摘要
对于以反电势过零点判断来控制无感直流无刷电机的方案,在驱动的低速阶段,由于反电动势值过小,难以准确地检测过零点,针对该问题,提出一种新的低速反电势过零检测方法。该方法在低速采用线性拟合代替硬件判断反电势过零点,并在PWM_OFF时刻进行反电势采样,提高了低速阶段的控制性能,通过Matlab的Simulink仿真证明该方案切实可行。
As for the scheme based on back EMF zero crossing detecting to drive the sensorless brushless dc motor,it is difficult to accurately detect zero crossing points in the drive of low speed stage because the back EMF value is too small. This paper puts forward a new method of the back EMF zero crossing detection at low speed. This method drives by linear fitting instead of hardware to determine the zero crossing at low speed,and the back EMF is sampled in pwm_ off time,thus improving the control performance of low speed stage. Matlab simulink simulation proves that the scheme is feasible.
出处
《电子科技》
2016年第3期175-177,182,共4页
Electronic Science and Technology
关键词
无感BLDC
反电势过零检测
采样点
线性拟合
sensorless BLDC
back emf zero crossing point detection
sampling point
linear fitting
