The Experts below are selected from a list of 21024 Experts worldwide ranked by ideXlab platform
Fang Jiancheng - One of the best experts on this subject based on the ideXlab platform.
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a novel structure of permanent magnet biased radial hybrid Magnetic Bearing
Journal of Magnetism and Magnetic Materials, 2011Co-Authors: Sun Jinji, Fang JianchengAbstract:The paper proposes a novel structure for a permanent-magnet-biased radial hybrid Magnetic Bearing. Based on the air gap between the rotor and stator of traditional radial hybrid Magnetic Bearings, a subsidiary air gap is first constructed between the permanent magnets and the inner Magnetic parts. Radial Magnetic Bearing makes X and Y Magnetic fields independent of each other with separate stator poles, and the subsidiary air gap makes control flux to a close loop. As a result, Magnetic field coupling of the X and Y channels is decreased significantly by the radial hybrid Magnetic Bearing and makes it easier to design control systems. Then an external rotor structure is designed into the radial hybrid Magnetic Bearing. The working principle of the radial hybrid Magnetic Bearing and its mathematical model is discussed. Finally, a non-linear Magnetic network method is proposed to analyze the radial hybrid Magnetic Bearing. Simulation results indicate that Magnetic fields in the two channels of the proposed radial hybrid Magnetic Bearing decouple well from each other.
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Magnetic Force Characteristics of A Novel Permanent Magnet Biased Axial Magnetic Bearing
Journal of Mechanical Engineering, 2010Co-Authors: Fang JianchengAbstract:To solve the contradiction between axial dimension and precision of Magnetic Bearing system,the Magnetic force characteristics of a novel permanent magnet biased axial Magnetic Bearing which integrates rotor radial torsion with axial translation control function is researched.Equivalent Magnetic circuit method is used to carry out modeling of Magnetic circuit of Magnetic Bearing.Integral calculation formula of Magnetic force of Magnetic Bearing is given on the basis of the Magnetic circuit model,the Magnetic force characteristic curve of the closed-loop system of Magnetic Bearing is obtained.The analysis on the Magnetic Bearing used on a flywheel shows that there exists good relationship between the Magnetic force of Magnetic Bearing and the Magnetic pole air gap and control current,and all the control channels are approximately decoupled.Compared to the typical Magnetic Bearing structure,the proposed one helps to improve the control accuracy and reduce the axial dimension of the Magnetic Bearing system.It is suitable for Magnetic suspension flywheel system.
Sun Jinji - One of the best experts on this subject based on the ideXlab platform.
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a novel structure of permanent magnet biased radial hybrid Magnetic Bearing
Journal of Magnetism and Magnetic Materials, 2011Co-Authors: Sun Jinji, Fang JianchengAbstract:The paper proposes a novel structure for a permanent-magnet-biased radial hybrid Magnetic Bearing. Based on the air gap between the rotor and stator of traditional radial hybrid Magnetic Bearings, a subsidiary air gap is first constructed between the permanent magnets and the inner Magnetic parts. Radial Magnetic Bearing makes X and Y Magnetic fields independent of each other with separate stator poles, and the subsidiary air gap makes control flux to a close loop. As a result, Magnetic field coupling of the X and Y channels is decreased significantly by the radial hybrid Magnetic Bearing and makes it easier to design control systems. Then an external rotor structure is designed into the radial hybrid Magnetic Bearing. The working principle of the radial hybrid Magnetic Bearing and its mathematical model is discussed. Finally, a non-linear Magnetic network method is proposed to analyze the radial hybrid Magnetic Bearing. Simulation results indicate that Magnetic fields in the two channels of the proposed radial hybrid Magnetic Bearing decouple well from each other.
Gao Yu - One of the best experts on this subject based on the ideXlab platform.
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Study of permanent-magnet biased hybrid Magnetic Bearing
Machinery Design and Manufacture, 2010Co-Authors: Gao YuAbstract:A structure and operating principle of permanent magnet biasehybrid Magnetic Bearing is proposed.The design method of structure parameter was given,Proposed a hybrid permanent magnet biased Magnetic Bearing design.The analysis of finite element method shows that the structure of the permanent magnet biased hybrid Magnetic Bearing proposed in this paper is feasible and its calculation method is correct.
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Study on hybrid type power amplifier for Magnetic Bearing
Machinery Design and Manufacture, 2009Co-Authors: Gao YuAbstract:A structure of a radial Magnetic Bearing with resonance circuit is proposed,which dose not need separate displacement sensors.The operating principle of the radial Magnetic Bearing is also introduced.The stability of the radial Magnetic Bearing is analyzed by the control system theory.The analysis shows that the proposed radial Magnetic Bearing with resonance circuit is instable in dynamic state process.The simulation study on an example shows that the radial Magnetic Bearing with resonance circuit can levitate stably by means of a PD controller.But it is of steady-state error.
Lijiang Qin - One of the best experts on this subject based on the ideXlab platform.
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Modeling and control of a micro Magnetic Bearing
Nano- and Microtechnology: Materials Processes Packaging and Systems, 2002Co-Authors: Lijiang Qin, Ronald B. Zmood, Paul E. Jones, Dinesh K. SoodAbstract:A prototype micro Magnetic Bearing actuator having an outside diameter of 2.6 mm has been fabricated at Royal Melbourne Institute of Technology and reported previously with an emphasis on fabrication issues. The discussion of this paper will focus on the design and control of the micro Magnetic Bearing with a particular emphasis on control system design and analysis. To this end, a simplified dynamic model for the micro actuator has been developed and used in determining controller parameters, leading to a successfully suspended non-rotating rotor in the micro Magnetic Bearing system.
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Design of a micro Magnetic Bearing actuator
1999Co-Authors: Lijiang Qin, Ronald B. ZmoodAbstract:A micro Magnetic Bearing actuator, with an outside diameter of 2.6 mm, is being fabricated at RMIT. The rotor of the Bearing actuator is structured to operate with active control in the radial directions while being supported passively in the axial direction. This paper addresses the design problem for micro Magnetic Bearing actuators. The key issue in the design is the evaluation of Magnetic forces. By applying the fringing range method developed by the authors, a Magnetic circuit model is developed for this actuator, which is used for calculating the flux densities at key locations and the Magnetic forces on the rotor. Expressions for Magnetic forces have been developed previously and a design procedure is proposed in this paper. It is found by using these expressions and the proposed procedure, that we can easily investigate the influence of design parameters on actuator performance. Design results for the micro Magnetic Bearing are given in detail.
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A design methodology for micro Magnetic Bearing systems
1997Co-Authors: Ronald B. Zmood, Lijiang QinAbstract:In this paper we describe a design methodology which has been successfully developed for the design of Magnetic Bearings. Its adaptation and application to the design of a micro Magnetic Bearing is presented. Particular design problems of micro Magnetic Bearing systems are addressed, such as the selection of the Bearing topologies, the Magnetic modelling and design of the actuators, and the modelling and performance simulation of these Bearing systems. The design trade-offs are considered and it is shown that the design of actuators and their control systems need to be considered concurrently. As an example, design results for a micro Magnetic Bearing with a diameter of 2.1 mm are presented.
Ronald B. Zmood - One of the best experts on this subject based on the ideXlab platform.
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Modeling and control of a micro Magnetic Bearing
Nano- and Microtechnology: Materials Processes Packaging and Systems, 2002Co-Authors: Lijiang Qin, Ronald B. Zmood, Paul E. Jones, Dinesh K. SoodAbstract:A prototype micro Magnetic Bearing actuator having an outside diameter of 2.6 mm has been fabricated at Royal Melbourne Institute of Technology and reported previously with an emphasis on fabrication issues. The discussion of this paper will focus on the design and control of the micro Magnetic Bearing with a particular emphasis on control system design and analysis. To this end, a simplified dynamic model for the micro actuator has been developed and used in determining controller parameters, leading to a successfully suspended non-rotating rotor in the micro Magnetic Bearing system.
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Design of a micro Magnetic Bearing actuator
1999Co-Authors: Lijiang Qin, Ronald B. ZmoodAbstract:A micro Magnetic Bearing actuator, with an outside diameter of 2.6 mm, is being fabricated at RMIT. The rotor of the Bearing actuator is structured to operate with active control in the radial directions while being supported passively in the axial direction. This paper addresses the design problem for micro Magnetic Bearing actuators. The key issue in the design is the evaluation of Magnetic forces. By applying the fringing range method developed by the authors, a Magnetic circuit model is developed for this actuator, which is used for calculating the flux densities at key locations and the Magnetic forces on the rotor. Expressions for Magnetic forces have been developed previously and a design procedure is proposed in this paper. It is found by using these expressions and the proposed procedure, that we can easily investigate the influence of design parameters on actuator performance. Design results for the micro Magnetic Bearing are given in detail.
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A design methodology for micro Magnetic Bearing systems
1997Co-Authors: Ronald B. Zmood, Lijiang QinAbstract:In this paper we describe a design methodology which has been successfully developed for the design of Magnetic Bearings. Its adaptation and application to the design of a micro Magnetic Bearing is presented. Particular design problems of micro Magnetic Bearing systems are addressed, such as the selection of the Bearing topologies, the Magnetic modelling and design of the actuators, and the modelling and performance simulation of these Bearing systems. The design trade-offs are considered and it is shown that the design of actuators and their control systems need to be considered concurrently. As an example, design results for a micro Magnetic Bearing with a diameter of 2.1 mm are presented.
