摘  要：无刷直流电机广泛应用于现代生产生活中。传统的无刷直流电机是依靠霍尔传感器进行位置检测，这样的控制方式很难让电机的输出效率达到最优化，调速范围受限；而且霍尔传感器增加了制造成本，不能很好的适应工况严酷的场合。针对此种控制方式的缺点，现利用软件构造了无霍尔传感器的控制模型，并设计了相应的控制算法。理论分析和实验结果表明，该种算法具有启动噪声小，调速范围广，不受制于硬件，稳定性强，可用于稳速控制和变速控制等特点。
关键词：无刷直流鼓风机；电子换相；转子位置检测；过零点检测
Abstract:  Brushless DC motor is widely used in modern production and life. The traditional brushless DC motor detects the position via Holzer sensor. It is difficult to optimize the output efficiency and the speed range. Besides, using Holzer sensor will increase the manufacturing cost, and can′t adapt to the condition of harsh. This paper designed a control mode and a corresponding control algorithm via software without a Holzer sensor. Theoretical analysis and experimental results show that this control algorithm has the low noise and the wide speed range. Besides, this control algorithm is not in thrall to the hardware, and is especially suitable for speed-stabilization control and speed-variable control.
Key words:  brushless DC blower motor; electrically commutation; detection of the position; detection of the Zero-crossing