【作者】 程文杰；

【导师】 葛研军；

【作者基本信息】 大连交通大学 ， 机械制造及其自动化， 2009， 硕士

【摘要】 动力磁悬浮轴承也称为无轴承电机,其定子由两套绕组——即输出转矩的转矩绕组和提供悬浮力的悬浮绕组组成。虽然普通交流电机的绕组理论已很成熟,但目前仍没有确定动力磁轴承两套绕组每槽导线数的相关理论依据。分析比较了动力磁轴承和普通交流电机的性能特点,总结出动力磁轴承定子结构设计的基本步骤。利用能量守恒原理,推导出两套绕组每槽导线数之间的匹配关系,并计算出两套绕组的功率。利用所得的两套绕组每槽导线数之间的关系,将一台普通异步电机改制成动力磁轴承,并对其磁场进行了有限元分析。结果表明:由原电机电磁参数决定的定子尺寸限制了动力磁轴承功率的提高。为此,提出增加原电机轭高以弥补功率损失。通过理论计算和电磁场有限元分析表明:改进后的动力磁轴承具有较高的气隙磁密,意味着提高了动力磁轴承的输出功率。结合轴向磁轴承定子电压平衡方程、推力盘的运动方程及磁路基本定律,推导出轴向磁轴承在差动状态下电磁力数学模型与转子轴向运动控制方程。并设计了以定子电压作为控制变量的闭环传递函数框图。为控制电路的设计和控制参数的调节奠定了理论基础。为测试轴向磁轴承的力学性能及控制系统,设计了一套轴向磁轴承的实验加载平台。该平台包括轴向磁轴承的支撑装置和施力装置,并用有限元法分析了该平台的可靠性。更多还原

【Abstract】 Power Magnetic Bearing is also called Bearing-less Motor and its stator is composed of torque winding which outputs torque and suspension winding which outputs magnetic levitation force. Although the winding theory about general AC machine is mature, there is lack of relevant theoretical basis that can confirm the number of wire per slot of two windings of Power Magnetic Bearing.Basic steps about structural design to Power stator of Magnetic Bearing is generalized after analyzing and comparing the nature characteristics between Power Magnetic Bearing and general AC machine. Matching relation about the number of wire per slot of two windings is deduced and powers of two windings are calculated by utilizing conservation of energy principle.A winding of general AC machine is changed into a one of Power Magnetic Bearing by utilizing the relation, that the number of wire per slot of two windings, and finite element analysis is implemented to the magnetic field of the Power Magnetic Bearing. It turns out that the stator dimensions which are determined by the electromagnetic parameters of former motor limit the increase of power of Power Magnetic Bearing. Therefore a measure to increase the height of the stator yoke is put forward to counter balance the power loss. It shows that Power Magnetic Bearing with improvement has a higher magnetic flux density of air-gap through theoretical arithmetic and electromagnetic field analysis. It means that the power of Power Magnetic Bearing increases.A mathematic model of Electromagnetic force and an axial motion control equation of rotor is deduced under differential state of Thrust Magnetic bearing by utilizing balance equation of stator voltage, motion equation of Thrust collar and fundamental law of magnetic circuit. A closed loop transfer function block diagram in which stator voltage is used as a control variable is designed. This diagram establishes a theoretical basis for the design of control circuit and the setting of control variable.In order to test the mechanical property and control system of Thrust Magnetic bearing, a set of loading experimental platform is designed. This platform contains support device and force device, and its reliability is analyzed by finite element method.更多还原