Ali Monadi

A simple vector control technique for 3-phase induction motor under open-phase fault based on GA for tuning of speed PI controller

This paper discusses a simple vector control technique for vector control of faulty 3-phase Induction Motor (3-phase IM under open-phase fault) based on Rotor Flux-Oriented Control (RFOC). It is shown in the adapted system for vector control of the faulty IM, it is essential for the speed PI controller coefficients to modify. For this reason, Genetic Algorithm (GA) is employed for tuning of speed PI controller. The results of this study show that the proposed drive system have acceptable good speed and torque responses.

Fault-tolerant control of 3-phase IM drive (speed-sensor fault and open-phase fault)

In this paper, a fault-tolerant control strategy dedicated to star connected 3-phase Induction Motor (IM) is presented. The presented method is able to control 3-phase IM drive under healthy, speed-sensor fault and open-phase fault conditions. The proposed fault-tolerant control system is derived from an Extended Kalman Filter (to compensate speed-sensor fault) and two developed Field-Oriented Control (FOC) algorithms (to compensate open-phase fault). The performance demonstrated by the simulation results shows that, in comparison with conventional FOC, the proposed approach, provides an accurate vector control and good dynamic performance particularly in reduction of motor speed and torque oscillations.

Modeling and speed estimation of a faulty 3-phase induction motor by using extended Kalman filter

This paper presents a modeling technique for a faulty 3-phase Induction Motor (3-phase Induction Motor IM under open-phase fault). The developed model has the same structure of equations as the balanced 3-phase model. It is shown that the model can be utilized to estimate the speed of a faulty IM based on an Extended Kalman Filter (EKF) estimation technique, which was developed for a balanced 3-phase IM. Simulation and experimental results are presented to show the validity of the proposed techniques.

Experimental evaluation of FOC of 3-phase IM under open-phase fault

ABSTRACT This paper presents an investigation of a novel Field-Oriented Control (FOC) performance for star-connected 3-phase induction motor (IM) drives with an open-phase fault. The control system enables to work in healthy and faulty conditions without requiring any modifications to the conventional control structure but with modifications only in the control parameters. This introduced control topology leads to the mitigation of any speed and torque oscillations resulting from the asymmetrical conditions related with this type of fault. A comparative study for vector control strategy using the proposed and conventional methods is experimentally verified.

Speed estimation of faulty three-phase induction motor using model reference adaptive system

In this paper, a method for speed estimation of faulty three-phase induction motor (three-phase induction motor under stator winding open-phase fault) based on Model Reference Adaptive System (MRAS) is presented. The proposed method can be used for both healthy and faulty induction motors. In this method during normal condition the conventional MRAS is used to estimate motor speed. However, during the fault condition the conventional MRAS is switched to the novel algorithm based MRAS. This novel algorithm is designed based on the model of three-phase induction motor under open-phase fault. Simulation results are presented to show the effectiveness of the proposed technique. This paper also compares the performance of conventional and proposed MRAS during open-phase fault.

Analytical calculation of the RFOC method in single-phase induction motor

ABSTRACT This study discusses the different techniques for speed control of single-phase induction motor with two asymmetrical main and auxiliary windings based on Rotor Field-Oriented Control (RFOC) method. In the presented methods, transformation matrices are introduced and applied to the equations of single-phase induction motor. It is shown by applying these rotational transformations to the unbalanced equations of single-phase induction motor, equations of single-phase induction motor are transformed into symmetrical equations. These rotational transformations are achieved based from the steady-state equivalent circuit of single-phase induction motor. Finally, a method for RFOC of single-phase induction motor is proposed. Results show the good performance of the proposed method.