无刷直流电机直接转矩控制的新型零矢量研究

Study on New Zero Voltage Vector in Direct Torque Control of Brushless DC Motor

在现有的无刷直流电机两相导通直接转矩控制研究中,常定义所有开关管关断为零矢量。这种定义方式虽然简单,却造成较大的转矩脉动。提出一种新型零矢量,分别在电动与发电状态下分析其对转矩的影响,指出新型零矢量具有降低稳态转矩脉动的效果,并且能方便地实现电机的4象限运行。仿真结果验证了理论分析的正确性。

In direct torque control system of brushless DC motor,the voltage vector is often defined as zerovoltage vector while all power switches are off.This definition is simple,but cause big torque ripple.A new zerovoltage vector was presented.The influence of zero voltage vector on torque in dynamic state and generated state wasanalyzed.That the new zero voltage vector which has lower steady-state torque ripple was pointed out,and couldconveniently realize four quadrant operation of the motor.The simulation results verify the validity of the theoryanalysis.