High temperature superconducting (HTS) synchronous machines are compact and light weight machines with higher torque to weight ratio, lower noise and better dynamic response for strategic and critical industrial applications. The development of HTS field coil is one of the main technological challenges in realizing the HTS synchronous machines, as it involves the selection of HTS tape, winding technology, handling of the HTS tape while winding on a winding machine and testing of the developed HTS coil at desired cryogenic temperatures. With advancements in HTS tape technology, recent 2G HTS tapes are offered with higher engineering current densities with respect to 1G HTS tapes even at higher magnetic fields. Hence, the replacement of 1G HTS field coils of previously designed 200 kVA HTS synchronous machine with 2G HTS field coils at the same operating cryo-temperature shows a potential to enhance its capacity to 350 kVA (more than 75% increase in machine output). In the present work the details of design, development and testing of a double pancake type 2G HTS field coil are presented for capacity enhancement of earlier 1G based 200kVA HTS synchronous machine.

高温超导（HTS）同步电机是紧凑轻巧的电机，具有更高的转矩重量比，更低的噪声和更好的动态响应，适合战略性和关键性工业应用。HTS励磁线圈的开发是实现HTS同步电机的主要技术挑战之一，因为它涉及HTS胶带的选择，卷绕技术，在卷绕机上卷绕时处理HTS胶带以及测试已开发的HTS线圈在所需的低温下。随着HTS磁带技术的进步，相对于1G HTS磁带，即使在较高的磁场下，最新的2G HTS磁带也具有更高的工程电流密度。因此，在相同的工作低温下，将以前设计的200 kVA HTS同步电机的1G HTS励磁线圈替换为2G HTS励磁线圈，显示了将其容量提高到350 kVA的潜力（机器输出增加了75％以上）。在本工作中，将介绍双煎饼式2G HTS场线圈的设计，开发和测试的详细信息，以增强基于1G的早期200kVA HTS同步电机的能力。