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The analog switching power amplifier of magnetic bearings have some shortages,such as high power consumption.

开关功率放大器是磁悬浮轴承的重要执行环节，一般为模拟电路设计。

To overcome these drawbacks, the application of current mode tri-state modulation technology to the switching power amplifier for magnetic bearings is proposed, as well as its special advantages.

文中首先分析了电流纹波对磁轴承系统的影响，接着分析了电流两态调制技术本身的固有不足及电流三态调制技术在磁轴承开关功放应用中的优势。

The research results have shown that the configuration of the magnetic bearing reduces overall system size, and has high efficiency. The axial and radial suspension forces have great linearity. The symmetrical characteristic strenuously, and movement of every degree of freedom around balanceable position has no coupling and the control flux of every degree of freedom is independent. It is beneficial to simplify and design the controller and the circuit power amplifier. The magnetic bearings operate stably with decentralized PID controllers.

研究结果表明：这种磁轴承结构合理紧凑，效率高；磁轴承轴向、径向悬浮力具有较好的线性和对称性，有利于控制器及功放电路的简化与设计，并获得良好的拉制性能；各自由度运动和磁路几乎没有耦合，采用分散独立的PID控制器实现了磁轴承的稳定工作。

By means of finite element analysis, modal analysis for axis systemsupported by magnetic bearings is accomplished.

利用有限元法，对所设计磁力轴承转子系统进行了模态分析，得出该系统的动力学特性参数。

Based on the design principles andmethods of axis system supported by active magnetic bearings, an axis systemhas been designed by the author.

阐述了主动磁力轴承主轴系统的设计原则与方法，并设计了一套磁力轴承主轴系统。

In this thesis, the Hinf robust loop shaping control of the magnetic bearings for a moment wheel system is investigated.

本文的研究对象为控制力矩陀螺磁悬浮系统，着重研究整个系统的鲁棒Hinf回路成形控制。

Jiashan, Kinmen and Matsu Composite Bearing Co., Ltd. is specialized in producing self-lubricating bearings business.

嘉善金马复合轴承有限公司是专业生产自润滑轴承的企业。

McGill Offers The Industry's Broadest Line of Precision Bearings..

麦吉尔提供业内最广泛的路线，精密轴承。。

The company was founded in 1997, is a professional manufacturer of micro-, small deep groove ball bearings of the private joint-stock enterprises.

公司创建于1997年，是一家专业生产微、小型深沟球轴承的私营股份制企业。

Is a professional production of micro and small bearings manufacturers.

是一家专业生产微小型轴承的厂家。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。