The Experts below are selected from a list of 8133 Experts worldwide ranked by ideXlab platform

Shyh Leh Chen - One of the best experts on this subject based on the ideXlab platform.

  • Nonlinear high-gain observer for a three-pole active Magnetic bearing system
    2011 8th Asian Control Conference (ASCC), 2011
    Co-Authors: Shyh Leh Chen, Yung-ho Hsiao
    Abstract:

    This study is to design an observer for the rotor position of a voltage-controlled 3-pole active Magnetic bearing (AMB) system. The observer will be based on the input voltages and coil currents that drive the Magnetic Poles. Such an observer can be utilized in the sensorless control of the AMB system. Due to the strong nonlinearity in the dynamics of 3-pole AMB system, the theory of nonlinear high-gain observer is adopted to design the observer. The obtained observer is verified numerically and experimentally.

  • brief nonlinear control of a 3 pole active Magnetic bearing system
    Automatica, 2003
    Co-Authors: Chan Tang Hsu, Shyh Leh Chen
    Abstract:

    Cost-down is one of the major challenges for active Magnetic bearing (AMB) systems in industry today. An AMB system with three Magnetic Poles is proposed and studied in this work. Compared to the popular 8-pole AMB, the 3-pole system requires fewer power amplifiers, which can reduce the overall cost. The primary problem in the 3-pole AMB is the strong coupling in the Magnetic flux between Magnetic Poles. Consequently, the system is strongly nonlinear not only in states but also in control inputs. In particular, the input currents enter the system model in a quadratic form. The feedback linearization problem for this non-affine nonlinear system is solved. Then, the integral sliding mode control method is incorporated to yield a robust nonlinear controller for the 3-pole AMB system. It is found through simulations and experiments that the proposed controller can achieve stability and high steady-state accuracy even under the influence of large uncertainties.

  • Nonlinear control of a 3-pole active Magnetic bearing system
    Automatica, 2003
    Co-Authors: Chan Tang Hsu, Seng-chi Chen, Shyh Leh Chen
    Abstract:

    Cost-down is one of the major challenges for active Magnetic bearing (AMB) systems in industry today. An AMB system with three Magnetic Poles is proposed and studied in this work. Compared to the popular 8-pole AMB, the 3-pole system requires fewer power amplifiers, which can reduce the overall cost. The primary problem in the 3-pole AMB is the strong coupling in the Magnetic flux between Magnetic Poles. Consequently, the system is strongly nonlinear not only in states but also in control inputs. In particular, the input currents enter the system model in a quadratic form. The feedback linearization problem for this non-affine nonlinear system is solved. Then, the integral sliding mode control method is incorporated to yield a robust nonlinear controller for the 3-pole AMB system. It is found through simulations and experiments that the proposed controller can achieve stability and high steady-state accuracy even under the influence of large uncertainties. (C) 2002 Elsevier Science Ltd. All rights reserved.

Chan Tang Hsu - One of the best experts on this subject based on the ideXlab platform.

  • brief nonlinear control of a 3 pole active Magnetic bearing system
    Automatica, 2003
    Co-Authors: Chan Tang Hsu, Shyh Leh Chen
    Abstract:

    Cost-down is one of the major challenges for active Magnetic bearing (AMB) systems in industry today. An AMB system with three Magnetic Poles is proposed and studied in this work. Compared to the popular 8-pole AMB, the 3-pole system requires fewer power amplifiers, which can reduce the overall cost. The primary problem in the 3-pole AMB is the strong coupling in the Magnetic flux between Magnetic Poles. Consequently, the system is strongly nonlinear not only in states but also in control inputs. In particular, the input currents enter the system model in a quadratic form. The feedback linearization problem for this non-affine nonlinear system is solved. Then, the integral sliding mode control method is incorporated to yield a robust nonlinear controller for the 3-pole AMB system. It is found through simulations and experiments that the proposed controller can achieve stability and high steady-state accuracy even under the influence of large uncertainties.

  • Nonlinear control of a 3-pole active Magnetic bearing system
    Automatica, 2003
    Co-Authors: Chan Tang Hsu, Seng-chi Chen, Shyh Leh Chen
    Abstract:

    Cost-down is one of the major challenges for active Magnetic bearing (AMB) systems in industry today. An AMB system with three Magnetic Poles is proposed and studied in this work. Compared to the popular 8-pole AMB, the 3-pole system requires fewer power amplifiers, which can reduce the overall cost. The primary problem in the 3-pole AMB is the strong coupling in the Magnetic flux between Magnetic Poles. Consequently, the system is strongly nonlinear not only in states but also in control inputs. In particular, the input currents enter the system model in a quadratic form. The feedback linearization problem for this non-affine nonlinear system is solved. Then, the integral sliding mode control method is incorporated to yield a robust nonlinear controller for the 3-pole AMB system. It is found through simulations and experiments that the proposed controller can achieve stability and high steady-state accuracy even under the influence of large uncertainties. (C) 2002 Elsevier Science Ltd. All rights reserved.

Seng-chi Chen - One of the best experts on this subject based on the ideXlab platform.

  • Nonlinear control of a 3-pole active Magnetic bearing system
    Automatica, 2003
    Co-Authors: Chan Tang Hsu, Seng-chi Chen, Shyh Leh Chen
    Abstract:

    Cost-down is one of the major challenges for active Magnetic bearing (AMB) systems in industry today. An AMB system with three Magnetic Poles is proposed and studied in this work. Compared to the popular 8-pole AMB, the 3-pole system requires fewer power amplifiers, which can reduce the overall cost. The primary problem in the 3-pole AMB is the strong coupling in the Magnetic flux between Magnetic Poles. Consequently, the system is strongly nonlinear not only in states but also in control inputs. In particular, the input currents enter the system model in a quadratic form. The feedback linearization problem for this non-affine nonlinear system is solved. Then, the integral sliding mode control method is incorporated to yield a robust nonlinear controller for the 3-pole AMB system. It is found through simulations and experiments that the proposed controller can achieve stability and high steady-state accuracy even under the influence of large uncertainties. (C) 2002 Elsevier Science Ltd. All rights reserved.

S.-j. Wang - One of the best experts on this subject based on the ideXlab platform.

  • Simulation study of the Magnetic coupling between radial Magnetic gears
    IEEE Transactions on Magnetics, 1997
    Co-Authors: Y. D. Yao, C. C. Hsieh, D.y. Chiang, Der-ray Huang, S.-j. Wang
    Abstract:

    The torque of Magnetic coupling with different Magnetic Poles has been investigated by theoretical computations with two dimensional modeling processes of finite element analysis. The torque is sensitive to the number of Magnetic Poles, the material of the Magnetic gears, and the distance between the Magnetic gears. For a 2 mm separation distance of two Magnetic gears with 20 mm radius, the maximum torque occurs between 6 and 20 Poles which is dependent on the thickness of the iron yoke inside the magnets, and on the magnetization configuration within a pole of the magnets. This is explained by analyzing the Magnetic coupling strength of each pole. Finally, the computer calculation is tested using an experimental data taken from a sintered NdFeB Magnetic gear.

  • The radial Magnetic coupling studies of perpendicular Magnetic gears
    IEEE Transactions on Magnetics, 1996
    Co-Authors: Y. D. Yao, C. C. Hsieh, D.y. Chiang, Der-ray Huang, S.-j. Wang, Tai-fa Ying
    Abstract:

    The torque of the radial Magnetic coupling between perpendicular Magnetic gears with different Magnetic Poles has been investigated experimentally. The torque of Magnetic coupling decreases with increasing the distance between the Magnetic gears. For different multipole Magnetic couplings with the same Magnetic field strength, the torque of Magnetic coupling increases as the number of Magnetic Poles increases for distances smaller than a critical separation distance d/sub c/, but it is reversed as the separation distance becomes larger. This critical separation distance for our sintered NdFeB magnet system with an iron yoke of 2 mm thickness is roughly between 9 and 11 mm. This phenomenon is explained by analyzing the Magnetic coupling strength of different Poles of magnets on the perpendicular Magnetic gears.

  • The radial Magnetic coupling studies between Magnetic gears
    IEEE Transactions on Magnetics, 1995
    Co-Authors: Y. D. Yao, S.m. Lin, S.-j. Wang
    Abstract:

    The torque of the radial Magnetic coupling between Magnetic gears with different Magnetic Poles has been investigated by experimental and computer simulation analyses. The torque of Magnetic coupling is sensitive to the number of Magnetic Poles, and it decreases with increasing the distance between the Magnetic gears. We can increase the torque by increasing the number of Poles for Magnetic coupling between Magnetic gears with short separation distance. The three dimensional computer simulation calculated values of the torque of Magnetic coupling by both the virtual work technique and Maxwell stress tensor method are in excellent agreement with the experimentally measured values.

  • Theoretical computations for the torque of Magnetic coupling
    IEEE Transactions on Magnetics, 1995
    Co-Authors: Gwo-ji Chiou, Der-ray Huang, S.-j. Wang
    Abstract:

    The torque of Magnetic coupling with different Magnetic Poles has been investigated by theoretical computations with both FEA and torque formula techniques. The torque of Magnetic coupling is sensitive to the number of Magnetic Poles, and it decreases with increasing the distance between the Magnetic rings. From our theoretical computations, we find that we can increase the torque by increasing the number of Poles for Magnetic coupling between Magnetic rings with short distance; however, this is not true for Magnetic rings with large separation. We also demonstrate that the theoretical computations of both MagNet software and torque formula established by Furlani (1993) are quite consistent and useful for computing the torque of various Magnetic couplings. Finally, the theoretical calculation has been successfully tested by using an experimental data taken from a NdFeB Magnetic coupling.

Lihui Zhang - One of the best experts on this subject based on the ideXlab platform.

  • New helical-shape Magnetic pole design for Magnetic Lead Screw enabling structure simplification
    2015 IEEE International Magnetics Conference (INTERMAG), 2015
    Co-Authors: Kaiyuan Lu, Weimin Wu, Lihui Zhang
    Abstract:

    Magnetic Lead Screw (MLS) is a new type of high performance linear actuator that is attractive for many potential applications. Structure simplification is quite essential in promoting the MLS technology and the main difficulty of the MLS technology lies in the manufacturing of its complicated helical-shape Magnetic Poles. In this paper, a new type of structure is proposed for forming the required helical-shape Magnetic Poles in a much simpler way. It is demonstrated that traditional ring-shape Magnetic Poles, with proper rotating, can well approximate the complicated helical-shape Magnetic Poles, resulting in great manufacturing simplification. The performance of the new structure is compared to a MLS with ideal helical-shape Poles using 3D Finite Element Analysis. Surface mounted and flux concentration designs using the new principle are both introduced.

  • New Helical-Shape Magnetic Pole Design for Magnetic Lead Screw Enabling Structure Simplification
    IEEE Transactions on Magnetics, 2015
    Co-Authors: Kaiyuan Lu, Yongming Xia, Weimin Wu, Lihui Zhang
    Abstract:

    Magnetic lead screw (MLS) is a new type of high performance linear actuator that is attractive for many potential applications. The main difficulty of the MLS technology lies in the manufacturing of its complicated helical-shape Magnetic Poles. Structure simplification is, therefore, quite essential in promoting the MLS technology. In this paper, a new approach is proposed for forming the required helical-shape Magnetic Poles in a much simpler way. It is demonstrated that the traditional ring-shape Magnetic Poles, by proper rotating or shaping, can well approximate the complicated helical-shape Magnetic Poles. The performance of the new structure is compared with a MLS with ideal helical-shape Magnetic Poles using 3-D finite-element analysis. Halbach and flux concentration designs using the new approach are introduced.