Abstract: Direct torque control with duty ratio（DTC-DR） schemes of five-phase permanent-magnet synchronous machines（PMSMs） are very simple and can achieve fast dynamic performance. However, low-order harmonic components of stator currents are very serious. Virtual voltage vectors based direct torque control with duty ratio（V3-DTC-DR） scheme had been proposed to eliminate the low order harmonics successfully, but it led to the utilization reduction of dc-link voltage, and the speed regulation range was limited. The aforementioned two schemes cannot achieve the improvement of dc-link voltage utilization, and eliminate the low order harmonic simultaneously. In order to solve this problem, a new type of direct torque control with the optimized duty ratio（DTC-ODR） scheme was proposed, which can realize the perfect steady-state performance and the low-order harmonic elimination. In addition, the proposed method can improve the utilization of DC-link voltage by about 17%, compared with V3-DTC-DR, and as a result, the speed regulation range was improved. Finally, a performance comparison of the proposed DTC-ODR, DTC-DR and V3-DTC-DR schemes had been presented on the five-phase PMSM drive experimental platform. The experimental results had verified the feasibility and effectiveness of the proposed scheme.