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In this article is presented and analyzed a new control system of the coal flow on the scrapers conveyor in a longwall mining system. The control of the coal flow on the scrapers conveyor, is carried out with the aid of a cascade control system. Electrical drive system of the advance and the cutting mechanism, of the longwall shearer, is done by means of induction motors. The control of speeds and...
This paper presents the experimental implementation of V/f scalar control for a three-phase squirrel-cage induction motor. The principal goal is to control the rotation speed set by a reference and to maintain it despite the presence of disturbances. Two implementation methods were developed: Open-loop scheme, which is commonly used in industry, and closed-loop scheme, less used but it offers higher...
The miniaturization trend of electric machines increases the demand for higher rotational speeds to provide a desired mechanical power level at decreased size. To push the limits of rotor miniaturization, new concepts for an ultra-high speed motor are researched, which employs sub-millimeter size rotors and is capable of achieving rotational speeds above 25 million rotations per minute (Mrpm). The...
Energy efficiency in pumping is affected by the motor efficiency. This paper studies the applicability of common electric motor types to an industrial pumping system by comparing the motor efficiency characteristics with each other, and by analysing how the motor efficiency and sizing affect the resulting pumping system energy consumption with a standard load profile. The objective of the paper is...
Induction motor is an electric motor which has many advantages. One of them is robust and relatively cheap. But has some disadvantages in the regulation of speed, because of that, the system need smart control to operated the induction motor. in this case used Backstepping control as intelligent control to maximize the performance of induction motor. In this method Indirect Field Oriented Control...
This paper presents the development of a cosimulation platform of induction motor direct torque control (DTC) drive. This paper provides advanced modeling and simulation tool for induction motor drive. The proposed simulation platform allows a coupled analysis that links finite element analysis (FEA) with the simplorer for the more realistic simulation, analysis and validation. With the help of finite...
In this paper, the cage-rotor induction motor and the matrix-rotor induction motor, which are driven at the same rotational speed, are analyzed using the three-dimensional finite element method, and the characteristics of these motors are compared with each other.
The paper deals with the fault tolerant Direct Torque Control of an induction motor drive. Influence of the speed sensor faults to the properties of the DTC-SVM drive system is presented. Control structure with and without outer speed control loop is analyzed. Simple algorithmic mechanism of the speed sensor fault detection is described. During the faulted conditions vector controlled drive is switched...
A novel ADRC control structure which employs only three first-order ADRCs is presented for the speed control of induction motor drives, moreover, compared with the existing ADRC based speed control structures there is no need to estimate the rotor flux. As a result, the runtime of the proposed ADRC control algorithm is shorter than ever and the implementation of it on DSPs is easier than ever. The...
The paper presents a fuzzy logic speed control system based on fuzzy logic approach for an indirect vector controlled induction motor drive for high performance. The analysis, design and simulation of the fuzzy logic controller for indirect vector control induction motor are carried out based on fuzzy set theory. The proposed fuzzy controller is compared with PI controller with no load and various...
This paper presents a new scheme for induction motor control. First the feedback sliding mode linearization control is applied to induction motor in order to separate the control of the rotor speed and flux square. Once the two physical outputs reach their reference, the machine control is performed by an H∞ controller. We detail, in this paper, how to design the H∞ controller to guarantee the robust...
This paper presents a Genetic Algorithm (GA) based fast speed response controller for poly-phase induction motor drive. Here the proportional and integral gains of PI controller are optimized by GA to achieve quick speed response. An adaptive Recurrent Neural Network (RNN) with Real Time Recurrent Learning (RTRL) algorithm is proposed to estimate rotor flux. An online tuning scheme to update the weight...
This paper presents a novel fast speed response control strategy for the poly-phase induction motor drive system based on flux angle. The control scheme is derived in rotor field coordinates and employs the estimation of the rotor flux and its position. An adaptive notch filter is proposed to eliminate the dc component of the integration of signals used for the rotor flux estimation. To improve the...
In the traditional direct torque control (DTC) of induction motor, the low order harmonic component of stator current is very large when the motor is running at low speed. It leads to high torque ripple of motor in low speed. To solve this problem, a new control method has been proposed in this paper. Base on the traditional DTC method, electromagnetic torque and flux models have been analyzed. To...
This paper presents the experimental test results of the independent vector control characteristics of two three-phase permanent magnet synchronous motors (PMSMs) fed by a five-leg inverter (FLI). Recently, the use of PMSM is more and more spreading in industrial field. It has the features of saving-weight and high-efficiency compared with DC motor and induction motor. The maximum feature of the PMSMs...
This study presents bi input-extended Kalman filter (BI-EKF) based speed-sensorless direct torque control (DTC) of induction motors (IMs). For this aim, all states required for the speed-sensorless control system as well as commonly known parameter uncertainties related to stator resistance Rs, rotor resistance R'r, and load torque tL including also viscous friction term have been estimated by using...
The paper is concerned with the study of the speed control loop of an ultrahigh speed machine applied in the utilisation of renewables and in recovering waste energy. The rated speed of the machine is 90 000 rpm. The main target is to prevent the overspeed of the machine set by studying with simulation the response of the nonlinear speed control loop by taking into consideration both the mechanical...
Researches on the steering regenerative brake torque control of dual-motor drive for electric tracked vehicle. Steering dynamic model of tracked vehicle was made up, steering regenerative brake torque control strategy of induction motor based on rotor flux oriented and complex speed-torque control method of steering regenerative braking of dual-motor were proposed, and energy feedback produced by...
The Volts-per-Hertz controller is designed to accommodate the variable speed commands by using the invertor to apply a voltage of correct magnitude and frequency so as to approximately achieve the commanded speed without the use of speed feedback. The studies are focused first with of open-loop and then with the closed-loop with the application of slew rate. Results show that the slew rate reduces...
The dynamics of the induction motor drive can be made independent of the position as well as speed control by using the field oriented control strategies. There are various techniques available under this category. One of such strategies is Indirect Field-Oriented Control method for the Induction motor drive. The speed control is observed in both, open-loop and closed-loop control applications. The...
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