PCB绕组盘式电机CFD热分析  

CFD thermal analysis for disk-type machine with PCB windings

作　　者：高鹏 赵鸿健 王晓远 GAO Peng;ZHAO Hongjian;WANG Xiaoyuan(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072

出　　处：《电机与控制学报》2024年第9期36-46,共11页Electric Machines and Control

摘　　要：印制电路板(PCB)绕组盘式电机具有零齿槽转矩、高功率密度、高效率、高设计灵活性、高加工精度等诸多优点,可广泛应用于航空、工业驱动、风力发电等领域。然而,内定子外转子结构的PCB绕组盘式电机受空间限制,定子散热困难,易产生绝缘老化、永磁体退磁等问题。为实现对PCB绕组盘式电机热特性的精确计算,研究气隙封闭条件下流体域的对流散热问题。探究电机内PCB绕组上热量散出的传热路径,提出一种采用由实验关联式导出空气等效导热系数的计算方法,利用计算流体力学(CFD)方法对内部流体流动和热特性进行仿真分析。结果表明PCB绕组盘上90%的热量进入气隙,空气等效导热系数的理论和仿真计算值误差不超过5%。最后设计并制造采用单定子双转子结构的PCB绕组盘式电机实验原理样机,通过实验对理论分析的正确性和仿真计算结果的精确性进行验证。Printed circuit board(PCB)winding axial-flux machines have many advantages such as zero cogging torque,high power density,high efficiency,high design flexibility,and high processing preci-sion.They can be widely used in fields such as aviation,industrial drives,and wind power generation.PCB winding axial-flux machines with internal stator and external rotor structure are subject to space limi-tation,which causes the difficulty in dissipating heat from the stator and easily brings about problems such as insulation aging and permanent magnet demagnetization.In order to achieve accurate calculation of the thermal characteristics of PCB-winding axial-flux machines,the convective heat dissipation problem in the fluid domain under closed-end air gap condition was investigated.The heat transfer path of heat dissipation from the PCB winding in the motor was investigated,a calculation method using the equivalent thermal conductivity of air derived from the experimental correlation equation was proposed,and the in-ternal fluid flow and thermal characteristics were simulated and analyzed by using the computational fluid dynamics(CFD)method.The results show that 90%of the heat on the PCB-winding plate enters the air gap,and the error between the theoretical and simulated values of the air equivalent thermal conductivity is under 5%.Finally,the experimental prototype of a PCB-winding disk-type machine with a single sta-tor and double rotor structure was designed and built.Correctness of the theoretical analysis and the accu-racy of the simulation calculation results are verified through experiments,and the results correspond well.

关 键 词：盘式电机 印制电路板绕组 计算流体力学 表面传热系数 绕组铜耗 温升 

分 类 号：TM351[电气工程—电机]