Design and parameter estimation of hybrid magnetic bearings for blood pump applications

Lim, Teck Meng; Zhang, Dongsheng; Yang, Jingyi; Cheng, Shanbao; Low, Sze Hsien; Chua, Leok Poh; Wu, Xiaowei

doi:10.1016/j.ymssp.2009.03.012

Cited by 20 publications

(8 citation statements)

References 17 publications

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“…When the rotor assembly of MSCMG is in the suspension state and the axial bearing state, the axial displacement z can be obtained according to (15) and z¼0.36 mm. The axial displacement stiffness in this state is × 3.21 10 N/m 4 calculated by (16).…”

Section: Fem Model and Validationmentioning

confidence: 88%

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A novel integrated 4-DOF radial hybrid magnetic bearing for MSCMG

Sun

Han

et al. 2017

Journal of Magnetism and Magnetic Materials

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Section: Fem Model and Validationmentioning

confidence: 88%

“…Based on [14][15][16][17], the integrated 4-DOF RHMB is designed, the main parameters of which are shown in Table 1. The 3-D finite element model built by using ANSYS 12.1 is shown in Fig.…”

Section: Fem Model and Validationmentioning

confidence: 99%

A novel integrated 4-DOF radial hybrid magnetic bearing for MSCMG

Sun

Han

et al. 2017

Journal of Magnetism and Magnetic Materials

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“…In recent decades, active magnetic bearings (AMBs) and electromagnetic levitation techniques have been widely used in a variety of industrial rotating machineries including compressors, spindle turbines, and turbomachinery [1,2]. Compared with conventional rolling element bearings for machining processes, the virtues of AMBs lie in their greater abilities of adjustable damping and stiffness, high rotor speeds and small rotor vibrations [3,4].…”

Section: Introductionmentioning

confidence: 99%

Dual-mode predictive control of a rotor suspension system

Ren

Zhang

2019

Sci. China Inf. Sci.

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Rotor active magnetic bearing (rotor-AMB) systems are frequently used to alleviate vibrations for various applications such as in national defense, manufacturing industries, IC production, and aerospace engineering. One obstacle to improve machining efficiency and quality is the open-loop instability of rotor-AMB systems during the machining process. We built a closed-loop processing platform using a spindle rotor installed with AMBs and thereby developed a rotor-AMB suspension system embedded with a dual-mode predictive controller (DMPC). The performance of the system is thus substantially improved. In the proposed DMPC, both model-based prediction and receding horizon optimization are utilized to guarantee the closedloop stability of the rotor-AMB suspension systems with input constraints. Finally, the effectiveness and superiority of the proposed method are examined through substantial levitation experiments on a machining platform with installed AMBs.

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“…By analyzing the frequency dependent feedback controller transfer function, Williams et al [14] obtained the equivalent stiffness and damping coefficients theoretically. Under the shaker excitation, Lim et al [15] experimentally identified a five-degree-of-freedom hybrid magnetic bearing for blood bump applications at static suspension situation with proportional-integral-derivative (PID) controllers. Tsai et al [16] applied the wavelet transform algorithm to identify the magnetic damping and stiffness coefficients.…”

Section: Introductionmentioning

confidence: 99%

Active Magnetic Bearings Stiffness and Damping Identification from Frequency Characteristics of Control System

Jin

Zhou

et al. 2016

Shock and Vibration

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At present, the stiffness and damping identification for active magnetic bearings (AMBs) are still in the stage of theoretical analysis. The theoretical analysis indicates that if the mechanical structure and system parameters are determined, AMBs stiffness and damping are only related to frequency characteristic of control system, ignoring operating condition. More importantly, few verification methods are proposed. Considering the shortcomings of the theoretical identification, this paper obtains these coefficients from the experiment by using the magnetic bearing as a sine exciter. The identification results show that AMBs stiffness and damping have a great relationship with the control system and rotating speed. Specifically, at low rotating speed, the stiffness and damping can be obtained from the rotor static suspension by adding the same excitation frequency. However, at high speed, different from the static suspension situation, the AMBs supporting coefficients are not only related to the frequency characteristics of control system, but also related to the system operating conditions.

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Design and parameter estimation of hybrid magnetic bearings for blood pump applications

Cited by 20 publications

References 17 publications

A novel integrated 4-DOF radial hybrid magnetic bearing for MSCMG

A novel integrated 4-DOF radial hybrid magnetic bearing for MSCMG

Dual-mode predictive control of a rotor suspension system

Active Magnetic Bearings Stiffness and Damping Identification from Frequency Characteristics of Control System

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