中文摘要：

为了得到一对径向充磁永磁体在电磁场中受力计算公式，对行波磁场驱动的血泵磁场耦合模型进行分析，对永磁体采用等效电流模型进行理论推导．以大间隙外磁驱动血泵的双极四状态驱动装置为计算实例，应用推导所得到的公式计算血泵永磁体转子在旋转一周的过程中所受到的磁力，利用Ansys仿真验证公式的正确性．根据耦合模型、计算公式和角位移一受力分量曲线，分析影响永磁体所受磁力大小的因素：永磁体磁化强度、磁极分界面面积、两磁极交接面中心处磁场强度的差值均与永磁体受到的磁力的大小成正比；耦合距离越大，永磁体受力越小．

英文摘要：

In order to obtain the magnetic force calculation formula of single pair radial magnetizing permanent magnet in magnetic field, the magnetic field coupling model of traveling magnetic field driven blood pump was analyzed. According to the equivalent current theory of the permanent mag- net, a detailed theoretical derivation was presented. Taking the two-poles-four-stages driven system as an example, the application of the obtained formula to calculate the blood pump rotorrs magnet force in one cycle was verified by the ANSYS, and the results showed the correctness of calculation. According to the coupling model, calculation formula and angular displacement-force component curves, the factors which affect the magnetic force of permanent magnet were analyzed. The results show that the magnetization of the permanent magnet, the interracial area of the poles, and the differ- ence of magnetic field strength of the poles at the center of the interface are in proportion to the mag- netic force, while the coupling distance is in inverse proportion to the magnetic force.