一种新的BLDCM无传感器梯形控制方法

doi:10.16180/j.cnki.issn1007-7820.2019.03.014

Abstract

Abstract:

Sensorless brushless DC motor is mainly controlled by the back-EMF method. However, a variety of disturbances in the control method will cause glitches and ripples in the waveform of Back-EMF,leading to erroneous judgment of the zero-crossing point of Back-EMF. In this paper, a sensorless BLDCM control method was proposed, and the proposed optimal function was used to filter the results of the Back-EMF detection. By analyzing the back EMF waveform, the optimal function was used to filter the glitches and ripples near zero-crossing point of the Back-EMF to avoid the misjudgement of the zero crossing point of the back EMF. Finally, the commutation time of the motor drive voltage was obtained, and the level of precise control of motor was improved. Experimental results proveed the correctness and feasibility of the new BLDCM sensorless trapezoidal control method.

Key words: BLDCM, sensorles, Back-EMF, zero crossing detection, glitch pulse, optimal function filtering

CLC Number:

TP13

WANG Xingfang,JIN Shiqun,XING Jinyu,HOU Shaoyang,WANG Zhe. A New Trapezoidal Control Method of Sensorless BLDCM[J].Electronic Science and Technology, 2019, 32(3): 67-71.

Figures/Tables 7

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References 16

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A New Trapezoidal Control Method of Sensorless BLDCM

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