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电流ＰＷＭ控制是无刷直流机（ＢＬＤＣＭ）交流伺服系统的关键，常用电流跟踪型ＰＷＭ方式．本文提出恒频采样电流跟踪型ＰＷＭ方式，并对其开关策略进行了理论分析．前者为非线性的，环宽的准确控制较困难；后者为线性的，采样频率的控制则较容易．在实验系统上验证了理论分析的正确性，效果令人满意．
Current PWM control is the key to AC servo system of brushless DC machine (BLDCM), commonly used current tracking PWM mode. In this paper, constant-frequency sampling current tracking PWM mode is proposed, and its switching strategy is analyzed theoretically. The former is non-linear, accurate control of the ring width is more difficult; the latter is linear, and the sampling frequency control is easier. The correctness of the theoretical analysis is verified on the experimental system, and the result is satisfactory.