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Nowadays the majority of applications are demanding more and more compact, cost effective and robust solutions for their electric drives. In this context permanent magnet synchronous machines are considered as a good candidate due to their high torque density. This torque density is obtained thanks to high power rare earth magnets with both high remanence and high coercive force. However, the magnets...
This paper presents the performance evaluation of a Permanent Magnet Synchronous Machine (PMSM) under various dynamic changes with sensorless speed detection. Speed and rotor position of the motor is calculated indirectly from the machine parameters. A new control algorithm which is a Modified Sliding Mode Control (MSMC) has been proposed and machine drive performance have been evaluated using (MSMC)...
This paper presents a design and comparative study of backstepping and adaptive nonlinear control for variable wind speed energy conversion system based on a permanent magnets synchronous generator. The adaptive Backstepping control is applied in order to extract the maximum energy from wind by the high tracking performance of speed control. The main contribution of this control is the robustness...
This paper deals with the synthesis, design, and comparison of robust H-infinity (H∞) and RST position controllers of Piezoelectric Actuator Drive (PAD). The PAD is an accurate rotary piezoelectric motor that employs the elongation of stack actuators, the micro-toothed ring and the shaft to generate rotation motion. The motor position depends on precise adjustment between motor ring and shaft and...
Switched Reluctance Motor has a strong candidature for the variable speed drive operation. The performance of the drive is enhanced by controlling the speed with a PI controller to reduce the speed ripple which in turn leads to reduced torque ripple. The classical PI controller offers many features like less settling time, fast control, low-cost application but suffers from less stability. To overcome...
Direct torque control (DTC) is a well-known method for ac induction motor (IM) drive systems. This approach is based on estimating stator flux and torque. So, accurate flux estimation is one of the fundamental key components of DTC drives. In this paper, an improved stator flux estimation technique based on the voltage model with stator flux and stator current errors as feedbacks is introduced. The...
The stator flux estimation is the framework of direct torque control technique (DTC) method. The accurate estimated flux grantees the desirable sensorless drive function. There are different methods for flux estimation that the voltage model is simplest ones. These methods are sensitive to the stator resistance; therefore have poor performance and incorrect estimated flux at very low speed. In this...
In this paper, for modifying the transient state and improving dynamic response, an intelligent control method, namely, brain emotional learning based intelligent controller (BELBIC) is used in cascade with a PI conventional controller to control the switched reluctance motor torque indirectly. In the proposed method, the output of the PI controller is compared with the estimated machine torque and...
This article presents an experimental realization of adaptive backstepping control methodology on a cascaded buck converter permanent magnet dc (PMDC)-motor combination for angular velocity control. The experiment aims at illustrating the practical applicability of adaptive control to power converters fed with a DC motor load. The systematic design procedure of conventional backstepping control design...
This paper presents a comparative study of different speed controllers for PMSM: conventional proportional integral (PI) controller, neural network (NN) and controller adaptive PI controller using gradient descent method. The dynamic response of PMSM with the proposed controllers is tested and validated under simulations with presence of variations of parameters of the machine and face to load disturbances.
This paper deals with the induction machine's control inside a field oriented control (FOC) plan, a fractional order proportional integral (FOPI) controller is applied to ensure the speed control. PI and FOPI controllers have the similar structure but the fractional controller considers fractional integration orders in concluding the control action. Thanks to the fractional order integral we can get...
Electric traction can be considered as one of the promising technologies towards significant improvements in performance & efficiency of vehicle, energy utilization and polluting emissions. The induction machine (IM) is usually selected as work horse of traction industry because of its most suitable torque-speed characteristics. In the present context the regenerative braking is considered to...
In this paper, a novel robust adaptive controller is proposed to simultaneously cope with the unknown nonlinear backlash, friction and dynamic uncertainties in the 3-DOF robotic head system. Inverse backlash compensation with on-line backlash parameter estimation and model-based friction compensation with off-line Stribeck friction identification are incorporated into this robust adaptive scheme....
The sensorless high speed-tracking control problem for a surface-mount permanent magnet synchronous motor via stator currents and voltages measurements is tackled, by interconnecting an H∞-controller and a reduced order sliding-mode observer. The observer-control scheme is robust against external load disturbances. The rotor position and speed variables are estimated in finite time by means of a reduced...
In this paper, the problem of robust H∞ tracking control for 6 DOF spacecraft formation flying in the presence of parameter uncertainties, external disturbances and input saturation is addressed. Firstly, a robust H∞ controller constructed by the solution of the Hamilton-Jacobi-Inequality(HJI) is proposed. It is proved that the coupled 6 DOF tracking error system is stable and robust in respect to...
In this paper, a sensorless output feedback controller is designed and developed for the Induction Motor (IM), without using of flux and speed sensors. Firstly, a new sliding mode observer that uses only the measured stator currents is synthesized to estimate the speed, the flux and the load torque. Secondly, a backstepping control is developed so as to steer the estimated speed and flux magnitude...
The paper presents a novel robust field oriented vector control for induction generators. The proposed controller exploits the concept of indirect field orientation and guarantees asymptotic DC-link voltage regulations when DC-load is constant or slowly varying. An output-feedback linearizing Lyapunov's based technique is employed for the voltage controller design. Flux subsystem design provides robustness...
The AC drives direct torque control (DTC) is used to obtain high performance decoupled torque and flux control. The SVM based direct torque control is a common solution which used to solve the conventional DTC's problems such as the high torque ripples and variable switching frequency. However, this control technique bases on stator flux orientation and PI controllers. This paper aims to improve the...
This paper presents an adaptive sliding mode controller for quadrotor trajectory tracking in presence of uncertainties and disturbances. An exponential reaching law is implemented using the gain adaptation control, which has the advantage of not requiring the knowledge of the upper bound of the lumped uncertainties and external disturbances. Numerical simulation results are provided to illustrate...
Impedance control offers a theoretical basis for safe interaction between a robot and the environment, but model uncertainty, disturbances and actuation dynamics can compromise the accuracy of the rendered impedance in implementation. If both the interactive force and motion are directly sensed, the relationship between them can be robustly regulated to present the desired impedance dynamics. In this...
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