Magnetic shield effect for 8 MW high temperature superconducting synchronous motor

The airgap topology based High Temperature Superconducting (HTS) Synchronous motors have reduced size and weight compared to similar MW rating conventional motors. This is due to unprecedentedly higher magnetic flux densities produced by superconducting rotor pole coils in the airgap of the motor. These HTS synchronous motors have ferromagnetic material based annular magnetic shield over the airgap based stator windings. This magnetic shield not only shunts the working magnetic flux of the motor, but also plays a key role in determining the radial and tangential magnetic flux at airgap which is one of the key inputs for electrical design of HTS synchronous motor. In this paper, the effect of absence and presence of magnetic shield on airgap magnetic flux densities and on maximum perpendicular magnetic field on HTS tape of pole coil of an 8 MW HTS synchronous motor is studied with the help of FEM simulation.