Research on Sensorless Control Technology of Brushless DC Motor with Delta Winding for Cooling Fan in Electric Reactor

2023 IEEE International Conference on Power Science and Technology (ICPST) Pub Date : 2023-05-05 DOI:10.1109/ICPST56889.2023.10165413

Jiabao Dong, Z. Hao, W. Hu

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Abstract

The cooling fan of the electric reactor is based on the brushless DC motor with delta winding and the commutation point of sensorless drive is 60° after the back electromotive force (EMF) passes through zero point. In this paper, the mechanism of back EMF zero-crossing detection method for delta winding is deduced and the starting problem at low speed and the commutation error caused by diode freewheeling at high speed and large current are analyzed. On this basis, combining I/f constant current up-frequency starting and the back EMF zero-crossing detection method and performing the commutation angle compensation, a full-speed range sensorless control strategy is proposed. Based on this strategy, an electric reactor cooling fan with rated speed of 4750(r/min) and rated power of 800W under low voltage and large current conditions is verified by simulations and experiments. The results show that the sensorless control strategy proposed can ensure the stable operation of the cooling fan of the electric reactor in the full-speed range, which has good feasibility and robustness.

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电抗器冷却风扇三角绕组无刷直流电机无传感器控制技术研究

电抗器冷却风扇采用三角绕组无刷直流电动机，反电动势通过零点后无传感器驱动换相点为60°。推导了三角绕组反电动势过零检测法的原理，分析了低速起动问题和高速大电流下二极管自由转动引起的换相误差。在此基础上，结合I/f恒流上频启动和反电动势过零检测方法，进行换相角补偿，提出了一种全转速范围无传感器控制策略。基于该策略，对低压大电流工况下额定转速4750(r/min)、额定功率800W的电抗堆冷却风扇进行了仿真和实验验证。结果表明，所提出的无传感器控制策略能够保证电抗堆冷却风扇在全速范围内的稳定运行，具有良好的可行性和鲁棒性。

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来源期刊

2023 IEEE International Conference on Power Science and Technology (ICPST)

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