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To solve the detection of rotor position and speed of brushless DC (BLDC) motors in sensor-less position control system, an improved estimation method of rotor position and speed based on nonsingular fast terminal sliding mode and high order sliding mode observer is proposed. The results of simulation illustrate that the developed hybrid sliding mode observer can accurately estimate the rotor speed...
In this paper, ANSYS POLYFLOW with finite element-based was adopted for the three-dimensional flow-field simulation in the rubber mixing process, and integrated with the methods including overlapping grid, Picard iteration and time-stepping scheme. The viscosity field cloud-picture in cycle process of rubber-mixing was obtained, and then the mixing-field characteristics under different process parameters...
In this paper, an adaptive flux observer is designed for a speed sensorless direct torque controlled induction motor drive in which the rotor resistance value is updating during operation and a new speed-adaptive law is given. By using robust control theory, the constant observer gain is obtained by solving two bilinear matrix inequalities. The stability of the flux observer is ensured in a sufficiently...
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