A Remote and Sensorless Stator Winding Temperature Estimation Method for Thermal Protection for Induction Motor

2014 ◽  
Vol 3 (3) ◽  
pp. 53-72 ◽  
Author(s):  
T. A. Enany ◽  
W. I. Wahba ◽  
M. A. Moustafa Hassan
Keyword(s):  
Thermal Behavior ◽  
Induction Motor ◽  
Induction Motors ◽  
Thermal Protection ◽  
Electrical Machine ◽  
Stator Winding ◽  
Temperature Estimation ◽  
Matlab Simulink ◽  
Soft Starter ◽  
Drive Signals

Three-phase induction motors are the “workhorses” of industry; they are the most widely used electrical machine; because of its simple structure and high reliability. This paper proposes a new technique to model the stator winding of the induction motor in Matlab Simulink® software. This simulation of the induction motor would have the thermal behavior of its stator winding; to study the induction motor temperature estimation using motor parameter-based method. The modified model is used to validate a remote and Sensorless stator winding temperature estimation technique; therefore a thermal protection is obtained for soft-starter-connected to induction motors. The soft-starter is used to inject a DC signal in the induction motor terminal voltage and current. The stator winding resistance/temperature is estimated from DC signal injection by changing the gate drive signals of the Thyristor in the soft starter. The level of the injected DC signal is adjusted by the value of the delay angle. The accuracy of stator winding temperature estimation increased with the increase of DC signal level; however the pulsation of the output torque increased also. The thermal behavior is simulated utilizing a thermal resistor block from the Matlab Simscape™ software. It is used to replace the fixed resistor value of the induction motor model in the Matlab Simulink. The thermal monitoring scheme has been validated from the simulation results of a 7.5 kW induction motor under various loading conditions.

scholarly journals Application of Genetic Algorithm for Inter-Turn Short Circuit Detection in Stator Winding of Induction Motor

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8523
Author(s):  
Marcin Tomczyk ◽  
Ryszard Mielnik ◽  
Anna Plichta ◽  
Iwona Gołdasz ◽  
Maciej Sułowicz
Keyword(s):  
Genetic Algorithm ◽  
Induction Motor ◽  
Diagnostic Method ◽  
Induction Motors ◽  
Short Circuit ◽  
Experimental Tests ◽  
Stator Winding ◽  
Short Circuits ◽  
Cage Induction Motor ◽  
Industry Conditions

This paper presents a new method of inter-turn short-circuit detection in cage induction motors. The method is based on experimental data recorded during load changes. Measured signals were analyzed using a genetic algorithm. This algorithm was next used in the diagnostics procedure. The correctness of fault detection was verified during experimental tests for various configurations of inter-turn short-circuits. The tests were run for several relevant diagnostic signals that contain symptoms of faults in an examined cage induction motor. The proposed algorithm of inter-turn short-circuit detection for various levels of winding damage and for various loads of the examined motor allows one to state the usefulness of this diagnostic method in normal industry conditions of motor exploitation.

Defining a New Era for Induction Motors

2021 ◽  
Author(s):  
Katherine Escobar ◽  
Maxim Radov ◽  
Cristina Vasilache
Keyword(s):  
Power Consumption ◽  
Induction Motor ◽  
Laboratory Testing ◽  
High Performance ◽  
Induction Motors ◽  
Simulated Data ◽  
Field Trials ◽  
Electrical Performance ◽  
Electrical Machine ◽  
New Era

Abstract Induction motors have been widely used in the ESP industry for decades. Motor operation, control, and optimization are well-understood topics among providers and final consumers, who strive to get the most efficient electrical machine in the well to reduce power consumption and, consequently, operating expenses. This paper presents a case study for a newly redesigned induction motor and changes made in its design and construction. A field trial of two wells deployed with the new motor and a comparison with a well deployed with the standard motor are described. Field and simulated data are used to analyze the electrical performance and power consumption. The test results included are from wells in the US Rocky Mountains. Additionally, some of the motors in this test were manufactured with a high-performance thermally conductive and electrically insulative windings encapsulation, which is further discussed in the paper. The increased efficiency was achieved through an optimized electromagnetic design that helped to reduce the motor total losses. Efficiency gains were measured against standard motor design through laboratory testing, and the result showed 2.2 to 2.5% higher efficiency for the newly developed motor. With the higher power density, the motor length was shortened from 20 to 25% during the field trials, reducing the total length of the string. In addition to the optimization of motor length, the newly redesigned motor generates a lower core temperature when compared to a previous motor of the same length and subjected to the same load. This fact allows the motor to be loaded up to 25% above its nameplate rating, improving the horsepower rating and opening a new era for highly flexible induction motors. The gathered results showed that the newly redesigned motor provides higher efficiency and lower total electrical power consumption compared to the standard induction motor that would have been used in those applications. Both results were evidenced in controlled laboratory testing and field trials. A further comparison of similar ESP equipment configuration running with former motor versions is also provided, as well as design comparison cases between the expected results of the previous and the newly designed motor.

Thermal analysis and efficiency of an induction motor driven by a fault-tolerant multilevel inverter using FEM

2015 ◽  
Vol 34 (2) ◽  
pp. 573-589 ◽  
Author(s):  
Bruno R. O. Baptista ◽  
André M.S. Mendes ◽  
Sérgio M.A. Cruz
Keyword(s):  
Control System ◽  
Thermal Behavior ◽  
Induction Motor ◽  
Motor Behavior ◽  
Fault Tolerant ◽  
Experimental Tests ◽  
Open Circuit ◽  
Matlab Simulink ◽  
Content Type ◽  
Three Phase

Purpose – The purpose of this paper is to present a comparative study of the thermal behavior and efficiency of an induction motor fed by a fault-tolerant Three-Level Neutral Point Clamped (3LNPC) inverter, under normal conditions as well as after a post-fault reconfiguration, following an open-circuit fault in the inverter. For this purpose, a Matlab/Simulink model and three-phase induction motor models using a finite element method (FEM) software were developed. Besides, some experimental tests were conducted for different values of the induction motor load torque and speed reference to validate the models. Design/methodology/approach – To assess the thermal behavior and efficiency of the motor, electromagnetic and thermal models using a FEM software were developed. The coupling with the inverter drive is accomplished through a developed model in Matlab/Simulink which also includes the control system. The simulation tests were performed for a healthy and faulty inverter at different operating points of the three-phase induction motor. To validate the FEM models some experimental tests were performed. Findings – When the inverter operates in reconfigured mode the motor losses are higher and consequently temperature is higher and the motor efficiency is lower. The developed models are an alternative to a more detailed study of the motor when fed by a 3LNPC inverter and consequent optimization of the control system. Originality/value – With the developed tools, a better understanding of the motor behavior and performance is gained, allowing to forecast scenarios and optimize fault-tolerant control strategies for the drive.

Modelling of a 3-Phase Induction Motor Under Open-Phase Fault Using Matlab/Simulink

2016 ◽  
Vol 7 (4) ◽  
pp. 1146
Author(s):  
Mohammad Jannati ◽  
Tole Sutikno
Keyword(s):  
Induction Motor ◽  
Efficient Method ◽  
Induction Motors ◽  
Induction Machines ◽  
Matlab Simulink ◽  
Open Phase ◽  
Q Model

The d-q model of Induction Motors (IMs) has been effectively used as an efficient method to analyze the performance of the induction machines. This study presents a step by step Matlab/Simulink implementation of a star-connected 3-phase IM under open-phase fault (faulty 3-phase IM) using d-q model. The presented technique in this paper can be simply implemented in one block and can be made available for control purposes. The simulated results provide to show the behavior of the star-connected 3-phase IM under open-phase fault condition.

scholarly journals Determining an additional diagnostic parameter for improving the accuracy of assessment of the condition of stator windings in an induction motor

2021 ◽  
Vol 5 (5 (113)) ◽  
pp. 21-29
Author(s):  
Oleg Gubarevych ◽  
Sergey Goolak ◽  
Olena Daki ◽  
Yuriy Yakusevych
Keyword(s):  
Induction Motor ◽  
Induction Motors ◽  
Short Circuit ◽  
Rotation Frequency ◽  
Additional Parameter ◽  
Stator Winding ◽  
Diagnostic Parameter ◽  
Stator Windings ◽  
Shaft Rotation ◽  
Additional Diagnostic Parameter

This paper has proposed and substantiated the application of an additional diagnostic parameter for assessing the state of stator windings of induction motors during operation. The dependences of the values of phase shifts between phase currents and phase voltages have been obtained. These dependences showed that when an inter-turn short circuit occurs in the stator windings, the phase shifts are the same for all phases of the motor. That has made it possible to obtain the dependence of the change in phase shift on the change in the engine shaft rotation frequency. This study's result has established the dependence of the rates of change of the phase angle on the engine shaft rotation frequency for both one and two damaged phases with varying degrees of damage. When analyzing these dependences, it was found that with an increase in the number of damaged phases of the electric motor, the linear section of the dependences decreases. In addition, with an increase in the degree of phase damage, the angle of inclination of the linear sections of the characteristics decreases. That has made it possible to determine an additional parameter for diagnosing the place and degree of an inter-turn short circuit of the windings in an induction motor with a squirrel-cage rotor. The values of the additional parameter, termed by this paper's authors as a "phase criterion" can be used to assess the condition and degree of damage to the stator winding of induction motors. The values of the phase criteria for various types of damage were: when phase A is damaged by 90 %, ξ=0.634, (deg)2/(rpm)2; when phase A is damaged by 80 %, ξ=0.393, (deg)2/(rpm)2; when phase A is damaged by 80 % and phase B is damaged by 90 %, ξ=0.25, (deg)2/(rpm)2; when phase A is damaged by 80 % and phase B is damaged by 90 %, ξ=0.173, (deg)2/(rpm)2. The results of this research could be used to select an effective method for diagnosing an inter-turn short circuit in the stator winding when building a diagnostic system for induction motors as part of drives of transport equipment

Simulation of Voltage on Stator Winding Terminals of Induction Motor with Impaired Short-Circuit Winding of Rotor

2015 ◽  
Vol 792 ◽  
pp. 155-159
Author(s):  
Alexander Novozhilov ◽  
Alexandra Potapenko
Keyword(s):  
Induction Motor ◽  
Induction Motors ◽  
Short Circuit ◽  
Stator Winding

The paper is presented the method of simulation of voltage on the stator winding terminals of induction motor with impaired short-circuit winding of rotor in the running-out mode. This method allows to simulate processes in induction motors with precision to satisfy the requirements of protection equipment.

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