摘  要：绝大多数的无位置传感器无刷直流电机位置检测方法都是基于全桥驱动电路进行设计的。半桥驱动电路结构简单、体积小、功耗低、易于控制，亦得到了广泛应用。该文针对带有电压斩波器的半桥驱动电路，给出了一种改进的端电压反电势位置检测方法，该方法巧妙地解决了PWM开关干扰和换相干扰对位置检测的影响，无需对端电压进行滤波或采样保持，直接通过电压比较和逻辑处理即可检测位置信号，无滤波器延时，检测精度高，实现简单。在Matlab环境下建立了仿真模型，验证了该方法的可行性和有效性。
关键词：无刷直流电机; 半桥驱动; 位置检测

Abstract: Most of the current sensorless control schemes for BLDC (Brushless DC) motor are based on full-bridge driver. However, half-bridge driver draws a lot of attention due to its simpler structure, smaller occupied volume, lower power loss, easier control scheme and lower production cost, and it has been successfully utilized in several applications. This paper presented novel designs for sensorless BLDC motor based on half-bridge driver circuit with buck modulator. This method has high detection accuracy without filter delay, and is very easy for implementation. The simulation model built in Matlab environment further pointed out the feasibility and validity of this method.
Key words: BLDC motor; half-bridge driver; position detection