SUPERCONDUCTING LEVITATED STEPPING MOTOR WITH NEW DRIVING METHODS

Abstract

A magnetically levitated stepping motor using high T_c superconductor has been studied. The levitated stepping motor consists of a cylindrical rotor with superconductors and a stator with eight electromagnets. The rotor measures 10 mm in diameter, 46 mm in length, and 18 g in mass. The superconductors of the rotor are field-cooled in liquid nitrogen with various field-cooling currents. The levitated rotor is driven by an eight-phase excitation with various driving currents. The rotation angle by each step is 90 deg. The rotor spins as the excitation phase shifts one by one. This paper discusses the dynamics of the motor driven by a new driving method.