The Experts below are selected from a list of 9516 Experts worldwide ranked by ideXlab platform
J.z. Jiang - One of the best experts on this subject based on the ideXlab platform.
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Comparison of outer-rotor stator-permanent-magnet Brushless Motor drives for electric vehicles
2008Co-Authors: Kwok Tong Chau, Chunhua Liu, J.z. JiangAbstract:In this paper, two emerging outer-rotor stator-permanent-magnet (PM) Brushless Motor drives, namely the doubly-salient PM Motor drive and the PM hybrid Brushless Motor drive, are firstly quantitatively compared, which are particularly attractive for serving as in-wheel Motor drives for electric vehicles. In order to enable a fair comparison, these two Motor drives are designed with the same peripheral dimensions and based on the same outer-rotor 36/24-pole topology. By utilizing the circuit-field-torque time-stepping finite element method for analysis, their steady-state and transient performances are critically compared. Moreover, the cost analysis of these two machines is conducted to evaluate their cost effectiveness.
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a flux mnemonic permanent magnet Brushless Motor for electric vehicles
Journal of Applied Physics, 2008Co-Authors: Kwok Tong Chau, Xinhua Liu, J.z. JiangAbstract:In this paper, a new permanent magnet (PM) Brushless Motor is proposed for electric vehicles. The key is to incorporate the concept of memory Motors, namely, the online tunable flux-mnemonic PMs, into the stator doubly fed doubly salient PM Motor, hence achieving effective air-gap flux control. By further employing the outer-rotor and double-layer-stator topology, the proposed Motor takes the definite advantages of compact structure, low armature reaction, and direct-drive capability. Increasingly, this Motor can offer the unique features of pole dropping and pole reversing. Finite element analysis and, hence, computer simulation are given to verify the validity of the proposed Motor.
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Novel wide range speed control of permanent magnet Brushless Motor drives
IEEE Transactions on Power Electronics, 1995Co-Authors: C.c. Chan, J.z. Jiang, W. Xia, K.t. ChanAbstract:This paper presents a novel approach for the wide range speed control of a permanent magnet (PM) Brushless Motor drive, including both sinewave and squarewave versions. As compared with conventional flux-weakening control, the approach has definite advantages in that it can be applied to the squarewave PM Brushless Motor drive directly, and even to the Motor drive with negligible mutual inductances between phase windings. Moreover, it is easier to implement than flux-weakening control because no coordinate transformation is needed. The key of this approach is to make use of the transformer EMF in such a way that it weakens the rotational EMF when the Motor operates above the base speed, leading to the achievement of constant-power operation. Computer simulation and experimental results show that the proposed approach works well. >
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Advanced conduction angle control of permanent magnet Brushless Motor drives
1998 International Conference on Power Electronic Drives and Energy Systems for Industrial Growth 1998. Proceedings., 1Co-Authors: Jinyun Gan, Kwok Tong Chau, C.c. Chan, J.z. JiangAbstract:A novel advanced conduction angle control scheme for permanent magnet Brushless Motor drives is presented in this paper. The originality of this scheme is to employ the transformer EMF in stator windings to counteract the rotational EMF by controlling the advanced conduction angle when the Motor drive operates above the base speed. Hence the constant-power operation region can be extended considerably, even though the current regulator is in saturation. The attractive feature of the proposed control scheme is that it has better controllability and easier to implement than conventional flux-weakening control scheme because of the absence of coordinate transformation. It can be applied to all PM Brushless Motors, including conventional, phase-decoupling, sinusoidal-fed and rectangular-fed types. An Intel 8098-based digital controller and a phase-decoupling rectangular-fed PM Brushless Motor are employed to implement the scheme. The hardware and the software are simple and flexible. Both computer simulation and experimental results of a 1-kW Motor drive system verifies that the proposed control scheme works well.
Kwok Tong Chau - One of the best experts on this subject based on the ideXlab platform.
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Electric Vehicle Machines and Drives: Design, Analysis and Application - Permanent Magnet Brushless Motor Drives
Electric Vehicle Machines and Drives, 2015Co-Authors: Kwok Tong ChauAbstract:Among various types of Motor drives, permanent magnet (PM) Brushless Motor drives, especially the PM synchronous Motor drive, are currently the most attractive Motor drives for electric vehicle (EV) propulsion. This chapter presents two major PM Brushless Motor drives, namely the PM synchronous and PM Brushless DC (BLDC) types. It describes their PM materials, system configurations, machine topologies, inverter topologies, and control strategies. The chapter also discusses the corresponding design criteria, design examples, and application examples for EV propulsion. PM materials are the key of PM Brushless Motor drives that provide the machines with lifelong excitation. The system configuration of PM Brushless Motor drives for electric propulsion is similar to that of induction Motor drives. PM Brushless Motors have become the preferred choice for EV propulsion because of their high efficiency and high power density.
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Comparison of outer-rotor stator-permanent-magnet Brushless Motor drives for electric vehicles
2008Co-Authors: Kwok Tong Chau, Chunhua Liu, J.z. JiangAbstract:In this paper, two emerging outer-rotor stator-permanent-magnet (PM) Brushless Motor drives, namely the doubly-salient PM Motor drive and the PM hybrid Brushless Motor drive, are firstly quantitatively compared, which are particularly attractive for serving as in-wheel Motor drives for electric vehicles. In order to enable a fair comparison, these two Motor drives are designed with the same peripheral dimensions and based on the same outer-rotor 36/24-pole topology. By utilizing the circuit-field-torque time-stepping finite element method for analysis, their steady-state and transient performances are critically compared. Moreover, the cost analysis of these two machines is conducted to evaluate their cost effectiveness.
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An integrated magnetic-geared permanent-magnet in-wheel Motor drive for electric vehicles
2008 IEEE Vehicle Power and Propulsion Conference, 2008Co-Authors: Lin-ni Jian, Kwok Tong Chau, Jian-zhong JiangAbstract:This paper proposes an integrated in-wheel Motor for electric vehicles. It can offer the advantages of lightweight, compact size, high efficiency and low-speed high-torque operation. The key is to artfully integrate a coaxial magnetic gear into a permanent-magnet (PM) Brushless Motor in such a way that they can share a common PM rotor, hence the low-speed requirement for direct driving and the high-speed requirement for compact Motor design can be achieved simultaneously. Both the static and dynamic characteristics of the proposed Motor have been studied by time-stepping finite element method. A 500 W prototype has also been built up to verify the validity of the proposed Motor.
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a flux mnemonic permanent magnet Brushless Motor for electric vehicles
Journal of Applied Physics, 2008Co-Authors: Kwok Tong Chau, Xinhua Liu, J.z. JiangAbstract:In this paper, a new permanent magnet (PM) Brushless Motor is proposed for electric vehicles. The key is to incorporate the concept of memory Motors, namely, the online tunable flux-mnemonic PMs, into the stator doubly fed doubly salient PM Motor, hence achieving effective air-gap flux control. By further employing the outer-rotor and double-layer-stator topology, the proposed Motor takes the definite advantages of compact structure, low armature reaction, and direct-drive capability. Increasingly, this Motor can offer the unique features of pole dropping and pole reversing. Finite element analysis and, hence, computer simulation are given to verify the validity of the proposed Motor.
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Novel wide range speed control of permanent magnet Brushless Motor drives
Proceedings of 1995 International Conference on Power Electronics and Drive Systems. PEDS 95, 1Co-Authors: C.c. Chan, W. Xia, Jingwei Jiang, Kwok Tong ChauAbstract:This paper presents a novel approach for the wide range speed control of permanent magnet (PM) Brushless Motor drives, including both sinewave and squarewave versions. As compared with conventional flux-weakening control, the approach has definite advantages in that it can be applied to squarewave PM Brushless Motor drives directly, and even to Motor drives with negligible mutual inductances between phase windings. Moreover, it is easier to implement than flux-weakening control because no coordinate transformation is needed. The key of this approach is to make use of the transformer EMF in such a way that it weakens the rotational EMF when the Motor operates above the base speed, leading to achieve the constant power operation. Computer simulation and experimental results show that the proposed approach works well. >
Farhad Aghili - One of the best experts on this subject based on the ideXlab platform.
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Adaptive Reshaping of Excitation Currents for Accurate Torque Control of Brushless Motors
IEEE Transactions on Control Systems Technology, 2008Co-Authors: Farhad AghiliAbstract:Accurate torque control of a Brushless Motor requires the Motor's torque characteristics, which follows a periodic function of Motor angle. This brief presents a direct adaptive controller for torque control of Brushless Motors, which estimates the Fourier coefficients of this periodic function based on the measurements of Motor phase voltage and angle. It will be analytically shown that the proposed adaptive controller achieves torque tracking regardless of the trajectories of input signals. Moreover, the adaptive controller does not rely on the modeling of the mechanical load, so that control implementation is simple and modular. Experimental results obtained from the McGill/MIT Motor have demonstrated that Motor torque converges to the command torque.
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IROS - Torque control of electric Motors without using torque sensor
2007 IEEE RSJ International Conference on Intelligent Robots and Systems, 2007Co-Authors: Farhad AghiliAbstract:Accurate torque control of a Brushless Motor requires the Motor's torque characteristics, which can be captured by a periodic function in Motor angle. This paper presents a direct adaptive controller for torque control of Brushless Motors, which estimates the Fourier coefficients of the periodic function based on the measurements of Motor phase voltage and angle. It will be analytically shown that the proposed adaptive controller achieves torque tracking regardless of the trajectories of input signals. Moreover, the adaptive controller does not rely on the modeling of the mechanical load, and that makes control implementation simple and modular. Experimental results obtained from the McGill/MIT Motor have demonstrated that Motor torque converges to the command torque.
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Adaptive Suppression of Torque Harmonics in Brushless Motors
Volume 4: ASME IEEE International Conference on Mechatronic and Embedded Systems and Applications and the 19th Reliability Stress Analysis and Failure, 2007Co-Authors: Farhad AghiliAbstract:Accurate torque control of a Brushless Motor requires the Motor’s torque characteristics, which can be captured by a periodic function in Motor angle. This paper presents a direct adaptive controller for torque control of Brushless Motors, which estimates the Fourier coefficients of the periodic function based on the measurements of Motor phase voltage and angle. It will be analytically shown that the proposed adaptive controller achieves torque tracking regardless of the trajectories of input signals. Moreover, the adaptive controller does not rely on the modeling of the mechanical load, and that makes control implementation simple and modular. Experimental results obtained from the McGill/MIT Motor have demonstrated that Motor torque converges to the command torque.Copyright © 2007 by The Government of Canada
Yuhui Shi - One of the best experts on this subject based on the ideXlab platform.
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predator prey brain storm optimization for dc Brushless Motor
IEEE Transactions on Magnetics, 2013Co-Authors: Haibin Duan, Yuhui ShiAbstract:Brain Storm Optimization (BSO) is a newly-developed swarm intelligence optimization algorithm inspired by a human being's behavior of brainstorming. In this paper, a novel predator-prey BSO model, which is named Predator-prey Brain Storm Optimization (PPBSO), is proposed to solve an optimization problem modeled for a DC Brushless Motor. The Predator-prey concept is adopted to better utilize the global information and improve the swarm diversity during the evolution process. The proposed algorithm is applied to solve the optimization problems in an electromagnetic field. The comparative results demonstrate that both PPBSO and BSO can succeed in optimizing design variables for a DC Brushless Motor to maximize its efficiency. Simulation results show PPBSO has better ability to jump out of local optima when compared with the original BSO. In addition, it demonstrates satisfactory stability in repeated experiments.
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Predator–Prey Brain Storm Optimization for DC Brushless Motor
IEEE Transactions on Magnetics, 2013Co-Authors: Haibin Duan, Yuhui ShiAbstract:Brain Storm Optimization (BSO) is a newly-developed swarm intelligence optimization algorithm inspired by a human being's behavior of brainstorming. In this paper, a novel predator-prey BSO model, which is named Predator-prey Brain Storm Optimization (PPBSO), is proposed to solve an optimization problem modeled for a DC Brushless Motor. The Predator-prey concept is adopted to better utilize the global information and improve the swarm diversity during the evolution process. The proposed algorithm is applied to solve the optimization problems in an electromagnetic field. The comparative results demonstrate that both PPBSO and BSO can succeed in optimizing design variables for a DC Brushless Motor to maximize its efficiency. Simulation results show PPBSO has better ability to jump out of local optima when compared with the original BSO. In addition, it demonstrates satisfactory stability in repeated experiments.
K.t. Chan - One of the best experts on this subject based on the ideXlab platform.
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Novel wide range speed control of permanent magnet Brushless Motor drives
IEEE Transactions on Power Electronics, 1995Co-Authors: C.c. Chan, J.z. Jiang, W. Xia, K.t. ChanAbstract:This paper presents a novel approach for the wide range speed control of a permanent magnet (PM) Brushless Motor drive, including both sinewave and squarewave versions. As compared with conventional flux-weakening control, the approach has definite advantages in that it can be applied to the squarewave PM Brushless Motor drive directly, and even to the Motor drive with negligible mutual inductances between phase windings. Moreover, it is easier to implement than flux-weakening control because no coordinate transformation is needed. The key of this approach is to make use of the transformer EMF in such a way that it weakens the rotational EMF when the Motor operates above the base speed, leading to the achievement of constant-power operation. Computer simulation and experimental results show that the proposed approach works well. >
