The Experts below are selected from a list of 1290 Experts worldwide ranked by ideXlab platform
Jiabin Xu - One of the best experts on this subject based on the ideXlab platform.
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a dual three level inverter based open end winding induction motor Drive with averaged zero sequence voltage elimination and neutral point voltage balance
IEEE Transactions on Industrial Electronics, 2016Co-Authors: Di Wu, Xiaojie Wu, Liangcheng Su, Xibo Yuan, Jiabin XuAbstract:Two three-level inverters driving an open-end winding induction motor can generate equivalent voltage waveforms as a single five-level inverter-based Drive. In addition, it can bring in benefits such as reduced dc-link voltage, less number of devices, and fault-tolerant capability, which is favored in high-power motor Drive applications. The main challenge with this type of Configuration is the appearance of large zero-sequence current circulating between the two inverters, which generates extra losses in the switching devices and the motor as well as affects the normal operation of the machine. Another challenge is to balance the dc-link neutral point voltage of the two three-level inverters. This paper has proposed a simplified decoupled space-vector pulsewidth-modulation (PWM) strategy to eliminate the averaged zero-sequence voltage in each switching cycle by the placement of redundant vectors of each individual inverter using a time shift. Neutral point voltage balance is further achieved by adjusting the time duration of the redundant vectors. In this paper, it is shown that it is possible to operate this kind of Drive Configuration with a single dc power supply and achieve averaged zero-sequence voltage elimination and neutral-point voltage balancing at the same time. Experimental results of a 5.5-kW dual three-level inverter Drive using the proposed PWM strategy are presented, which validates the control method and Drive Configuration.
Thomas G. Habetler - One of the best experts on this subject based on the ideXlab platform.
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An impedance identification approach to sensitive detection and location of stator turn-to-turn faults in a closed-loop multiple-motor Drive
IEEE Transactions on Industrial Electronics, 2011Co-Authors: Siwei Cheng, Pinjia Zhang, Thomas G. HabetlerAbstract:A single closed-loop inverter Drive with multiple motors connected to it is a type of Drive topology commonly used in steel processing industry, electric railway systems, and electric vehicles. However, condition monitoring for this type of Drive Configuration remains largely unexplored. This paper proposes an impedance identification approach to detect and locate the stator turn-to-turn fault in a multiple-motor Drive system. Sensitive and fast fault detection is achieved by utilizing the characteristics of current regulators in the motor controller. Experimental results show that the proposed method can reliably detect and locate the stator turn fault on two shaft-coupled 5-hp induction machines under different operating conditions and fault levels with no need of any machine parameters. Although originally developed for multiple-motor Drives, the detection scheme can also be directly applied to most of the conventional closed-loop induction motor Drives.
Masayoshi Wada - One of the best experts on this subject based on the ideXlab platform.
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ROBIO - Studies on 4WD Mobile Robots Climbing Up a Step
2006 IEEE International Conference on Robotics and Biomimetics, 2006Co-Authors: Masayoshi WadaAbstract:In this paper, step climbing capabilities of wheeled mobile robots are studied in theory and experiments. For applying the mobile robot technologies to the actual applications such as personal scooters or wheelchairs, it is required that capability for overcoming rough terrains of conventional wheeled robots is improved. For enhancing the mobility of wheeled robots, new type of omnidirectional mobile platform with four-wheel Drive (4WD) mechanism is introduced. The mobile platform includes a pair of normal wheels on the rear side of the platform and a pair of omni-wheels on the front side. The normal wheel in rear and the omni-wheel in front, mounted on the same side of the base, are interconnected by a chain or a belt transmission to rotate in unison with a Drive motor, i.e. a synchro-Drive transmission. To rotate the robot body at the center of the mobile base about vertical axis, the third motor is installed on the platform. To estimate and verify the enhanced mobility of the proposed 4WD system, statics of a wheel-and-step system is analyzed and surmountable capabilities are tested in experiments not only for 4WD but also for a conventional rear-Drive Configuration. For the experiments, a 4-wheeled small vehicle is designed and built which equips four normal wheels two or all of that are Driven by two electric motors. In the experiments, the small vehicle with 4WD Drive Configuration overcomes a step more than three times of the conventional RD Configuration in the step height.
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Studies on 4WD Mobile Robots Climbing Up a Step
2006 IEEE International Conference on Robotics and Biomimetics, 2006Co-Authors: Masayoshi WadaAbstract:In this paper, step climbing capabilities of wheeled mobile robots are studied in theory and experiments. For applying the mobile robot technologies to the actual applications such as personal scooters or wheelchairs, it is required that capability for overcoming rough terrains of conventional wheeled robots is improved. For enhancing the mobility of wheeled robots, new type of omnidirectional mobile platform with four-wheel Drive (4WD) mechanism is introduced. The mobile platform includes a pair of normal wheels on the rear side of the platform and a pair of omni-wheels on the front side. The normal wheel in rear and the omni-wheel in front, mounted on the same side of the base, are interconnected by a chain or a belt transmission to rotate in unison with a Drive motor, i.e. a synchro-Drive transmission. To rotate the robot body at the center of the mobile base about vertical axis, the third motor is installed on the platform. To estimate and verify the enhanced mobility of the proposed 4WD system, statics of a wheel-and-step system is analyzed and surmountable capabilities are tested in experiments not only for 4WD but also for a conventional rear-Drive Configuration. For the experiments, a 4-wheeled small vehicle is designed and built which equips four normal wheels two or all of that are Driven by two electric motors. In the experiments, the small vehicle with 4WD Drive Configuration overcomes a step more than three times of the conventional RD Configuration in the step height.
Di Wu - One of the best experts on this subject based on the ideXlab platform.
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a dual three level inverter based open end winding induction motor Drive with averaged zero sequence voltage elimination and neutral point voltage balance
IEEE Transactions on Industrial Electronics, 2016Co-Authors: Di Wu, Xiaojie Wu, Liangcheng Su, Xibo Yuan, Jiabin XuAbstract:Two three-level inverters driving an open-end winding induction motor can generate equivalent voltage waveforms as a single five-level inverter-based Drive. In addition, it can bring in benefits such as reduced dc-link voltage, less number of devices, and fault-tolerant capability, which is favored in high-power motor Drive applications. The main challenge with this type of Configuration is the appearance of large zero-sequence current circulating between the two inverters, which generates extra losses in the switching devices and the motor as well as affects the normal operation of the machine. Another challenge is to balance the dc-link neutral point voltage of the two three-level inverters. This paper has proposed a simplified decoupled space-vector pulsewidth-modulation (PWM) strategy to eliminate the averaged zero-sequence voltage in each switching cycle by the placement of redundant vectors of each individual inverter using a time shift. Neutral point voltage balance is further achieved by adjusting the time duration of the redundant vectors. In this paper, it is shown that it is possible to operate this kind of Drive Configuration with a single dc power supply and achieve averaged zero-sequence voltage elimination and neutral-point voltage balancing at the same time. Experimental results of a 5.5-kW dual three-level inverter Drive using the proposed PWM strategy are presented, which validates the control method and Drive Configuration.
Eiji Shamoto - One of the best experts on this subject based on the ideXlab platform.
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Effective Torque Ripple Compensation in Feed Drive Systems Based on the Adaptive Sliding-Mode Controller
IEEE ASME Transactions on Mechatronics, 2014Co-Authors: Burak Sencer, Eiji ShamotoAbstract:Rotary or linear permanent magnet servo motor systems are widely used in mechatronics applications. When used in direct-Drive Configuration without any mechanical transmission, one of the bottlenecks in achieving precision positioning is the rejection of torque ripples, which are in the form of high-frequency harmonic disturbances varying with the operating condition of the servos. When attached to mechanical transmission, ripple disturbances occur due to misalignments, repetitive contact, or the process forces itself. In this paper, a robust adaptive sliding-mode control is proposed to reject harmonic disturbances in servo systems and attain accurate positioning. The overall sliding-mode control law is derived from the Lyapunov function without the switching condition allowing convenient implementation in a PID-like form. Effectiveness of the controller is demonstrated experimentally, where the ripple forces that occur due to mechanical contact in spur and worm-gear feed Drive servo systems are compensated successfully.
