Silviano Rafael

Obtaining the magnetic characteristics of an 8/6 switched reluctance machine: from FEM analysis to the experimental tests

This paper describes the procedure for modeling an 8/6 switched reluctance machine (SRM) step-by-step. First, the geometry and mechanical parameters of the machine are established, when a finite-element modeling (FEM) approach is initially developed to obtain the flux linkage/current/rotor position relationship so that the proper and mutual inductances and also its torque and field distribution characteristics can then be computed. Afterward, a series of experimental tests are performed to obtain the magnetic characteristics of the machine, comparing, correcting, and discussing the results with those of FEM analysis.

Obtaining the magnetic characteristics of an 8/6-switched reluctance machine: FEM analysis and experimental tests

This paper describes the step-by-step procedure for modeling an 8/6 switched reluctance machine. Starting from establishing the geometry of the machine, a finite element modeling approach is initially developed to compute the flux linkage/current/rotor position relationship extracting proper and mutual inductances, also its torque and field distribution characteristics. Experimental tests are performed to obtain the magnetic characteristics of the machine, comparing, correcting, and discussing the results obtained with those of FEM analysis.

Design and Implementation of a Reconfigurable Remote Laboratory, Using Oscilloscope/PLC Network for WWW Access

The objective of this paper is to present a remote laboratory in the context of power electronics education. New technologies and developments are compelling educators to deeply reflect on the traditional means of teaching. Modern curricula require new ways of conception and implementation of innovative pedagogical approaches. Often, these new pedagogical approaches require novel technological realizations. Although e-learning facilities are increasingly being used in engineering education, often, they are based on simulations and/or emulations of virtual laboratories. This paper presents a remote laboratory facility that allows the students to conduct real power electronics reconfigurable experiments through the Internet, promoting a more efficient learning through online industrial automation operation using the Internet and WWW services.

PLC controlled industrial processes on-line simulator

The practical tryout of a PLC controlled automation process is a well known problem. This paper presents a process simulation tool, developed under the windows operating system, which can be used with any type of programmable logic controller. The process editor is comprehensive and is easy to use. An inexpensive hardware interface is established between the serial port of a personal computer and the digital and analog inputs/outputs of the PLC.

Flux-linkage characteristics models for Switched Reluctance Machines

This paper discusses how the magnetic characteristics of Switched Reluctance Machines (SRMs) are obtained by experimental, analytic and FEM modelling. Two analytical approaches are used to determine the Flux-linkage characteristic of Switched Reluctance Machines considering simple geometry aspects. The proposed methods are derived from a regular SRM magnetic characteristic obtained by experimental tests and validated by FEM. In order to reduce calculation time and expense, regarding simulation and implementation proposes, these analytical functions approaches require only few parameters, normally available or easily measured. The developed model of the first approach is presented and the second approach concepts are illustrated with a 6/4 SRM flux-linkage characteristic.

Position control of an 8/6 switched reluctance machine without current sensor

The electrical motion drives are more and more used in various industrial processes. The choice of the motor drive is based on power, speed, precision, and cost requirements. There are many different types of motors for motion drives application. AC and DC motors feature brushed or brushless designs are suitable for a variety of industrial applications. Speed, torque and position control are the most used motion control systems. There are many papers about switched reluctance motor speed control and torque control but few about position control. This paper pretends to contribute for the potentiality of the switched reluctance motor in position application. In the first part it is presented the theoretical concepts for motor shaft position. The second part presents a prototype implementation and experimental results when intermediate position between two poles position alignment are reached.

Study and Analysis of the Switched Reluctance Machine Shaft Position

The switched reluctance machine (SRM) was, during the last decade, target of the attention of researchers. Some studies stand out the application potentialities of the machine, anothers developed the machine design for better performance in terms of efficiency, good torque and speed behavior. Others denote the possibility of good machine functioning without the position sensor and there are still others presenting a way to reduce the noise produced in dynamic regimen. However, there are very few works about the analysis of the machine behavior regarding its shaft position. This work presents some results in this thematic, studying and analyzing its geometry and torque values necessary to develop when a shaft position is intended. Some methodologies are presented in order to be applied to obtain a shaft position. One of them is based on experimental results taking into account the two phases that are necessary to excite simultaneously in order to produce the immobilization of the motor shaft in one determined position.

Magnetic characteristics modelling for regular Switched Reluctance Machines: Analytical and FEM approaches

In this paper, an analytical approach is used to determine the Flux-linkage characteristic of regular Switched Reluctance Machines (SRMs) considering simple geometry aspects. The proposed method is derived from an 8/6 SRM magnetic characteristic obtained by experimental tests and validated by FEM results. In order to reduce calculation time and expense, regarding simulation and implementation proposes, this analytical functions approach requires only few parameters, normally available or easily measured. An application example for a 6/4 SRM is presented to illustrate its use.

Performance of a Four Phase Switched Reluctance Motor Speed Control Based On an Adaptive Fuzzy System: Experimental Tests,Analysis and Conclusions

In this paper, the controller’s tuning and performance of a speed controller prototype for switched reluctance motor is presented using significant experimental tests. The system uses an on-line learning mechanism to acquire and modify, if needed, the “good” fuzzy control rules. Experimental essays are analyzed and discussed in order to reveal some advantages of having a learning speed controller for the SR machine, and also the drawbacks that the use of using these controllers can introduce to the drive system and possible ways to overcome them.

A study and design of a position tracking control for an 8/6 switched reluctance machine

This paper presents a position tracking control for a switched reluctance motor (SRM) in servomotor operation. The sliding mode control provides attractive features such as fast response and relative insensitivity to the variations in the plant parameter. In this work an application of a sliding mode position control based on the reaching law control (RLC) approach is discussed. The controller was tested and evaluated on a SRM servomotor. The controller and the command are installed on a digital signal controller. The experimental results of the SRM dynamics response in position tracking control are presented to demonstrate the effectiveness of this low cost control system.