In this paper, a novel maglev coupling based on the opposed Halbach array is proposed as interface between linear electro-mechanical converter and 2D valve body. This non-contact possesses several advantages over existing mechanical couplings such zero friction wear, low vibration noise, no lubrication, which expected to greatly improve control accuracy life cycle of valve. A detailed analytica...

Lateral tower vibrations of offshore wind turbines are normally lightly damped, and large amplitude vibrations induced by wind and wave loads in this direction may significantly shorten the fatigue life of the tower. This paper proposes the modeling and control of lateral tower vibrations in offshore wind turbines using active generator torque. To implement the active control algorithm, both th...

In this paper, an overview of the techniques applied to AC electric propulsion field has been done. Actual study cases of electric ship propulsion schemes are considered. An impartial comparison between three-level converters versus two-level converter from the viewpoint of electric ship propulsion requirements has been done. Diodeclamped three-level converters using direct torque control (DTC)...

The paper presents the transient analysis of a 1.7 MVA wind-power doubly fed induction generator (DFIG) connected to the network and controlled by modified direct torque control during power system disturbances. The finite element model of DFIG is coupled with circuit models of frequency converter, transformer, network and control part in Matlab-Simulink. The transient currents and electromagne...

mixing conditions of nbr/pvc nanocomposites such as mixing temperature, rotor speed and mixing time are determining parameters in rheological, mechanical and morphological properties of the compound. three levels were chosen for each parameter using design expert software via box-behnken method. the nanocomposite samples were melt-mixed in brabender internal mixer. the effect of various mixing ...

The paper discusses the design of optimised current waveforms, to give the lowest RMS current per phase for a given mean torque. The waveforms are constrained to be within the converter VA rating. Current waveforms and the associated voltage waveform, over a wide speed range, are given for a representative motor.

This paper presents the study of the electromagnetic torque harmonic distortion of a slip energy recovery system (SERS), whose converter is constituted by two thyristor bridges and no DC coil. A brief explanation of the circuit configuration will be made. To perform the harmonic study, a special Matlab code program was developed, with several special features. The influence of power electronic ...

Nowadays the control of stator voltage at a constant frequency is one of the traditional and low expense methods in order to control the speed of induction motors near its nominal speed. The torque of induction motor is a nonlinear function of the firing angle, phase angle and speed. In this paper the speed control of induction motor regarding various load torque and under different conditions ...

This paper proposes a regulation method of back-toback connected three-level converters in order to reduce the torque ripple in induction motor. First part is dedicated to the presentation of the feedback control of three-level PWM rectifier. In the second part, three-level NPC voltage source inverter balancing DC bus algorithm is presented. A theoretical analysis with a complete simulation of ...