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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >5-AXES LEVITATION OF A ROTOR BY ACTIVE MAGNETIC BEARINGS EMPLOYING DIRECT OUTPUT FEEDBACK CONTROL
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5-AXES LEVITATION OF A ROTOR BY ACTIVE MAGNETIC BEARINGS EMPLOYING DIRECT OUTPUT FEEDBACK CONTROL

机译：主动磁轴承采用直接输出反馈控制，使转子的五轴悬浮

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In recent years the application of active magnetic bearings (AMB), as supporting element as well as vibration controller for rotors, has attracted considerable attention from researchers. In this work an attempt has been made for the complete levitation of a rotor weighing 4 kg, supported on two radial active magnetic bearings and two axial passive magnetic bearings (PMB) resulting in 5-axes levitation. The active bearings working in the mode of attraction make the system inherently unstable. Herein, a direct output feedback control scheme based on proportional and derivative of position signal has been employed to achieve stability. The active magnetic bearings consist of electromagnetic actuators, proximity probes for position measurement, feedback controller and current feedback type power amplifier. The passive bearings consisting of axially magnetized circular permanent magnets work in the mode of repulsion. The design of the electromagnetic actuator has been carried out considering load carrying capacity of the AMB, core loss and the resistive loss in the coil, so that the temperature rise in the core as well as in the coil is within allowable limit. Design of the feedback controller is based on direct output feedback control scheme, which makes the controller design easier and implementation of the controller hardware becomes simpler. The feedback controller parameters have been selected appropriately to generate required stiffness and damping in the AMBs for stable levitation of the rotor. The rotor has been driven up to a speed of 2000 rpm.
机译：近年来，主动磁轴承（AMB）作为转子的支撑元件和振动控制器的应用引起了研究人员的极大关注。在这项工作中，已尝试完全悬浮4公斤重的转子，并在两个径向主动磁轴承和两个轴向被动磁轴承（PMB）上进行支撑，以产生5轴悬浮。以吸引方式工作的主动轴承使系统固有地不稳定。这里，已经采用基于位置信号的比例和导数的直接输出反馈控制方案来实现稳定性。有源电磁轴承由电磁执行器，用于位置测量的接近探针，反馈控制器和电流反馈型功率放大器组成。由轴向磁化的圆形永磁体组成的被动轴承以排斥的方式工作。电磁致动器的设计考虑了AMB的承载能力，铁芯损耗和线圈中的电阻损耗，因此铁芯以及线圈中的温度上升均在允许的范围内。反馈控制器的设计基于直接输出反馈控制方案，这使得控制器设计更加容易，并且控制器硬件的实现也变得更加简单。已经适当选择了反馈控制器参数，以在AMB中生成所需的刚度和阻尼，以使转子稳定悬浮。转子已被驱动至2000 rpm的速度。

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