To research the performance of the variable frequency speed regulation system used the space vector modu-lation strategy for permanent magnet synchronous motor ( PMSM) with the propeller load, through combining the analysis of direct torque control ( DTC ) and propeller load characteristic theory with the open water curve of the propeller, it obtained the function relationship for thrust coefficient Kp and torque coefficient Km with the advance speed ratio /, respectively. It proposed the calculation method of thrust and torque coefficient and established the PMSM DTC simulation model with propeller load. The simulation results show that the response time of the motor dynamic speed is fast in DTC system, and the electromagnetic torque is equal to the load torque produced by rotating propeller when the motor speed in steady states. Compared with the measured motor's operation data, the simulation motor torque value is consistent with the measured data in different rotating speeds and verify the validity of the model.%为了研究空间矢量调制策略对大功率永磁同步电机在螺旋桨负载特性下变频调速性能的影响,通过对直接转矩控制变频调速和螺旋桨负载特性理论的分析,结合螺旋桨敞水特性曲线,得到螺旋桨推力系数Kp和扭矩系数Km分别与进速比J之间的函数关系.提出了推力系数和扭矩系数的计算方法,建立了螺旋桨负载和永磁推进电机直接转矩控制的仿真模型.仿真结果表明,直接转矩控制系统中永磁推进电机转速动态响应快,转速稳定后电磁转矩与螺旋桨旋转产生的负载转矩相等.与实测电机运行数据比较可知,不同转速下仿真得到的电机转矩值与实测值相一致,验证了该模型的有效性.
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