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首页> 外文期刊>IEEE Transactions on Magnetics >Modeling Induction Motors Under Mixed Radial–Axial Asymmetry of the Air Gap Produced by Oil-Whirl Fault in a Sleeve Bearing
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Modeling Induction Motors Under Mixed Radial–Axial Asymmetry of the Air Gap Produced by Oil-Whirl Fault in a Sleeve Bearing

机译：套筒轴承中油涡旋故障产生的气隙的混合径向-轴向不对称的感应电动机建模

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摘要

High-power rating three-phase squirrel cage induction motors (SCIMs) may be equipped with sleeve bearings (SBs). Oil-whirl fault (OWF) is an important fault mode of the SBs, which can lead to their serious damage. On-line condition monitoring is recommended to detect possible incipient OWFs in the SBs before total failure of them and catastrophic stop of the machine. The OWF usually happens only in one of the motor SBs and introduces time-variant mixed radial-axial asymmetry to the air gap distribution. To study the SCIM performance under the OWF in one of its SBs, this paper proposes an analytical modeling and simulation approach. Multiple coupled circuit modeling along with the 2-D modified winding function theory is used for this purpose. The modeling and simulation results show novel harmonic components in the stator line currents, as well as the self-inductances of the stator windings due to the fault. The latter harmonics can be used as indices for diagnosing the bearing OWFs as well. Regarding the sensitivity to the fault severity and robustness against the load level change and the mains voltage unbalance degree change, simulation-based studies are used to determine the most appropriate inductance harmonic as the OWF index.
机译：大功率额定三相鼠笼式感应电动机（SCIM）可能配有套筒轴承（SBs）。油涡流故障（OWF）是SB的重要故障模式，可能会导致严重损坏。建议在线状态监测，以在SB完全故障和机器灾难性停止之前检测出SB中可能存在的OWF。 OWF通常仅在电动机SB之一中发生，并将时变混合径向-轴向不对称性引入气隙分布。为了研究OWF在其SB之一中的SCIM性能，本文提出了一种分析建模和仿真方法。为此，使用了多重耦合电路建模以及2D修改的绕组函数理论。建模和仿真结果表明，定子线电流中存在新的谐波分量，以及由于故障而导致的定子绕组的自感。后面的谐波也可以用作诊断轴承OWF的指标。关于对故障严重性的敏感性以及对负载水平变化和电源电压不平衡度变化的鲁棒性，基于仿真的研究用于确定最合适的电感谐波作为OWF指标。

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