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锥形磁悬浮轴承的建模与解耦控制

, PP. 153-160

Keywords: 锥形磁悬浮轴承,线性化,建模,解耦控制

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Abstract:

磁悬浮轴承的标准结构包括两个径向轴承和一个轴向轴承,也可以将两个径向轴承做成锥形使其能够提供轴向悬浮力,从而省去轴向轴承,减小磁悬浮轴承的轴向尺寸,并使系统结构简化。但仅仅依靠两个锥形径向轴承使转子悬浮,在磁轴承的轴向和径向间会存在很强的耦合,使系统的建模和控制都变得更复杂。对一台自行设计的锥形磁悬浮轴承提出一种解耦控制。首先采用磁路法建模,得到原始的非线性模型。然后对非线性模型进行线性近似,并通过引入输入与输出的线性变换使系统解耦,推导出5个单输入单输出的解耦控制模型,分别对应于转子的5个运动自由度。最后,针对这5个被控对象分别设计控制器,并对解耦控制进行仿真分析和实验验证。结果表明,锥形磁悬浮轴承可以通过对其输入和输出进行简单的代数变换实现有效的解耦。

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