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Enhancement of Dynamic Stiffness and Precision of Active Magnetic Bearings by Using Integrated Flux Density Measurement and Fast Switching Converter Topologies

通过使用集成磁通密度测量和快速开关转换器拓扑来增强主动磁力轴承的动态刚度和精度

基本信息

批准号：
221322256
负责人：
Professor Dr.-Ing. Wilfried Hofmann
金额：
--
依托单位：
Institut für Ionenstrahlphysik und Materialforschung
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/221322256?language=en
关键词：
Enhancement Dynamic Stiffness Precision Active

项目摘要

Within the last years magnetic bearing technology has been pushed by a significant upturn in oil & gas industry as well as in machining applications. Nowadays, specific high speed spindles are equipped with industrially standardized active magnetic bearing systems (AMB) allowing for highly precise rotor positioning due to their contact-free and low-maintenance operation. However, compared to conventional ball bearings well-established AMB systems are limited by their relatively low stiffness. In order to improve dynamic performance flux based control algorithms have been suggested for the last decades already. The main challenge is how to integrate commercially available magnetic field sensors into the tiny air gap of typically 500 micro meter. Therefore, ultra-thin and preferably even flexible sensor elements meeting the strong requirements in lifetime and reliability are essentially needed. Within this project ultra-thin Bismuth Hall sensors with a total thickness of less than 150 micro meter are under development. After fabrication the sensor functionality and suitability for detection of time-varying magnetic fields in AMB systems are to be investigated intensely. Finally the sensor signal is intended to be used as directly integrated feedback for flux based AMB control strategies. Besides Hall sensorics precise rotor positioning strongly demands fast switching converters operated with high pulse frequencies (50 kHz) in order to achieve both accurate flux density/current control as well as a high bandwidth of the carrier frequency based position measurement system. Therefore, fast switching Gallium-Nitride-FETs (GaN) will be used for an H-bridge-converter powering the AMB coils. By using GaN-FETs a fast switching converter featuring substantially reduced dead times and low conduction losses can be realized.

在过去的几年里，磁轴承技术已经被石油和天然气工业以及机械加工应用的显著好转所推动。如今，特定的高速主轴配备了工业标准化的主动磁轴承系统（AMB），由于其无接触和低维护操作，允许高度精确的转子定位。然而，与传统的滚珠轴承相比，成熟的AMB系统受到其相对低的刚度的限制。为了改善动态性能，基于磁通的控制算法已经在过去几十年中被提出。主要的挑战是如何将商用磁场传感器集成到通常为500微米的微小气隙中。因此，本质上需要满足寿命和可靠性的强烈要求的超薄且优选甚至柔性的传感器元件。在该项目中，正在开发总厚度小于150微米的超薄Bispert-Hall传感器。制造后的传感器的功能和适用性检测的时变磁场的电磁轴承系统进行了深入的研究。最后，传感器信号旨在用作基于磁链的AMB控制策略的直接积分反馈。除了霍尔传感器之外，精确的转子定位强烈要求以高脉冲频率（50 kHz）操作的快速开关转换器，以便实现精确的磁通密度/电流控制以及基于载波频率的位置测量系统的高带宽。因此，快速开关氮化镓场效应晶体管（GaN）将用于H桥转换器供电的电磁轴承线圈。通过使用GaN-FET，可以实现具有显著减少的死区时间和低传导损耗的快速开关转换器。