Design of Synchronous Reluctance Machines for Automotive ...· iii ABSTRACT Design of Synchronous

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  • Design of Synchronous Reluctance Machines for Automotive Applications

    Seyedmorteza Taghavi

    A Thesis

    In the Department

    of

    Electrical and Computer Engineering

    Presented in Partial Fulfillment of the Requirements

    For the Degree of

    Doctor of Philosophy (Electrical and Computer Engineering) at

    Concordia University

    Montreal, Quebec, Canada

    March 2015

    © Seyedmorteza Taghavi, 2015

  • CONCORDIA UNIVERSITY

    SCHOOL OF GRADUATE STUDIES

    This is to certify that the thesis prepared

    By: Seyedmorteza Taghavi

    Entitled: Design of Synchronous Reluctance Machines for Automotive

    Applications

    and submitted in partial fulfillment of the requirements for the degree of

    Doctor of Philosophy (Electrical and Computer Engineering)

    complies with the regulations of the University and meets the accepted standards with

    respect to originality and quality.

    Signed by the final examining committee:

    ______________________________________________________Chair

    Dr. G. Gouw

    ______________________________________________________External Examiner

    Dr. A. M. Omekanda

    ______________________________________________________External to Program

    Dr. S. Rakheja

    ______________________________________________________Examiner

    Dr. S. Hashtrudi Zad

    ______________________________________________________Examiner

    Dr. L.A.C. Lopes

    ______________________________________________________Thesis Supervisor

    Dr. P. Pillay

    Approved by: ___________________________________________________

    Dr. A.R. Sebak, Graduate Program Director

    ___________________________________________

    March 24, 2015 Dr. A. Asif, Dean

    Faculty of Engineering & Computer Science

  • iii

    ABSTRACT

    Design of Synchronous Reluctance Machines for Automotive Applications

    Seyedmorteza Taghavi, Ph.D.

    Concordia University, 2015

    This dissertation reports an appropriate design methodology for synchronous reluctance

    machines, their important technical issues, and possible solutions for traction applications.

    The synchronous reluctance machines are used in industries owing to their unique merits

    such as high efficiency, fast dynamic response, and lower cost. Considering these superior

    properties, recently, this smart synchronous topology became more attractive for electrified

    powertrain applications in automotive industries. However, compared to the major

    requirements of the traction motors such as high torque and power density, low torque ripple,

    wide speed range, and proper size, this machine is still under investigations.

    The goals of this research work are first; to identify electrical, magnetic, and geometrical

    parameters which are dominant in the machine’s performance, and second; to verify

    appropriate design methodology for achieving a higher performance for automotive

    applications. Hence, analytical and computer aided analysis followed by experimental

    examinations on prototypes are carried out to support proposed methods and address possible

    solutions to the machine’s technical issues for these particular applications.

    Accordingly, the synchronous reluctance machine’s fundamental operations, electrical,

    magnetic, and geometrical parameters are investigated. Analytical approach and a sizing

    methodology corresponding to the desired specifications are presented through the machine’s

  • iv

    mathematical model. Design of transversal laminated anisotropic rotor structure with

    different geometries is studied to identify the geometrical parameters effects on the

    machine’s performance in particular the output torque and torque ripple. An appropriate

    geometrical method along with an innovative rotor lamination assembly are proposed for

    improving the machine’s output functions such as torque, power, and saliency ratio. Finally,

    the future perspective of the research work is discussed for further investigations.

  • v

    ACKNOWLEDGEMENTS

    My deep appreciation is first given to almighty God for blessing me with success in my

    efforts and blessing me with the erudition of several people whose advice, assistance and

    encouragement helped me throughout the completion of this thesis.

    I would like to express my heartfelt appreciation to my advisor, Professor Pragasen

    Pillay, for his support and continuous help. His knowledge, invaluable guidance,

    understanding and patience inspired the completion of this thesis. I am very grateful to work

    with such an insightful and caring professor.

    My sincere gratitude also goes to the members of my graduate study committee; Prof.

    Luiz Lopes, Prof. Shahin Hashtrudi Zad, and Prof. Subhash Rakheja for their valuable

    advice and help through my study.

    I would like to acknowledge the Department of Electrical and Computer Engineering at

    Concordia University for providing an excellent academic environment.

    Grateful acknowledgment is extended to the Natural Sciences & Engineering Research

    Council of Canada (NSERC), Hydro-Québec, Connect Canada, Auto21, and TM4 for their

    support for this research work.

    I would like to extend my sincere appreciation to my fellow colleagues and friends at

    Power Electronics and Energy Research (PEER) Group in P. D. Ziogas Machine and Power

    Electronics Laboratory, past and present, I honor their friendship and so many good

    memories.

  • vi

    I dedicate this work to the memory of my parents. I am very grateful and deeply indebted

    to them for their support and prayers that inspired me to be strong and succeeded.

    Last but certainly not the least; I do not have the words to express my gratitude to my

    beloved family, my wife Parisa and my daughter Taraneh for their patience, care and endless

    devotion. Paisa’s emotional support and priceless love during these years motivated me

    whenever I was exhausted, hopeless and tired of struggling with the obstacles in my study.

    No words can express my heartfelt gratitude to them for their endless love, care and

    sacrifices.

  • vii

    TABLE OF CONTENTS

    List of Figures .......................................................................................................................xi

    List of Tables …..………………………………………………………………………….xiv

    Nomenclature ……………………………………………………………….……………..xv

    List of Symbols ...…………………………………………………………………………xvi

    Chapter 1 Introduction .....................................................................................................1

    1.1 Research Background ...............................................................................................1

    1.2 Literature Survey on Electric Powertrains ...............................................................3

    Hybrid Electric Powertrain (HEV) ...................................................................4 1.2.1

    Electric Motor Drive Requirements for Traction System .................................7 1.2.2

    Possible Alternatives of the Electric Motor Drive for Traction ........................8 1.2.3

    DC Machine .............................................................................................11 1.2.3.1

    Induction Machine (IM) ..........................................................................12 1.2.3.2

    Permanent Magnet Synchronous Machine (PMSM) ...............................14 1.2.3.3

    Switched Reluctance Machine (SRM) ...................................................18 1.2.3.4

    Synchronous Reluctance Machine (SynRM) ..........................................20 1.2.3.5

    1.3 Selection of Motor Drive for Research Work ........................................................23

    Potential Issues of the SynRM as an Electric Powertrain ...............................26 1.3.1

    Sizing Method..........................................................................................26 1.3.1.1

    High Torque Ripple .................................................................................26 1.3.1.2

    Low Speed Range ....................................................................................27 1.3.1.3

    1.4 Research Objectives ...............................................................................................28

    1.5 Organization of this Thesis ....................................................................................29

    1.6 Contributions of this Thesis ...................................................................................30

    The Main Contribution of Chapter 3 ..............................................................30 1.6.1

    The Main Contributions of Chapter