SESSION PO1: POSTER SESSION

Wednesday, September 2 10:00 - 12:15

SYNCHRONOUS MACHINES

Analysis and Calculation on End Structure and Magnetic Field of Salient-Pole Rotor Electric Generator for Impulse Test	9
T. Min, F. Ziqing, China

Circulating Currents within Small Synchronous Generators	14
D.G. Dorrell, UK

High Speed Machines on Magnetic Bearings - Design Concepts and Power Limits	20
W.-R. Canders, Germany

The Saturation of Leakage Reactances in a Salient-Pole Synchronous Machine	26
S. Salvador, Portugal, L. Pierrat, France, J. Esteves, M.S. Garrido, J. Santana, Portugal

Modal Analysis and Damping of Subsynchronous Oscillations	30
J.V. Milanovic, UK, M.C.A. Koh, Singapore

Variation in Damping and Frequency of Torsional Modes Caused by Uncertainty in Shaft Mechanical Parameters	36
J.V. Milanovic, UK, C.P.N. Fu, Australia

Analysis of Synchronous Machines Connected to Unbalanced Network	42
J. Tamura, M. Kubo, Y. Tomaki, T. Nagano, Japan

Saturation Effect on the Simulation of the Synchronous Machine-Power Electronic Converter Set	48
M.F. Benkhoris, S. Lasquellec, M. Feliachi, R. Le Doeuff, France

A Method of Searching for the Best Model of a Synchronous Machine, Allowing for Unequal Mutual Inductances	54
W. Jazdzynski, Poland

Effects of Generator Shaft Torsionals on Control of Large Units with Non-linear Valve Stroking Following Severe Supply System Disturbances	59
T.J. Hammons, UK

A Fuzzy Logic Controlled Static Phase Shifter for Bus Voltage Regulation of Interconnected Power Systems	66
Ý.H. Altaþ, Turkey

Effects of Synchronous Machine Circuit Parameters on Steady State Stability	72
N.C. Kar, J. Tamura, Japan

Improvements in Automatic Control of Synchronous Machine with Machine Commutated Current Inverter	78
A.N. Novakovsky, P.A. Tikotsky, Yu.D. Vinitski, A.M. Weinger, Russia

Salient Pole Synchronous Motor Excitation and Stability Control in Direct Torque Control Drives	83
O. Pyrhönen, J. Kaukonen, M. Niemela, J. Pyrhönen, J. Luukko, Finland

Voltage Source Converter-Fed Synchronous Motor Drive	89
I. Schmidt, K. Veszpremi, Hungary

Performance of Small and Medium Power Flux Barrier Rotor Reluctance Synchronous Machine Drives	95
X.B. Bomela, S.K. Jackson, M.J. Kamper, South Africa

Forced Excitation of Pulse Generators with Sequential Switching of the Windings	100
A.V. Loos, G.A. Sipailov, A.I. Chuchalin, Russia

Straight Flow Microhydro Power Station and Its Experimental Investigation	103
J. Danilevich, Russia

The Gas Penetration into the Water Cooling Circuit of a Generator	106
Z. Jelinek, Czech Republic

SWITCHED RELUCTANCE MACHINES

Field Analysis and Dynamic Model of a Doubly-Salient Permanent-Magnet Motor	110
C. Martis, M.M. Radulescu, K. Biro, Romania

Reduction of Switched Reluctance Machine Vibrations. Control Actuation	114
M. Gabsi, F. Camus, B. Humeau, M. Besbes, France

Analysis and Control of a Reluctance Motor Having a Toroïdal Magnetic Circuit	119
J.-C. Vannier, P. Vidal, C. Poirson, France

A Fuzzy Tracking Current Controller for Torque Ripple Optimization of Switched Reluctance Motors	125
E. Bassily, M. Hallouda, Egypt

A Fuzzy Logic Approach to Current Control of Switched Reluctance Motors	131
H. Henao, G.A. Capolino, M. Poloujadoff, France

Sensorless SRM Drives Using ANN-Based Estimators	137
A. Bellini, G. Filippetti, F. Franceschini, C. Tassoni, Italy, P. Vas, UK

Sensorless 12/8 Switched Reluctance Drives for Low Power and Low Voltage Applications	143
P. Andrada, F. Castellana, E. Martinez, J.I. Perat, Spain

LOSSES

Losses in Non-Linear Moving Bodies	147
G. Preda, F.I. Hantila, M. Vasiliu, E. Demeter, Romania

Power Losses in Dynamo Sheet During Axial Magnetization with Flux Evoked by PWM Voltage Supply	153
K. Zakrzewski, Poland

Indirect Method of Measuring Additional Load Losses in Induction Motors	159
M.M. Kostic, Yugoslavia

Evaluation of the Iron-Loss in Highly Saturated Electrical Machines	165
B. Amin, France

Iron Loss in Vector Controlled Induction Machine	169
S. Moulahoum, O. Touhami, M. Benhaddadi, Algeria

Losses in PWM Converter-Fed Three Phase Induction Motors and Their Percentages	175
H. Röhrdanz, Germany

Loss Reduction in Synchronous Machines by Appropriate Feeding Patterns	181
H. May, W.-R. Canders, R. Palka, Germany

Magnetic and Thermal Analysis of a Wound-Field Cylindrical Rotor Synchronous Motor in Optimal Efficiency Operation	187
C. Mademlis, J. Xypteras, N. Margaris, Greece

SESSION IM1: INDUCTION MACHINES

Wednesday, September 2 10:45 - 12:15
Chair: Prof. Dr. B. J. Chalmers

High Harmonic Fundamental Current Modulation Caused by Zig-Zag Leakage Flux Pulsation	193
W. Deleroi, The Netherlands

Thermal Evaluation of New Housing of Electrical Machine	200
B. Hribernik, M. Trlep, A. Hamler, Slovenia, E.C. Protas, Austria,

Optimised Design of a Double Cage Induction Motor by Fuzzy Artificial Experience and Finite Element Analysis	203
N. Bianchi, S. Bolognani, M. Zigliotto, Italy

Estimation of Rotor Slot Harmonic Amplitudes and Frequencies in the Line Current of Induction Motors	209
H. Güldemir, K.J. Bradley, UK

Simulation Study of a Double Three Phase Electric Machine	215
Z. Chen, A.C. Williamson, UK

A Dynamic Performance Booster for Current Regulated Induction Machines at High Speed Utilizing Trapped Rotor Flux	221
R.S. Wieser, Austria

SESSION TS: TESTING

Wednesday, September 2 10:45 - 12:15
Chair: Prof. Dr. A. Krawczyk

Testing of Inverter Fed Electrical Machines: Instrumentation and Procedure Problems	227
A. Boglietti, M. Pastorelli, A. Carullo, M. Parvis, Italy

Some New Aspects of the Digital Two-Speed Method for Assessing Transient Torques of AC Motors and Choice of an Optimal Algorithm for Filtering the Measured Data	233
R. Radosavljevic, D. Kalic, Z. Lazarevic, Z. Radakovic, Yugoslavia

Ratings and Parameters of Induction Motor Equivalent Schemes	239
N. Galan, G. Ciumbulea, S. Deleanu, Romania

Numerical and Experimental Determination of an Induction Machine Parameters Depending on the Magnetising Current	243
G. Garcia Soto, A. Yahiaoui, E. Mendes, F. Bouillault, France

Thermal Testing for Inverter-Fed Induction Machines Using Mixed Frequency Method	248
L. Tutelea, I. Boldea, Romania, E. Ritchie, P. Sandholdt, F. Blaabjerg, Denmark

Standstill Frequency Response Testing and Simulation of Large Hydrogenerators at the Macagua II Project	254
S. Salon, USA, C.J. Azuaje, Venezuela

SESSION AC: ACTUATORS

Wednesday, September 2 10:45 - 12:15
Chair: Prof. Dr. J. L. Kirtley Jr.

A DSP Controlled Single Phase Linear Actuator for Positioning Application	260
Z.W. Shi, C.B. Rajanathan, A.T. Sapeluk, UK

Propulsion-and-Levitation Dynamics in a Land Travelling Marine-Express Model Train ME03 with Three Unbalanced-Mass Vehicles	264
K. Yoshida, H. Takami, D. Nakata, Japan

Study on Electromagnetic Damper Systems for the Superconducting Maglev Vehicle	270
H. Ohsaki, N. Tanahashi, N. Imai, E. Masada, Japan

Multi-Airgap Permanent Magnet Linear Actuator	276
L. Prevond, A. Ben Ahmed, J. Lucidarme, A. Lesobre, France

A Novel Planar Actuator	282
A.A. Suzim, A.F. Flores Filho, M.A. da Silveria, Brazil

SESSION IM2: INDUCTION MACHINES

Wednesday, September 2 13:45 - 15:15
Chair: Prof. Dr. G.-A. Capolino

Analysis of Electromagnetic Field in a Disk Induction Motor with Double-Sided Stator and Twin Rotors Using a 3-D Reluctance Network Method	286
K. Ciosk, E. Gierczak, E. Mendrela, Poland

Induction Motor Design Optimization	290
U. Sinha, J.L. Kirtley Jr., USA

Choosing the Main Dimensions of a Medium Speed (<30000 rpm) Solid-Rotor Induction Motor	296
J. Huppunen, J. Pyrhönen, Finland

Design of Energy Efficient Induction Motors Rotor End Using FEM	302
J. Haataja, J. Pyrhönen, Finland

Comparison of Induction Machine Park's Models Using Parameters Issue from FEM and from Experimental Tests	308
S. Brule, A. Tounzi, F. Piriou, France

Torque-Speed Characteristic of Elevator Deep Rotor Bar and Double Stator Winding Asynchronous Machines. Modelling and Measurement	314
J. Martinez-Roman, L. Serrano-Iribarnegaray, Spain

SESSION PM1: PERMANENT MAGNET MACHINES

Wednesday, September 2 13:45 - 15:15
Chair: Prof. Dr. M. A. Rahman

Validation of Procedure for Prediction of Field-Weakening Performance of Brushless Synchronous Machines	320
B.J. Chalmers, R. Akmeþe, L. Musaba, UK

The Performance of Brushless DC Motor with one Air-Gap Winding and Special Form of PM-Rotor	324
A.K. Daud, Palestine

Computation of Optimal Current Waveshape to Minimize Torque Ripple	329
S. Salon, T. Pham, USA, P. Lombard, France

Examinations of Torque Interruptions and Circulating Currents in PM Synchronous Motors with Switched Stator Windings	334
E. Nipp, Sweden

Claw Pole Geometries for High Performance Transverse Flux Machines	340
C.P. Maddison, B.C. Mecrow, A.G. Jack, UK

Permanent Magnet Machines with Soft Magnetic Composite Stators	346
B.C. Mecrow, A.G. Jack, S.A. Evans, UK

Comparison of Two Methods to Determine the d/q-axis Lumped Parameters of Permanent Magnet Machines with respect to Numerical Optimisation	352
U. Pahner, S. Van Haute, R. Belmans, K. Hameyer, Belgium

SESSION MI: MISCELLANEOUS TOPICS

Wednesday, September 2 13:45 - 15:15
Chair: Prof. Dr. S. P. Verma

International Standardization of Insulating Materials and Insulation Systems for Rotating Machines	358
H. Teichmann, Switzerland

Magnetic Shielding Effects Using Plural Bulk of High-Tc YBCO Superconductor	363
M. Gyoda, S. Torii, D. Ebihara, Japan

Modelling of an Electrically Actuated Vibratory System	369
D.J. Musgrave, D.A. Stone, C.M. Bingham, D. Howe, UK

Trial Manufacture and Fundamental Characteristics of a Model for Superconducting Rotary Transformer	375
Y. Hirane, S. Ohashi, S. Yokote, Japan

Distributed Variable Reluctance Sensors	381
A.M. Pawlak, USA

Single Phase Drive of Ultrasonic Motor for Reciprocating Motion	385
Y. Yamamoto, M. Nirei, Y. Kikuchi, I. Onozawa, Japan

A Comparison Between a Classical and an Optimised Variable Structure Control of a Shunt Active Filter	391
K. Sahnouni, O. Lapierre, A. Berthon, J.M. Kaufmann, France

SESSION PO2: POSTER SESSION

Wednesday, September 2 15:15 - 17:30

Diagnostics

Shaft Voltage Analysis: A New Generator Diagnostic Tool	396
M.J.E. Torlay, C. Corenwinder, J. Herigault, A. Audoli, A. Foggia, France

Increasing Bearing Elasticity and Damping Reduces the Rejection Rate of Electrical Motors on the Production Line	402
C. Öztürk, A. Bahadýr, Turkey, M.J. Brennan, UK

Recognition of Rotor Eccentricity of Induction Motors Based on the Fourier Spectra of Phase Currents	408
T.J. Sobczyk, K. Weinreb, A. Izworski, Poland

Unbalanced Induction Machine Simulation Dedicated to Condition Monitoring	414
E. Schaeffer, E. Lecarpentier, M.E. Zaim, France

Experimental Application of Axial Leakage Flux to the Detection of Rotor Asymmetries, Mechanical Anomalies and Interturn Shortcircuits in Working Induction Motors	420
M.F. Cabanas, M.G. Melero, G.A. Orcajo, F. Rodriguez Faya, J. Solares Sariego, Spain

A System for Global Protection Control and Diagnosis of Industrial Plants Including Electric Motors and Drives	426
G.A. Orcajo, M.G. Melero, M.F. Cabanas, J.M. Alvarez, L.A.R. Villalba, Spain

High Sensitive Rotor Cage Monitoring During Dynamic Load Operation the Vienna Monitoring Method	432
R.S. Wieser, C. Kral, F. Pirker, M. Schagginger, Austria

Useful Life of H.V. Induction Motors in Thermal Plants	438
C. Izquierdo, M. Burgos, M. Casal, P. Cruz, Spain

Modeling of the Three Phase Asynchronous Motor. Application to Magnetic Faults Diagnostic.	443
A. Ah-Jaco, A. Makki, H. Yahoui, G. Grellet, France

Current Pattern Analysis to Detect Induction Machine Non Rotational Anomalies	448
F.Filipetti, G. Franceschini, G. Gentile, S. Meo, A. Ometto, N. Rotondale, C Tassoni, Italy

Modelling of Induction Motor Rotor Faults with Finite Element Method	454
R. Fiser, D. Makuc, Slovenia

The Fault Detection of Asynchronous Motors Using Artificial Neural Network (ANN)	460
A. Onduk, C. Öz, Y. Uyaroðlu, N. Yumuþak, Turkey

Detection of Turn to Turn Short-Circuits in the Field Winding of Turbogenerators by the Measurement of the Air-Gap Flux Density	465
O. Drubel, M. Rist, K. Sedlazeck, Germany

Recent Developments in On-Line Motor Diagnostics	471
G.B. Kliman, W.J. Premerlani, B. Yazýcý, R.A. Koegl, USA

Noise and Vibration

A Digital Current Control Reducing Common Mode Emissions	476
M. Cacciato, A. Consoli, G. Scarcella, A. Testa, Italy

A Simple Solution on the Acoustic Noise Problems with the Frequency Spectrum Analyzing Method	482
O. Gergöz, O. Beydað, Turkey

A Contribution to the Study of Induction Machine Stator Resonance Frequencies	485
C. Couturier, B. Cassoret, France, P. Witczak, Poland, J.F. Brudny, France

Considerations for the Reduction of Vibrations and Noise in the Design of Induction Motors for Variable Frequency Operation	490
A. Balan, S.P. Verma, Canada

Electromechanical Analysis of Vibrations and Noise of Squirrel-Cage Induction Motors	496
L. Vandevelde, J.J.C. Gyselinck, J.A.A. Melkebeek, Belgium

Static Eccentricity as a Cause for Audible Noise of Induction Motors	502
K. Delaere, K. Hameyer, R. Belmans, Belgium

Air Gap and Vibration Monitoring of Synchronous Machines	507
G. Biechl, T. Oettli, K. Reichert, M.W. Marke, Switzerland

Transformers

Modal Oscillations of the Transformer Disk Coils	513
A. Moraru, F. Anghel, A. Marinescu, Romania

Monitoring of Two HV/MV Transformers and Extensive Tests on Two Distribution Transformers for the Determination of Their Overload Capability	516
A.N. Kartas, D.K. Tsanakas, Greece

Modelling and Simulation of a Welding Transformer for Parameters Evaluation	524
S.S. Cundeva, L.B. Petkovska, M.D. Cundev, Macedonia

Quasi-3D Method to Compute Magnetic Field and Losses in Anisotropic 3-phase Converter Transformer During Faults	529
E. Napieralska, France, R. Grzybowski, Poland

Design Issues of Integrated Transformers for Resistance Welding Robot Guns	535
S.Y. Guenov, G.N. Nachev, S.N. Guenov, Bulgaria

Artificial Intelligence Approaches to Distribution Transformer Core Quality Improvement	541
P.S. Georgilakis, N.D. Hatziargyriou, A.T. Souflaris, Greece

Very Fast Transient Overvoltages due to Discontinuity of Transformer Windings	547
G.B. Gharehpetian, H. Mohseni, Iran, K. Möller, Germany

Prediction of Po, Pk and Uk by Using Artificial Neural Network in the Manufacturing of Cast Resin Transformers	552
F. Temurtaþ, N. Yumuþak, O. Çerezci, Turkey

Interconnected Star Neutral Grounding Transformer with Mainly Ohmic Resistance	556
K. Lenasi, M. Berlec, Slovenia

Thermal Performance of a Current Transformer Using the Finite Element Approach	561
J.A. Dias Pinto, A.P. Coimbra, P.G. Pereirinha, C.F. Lemos Antunes, Portugal

The Accuracy of Transformer Thermal Time Constant and Final Temperature Rise Determination	565
M.J. Resende, Portugal, L. Pierrat, France, J. Santana, Portugal

Measurement and Computation of Mechanical Stress in the Windings of Power Transformer	571
D. Hristovski, K. Najdenkoski, Macedonia

Design and Test of 500 J Superconducting Pulsed Power Transformer	575
E. Floch, Y. Laumond, A. Lacaze, J.M. Kauffmann, P. Hiebel, France

TABLE OF CONTENTS

WEDNESDAY, SEPTEMBER 2, 1998

PLENARY SESSION

Wednesday, September 2 09:30 - 10:15
Chair: Prof. Dr. J. TEGOPOULOS

The Variable Speed Drives Market - Past, Present and a View on the Future	1
Dr. W. Drury, Control Techniques PLC, UK