一种新无刷直流电机无位置传感器零起动方法

目前,无刷直流电机(BLDCM)的无位置传感器多采用3段式起动法,但此起动法存在一些不足,特别是在电机负载较大的情况下,电机起动成功率较低,其关键问题在于检测电路无法在电机低速运行时准确地检测到转子的位置信号,电动机无法顺利切换到自控同步运行.此处采用反电动势过零点检测方法,通过改进反电动势检测电路和无位置传感器的起动方法,结合软硬件进行相位移补偿.提出一种新的:BLDCM无位置传感器零起动方法,并设计了一款新型无位置传感器控制器.实际运行证明,改进的反电动势检测电路在电机全速范围内均能稳定可靠工作,电机在大负载下起动成功率接近100%,从而大大提高了电机的运行性能.

A New Method of BLDCM Sensorless Zero Start

At present,the brushless DC motor sensorless is mostly based on the three-step start method,in which there are some shortcomings,especially in the case of large motor loads,it tends to be lower level to successfully start.The key reason is that the detection circuit can not effectively run and accurately detect the rotor position signal when the motor runs slowly,so the motor can not successfully switch to the self-controlled synchronous operation.A new method of BLDCM sensorless zero start is brought forwa...