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NBR is often used as the stator materials of Submersible Progressive Cavity Pump (SPCP). Its premature failure is the main reason to shorten SPCP working life. This article compared the wear resistance of the same hardness NBR and FKM and its ratio blends 2:8, 3:7, 5:5, 7:3, 8:2, before and after swelling in crude oil medium. Swelling experiments soak cycle for 72 hours, the temperature of 50±2°C...
An adaptive speed PID controller based on RBFNN is investigated for PMSM servo system in this paper. RBF is used to identify the plant first. Then the Jacobian information of controlled plant obtained by RBFNN identification is used to adjust the gain of speed PID controller on-time. A robust parameters self-tuning learning algorithm is adopted to train the ANN for fast convergence. Simulation result...
A nonlinear position controller for permanent magnet synchronous motor (PMSM) was designed to achieve position tracing control and robust control. The controller included two parts: the model controller and the robust controller. The former was designed to ensure a desired reference output trajectory, and the later was devised to realize the robust control against PMSM parameter variations and load...
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