Combined superconducting magnetic bearing based on stacks of composite HTS tapes and non-closed HTS tapes windings

Abstract

This paper presents the concept of significant improvements a previously developed magnetic bearing based on non-closed windings made of composite HTS tapes. The magnetic bearing is improved, firstly, by altering the rotor's magnetic field configuration and increasing the number of stator superconducting windings, and, secondly, by incorporating stacks of composite HTS tapes into the stator design. Using numerical simulation methods, passed experimental verification, the load characteristics of the upgraded HTS bearing are predicted. It is demonstrated that using of the Halbach magnetic assembly and additional HTS elements (HTS tapes stacks) not only increases the vertical restoring force but also enhances the radial levitation force component. The relative increase in levitation force per unit superconductor length in the new design is about 20% for the vertical levitation force and about 16% for the radial levitation force. In addition, it has been shown that the use of HTS tapes stacks has a small effect on the vertical force of the bearing and is ineffective in enhancing the support function, but makes a strong contribution to the radial stability of the device and allows the rotor position to be stabilized.