中文摘要：

研究了无刷直流电机（BLDCM）直接转矩控制（DTC）策略。文章分析了无刷直流电机转矩特性，可以知道无刷直流电机的转矩可以通过转子磁链与定子电流之间的关系式估计得到，这不同于传统的永磁同步电机直接转矩控制的转矩估计方法。通过对二相导通方式下的无刷直流电机逆变器工作原理进行分析，得到了含有零矢量和不合零矢量的2个逆变器开关表以实现对转矩和磁链的控制。最后，在以上分析的基础上提出了2种新的无刷直流电机直接转矩控制数字实现方案，其中给出了2套不同的转矩并口磁链估计方法。新策略能有效控制无刷直流电机稳定运行，相对于传统的脉宽调制策略，它具有更快速的转矩动态响应性能。仿真结果进一步验证了所提策略的正确性和有效性。

英文摘要：

Sections 1 and 2 of the full paper explain in some detail our two new methods; their core consists of： （1） after analyzing the torque characteristics of BLDCM, we obtain the estimated torque equation involving rotor flux linkage and stator current; this estimated torque equation is different from that obtained with the traditional torque equation for DTC of permanent magnetic synchronous motor; （2） after studying the operating principles of the inverter used in BLDCM in the two-phase conducting mode, we obtain two switch tables for the one case of zero vector and the other case of nonzero vector. Section 3 presents two new digital implementation methods A and B for DTC of BLDCM （ see the block diagram given in Fig. 3 ）. Subsection 3.2 simulates our two new implementation methods; the simulation results, given in Fig. 4, show preliminarily that our two implementation methods can achieve good instantaneous torque control and reduce some torque ripples. Subsection 3.3 compares the simulation results obtained with our implementation method A with those obtained with the traditional pulse width modulation method; this comparison, presented in Fig. 5, shows preliminarily that our implementation method A has faster torque dynamic response performance and keeps the BLDCM in steadier operation state.