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A full cycle pulse current peak envelope sensorless technique is presented in the paper, using the pulse injected and the chopper control mode with fixed chopping falling time for the rotor position detected. The high frequency pulse injected in the non conducting region, the chopper control mode in the conducting region, the discrete peak values of the pulse current are detected, the full cycle pulse...
This paper proposes a super twisting sliding mode control technique for linear induction motors (LIMs) with unknown load torque, taking into consideration the dynamic end effects. First, LIM's dynamic end effects are presented by Ducan's T-model, then following this model is controlled by a designed super twisting controller (STC) for flux tracking and speed tracking purpose. Simultaneously, an open...
A rotary engine with rectangle pistons and cylinders is claimed to have higher mechanism efficiency for eliminating the lateral force between piston skirt and liner. Constrained by the present machining and assembly accuracy, surfaces of piston could not fit the internal surface of cylinder well which might lead to gas leakage from cylinder. A novel ring used to seal rectangular cylinder was invented,...
A disturbance accommodating Linear Quadratic Regulator (LQR) method was applied in pitch control system to achieve good performance. The disturbance can be estimate by designing state estimator, and a feedback was added into the input to eliminate disturbance effect. The feed back matrix was calculated in accordance to LQR theory. A wind turbine dynamic modal was set up, and simulation of the control...
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