目的
磁轴承自传感是一个关联磁悬浮转子动态特性的 机电磁多物理场耦合问题。研究自传感磁轴承 (AMBs)机电磁耦合机理与磁阻模型,对于其 工作性能提升具有重要意义。当前基于脉宽调制 (PWM)开关功放的磁轴承自传感方法,可缩小 轴承几何尺寸,提高电气效率和转子动态性能, 但存在传感精度不高、路径过长、稳定性较低等 问题。针对上述问题,本文旨在提出一种基于 PWM 开关频率同步采样的离散电流估计 (SS-DCE)方法,以缩短自传感路径,改善传感 精度,以及提高磁轴承动态性能与工作稳定性。
方法: 1. 通过分析两个相邻离散电流的数学关系,建立 转子位移解析表达式;2. 基于SS-DCE 方法,结 合位置式双闭环控制技术,并借助物理传感器实 现对AMBs 自传感过程的关键参数测试和评估 验证。
结论:1. 磁轴承转子位移是一个关于电压/电流的非线性 函数,而利用PWM 开关功放纹波特性可使其线 性化,进而缩短自传感物理路径,提高工作稳定 性;2. 自传感路径的长度由滤波器数量和算法复 杂度决定,与相位滞后紧密相关;3. 与模拟/数字 滤波幅度解调法相比,基于SS-DCE 的自传感方 法的静态精度更高,稳定裕度更大,且具有较好 的升速过程频率特性。
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Xiong-xin HU designed the research. Fang XU processed the corresponding data. Xiong-xin HU wrote the first draft of the manuscript. Da-peng TAN helped to organize the manuscript, and revised the final version.
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Xiong-xin HU, Fang XU, and Da-peng TAN declare that they have no conflict of interest.
Project supported by the National Natural Science Foundation of China (No. 51775501) and the Zhejiang Provincial Natural Science Foundation of China (No. LR16E050001)
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Hu, Xx., Xu, F. & Tan, Dp. A synchronous sampling-based direct current estimation method for self-sensing active magnetic bearings. J. Zhejiang Univ. Sci. A 21, 401–405 (2020). https://doi.org/10.1631/jzus.A2000067
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DOI: https://doi.org/10.1631/jzus.A2000067