[Objective] Permanent magnet shielded motors are widely used in fields that require high sealing and stability. These motors are typically powered by inverters, but the time harmonic currents generated by the inverter can lead to a deterioration in motor performance. Therefore, an in-depth study of the impact of time harmonic current on motor performance is essential for optimizing motor design and ensuring stable operation when powered by inverters. [Methods] A finite element method was employed to model a permanent magnet shielded motor with a rated power of 1.5 kW and a rated speed of 9 000 r/min. This study compared and analyzed the eddy current losses in the permanent magnets, shielded sleeve losses, torque characteristics, efficiency, and power factor of the motor under excitation from 5th and 7th order time harmonic currents with different amplitudes. Different materials for the shielded sleeve were also considered. [Results] Simulation results showed that the injection of harmonic excitation significa