一种基于电机虚拟中性点的无刷直流电机无位置换相误差闭环校正方法

发布时间：2018-06-12 22:11

本文选题：无位置传感器 + 换相　；参考：《电工技术学报》2017年01期

【摘要】：针对无刷直流电机无位置传感器换相存在换相误差的问题,提出一种基于虚拟中性点的无刷直流电机无位置换相误差闭环校正方法。将虚拟中性点与电机驱动电压中性点之间的电压差引出,并对该电压差信号与换相误差之间的关系进行了分析。基于此分析,在换相点前后对该电压差信号采样,两次采样结果求差后得到换相误差控制的反馈量,以该反馈量趋近于零目标建立基于PI的闭环校正回路。实验表明,该方法对换相误差具有很强的鲁棒性,可快速补偿外界因素对换相时间的影响,对于15°滞后角,在1 500 r/min转速下仅需70步,在3 000 r/min转速下仅需40步就能使换相点收敛至准确位置。实验结果验证了该方法的有效性。
[Abstract]:Aiming at the problem of commutation error in sensorless commutation of brushless DC motor, a closed loop correction method of position commutation error for brushless DC motor based on virtual neutral point is proposed. The voltage difference between the virtual neutral point and the drive voltage neutral point of the motor is derived, and the relationship between the voltage difference signal and the commutation error is analyzed. Based on this analysis, the voltage difference signal is sampled before and after commutation point, and the feedback quantity of commutation error control is obtained after the difference between the two sampling results is obtained, and the closed loop correction loop based on Pi is established with the feedback quantity approaching to zero target. Experiments show that the method is robust to the commutation error and can compensate for the influence of external factors on the commutation time quickly. For 15 掳lag angle, only 70 steps are needed at 1 500 r/min rotational speed. The commutation point can converge to the correct position in only 40 steps at 3 000 r/min rotational speed. The experimental results show that the method is effective.
【作者单位】：新型惯性仪表与导航系统技术国防重点实验室(北京航空航天大学);惯性技术国防科技重点实验室(北京航空航天大学);
【基金】：国家自然科学基金项目资助(61403015,61203112)
【分类号】：TM33

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