Turn-to-turn loss and mechanical behaviors of no-insulation layer-wound coil with active feedback control
The no-insulation high-temperature superconducting layer-wound coil has a long charging delay,which can be mitigated through proportional and integral(PI)active feedback controls.However,PI control requires a larger power supply current,potentially causing additional energy loss and mechanical damage.Thus,analyzing the electromagnetic and mechanical behaviors of the layer-wound coil with PI control is necessary.In this article,a hybrid numerical,combining the equivalent circuit network model with the finite element model,is used to calculate the turn-to-turn loss and mechanical response of the coil with PI control.The numerical calculation demonstrates that the layer-wound coil with PI control requires a larger power supply and generates higher turn-to-turn loss energy and hoop stress compared with a coil without PI control.Higher stress is generated in the coil with PI control,while the difference in the hoop stress is relatively smaller than that in the turn-to-turn loss.In a background field of 10 T,the difference in the hoop stress is 20 MPa.The loss of energy increases rapidly with increasing number of turns in the axial direction.Thus,a coil with fewer axial turns is preferred to reduce the turn-to-turn loss and hoop stress.In addition,increasing the charging time can decrease the loss of energy and peak stress.
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