关键词: 无刷直流电机, 开绕组, 直接转矩控制, 两相导通, 电压矢量

Abstract: The open winding brushless direct current motor ( BLDCM) based on direct torque control ( DTC) has the advantages of high operating efficiency, diverse voltage vectors, and simple control structure, making it very suitable for the industrial field. A corresponding mathematical model based on the common DC bus open winding BLDCM control topology was established, and theoretical analysis and classification of the characteristics of voltage vectors under the topology were conducted. Voltage vectors with non zero voltage amplitude were classified into three categories: large, medium, and small. The analysis results indicated that under the same operating conditions, the torque change rate was the highest under the action of a large vector, the torque change rate was the lowest under the action of a small vector, and the middle vector was between the two. The simulation results verifed the correctness of the theoretical analysis and the feasibility of the control method.

Key words: brushless DC motor ( BLDCM ), open winding, direct torque control ( DTC ), two phase conduction, voltage vector