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In this paper, a 3 degree-of-freedom bearingless permanent magnet motor with axial active suspension is proposed. The structure and suspension principle of this novel bearingless permanent magnet motor are described in detail and its suspension mathematical models are constructed. Based on the mathematical models, a control system is designed for the new type bearingless permanent magnet motor. The...
This paper represents an approach for modelling the double stator induction machine dynamic steady taking into account an arbitrary displacement between the two three-phase windings sets. This analysis is treated with a simple d-q analytical model of a DSIM in which the effect of the mutual leakage inductance between the two three-phase winding sets has been included. Quantitative analysis for the...
In this paper, the application of Particle Swarm Optimization (PSO) on the optimization of the membership functions and the sliding surface constants of the decentralized fuzzy sliding mode controller (FSMC) is presented. This technique is used in order to find an optimal, decentralized, intelligent controller for a nonlinear aerodynamic, Twin Rotor Multi-input, multi-output System (TRMS). Simulation...
In this paper, a model of a three-shaft gas turbine which is based on modular modeling method has been founded by MATLAB/Simulink to study its performance. By combining the least-square and neural-network method in the process of modeling, we fit the gas turbine characteristics, and get a more accurate characteristic curve. Finally, according to experimental data in some working conditions, we calculate...
This paper employs a nonlinear disturbance observer (DOB), developed recently, to design a robust trajectory tracking controller for quadrotors. We prove that the proposed controller recovers the performance of the nominal closed-loop system under parameter uncertainties and disturbance torques. The results are validated through simulations and compared with a previous approach.
Based on the former adaptive blade pitch control method of the Electrically Controlled Rotor in time domain, two improved control algorithms are proposed. One method is through adding a weight-constrained function for active control filter, which can prevent the divergent of control system caused by interference signal of error channel. The other method is through adding a desired signal of scaling...
This paper presents a control algorithm used to control attitude and altitude of a four-rotor hovercraft developed at AIT, using sliding mode control with adaptive sliding surface technique. The craft is controlled to float in horizontal attitude at the desired heading direction and the desired floating height. The simulation results show that the proposed control algorithm can control the craft efficiently.
In this paper, different Model Reference Adaptive System (MRAS) based speed estimation methods are presented for a stand-alone Doubly Fed Induction Generator (DFIG) operating in the Variable Speed Constant Frequency (VSCF) mode. Among different MRAS based speed estimation techniques, stator flux based, rotor current based and reactive power based methods are compared in terms of their speed tracking...
This paper presents an application of a Takagi Sugeno (TS) Fuzzy logic based adaptive Iterative Learning Controller (ILC) to reduce chattering, torque ripple and to improve dynamic performance of a feedback linearized induction motor drive with sliding mode controller for periodic speed tracking. This ILC is connected to the forward path of sliding mode speed control loop. At first, the state feedback...
In this paper, a direct load angle (DLA) control method for three phase induction motor drives is proposed. It is based on control of incremental change in load angle. This method offers constant switching frequency at different operating conditions. The torque control is achieved without losing the benefits of direct torque control (DTC) by reference stator flux angle, which is sum of load angle...
The state observer is applied to measure the system state under certainty conditions. High performance closed loop control of a two-phase hybrid stepping motor needs accurate position information, but position sensors are restricted by the resolution, there will be quantization error in the position measurement, and the system dynamic performance is poor. In this paper, an asymptotic observer is proposed...
Starting control is the key problem of switch reluctant motor control. The follow-up process is as important as the starting. This paper research on this problem, using matlab to simulate the SRM model. With two phase start-up method‥Analysis of the current, torque, speed and other parameters. Achieved good result and waveform. Improved system starting ability.
This paper establishes a variable pitch system working force mathematical model by analyzing variable pitch wind turbine blade stress, and designs its closed-loop PID controllers combined with the actual pitch system. a fuzzy adaptive PID loop control is introduced in the variable pitch system position loop, compares with simulation torque curves which were produced by the fuzzy adaptive PID algorithm...
A general simulation model of the line-start single-phase capacitor-start, capacitor-run permanent-magnet motor (LSSPPM) is constructed by using Simulink in MATLAB according to the analysis of its mathematical model. A user-friendly interactive man-machine interface is designed after masking the model. Finally, the validity of the simulation model is tested and verified via a simulation experiment.
According to the mathematical model of asynchronous motor combined with the basic theory of the rotor field-oriented two phase synchronization reference frame, simulation model is established under the environment of MATLAB/Simulink. The result of simulation curve agrees well with motor torque-speed characteristic curve inherent consistent, so it is confirmed the correctness of this simulation model.
Pitch control system is the most important part of wind turbine to keep the rotor speed within its design limit. Large scale wind turbines usually adopt PI controller to adjust rotor speed above the rated wind speed. Since wind turbine system is a high-order nonlinear system, one set of PI parameters can't achieve excellent control performance, especially when wind turbulence is very strong. In view...
The working principle of magnetic particle clutch was deeply analyzed and an analysis model electromagnetic field of magnetic clutch was established. The finite element Method calculation of electromagnetic field in magnetic particle clutch and experimental verification was completed. Theoretical analysis anatomies with test results, which shows that simulation method and theory is reasonable and...
The paper presented a control scheme for parallel drive system of double Switched Reluctance machines. The sliding mode control algorithm is adopted in the main controller for closed-loop rotor speed control of main machine. The sliding mode control algorithm is also adopted in the subordinate controller for synchronized rotor speed and loads equilibrium distribution between main machine and subordinate...
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...
In the vector control of a permanent magnet synchronous motor (PMSM), the adequate control of the d-axis stator current component is important to achieve an efficient energy consume, and to increase the speed above the nominal value through flux-weakening method. This paper presents a simple a non-linear d-axis current controller which uses the mechanical speed, the q-axis stator current and a correction...
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