This article investigates the influence of two nonideal factors on zero-crossing-point-detection-based sensorless control of high-speed brushless dc (BLDC) motor, i.e., asymmetric machine parameters and the resistance tolerance of back electromotive force (EMF) measurement circuit. Influenced by the machine parameter asymmetry, the back EMF envelopes will shift horizontally from its ideal position. Furthermore, the acquisition accuracy of back EMF is limited by the resistance tolerance of measurement circuit. Inaccurate acquisition of back EMF will result in vertical deviation of the envelopes. These two nonideal factors decrease the commutation accuracy and deteriorate the control performance. In order to suppress the commutation errors, an adaptive threshold correction strategy, including horizontal and vertical corrections is proposed for eliminating the influence of these two nonideal factors, respectively. In addition, the proposed correction method does not depend on any parameters of the machine or the measurement circuit. Finally, the theoretical analysis and the proposed correction method are verified by experiment on a 54 000 r/min high-speed BLDC drive platform.

中文翻译：

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考虑过零点偏差的无传感器高速无刷直流驱动自适应阈值校正策略

本文研究了两个非理想因素对高速无刷直流 (BLDC) 电机基于零交叉点检测的无传感器控制的影响，即非对称机器参数和反电动势 (EMF) 测量电路的电阻容限. 受机器参数不对称的影响，反电动势包络将从其理想位置水平移动。此外，反电动势的采集精度受到测量电路电阻容差的限制。反电动势的不准确采集将导致包络的垂直偏差。这两个非理想因素会降低换向精度并降低控制性能。为了抑制换向误差，自适应阈值校正策略，为分别消除这两个非理想因素的影响，提出了包括水平和垂直校正的方法。此外，所提出的校正方法不依赖于机器或测量电路的任何参数。最后，通过在 54 000 r/min 高速 BLDC 驱动平台上的实验验证了理论分析和提出的修正方法。