Influence of Flux Pinning on the Open-Circuit Voltage of a Dynamo-Type High-Tc Superconducting Flux Pump

Flux pumps can be exploited to energize superconducting coils without physical contacts, making them an attractive option for practical applications, such as closed loop magnets. However, the physical mechanism of the dynamo-type flux pump has yet to be fully understood. This article investigated the effect of pinning performance on the open-circuit voltage (
$ V_{\text{oc}}$
) of a dynamo-type flux pump. We conducted experiments to measure and compare the
$ V_{\text{oc}}$
induced in high-temperature superconducting (HTS) tapes prepared using metal-organic deposition (MOD) and metal-organic chemical vapor deposition, as well as in MOD tapes with varying doping levels of BaZrO3 (BZO) nano-particles. We found that HTS tapes with lower flux pinning potential exhibited higher
$ V_{\text{oc}}$
. In addition, we employed a 2-D numerical model based on the coupled
${\mathbf{H}}$
-
${\mathbf{A}}$
formulation to reproduce the experimental results. The rectification behavior during the dynamical process has been realized with the model and the influence of flux pinning related parameters discussed. These outcomes can serve as a guide for the device enhancement.