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Electronical power and control systems can decisively influence the performance of the piezoelectric engines and actuators. This paper presents the modeling of some ultrasonic motor and the role of some equipments that amplifies signals of variable frequency with the lower limit of 20 kHz and various wave forms, in order to obtain new performance in using the types of engines achieved in the Research...
This paper deals with the analytical description of an interior permanent magnet synchronous motor running in six-step conduction mode. It assumes a non-sinusoidal back emf, but inductances vary sinusoidally with the rotor position. The proposed model renounces Park's transformation and delivers a set of equations which allow the numerical simulation of phase currents and torque in the abc reference...
We continue to consider the question of what language features are needed to effectively model cyber-physical systems (CPS). In previous work, we proposed using a core language as a way to study this question, and showed how several basic aspects of CPS can be modeled clearly in a language with a small set of constructs. This paper reports on the result of our analysis of two, more complex, case studies...
Directional Steering Systems (DSS) have been developed in the oil and gas industry to achieve high well production when compared to conventional drilling systems. In this paper a dynamic modeling of a DSS using four DC motors was developed. A controller was designed using Feedback Linearization technique for the cancellation of non-linear dynamics and LQR for the optimal linear control. Simulation...
In order to facilitate exchanging and sharing data between the domestic and international main tools for power system electromechanical transient analysis, this paper analyzes and compares the common mathematical models for transient stability including synchronous generator, excitation system, turbine and governor, load and even DC transmission system in PSD-BPA and PSS/E. Several typical problems...
Taking the small unmanned four-rotor as a research object, the dynamic model of the small four-rotor was built according to Newton-Euler formaLism. Adaptive Inverse Control (AIC) Theory was used in the control of the small unmanned four-rotor for the first time and the attitude stabiLization control of the small unmanned four-rotor was reaLized on the experimental platform. The simulation results...
On the basis of the mathematical model, the equations have been derived. They are simulated by VB program language. The residence time and the position of a particle at any moment can be defined according to rotational speed of the rotary dryer, radius of the drum, the slope of the drum, wind-force and the particle quality. Simulated results are satisfactory.
Centrifugal compressor is the vital part of many mechanical systems. The present paper deals with the simulation and the analysis of the fluid performance in two subsonic compressor stages under different rotational speed. The configurations used for the study is two subsonic centrifugal compressors with 60mm and 70mm diameter impeller wheels respectively. Numerical simulation is carried out with...
This paper explains a method to calculate the capacitance value of a 3-Ø cage induction motor working as a generator in the self-excited mode of operation. The synchronous impedance test method has been reviewed. The capacitance value is determined from the manufacturer data. The effect of voltage variation with different capacitances has been evaluated at constant speed. Performance of self-excited...
In this paper, design, dynamics and control allocation of Tri-Rotor UAV are introduced. Tri-Rotor UAV has three rotor axes that are equidistant from its center of gravity. There are two designs of Tri-Rotor introduced in this paper. Single Tri-Rotor UAV has a servo-motor that has been installed on one of the three rotors, which enables a rapid control on its motion and its various attitude changes;...
A detailed computer simulation for interconnecting wind energy system to an electric utility is presented. The proposed system consists of four high rating wind turbines each one uses double fed induction generator (DFIG). Two back to back bidirectional PWM inverters are used in the rotor circuit of each DFIG to be interfaced with the electrical utility. The simulation incorporates a flexible independent...
This paper presents a novel speed & position estimation algorithm for the PMSG based wind turbine using Adaptive Network-Based Fuzzy Inference System (ANFIS). The precise information of rotor speed and position is required to perform maximum power tracking in variable speed wind turbine, which is very difficult to estimate under varying operating conditions, as it may lead to parameter variation...
In the paper, the non-sensor control method of the sliding mode observer (SMO) was proposed and used for estimating the rotor position and speed of the Switched Reluctance Motor (SRM). Based on linear inductance model of SRM, the motor position and speed of the SRM was estimated by the phase voltage and current. With the soft of Matlab-Simulink, a simulation model with the SMO for the SRM was built...
In this paper, maximum torque per ampere (MTPA) control strategy is proposed for a special machine called dual mechanical ports (DMP) electric machine. In the conventional hybrid electrical vehicles (HEV), this machine is replaced to planetary gear box and two electric machines and makes their structures simpler. The proposed MTPA strategy fully utilizes the reluctance torque and maximizes the torque...
The use of voltage source inverter (VSI) in high performance drives removes the restriction of the number of motor phases. Due to the reported advantages of multi-phase machines they have become of increasing interest to the industry. This paper provides a Matlab/Simulink built n-phase machine model in terms of physical variables along with the VSI and V/f control scheme that a user can easily set...
Electromagnetic clutch is a new kind of magnetic mechanism which has the unique advantages of non-contact and flexible transmission, low noise and lubrication, and inherent overload protection. A novel structure non-contact electromagnetic clutch which adopts the magneto resistive effect is introduced in this paper. Research on principle analysis and all steady and dynamic state characteristics were...
This paper presents modeling, characterization and control of SPMSM under loaded conditions i.e. saturation. Determining the rotor flux position of PMAC machines under no-load is relatively trivial since it is directly related to the rotor position. However under loaded condition, saturation in particular, the flux is comprised of two components: one due to the rotor magnets and the other due to the...
The paper purpose is to dignify some aspects regarding the calculus model and technical solutions for surveillance system based on self-supporting gyroplane used to local observations and scientific equipment carrying. The calculus methodology consists in numerical simulation of different gyroplane evolution. The gyroplane model which will be presented has six DOF and autonomous control system. The...
The permanent magnet synchronous motor (PMSM) is increasingly playing an important role in alternating current transmission system. Recently, lots of researches have been investigated for the PMSM system without speed and position sensors. A vector-control system of the improved MRAS for PMSM is proposed in this paper. The new Model Reference Adaptive System (MRAS) based on speed positive feedback...
The short-circuit current contribution of wind turbines has not received much attention so far. This paper establishes the doubly fed induction generator mathematical model and carried on corresponding short circuit analysis. Regarding the sudden short circuit process as a superimpose of steady state operation and transient state operation provoked by reverse voltage, stator three-phase short circuit...
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