Charging Test of a YBCO Racetrack Coil for an Synchronous Motor with a Linear-Motor Type Flux Pump

Superconducting flux pumps can provide large currents to the superconducting magnets without contact and reduce the heating loss of mental current leads between cryogenic environment and room environment, which will reduce cooling losses and improve the working efficiency of high-temperature superconducting (HTS) motors. It can be used as a DC power resource for many applications. In this paper, the experimental platform of synchronous motor with a linear-motor type flux pump, which has been under construction, and the no-insulation (NI) racetrack coil manufactured by our laboratory winding machine with YBCO tape have been designed. Based on the linear-motor type flux pump that has been proposed in our laboratory, we have miniaturized it in volume and used the linear-motor type flux pump as a DC power supply to measure the magnetization of NI racetrack coil without contact. The charging experiment of the linear-motor type flux pump using the constructed YBCO racetrack coil was conducted at 77K. The experimental results will optimize the HTS flux pump applied to the brushless HTS synchronous motor.