EPE Journal Volume 11-3 
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EPE Journal Volume 11-3 - Editorial
EPE Journal Volume 11-3 - Papers



 EPE Journal Volume 11-3 - Editorial 

A. Meeting of Friends  [Details]
By B. Sneyers

The Editorial of the EPE Journal Volume 11 N3, "A Meeting of Friends", written by Ir. Brigitte Sneyers, the Secretary General of EPE Association.


 EPE Journal Volume 11-3 - Papers 

Digital Signal Processor Based Sensorless Speed Control of a Permanent Magnet Synchronous Motor Drive Using Extended Kalman Filter
By M. Boussak

In this paper, a new approach to a sensorless speed control and an initial rotor position estimation for a salient pole Permanent Magnet Synchronous Motor (PMSM) drive is presented. At a rotating consition, speed and rotor position estimation of PMSM drive are obtained through an Extended Kalman Filter (EKF) algorithm by only measuring the phase voltages and motor currents. The main difficulty in developing an EKF for a salient pole PMSM is caused by the complexity of the dynamic model expressed in the stationary coordinate system. This model is more complicated than that of the surface PMSM, resulting from the assymetry of the magnetic circuit. The starting procedure is a problem under sensorless drives, because no information is available before starting. The initial rotor position is estimated by the current response of the voltage pulse, which is intermittently applied to the motor at standstill. To illustrate our work, we present experimental results for a salient pole PMSM obtained on a floating-point Digital Signal Processor (DSP) TMS320C31/40 MHz based control system.

Graphical and Algebraic Synthesis for PWM Methods  [Details]
By S. L. Capitaneanu; B. de Fornel; M. Fadel; J. Faucher; A. Almeida

The article proposes an algebraic synthesis for PWM methods, which is based on a graphical representation of the 2 levels VSI (Voltage Source Inverter). This theory can be the starting point for every PWM method representation. In order to understand the historical evolution of the PWM methods the authors propose two classification groups of the main PWM techniques. The main classification is based on the movement of the neutral point (zero-voltage VN0 evolution). The details of PWM methods presented here are also seen from the graphical representation perspective. The equivalence between the well-known SVM (Space Vector Modulation) practically DDT realized (Direct Digital Technique) and the three-phase PWM with a carrier based industrial realization is shown. The principles of the threephase PWM and the 3rd harmonic injection PWM (THIPWM4, THIPWM6) are compared the same as the DPWM (Discontinuous PWM) methods. These classifications and equivalences between different techniques show that the number of contemporary used PWM principles can be reduced. The general complex space representation and the classifications proposed here are simple to comprehension educational tools and they simply the way towards practical implementation.

Sliding Mode Observer Scheme for Induction Motor Control  [Details]
By M. Rodic; A. Sabanovic; K. Jezernik

A novel approach to the speed sensorless torque and flux tracking slide mode control of induction motor is presented in the paper. The main contribution of the paper is a new structure of induction machine rotor flux observer aimed for the sensorless operation. Proposed approach addresses the problem sensorless induction machine servo-drive at both, low and high speed, where rapid speed changes can occur. The idea is realized by introducing a non-linear stator frequency dependant gain in the rotor flux observer and thus enabling the operation at low and high speeds. The adaptation algorithm for stator resistance is included. Observer is robust to the parameter uncertainties, especially to rotor resistance. The performance is investigated and verified with simulations and experiments.

Generator Operation of Switched Reluctance Machine Drives for Electric Vehicles  [Details]
By R. B. Inderka; M. Menne; R. W. De Doncker

This contribution deals with the stringent control requirements of switched reluctance generators for electric vehicle (EV) applications. In EV aplications, switched reluctance machines have to operate in generating mode over a wide torque-speed range, i.e. in the current controlled chopping mode at low speed as well as in the voltage controlled single-pulse operation at high speed. In addition, the d.c.-bus voltage varies with the load as a function of the energy source. This voltage variation requires continuous variable adaptation when a wide speed range is required. Furthermore, a novel control strategy to implement a three-level hysteresis current regulator for generating mode is presented. This technique improves drive efficiency up to 8% over a wide operating area. In addition, the problem of uncontrollable overcurrents due to excessive back-EMF voltage during generating mode is discussed. Therefore, the variables, which are necessary to control the switched reluctance drive, and the resulting efficiency characteristics are presented.

Design Considerations for a Tabular Linear PM Servo Motor  [Details]
By N. Bianchi; S. Bolognani; F. Tonel

The design criteria of a tubular linear PM motor, with surface-mounted permanent magnets, are described in this paper. At first, the basic equations for analyzing the motor are derived, considering both slotted and slotless topologies. These equations are rearranged giving useful hints for the motor design. A finite element analysis is used to validate the results obtained from the analytical model. A good agreement is obtained comparing hte magnetic field quantities as well as the mechanical forces. For servo drives the external dimensions are generally fixed, then the motor design is achieved with this constraint. The effect of the PM quality is considered, comparing motor designs with ferrite and Nd-Fe-B magnets.