为保证微型轴流式血泵的稳定、可靠运行，必须对大间隙磁力传动系统电磁发生装置的温升进行研究和控制．文中通过对磁力驱动系统各部件的温度分布、热量损失、热流密度以及热梯度等热物理参数进行分析，建立了系统电磁发生装置的热场仿真模型; 通过有限元仿真及实验研究，得到了系统温度场的分布和变化规律; 为保证人体适应性及电磁体的长时间运行，以控制电磁体温升为目标，对电磁驱动系统的电磁参数、运行环境参数等进行了仿真和优化设计．结果表明: 减少电磁体损耗和改善电磁体散热条件能够有效降低电磁体温升，当电磁体单个线圈通电电流小于0．56 A、空气流速大于3．5 m/s 时，电磁体最高温度不超过50℃．

In order to guarantee stable and reliable operation of micro axial- flow blood pumps,the temperature riseof electromagnet in the large- gap magnetic drive system should be investigated and accurately controlled.In thispaper,the temperature distribution,heat loss,heat flux and thermal gradient of various components of the systemwere analyzed,and a simulation model of the thermal field of the electromagnet was established.Then,the distri-bution and variation law of the system temperature field were obtained via finite element simulation and experimentinvestigation.Finally,to meet the requirements of human body adaptability and long- term running of the electro-magnet,the electromagnetic and environmental parameters of the electromagnetic drive system were simulated andoptimized by taking a suitable temperature rise of the electromagnet as the target.The results show that the tempera-ture rise of the electromagnet can be effectively reduced by decreasing the loss and improving the heat emission con-dition of the electromagnet; and that the highest temperature of the electromagnet does not exceed 50 ℃ when thecurrent of electromagnet coils is lower than 0.56A and when the air velocity is higher than 3.5m/s.