SPEED SENSOR FAULT DETECTION AND DIAGNOSIS OF INDUCTION MOTOR USING FUZZY BASED FAULT TOLERANT ALGORITHM

This paper presents a three phase squirrel cage induction motor operates using indirect field control is used and speed sensor fault is diagnosis by fuzzy logic control. Induction motors are highly reliable, they are susceptible to many types of faults that can became catastrophic and cause production shutdowns, personal injuries, and waste of raw material. Induction motor faults can be detected in an initial stage in order to prevent the complete failure of the system and unexpected production costs. So,new fault tolerant algorithm is used to detect the faults and  diagnosis the fault, with the help of current estimated and speed estimated blocks. Fault tolerant algorithm was used for diagnosis current and speed sensor faults.Here, IFOC techniques is used to control the switches of the inverter and system performance is analysed. Estimated current control block is used to diagnosis  speed and  current sensor  which is estimated by logic based decision algorithm. In this paper modeling and simulation of three phase induction motor was deceloped using IFOC and fuzzy based new fault tolerant algorithm is also developed by using MATLAB/SIMULINK software

Embedded fuzzy controller for water level control

This article presents the design of a fuzzy controller embedded in a microcontroller aimed at implementing a low-cost, modular process control system. The fuzzy system's construction is based on a classical proportional and derivative controller, where inputs of error and its derivate depend on the difference between the desired setpoint and the actual level; the goal is to control the water level of coupled tanks. The process is oriented to control based on the knowledge that facilitates the adjustment of the output variable without complex mathematical modeling. In different response tests of the fuzzy controller, a maximum over-impulse greater than 8% or a steady-state error greater than 2.1% was not evidenced when varying the setpoint

DEVELOPMENT OF ALGORITHMIC MODELS FOR RESEARCH OF RELIABILITY PARAMETERS OF TROLLEYBUS TRACTION ELECTRIC MOTORS IN THE OPERATION PROCESS

The analysis of the reliability parameters of traction engines during the operation of trolleybuses in different modes is done. The presented groups of operational factors are lead to the emergence of censored samples. The methods of express analysis of engine reliability using technical diagnostic tools are determined. A block diagram of an algorithmic model for studying the reliability parameters of traction electric motors of trolleybuses during operation has been developed. It allows at any time to evaluate the influence of operational factors on the reliability indicators of traction electric engines and to more clearly and reasonably assign organizational, technical and preventive measures. It has been established that the effective and reliable operation of urban electric transport, in particular trolleybuses, depends on the reliability of individual components and assemblies of rolling stock, as well as on the quality and timely control of their parameters during operation. In practice, it has been proved that failure of traction electric motors (TEM) of trolleybuses leads to significant material losses at electric transport enterprises. And one of the main parameters of reliability of traction electric motors of trolleybuses is the reliability of operation during operation. Based on the research results, practical recommendations are developed on the rational choice of diagnostic parameters. Their implementation at electric transport enterprises will increase the reliability of traction electric motors as a whole up to 10 %. The developed methodology allows the study (assessment) of the reliability parameters of any type of traction engine of a trolley during operatio

Modeling, Analysis and Control of Hexagram Inverter for Three- Phase Induction Motor Drive

This paper presents the modeling, analysis and control of Hexagram inverter for three phase induction motor drive configuration. The Hexagram inverter can be used for both three phase and six phase applications. It has many advantages including reduced number of switches, modular structure leading to easy construction and maintenance, isolated dc buses. Besides, it has built-in fault redundancy due to the module interconnection. It has lowered dc energy storage requirement compared to that of cascaded H-bridge inverter. This eminent feature makes the system in high power applications. A simulation model of the Hexagram inverter fed three phase induction motor drive is developed in Matlab/Simulink environment. Simulation is carried out to study the drive performance at different operating conditions and the results are presented. Keywords: closed loop control, fault tolerant feature, hexagram inverter, three phase induction motor driv

Непряме полеорієнтоване керування двошнековим електромеханічним гідролізером

Goal. Development of a mathematical model of indirect field-oriented control of a twin-screw electromechanical hydrolyzer. Methodology. The paper presents a mathematical model of Indirect field-oriented control of twin-screw electromechanical hydrolyzer. The mathematical model was developed in the MATLAB / Simulink software environment. The determination of the main parameters of a twin-screw electromechanical hydrolyzer was carried out by developing a finite element model in the Comsol Multiphysics software environment. Results. Based on the results of a mathematical study, graphical dependences of the distribution of magnetic induction in the air gap of a ferromagnetic rotor, a spatial representation of the distribution of magnetic induction on a 3D model of a ferromagnetic rotor of a twin-screw electromechanical hydrolyzer were obtained. The results of finite element modeling were confirmed by a practical study of a mock-up of a ferromagnetic rotor of a twin-screw electromechanical hydrolyzer. By implementing the MATLAB / Simulink model, graphical dependences of the parameters of the ferromagnetic rotor of a twin-screw electromechanical hydrolyzer are obtained under the condition of a stepwise change in the torque and a cyclic change in the angular velocity. Originality. The paper presents an implementation of the method of indirect field-oriented control for controlling the ferromagnetic rotor of a twin-screw electromechanical hydrolyzer. The work takes into account the complex design of the ferromagnetic rotor of a twin-screw electromechanical hydrolyzer. Practical significance. The practical implementation of the results of mathematical modeling makes it possible to achieve effective control of a complex electromechanical system, allows further research to maintain the necessary parameters of the technological process and to develop more complex intelligent control systems in the future.У статті детально розглянуто конструктивні і електромагнітні особливості нестандартного електромеханічного перетворювача енергії – двошнекового електромеханічного гідролізера. Це технічний пристрій з поліфункціональними властивостями, здатний одночасно нагрівати, диспергувати, транспортувати, перемішувати та піддавати впливу магнітним полем в одному пристрої робочу сировину. Розроблено коло-польові та математичні моделі електромагнітних перехідних процесів цього пристрою. Основні параметри електромеханічної системи визначено шляхом кінцево-елементного моделювання та практичного дослідження феромагнітного ротора. В роботі представлено керування обертовим моментом та кутовою швидкістю феромагнітного ротора двошнекового електромеханічного гідролізера шляхом непрямого полеорієнтованого керування. Шляхом реалізації MATLAB / Simulink моделі отримано графічні залежності основних параметрів феромагнітного ротора за умов ступінчатої зміни обертового моменту та циклічної зміни кутової швидкості. За результатами моделювання помітно доцільність застосування методу непрямого керування з орієнтацією на поле для ефективного керування технологічним процесом двошнекового електромеханічного гідролізера. В порівнянні з розглянутими методами керування, непряме керування з орієнтацією на поле більш просте в проектуванні та реалізації, дозволяє досягнути бажаних характеристик та відкриває подальші можливості для дослідження двошнекового електромеханічного гідролізера