三相无刷直流电机(BLDCM)广泛应用在电驱动领域。传统星形连接和三角形连接的BLDCM绕组之间存在中性点，导致电机转矩脉动和可靠性较差。提出一种将开式绕组应用于三相BLDCM的系统，介绍了开式绕组BLDCM的电路拓扑结构和8种导通模式，分析了开式绕组三相BLDCM的电磁方程，建立开式绕组BLDCM的MATLAB仿真模型，仿真开式绕组BLDCM在8种导通模式下的电流、转矩、转速波形。加工样机并设计试验平台，测试开式绕组BLDCM在两相导通六状态运行模式下的性能，与星形连接BLDCM相比，开式绕组BLDCM调速范围更广、换相转矩脉动减少、机械特性曲线相近。

Brushless DC motors (BLDCMs) are widely used in electrical drive field. As neutral point exists in conventional star-connected and delta-connected BLDCM windings, torque ripples and low reliability may happen to the motor. The application of open winding to three-phase BLDCM system is proposed. The topology and 8 operation modes of open-winding BLDCM system are introduced. The electromagnetic equation of open-winding three-phase BLDCM is analyzed. A mathematical model of the open-winding BLDCM is built with MATLAB Simulink toolbox and the current, torque and speed of the motor under 8 operation modes are simulated. The prototype and the test system are designed. The performances of open-winding BLDCM in two-phase conduction and six-state operation mode are tested. The test results show that，compared with star-connected BLDCM, open-winding BLDCM has a wider speed adjustment range and less commutation torque ripple, exhibiting similar torque-speed characteristics.