Experimental Ball Bearing Impedance Analysis Under Different Speed and Electrical Conditions
Experimental Ball Bearing Impedance Analysis Under Different Speed and Electrical Conditions
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DOI：
10.1109/tdei.2023.3271958
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发表时间：
2023-06
影响因子：
3.1
通讯作者：
D. De Gaetano;Wenjun Zhu;Xiangyu Sun;Xiao Chen;A. Griffo;G. Jewell
中科院分区：
文献类型：
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作者：
D. De Gaetano;Wenjun Zhu;Xiangyu Sun;Xiao Chen;A. Griffo;G. Jewell
球轴承通常用于逆变器驱动的电机中，在那里它们可能会受到高频共模电流的影响，从而加速它们的退化。本文研究了轴转速、电压幅值和频率对轴承阻抗的影响，包括在放电过程中，目的是提供一种经过实验验证的方法，将其高频行为建模为操作条件的函数。这种分析可以帮助改进模型的发展，以预测电力驱动器中的轴承电流。一个专门的实验装置，完全与地面隔离，提出。它提出了一个绝缘板和螺栓，使轴承与支撑（连接到地面）绝缘，一个绝缘耦合，使dyno与轴承绝缘，和绝缘片，使电刷保持器与地面绝缘。不同的电压和频率振幅之间的内部和外部轴承滚道的几个轴的速度。给出了测量的阻抗幅值和相位、电流和电压。由于大量的数据，提出了一种统计方法来研究轴承的行为。一个简单的轴承模型提供了一个解释的实验测量。分析表明，电压幅值和频率对球轴承的放电有显著影响，特别是在一定的轴转速下，击穿状态下的阻抗幅值和相位受到强烈影响。
Ball bearings are commonly used in inverter-driven electrical machines, where they can be subject to high-frequency common-mode currents that accelerate their degradation. This article investigates the impact of shaft speed, voltage amplitude, and frequency on the bearing impedance, including during electrical discharges, with the aim to provide an experimentally validated approach to model their high-frequency behavior as a function of operating conditions. This analysis can help the development of improved models to predict bearing currents in electric drives. A dedicated experimental setup, completely isolated from the ground, is presented. It proposes a dielectric plate and bolts to insulate the bearing from the support (which is connected to the ground), a dielectric coupling to insulate the dyno from the bearing, and dielectric sheets to insulate the brush holder from the ground. Different voltage and frequency amplitudes are applied between the inner and outer bearing raceways for several shaft speeds. The measured impedance amplitude and phase, currents, and voltages are presented. Due to a large amount of data, a statistical approach is proposed for studying the behavior of the bearing. A simple bearing model is presented to provide an interpretation of the experimental measurements. The analysis shows that the voltage amplitude and frequency have a significant impact on electrical discharge in ball bearings, especially for certain shaft speeds strongly affecting the impedance amplitude and phase during the breakdown state.