Power unit which integrated the principle of axial piston pump with permanent magnetic synchronous motor was coneeived. Its structure and working principle were introduced. ANSYS/Emag module was applied to simulate the electric magnetic field of the motor pump with different types of cooling channel under the condition of load and unload. The simulation results were processed to get the electric magnetic field distribution and magnetic induction intensity within oil gap for different motor pump models. By inputting the data of magnetic induction intensity within oil gap into software MATLAB and analyzing with Fourier, the distributions of harmonic and fundamental were obtained. The research shows that the core of motor pump with 12 rectangle section channel with circle end is not easy saturation. The investigation provides basis for designing and optimizing the hydraulic motor pump.%提出轴向柱塞泵和永磁同步电机一体化的动力单元,介绍永磁同步轴向柱塞液压电机泵的结构和工作原理.利用ANSYS/Emag模块对带有不同冷却流道的电机泵模型对应的空载和负载电磁场进行数值计算并对结果进行处理,得到不同电机泵模型的电磁场分布及油隙磁感应强度,并进行对比分析;将ANSYS中的负载油隙磁感应强度数据导入MATLAB进行傅里叶分析,得到基波和高次谐波的分布情况.研究结果表明:带有12个条形冷却流道的电机泵铁心不易饱和,谐波影响最小.研究结果为永磁同步驱动轴向柱塞液压电机泵的设计与优化提供理论依据.
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