现电机电磁性能和冷却效果均衡较优。
文内图片：

图片说明：不同绕组端部形状和尺寸说明
[Abstract]:With the increasing demand of the power density and torque density of the driving motor for electric vehicle, the problem of motor heat dissipation is one of the important factors to limit the performance of the motor. In this paper, a new type of oil cooling structure in the motor tank is given in this paper, and the motor with higher overload capacity is given, and the cooling effect is remarkable. At the same time, the cooling effect of the motor is further enhanced by optimizing the cooling structure of the motor. In this paper, the oil cooling system in the groove of permanent magnet motor with high torque density is used as the research object, and the loss of the motor, the electric-magnetic-heat structure of the oil in the tank and the heat transfer law of the motor are studied. First, from the point of accurately calculating the temperature field of the motor, it is pointed out that the key problems should be paid attention to in studying the loss of the motor, and the calculation of the iron loss coefficient of the motor, the distribution of the iron loss and the method for restraining the loss of the rotor are studied. On this basis, the cooling characteristics of the oil cooling structure in the tank were compared and analyzed by using the finite element method, and the cooling characteristics of the oil cooling structure in the tank were studied. Secondly, a comprehensive design of the electromagnetic-cooling structure of the electric machine is carried out, and the influence of the oil-separating sleeve on the electromagnetic performance and the cooling performance of the motor is increased in the air-gap. According to the analysis result, the structure of the oil cold motor in the tank is determined, and the heat dissipation effect of the motor under different working conditions is analyzed by the three-dimensional finite element analysis motor. Thirdly, the law of heat conduction in the motor slot and the change of the heat conduction in different working conditions of the motor are of great significance to the design of the cooling system of the motor. In this paper, the single-pole single-slot thermal network model of the oil-cooled motor in the tank is established, and the heat transfer law of the motor in two cooling modes is studied. At the same time, using the thermal network model, the influence of the air cavity on the temperature of the motor is studied by using the thermal network model. Finally, using the thermal network model and the three-dimensional finite element to optimize the oil-cooling structure in the tank, the cooling capacity of the oil-cooled motor in the tank and the optimization of the cooling parameters are mainly carried out, so that the electromagnetic performance and the cooling effect of the motor are better balanced.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM351

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