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The structure and design method of an electric drive system for high power applications are presented. A multiphase permanent magnet brushless dc motor (PMBDCM) fed by a current source inverter (CSI) with thyristors acts as the kernel of the proposed electric drive system. Therefore, the system takes on advantages of both those two devices. The PMBDCM is simulated by FEM. The performance of power electronic converters (PEC) is analyzed analytically and simulated with MATLAB/Simulink. The simulation results show that the main circuit parameters have high influence on the system performance, so the parameters should be optimized by simulation, even by experiment. A prototype is build for verification. The experimental results are in good agreement with the simulation, which validates the feasibility of the proposed electric drive system as well as its design method.