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Recently development of the new concept motor for EV/HEV becomes very active. Due to the demands of expanding the high efficiency and controllable torque area, we proposed a novel Claw Pole Type Half-Wave Rectified Variable Field Flux Motor (CP-HVFM). This motor is simple and robust brushless structure and has variable field flux performance. This paper introduces the principle of variable field flux excitation method. And we evaluate an influence of the variable field flux on the torque and efficiency characteristics.