The high-T _c superconducting (HTS) dynamo exploits the nonlinear resistivity of an HTS tape to generate a DC voltage when subjected to a varying magnetic field. This leads to the so-called flux pumping phenomenon and enables the injection of DC current into a superconducting coil connected to the dynamo without current leads. In this work, the process of charging a coil by an HTS dynamo is examined in detail using two numerical models: the minimum electromagnetic entropy production and the segregated -formulation finite element model. The numerical results are compared with an analytical method for various airgaps and frequencies. Firstly, the I–V curves of the modeled HTS dynamo are calculated to obtain the open-circuit voltage, short-circuit current and internal resistance. Afterward, the process of charging a coil by the dynamo including the charging current curve and its dynamic behavior are investigated. The results obtained by the two models show excellent quantitative and qualitative agreement with each other and with the analytical method. Although the general charging process of the coil can be obtained from the I–V curve of the flux pump, the current ripples within a cycle of dynamo rotation, which can cause ripple AC loss in the HTS dynamo, can only be captured via the presented models.

所述高Ť _Ç超导（HTS）发电机利用一个HTS带时经受变化的磁场以产生DC电压的非线性电阻率。这导致了所谓的磁通泵浦现象，并使直流电流注入连接到发电机的超导线圈中，而无需电流引线。在这项工作中，使用两个数值模型详细检查了 HTS 发电机给线圈充电的过程：最小电磁熵产生和分离公式有限元模型。将数值结果与各种气隙和频率的分析方法进行比较。首先，I - V 计算建模的 HTS 发电机的曲线以获得开路电压、短路电流和内阻。然后，研究了发电机给线圈充电的过程，包括充电电流曲线及其动态行为。两个模型获得的结果显示出彼此之间以及与分析方法之间极好的定量和定性一致性。虽然线圈的一般充电过程可以从磁通泵的I - V曲线获得，但发电机旋转一个周期内的电流纹波会导致 HTS 发电机中的纹波交流损耗，只能通过所呈现的楷模。