The Integration of YBACU3O6+X Coated Conductors into Magnets and Rotating Machinery

Abstract

The implementation of the 2 nd generation high-T c superconductors in power applications, such as electrical transformers, motors and generators requires superconducting wires that are superior to copper Litz wires at cryogenic temperatures in terms of losses in time-varying magnetic field, as well as in engineering current density. Another problem is to find a way to make practical coils and armatures out of flat tape-like conductors with low bending strain tolerance. We discuss several novel approaches to the construction of coils and armatures based specifically on the properties of coated conductors manufactured today.

Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

“…The generator vr is now determined. With the base curve X, we can now determine the rectifying developable surface Y corresponding to a rectangular tape with zero thickness according to (1).…”

“…After bending, the axial and transverse lines become space curves. The coordinate of each vertex can be determined based on (1). The curvature at vertex γ k of the discrete space curve can be determined based on the sine rule, i.e.,…”

“…The flat thin tape geometry, however, makes the bending along the thin edge of the REBCO tapes more difficult than along their broad surface. Therefore bending REBCO tapes is more constrained than bending round wires [1]. In addition, knowing the shape of the bent REBCO tapes allows to properly support the tapes against the electromagnetic force.…”