【作者】 黄峰；

【导师】 葛研军；

【作者基本信息】 大连交通大学 ， 控制理论与控制工程， 2009， 硕士

【摘要】 动力磁悬浮轴承(Power Magnetic Bearing简称P-MB),也称为无轴承电机,是近年来提出的一种新型电动机,在原理上是以普通的电机为基础,在定子上安装有两套不同极数的绕组,使其电磁铁提供的磁场不仅可产生支承转子的径向力,而且还可产生驱动转子的扭矩。由于其具有结构简单、制造方便、可靠性高、适合超高速运行等特点,目前已成为电机研究领域中的一个新热点。目前工业领域中应用广泛的大多是传统的磁悬浮轴承,需要5~10个非接触式位移传感器来检测转子的位移,由于位移传感器的存在,使磁悬浮轴承的轴向尺寸变大、系统的动态性能及可靠性降低。又由于机械结构上的限制,使传感器不能装在磁悬浮轴承的中间,这样就造成系统的控制方程相互耦合,系统的控制器设计复杂。此外,由于位置传感器的价格较高,从而导致整个磁悬浮轴承系统的价格偏高,大大限制了它在工业上的推广应用。本文基于动力磁悬浮轴承的基本运行原理,分析了计及转子偏心的悬浮力表达式,推导出悬浮绕组自感与转子径向偏移量之间的数学模型;基于动力磁悬浮轴承径向位移自检测运行原理,设计出采用高频信号的转子径向偏移量的检测电路;分析了转子偏心时悬浮绕组与转矩绕组的磁链关系,推导出基于U-I模型的悬浮绕组独立控制算法;采用DSP(TMS320LF2407A)作为主控芯片,设计出动力磁悬浮轴承的径向位移自检测控制系统。更多还原

【Abstract】 Power Magnetic Bearing, also known as Bearingless Motors, has been proposed as a new type of motor in recent years. In principle, it is based on the general Motors. Two different sets of windings are installed on the stator, which enable the magnetic field provided by electromagnets not only to produce the radial force to support the rotor, but also to drive the rotor. Because of its simple structure, easy manufacturing, high reliability, suitability for ultra-high-speed operation, etc., the current research in the motor field has become a new hot spot.At present, the traditional magnetic bearings are widely used in industries. To detect the rotor displacement, 5 to 10 non-contact displacement sensors are needed. The existence of displacement sensor will increase the axial size of magnetic bearing system, and badly affect the dynamic performance and reliability. Also as a result of structural limitations, the sensor can not be installed in the middle of magnetic bearings, which makes the equations of the system coupling, and the design of system controller becomes more complicated. In addition, the high price of the positioning sensor results in the high price of the entire system of magnetic bearing, which will greatly limit its industrial applications.In this thesis, the expression of the levitation force considering rotor eccentricity is analyzed, and the mathematical modle between the self-inductance of levitation windings and radial offsets is derived, basing on the operating principles of the power magnetic bearing; the displacement detection circuit using high-frequency signals injectiong method is designed, basing on the radial displacement self-sensing principle of the magnetic bearing; the magnetic linkage relationship between the levitaton windings and torque windings, and the independent control algorithm of the levitaton windings based on U-I modle is given; the radial displacement self-sensing control system of the power magnetic bearing is designed, using DSP(TMS320LF2407A) as the main control chip.更多还原