Download - Simulation of Switched Reluctance Motor Drives Using Two-Dimensional Bicubic Spline

studied. The measurement results discussed in this paper are obtainedon a four-pole 130 kVA synchronous machine.

Keywords: Parameter estimation, synchronous machines.Preprint Order Number: PE-164EC (04-2002)Discussion Deadline: September 2002

Improved Field Oriented Control of a LIMHaving Joints in Its Secondary Conductors

Gastli, A.

Author Affiliation: Sultan Qaboos UniversityAbstract: This paper presents a primary-flux-control algorithm

suitable for applications in short-primary long-secondary linear induc-tion motor drive systems. The advantage of the proposed control algo-rithm is that is more robust than the conventional vector controlalgorithm to the variation of the secondary resistance caused by the ef-fect ofjoint in the secondary conductors, which can be made of severalpieces of aluminum plates or rails joined together. The algorithm wastested by simulation on a sample of linear motor disk drive system. Thesimulation results were compared to those obtained by a conventionalvector control algorithm. Simulations and experiments have shown thatthe fluctuations of the thrust and attraction forces obtained with the pro-posed primary-flux control algorithm were significantly less than thoseobtained with the conventional vector control algorithm.

Keywords: Linear induction motor, joint effect, field orientation,primary flux control, vector control, simulation, LIM model.

Preprint Order Number: PE-236EC (04-2002)Discussion Deadline: September 2002

Simulation of Switched Reluctance MotorDrives Using Two-Dimensional Bicubic SplineXue, X.D.; Cheng, K.WE.; Ho, S.L.

Author Affiliation: Hong Kong Polyechnic UniversityAbstract: In this paper, a novel simulation algorithm of switched

reluctance motor drives is presented. With the proposed algorithm thetwo-dimensional bicubic spline interpolation is used to describe thenonlinear magnetic characteristics in switched reluctance motors. Thecorresponding computational method of two-dimensional bicubicspline function is described in detail. The simulation results are alsocompared with and validated by experimental data. Compared withconventional techniques, the presented simulation algorithm is moreaccurate even though it requires relatively little information on themagnetic characteristics of the motor.

Keywords: Simulation, bicubic spline, switched reluctance motordrives.


Magnetic Saturation Effects on the Controlof a Synchronous Reluctance Machine

Lubin, T.; Razik, H.; Rezzoug, A.

Author Affiliation: Universite Henri Poincare, FranceAbstract: Experimental results on the magnetic saturation effects

on the control of a small synchronous reluctance machine (600 W) arepresented in this paper. A new model of the machine, including satura-tion effects and cross magnetization, is first developed. An approachbased on total and mutual inductances is followed instead of the tradi-tional approach via magnetizing and leakage inductances. All the elec-trical and mechanical parameters measurement required for thesimulations are given. A rotor-oriented vector control of the synchro-nous reluctance machine is achieved with a DSP board (TMS320C31)and experimental results are presented. When the magnetic circuit issaturated, the simulation with the developed model shows a good accu-racy of the results when they are compared to the experimental ones.

Keywords: Synchronous reluctance machine, saturation, vectorcontrol.


Derating of Induction Motors Operating With aCombination of Unblanced Voltages and Over- orUnder-voltages

Pillay, P; Hofmann, P; Manyage, M.

Author Affiliation: Clarkson University, Potsdam, NY; Consoli-dated Edison of New York; University of Cape Town, South Africa

Abstract: This paper examines the proper application of inductionmachines when supplied by unbalanced voltages in the presence ofover- and undervoltages. Differences in the definition of voltage unbal-ance are also examined. The approach adopted is to use NEMA derat-ing for unbalanced voltages as a basis to include the effects ofundervoltages and overvoltages through motor loss calculations.


A Complete Lumped Equivalent Circuit ofThree-Phase Squirrel-Cage Induction Motors Usingthe Two-Dinensional Finite Elements Technique

Faiz, J.; Sharifian, M.B.B.; Feyzi, M.R.; Shaarbafi, K.

Author Affiliation: University of Tehran, Tehran, Iran; Universityof Tabriz, Tabriz, Iran

Abstract: This paper presents the use of the finite element tech-nique for determining the parameters of a three-phase squirrel-cage in-duction motor. The common parameters, in addition to the core lossesand ratio of number of tums, are obtained from the finite element fieldsolutions. The magnetizing characteristic and core losses curve areused to determine the flux distribution within the motor structure. Thelinear time harmonic vector potential field solution is utilized for the in-ductances computation. The accuracy of the finite element applicationis verified using the available precise results.

Keywords: Finite elements method, induction motor, equivalentcircuit.


Induction Generator Controller Based onthe Instantaneous Reactive Power TheoryLeidhold, R.; Garcia, G.; Valla, M.I.

Author Affiliation: University Nacional De Rio Cuarto, Cordoba,Argentina; UNLP

Abstract: A novel control strategy for a stand-alone inductiongenerator (IG), working with variable speed and load, is proposed. TheIG is simultaneously excited by a capacitor and an inverter. The capaci-tor provides the rated reactive current needed to excite the IG while theinverter adds the reactive current needed to regulate the IG output volt-age. The control strategy is based on the instantaneous reactive powertheory. A 4 kW laboratory prototype has been built to validate the pro-posal and experimental results are presented.

Keywords: ac generator excitation, induction generator,instantaneous reactive power theory.


Online Cage Rotor Fault DetectionUsing Air-Gap Torque Spectra

Thomas, W.; Vasudevan, K.; Kumar, VJ.

Author Affiliation: Indian Institute of Technology, Chennai, IndiaAbstract: This paper discusses use of air-gap torque spectra as a

means of identifying faults in cage rotors. Being dependent on bothstator and rotor currents, the torque is very sensitive to faults in the ro-

IEEE Power Engineering Review, July 2002 51