In order to reliably make use of superconductors in wind generators, a double-stator superconducting flux modulation generator is proposed here to avoid rotation of field coils and armature windings. The superconducting field coils are located in the inner stator while the armature windings are placed in the outer stator. In this way, the stationary-rotatory couplings of current and cryogenic coolants for superconducting field coils and/or armature windings are removed. Because of the modulation effect of the reluctance rotor between the two stators and the armature reaction field, moving AC magnetic fields are acted on superconducting coils in the inner stator. These moving AC magnetic fields are called magnetic field harmonics in the flux modulation generators. The frequencies of these harmonics are multiples of rotor mechanical frequency. Compared to synchronous superconducting generators, the amplitudes of the harmonics are higher. Even though methods to reduce the amplitudes of harmonics have been studied, the level of the AC loss in the superconducting field coils is still unknown. In this paper, numerical simulations based on the T–A formulation are used to estimate the AC loss of the superconducting field coils in a 10 MW double-stator superconducting flux modulation generator. It is found that by choosing a suitable working temperature, the AC loss of the superconducting field coils without any harmonic reduction methods is not very high, but eddy current loss of copper thermal shield inside the cryostat is significantly higher.

为了在风力发电机中可靠地使用超导体，这里提出了一种双定子超导磁通调制发生器，以避免励磁线圈和电枢绕组的旋转。超导磁场线圈位于内部定子中，而电枢绕组位于外部定子中。以此方式，用于超导场线圈和/或电枢绕组的电流和低温冷却剂的固定-旋转耦合被去除。由于两个定子之间的磁阻转子和电枢反应场的调制作用，移动的交流磁场作用在内部定子的超导线圈上。这些移动的交流磁场在通量调制发生器中被称为磁场谐波。这些谐波的频率是转子机械频率的倍数。与同步超导发电机相比，谐波的幅度更高。尽管已经研究了降低谐波幅度的方法，但超导磁场线圈中的交流损耗水平仍然未知。在本文中，数值模拟基于Ť -甲制剂被用于估计在10 MW双定子超导通量调制发生器的超导励磁线圈的交流损耗。研究发现，通过选择合适的工作温度，未采用任何谐波降低方法的超导磁场线圈的交流损耗并不是很高，但低温恒温器内部铜热屏蔽的涡流损耗明显更高。