Stable positioning of bearingless induction machine under temperature variation

无轴承感应电机在温度变化下的稳定定位

• 批准号: 13650316
• 负责人: CHIBA Akira
• 金额: $ 2.37万
• 依托单位: Tokyo University of Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650316/
• 关键词: bearingless motor; bearingless; magnetic bearing; magnetic suspension; 電磁力支持

In recent years, developments of bearingless drives are undergoing several parts of the world. The bearingless drives are the electric motors or generators with self-magnetic suspensions. Thus, there is increasing expectation of wide range of applications such as vacuum, low or high temperature conditions, harsh environments, long life and highly reliable machines. In fact, extensive developments can be seen in artificial heart blood pumps, canned pumps in chemical plants, semiconductor processes, bio reactors in bio engineering, telescope positioning in space satellitesThe investigators have been done notable research in induction type bearingless motors. A control method to suspend a rotation shaft at rated load torque has been made obvious. However, there exist a possible problem of touch down of the shaft under temperature variations of a rotor resistanceIn this research, magnetic suspension is found to be unstable is flux vectors have phase differences when rotor resistance reference value has discrepancy with respect to the actual rotor resistance. To avoid this problem, on-line estimation method of the rotor resistance is proposed. In the proposed method, a unique bearingless magnetic suspension feedback signal is used. In order to suspend a shaft weight, a static radial force is required, thus, radial force commands automatically generated in feedback loops to cancel the static force. Information of radial force command is employed to find the rotor resistance value. In addition, temperature drift in gap sensors are extensively compensated to realize practical system setup

近年来，无轴承驱动器的发展正在世界多个地区进行。无轴承驱动器是具有自磁悬浮的电动机或发电机。因此，人们对真空、低温或高温条件、恶劣环境、长寿命和高可靠性机器等广泛应用的期望越来越高。事实上，在人工心脏血泵、化工厂中的罐装泵、半导体工艺、生物工程中的生物反应器、空间卫星中的望远镜定位方面都可以看到广泛的发展。研究人员在感应式无轴承电机方面已经做了引人注目的研究。在额定负载扭矩下悬挂旋转轴的控制方法已经显而易见。然而，在转子电阻温度变化的情况下，可能存在轴触地的问题。本研究发现，当转子电阻参考值与实际转子电阻有差异时，磁悬浮不稳定，因为磁通矢量存在相位差。 。为了避免这个问题，提出了转子电阻的在线估计方法。在所提出的方法中，使用了独特的无轴承磁悬浮反馈信号。为了悬挂轴重物，需要静态径向力，因此，反馈回路中自动生成径向力指令来抵消静态力。利用径向力命令的信息来找到转子电阻值。此外，间隙传感器的温度漂移得到了广泛补偿，以实现实际的系统设置