Analytical models for a mechanical strain of a modified D-shaped toroidal coil for 1 kWh experimental SMES

Several interesting characteristics in the strain force measurement of the supporting structure of the modified D-shaped toroidal coil for 1 kWh experimental SMES (ESK) have been observed. A simple analytical model is developed to simulate the measured characteristics. With this model, the mechanical behavior of the superconductor in the coil is studied. Calculated results based on this model show good agreement with the observed characteristics. Mechanical losses of the superconducting coil are also discussed using this model.