Principles of Electric Drives
I.D. # WB0941 Duration 8 Hours
Electric drives are found in hybrid, plug-in hybrid, and hydrogen fuel cell vehicles, as well as battery electric vehicles. More than two million hybrid vehicles worldwide utilize electric drive components, and battery technology has matured enough to enable major manufacturers to develop light-duty and commercial electric vehicles for mass production and sale beginning in 2010-2012. It is also likely that many conventional vehicles will incorporate some form of idle-stop or stop-start system comprised of a low-output electric drive, as an integral part of efforts to meet U.S. CAFE fuel economy standards and EU CO2 emission requirements.

Industry professionals who are looking for a general understanding of the structure and components of vehicular electric drives will benefit from this course, which will cover theory, design, operation, and diagnostics of all major components used in electric drives (battery packs, inverters, motor-generators, DC-DC converters, and charging apparatus) as applied to all forms of vehicles, including charge- sustaining hybrids, plug-in hybrids, fuel cell hybrids, and battery electric vehicles. Battery chemistry, charging systems, power conversion, switching techniques, and traction motor construction will be discussed in detail.

Learning Objectives
By participating in this web seminar, you will be able to:

  • Explain the design, function, and interactions of all major components of a typical electric vehicle powertrain
  • Describe the operation, attributes, and behavior of battery packs, inverters, motor-generators, on- board and off-board charging systems, and DC-DC converters across all ranges of performance
  • Identify the different design configurations and requirements of electric drives in hybrids, plug-in hybrids, fuel cell hybrids, and battery electric vehicles
  • Classify different types of battery packs, inverters, motors, and DC-DC converters
  • Analyze the design and construction of a given electric powertrain, and evaluate its particular attributes and drawbacks
  • Assess fault detection and protection strategies and circuits as well as on-board diagnostic requirements
  • Appraise technical limitations of electric drive components, as well as design and technological trends that may address such limitations

Who Should Attend
Powertrain engineers, electrical engineers, project planners, project managers, technical writers, safety officers, component specialists, component suppliers, and anyone else who is professionally impacted by the development of electric vehicle technology will be able to use this information to help them transition to working with electric drives. Participants should have a basic knowledge of electric circuits. This is an introductory course; a mechanical or electrical engineering degree is helpful but not necessary.
Seminar Content
Session 1

Battery Packs, Capacitors, and Energy Management

  • Calculating Onboard Energy Storage Needs
  • Battery Chemistries and Lithium-Ion Sub-Chemistries
  • Electrolytic Double Layer Capacitors
  • Combination Systems (Hybrid Battery-Capacitor Systems)
  • Battery Pack Performance
  • Integrating an Energy Storage System into the Chassis
  • System Relays and Power-on Sequences
  • Battery Management Systems and Communication with the CAN Bus
  • Thermal Management Systems and Considerations
  • System Degradation
  • Onboard Charging Strategies
  • Failure and Diagnostic Modes
  • Recycling and Recovery of Battery Cell Material

  • Session 2

    External Charge-Discharge Systems and DC-DC Converters

    • Charging Systems for Electric Vehicles
    • Inductive and Conductive Charging
    • Charger-to-Vehicle Communication
    • Power Supply Considerations
    • Vehicle-to-Grid Systems
    • Switching Power Supplies and DC-DC Converters
    • Packing and Thermal Management of DC-DC Converters
    • Failure and Diagnostic Modes
    • Power Requirements of Drive-By-Wire Systems

    Session 3

    Inverters and Fundamentals of Power Electronics

    • Power Transistors And Switching Operation
    • Basic Motor Control
    • Producing AC Waves from a DC Supply
    • Capacitors in Inverters
    • Pulse-Width Modulation
    • PWM Inefficiencies
    • Overmodulation and Six-Step Control
    • Space-Vector Modulation
    • Boost Converters
    • Thermal Management of Inverters
    • Circuit Protection
    • Failure and Diagnostic Modes
    • Upcoming Power Electronics Developments and Enhancements

    Session 4

    Synchronous and Asynchronous Motor-Generators

    • Flux Linkages and Rotating Magnetic Fields
    • Rotor and Stator Construction
    • Torque Production, Motor-Generator Types

      • Permanent-Magnet
      • Induction
      • Reluctance
      • Enhanced Lundell Motor-Generators

    • Operation in Motor, Generator, and High-Speed Modes
    • Field-Weakening
    • Choosing a Motor-Generator, Thermal Management of Motor-Generators

  • EMF Considerations
  • Failure Modes and Diagnostic Strategies

  • Instructor(s): Jack Rosebro
    Jack RosebroJack Rosebro has taught hybrid, plug-in hybrid, and electric vehicle technology to a wide variety of automotive industry professionals for the past ten years. Since 2006, he has developed and delivered curriculum for Perfect Sky, Inc. throughout the US and Canada. He also consults to community colleges that are integrating hybrid and electric vehicle technology into their curricula. Jack writes about hybrid technology, regulatory issues, and sustainable mobility for Green Car Congress, and is a frequent speaker at industry conferences. Previously, Jack developed and taught courses on hybrid and electric vehicles, air/fuel systems, OBD-II self-diagnostic systems, and emission control systems. He received his M.Sc. in Engineering from Blekinge Institute of Technology in Sweden.

    *Global toll-free telephone numbers are provided for many countries outside the U.S., but are limited to those on the
    WebEx call-in toll-free number list. Check here to see
    if your country has a global call-in toll free telephone number for this web seminar. If your country is not listed, you may
    still connect using the US/Canada Call-in toll number or Voice over Internet Protocol (VoIP).

    Although WebEx Training Manager will automatically launch when you join the web seminar, you or your system administrator
    are encouraged to download the plug-in in advance to help ensure successful setup. Click here, then follow the onscreen instructions.

    NOTE: The course presentation will be recorded and made available for 30 days to those who register by the deadline.


    "Well done. I very much like the capability to download workbooks and recording for use offline (e.g. at the airport). Jack Rosebro has excellent background and insight into electric drive technology and takes great care to answer questions thoroughly."

    Kevin Walsh

    Staff Engineer

    Fisker Automotive Inc.

    "Very knowledgeable of the subject and very up to date."

    John B. Molesa

    Sales Engineer

    ebm-papst Automotive & Drives, Inc.

    Fees: $640 SAE Members*: $512 - $576
    * The appropriate SAE Member discount will be applied through the Registration process.  Discounts vary  according to level of membership: Elite Member 20%; Premium Member 15%; Classic Member 10%
    CEU .8