Abstract
When a coil or a winding is made, the superconducting tapes must be bent to differentcurvatures. Bending of high temperature superconducting (HTS) tapes can result indegradation of the critical current density and thus increase the AC losses of the tapes.Therefore, the effects of bending strain on the critical current and AC loss should beconsidered in the design of high temperature superconducting apparatus. In this paper, thedependence of critical current and AC loss on the bending diameter of the superconductortape was experimentally investigated. The diameters of the curved tape were varied from110 to 36 mm. AC loss measurements were taken at 77 K, 50 Hz. Analysis of the bendingstrain effects on the critical current and AC loss are presented. An expression describingthe dependence of AC losses on bending strain is proposed by modifying Norris’ formula.The experimental results are presented and compared with the calculated values.
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