This paper presents the design, analysis, and sensorless control of a new self-decelerating permanent-magnet (PM) machine based on magnetic-gear. The key is to integrate the magnetic gear with the PM machine while rem...
详细信息
ISBN:
(纸本)9781467324199
This paper presents the design, analysis, and sensorless control of a new self-decelerating permanent-magnet (PM) machine based on magnetic-gear. The key is to integrate the magnetic gear with the PM machine while removing the gear inner rotor. Hence, the proposed motor can achieve the low speed high torque output and high speed compact design requirements as well as high torque density with a simple structure. By using the finite element analysis (FEA), the static characteristics of the proposed motor are analyzed. In order to resolve the problems of using the mechanical sensors, various sensorless control algorithms for estimating rotor speed have been proposed. A method of modelreferenceadaptive system (MRAS) for sensorless control of this new self-decelerating PM motor is described, and the simulation results demonstrate the validity of this proposed algorithm.
In this research, the positioning control of a water hydraulic servo cylinder system with the simple adaptivecontrol (SAC) is discussed. Conventional model reference adaptive control (MRAC) also achieves good trackin...
详细信息
ISBN:
(纸本)9781467312752
In this research, the positioning control of a water hydraulic servo cylinder system with the simple adaptivecontrol (SAC) is discussed. Conventional model reference adaptive control (MRAC) also achieves good tracking performance for cylinder control, but the controller structure is much more complicated and has less robustness for disturbance in real application. Compared with MRAC, SAC has simpler and lower order structure, i.e. higher feasibility. In this paper, we examined and evaluated the control performance of SAC on a water hydraulic servo cylinder system. With the recent increased concerns over global environmental problems, the water hydraulic technique using pure tap water as a pressure medium has become a new drive source comparable to electric, oil hydraulic and pneumatic drive systems. This technique is also preferred due to its high power density, high safety against fire hazard in production plants, and easy availability. However, the main problems for precise control in a water hydraulic system are steady state errors and overshoot due to its large friction torque and considerable leakage flow. To compensate these effects, MRAC had been already applied and the better control performances were obtained. However, no result has been reported on SAC application for water hydraulics. To make clear the merits of SAC, tracking control performance and robustness were discussed via experimental results. It was confirmed that SAC gives 1) better tracking performance compared with PI control, and 2) comparable control precision with MRAC within 70 micrometers to the reference position and higher robustness for parameter change despite simple controller. These results ensure wider application of simple adaptivecontrol in real mechanical system.
In this paper, the nonlinear control problem of wind turbine for maximum power extraction is addressed. In the proposed method, based on nonlinear dynamic inversion (NDI) and model reference adaptive control (MRAC), a...
详细信息
In this paper, the nonlinear control problem of wind turbine for maximum power extraction is addressed. In the proposed method, based on nonlinear dynamic inversion (NDI) and model reference adaptive control (MRAC), a two stages adaptivecontroller is designed to track the desired rotor speed. At the first stage, using NDI, nonlinear dynamics of the system is transferred to a linear relation and in the second stage, using MRAC, desire reference is tracked. In this approach, in addition to tracking of the desired reference in steady state, using three parameters, the transient response of the overall system can be controlled too. Simulations show the effectiveness of the proposed method compared to standalone NDI controller.
暂无评论