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    氢燃料电池用高速永磁同步电机性能的数值研究

    Numerical Study on the Performance of High Speed Permanent Magnet Synchronous Motors for Hydrogen Fuel Cells

    • 摘要: 在利用Maxwell方程组推导了高速永磁同步电机的二维电磁场控制方程的基础上,采用Bertotti铁耗分立模型计算电机铁耗,引入雷诺系数计算风摩损耗,用经典计算公式计算绕组铜耗和涡流损耗,以上损耗值转化为体积生热率施加到电机各发热部件作为温度场分析时的热源,并且考虑材料温变特性和定子非晶合金导热系数各向异性,使用流固耦合法建立了高速永磁电机温升预测模型。依据所建模型进行算例分析,应用Maxwell软件和Fluent软件研究了气隙槽宽、槽肩高和气隙长度对电机磁场、温度场的影响,研究表明气隙槽宽对电机磁场影响较小,适当增大气隙槽宽有利于电机散热。

       

      Abstract: High speed permanent magnet synchronous motor for Hydrogen fuel has high loss, and its temperature rise is related to the coupling of high-speed AC (Alternating current) steady electromagnetic field, flow field and temperature field, which makes it difficult to predict its temperature rise. On the basis of deriving the two-dimensional electromagnetic field control equation of a high-speed permanent magnet synchronous motor using the Maxwell's equations, this paper uses the Bertotti iron loss discrete model to calculate the motor iron loss, introduces the Reynolds coefficient to calculate the wind friction loss, uses the classical calculation formula to calculate the winding copper loss and eddy current loss, and converts the loss value into a volumetric heat generation rate applied to each heating component of the motor as a heat source for temperature field analysis. Considering the temperature variation characteristics of materials and the anisotropy of thermal conductivity of stator amorphous alloy, a temperature rise prediction model of high-speed permanent magnet motor is established by using the fluid solid coupling method. Based on the established model, numerical analysis was conducted using Maxwell and Fluent software to study the effects of air gap slot width, slot shoulder height, and air gap length on the magnetic field and temperature field of the motor. The influence curve was drawn, and it was found that the air gap slot width had a small impact on the magnetic field of the motor. Increasing the air gap slot width appropriately was beneficial for motor heat dissipation, providing theoretical support for electromagnetic field analysis and temperature rise prediction of high-speed permanent magnet synchronous motors.

       

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