PWM Inverter-fed Induction Motor Research Articles

Design Consideration for IGBT-Based PWM Inverter-Fed Induction Motors

Design Consideration for IGBT-Based PWM Inverter-Fed Induction Motors by Joel Ogunyemi * , Olawale Ezekiel Fagbuaro, Henry Sunday Okeke Department of Electrical and Electronics Engineering, The Federal Polytechnic Ilaro,112106, Nigeria * Author to whom correspondence should be addressed. Journal of Engineering Research and Sciences, Volume 1, Issue 12, Page # 21-27, 2022; DOI: 10.55708/js0112004 Keywords:

Generalized Likelihood Ratio Test Based Approach for Stator-Fault Detection in a PWM Inverter-Fed Induction Motor Drive

This paper proposes a new approach for the detection of stator faults in inverter-fed induction motor under closed-loop control. These faults, generally, start with interturn short circuit and can evolve to phase-to-phase or phase-to-ground faults, leading to stator currents unbalance. In the considered application, the stator windings are supplied by a static converter for the control of the speed and the rotor flux of the motor. The unbalance fault has been artificially created through additional resistance in series with one phase of the stator windings. The proposed diagnosis approach is based on the computation of the symmetrical components of the stator currents. The supply fundamental frequency and the three-phase phasors are estimated based on the maximum likelihood estimator. Then, the generalized likelihood ratio test is applied for unbalance fault detection. Simulation and experimental results on a 1.5-kW induction motor illustrate the effectiveness of the proposed approach, leading to an effective diagnosis procedure for stator faults in inverter-fed induction motor under steady state and closed-loop operation.

Bearing Fault Diagnosis of a PWM Inverter Fed-Induction Motor Using an Improved Short Time Fourier Transform

Induction motor diagnosis using the Power Spectral Density (PSD) estimation based on the Fourier Transform calculation has been widely used as an analysis method for its simplicity and low computation time. However, the use of PSD is not recommended for processing non stationary signals (case of variable speed applications) and therefore the analysis with PSD is not reliable. To overcome this handicap, the Short Time Fourier Transform (STFT) is proposed in this paper; giving additional information on changes of the frequencies over time for stator current signal analysis. Furthermore, the use of a new approach called Maxima’s Location Algorithm is also proposed. This later will be associated with the STFT analysis to show only those harmonics with useful information on existing faults. This approach will be used in the diagnosis of bearing faults of a PWM inverter-fed induction motor operating at variable speed. Several experimental results in the transient state are carried out firstly to validate the results and secondly to illustrate the merits and effectiveness of the combined STFT/MLA proposed approach.

Bearing Fault Detection in PWM Inverter Fed Induction Motor Drives by Transformative Techniques

Bearing Fault Detection in PWM Inverter Fed Induction Motor Drives by Transformative Techniques

Modelling and Detection of Bearing Fault in PWM Inverter Fed Induction Motor Drives

Modelling and Detection of Bearing Fault in PWM Inverter Fed Induction Motor Drives

A Fuzzy Based Approach for PWM Inverter fed Induction Motor V/f speed control

Induction motors are the most widely used for appliances, industrial control, and automation; however, many applications need variable speed operations. The rapid development of power electronics controllers in recent years has attracted the attention of researchers for making use of flexible characteristics of an induction motor in variable frequency drives. It presents a compact embedded fuzzy system for three-phase induction motor scalar speed control. The control strategy consists of keeping constant the voltage frequency ratio of the induction motor supply source

Analysis by Simulation of the Over-voltages in PWM-Inverter Fed Induction Motors

The aim and content of the present work consists of the over voltages at induction motor terminal, the voltage distribution in the stator winding of induction motor confronted by fast rising voltage, the primary objective of this research work is to develop a simulation model of PWM Inverter, cable and induction model in MATLAB or EMTP software. The system model is used to identify the over voltages as well as the distribution and magnitude of fast rising (steep fronted) voltage in the stator winding of electrical machines fed from PWM inverters. Voltage reflection analysis analyzed at the motor terminal considering different cable length between motor and inverter as well as rise time. 

Comparison of MRAS Based Rotor Resistance Estimator Using Reactive Power and Flux Based Techniques for Space Vector PWM Inverter Fed Induction Motor Drives

The performance of Vector Controlled Induction Motor drive depends on the accuracy of rotor resistance which will vary with temperature and frequency. The MRAS approach using reactive power and flux as a state variable for rotor resistance estimation makes MRAS computationally simpler and easy to design. In this paper, Rotor Flux based MRAS (RF-MRAS) and Reactive Power based MRAS (RP-MRAS) for rotor resistance estimation is designed and validated through MATLAB simulation. The performance of these two methods are analyzed extensively and compared in terms of accuracy and settling time. The suitable method for rotor resistance estimation for Space Vector PWM Inverter fed induction motor drive is identified. The promising obtained results are presented.

Eighteen-sector switching strategy for torque ripple reduction of direct torque controlled induction motor drive

Direct torque control (DTC) is an emerging technique for controlling the PWM inverter-fed induction motor drives (IMDs). The low number of voltage vectors, which can be applied to the machine using the basic DTC scheme, may cause undesired torque and current ripple. This paper proposes DTC 18-sector switching strategy, where the d-q flux locus plane is divided into 18 equal sectors, which lead to an increase in the number of voltage vector. Here a modified switching table has been derived on the basis of the optimised state selection of voltage vector. The proposed scheme is simple as it does not increase the complexity in the vector selection process and is less parameters sensitive. The performance of the proposed and conventional DTC schemes has been checked at low speed in order to demonstrate the torque ripple reduction. To verify the feasibility of the proposed scheme, computer simulations and an experimental test has been carried out to validate the results of the proposed method.

자계가속법에 의한 유도 전동기의 전력회생 구동

This paper presents a solution that an analytical model for an induction motor and the formula of regenerative power and instantaneous torque are derived. based on the spiral vector. The torque is controlled linearly through variations of the slip angular velocity, based on the field acceleration method (FAM). And also PWM inverter fed induction motor drives is schemed to be easily a regenerative drive. The voltage source inverter fed induction motor drives that regenerative power occurs with back current type is presented, to easily controlled the feedback power and to proper the adaption of energy shaving drives. The experimental tests verify the performance of the FAM, proving that food behavior of the drive is achieved in the transient and steady state operating condition, and are discussed to save the power that regenerative power is measured at the operating acceleration or deceleration of servo system.

Improved direct torque and flux vector control of PWM inverter-fed induction motor drives

In this paper, a direct torque and stator flux vector control system is presented. The principle of this method was proposed by Takahashi and Noguchi in 1985. In contrast to the field oriented control, no coordinate transformation and current control loop is required. In practical application, however, problems occur with starting and operation in the zero speed region. This paper shows how, by introducing an additional carrier signal to the torque controller input, a robust start and improved operation in the low speed region can be achieved. The simulation and experimental results which illustrate the performances of the proposed system are presented. Also, nomograms for controller design are given. >

Application considerations for PWM inverter-fed low-voltage induction motors

PWM inverter-fed induction motor drives are being used in greater numbers throughout a wide variety of industrial and commercial applications. PWM inverters provide many benefits to their users including improved control of processes, reduced energy consumption, and expanded diagnostics. Despite these benefits, PWM inverters should be applied with special consideration for low-voltage induction motor operation. The power supplied to the motor by a PWM inverter has some adverse effects which this paper describes. These effects include increased heating, high peak voltages, and increased audible noise. Many manufacturers of PWM inverters promote to the marketplace that their PWM inverters can successfully operate any low-voltage induction motor. This is often not true. There are many PWM inverter-motor applications which require long periods of low speed operation, wide constant torque speed range, and high starting torque, all of which could cause the motor additional stress resulting in a possible unsuccessful application. The intent of this paper is to highlight some of the known possible adverse effects PWM inverters cause low voltage induction motors and the impact these effects have on the given application. This paper is written for those that are applying PWM inverter-fed low voltage induction motors, not those designing them.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

An Application of Model Following Servo (MFS) Control to Vector Controlled INduction Motor Drive System

By using the vector control strategy, PWM inverter-fed induction motor drive system is used in various fields. In this case, a conventional PI speed control is widely used as the major feedback loop. In this paper, the application of model following servo (MFS) control to the vector controlled induction motor drive system is studied to achieve superior performance compared with the PI controller.At first, by assuming ideal vector control, a MFS controller is designed to minimize a specified performance index. Secondly, in order to study the influence of machine parameter change, a linear model is derived by using a small displacement theory. Finally, the computed and the experimental results are discussed from the viewpoints of the trajectories of poles and zeros, and the transient responses. As the result of the analysis, the pole of induction motor is close to the zero by choosing the large value of the weighting constant in spite of the change of rotor resistance. And the superiority of the MFS control as compared with the PI control is maintained when the rotor resistance is changed.

An application of model following servo (MFS) control to vector controlled induction motor drive system

By using the vector control strategy, PWM inverter-fed induction motor drive system is used in various fields. In this case, a conventional PI speed control is widely used as the major feedback loop. In this paper, the application of model following servo (MFS) control to the vector controlled induction motor drive system is studied to achieve superior performance compared with the PI controller.At first, by assuming ideal vector control, a MFS controller is designed to minimize a specified performance index. Secondly, in order to study the influence of machine parameter change, a linear model is derived by using a small displacement theory. Finally, the computed and the experimental results are discussed from the viewpoints of the trajectories of poles and zeros, and the transient responses. As the result of the analysis, the pole of induction motor is close to the zero by choosing the large value of the weighting constant in spite of the change of rotor resistance. And the superiority of the MFS control as compared with the PI control is maintained when the rotor resistance is changed.

Waveform Distortion and Correction Circuit for PWM Inverters with Switching Lag-Times

The switching lag-time that prevents the phase shortage of inverter arms causes serious waveform distortions and fundamental voltage drops in pulsewidth-modulated inverter output. Distortions in the PWM inverter-fed induction motor system over the various frequencies of the carrier are investigated and a correction circuit with PWM potential feedback is proposed; the effectiveness of that circuit is shown by experiments.

電圧形ＰＷＭインバータによる誘導電動機駆動系の安定性解析

電圧形ＰＷＭインバータによる誘導電動機駆動系の安定性解析

ＰＷＭインバータで駆動される誘導電動機の安定性について

ＰＷＭインバータで駆動される誘導電動機の安定性について

Stability of PWM inverter fed induction motor

Stability of PWM inverter fed induction motor