Unpredictable plant parameter variations, external load disturbances and nonlinear dynamics which exist in ring permanent magnet torque motors (RPMTM) seriously deteriorate the drive performance of ...system at low speeds. A model reference sliding mode control scheme which features good robustness against parameter variations is proposed in this paper firstly. Then a neural network load torque observer is presented to observe and compensate external load disturbances. The analysis, design and simulation of the proposed model reference sliding mode control scheme controller and neural network load torque observer are described. Simulation results show that good control performance, both in the command-tracking and the load-regulating characteristics of the rotor position, is achieved.
Linear feed system of high precision and high speed CNC machine tool is direct driven by Permanent magnet linear synchronous motor (PMLSM). In order to reduce transient vibration of machine tool ...caused by PMLSM in start and stop with high speed change, the jerk motion profile of PMLSM was designed by using sinusoidal curve without any abrupt corner. An objective function was minimized which was composed of execution time and integral of the squared jerk. The kinematic and physical limitations of PMSLM were considered in the optimal proceeding. Compared with other motion planning, the simulations of results show that propose planning has reduced vibration with same execute time.
Combined effects of Fenton peroxidation and CaO conditioning on sewage sludge thermal drying Liu, Huan; Peng LiuauthorState Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China; Hongyun HuauthorState Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China ...
2015
Journal Article
