›› 2016, Vol. 29 ›› Issue (3): 175-.

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  1. (上海理工大学 光电信息与计算机工程学院,上海 200093)
  • 出版日期:2016-03-15 发布日期:2016-03-18
  • 作者简介:丁亮(1990—),男,硕士研究生。研究方向:直流无刷电动机驱动与控制。

A Method of Driving Without Hall BLDC Based on Linear Fit BEMF

DING Liang,DING Xueming   

  1. (School of Optical-Electronic Information and Computer Engineering,University of Shanghai for Science and Technology,Shang 200093,China)
  • Online:2016-03-15 Published:2016-03-18



关键词: 无感BLDC, 反电势过零检测, 采样点, 线性拟合


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.

Key words: sensorless BLDC;back emf zero crossing point detection;sampling point;linear fitting


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